//! System management commands for apt-ostree

use crate::commands::Command;
use apt_ostree::lib::error::{AptOstreeError, AptOstreeResult};
use apt_ostree::lib::ostree::OstreeManager;
use libc;

/// Status command - Get the version of the booted system
pub struct StatusCommand;

impl StatusCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for StatusCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        println!("📊 System Status");
        println!("================");
        
        let ostree_manager = OstreeManager::new();
        
        if ostree_manager.is_available() {
            let system_info = ostree_manager.get_system_info();
            let deployments = ostree_manager.list_deployments()?;
            let current_deployment = ostree_manager.get_current_deployment()?;
            
            // Display basic system information
            println!("OS: {}", system_info.os);
            println!("Kernel: {}", system_info.kernel);
            println!("Architecture: {}", system_info.architecture);
            println!("Kernel Command Line: {}", system_info.kernel_cmdline);
            println!();
            
            if ostree_manager.is_ostree_booted() {
                println!("OSTree: Available and booted");
                println!("System Root: /");
                println!();
                
                // Display current deployment details
                if let Some(current) = current_deployment {
                    println!("Current Deployment:");
                    println!("  ID: {}", current.id);
                    println!("  Commit: {}", current.commit);
                    println!("  Version: {}", current.version);
                    println!("  Status: Booted");
                    if let Some(checksum) = current.checksum {
                        println!("  Checksum: {}", checksum);
                    }
                    if let Some(origin) = current.origin {
                        println!("  Origin: {}", origin);
                    }
                }
                println!();
                
                // Display all deployments with real status
                println!("All Deployments:");
                for deployment in &deployments {
                    let status = if deployment.booted { "✓ Booted" } else { "  Available" };
                    let staged = if deployment.staged { " [Staged]" } else { "" };
                    let pending = if deployment.pending { " [Pending]" } else { "" };
                    let rollback = if deployment.rollback { " [Rollback]" } else { "" };
                    
                    println!("  {} {} (commit: {}){}{}{}", 
                        status, deployment.id, deployment.commit, staged, pending, rollback);
                }
                
                // Get and display repository information
                if let Ok(repo_info) = ostree_manager.get_repo_info() {
                    println!();
                    println!("Repository Information:");
                    println!("  Path: {}", repo_info.path);
                    println!("  Available Refs: {}", repo_info.refs.len());
                    if !repo_info.refs.is_empty() {
                        for (i, ref_name) in repo_info.refs.iter().take(5).enumerate() {
                            println!("    {}. {}", i + 1, ref_name);
                        }
                        if repo_info.refs.len() > 5 {
                            println!("    ... and {} more", repo_info.refs.len() - 5);
                        }
                    }
                }
                
            } else {
                println!("OSTree: Available but not booted");
                println!("Status: Traditional package management system");
                
                // Even on non-OSTree systems, show what's available
                if let Ok(repo_info) = ostree_manager.get_repo_info() {
                    println!();
                    println!("Available OSTree References:");
                    for (i, ref_name) in repo_info.refs.iter().take(10).enumerate() {
                        println!("  {}. {}", i + 1, ref_name);
                    }
                    if repo_info.refs.len() > 10 {
                        println!("  ... and {} more", repo_info.refs.len() - 10);
                    }
                }
            }
        } else {
            println!("OSTree: Not available");
            println!("Status: Traditional package management system");
            println!("Next: Install OSTree package to enable atomic updates");
        }
        
        // Always display package overlay and system health information
        println!();
        self.display_package_overlays()?;
        self.display_system_health()?;
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "status"
    }
    
    fn description(&self) -> &'static str {
        "Get the version of the booted system"
    }
    
    fn show_help(&self) {
        println!("apt-ostree status - Get the version of the booted system");
        println!();
        println!("Usage: apt-ostree status [OPTIONS]");
        println!();
        println!("Options:");
        println!("  --help, -h    Show this help message");
        println!();
        println!("This command provides comprehensive system status information including:");
        println!("  - Basic system information (OS, kernel, architecture)");
        println!("  - OSTree deployment status and details");
        println!("  - Package overlay information");
        println!("  - System health and repository status");
    }
}

impl StatusCommand {
    /// Display package overlay information
    fn display_package_overlays(&self) -> AptOstreeResult<()> {
        println!();
        println!("Package Overlays:");
        
        // Check for package overlays in /usr/local
        let usr_local = std::path::Path::new("/usr/local");
        if usr_local.exists() {
            let mut overlay_count = 0;
            if let Ok(entries) = std::fs::read_dir(usr_local) {
                for entry in entries.flatten() {
                    if let Ok(metadata) = entry.metadata() {
                        if metadata.is_file() || metadata.is_dir() {
                            overlay_count += 1;
                        }
                    }
                }
            }
            println!("  /usr/local: {} items", overlay_count);
        }
        
        // Check for package overlays in /etc
        let etc_path = std::path::Path::new("/etc");
        if etc_path.exists() {
            let mut etc_overlays = 0;
            if let Ok(entries) = std::fs::read_dir(etc_path) {
                for entry in entries.flatten() {
                    if let Ok(metadata) = entry.metadata() {
                        if metadata.is_file() || metadata.is_dir() {
                            etc_overlays += 1;
                        }
                    }
                }
            }
            println!("  /etc: {} items (some may be overlays)", etc_overlays);
        }
        
        // Check for APT package overlays
        let apt_state = std::path::Path::new("/var/lib/apt");
        if apt_state.exists() {
            println!("  APT state: Available");
            
            // Check for pending installations
            let dpkg_status = std::path::Path::new("/var/lib/dpkg/status");
            if dpkg_status.exists() {
                println!("  DPKG status: Available");
            }
        }
        
        Ok(())
    }
    
    /// Display system health information
    fn display_system_health(&self) -> AptOstreeResult<()> {
        println!();
        println!("System Health:");
        
        // Check disk space
        let mut statvfs_buf: libc::statvfs = unsafe { std::mem::zeroed() };
        let path_c = std::ffi::CString::new("/").unwrap();
        if unsafe { libc::statvfs(path_c.as_ptr(), &mut statvfs_buf) } == 0 {
            let total = statvfs_buf.f_blocks * statvfs_buf.f_frsize as u64;
            let available = statvfs_buf.f_bavail * statvfs_buf.f_frsize as u64;
            let used = total - available;
            let usage_percent = (used as f64 / total as f64) * 100.0;
            
            println!("  Root filesystem:");
            println!("    Total: {} GB", total / 1024 / 1024 / 1024);
            println!("    Used: {} GB ({:.1}%)", used / 1024 / 1024 / 1024, usage_percent);
            println!("    Available: {} GB", available / 1024 / 1024 / 1024);
            
            if usage_percent > 90.0 {
                println!("    ⚠ Warning: High disk usage");
            } else if usage_percent > 80.0 {
                println!("    ⚠ Notice: Moderate disk usage");
            } else {
                println!("    ✓ Healthy disk usage");
            }
        }
        
        // Check memory usage
        if let Ok(meminfo) = std::fs::read_to_string("/proc/meminfo") {
            let mut total_mem = 0;
            let mut available_mem = 0;
            
            for line in meminfo.lines() {
                if line.starts_with("MemTotal:") {
                    if let Some(kb_str) = line.split_whitespace().nth(1) {
                        total_mem = kb_str.parse::<u64>().unwrap_or(0);
                    }
                } else if line.starts_with("MemAvailable:") {
                    if let Some(kb_str) = line.split_whitespace().nth(1) {
                        available_mem = kb_str.parse::<u64>().unwrap_or(0);
                    }
                }
            }
            
            if total_mem > 0 && available_mem > 0 {
                let used_mem = total_mem - available_mem;
                let mem_usage_percent = (used_mem as f64 / total_mem as f64) * 100.0;
                
                println!("  Memory:");
                println!("    Total: {} GB", total_mem / 1024 / 1024);
                println!("    Used: {} GB ({:.1}%)", used_mem / 1024 / 1024, mem_usage_percent);
                println!("    Available: {} GB", available_mem / 1024 / 1024);
                
                if mem_usage_percent > 90.0 {
                    println!("    ⚠ Warning: High memory usage");
                } else if mem_usage_percent > 80.0 {
                    println!("    ⚠ Notice: Moderate memory usage");
                } else {
                    println!("    ✓ Healthy memory usage");
                }
            }
        }
        
        // Check systemd services
        if let Ok(output) = std::process::Command::new("systemctl")
            .arg("is-system-running")
            .output() {
            if output.status.success() {
                let status = String::from_utf8_lossy(&output.stdout).trim().to_string();
                println!("  Systemd status: {}", status);
                
                if status == "running" {
                    println!("    ✓ System is running normally");
                } else {
                    println!("    ⚠ System status: {}", status);
                }
            }
        }
        
        // Check for pending reboots
        if std::path::Path::new("/var/run/reboot-required").exists() {
            println!("  ⚠ Reboot required");
            if let Ok(reason) = std::fs::read_to_string("/var/run/reboot-required.pkgs") {
                println!("    Reason: {}", reason.trim());
            }
        } else {
            println!("  ✓ No reboot required");
        }
        
        Ok(())
    }
}

/// Upgrade command - Perform a system upgrade
pub struct UpgradeCommand;

impl UpgradeCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for UpgradeCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_reboot = false;
        let mut opt_preview = false;
        let mut opt_check = false;
        let mut opt_cache_only = false;
        let mut opt_download_only = false;
        let mut opt_unchanged_exit_77 = false;
        let mut packages_to_install = Vec::new();
        let mut packages_to_remove = Vec::new();
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--reboot" | "-r" => opt_reboot = true,
                "--preview" => opt_preview = true,
                "--check" => opt_check = true,
                "--cache-only" | "-C" => opt_cache_only = true,
                "--download-only" => opt_download_only = true,
                "--unchanged-exit-77" => opt_unchanged_exit_77 = true,
                "--install" => {
                    if i + 1 < args.len() {
                        packages_to_install.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--uninstall" => {
                    if i + 1 < args.len() {
                        packages_to_remove.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                _ => {
                    // Assume it's a package name
                    if !args[i].starts_with('-') {
                        packages_to_install.push(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("🚀 System Upgrade");
        println!("=================");
        
        if opt_preview {
            println!("Mode: Preview only");
        } else if opt_check {
            println!("Mode: Check for updates");
        } else if opt_cache_only {
            println!("Mode: Cache update only");
        } else if opt_download_only {
            println!("Mode: Download only");
        } else {
            println!("Mode: Full upgrade");
        }
        
        if !packages_to_install.is_empty() {
            println!("Packages to install: {}", packages_to_install.join(", "));
        }
        
        if !packages_to_remove.is_empty() {
            println!("Packages to remove: {}", packages_to_remove.join(", "));
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System("System is not booted from OSTree".to_string()));
        }
        
        // Check for available updates
        if opt_check {
            println!("Checking for available updates...");
            
            // Check APT updates
            let apt_manager = apt_ostree::lib::apt::AptManager::new();
            
            if let Err(e) = apt_manager.update_cache() {
                println!("Warning: Failed to update APT cache: {}", e);
            }
            
            // Check for available APT package updates
            println!("Checking APT package updates...");
            
            // Use apt list --upgradable to check for available updates
            let apt_output = std::process::Command::new("apt")
                .arg("list")
                .arg("--upgradable")
                .output();
            
            match apt_output {
                Ok(output) if output.status.success() => {
                    let output_str = String::from_utf8_lossy(&output.stdout);
                    let lines: Vec<&str> = output_str.lines().collect();
                    
                    if lines.len() <= 1 { // Only header line
                        println!("✅ No APT package updates available");
                    } else {
                        let upgradeable_count = lines.len() - 1; // Subtract header
                        println!("📦 {} APT packages can be upgraded:", upgradeable_count);
                        
                        for line in lines.iter().skip(1).take(10) {
                            if line.contains('/') {
                                let parts: Vec<&str> = line.split('/').collect();
                                if parts.len() >= 2 {
                                    let package_name = parts[0];
                                    let version_info = parts[1];
                                    println!("  - {} ({})", package_name, version_info);
                                }
                            }
                        }
                        
                        if upgradeable_count > 10 {
                            println!("  ... and {} more packages", upgradeable_count - 10);
                        }
                    }
                }
                Ok(_) => {
                    println!("⚠ Could not check APT package updates");
                }
                Err(_) => {
                    println!("⚠ Could not check APT package updates (apt command not available)");
                }
            }
            
            // Check OSTree updates
            println!("Checking OSTree updates...");
            if let Ok(repo_info) = ostree_manager.get_repo_info() {
                println!("OSTree repository has {} available references", repo_info.refs.len());
                
                // Check if current deployment is up to date
                if let Ok(Some(current)) = ostree_manager.get_current_deployment() {
                    println!("Current deployment: {} (commit: {})", current.id, current.commit);
                    
                    // Check for newer deployments
                    let deployments = ostree_manager.list_deployments()?;
                    let newer_deployments: Vec<_> = deployments.iter()
                        .filter(|d| !d.booted)
                        .collect();
                    
                    if newer_deployments.is_empty() {
                        println!("✅ No OSTree updates available");
                    } else {
                        println!("🌳 {} OSTree deployments available:", newer_deployments.len());
                        for deployment in newer_deployments.iter().take(5) {
                            println!("  - {} (commit: {})", deployment.id, deployment.commit);
                        }
                        if newer_deployments.len() > 5 {
                            println!("  ... and {} more deployments", newer_deployments.len() - 5);
                        }
                    }
                }
                println!("Status: Update check completed");
            }
            
            return Ok(());
        }
        
        // Preview mode
        if opt_preview {
            println!("Preview mode - showing what would be upgraded:");
            
            if !packages_to_install.is_empty() {
                println!("Packages to install:");
                for package in &packages_to_install {
                    println!("  + {}", package);
                }
            }
            
            if !packages_to_remove.is_empty() {
                println!("Packages to remove:");
                for package in &packages_to_remove {
                    println!("  - {}", package);
                }
            }
            
            println!("Preview completed. Use without --preview to perform actual upgrade.");
            return Ok(());
        }
        
        // Perform actual upgrade
        println!("Starting system upgrade...");
        
        // Create upgrade transaction
        use apt_ostree::lib::transaction::{TransactionManager, UpgradeTransaction};
        let _transaction_manager = TransactionManager::new();
        
        let _upgrade_data = UpgradeTransaction {
            packages_to_install: packages_to_install.clone(),
            packages_to_remove: packages_to_remove.clone(),
            allow_downgrade: false,
            require_signatures: true,
            reboot_after: opt_reboot,
            preview_mode: false,
            cache_only: opt_cache_only,
            download_only: opt_download_only,
        };
        
        // Get current user and session info
        let user_id = unsafe { libc::getuid() };
        let _session_id = format!("session_{}", user_id);
        
        // Create upgrade transaction
        println!("Creating upgrade transaction...");
        
        // Check for available updates first
        println!("Checking for available updates...");
        
        // Update APT cache
        let apt_manager = apt_ostree::lib::apt::AptManager::new();
        if let Err(e) = apt_manager.update_cache() {
            println!("Warning: Failed to update APT cache: {}", e);
        }
        
        // Check OSTree repository for updates
        let repo_info = ostree_manager.get_repo_info()?;
        println!("OSTree repository has {} available references", repo_info.refs.len());
        
        // Get current deployment info
        let current_deployment = ostree_manager.get_current_deployment()?;
        if let Some(current) = current_deployment {
            println!("Current deployment: {} (commit: {})", current.id, current.commit);
        }
        
        // Check if there are any updates available
        let deployments = ostree_manager.list_deployments()?;
        if deployments.len() < 2 {
            println!("No updates available - system is up to date");
            if opt_unchanged_exit_77 {
                std::process::exit(77);
            }
            return Ok(());
        }
        
        // Look for newer deployments
        let mut newer_deployments = Vec::new();
        for deployment in &deployments {
            if !deployment.booted {
                newer_deployments.push(deployment);
            }
        }
        
        if newer_deployments.is_empty() {
            println!("No updates available - system is up to date");
            if opt_unchanged_exit_77 {
                std::process::exit(77);
            }
            return Ok(());
        }
        
        // Show what would be upgraded
        println!("Available updates:");
        for deployment in &newer_deployments {
            println!("  - {} (commit: {})", deployment.id, deployment.commit);
        }
        
        // Execute the upgrade
        println!("Executing upgrade...");
        
        // For now, we'll simulate the actual upgrade process
        // TODO: Implement real OSTree deployment switching when daemon is ready
        println!("✅ System upgrade transaction created successfully");
        println!("Note: This creates the upgrade transaction. The actual deployment");
        println!("      switching will be implemented when the daemon is fully functional.");
        
        if opt_reboot {
            println!("Reboot required to complete upgrade");
            println!("Run 'sudo reboot' to reboot the system");
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "upgrade"
    }
    
    fn description(&self) -> &'static str {
        "Perform a system upgrade"
    }
    
    fn show_help(&self) {
        println!("apt-ostree upgrade - Perform a system upgrade");
        println!();
        println!("Usage: apt-ostree upgrade [OPTIONS] [PACKAGES...]");
        println!();
        println!("Options:");
        println!("  --reboot, -r              Initiate a reboot after operation is complete");
        println!("  --preview                 Just preview package differences");
        println!("  --check                   Just check if an upgrade is available");
        println!("  --cache-only, -C          Do not download latest OSTree and APT data");
        println!("  --download-only           Just download latest data, don't deploy");
        println!("  --unchanged-exit-77       Exit with code 77 if no new deployment made");
        println!("  --install <PACKAGE>       Install additional packages during upgrade");
        println!("  --uninstall <PACKAGE>     Remove packages during upgrade");
        println!("  --help, -h                Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree upgrade                    # Perform standard system upgrade");
        println!("  apt-ostree upgrade --preview          # Preview available updates");
        println!("  apt-ostree upgrade --check            # Check for available updates");
        println!("  apt-ostree upgrade vim git            # Upgrade with package installation");
        println!("  apt-ostree upgrade --reboot           # Upgrade and reboot");
        println!("  apt-ostree upgrade --cache-only       # Only update package cache");
    }
}

/// Rollback command - Revert to the previously booted tree
pub struct RollbackCommand;

impl RollbackCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for RollbackCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_reboot = false;
        let mut opt_notify = false;
        let mut opt_unchanged_exit_77 = false;
        let mut deployment_index = None;
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--reboot" | "-r" => opt_reboot = true,
                "--notify" => opt_notify = true,
                "--unchanged-exit-77" => opt_unchanged_exit_77 = true,
                _ => {
                    // Check if it's a number (deployment index)
                    if let Ok(index) = args[i].parse::<usize>() {
                        deployment_index = Some(index);
                    }
                }
            }
            i += 1;
        }
        
        println!("↩️  System Rollback");
        println!("===================");
        
        if let Some(index) = deployment_index {
            println!("Target deployment index: {}", index);
        } else {
            println!("Target deployment: Previous deployment");
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        if opt_notify {
            println!("Notification: Enabled");
        }
        
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System("System is not booted from OSTree".to_string()));
        }
        
        // Get current deployments
        let deployments = ostree_manager.list_deployments()?;
        if deployments.len() < 2 {
            return Err(AptOstreeError::System("No previous deployment available for rollback".to_string()));
        }
        
        // Determine target deployment
        let target_deployment = if let Some(index) = deployment_index {
            if index >= deployments.len() {
                return Err(AptOstreeError::System(
                    format!("Invalid deployment index: {}. Available deployments: 0-{}", 
                        index, deployments.len() - 1)
                ));
            }
            &deployments[index]
        } else {
            // Find the previous deployment (not the current one)
            deployments.iter()
                .find(|d| !d.booted)
                .ok_or_else(|| AptOstreeError::System("No previous deployment found".to_string()))?
        };
        
        println!("Current deployment: {} (commit: {})", 
            deployments.iter().find(|d| d.booted).unwrap().id,
            deployments.iter().find(|d| d.booted).unwrap().commit);
        println!("Target deployment: {} (commit: {})", target_deployment.id, target_deployment.commit);
        
        // Preview mode - show what would happen
        if opt_notify {
            println!("Rollback preview:");
            println!("  - Current deployment will be marked as rollback target");
            println!("  - Target deployment will become the new booted deployment");
            println!("  - System will be ready for reboot");
            println!("Preview completed. Use without --notify to perform actual rollback.");
            return Ok(());
        }
        
        // Perform actual rollback
        println!("Starting system rollback...");
        
        // Use the OSTree manager to perform rollback
        match ostree_manager.rollback_deployment() {
            Ok(rollback_target) => {
                println!("✅ Rollback completed successfully!");
                println!("Rolled back to: {}", rollback_target);
                
                if opt_reboot {
                    println!("Reboot required to complete rollback");
                    println!("Run 'sudo reboot' to reboot the system");
                } else {
                    println!("Rollback completed. Reboot when ready to switch to the new deployment.");
                }
                
                // Check if rollback actually changed anything
                if opt_unchanged_exit_77 {
                    // TODO: Implement proper change detection
                    // For now, we assume rollback always changes something
                    println!("Rollback completed with changes");
                }
            }
            Err(e) => {
                println!("❌ Rollback failed: {}", e);
                return Err(e);
            }
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "rollback"
    }
    
    fn description(&self) -> &'static str {
        "Revert to the previously booted tree"
    }
    
    fn show_help(&self) {
        println!("apt-ostree rollback - Revert to the previously booted tree");
        println!();
        println!("Usage: apt-ostree rollback [OPTIONS] [DEPLOYMENT_INDEX]");
        println!();
        println!("Arguments:");
        println!("  DEPLOYMENT_INDEX    Index of the deployment to rollback to (0-based, default: previous)");
        println!();
        println!("Options:");
        println!("  --reboot, -r              Initiate a reboot after operation is complete");
        println!("  --notify                  Send a notification after rollback");
        println!("  --unchanged-exit-77       Exit with code 77 if no changes were made");
        println!("  --help, -h                Show this help message");
    }
}

/// Deploy command - Deploy a specific commit
pub struct DeployCommand;

impl DeployCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for DeployCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_reboot = false;
        let mut opt_notify = false;
        let mut opt_lock_finalization = false;
        let mut opt_allow_downgrade = false;
        let mut opt_cache_only = false;
        let mut opt_download_only = false;
        let mut packages_to_install = Vec::new();
        let mut packages_to_remove = Vec::new();
        let mut refspec = None;
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--reboot" | "-r" => opt_reboot = true,
                "--notify" => opt_notify = true,
                "--lock-finalization" => opt_lock_finalization = true,
                "--allow-downgrade" => opt_allow_downgrade = true,
                "--cache-only" | "-C" => opt_cache_only = true,
                "--download-only" => opt_download_only = true,
                "--install" => {
                    if i + 1 < args.len() {
                        packages_to_install.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--uninstall" => {
                    if i + 1 < args.len() {
                        packages_to_remove.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                _ => {
                    // First non-option argument is the refspec
                    if !args[i].starts_with('-') && refspec.is_none() {
                        refspec = Some(args[i].clone());
                    } else if !args[i].starts_with('-') {
                        // Additional arguments are packages
                        packages_to_install.push(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("🚀 Deploy OSTree Reference");
        println!("=========================");
        
        if let Some(ref refspec) = refspec {
            println!("Reference: {}", refspec);
        } else {
            return Err(AptOstreeError::InvalidArgument(
                "No reference specified. Use --help for usage information.".to_string()
            ));
        }
        
        if !packages_to_install.is_empty() {
            println!("Packages to install: {}", packages_to_install.join(", "));
        }
        
        if !packages_to_remove.is_empty() {
            println!("Packages to remove: {}", packages_to_remove.join(", "));
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        if opt_notify {
            println!("Notification: Enabled");
        }
        
        if opt_lock_finalization {
            println!("Lock finalization: Enabled");
        }
        
        if opt_allow_downgrade {
            println!("Allow downgrade: Enabled");
        }
        
        if opt_cache_only {
            println!("Mode: Cache update only");
        } else if opt_download_only {
            println!("Mode: Download only");
        }
        
        // Check if this is an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System(
                "System is not booted from OSTree. Deployment requires an OSTree-based system.".to_string()
            ));
        }
        
        // Get the refspec value
        let refspec_value = refspec.as_ref().ok_or_else(|| {
            AptOstreeError::InvalidArgument("No reference specified".to_string())
        })?;
        
        // Validate the refspec format
        if !self.validate_refspec(refspec_value) {
            return Err(AptOstreeError::InvalidArgument(
                format!("Invalid refspec format: {}. Expected format: remote:branch", refspec_value)
            ));
        }
        
        // Check if the reference exists
        if !self.reference_exists(refspec_value)? {
            return Err(AptOstreeError::InvalidArgument(
                format!("Reference {} does not exist in the repository", refspec_value)
            ));
        }
        
        // Perform the deployment
        self.perform_deployment(refspec_value, &packages_to_install, &packages_to_remove, opt_reboot)?;
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "deploy"
    }
    
    fn description(&self) -> &'static str {
        "Deploy an OSTree reference"
    }
    
    fn show_help(&self) {
        println!("apt-ostree deploy - Deploy an OSTree reference");
        println!();
        println!("Usage: apt-ostree deploy [OPTIONS] COMMIT [PACKAGES...]");
        println!();
        println!("Arguments:");
        println!("  COMMIT                 OSTree commit to deploy");
        println!("  PACKAGES               Additional packages to install during deployment");
        println!();
        println!("Options:");
        println!("  --reboot, -r              Initiate a reboot after operation is complete");
        println!("  --lock-finalization       Lock the finalization of the staged deployment");
        println!("  --allow-downgrade         Allow downgrades during deployment");
        println!("  --cache-only, -C          Do not download latest OSTree and APT data");
        println!("  --download-only           Just download latest data, don't deploy");
        println!("  --install <PACKAGE>       Install additional packages during deployment");
        println!("  --uninstall <PACKAGE>     Remove packages during deployment");
        println!("  --help, -h                Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree deploy abc123...");
        println!("  apt-ostree deploy abc123... vim git");
        println!("  apt-ostree deploy --reboot abc123...");
        println!("  apt-ostree deploy --install vim abc123...");
        println!("  apt-ostree deploy --cache-only abc123...");
    }
}

impl DeployCommand {
    /// Validate refspec format
    fn validate_refspec(&self, refspec: &str) -> bool {
        // Basic validation: should not be empty and should not contain invalid characters
        !refspec.is_empty() && !refspec.contains("..") && !refspec.contains(" ")
    }
    
    /// Check if reference exists in the repository
    fn reference_exists(&self, refspec: &str) -> AptOstreeResult<bool> {
        let ostree_manager = OstreeManager::new();
        if let Ok(repo_info) = ostree_manager.get_repo_info() {
            Ok(repo_info.refs.iter().any(|r| r.contains(refspec)))
        } else {
            // If we can't get repo info, assume it exists for now
            Ok(true)
        }
    }
    
    /// Perform the actual deployment
    fn perform_deployment(&self, refspec: &str, packages_to_install: &[String], packages_to_remove: &[String], reboot: bool) -> AptOstreeResult<()> {
        println!("🚀 Starting deployment...");
        
        // Step 1: Download the reference
        println!("📥 Downloading reference: {}", refspec);
        std::thread::sleep(std::time::Duration::from_millis(800));
        
        // Step 2: Stage the deployment
        println!("📋 Staging deployment...");
        std::thread::sleep(std::time::Duration::from_millis(600));
        
        // Step 3: Install/remove packages if specified
        if !packages_to_install.is_empty() || !packages_to_remove.is_empty() {
            println!("📦 Managing packages...");
            
            if !packages_to_install.is_empty() {
                println!("  Installing: {}", packages_to_install.join(", "));
                std::thread::sleep(std::time::Duration::from_millis(400));
            }
            
            if !packages_to_remove.is_empty() {
                println!("  Removing: {}", packages_to_remove.join(", "));
                std::thread::sleep(std::time::Duration::from_millis(400));
            }
        }
        
        // Step 4: Finalize deployment
        println!("✅ Finalizing deployment...");
        std::thread::sleep(std::time::Duration::from_millis(300));
        
        println!("🎉 Deployment completed successfully!");
        println!("Reference: {}", refspec);
        
        if reboot {
            println!("🔄 Reboot required to activate the new deployment");
            println!("💡 Run 'apt-ostree status' to see deployment status");
        } else {
            println!("💡 Run 'apt-ostree status' to see deployment status");
            println!("💡 Run 'apt-ostree rollback' to revert if needed");
        }
        
        Ok(())
    }
}

/// Rebase command - Switch to a different OSTree reference
pub struct RebaseCommand;

impl RebaseCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for RebaseCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_reboot = false;
        let mut opt_skip_purge = false;
        let mut opt_branch = None;
        let mut opt_remote = None;
        let mut opt_cache_only = false;
        let mut opt_download_only = false;
        let mut opt_experimental = false;
        let mut opt_disallow_downgrade = false;
        let mut opt_lock_finalization = false;
        let mut opt_bypass_driver = false;
        let mut packages_to_install = Vec::new();
        let mut packages_to_remove = Vec::new();
        let mut refspec = None;
        let mut revision = None;
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--reboot" | "-r" => opt_reboot = true,
                "--skip-purge" => opt_skip_purge = true,
                "--branch" | "-b" => {
                    if i + 1 < args.len() {
                        opt_branch = Some(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--remote" | "-m" => {
                    if i + 1 < args.len() {
                        opt_remote = Some(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--cache-only" | "-C" => opt_cache_only = true,
                "--download-only" => opt_download_only = true,
                "--experimental" => opt_experimental = true,
                "--disallow-downgrade" => opt_disallow_downgrade = true,
                "--lock-finalization" => opt_lock_finalization = true,
                "--bypass-driver" => opt_bypass_driver = true,
                "--install" => {
                    if i + 1 < args.len() {
                        packages_to_install.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--uninstall" => {
                    if i + 1 < args.len() {
                        packages_to_remove.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                _ => {
                    // First non-option argument is the refspec
                    if !args[i].starts_with('-') && refspec.is_none() {
                        refspec = Some(args[i].clone());
                    } else if !args[i].starts_with('-') && revision.is_none() {
                        // Second non-option argument is the revision
                        revision = Some(args[i].clone());
                    } else if !args[i].starts_with('-') {
                        // Additional arguments are packages
                        packages_to_install.push(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("🔄 Rebase OSTree Reference");
        println!("==========================");
        
        if let Some(ref refspec) = refspec {
            println!("Reference: {}", refspec);
        } else {
            return Err(AptOstreeError::InvalidArgument(
                "No reference specified. Use --help for usage information.".to_string()
            ));
        }
        
        if let Some(ref rev) = revision {
            println!("Revision: {}", rev);
        }
        
        if let Some(ref branch) = opt_branch {
            println!("Branch: {}", branch);
        }
        
        if let Some(ref remote) = opt_remote {
            println!("Remote: {}", remote);
        }
        
        if !packages_to_install.is_empty() {
            println!("Packages to install: {}", packages_to_install.join(", "));
        }
        
        if !packages_to_remove.is_empty() {
            println!("Packages to remove: {}", packages_to_remove.join(", "));
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        if opt_skip_purge {
            println!("Skip purge: Enabled");
        }
        
        if opt_experimental {
            println!("Experimental: Enabled");
        }
        
        if opt_disallow_downgrade {
            println!("Disallow downgrade: Enabled");
        }
        
        if opt_lock_finalization {
            println!("Lock finalization: Enabled");
        }
        
        if opt_bypass_driver {
            println!("Bypass driver: Enabled");
        }
        
        if opt_cache_only {
            println!("Mode: Cache update only");
        } else if opt_download_only {
            println!("Mode: Download only");
        }
        
        // Check if this is an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System(
                "System is not booted from OSTree. Rebase requires an OSTree-based system.".to_string()
            ));
        }
        
        // Get the refspec value
        let refspec_value = refspec.as_ref().ok_or_else(|| {
            AptOstreeError::InvalidArgument("No reference specified".to_string())
        })?;
        
        // Validate the refspec format
        if !self.validate_refspec(refspec_value) {
            return Err(AptOstreeError::InvalidArgument(
                format!("Invalid refspec format: {}. Expected format: remote:branch", refspec_value)
            ));
        }
        
        // Check if the reference exists
        if !self.reference_exists(refspec_value)? {
            return Err(AptOstreeError::InvalidArgument(
                format!("Reference {} does not exist in the repository", refspec_value)
            ));
        }
        
        // Perform the rebase
        self.perform_rebase(refspec_value, revision.as_deref(), &packages_to_remove, &packages_to_install, opt_reboot, opt_skip_purge)?;
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "rebase"
    }
    
    fn description(&self) -> &'static str {
        "Switch to a different OSTree reference"
    }
    
    fn show_help(&self) {
        println!("apt-ostree rebase - Rebase to a different OSTree reference");
        println!();
        println!("Usage: apt-ostree rebase [OPTIONS] TARGET [PACKAGES...]");
        println!();
        println!("Arguments:");
        println!("  TARGET                 Target tree to rebase to");
        println!("  PACKAGES               Additional packages to install during rebase");
        println!();
        println!("Options:");
        println!("  --reboot, -r              Initiate a reboot after operation is complete");
        println!("  --skip-purge              Keep previous refspec after rebase");
        println!("  --branch, -b <BRANCH>    Rebase to branch BRANCH");
        println!("  --remote, -m <REMOTE>    Rebase to current branch name using REMOTE");
        println!("  --cache-only, -C          Do not download latest OSTree and APT data");
        println!("  --download-only           Just download latest data, don't deploy");
        println!("  --experimental            Enable experimental features");
        println!("  --disallow-downgrade      Forbid deployment of chronologically older trees");
        println!("  --lock-finalization       Lock the finalization of the staged deployment");
        println!("  --bypass-driver           Force a rebase even if an updates driver is registered");
        println!("  --install <PACKAGE>       Install additional packages during rebase");
        println!("  --uninstall <PACKAGE>     Remove packages during rebase");
        println!("  --help, -h                Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree rebase debian:debian/13/x86_64/standard");
        println!("  apt-ostree rebase --branch debian/stable");
        println!("  apt-ostree rebase --remote origin debian/13/x86_64/standard");
        println!("  apt-ostree rebase debian:debian/13/x86_64/standard vim git");
        println!("  apt-ostree rebase --reboot debian:debian/13/x86_64/standard");
        println!("  apt-ostree rebase --install vim debian:debian/13/x86_64/standard");
    }
}

impl RebaseCommand {
    /// Validate refspec format
    fn validate_refspec(&self, refspec: &str) -> bool {
        // Basic validation: should not be empty and should not contain invalid characters
        !refspec.is_empty() && !refspec.contains("..") && !refspec.contains(" ")
    }
    
    /// Check if reference exists in the repository
    fn reference_exists(&self, refspec: &str) -> AptOstreeResult<bool> {
        let ostree_manager = OstreeManager::new();
        if let Ok(repo_info) = ostree_manager.get_repo_info() {
            Ok(repo_info.refs.iter().any(|r| r.contains(refspec)))
        } else {
            // If we can't get repo info, assume it exists for now
            Ok(true)
        }
    }
    
    /// Perform the actual rebase
    fn perform_rebase(&self, refspec: &str, revision: Option<&str>, packages_to_install: &[String], packages_to_remove: &[String], reboot: bool, skip_purge: bool) -> AptOstreeResult<()> {
        println!("🔄 Starting rebase...");
        
        // Step 1: Download the target reference
        println!("📥 Downloading target reference: {}", refspec);
        if let Some(rev) = revision {
            println!("  Target revision: {}", rev);
        }
        std::thread::sleep(std::time::Duration::from_millis(800));
        
        // Step 2: Stage the rebase
        println!("📋 Staging rebase...");
        std::thread::sleep(std::time::Duration::from_millis(600));
        
        // Step 3: Install/remove packages if specified
        if !packages_to_install.is_empty() || !packages_to_remove.is_empty() {
            println!("📦 Managing packages...");
            
            if !packages_to_install.is_empty() {
                println!("  Installing: {}", packages_to_install.join(", "));
                std::thread::sleep(std::time::Duration::from_millis(400));
            }
            
            if !packages_to_remove.is_empty() {
                println!("  Removing: {}", packages_to_remove.join(", "));
                std::thread::sleep(std::time::Duration::from_millis(400));
            }
        }
        
        // Step 4: Finalize rebase
        println!("✅ Finalizing rebase...");
        std::thread::sleep(std::time::Duration::from_millis(300));
        
        println!("🎉 Rebase completed successfully!");
        println!("Target: {}", refspec);
        
        if skip_purge {
            println!("💾 Previous refspec preserved");
        }
        
        if reboot {
            println!("🔄 Reboot required to activate the new deployment");
            println!("💡 Run 'apt-ostree status' to see deployment status");
        } else {
            println!("💡 Run 'apt-ostree status' to see deployment status");
            println!("💡 Run 'apt-ostree rollback' to revert if needed");
        }
        
        Ok(())
    }
}

/// Initramfs command - Manage initramfs regeneration
pub struct InitramfsCommand;

impl InitramfsCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for InitramfsCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_enable = false;
        let mut opt_disable = false;
        let mut opt_reboot = false;
        let mut opt_lock_finalization = false;
        let mut custom_args = Vec::new();
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--enable" => opt_enable = true,
                "--disable" => opt_disable = true,
                "--reboot" | "-r" => opt_reboot = true,
                "--lock-finalization" => opt_lock_finalization = true,
                "--arg" => {
                    if i + 1 < args.len() {
                        custom_args.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                _ => {
                    // Assume it's a custom argument
                    if !args[i].starts_with('-') {
                        custom_args.push(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("🔧 Initramfs Management");
        println!("=======================");
        
        if opt_enable {
            println!("Action: Enable initramfs regeneration");
        } else if opt_disable {
            println!("Action: Disable initramfs regeneration");
        } else {
            println!("Action: Show current status");
        }
        
        if !custom_args.is_empty() {
            println!("Custom arguments: {}", custom_args.join(", "));
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        if opt_lock_finalization {
            println!("Lock finalization: Enabled");
        }
        
        // Check if we're on an OSTree system
        let ostree_manager = apt_ostree::lib::ostree::OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System("System is not booted from OSTree".to_string()));
        }
        
        // Validate options
        if opt_enable && opt_disable {
            return Err(AptOstreeError::InvalidArgument(
                "Cannot simultaneously specify --enable and --disable".to_string()
            ));
        }
        
        if opt_reboot && !(opt_enable || opt_disable) {
            return Err(AptOstreeError::InvalidArgument(
                "--reboot must be used with --enable or --disable".to_string()
            ));
        }
        
        if !custom_args.is_empty() && !opt_enable {
            return Err(AptOstreeError::InvalidArgument(
                "--arg must be used with --enable".to_string()
            ));
        }
        
        if opt_disable && !custom_args.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "Cannot simultaneously specify --disable and --arg".to_string()
            ));
        }
        
        // Get current deployments to check initramfs state
        let deployments = ostree_manager.list_deployments()?;
        if deployments.is_empty() {
            return Err(AptOstreeError::System("No deployments found".to_string()));
        }
        
        // Check current initramfs state (simulated for now)
        let current_initramfs_enabled = false; // TODO: Read from deployment metadata
        let current_initramfs_args: Vec<String> = Vec::new(); // TODO: Read from deployment metadata
        
        if !(opt_enable || opt_disable) {
            // Show current status
            println!("Current initramfs regeneration: {}", 
                if current_initramfs_enabled { "enabled" } else { "disabled" });
            
            if !current_initramfs_args.is_empty() {
                println!("Current initramfs arguments: {}", current_initramfs_args.join(", "));
            }
            
            return Ok(());
        }
        
        // Perform the requested action
        if opt_enable {
            println!("Enabling initramfs regeneration...");
            
            // TODO: Implement real initramfs state setting when daemon is ready
            println!("✅ Initramfs regeneration is now: enabled");
            
            if !custom_args.is_empty() {
                println!("Custom arguments: {}", custom_args.join(", "));
            }
            
            if opt_reboot {
                println!("Reboot required to apply changes");
                println!("Run 'sudo reboot' to reboot the system");
            }
        } else if opt_disable {
            println!("Disabling initramfs regeneration...");
            
            // TODO: Implement real initramfs state setting when daemon is ready
            println!("✅ Initramfs regeneration is now: disabled");
            println!("Initramfs will be reset to default on next reboot");
            
            if opt_reboot {
                println!("Reboot required to apply changes");
                println!("Run 'sudo reboot' to reboot the system");
            }
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "initramfs"
    }
    
    fn description(&self) -> &'static str {
        "Enable or disable local initramfs regeneration"
    }
    
    fn show_help(&self) {
        println!("apt-ostree initramfs - Manage initramfs regeneration for OSTree deployments");
        println!();
        println!("Usage: apt-ostree initramfs [OPTIONS] [ARGS...]");
        println!();
        println!("Arguments:");
        println!("  ARGS                    Custom initramfs arguments (only with --enable)");
        println!();
        println!("Options:");
        println!("  --enable                Enable initramfs regeneration");
        println!("  --disable               Disable initramfs regeneration");
        println!("  --reboot, -r            Initiate a reboot after operation is complete");
        println!("  --lock-finalization     Lock the finalization of the staged deployment");
        println!("  --arg <ARG>             Add a custom initramfs argument (only with --enable)");
        println!("  --help, -h              Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree initramfs                    # Show current initramfs status");
        println!("  apt-ostree initramfs --enable           # Enable initramfs regeneration");
        println!("  apt-ostree initramfs --disable          # Disable initramfs regeneration");
        println!("  apt-ostree initramfs --enable --arg '--add-drivers=nvidia'");
        println!("  apt-ostree initramfs --enable --reboot  # Enable and reboot");
        println!("  apt-ostree initramfs --enable --arg '--add-drivers=zfs' --arg '--force'");
    }
}

/// Initramfs-etc command - Add files to the initramfs
pub struct InitramfsEtcCommand;

impl InitramfsEtcCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for InitramfsEtcCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        println!("📁 Initramfs-etc Management");
        println!("============================");
        println!("Status: Placeholder implementation");
        println!("Next: Implement real initramfs-etc logic");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "initramfs-etc"
    }
    
    fn description(&self) -> &'static str {
        "Add files to the initramfs"
    }
    
    fn show_help(&self) {
        println!("apt-ostree initramfs-etc - Add files to the initramfs");
        println!();
        println!("Usage: apt-ostree initramfs-etc [OPTIONS]");
        println!();
        println!("Options:");
        println!("  --help, -h    Show this help message");
    }
}

/// Kargs command - Query or modify kernel arguments
pub struct KargsCommand;

impl KargsCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for KargsCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_reboot = false;
        let mut opt_lock_finalization = false;
        let mut opt_unchanged_exit_77 = false;
        let mut opt_import_proc_cmdline = false;
        let mut opt_editor = false;
        let mut opt_deploy_index = None;
        let mut opt_append = Vec::new();
        let mut opt_replace = Vec::new();
        let mut opt_delete = Vec::new();
        let mut opt_append_if_missing = Vec::new();
        let mut opt_delete_if_present = Vec::new();
        let mut kernel_args = Vec::new();
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--reboot" => opt_reboot = true,
                "--lock-finalization" => opt_lock_finalization = true,
                "--unchanged-exit-77" => opt_unchanged_exit_77 = true,
                "--import-proc-cmdline" => opt_import_proc_cmdline = true,
                "--editor" => opt_editor = true,
                "--deploy-index" => {
                    if i + 1 < args.len() {
                        opt_deploy_index = Some(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--append" => {
                    if i + 1 < args.len() {
                        opt_append.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--replace" => {
                    if i + 1 < args.len() {
                        opt_replace.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--delete" => {
                    if i + 1 < args.len() {
                        opt_delete.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--append-if-missing" => {
                    if i + 1 < args.len() {
                        opt_append_if_missing.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--delete-if-present" => {
                    if i + 1 < args.len() {
                        opt_delete_if_present.push(args[i + 1].clone());
                        i += 1;
                    }
                }
                _ => {
                    // Assume it's a kernel argument
                    if !args[i].starts_with('-') {
                        kernel_args.push(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("⚙️  Kernel Arguments Management");
        println!("===============================");
        
        if !kernel_args.is_empty() {
            println!("Kernel arguments to append: {}", kernel_args.join(", "));
        }
        
        if !opt_append.is_empty() {
            println!("Arguments to append: {}", opt_append.join(", "));
        }
        
        if !opt_replace.is_empty() {
            println!("Arguments to replace: {}", opt_replace.join(", "));
        }
        
        if !opt_delete.is_empty() {
            println!("Arguments to delete: {}", opt_delete.join(", "));
        }
        
        if !opt_append_if_missing.is_empty() {
            println!("Arguments to append if missing: {}", opt_append_if_missing.join(", "));
        }
        
        if !opt_delete_if_present.is_empty() {
            println!("Arguments to delete if present: {}", opt_delete_if_present.join(", "));
        }
        
        if let Some(ref index) = opt_deploy_index {
            println!("Deploy index: {}", index);
        }
        
        if opt_reboot {
            println!("Reboot: Enabled");
        }
        
        if opt_lock_finalization {
            println!("Lock finalization: Enabled");
        }
        
        if opt_unchanged_exit_77 {
            println!("Exit 77 if unchanged: Enabled");
        }
        
        if opt_import_proc_cmdline {
            println!("Import from /proc/cmdline: Enabled");
        }
        
        if opt_editor {
            println!("Editor mode: Enabled");
        }
        
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        if !ostree_manager.is_ostree_booted() {
            return Err(AptOstreeError::System("System is not booted from OSTree".to_string()));
        }
        
        // Get current deployment info
        let deployments = ostree_manager.list_deployments()?;
        let current_deployment = deployments.iter()
            .find(|d| d.booted)
            .ok_or_else(|| AptOstreeError::System("No booted deployment found".to_string()))?;
        
        println!("Current deployment: {} (commit: {})", current_deployment.id, current_deployment.commit);
        
        // Get current kernel arguments
        let deploy_index = opt_deploy_index.as_ref().map(|s| s.parse().unwrap_or(0));
        let current_kargs = ostree_manager.get_kernel_args(deploy_index)?;
        
        if current_kargs.is_empty() {
            println!("Current kernel arguments: (none)");
        } else {
            println!("Current kernel arguments:");
            for (i, arg) in current_kargs.iter().enumerate() {
                println!("  {}. {}", i + 1, arg);
            }
        }
        println!();
        
        // Handle different operations
        let mut changes_made = false;
        
        // Append arguments
        if !opt_append.is_empty() || !kernel_args.is_empty() {
            let mut args_to_append = Vec::new();
            args_to_append.extend(opt_append.clone());
            args_to_append.extend(kernel_args.clone());
            
            println!("Appending kernel arguments: {}", args_to_append.join(", "));
            ostree_manager.append_kernel_args(deploy_index, &args_to_append)?;
            changes_made = true;
        }
        
        // Append if missing
        if !opt_append_if_missing.is_empty() {
            println!("Appending kernel arguments if missing: {}", opt_append_if_missing.join(", "));
            ostree_manager.append_kernel_args(deploy_index, &opt_append_if_missing)?;
            changes_made = true;
        }
        
        // Replace arguments
        for replace_arg in &opt_replace {
            if let Some((key, old_val, new_val)) = parse_replace_argument(replace_arg) {
                println!("Replacing kernel argument: {}={} -> {}={}", key, old_val, key, new_val);
                let old_arg = format!("{}={}", key, old_val);
                let new_arg = format!("{}={}", key, new_val);
                ostree_manager.replace_kernel_args(deploy_index, &old_arg, &new_arg)?;
                changes_made = true;
            } else {
                println!("Warning: Invalid replace format: {}. Expected format: KEY=OLD=NEW", replace_arg);
            }
        }
        
        // Delete arguments
        if !opt_delete.is_empty() {
            println!("Deleting kernel arguments: {}", opt_delete.join(", "));
            ostree_manager.delete_kernel_args(deploy_index, &opt_delete)?;
            changes_made = true;
        }
        
        // Delete if present
        if !opt_delete_if_present.is_empty() {
            println!("Deleting kernel arguments if present: {}", opt_delete_if_present.join(", "));
            ostree_manager.delete_kernel_args(deploy_index, &opt_delete_if_present)?;
            changes_made = true;
        }
        
        // Import from /proc/cmdline
        if opt_import_proc_cmdline {
            println!("Importing kernel arguments from /proc/cmdline...");
            let proc_cmdline = std::fs::read_to_string("/proc/cmdline")
                .map_err(|e| AptOstreeError::System(format!("Failed to read /proc/cmdline: {}", e)))?;
            
            let args: Vec<String> = proc_cmdline
                .split_whitespace()
                .map(|s| s.to_string())
                .collect();
            
            println!("Imported {} kernel arguments", args.len());
            ostree_manager.set_kernel_args(deploy_index, &args)?;
            changes_made = true;
        }
        
        // Show updated kernel arguments if changes were made
        if changes_made {
            println!();
            let updated_kargs = ostree_manager.get_kernel_args(deploy_index)?;
            println!("Updated kernel arguments:");
            for (i, arg) in updated_kargs.iter().enumerate() {
                println!("  {}. {}", i + 1, arg);
            }
            
            if opt_reboot {
                println!();
                println!("⚠️  Kernel arguments have been modified.");
                println!("Reboot required to apply changes.");
                println!("Run 'sudo reboot' to reboot the system.");
            }
        } else if opt_unchanged_exit_77 {
            println!("No changes were made to kernel arguments.");
            std::process::exit(77);
        } else {
            println!("No changes were made to kernel arguments.");
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "kargs"
    }
    
    fn description(&self) -> &'static str {
        "Query or modify kernel arguments for OSTree deployments"
    }
    
    fn show_help(&self) {
        println!("apt-ostree kargs - Query or modify kernel arguments for OSTree deployments");
        println!();
        println!("Usage: apt-ostree kargs [OPTIONS] [KERNEL_ARGS...]");
        println!();
        println!("Arguments:");
        println!("  KERNEL_ARGS              Kernel arguments to append (alternative to --append)");
        println!();
        println!("Options:");
        println!("  --reboot                 Initiate a reboot after operation is complete");
        println!("  --lock-finalization      Lock the finalization of the staged deployment");
        println!("  --unchanged-exit-77      Exit with code 77 if no changes were made");
        println!("  --import-proc-cmdline    Import kernel args from current /proc/cmdline");
        println!("  --editor                 Use an editor to modify kernel arguments");
        println!("  --deploy-index <INDEX>   Modify kernel args from specific deployment index");
        println!("  --append <KEY=VALUE>     Append kernel argument");
        println!("  --replace <KEY=OLD=NEW>  Replace existing kernel argument");
        println!("  --delete <KEY=VALUE>     Delete specific kernel argument");
        println!("  --append-if-missing <KEY=VALUE>  Append only if key is not present");
        println!("  --delete-if-present <KEY=VALUE>  Delete only if key is present");
        println!("  --help, -h               Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree kargs                                    # Show current kernel args");
        println!("  apt-ostree kargs --append 'console=ttyS0'           # Append console argument");
        println!("  apt-ostree kargs --delete 'quiet'                   # Delete quiet argument");
        println!("  apt-ostree kargs --replace 'console=tty0=ttyS0'     # Replace console value");
        println!("  apt-ostree kargs --editor                           # Edit in text editor");
        println!("  apt-ostree kargs --reboot --append 'debug'          # Append and reboot");
        println!("  apt-ostree kargs --deploy-index 1 --append 'debug'  # Modify specific deployment");
        println!("  apt-ostree kargs 'console=ttyS0' 'debug'            # Append multiple args");
    }
}

/// Parse replace argument in format KEY=OLD=NEW
fn parse_replace_argument(arg: &str) -> Option<(&str, &str, &str)> {
    let parts: Vec<&str> = arg.split('=').collect();
    if parts.len() == 3 {
        Some((parts[0], parts[1], parts[2]))
    } else {
        None
    }
}

/// Reload command - Reload daemon configuration
pub struct ReloadCommand;

impl ReloadCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for ReloadCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        println!("🔄 Reload Daemon Configuration");
        println!("==============================");
        println!("Status: Placeholder implementation");
        println!("Next: Implement real reload logic");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "reload"
    }
    
    fn description(&self) -> &'static str {
        "Reload daemon configuration"
    }
    
    fn show_help(&self) {
        println!("apt-ostree reload - Reload daemon configuration");
        println!();
        println!("Usage: apt-ostree reload");
        println!();
        println!("Description:");
        println!("  Reloads the apt-ostreed daemon configuration without restarting the service.");
        println!("  This is useful after making changes to configuration files.");
        println!();
        println!("Options:");
        println!("  --help, -h    Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree reload                    # Reload daemon configuration");
    }
}

/// Start Daemon command - Start the apt-ostree daemon
pub struct StartDaemonCommand;

impl StartDaemonCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for StartDaemonCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_debug = false;
        let mut opt_sysroot = "/".to_string();
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--debug" | "-d" => opt_debug = true,
                "--sysroot" => {
                    if i + 1 < args.len() {
                        opt_sysroot = args[i + 1].clone();
                        i += 1;
                    }
                }
                _ => {
                    if !args[i].starts_with('-') {
                        // Assume it's a sysroot path
                        opt_sysroot = args[i].clone();
                    }
                }
            }
            i += 1;
        }
        
        println!("🚀 Starting apt-ostree Daemon");
        println!("=============================");
        
        if opt_debug {
            println!("Debug mode: Enabled");
        }
        println!("System root: {}", opt_sysroot);
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        // Check if daemon is already running
        println!("Checking if daemon is already running...");
        
        // TODO: Implement real daemon status check when systemd integration is ready
        println!("Status: Daemon startup initiated");
        println!("Next: Implement real daemon startup logic");
        println!();
        println!("Note: Use 'systemctl start apt-ostreed' for systemd integration");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "start-daemon"
    }
    
    fn description(&self) -> &'static str {
        "Start the apt-ostree daemon"
    }
    
    fn show_help(&self) {
        println!("Usage: apt-ostree start-daemon [OPTIONS] [SYSROOT]");
        println!();
        println!("Start the apt-ostree daemon for system management.");
        println!();
        println!("Arguments:");
        println!("  SYSROOT              System root path (default: /)");
        println!();
        println!("Options:");
        println!("  --debug, -d          Enable debug output");
        println!("  --sysroot PATH       Use system root PATH");
        println!("  --help, -h           Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree start-daemon");
        println!("  apt-ostree start-daemon --debug /mnt");
        println!("  apt-ostree start-daemon /var/mnt");
    }
}

/// Cancel command - Cancel an active transaction
pub struct CancelCommand;

impl CancelCommand {
    pub fn new() -> Self {
        Self
    }
}

impl Command for CancelCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options
        let mut opt_transaction_id = None;
        let mut opt_all = false;
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--transaction-id" => {
                    if i + 1 < args.len() {
                        opt_transaction_id = Some(args[i + 1].clone());
                        i += 1;
                    }
                }
                "--all" => opt_all = true,
                _ => {
                    if !args[i].starts_with('-') {
                        // Assume it's a transaction ID
                        opt_transaction_id = Some(args[i].clone());
                    }
                }
            }
            i += 1;
        }
        
        println!("❌ Cancel Transaction");
        println!("====================");
        
        if opt_all {
            println!("Mode: Cancel all pending transactions");
        } else if let Some(ref id) = opt_transaction_id {
            println!("Mode: Cancel specific transaction");
            println!("Transaction ID: {}", id);
        } else {
            println!("Mode: Cancel active transaction");
        }
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = OstreeManager::new();
        if !ostree_manager.is_available() {
            return Err(AptOstreeError::System("OSTree not available on this system".to_string()));
        }
        
        // TODO: Implement real transaction cancellation when daemon is ready
        println!("Status: Transaction cancellation initiated");
        println!("Next: Implement real transaction cancellation logic");
        println!();
        println!("Note: This will cancel pending operations and restore system state");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "cancel"
    }
    
    fn description(&self) -> &'static str {
        "Cancel an active transaction"
    }
    
    fn show_help(&self) {
        println!("Usage: apt-ostree cancel [OPTIONS] [TRANSACTION_ID]");
        println!();
        println!("Cancel an active transaction or all pending transactions.");
        println!();
        println!("Arguments:");
        println!("  TRANSACTION_ID        Transaction ID to cancel");
        println!();
        println!("Options:");
        println!("  --transaction-id ID   Cancel specific transaction ID");
        println!("  --all                 Cancel all pending transactions");
        println!("  --help, -h            Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree cancel");
        println!("  apt-ostree cancel abc123");
        println!("  apt-ostree cancel --transaction-id abc123");
        println!("  apt-ostree cancel --all");
    }
}