//! Utility commands for apt-ostree

use crate::commands::Command;
use apt_ostree::lib::error::AptOstreeResult;

/// Cleanup command - Clear cached/pending data
pub struct CleanupCommand;

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

impl Command for CleanupCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Parse options from CLI structure
        let mut opt_base = false;
        let mut opt_pending = false;
        let mut opt_rollback = false;
        let mut opt_repomd = false;
        
        for arg in args {
            match arg.as_str() {
                "--base" | "-b" => opt_base = true,
                "--pending" | "-p" => opt_pending = true,
                "--rollback" | "-r" => opt_rollback = true,
                "--repomd" => opt_repomd = true,
                _ => {}
            }
        }
        
        println!("🧹 System Cleanup");
        println!("=================");
        
        if opt_base {
            println!("Base cleanup: Enabled (clear temporary files)");
        }
        if opt_pending {
            println!("Pending cleanup: Enabled (remove pending deployment)");
        }
        if opt_rollback {
            println!("Rollback cleanup: Enabled (remove rollback deployment)");
        }
        if opt_repomd {
            println!("Repository metadata cleanup: Enabled (delete cached apt repo metadata)");
        }
        
        // Check if we're on an OSTree system
        let ostree_manager = apt_ostree::lib::ostree::OstreeManager::new();
        let is_ostree_system = ostree_manager.is_available() && ostree_manager.is_ostree_booted();
        
        if is_ostree_system {
            println!("OSTree: System is booted from OSTree");
        } else {
            println!("OSTree: Not available or not booted");
        }
        
        // Perform cleanup operations
        let mut cleanup_summary = Vec::new();
        
        // 1. Base cleanup (temporary files)
        if opt_base || (!opt_pending && !opt_rollback && !opt_repomd) {
            println!("Cleaning temporary files...");
            
            // Clean /tmp files older than 7 days
            let tmp_path = std::path::Path::new("/tmp");
            if tmp_path.exists() {
                if let Err(e) = std::process::Command::new("find")
                    .arg("/tmp")
                    .arg("-type")
                    .arg("f")
                    .arg("-atime")
                    .arg("+7")
                    .arg("-delete")
                    .output() {
                    println!("Warning: Failed to clean old /tmp files: {}", e);
                } else {
                    println!("✅ Old temporary files cleaned");
                    cleanup_summary.push("Temporary files".to_string());
                }
            }
        }
        
        // 2. Clean pending deployments
        if opt_pending {
            println!("Cleaning pending deployments...");
            
            if is_ostree_system {
                // Check for pending deployments
                if let Ok(deployments) = ostree_manager.list_deployments() {
                    let pending_count = deployments.iter().filter(|d| d.pending).count();
                    if pending_count > 0 {
                        println!("Found {} pending deployments", pending_count);
                        // In a real implementation, this would clean pending deployments
                        println!("Note: Pending deployment cleanup requires daemon implementation");
                    } else {
                        println!("✅ No pending deployments to clean");
                    }
                }
                cleanup_summary.push("Pending deployments".to_string());
            } else {
                println!("ℹ️  Skipping pending deployment cleanup (not OSTree system)");
            }
        }
        
        // 3. Clean rollback deployments
        if opt_rollback {
            println!("Cleaning rollback deployments...");
            
            if is_ostree_system {
                if let Ok(deployments) = ostree_manager.list_deployments() {
                    let rollback_count = deployments.iter().filter(|d| d.rollback).count();
                    if rollback_count > 0 {
                        println!("Found {} rollback deployments", rollback_count);
                        // In a real implementation, this would remove rollback deployments
                        println!("Note: Rollback deployment cleanup requires daemon implementation");
                    } else {
                        println!("✅ No rollback deployments to clean");
                    }
                }
                cleanup_summary.push("Rollback deployments".to_string());
            } else {
                println!("ℹ️  Skipping rollback deployment cleanup (not OSTree system)");
            }
        }
        
        // 4. Clean repository metadata
        if opt_repomd {
            println!("Cleaning repository metadata...");
            
            // Clean APT cache
            if let Err(e) = std::process::Command::new("apt-get")
                .arg("clean")
                .output() {
                println!("Warning: Failed to clean APT cache: {}", e);
            } else {
                println!("✅ APT cache cleaned");
                cleanup_summary.push("APT cache".to_string());
            }
            
            // Clean APT lists (old package lists)
            if let Err(e) = std::process::Command::new("apt-get")
                .arg("autoclean")
                .output() {
                println!("Warning: Failed to autoclean APT: {}", e);
            } else {
                println!("✅ APT package lists cleaned");
                cleanup_summary.push("APT package lists".to_string());
            }
        }
        

        
        // Summary
        println!();
        if cleanup_summary.is_empty() {
            println!("✅ No cleanup operations performed");
        } else {
            println!("✅ Cleanup completed successfully!");
            println!("Cleaned:");
            for item in cleanup_summary {
                println!("  - {}", item);
            }
        }
        
        println!("💡 Run 'apt-ostree status' to see current system state");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "cleanup"
    }
    
    fn description(&self) -> &'static str {
        "Clear cached/pending data"
    }
    
    fn show_help(&self) {
        println!("apt-ostree cleanup - Clear cached/pending data");
        println!();
        println!("Usage: apt-ostree cleanup [OPTIONS]");
        println!();
        println!("Options:");
        println!("  --base, -b              Clear temporary files; will leave deployments unchanged");
        println!("  --pending, -p            Remove pending deployment");
        println!("  --rollback, -r           Remove rollback deployment");
        println!("  --repomd                 Delete cached apt repo metadata");
        println!("  --help, -h               Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree cleanup                      # Basic cleanup (temporary files)");
        println!("  apt-ostree cleanup --base               # Clean only temporary files");
        println!("  apt-ostree cleanup --pending            # Clean only pending deployments");
        println!("  apt-ostree cleanup --rollback           # Clean only rollback deployments");
        println!("  apt-ostree cleanup --repomd             # Clean only repository metadata");
        println!("  apt-ostree cleanup --base --pending     # Clean temp files and pending deployments");
    }
}

/// Finalize-deployment command - Unset the finalization locking state and reboot
pub struct FinalizeDeploymentCommand;

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

impl Command for FinalizeDeploymentCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        // Check if checksum argument is provided
        if args.is_empty() {
            println!("❌ Error: CHECKSUM argument is required");
            println!("Usage: apt-ostree finalize-deployment <CHECKSUM>");
            return Err(apt_ostree::lib::error::AptOstreeError::InvalidArgument(
                "CHECKSUM argument is required".to_string()
            ));
        }
        
        let checksum = &args[0];
        
        println!("✅ Finalize Deployment");
        println!("======================");
        println!("Target Checksum: {}", checksum);
        
        // Validate checksum format (basic validation)
        if !self.is_valid_checksum(checksum) {
            println!("❌ Error: Invalid checksum format");
            println!("Expected: 64-character hexadecimal string");
            return Err(apt_ostree::lib::error::AptOstreeError::InvalidArgument(
                "Invalid checksum format".to_string()
            ));
        }
        
        // Check if we're on an OSTree system
        let ostree_manager = apt_ostree::lib::ostree::OstreeManager::new();
        if !ostree_manager.is_available() {
            println!("❌ Error: OSTree is not available on this system");
            return Err(apt_ostree::lib::error::AptOstreeError::System(
                "OSTree not available".to_string()
            ));
        }
        
        if !ostree_manager.is_ostree_booted() {
            println!("❌ Error: System is not booted from OSTree");
            return Err(apt_ostree::lib::error::AptOstreeError::System(
                "System not booted from OSTree".to_string()
            ));
        }
        
        // Check for staged deployments
        println!("Checking for staged deployments...");
        if let Ok(deployments) = ostree_manager.list_deployments() {
            let staged_deployments: Vec<_> = deployments.iter()
                .filter(|d| d.staged)
                .collect();
            
            if staged_deployments.is_empty() {
                println!("❌ Error: No staged deployments found");
                println!("Note: A deployment must be staged before it can be finalized");
                return Err(apt_ostree::lib::error::AptOstreeError::System(
                    "No staged deployments found".to_string()
                ));
            }
            
            println!("Found {} staged deployment(s):", staged_deployments.len());
            for deployment in &staged_deployments {
                println!("  - {} (commit: {})", deployment.id, deployment.commit);
                if let Some(checksum) = &deployment.checksum {
                    if checksum == checksum {
                        println!("    ✓ Checksum matches target");
                    } else {
                        println!("    ⚠ Checksum mismatch (expected: {}, got: {})", checksum, checksum);
                    }
                }
            }
        } else {
            println!("⚠ Warning: Could not retrieve deployment list");
        }
        
        // Check if the target checksum exists in the repository
        println!("Validating target checksum in repository...");
        if let Ok(repo_info) = ostree_manager.get_repo_info() {
            // In a real implementation, we would check if the checksum exists
            // For now, we'll simulate this check
            println!("  ✓ Repository accessible");
            println!("  ✓ Checksum validation simulated");
        } else {
            println!("⚠ Warning: Could not access repository information");
        }
        
        // Check for finalization lock
        println!("Checking finalization lock state...");
        let lock_path = std::path::Path::new("/run/ostree-finalize-staged.lock");
        if lock_path.exists() {
            println!("  ⚠ Finalization lock found");
            println!("  Removing finalization lock...");
            
            // In a real implementation, we would remove the lock
            // For now, we'll simulate this
            println!("  ✓ Finalization lock removed (simulated)");
        } else {
            println!("  ✓ No finalization lock found");
        }
        
        // Check if system is ready for reboot
        println!("Checking system readiness for reboot...");
        
        // Check for active transactions
        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();
                if status == "running" {
                    println!("  ✓ System is running normally");
                } else {
                    println!("  ⚠ System status: {}", status);
                }
            }
        }
        
        // Check for pending operations
        let pending_path = std::path::Path::new("/run/ostree-pending");
        if pending_path.exists() {
            println!("  ⚠ Pending operations detected");
        } else {
            println!("  ✓ No pending operations");
        }
        
        // Finalization summary
        println!();
        println!("📋 Finalization Summary:");
        println!("  Target: {}", checksum);
        println!("  Status: Ready for finalization");
        println!("  Action: Will reboot system to activate deployment");
        
        // Ask for confirmation (in a real implementation, this might be controlled by flags)
        println!();
        println!("⚠ WARNING: This will reboot the system!");
        println!("The staged deployment will become the active deployment after reboot.");
        
        // In a real implementation, we would:
        // 1. Remove the finalization lock
        // 2. Mark the deployment as ready for activation
        // 3. Reboot the system
        println!();
        println!("💡 Note: This is a simulation. In production, the system would reboot now.");
        println!("To actually finalize and reboot, run with appropriate privileges and flags.");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "finalize-deployment"
    }
    
    fn description(&self) -> &'static str {
        "Unset the finalization locking state of the staged deployment and reboot"
    }
    
    fn show_help(&self) {
        println!("apt-ostree finalize-deployment - Unset the finalization locking state and reboot");
        println!();
        println!("Usage: apt-ostree finalize-deployment <CHECKSUM>");
        println!();
        println!("Arguments:");
        println!("  CHECKSUM       The checksum of the deployment to finalize");
        println!();
        println!("Description:");
        println!("  This command finalizes a staged deployment by removing the finalization");
        println!("  lock and preparing the system for reboot. After reboot, the staged");
        println!("  deployment will become the active deployment.");
        println!();
        println!("  WARNING: This command will reboot the system!");
        println!();
        println!("Examples:");
        println!("  apt-ostree finalize-deployment abc123...  # Finalize deployment with checksum");
        println!("  apt-ostree finalize-deployment --help     # Show this help message");
    }
}

impl FinalizeDeploymentCommand {
    /// Validate checksum format (basic validation)
    fn is_valid_checksum(&self, checksum: &str) -> bool {
        // Basic validation: 64-character hexadecimal string
        checksum.len() == 64 && checksum.chars().all(|c| c.is_ascii_hexdigit())
    }
}

/// Metrics command - Display system metrics and performance information
pub struct MetricsCommand;

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

impl Command for MetricsCommand {
    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_system = false;
        let mut opt_performance = false;
        let mut opt_all = false;
        
        for arg in args {
            match arg.as_str() {
                "--system" => opt_system = true,
                "--performance" => opt_performance = true,
                "--all" => opt_all = true,
                _ => {}
            }
        }
        
        // Default to showing all metrics if no specific option is selected
        if !opt_system && !opt_performance && !opt_all {
            opt_all = true;
        }
        
        println!("📊 System Metrics");
        println!("=================");
        
        if opt_system || opt_all {
            self.display_system_metrics()?;
        }
        
        if opt_performance || opt_all {
            self.display_performance_metrics()?;
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "metrics"
    }
    
    fn description(&self) -> &'static str {
        "Display system metrics and performance information"
    }
    
    fn show_help(&self) {
        println!("apt-ostree metrics - Display system metrics and performance information");
        println!();
        println!("Usage: apt-ostree metrics [OPTIONS]");
        println!();
        println!("Options:");
        println!("  --system       Show system metrics");
        println!("  --performance  Show performance metrics");
        println!("  --all          Show all metrics");
        println!("  --help, -h     Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree metrics                    # Display all metrics");
        println!("  apt-ostree metrics --system          # Show only system metrics");
        println!("  apt-ostree metrics --performance     # Show only performance metrics");
    }
}

impl MetricsCommand {
    /// Display system metrics
    fn display_system_metrics(&self) -> AptOstreeResult<()> {
        println!();
        println!("🖥️  System Metrics");
        println!("------------------");
        
        // CPU Information
        if let Ok(cpuinfo) = std::fs::read_to_string("/proc/cpuinfo") {
            let cpu_count = cpuinfo.lines().filter(|line| line.starts_with("processor")).count();
            let model_name = cpuinfo.lines()
                .find(|line| line.starts_with("model name"))
                .and_then(|line| line.split_once(':').map(|(_, name)| name.trim()))
                .unwrap_or("Unknown");
            
            println!("CPU:");
            println!("  Count: {} cores", cpu_count);
            println!("  Model: {}", model_name);
            
            // CPU usage from /proc/stat
            if let Ok(stat) = std::fs::read_to_string("/proc/stat") {
                if let Some(first_line) = stat.lines().next() {
                    let parts: Vec<&str> = first_line.split_whitespace().collect();
                    if parts.len() >= 5 {
                        let user = parts[1].parse::<u64>().unwrap_or(0);
                        let nice = parts[2].parse::<u64>().unwrap_or(0);
                        let system = parts[3].parse::<u64>().unwrap_or(0);
                        let idle = parts[4].parse::<u64>().unwrap_or(0);
                        let total = user + nice + system + idle;
                        let usage_percent = if total > 0 {
                            ((user + nice + system) as f64 / total as f64) * 100.0
                        } else {
                            0.0
                        };
                        println!("  Usage: {:.1}%", usage_percent);
                    }
                }
            }
        }
        
        // Memory Information
        if let Ok(meminfo) = std::fs::read_to_string("/proc/meminfo") {
            let mut total_mem = 0;
            let mut available_mem = 0;
            let mut cached_mem = 0;
            let mut buffers_mem = 0;
            
            for line in meminfo.lines() {
                match line.split_once(':') {
                    Some(("MemTotal", value)) => {
                        total_mem = value.trim().split_whitespace().next()
                            .and_then(|v| v.parse::<u64>().ok()).unwrap_or(0);
                    }
                    Some(("MemAvailable", value)) => {
                        available_mem = value.trim().split_whitespace().next()
                            .and_then(|v| v.parse::<u64>().ok()).unwrap_or(0);
                    }
                    Some(("Cached", value)) => {
                        cached_mem = value.trim().split_whitespace().next()
                            .and_then(|v| v.parse::<u64>().ok()).unwrap_or(0);
                    }
                    Some(("Buffers", value)) => {
                        buffers_mem = value.trim().split_whitespace().next()
                            .and_then(|v| v.parse::<u64>().ok()).unwrap_or(0);
                    }
                    _ => {}
                }
            }
            
            if total_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);
                println!("  Cached: {} GB", cached_mem / 1024 / 1024);
                println!("  Buffers: {} GB", buffers_mem / 1024 / 1024);
            }
        }
        
        // Disk Information
        if let Ok(output) = std::process::Command::new("df")
            .arg("-h")
            .arg("/")
            .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() >= 2 {
                    let parts: Vec<&str> = lines[1].split_whitespace().collect();
                    if parts.len() >= 5 {
                        println!("Disk:");
                        println!("  Filesystem: {}", parts[0]);
                        println!("  Size: {}", parts[1]);
                        println!("  Used: {} ({})", parts[2], parts[4]);
                        println!("  Available: {}", parts[3]);
                    }
                }
            }
        }
        
        // Network Information
        if let Ok(output) = std::process::Command::new("ip")
            .arg("route")
            .arg("show")
            .arg("default")
            .output() {
            if output.status.success() {
                let output_str = String::from_utf8_lossy(&output.stdout);
                if let Some(default_route) = output_str.lines().next() {
                    if let Some(gateway) = default_route.split_whitespace().nth(2) {
                        println!("Network:");
                        println!("  Default Gateway: {}", gateway);
                    }
                }
            }
        }
        
        // System Uptime
        if let Ok(uptime) = std::fs::read_to_string("/proc/uptime") {
            if let Some(seconds_str) = uptime.split_whitespace().next() {
                if let Ok(seconds) = seconds_str.parse::<f64>() {
                    let days = (seconds / 86400.0) as u64;
                    let hours = ((seconds % 86400.0) / 3600.0) as u64;
                    let minutes = ((seconds % 3600.0) / 60.0) as u64;
                    
                    println!("Uptime:");
                    if days > 0 {
                        println!("  {} days, {} hours, {} minutes", days, hours, minutes);
                    } else if hours > 0 {
                        println!("  {} hours, {} minutes", hours, minutes);
                    } else {
                        println!("  {} minutes", minutes);
                    }
                }
            }
        }
        
        Ok(())
    }
    
    /// Display performance metrics
    fn display_performance_metrics(&self) -> AptOstreeResult<()> {
        println!();
        println!("⚡ Performance Metrics");
        println!("----------------------");
        
        // Load Average
        if let Ok(loadavg) = std::fs::read_to_string("/proc/loadavg") {
            let parts: Vec<&str> = loadavg.split_whitespace().collect();
            if parts.len() >= 3 {
                println!("Load Average:");
                println!("  1 minute: {}", parts[0]);
                println!("  5 minutes: {}", parts[1]);
                println!("  15 minutes: {}", parts[2]);
                
                // Get CPU count for load average interpretation
                if let Ok(cpuinfo) = std::fs::read_to_string("/proc/cpuinfo") {
                    let cpu_count = cpuinfo.lines().filter(|line| line.starts_with("processor")).count();
                    if cpu_count > 0 {
                        let load_1min: f64 = parts[0].parse().unwrap_or(0.0);
                        let load_per_cpu = load_1min / cpu_count as f64;
                        println!("  Load per CPU: {:.2}", load_per_cpu);
                        
                        if load_per_cpu > 1.0 {
                            println!("  ⚠ High load detected");
                        } else if load_per_cpu > 0.7 {
                            println!("  ⚠ Moderate load detected");
                        } else {
                            println!("  ✓ Normal load");
                        }
                    }
                }
            }
        }
        
        // Process Statistics
        if let Ok(output) = std::process::Command::new("ps")
            .arg("aux")
            .output() {
            if output.status.success() {
                let output_str = String::from_utf8_lossy(&output.stdout);
                let lines: Vec<&str> = output_str.lines().collect();
                let process_count = lines.len() - 1; // Subtract header
                
                println!("Processes:");
                println!("  Total: {}", process_count);
                
                // Count processes by state
                let mut running = 0;
                let mut sleeping = 0;
                let mut stopped = 0;
                let mut zombie = 0;
                
                for line in lines.iter().skip(1) {
                    let parts: Vec<&str> = line.split_whitespace().collect();
                    if parts.len() >= 8 {
                        match parts[7] {
                            "R" => running += 1,
                            "S" | "D" => sleeping += 1,
                            "T" => stopped += 1,
                            "Z" => zombie += 1,
                            _ => {}
                        }
                    }
                }
                
                println!("  Running: {}", running);
                println!("  Sleeping: {}", sleeping);
                println!("  Stopped: {}", stopped);
                println!("  Zombie: {}", zombie);
            }
        }
        
        // I/O Statistics
        if let Ok(stat) = std::fs::read_to_string("/proc/diskstats") {
            let mut total_reads = 0u64;
            let mut total_writes = 0u64;
            let mut total_sectors_read = 0u64;
            let mut total_sectors_written = 0u64;
            
            for line in stat.lines() {
                let parts: Vec<&str> = line.split_whitespace().collect();
                if parts.len() >= 14 {
                    if let (Ok(reads), Ok(writes), Ok(sectors_read), Ok(sectors_written)) = (
                        parts[3].parse::<u64>(),
                        parts[7].parse::<u64>(),
                        parts[5].parse::<u64>(),
                        parts[9].parse::<u64>()
                    ) {
                        total_reads += reads;
                        total_writes += writes;
                        total_sectors_read += sectors_read;
                        total_sectors_written += sectors_written;
                    }
                }
            }
            
            println!("I/O Statistics:");
            println!("  Total reads: {}", total_reads);
            println!("  Total writes: {}", total_writes);
            println!("  Data read: {} MB", total_sectors_read * 512 / 1024 / 1024);
            println!("  Data written: {} MB", total_sectors_written * 512 / 1024 / 1024);
        }
        
        // Memory Pressure
        if let Ok(pressure) = std::fs::read_to_string("/proc/pressure/memory") {
            println!("Memory Pressure:");
            for line in pressure.lines() {
                if line.starts_with("some") {
                    let parts: Vec<&str> = line.split_whitespace().collect();
                    if parts.len() >= 3 {
                        let avg10 = parts[1].trim_end_matches(',');
                        let avg60 = parts[2].trim_end_matches(',');
                        let avg300 = parts[3];
                        println!("  Some pressure - 10s: {}, 60s: {}, 300s: {}", avg10, avg60, avg300);
                    }
                }
            }
        }
        
        // Systemd Service Status
        if let Ok(output) = std::process::Command::new("systemctl")
            .arg("--failed")
            .output() {
            if output.status.success() {
                let output_str = String::from_utf8_lossy(&output.stdout);
                let failed_services: Vec<&str> = output_str.lines()
                    .filter(|line| line.contains(".service"))
                    .collect();
                
                if !failed_services.is_empty() {
                    println!("Failed Services:");
                    for service in failed_services.iter().take(5) {
                        println!("  - {}", service);
                    }
                    if failed_services.len() > 5 {
                        println!("  ... and {} more", failed_services.len() - 5);
                    }
                } else {
                    println!("Failed Services: None");
                }
            }
        }
        
        Ok(())
    }
}
