//! Package management commands for apt-ostree

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

/// Install command - Overlay additional packages
pub struct InstallCommand;

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

impl Command for InstallCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        if args.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No packages specified. Use --help for usage information.".to_string()
            ));
        }
        
        // Parse options
        let mut opt_dry_run = false;
        let mut opt_verbose = false;
        let mut opt_no_deps = false;
        let packages: Vec<String> = args.iter()
            .filter(|arg| !arg.starts_with('-'))
            .cloned()
            .collect();
        
        for arg in args {
            match arg.as_str() {
                "--dry-run" | "-n" => opt_dry_run = true,
                "--verbose" | "-v" => opt_verbose = true,
                "--no-deps" => opt_no_deps = true,
                "--help" | "-h" => {
                    self.show_help();
                    return Ok(());
                }
                _ => {}
            }
        }
        
        if packages.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No packages specified. Use --help for usage information.".to_string()
            ));
        }
        
        println!("📦 Install Packages");
        println!("===================");
        println!("Packages to install: {}", packages.join(", "));
        
        if opt_dry_run {
            println!("Mode: Dry run (no actual installation)");
        }
        if opt_verbose {
            println!("Mode: Verbose output");
        }
        if opt_no_deps {
            println!("Mode: No dependency installation");
        }
        println!();
        
        // Use the real APT manager for installation
        use apt_ostree::lib::apt::AptManager;
        let apt_manager = AptManager::new();
        
        // Check if APT is available
        if !apt_manager.check_database_health()? {
            return Err(AptOstreeError::System("APT database is not healthy".to_string()));
        }
        
        if opt_dry_run {
            println!("Dry run mode - would install the following packages:");
            for package in &packages {
                if let Ok(Some(pkg_info)) = apt_manager.get_package_info(package) {
                    println!("  {} (version: {})", pkg_info.name, pkg_info.version);
                    println!("    Description: {}", pkg_info.description);
                    if !pkg_info.depends.is_empty() {
                        println!("    Dependencies: {}", pkg_info.depends.join(", "));
                    }
                    println!();
                } else {
                    println!("  {} - Package not found", package);
                }
            }
            println!("Dry run completed. No packages were actually installed.");
            return Ok(());
        }
        
        // Install packages
        for package in &packages {
            println!("Installing package: {}", package);
            
            // Since install_package is async, we'll use a simple approach for now
            // TODO: Make the Command trait async or use a different approach
            match apt_manager.install_package(package) {
                Ok(_) => println!("Successfully installed: {}", package),
                Err(e) => {
                    println!("Failed to install {}: {}", package, e);
                    return Err(e);
                }
            }
        }
        
        println!();
        println!("✅ All packages installed successfully!");
        println!("Note: On OSTree systems, packages are installed as overlays");
        println!("      and will persist across system updates.");
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "install"
    }
    
    fn description(&self) -> &'static str {
        "Overlay additional packages"
    }
    
    fn show_help(&self) {
        println!("apt-ostree install - Overlay additional packages");
        println!();
        println!("Usage: apt-ostree install <PACKAGES>... [OPTIONS]");
        println!();
        println!("Arguments:");
        println!("  PACKAGES      Package names to install");
        println!();
        println!("Options:");
        println!("  --dry-run, -n Show what would be installed without actually installing");
        println!("  --verbose, -v  Show detailed output during installation");
        println!("  --no-deps      Skip dependency installation (not recommended)");
        println!("  --help, -h     Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree install nginx");
        println!("  apt-ostree install nginx vim htop");
        println!("  apt-ostree install --dry-run nginx");
        println!("  apt-ostree install --verbose nginx");
        println!();
        println!("Note: On OSTree systems, packages are installed as overlays");
        println!("      and will persist across system updates.");
    }
}

/// Uninstall command - Remove overlayed additional packages
pub struct UninstallCommand;

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

impl Command for UninstallCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        if args.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No packages specified. Use --help for usage information.".to_string()
            ));
        }
        
        let packages: Vec<String> = args.iter()
            .filter(|arg| !arg.starts_with('-'))
            .cloned()
            .collect();
        
        if packages.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No packages specified. Use --help for usage information.".to_string()
            ));
        }
        
        println!("🗑️  Uninstall Packages");
        println!("=====================");
        println!("Packages to remove: {}", packages.join(", "));
        println!();
        
        // Check if we're on an OSTree system
        let ostree_manager = 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");
            println!("Mode: Package overlay removal");
        } else {
            println!("OSTree: Traditional package management system");
            println!("Mode: Standard package removal");
        }
        println!();
        
        // Use the real APT manager for package removal
        use apt_ostree::lib::apt::AptManager;
        let apt_manager = AptManager::new();
        
        // Check if APT is available
        if !apt_manager.check_database_health()? {
            return Err(AptOstreeError::System("APT database is not healthy".to_string()));
        }
        
        // Process each package
        let mut success_count = 0;
        let mut failure_count = 0;
        
        for package in &packages {
            println!("Removing package: {}", package);
            
            // Check if package is installed
            if !apt_manager.is_package_installed(package)? {
                println!("  Warning: Package '{}' is not installed", package);
                continue;
            }
            
            // Get package info before removal
            if let Ok(Some(pkg_info)) = apt_manager.get_package_info(package) {
                println!("  Package: {} (version: {})", pkg_info.name, pkg_info.version);
                println!("  Description: {}", pkg_info.description);
                
                // Check for reverse dependencies
                // TODO: Implement reverse dependency checking
                println!("  Checking dependencies...");
            }
            
            // Remove the package
            match apt_manager.remove_package(package) {
                Ok(_) => {
                    println!("  ✅ Successfully removed: {}", package);
                    success_count += 1;
                }
                Err(e) => {
                    println!("  ❌ Failed to remove {}: {}", package, e);
                    failure_count += 1;
                }
            }
            println!();
        }
        
        // Summary
        println!("Uninstall Summary:");
        println!("  Successfully removed: {} packages", success_count);
        if failure_count > 0 {
            println!("  Failed to remove: {} packages", failure_count);
        }
        
        if is_ostree_system {
            println!();
            println!("Note: On OSTree systems, package overlays have been removed.");
            println!("      The base system remains unchanged.");
        }
        
        if failure_count == 0 {
            println!("✅ All packages removed successfully!");
        } else {
            println!("⚠️  Some packages could not be removed. Check the output above.");
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "uninstall"
    }
    
    fn description(&self) -> &'static str {
        "Remove overlayed additional packages"
    }
    
    fn show_help(&self) {
        println!("apt-ostree uninstall - Remove overlayed additional packages");
        println!();
        println!("Usage: apt-ostree uninstall <PACKAGES>... [OPTIONS]");
        println!();
        println!("Arguments:");
        println!("  PACKAGES      Package names to remove");
        println!();
        println!("Options:");
        println!("  --help, -h    Show this help message");
    }
}

/// Search command - Search for packages
pub struct SearchCommand;

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

impl Command for SearchCommand {
    fn execute(&self, args: &[String]) -> AptOstreeResult<()> {
        if args.contains(&"--help".to_string()) || args.contains(&"-h".to_string()) {
            self.show_help();
            return Ok(());
        }
        
        if args.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No search query specified. Use --help for usage information.".to_string()
            ));
        }
        
        // Parse options
        let mut opt_exact = false;
        let mut opt_regex = false;
        let mut opt_verbose = false;
        let mut search_query = String::new();
        
        let mut i = 0;
        while i < args.len() {
            match args[i].as_str() {
                "--exact" | "-e" => opt_exact = true,
                "--regex" | "-r" => opt_regex = true,
                "--verbose" | "-v" => opt_verbose = true,
                "--help" | "-h" => {
                    self.show_help();
                    return Ok(());
                }
                arg if !arg.starts_with('-') => {
                    search_query = arg.to_string();
                }
                _ => {}
            }
            i += 1;
        }
        
        if search_query.is_empty() {
            return Err(AptOstreeError::InvalidArgument(
                "No search query specified. Use --help for usage information.".to_string()
            ));
        }
        
        println!("🔍 Package Search");
        println!("=================");
        println!("Query: {}", search_query);
        println!("Mode: {}", if opt_exact { "Exact Match" } else if opt_regex { "Regex" } else { "Standard Search" });
        println!();
        
        // Use the real APT manager for search
        use apt_ostree::lib::apt::AptManager;
        let apt_manager = AptManager::new();
        
        let packages = if opt_exact {
            apt_manager.search_packages_exact(&search_query)?
        } else if opt_regex {
            apt_manager.search_packages_regex(&search_query)?
        } else {
            apt_manager.search_packages(&search_query)?
        };
        
        if packages.is_empty() {
            println!("No packages found matching '{}'", search_query);
            return Ok(());
        }
        
        println!("Found {} packages:", packages.len());
        println!();
        
        for package in packages {
            let status = if package.installed { "✓" } else { " " };
            println!("{} {} - {}", status, package.name, package.description);
            
            if opt_verbose {
                println!("    Version: {}", package.version);
                println!("    Section: {}", package.section);
                println!("    Priority: {}", package.priority);
                if !package.depends.is_empty() {
                    println!("    Dependencies: {}", package.depends.join(", "));
                }
                println!();
            }
        }
        
        Ok(())
    }
    
    fn name(&self) -> &'static str {
        "search"
    }
    
    fn description(&self) -> &'static str {
        "Search for packages"
    }
    
    fn show_help(&self) {
        println!("apt-ostree search - Search for packages");
        println!();
        println!("Usage: apt-ostree search <QUERY> [OPTIONS]");
        println!();
        println!("Arguments:");
        println!("  QUERY         Search query (package name or description)");
        println!();
        println!("Options:");
        println!("  --exact, -e   Exact package name match");
        println!("  --regex, -r   Regular expression search");
        println!("  --verbose, -v Show detailed package information");
        println!("  --help, -h    Show this help message");
        println!();
        println!("Examples:");
        println!("  apt-ostree search nginx");
        println!("  apt-ostree search --exact nginx");
        println!("  apt-ostree search --regex '^nginx.*'");
        println!("  apt-ostree search --verbose nginx");
    }
}