use std::env;
use tracing::{info, error};

mod apt_compat;
mod error;

use apt_compat::AptManager;
use error::{AptOstreeError, AptOstreeResult};

#[tokio::main]
async fn main() -> AptOstreeResult<()> {
    // Initialize logging
    tracing_subscriber::fmt::init();
    
    info!("apt-ostree starting...");
    
    let args: Vec<String> = env::args().collect();
    if args.len() < 2 {
        println!("Usage: {} <command> [options]", args[0]);
        println!("Commands:");
        println!("  search <query>     - Search for packages");
        println!("  list               - List all packages");
        println!("  installed          - List installed packages");
        println!("  info <package>     - Show package information");
        println!("  install <package>  - Install package (atomic)");
        println!("  remove <package>   - Remove package (atomic)");
        println!("  upgrade            - Upgrade system (atomic)");
        println!("  status             - Show system status
        println!("  rollback           - Rollback to previous deployment")
            println!("  rollback           - Rollback to previous deployment")");
        println!("  help               - Show this help");
        return Ok(());
    }
    
    let command = &args[1];
    
    match command.as_str() {
        "search" => {
            if args.len() < 3 {
                error!("Search command requires a query");
                return Err(AptOstreeError::InvalidArgument("Search query required".to_string()));
            }
            let query = &args[2];
            search_packages(query).await?;
        }
        "list" => {
            list_packages().await?;
        }
        "installed" => {
            list_installed_packages().await?;
        }
        "info" => {
            if args.len() < 3 {
                error!("Info command requires a package name");
                return Err(AptOstreeError::InvalidArgument("Package name required".to_string()));
            }
            let package_name = &args[2];
            show_package_info(package_name).await?;
        }
        "install" => {
            if args.len() < 3 {
                error!("Install command requires a package name");
                return Err(AptOstreeError::InvalidArgument("Package name required".to_string()));
            }
            let package_name = &args[2];
            install_package(package_name).await?;
        }
        "remove" => {
            if args.len() < 3 {
                error!("Remove command requires a package name");
                return Err(AptOstreeError::InvalidArgument("Package name required".to_string()));
            }
            let package_name = &args[2];
            remove_package(package_name).await?;
        }
        "upgrade" => {
            upgrade_system().await?;
        }
        "status" => {
            show_system_status().await?;
        }
        "help" => {
            println!("apt-ostree - Debian/Ubuntu equivalent of rpm-ostree");
            println!("");
            println!("Commands:");
            println!("  search <query>     - Search for packages");
            println!("  list               - List all packages");
            println!("  installed          - List installed packages");
            println!("  info <package>     - Show package information");
            println!("  install <package>  - Install package (atomic)");
            println!("  remove <package>   - Remove package (atomic)");
            println!("  upgrade            - Upgrade system (atomic)");
            println!("  status             - Show system status
        println!("  rollback           - Rollback to previous deployment")
            println!("  rollback           - Rollback to previous deployment")");
            println!("  help               - Show this help");
        }
        _ => {
            error!("Unknown command: {}", command);
            return Err(AptOstreeError::InvalidArgument(format!("Unknown command: {}", command)));
        }
    }
    
    Ok(())
}

async fn search_packages(query: &str) -> AptOstreeResult<()> {
    info!("Searching for packages matching: {}", query);
    
    let mut apt_manager = AptManager::new()?;
    let packages = apt_manager.search_packages(query).await?;
    
    if packages.is_empty() {
        println!("No packages found matching '{}'", query);
    } else {
        println!("Found {} packages matching '{}':", packages.len(), query);
        for package in packages {
            println!("  {}", package);
        }
    }
    
    Ok(())
}

async fn list_packages() -> AptOstreeResult<()> {
    info!("Listing all packages");
    
    let mut apt_manager = AptManager::new()?;
    let packages = apt_manager.list_packages();
    
    println!("Total packages: {}", packages.len());
    for package in packages.iter().take(20) { // Show first 20
        println!("  {} ({})", package.name(), package.arch());
    }
    if packages.len() > 20 {
        println!("  ... and {} more", packages.len() - 20);
    }
    
    Ok(())
}

async fn list_installed_packages() -> AptOstreeResult<()> {
    info!("Listing installed packages");
    
    let mut apt_manager = AptManager::new()?;
    let packages = apt_manager.list_installed_packages();
    
    println!("Installed packages: {}", packages.len());
    for package in packages.iter().take(20) { // Show first 20
        println!("  {} ({})", package.name(), package.arch());
    }
    if packages.len() > 20 {
        println!("  ... and {} more", packages.len() - 20);
    }
    
    Ok(())
}

async fn show_package_info(package_name: &str) -> AptOstreeResult<()> {
    info!("Getting package info for: {}", package_name);
    
    let apt_manager = AptManager::new()?;
    let package_info = apt_manager.get_package_info(package_name).await?;
    
    println!("Package: {}", package_info.name);
    println!("Version: {}", package_info.version);
    println!("Architecture: {}", package_info.architecture);
    println!("Description: {}", package_info.description);
    
    if !package_info.depends.is_empty() {
        println!("Depends: {}", package_info.depends.join(", "));
    }
    
    if !package_info.conflicts.is_empty() {
        println!("Conflicts: {}", package_info.conflicts.join(", "));
    }
    
    if !package_info.provides.is_empty() {
        println!("Provides: {}", package_info.provides.join(", "));
    }
    
    Ok(())
}

async fn install_package(package_name: &str) -> AptOstreeResult<()> {
    info!("Installing package: {}", package_name);
    
    println!("=== apt-ostree install {} ===", package_name);
    println!("This is a placeholder for atomic package installation.");
    println!("");
    println!("In a real implementation, this would:");
    println!("1. Create a staging deployment from current system");
    println!("2. Install the package in the staging environment");
    println!("3. Create a new OSTree commit");
    println!("4. Deploy the new commit (requires reboot to activate)");
    println!("");
    println!("Package '{}' would be installed atomically.", package_name);
    println!("Reboot required to activate changes.");
    
    Ok(())
}

async fn remove_package(package_name: &str) -> AptOstreeResult<()> {
    info!("Removing package: {}", package_name);
    
    println!("=== apt-ostree remove {} ===", package_name);
    println!("This is a placeholder for atomic package removal.");
    println!("");
    println!("In a real implementation, this would:");
    println!("1. Create a staging deployment from current system");
    println!("2. Remove the package from the staging environment");
    println!("3. Create a new OSTree commit");
    println!("4. Deploy the new commit (requires reboot to activate)");
    println!("");
    println!("Package '{}' would be removed atomically.", package_name);
    println!("Reboot required to activate changes.");
    
    Ok(())
}

async fn upgrade_system() -> AptOstreeResult<()> {
    info!("Upgrading system");
    
    println!("=== apt-ostree upgrade ===");
    println!("This is a placeholder for atomic system upgrade.");
    println!("");
    println!("In a real implementation, this would:");
    println!("1. Create a staging deployment from current system");
    println!("2. Run 'apt upgrade' in the staging environment");
    println!("3. Create a new OSTree commit with all updates");
    println!("4. Deploy the new commit (requires reboot to activate)");
    println!("");
    println!("System would be upgraded atomically.");
    println!("Reboot required to activate changes.");
    
    Ok(())
}

async fn show_system_status() -> AptOstreeResult<()> {
    info!("Showing system status");
    
    println!("=== apt-ostree status ===");
    println!("This is a placeholder for system status.");
    println!("");
    println!("In a real implementation, this would show:");
    println!("- Current OSTree deployment");
    println!("- Available updates");
    println!("- Package installation status");
    println!("- System health information");
    println!("");
    println!("System status information would be displayed here.");
    
    Ok(())
}