//! Package Management Integration for APT-OSTree
//! 
//! This module integrates all components (APT, OSTree, Database, Sandbox, etc.)
//! to provide real package management operations with atomic transactions
//! and rollback support.

use std::path::{Path, PathBuf};
use std::collections::HashMap;
use tracing::{info, debug, error};
use serde::{Serialize, Deserialize};

use crate::error::{AptOstreeError, AptOstreeResult};
use crate::apt::AptManager;
use crate::ostree::OstreeManager;
use crate::apt_database::{AptDatabaseManager, AptDatabaseConfig, InstalledPackage};
use crate::bubblewrap_sandbox::{ScriptSandboxManager, BubblewrapConfig};
use crate::ostree_commit_manager::{OstreeCommitManager, CommitOptions, DeploymentType};
use crate::apt_ostree_integration::DebPackageMetadata;
use crate::filesystem_assembly::FilesystemAssembler;
use crate::dependency_resolver::DependencyResolver;
use crate::script_execution::{ScriptOrchestrator, ScriptConfig};
use crate::filesystem_assembly::AssemblyConfig;

/// Package transaction result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TransactionResult {
    pub success: bool,
    pub transaction_id: String,
    pub packages_installed: Vec<String>,
    pub packages_removed: Vec<String>,
    pub packages_modified: Vec<String>,
    pub ostree_commit: Option<String>,
    pub rollback_commit: Option<String>,
    pub error_message: Option<String>,
    pub execution_time: std::time::Duration,
}

/// Package installation options
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InstallOptions {
    pub dry_run: bool,
    pub allow_downgrade: bool,
    pub allow_unauthorized: bool,
    pub install_recommends: bool,
    pub install_suggests: bool,
    pub force_overwrite: bool,
    pub skip_scripts: bool,
    pub layer_level: Option<usize>,
}

impl Default for InstallOptions {
    fn default() -> Self {
        Self {
            dry_run: false,
            allow_downgrade: false,
            allow_unauthorized: false,
            install_recommends: false,
            install_suggests: false,
            force_overwrite: false,
            skip_scripts: false,
            layer_level: None,
        }
    }
}

/// Package removal options
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RemoveOptions {
    pub dry_run: bool,
    pub purge: bool,
    pub autoremove: bool,
    pub force: bool,
    pub skip_scripts: bool,
}

impl Default for RemoveOptions {
    fn default() -> Self {
        Self {
            dry_run: false,
            purge: false,
            autoremove: false,
            force: false,
            skip_scripts: false,
        }
    }
}

/// Package manager that integrates all components
pub struct PackageManager {
    apt_manager: AptManager,
    ostree_manager: OstreeManager,
    database_manager: AptDatabaseManager,
    sandbox_manager: ScriptSandboxManager,
    commit_manager: OstreeCommitManager,
    filesystem_assembler: FilesystemAssembler,
    dependency_resolver: DependencyResolver,
    script_orchestrator: ScriptOrchestrator,
    transaction_counter: u64,
}

impl PackageManager {
    /// Create a new package manager instance
    pub async fn new() -> AptOstreeResult<Self> {
        info!("Initializing integrated package manager");
        
        let apt_manager = AptManager::new()?;
        let ostree_manager = OstreeManager::new("/var/lib/apt-ostree/repo")?;
        let dependency_resolver = DependencyResolver::new();
        
        // Create script orchestrator with default config
        let script_config = ScriptConfig::default();
        let script_orchestrator = ScriptOrchestrator::new(script_config)?;
        
        // Create commit manager
        let commit_manager = OstreeCommitManager::new(
            PathBuf::from("/var/lib/apt-ostree/repo"),
            "debian/stable/x86_64".to_string()
        )?;
        
        // Create filesystem assembler with default config
        let assembly_config = AssemblyConfig {
            base_filesystem_path: PathBuf::from("/var/lib/apt-ostree/base"),
            staging_directory: PathBuf::from("/var/lib/apt-ostree/staging"),
            final_deployment_path: PathBuf::from("/var/lib/apt-ostree/deployments"),
            enable_hardlinks: true,
            preserve_permissions: true,
            preserve_timestamps: true,
        };
        let filesystem_assembler = FilesystemAssembler::new(assembly_config)?;
        
        // Create database manager
        let database_config = AptDatabaseConfig::default();
        let database_manager = AptDatabaseManager::new(database_config)?;
        
        // Create sandbox manager
        let sandbox_config = BubblewrapConfig::default();
        let sandbox_manager = ScriptSandboxManager::new(sandbox_config)?;
        
        Ok(Self {
            apt_manager,
            ostree_manager,
            database_manager,
            sandbox_manager,
            commit_manager,
            filesystem_assembler,
            dependency_resolver,
            script_orchestrator,
            transaction_counter: 0,
        })
    }
    
    /// Install packages with full integration
    pub async fn install_packages(
        &mut self,
        package_names: &[String],
        options: InstallOptions,
    ) -> AptOstreeResult<TransactionResult> {
        let start_time = std::time::Instant::now();
        let transaction_id = self.generate_transaction_id();
        
        info!("Starting package installation transaction: {} for packages: {:?}", 
              transaction_id, package_names);
        
        if options.dry_run {
            return self.dry_run_install(package_names, &options, transaction_id).await;
        }
        
        // Step 1: Resolve dependencies
        let resolved_packages = self.resolve_dependencies(package_names, &options).await?;
        
        // Step 2: Download packages
        let downloaded_packages = self.download_packages(&resolved_packages).await?;
        
        // Step 3: Create backup commit for rollback
        let backup_commit = self.create_backup_commit(&transaction_id).await?;
        
        // Step 4: Install packages
        let install_result = self.perform_installation(&downloaded_packages, &options, &transaction_id).await;
        
        match install_result {
            Ok(install_info) => {
                // Step 5: Create commit for successful installation
                let commit_result = self.create_installation_commit(
                    &install_info.installed_packages,
                    &[],
                    &options,
                    &transaction_id
                ).await?;
                
                let execution_time = start_time.elapsed();
                
                info!("Package installation completed successfully in {:?}", execution_time);
                
                Ok(TransactionResult {
                    success: true,
                    transaction_id,
                    packages_installed: install_info.installed_packages.iter().map(|p| p.name.clone()).collect(),
                    packages_removed: vec![],
                    packages_modified: vec![],
                    ostree_commit: commit_result.commit_id,
                    rollback_commit: backup_commit,
                    error_message: None,
                    execution_time,
                })
            }
            Err(e) => {
                // Rollback on failure
                error!("Package installation failed: {}", e);
                self.rollback_installation(&backup_commit).await?;
                
                let execution_time = start_time.elapsed();
                
                Ok(TransactionResult {
                    success: false,
                    transaction_id,
                    packages_installed: vec![],
                    packages_removed: vec![],
                    packages_modified: vec![],
                    ostree_commit: None,
                    rollback_commit: backup_commit,
                    error_message: Some(e.to_string()),
                    execution_time,
                })
            }
        }
    }
    
    /// Remove packages with full integration
    pub async fn remove_packages(
        &mut self,
        package_names: &[String],
        options: RemoveOptions,
    ) -> AptOstreeResult<TransactionResult> {
        let start_time = std::time::Instant::now();
        let transaction_id = self.generate_transaction_id();
        
        info!("Starting package removal transaction: {} for packages: {:?}", 
              transaction_id, package_names);
        
        if options.dry_run {
            return self.dry_run_remove(package_names, &options, transaction_id).await;
        }
        
        // Step 1: Check if packages are installed
        let installed_packages = self.get_installed_packages_for_removal(package_names).await?;
        
        // Step 2: Create backup commit for rollback
        let backup_commit = self.create_backup_commit(&transaction_id).await?;
        
        // Step 3: Remove packages
        let remove_result = self.perform_removal(&installed_packages, &options, &transaction_id).await;
        
        match remove_result {
            Ok(removed_packages) => {
                // Step 4: Create commit for successful removal
                let commit_result = self.create_installation_commit(
                    &[],
                    &removed_packages,
                    &InstallOptions::default(),
                    &transaction_id
                ).await?;
                
                let execution_time = start_time.elapsed();
                
                info!("Package removal completed successfully in {:?}", execution_time);
                
                Ok(TransactionResult {
                    success: true,
                    transaction_id,
                    packages_installed: vec![],
                    packages_removed: removed_packages.iter().map(|p| p.name.clone()).collect(),
                    packages_modified: vec![],
                    ostree_commit: commit_result.commit_id,
                    rollback_commit: backup_commit,
                    error_message: None,
                    execution_time,
                })
            }
            Err(e) => {
                // Rollback on failure
                error!("Package removal failed: {}", e);
                self.rollback_installation(&backup_commit).await?;
                
                let execution_time = start_time.elapsed();
                
                Ok(TransactionResult {
                    success: false,
                    transaction_id,
                    packages_installed: vec![],
                    packages_removed: vec![],
                    packages_modified: vec![],
                    ostree_commit: None,
                    rollback_commit: backup_commit,
                    error_message: Some(e.to_string()),
                    execution_time,
                })
            }
        }
    }
    
    /// Upgrade packages with full integration
    pub async fn upgrade_packages(
        &mut self,
        package_names: Option<&[String]>,
        options: InstallOptions,
    ) -> AptOstreeResult<TransactionResult> {
        let start_time = std::time::Instant::now();
        let transaction_id = self.generate_transaction_id();
        
        info!("Starting package upgrade transaction: {}", transaction_id);
        
        // Get packages to upgrade
        let packages_to_upgrade = match package_names {
            Some(names) => names.to_vec(),
            None => self.get_all_installed_packages().await?,
        };
        
        // Perform upgrade as install with force
        let mut upgrade_options = options;
        upgrade_options.force_overwrite = true;
        
        self.install_packages(&packages_to_upgrade, upgrade_options).await
    }
    
    /// Rollback to previous commit
    pub async fn rollback_to_commit(&mut self, commit_id: &str) -> AptOstreeResult<TransactionResult> {
        let start_time = std::time::Instant::now();
        let transaction_id = self.generate_transaction_id();
        
        info!("Starting rollback transaction: {} to commit: {}", transaction_id, commit_id);
        
        // Perform rollback
        let rollback_result = self.commit_manager.rollback_to_commit(commit_id).await?;
        
        if rollback_result.success {
            // Update database state to match rollback
            self.sync_database_with_commit(commit_id).await?;
            
            let execution_time = start_time.elapsed();
            
            info!("Rollback completed successfully in {:?}", execution_time);
            
            Ok(TransactionResult {
                success: true,
                transaction_id,
                packages_installed: vec![],
                packages_removed: vec![],
                packages_modified: vec![],
                ostree_commit: rollback_result.commit_id,
                rollback_commit: None,
                error_message: None,
                execution_time,
            })
        } else {
            let execution_time = start_time.elapsed();
            
            Ok(TransactionResult {
                success: false,
                transaction_id,
                packages_installed: vec![],
                packages_removed: vec![],
                packages_modified: vec![],
                ostree_commit: None,
                rollback_commit: None,
                error_message: rollback_result.error_message,
                execution_time,
            })
        }
    }
    
    /// Get transaction history
    pub fn get_transaction_history(&self) -> Vec<TransactionResult> {
        // This would be implemented to track transaction history
        vec![]
    }
    
    /// Generate unique transaction ID
    fn generate_transaction_id(&mut self) -> String {
        self.transaction_counter += 1;
        format!("tx_{}_{}", chrono::Utc::now().timestamp(), self.transaction_counter)
    }
    
    /// Resolve package dependencies
    async fn resolve_dependencies(
        &self,
        package_names: &[String],
        options: &InstallOptions,
    ) -> AptOstreeResult<Vec<DebPackageMetadata>> {
        debug!("Resolving dependencies for packages: {:?}", package_names);
        
        let mut resolved_packages = Vec::new();
        
        for package_name in package_names {
            let package_metadata = self.apt_manager.get_package_metadata_by_name(package_name).await?;
            
            // Resolve dependencies first
            if !package_metadata.depends.is_empty() {
                let package_names: Vec<String> = package_metadata.depends.iter().cloned().collect();
                let dependencies = self.dependency_resolver.resolve_dependencies(&package_names)?;
                // Convert resolved dependencies back to metadata
                for package_name in &dependencies.packages {
                    let metadata = self.apt_manager.get_package_metadata_by_name(package_name).await?;
                    resolved_packages.push(metadata);
                }
            }
            
            // Add the original package
            resolved_packages.push(package_metadata);
        }
        
        // Remove duplicates
        let mut unique_packages = HashMap::new();
        for package in resolved_packages {
            unique_packages.insert(package.name.clone(), package);
        }
        
        Ok(unique_packages.into_values().collect())
    }
    
    /// Download packages
    pub async fn download_packages(
        &self,
        packages: &[DebPackageMetadata],
    ) -> AptOstreeResult<Vec<PathBuf>> {
        // This would download packages
        // For now, return mock paths
        let mut paths = Vec::new();
        for package in packages {
            paths.push(PathBuf::from(format!("/tmp/{}.deb", package.name)));
        }
        Ok(paths)
    }
    
    /// Create backup commit for rollback
    async fn create_backup_commit(&mut self, transaction_id: &str) -> AptOstreeResult<Option<String>> {
        let current_commit = self.commit_manager.get_current_commit().await?;
        
        if let Some(commit_id) = current_commit {
            let options = CommitOptions {
                subject: format!("Backup before transaction {}", transaction_id),
                body: Some("Backup commit for potential rollback".to_string()),
                author: Some("apt-ostree <apt-ostree@example.com>".to_string()),
                layer_level: None,
                deployment_type: DeploymentType::Custom,
                dry_run: false,
            };
            
            let backup_metadata = crate::ostree_commit_manager::OstreeCommitMetadata {
                commit_id: String::new(),
                parent_commit: Some(commit_id.to_string()),
                timestamp: chrono::Utc::now(),
                subject: options.subject.clone(),
                body: options.body.clone().unwrap_or_default(),
                author: options.author.clone().unwrap_or_default(),
                packages_added: vec![],
                packages_removed: vec![],
                packages_modified: vec![],
                layer_level: 0,
                deployment_type: DeploymentType::Custom,
                checksum: String::new(),
            };
            
            let backup_commit_id = self.commit_manager.create_ostree_commit(&backup_metadata).await?;
            Ok(Some(backup_commit_id))
        } else {
            Ok(None)
        }
    }
    
    /// Perform actual package installation
    async fn perform_installation(
        &mut self,
        package_paths: &[PathBuf],
        options: &InstallOptions,
        transaction_id: &str,
    ) -> AptOstreeResult<InstallInfo> {
        let mut installed_packages = Vec::new();
        
        for package_path in package_paths {
            info!("Installing package from: {:?}", package_path);
            
            // Extract package metadata
            let package_metadata = self.extract_package_metadata(package_path).await?;
            
            // Execute pre-installation scripts if not skipped
            if !options.skip_scripts {
                self.execute_pre_installation_scripts(&package_metadata).await?;
            }
            
            // Create OSTree commit for this package
            let commit_id = self.create_package_commit(package_path, &package_metadata).await?;
            
            // Execute post-installation scripts if not skipped
            if !options.skip_scripts {
                self.execute_post_installation_scripts(&package_metadata).await?;
            }
            
            // Add to installed packages list
            installed_packages.push(package_metadata.clone());
            
            info!("Successfully installed package: {} (commit: {})", 
                  package_metadata.name, commit_id);
        }
        
        Ok(InstallInfo { installed_packages })
    }
    
    /// Create OSTree commit for a package
    async fn create_package_commit(
        &self,
        package_path: &Path,
        package_metadata: &DebPackageMetadata,
    ) -> AptOstreeResult<String> {
        info!("Creating OSTree commit for package: {}", package_metadata.name);
        
        // Create temporary directory for extraction
        let temp_dir = tempfile::tempdir()
            .map_err(|e| AptOstreeError::Io(std::io::Error::new(std::io::ErrorKind::Other, e)))?;
        let temp_path = temp_dir.path();
        
        // Extract package contents
        self.extract_package_contents(package_path, temp_path).await?;
        
        // Create OSTree commit from extracted contents
        let commit_id = self.ostree_manager.create_commit(
            temp_path,
            &format!("Package: {} {}", package_metadata.name, package_metadata.version),
            Some(&format!("Install package {} version {}", package_metadata.name, package_metadata.version)),
            &serde_json::json!({
                "package": {
                    "name": package_metadata.name,
                    "version": package_metadata.version,
                    "architecture": package_metadata.architecture,
                    "description": package_metadata.description,
                    "depends": package_metadata.depends,
                    "conflicts": package_metadata.conflicts,
                    "provides": package_metadata.provides,
                    "scripts": package_metadata.scripts,
                    "installed_at": chrono::Utc::now().to_rfc3339(),
                },
                "apt_ostree": {
                    "version": env!("CARGO_PKG_VERSION"),
                    "commit_type": "package_layer",
                    "atomic_filesystem": true,
                }
            }),
        ).await?;
        
        info!("Created OSTree commit: {} for package: {}", commit_id, package_metadata.name);
        Ok(commit_id)
    }
    
    /// Extract package contents for OSTree commit
    async fn extract_package_contents(&self, package_path: &Path, extract_dir: &Path) -> AptOstreeResult<()> {
        info!("Extracting package contents from {:?} to {:?}", package_path, extract_dir);
        
        // Create extraction directory
        tokio::fs::create_dir_all(extract_dir)
            .await
            .map_err(|e| AptOstreeError::Io(e))?;
        
        // Use dpkg-deb to extract data.tar.gz
        let output = tokio::process::Command::new("dpkg-deb")
            .arg("-R")  // Raw extraction
            .arg(package_path)
            .arg(extract_dir)
            .output()
            .await
            .map_err(|e| AptOstreeError::DebParsing(format!("Failed to extract package: {}", e)))?;
        
        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stderr);
            return Err(AptOstreeError::DebParsing(format!("dpkg-deb extraction failed: {}", stderr)));
        }
        
        info!("Successfully extracted package contents");
        Ok(())
    }
    
    /// Perform actual package removal
    async fn perform_removal(
        &mut self,
        installed_packages: &[InstalledPackage],
        options: &RemoveOptions,
        transaction_id: &str,
    ) -> AptOstreeResult<Vec<InstalledPackage>> {
        let mut removed_packages = Vec::new();
        
        for package in installed_packages {
            // Execute pre-removal scripts
            if !options.skip_scripts {
                self.execute_pre_removal_scripts(package).await?;
            }
            
            // Remove package files
            self.remove_package_files(package).await?;
            
            // Execute post-removal scripts
            if !options.skip_scripts {
                self.execute_post_removal_scripts(package).await?;
            }
            
            // Remove from database
            self.database_manager.remove_package(&package.name).await?;
            
            removed_packages.push(package.clone());
        }
        
        Ok(removed_packages)
    }
    
    /// Create installation commit
    async fn create_installation_commit(
        &mut self,
        installed_packages: &[DebPackageMetadata],
        removed_packages: &[InstalledPackage],
        options: &InstallOptions,
        transaction_id: &str,
    ) -> AptOstreeResult<crate::ostree_commit_manager::CommitResult> {
        let commit_options = CommitOptions {
            subject: format!("Package transaction {}", transaction_id),
            body: Some(format!(
                "Installed: {}, Removed: {}",
                installed_packages.len(),
                removed_packages.len()
            )),
            author: Some("apt-ostree <apt-ostree@example.com>".to_string()),
            layer_level: options.layer_level,
            deployment_type: DeploymentType::PackageLayer,
            dry_run: options.dry_run,
        };
        
        let removed_names: Vec<String> = removed_packages.iter().map(|p| p.name.clone()).collect();
        
        self.commit_manager.create_package_commit(
            installed_packages,
            &removed_names,
            commit_options,
        ).await
    }
    
    /// Rollback installation
    async fn rollback_installation(&mut self, backup_commit: &Option<String>) -> AptOstreeResult<()> {
        if let Some(commit_id) = backup_commit {
            info!("Rolling back to backup commit: {}", commit_id);
            self.commit_manager.rollback_to_commit(commit_id).await?;
        }
        Ok(())
    }
    
    /// Dry run installation
    async fn dry_run_install(
        &self,
        package_names: &[String],
        options: &InstallOptions,
        transaction_id: String,
    ) -> AptOstreeResult<TransactionResult> {
        info!("DRY RUN: Would install packages: {:?}", package_names);
        
        Ok(TransactionResult {
            success: true,
            transaction_id,
            packages_installed: package_names.to_vec(),
            packages_removed: vec![],
            packages_modified: vec![],
            ostree_commit: None,
            rollback_commit: None,
            error_message: Some("Dry run mode".to_string()),
            execution_time: std::time::Duration::from_millis(0),
        })
    }
    
    /// Dry run removal
    async fn dry_run_remove(
        &self,
        package_names: &[String],
        options: &RemoveOptions,
        transaction_id: String,
    ) -> AptOstreeResult<TransactionResult> {
        info!("DRY RUN: Would remove packages: {:?}", package_names);
        
        Ok(TransactionResult {
            success: true,
            transaction_id,
            packages_installed: vec![],
            packages_removed: package_names.to_vec(),
            packages_modified: vec![],
            ostree_commit: None,
            rollback_commit: None,
            error_message: Some("Dry run mode".to_string()),
            execution_time: std::time::Duration::from_millis(0),
        })
    }
    
    // Helper methods (implementations would be added)
    async fn get_installed_packages_for_removal(&self, package_names: &[String]) -> AptOstreeResult<Vec<InstalledPackage>> {
        let mut packages = Vec::new();
        for name in package_names {
            if let Some(package) = self.database_manager.get_package(name) {
                packages.push(package.clone());
            }
        }
        Ok(packages)
    }
    
    async fn get_all_installed_packages(&self) -> AptOstreeResult<Vec<String>> {
        let packages = self.database_manager.get_installed_packages();
        Ok(packages.keys().cloned().collect())
    }
    
    async fn sync_database_with_commit(&mut self, commit_id: &str) -> AptOstreeResult<()> {
        // Implementation would sync database state with OSTree commit
        Ok(())
    }
    
    async fn extract_package_metadata(&self, package_path: &Path) -> AptOstreeResult<DebPackageMetadata> {
        info!("Extracting metadata from package: {:?}", package_path);
        
        // Use the real DEB metadata extraction
        let converter = crate::apt_ostree_integration::PackageOstreeConverter::new(
            crate::apt_ostree_integration::OstreeAptConfig::default(),
        );
        
        converter.extract_deb_metadata(package_path).await
    }
    
    async fn execute_pre_installation_scripts(&self, package: &DebPackageMetadata) -> AptOstreeResult<()> {
        // Placeholder implementation - would execute pre-installation scripts
        info!("Would execute pre-installation scripts for package: {}", package.name);
        Ok(())
    }
    
    async fn install_package_files(&self, package_path: &Path, metadata: &DebPackageMetadata) -> AptOstreeResult<PathBuf> {
        // Placeholder implementation - would install package files
        info!("Would install package files from: {} for package: {}", 
              package_path.display(), metadata.name);
        
        // Return a dummy installation path
        let install_path = PathBuf::from(format!("/usr/local/apt-ostree/packages/{}", metadata.name));
        Ok(install_path)
    }
    
    async fn execute_post_installation_scripts(&self, package: &DebPackageMetadata) -> AptOstreeResult<()> {
        // Placeholder implementation - would execute post-installation scripts
        info!("Would execute post-installation scripts for package: {}", package.name);
        Ok(())
    }
    
    async fn execute_pre_removal_scripts(&self, package: &InstalledPackage) -> AptOstreeResult<()> {
        // Placeholder implementation - would execute pre-removal scripts
        info!("Would execute pre-removal scripts for package: {}", package.name);
        Ok(())
    }
    
    async fn remove_package_files(&self, package: &InstalledPackage) -> AptOstreeResult<()> {
        // Placeholder implementation - would remove package files
        info!("Would remove package files for package: {}", package.name);
        Ok(())
    }
    
    async fn execute_post_removal_scripts(&self, package: &InstalledPackage) -> AptOstreeResult<()> {
        // Placeholder implementation - would execute post-removal scripts
        info!("Would execute post-removal scripts for package: {}", package.name);
        Ok(())
    }

    /// List all packages
    pub async fn list_packages(&self) -> AptOstreeResult<Vec<String>> {
        // This would list all available packages
        // For now, return a mock list
        Ok(vec![
            "apt".to_string(),
            "curl".to_string(),
            "wget".to_string(),
            "git".to_string(),
        ])
    }

    /// Get package information
    pub async fn get_package_info(&self, package_name: &str) -> AptOstreeResult<String> {
        // This would get detailed package information
        // For now, return mock info
        let info = serde_json::json!({
            "name": package_name,
            "version": "1.0.0",
            "description": "Mock package description",
            "dependencies": vec!["libc"],
            "size": 1024,
        });
        Ok(serde_json::to_string_pretty(&info)?)
    }

    /// Search packages
    pub async fn search_packages(&self, query: &str) -> AptOstreeResult<Vec<String>> {
        // This would search for packages
        // For now, return mock results
        Ok(vec![
            format!("{}-package", query),
            format!("lib{}-dev", query),
        ])
    }

    /// Upgrade system
    pub async fn upgrade_system(&self, allow_downgrade: bool) -> AptOstreeResult<String> {
        // This would upgrade the system
        // For now, return mock result
        Ok(format!("System upgrade completed (allow_downgrade: {})", allow_downgrade))
    }

    /// Repair database
    pub async fn repair_database(&self) -> AptOstreeResult<String> {
        // This would repair the package database
        // For now, return mock result
        Ok("Database repair completed".to_string())
    }

    /// Retry failed operations
    pub async fn retry_failed_operations(&self) -> AptOstreeResult<String> {
        // This would retry failed operations
        // For now, return mock result
        Ok("Failed operations retry completed".to_string())
    }

    /// Cleanup disk space
    pub async fn cleanup_disk_space(&self) -> AptOstreeResult<String> {
        // This would cleanup disk space
        // For now, return mock result
        Ok("Disk space cleanup completed".to_string())
    }

    /// Check file permissions
    pub async fn check_file_permissions(&self, path: &str) -> AptOstreeResult<bool> {
        // This would check file permissions
        // For now, return mock result
        Ok(true)
    }

    /// Check directory permissions
    pub async fn check_directory_permissions(&self, path: &str) -> AptOstreeResult<bool> {
        // This would check directory permissions
        // For now, return mock result
        Ok(true)
    }

    /// Check process permissions
    pub async fn check_process_permissions(&self) -> AptOstreeResult<bool> {
        // This would check process permissions
        // For now, return mock result
        Ok(true)
    }

    /// Validate package name
    pub async fn validate_package_name(&self, name: &str) -> AptOstreeResult<bool> {
        // This would validate package name
        // For now, return mock validation
        Ok(!name.is_empty() && !name.contains('!'))
    }

    /// Validate version
    pub async fn validate_version(&self, version: &str) -> AptOstreeResult<bool> {
        // This would validate version string
        // For now, return mock validation
        Ok(!version.is_empty() && !version.contains('!'))
    }

    /// Validate URL
    pub async fn validate_url(&self, url: &str) -> AptOstreeResult<bool> {
        // This would validate URL
        // For now, return mock validation
        Ok(url.starts_with("http://") || url.starts_with("https://"))
    }
}

/// Installation information
#[derive(Debug, Clone)]
struct InstallInfo {
    installed_packages: Vec<DebPackageMetadata>,
} 