use apt_pkg_native::Cache;
use tracing::info;

use crate::error::{AptOstreeError, AptOstreeResult};

/// APT package manager wrapper using apt-pkg-native
pub struct AptManager {
    cache: Cache,
}

impl AptManager {
    /// Create a new APT manager instance
    pub fn new() -> AptOstreeResult<Self> {
        info!("Initializing APT cache with apt-pkg-native");
        
        let cache = Cache::get_singleton();
        info!("APT cache initialized successfully");
        
        Ok(Self { cache })
    }
    
    /// Get package information
    pub fn get_package(&mut self, name: &str) -> AptOstreeResult<Option<Package>> {
        let packages: Vec<_> = self.cache.find_by_name(name).map(|pkg| Package::new(pkg.name(), pkg.arch())).collect();
        Ok(packages.into_iter().next())
    }
    
    /// List all packages
    pub fn list_packages(&mut self) -> Vec<Package> {
        self.cache.iter().map(|pkg| Package::new(pkg.name(), pkg.arch())).collect()
    }
    
    /// List installed packages
    pub fn list_installed_packages(&mut self) -> Vec<Package> {
        self.cache.iter()
            .filter_map(|pkg| {
                let package = Package::new(pkg.name(), pkg.arch());
                if package.is_installed() {
                    Some(package)
                } else {
                    None
                }
            })
            .collect()
    }
    
    /// Search for packages
    pub fn search_packages_sync(&mut self, query: &str) -> Vec<Package> {
        self.cache.iter()
            .filter_map(|pkg| {
                let package = Package::new(pkg.name(), pkg.arch());
                if package.name().contains(query) {
                    Some(package)
                } else {
                    None
                }
            })
            .collect()
    }
    
    /// Search for packages (async version for compatibility)
    pub async fn search_packages(&mut self, query: &str) -> AptOstreeResult<Vec<String>> {
        let packages = self.search_packages_sync(query);
        Ok(packages.into_iter().map(|pkg| pkg.name().to_string()).collect())
    }
    
    /// Enhanced search for packages with advanced options
    pub async fn search_packages_enhanced(&self, query: &str, _opts: &()) -> AptOstreeResult<Vec<()>> {
        // Simple implementation for now - just return empty results
        Ok(vec![])
    }
    
    /// Download package (placeholder implementation)
    pub async fn download_package(&self, package_name: &str) -> AptOstreeResult<std::path::PathBuf> {
        // For now, return a dummy path - this would need real implementation
        Ok(std::path::PathBuf::from(format!("/tmp/{}.deb", package_name)))
    }
    
    /// Get package info (placeholder implementation)
    pub async fn get_package_info(&self, package_name: &str) -> AptOstreeResult<PackageInfo> {
        // For now, return dummy metadata - this would need real implementation
        Ok(PackageInfo {
            name: package_name.to_string(),
            version: "1.0.0".to_string(),
            architecture: "amd64".to_string(),
            description: "Package description".to_string(),
            depends: vec![],
            conflicts: vec![],
            provides: vec![],
            scripts: std::collections::HashMap::new(),
        })
    }
    
    // Placeholder methods for compatibility
    pub async fn get_package_metadata_by_name(&self, package_name: &str) -> AptOstreeResult<PackageInfo> {
        self.get_package_info(package_name).await
    }
    
    pub async fn resolve_dependencies(&self, _packages: &[String]) -> AptOstreeResult<Vec<String>> {
        Ok(vec![])
    }
    
    pub async fn check_conflicts(&self, _packages: &[String]) -> AptOstreeResult<Vec<String>> {
        Ok(vec![])
    }
    
    pub async fn install_package(&self, _package_name: &str) -> AptOstreeResult<()> {
        Ok(())
    }
    
    pub async fn remove_package(&self, _package_name: &str) -> AptOstreeResult<()> {
        Ok(())
    }
    
    pub async fn upgrade_package(&self, _package_name: &str) -> AptOstreeResult<()> {
        Ok(())
    }
    
    pub async fn get_upgradable_packages(&self) -> AptOstreeResult<Vec<String>> {
        Ok(vec![])
    }
    
    pub async fn get_package_metadata(&self, _package: &str) -> AptOstreeResult<PackageInfo> {
        Ok(PackageInfo {
            name: "unknown".to_string(),
            version: "1.0.0".to_string(),
            architecture: "amd64".to_string(),
            description: "Package description".to_string(),
            depends: vec![],
            conflicts: vec![],
            provides: vec![],
            scripts: std::collections::HashMap::new(),
        })
    }
    
    pub async fn get_package_dependencies(&self, _package: &str) -> AptOstreeResult<Vec<String>> {
        Ok(vec![])
    }
    
    pub async fn get_reverse_dependencies(&self, _package_name: &str) -> AptOstreeResult<Vec<String>> {
        Ok(vec![])
    }
    
    pub async fn clear_cache(&self) -> AptOstreeResult<()> {
        Ok(())
    }
}

/// Simple package info structure
#[derive(Debug)]
pub struct PackageInfo {
    pub name: String,
    pub version: String,
    pub architecture: String,
    pub description: String,
    pub depends: Vec<String>,
    pub conflicts: Vec<String>,
    pub provides: Vec<String>,
    pub scripts: std::collections::HashMap<String, String>,
}

/// Package wrapper to provide compatibility with rust-apt API
pub struct Package {
    name: String,
    arch: String,
    current_version: Option<String>,
    candidate_version: Option<String>,
    installed: bool,
}

impl Package {
    fn new(name: String, arch: String) -> Self {
        Self {
            name,
            arch,
            current_version: None,
            candidate_version: None,
            installed: false,
        }
    }
    
    pub fn name(&self) -> &str {
        &self.name
    }
    
    pub fn arch(&self) -> &str {
        &self.arch
    }
    
    pub fn is_installed(&self) -> bool {
        self.installed
    }
    
    pub fn current_version(&self) -> Option<&str> {
        self.current_version.as_deref()
    }
    
    pub fn candidate_version(&self) -> Option<&str> {
        self.candidate_version.as_deref()
    }
}