apt-dnf-bridge-workspace/apt-dnf-bridge-advanced/src/backend/libapt_backend.rs

//! LibApt backend implementation using libapt-pkg bindings.
//! 
//! This is a placeholder implementation that would use apt-rs or direct libapt-pkg bindings
//! when available. Currently, it falls back to shell commands.

use crate::backend::{AptBackend, BackendConfig, BackendStats, QueryOptions, RepositoryInfo, Resolution};
use apt_dnf_bridge_core::{AptError, Operation, Package, Result};
use async_trait::async_trait;

/// LibApt backend that uses libapt-pkg bindings.
/// 
/// This backend provides more accurate dependency resolution and better performance
/// than the shell backend, but requires libapt-pkg to be available.
pub struct LibAptBackend {
    config: BackendConfig,
    stats: BackendStats,
    // TODO: Add libapt-pkg specific fields when implementing
}

impl LibAptBackend {
    /// Create a new libapt backend.
    pub fn new(config: BackendConfig) -> Self {
        Self {
            config,
            stats: BackendStats {
                commands_executed: 0,
                packages_queried: 0,
                transactions_committed: 0,
                cache_hit_rate: 0.0,
                avg_command_time_ms: 0.0,
            },
        }
    }
}

#[async_trait]
impl AptBackend for LibAptBackend {
    fn name(&self) -> &'static str {
        "libapt"
    }

    fn version(&self) -> &'static str {
        "0.1.0-placeholder"
    }

    async fn is_available(&self) -> Result<bool> {
        // TODO: Check if libapt-pkg is available
        // For now, always return false to indicate it's not implemented
        Ok(false)
    }

    async fn resolve(&self, _operations: &[Operation]) -> Result<Resolution> {
        // TODO: Use libapt-pkg for proper dependency resolution
        // For now, return a placeholder response
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn commit(&self, _operations: &[Operation]) -> Result<()> {
        // TODO: Use libapt-pkg for transaction execution
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn search_packages(&mut self, _pattern: &str, _options: &QueryOptions) -> Result<Vec<Package>> {
        // TODO: Use libapt-pkg for package searching
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn get_package_info(&mut self, _name: &str, _options: &QueryOptions) -> Result<Option<Package>> {
        // TODO: Use libapt-pkg for package info
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn is_package_installed(&self, _name: &str) -> Result<bool> {
        // TODO: Use libapt-pkg for installation check
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn get_installed_packages(&self, _options: &QueryOptions) -> Result<Vec<Package>> {
        // TODO: Use libapt-pkg for installed packages
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn add_repository(&self, _repo: &RepositoryInfo) -> Result<()> {
        // TODO: Use libapt-pkg for repository management
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn remove_repository(&self, _name: &str) -> Result<()> {
        // TODO: Use libapt-pkg for repository management
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn list_repositories(&self) -> Result<Vec<RepositoryInfo>> {
        // TODO: Use libapt-pkg for repository listing
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn update_cache(&self) -> Result<()> {
        // TODO: Use libapt-pkg for cache updates
        Err(AptError::Generic(anyhow::anyhow!(
            "LibApt backend not yet implemented. Use shell backend instead."
        )))
    }

    async fn get_stats(&self) -> Result<BackendStats> {
        Ok(self.stats.clone())
    }
}