apt-ostree/src/ostree_integration.rs

use std::path::Path;
use std::process::Command;
use tracing::{info, warn, error};
use crate::error::{AptOstreeError, AptOstreeResult};

/// OSTree system integration for atomic package operations
pub struct OstreeManager {
    sysroot_path: String,
    os_name: String,
    current_deployment: Option<String>,
}

impl OstreeManager {
    /// Create a new OSTree manager instance
    pub fn new() -> AptOstreeResult<Self> {
        info!("Initializing OSTree manager");
        
        // Detect if we're running in an OSTree system
        if !Path::new("/run/ostree-booted").exists() {
            return Err(AptOstreeError::Ostree("Not running in an OSTree system".to_string()));
        }
        
        // Get current deployment info
        let current_deployment = Self::get_current_deployment()?;
        let os_name = Self::get_os_name()?;
        
        info!("OSTree system detected: OS={}, Deployment={}", os_name, current_deployment);
        
        Ok(Self {
            sysroot_path: "/".to_string(),
            os_name,
            current_deployment: Some(current_deployment),
        })
    }
    
    /// Get the current deployment checksum
    fn get_current_deployment() -> AptOstreeResult<String> {
        let output = Command::new("ostree")
            .args(&["admin", "status"])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to run ostree admin status: {}", e)))?;
        
        if !output.status.success() {
            return Err(AptOstreeError::Ostree("ostree admin status failed".to_string()));
        }
        
        let output_str = String::from_utf8_lossy(&output.stdout);
        
        // Parse the output to find the current deployment
        // Example output: "* debian 1234567890abcdef.0 (pending)"
        for line in output_str.lines() {
            if line.starts_with('*') {
                let parts: Vec<&str> = line.split_whitespace().collect();
                if parts.len() >= 3 {
                    return Ok(parts[2].to_string());
                }
            }
        }
        
        Err(AptOstreeError::Ostree("Could not parse current deployment".to_string()))
    }
    
    /// Get the OS name from OSTree
    fn get_os_name() -> AptOstreeResult<String> {
        let output = Command::new("ostree")
            .args(&["admin", "status"])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to run ostree admin status: {}", e)))?;
        
        if !output.status.success() {
            return Err(AptOstreeError::Ostree("ostree admin status failed".to_string()));
        }
        
        let output_str = String::from_utf8_lossy(&output.stdout);
        
        // Parse the output to find the OS name
        for line in output_str.lines() {
            if line.starts_with('*') {
                let parts: Vec<&str> = line.split_whitespace().collect();
                if parts.len() >= 2 {
                    return Ok(parts[1].to_string());
                }
            }
        }
        
        Err(AptOstreeError::Ostree("Could not parse OS name".to_string()))
    }
    
    /// Create a staging deployment from the current system
    pub fn create_staging_deployment(&self) -> AptOstreeResult<String> {
        info!("Creating staging deployment from current system");
        
        let current_deployment = self.current_deployment.as_ref()
            .ok_or_else(|| AptOstreeError::Ostree("No current deployment available".to_string()))?;
        
        // Create a staging deployment using ostree admin deploy
        let staging_ref = format!("{}:staging", self.os_name);
        
        let output = Command::new("ostree")
            .args(&["admin", "deploy", "--stage", &staging_ref])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to create staging deployment: {}", e)))?;
        
        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stderr);
            return Err(AptOstreeError::Ostree(format!("Failed to create staging deployment: {}", stderr)));
        }
        
        info!("Staging deployment created successfully");
        Ok(staging_ref)
    }
    
    /// Install packages in the staging environment
    pub fn install_packages_in_staging(&self, packages: &[String]) -> AptOstreeResult<()> {
        info!("Installing packages in staging environment: {:?}", packages);
        
        // Create staging deployment first
        let staging_ref = self.create_staging_deployment()?;
        
        // Install packages using apt in the staging environment
        // This would require chrooting into the staging deployment
        // For now, we'll simulate the process
        
        info!("Packages would be removed from staging environment: {:?}", packages);
        info!("Staging deployment: {}", staging_ref);
        
        Ok(())
    }
    
    /// Remove packages from the staging environment
    pub fn remove_packages_from_staging(&self, packages: &[String]) -> AptOstreeResult<()> {
        info!("Removing packages from staging environment: {:?}", packages);
        
        // Create staging deployment first
        let staging_ref = self.create_staging_deployment()?;
        
        // Remove packages using apt in the staging environment
        // This would require chrooting into the staging deployment
        // For now, we'll simulate the process
        
        info!("Packages would be removed from staging environment: {:?}", packages);
        info!("Staging deployment: {}", staging_ref);
        
        Ok(())
    }
    
    /// Upgrade all packages in the staging environment
    pub fn upgrade_packages_in_staging(&self) -> AptOstreeResult<()> {
        info!("Upgrading packages in staging environment");
        
        // Create staging deployment first
        let staging_ref = self.create_staging_deployment()?;
        
        // Upgrade packages using apt in the staging environment
        // This would require chrooting into the staging deployment
        // For now, we'll simulate the process
        
        info!("Packages would be upgraded in staging environment");
        info!("Staging deployment: {}", staging_ref);
        
        Ok(())
    }
    
    /// Commit the staging deployment to create a new OSTree commit
    pub fn commit_staging_deployment(&self, commit_message: &str) -> AptOstreeResult<String> {
        info!("Committing staging deployment with message: {}", commit_message);
        
        // This would require:
        // 1. Finalizing the staging deployment
        // 2. Creating a new OSTree commit
        // 3. Updating the deployment references
        
        // For now, we'll simulate the process
        let new_commit = format!("{}_new_commit", self.os_name);
        
        info!("Staging deployment would be committed as: {}", new_commit);
        info!("Commit message: {}", commit_message);
        
        Ok(new_commit)
    }
    
    /// Deploy the new commit (requires reboot to activate)
    pub fn deploy_new_commit(&self, commit_ref: &str) -> AptOstreeResult<()> {
        info!("Deploying new commit: {}", commit_ref);
        
        // This would require:
        // 1. Setting the new commit as the pending deployment
        // 2. Updating the bootloader configuration
        // 3. Preparing for reboot
        
        info!("New commit would be deployed: {}", commit_ref);
        info!("Reboot required to activate changes");
        
        Ok(())
    }
    
    /// Get system status information
    pub fn get_system_status(&self) -> AptOstreeResult<String> {
        info!("Getting OSTree system status");
        
        let output = Command::new("ostree")
            .args(&["admin", "status"])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to get system status: {}", e)))?;
        
        if !output.status.success() {
            return Err(AptOstreeError::Ostree("Failed to get system status".to_string()));
        }
        
        let status = String::from_utf8_lossy(&output.stdout);
        info!("System status retrieved successfully");
        
        Ok(status.to_string())
    }
    
    /// Check if a rollback is available
    pub fn check_rollback_available(&self) -> AptOstreeResult<bool> {
        info!("Checking if rollback is available");
        
        let output = Command::new("ostree")
            .args(&["admin", "status"])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to check rollback status: {}", e)))?;
        
        if !output.status.success() {
            return Err(AptOstreeError::Ostree("Failed to check rollback status".to_string()));
        }
        
        let status = String::from_utf8_lossy(&output.stdout);
        
        // Check if there are multiple deployments available
        let deployment_count = status.lines()
            .filter(|line| line.starts_with('*') || line.starts_with(' '))
            .count();
        
        let rollback_available = deployment_count > 1;
        info!("Rollback available: {}", rollback_available);
        
        Ok(rollback_available)
    }
    
    /// Rollback to the previous deployment
    pub fn rollback_to_previous(&self) -> AptOstreeResult<()> {
        info!("Rolling back to previous deployment");
        
        let output = Command::new("ostree")
            .args(&["admin", "rollback"])
            .output()
            .map_err(|e| AptOstreeError::Ostree(format!("Failed to rollback: {}", e)))?;
        
        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stdout);
            return Err(AptOstreeError::Ostree(format!("Failed to rollback: {}", stderr)));
        }
        
        info!("Rollback completed successfully");
        info!("Reboot required to activate rollback");
        
        Ok(())
    }
}