dx-forge 0.1.3

//! Generated code tracking system
//!
//! Tracks files generated by DX tools for cleanup and dependency management.

use anyhow::{Context, Result};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};
use std::collections::HashMap;
use std::path::{Path, PathBuf};

use crate::storage::Database;

/// Information about a generated file
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GeneratedFileInfo {
    /// Path to the generated file
    pub file_path: PathBuf,
    
    /// Name of the tool that generated this file
    pub tool_name: String,
    
    /// When the file was generated
    pub generated_at: DateTime<Utc>,
    
    /// SHA-256 hash of the file content when generated
    pub source_hash: String,
    
    /// Additional metadata about the generation
    pub metadata: HashMap<String, String>,
    
    /// Whether the file has been modified since generation
    pub modified: bool,
}

impl GeneratedFileInfo {
    /// Create new generated file info
    pub fn new(
        file_path: PathBuf,
        tool_name: String,
        source_hash: String,
        metadata: HashMap<String, String>,
    ) -> Self {
        Self {
            file_path,
            tool_name,
            generated_at: Utc::now(),
            source_hash,
            metadata,
            modified: false,
        }
    }
    
    /// Check if file has been modified since generation
    pub async fn check_modified(&mut self) -> Result<bool> {
        if !self.file_path.exists() {
            self.modified = true;
            return Ok(true);
        }
        
        let content = tokio::fs::read(&self.file_path).await?;
        let mut hasher = Sha256::new();
        hasher.update(&content);
        let current_hash = format!("{:x}", hasher.finalize());
        
        self.modified = current_hash != self.source_hash;
        Ok(self.modified)
    }
}

/// Tracks code generated by DX tools
pub struct GeneratedCodeTracker {
    _db: Database,
    tracked_files: HashMap<PathBuf, GeneratedFileInfo>,
    index_path: PathBuf,
}

impl GeneratedCodeTracker {
    /// Create a new code tracker
    pub fn new(forge_dir: &Path) -> Result<Self> {
        let db_path = forge_dir.join("forge.db");
        let db = Database::new(&db_path)
            .context("Failed to open tracking database")?;
        
        let index_path = forge_dir.join("generated_files.json");
        
        // Load existing tracked files
        let tracked_files = if index_path.exists() {
            let content = std::fs::read_to_string(&index_path)?;
            serde_json::from_str(&content).unwrap_or_default()
        } else {
            HashMap::new()
        };
        
        Ok(Self {
            _db: db,
            tracked_files,
            index_path,
        })
    }
    
    /// Track a new generated file
    pub fn track_file(
        &mut self,
        file_path: PathBuf,
        tool_name: &str,
        metadata: HashMap<String, String>,
    ) -> Result<()> {
        // Compute file hash
        let source_hash = if file_path.exists() {
            let content = std::fs::read(&file_path)?;
            let mut hasher = Sha256::new();
            hasher.update(&content);
            format!("{:x}", hasher.finalize())
        } else {
            String::new()
        };
        
        let info = GeneratedFileInfo::new(
            file_path.clone(),
            tool_name.to_string(),
            source_hash,
            metadata,
        );
        
        self.tracked_files.insert(file_path.clone(), info);
        self.save_index()?;
        
        tracing::debug!("Tracked generated file: {:?}", file_path);
        Ok(())
    }
    
    /// Get all files generated by a specific tool
    pub fn get_files_by_tool(&self, tool_name: &str) -> Vec<PathBuf> {
        self.tracked_files
            .values()
            .filter(|info| info.tool_name == tool_name)
            .map(|info| info.file_path.clone())
            .collect()
    }
    
    /// Get file info
    pub fn get_file_info(&self, path: &Path) -> Option<&GeneratedFileInfo> {
        self.tracked_files.get(path)
    }
    
    /// Check if a file is tracked as generated
    pub fn is_tracked(&self, path: &Path) -> bool {
        self.tracked_files.contains_key(path)
    }
    
    /// Get all tracked files
    pub fn get_all_files(&self) -> Vec<PathBuf> {
        self.tracked_files.keys().cloned().collect()
    }
    
    /// Remove a file from tracking (without deleting the actual file)
    pub fn untrack_file(&mut self, path: &Path) -> Result<()> {
        if self.tracked_files.remove(path).is_some() {
            self.save_index()?;
            tracing::debug!("Untracked file: {:?}", path);
        }
        Ok(())
    }
    
    /// Cleanup all files generated by a tool
    pub async fn cleanup_tool_files(&mut self, tool_name: &str) -> Result<Vec<PathBuf>> {
        let files_to_remove: Vec<PathBuf> = self.get_files_by_tool(tool_name);
        let mut removed = Vec::new();
        
        for file in &files_to_remove {
            if file.exists() {
                tokio::fs::remove_file(file).await
                    .context(format!("Failed to remove file: {:?}", file))?;
                removed.push(file.clone());
                tracing::info!("Removed generated file: {:?}", file);
            }
            
            self.tracked_files.remove(file);
        }
        
        if !removed.is_empty() {
            self.save_index()?;
        }
        
        Ok(removed)
    }
    
    /// Check all tracked files for modifications
    pub async fn check_modifications(&mut self) -> Result<Vec<PathBuf>> {
        let mut modified = Vec::new();
        
        for (path, info) in &mut self.tracked_files {
            if info.check_modified().await? {
                modified.push(path.clone());
            }
        }
        
        if !modified.is_empty() {
            self.save_index()?;
        }
        
        Ok(modified)
    }
    
    /// Get statistics about tracked files
    pub fn stats(&self) -> TrackingStats {
        let mut by_tool: HashMap<String, usize> = HashMap::new();
        
        for info in self.tracked_files.values() {
            *by_tool.entry(info.tool_name.clone()).or_insert(0) += 1;
        }
        
        let modified_count = self.tracked_files
            .values()
            .filter(|info| info.modified)
            .count();
        
        TrackingStats {
            total_files: self.tracked_files.len(),
            files_by_tool: by_tool,
            modified_files: modified_count,
        }
    }
    
    /// Save the tracking index to disk
    fn save_index(&self) -> Result<()> {
        let content = serde_json::to_string_pretty(&self.tracked_files)?;
        std::fs::write(&self.index_path, content)?;
        Ok(())
    }
}

/// Statistics about tracked files
#[derive(Debug, Serialize, Deserialize)]
pub struct TrackingStats {
    pub total_files: usize,
    pub files_by_tool: HashMap<String, usize>,
    pub modified_files: usize,
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;
    
    #[tokio::test]
    async fn test_track_file() {
        let temp_dir = TempDir::new().unwrap();
        let mut tracker = GeneratedCodeTracker::new(temp_dir.path()).unwrap();
        
        let test_file = temp_dir.path().join("test.txt");
        std::fs::write(&test_file, "test content").unwrap();
        
        let mut metadata = HashMap::new();
        metadata.insert("version".to_string(), "1.0.0".to_string());
        
        tracker.track_file(test_file.clone(), "test-tool", metadata).unwrap();
        
        assert!(tracker.is_tracked(&test_file));
        let files = tracker.get_files_by_tool("test-tool");
        assert_eq!(files.len(), 1);
    }
    
    #[tokio::test]
    async fn test_cleanup_tool_files() {
        let temp_dir = TempDir::new().unwrap();
        let mut tracker = GeneratedCodeTracker::new(temp_dir.path()).unwrap();
        
        let test_file = temp_dir.path().join("test.txt");
        std::fs::write(&test_file, "test content").unwrap();
        
        tracker.track_file(test_file.clone(), "test-tool", HashMap::new()).unwrap();
        
        let removed = tracker.cleanup_tool_files("test-tool").await.unwrap();
        
        assert_eq!(removed.len(), 1);
        assert!(!test_file.exists());
        assert!(!tracker.is_tracked(&test_file));
    }
    
    #[tokio::test]
    async fn test_modification_detection() {
        let temp_dir = TempDir::new().unwrap();
        let mut tracker = GeneratedCodeTracker::new(temp_dir.path()).unwrap();
        
        let test_file = temp_dir.path().join("test.txt");
        std::fs::write(&test_file, "original content").unwrap();
        
        tracker.track_file(test_file.clone(), "test-tool", HashMap::new()).unwrap();
        
        // Modify the file
        std::fs::write(&test_file, "modified content").unwrap();
        
        let modified = tracker.check_modifications().await.unwrap();
        assert_eq!(modified.len(), 1);
        assert_eq!(modified[0], test_file);
    }
}