"""Git Repository Utilities"""
import subprocess
import logging
from pathlib import Path
from typing import Dict, Any

logger = logging.getLogger(__name__)

def get_git_diff(repo_path: str, base_branch: str, head_branch: str) -> Dict[str, Any]:
    """
    Get Git diff between branches.
    
    Returns:
        dict: Changed files with line ranges
    """
    try:
        # Get list of changed files
        result = subprocess.run(
            ["git", "diff", "--name-only", f"{base_branch}...{head_branch}"],
            cwd=repo_path,
            capture_output=True,
            text=True,
            timeout=30
        )
        
        if result.returncode != 0:
            raise RuntimeError(f"Git diff failed: {result.stderr}")
        
        changed_files = [f for f in result.stdout.strip().split("\n") if f]
        
        # Get detailed diff for each file
        files_with_changes = []
        for file_path in changed_files:
            # Skip if not Python/JS/TS
            if not file_path.endswith((".py", ".js", ".ts")):
                continue
            
            diff_result = subprocess.run(
                ["git", "diff", f"{base_branch}...{head_branch}", "--", file_path],
                cwd=repo_path,
                capture_output=True,
                text=True,
                timeout=30
            )
            
            files_with_changes.append({
                "path": file_path,
                "diff": diff_result.stdout,
                "full_path": str(Path(repo_path) / file_path)
            })
        
        return {
            "changed_files": changed_files,
            "analyzable_files": files_with_changes,
            "base_branch": base_branch,
            "head_branch": head_branch
        }
    
    except Exception as e:
        logger.error(f"Git diff failed: {e}")
        raise RuntimeError(f"Git operations failed: {e}")

def is_git_repository(path: str) -> bool:
    """Check if path is a Git repository"""
    try:
        subprocess.run(
            ["git", "rev-parse", "--git-dir"],
            cwd=path,
            capture_output=True,
            timeout=5,
            check=True
        )
        return True
    except:
        return False