"""
Changelog management
"""
from pathlib import Path
from datetime import datetime
import subprocess


class ChangeLog:
    def __init__(self, repo_path: Path):
        self.changelog_path = repo_path / 'madomeda_changelog.txt'
        self.current_session = None
    
    def start_session(self):
        """Start a new changelog session"""
        # Get current commit hash
        result = subprocess.run(
            ['git', 'rev-parse', 'HEAD'],
            cwd=self.changelog_path.parent,
            capture_output=True,
            text=True
        )
        commit_hash = result.stdout.strip() if result.returncode == 0 else 'no-commit'
        
        timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        self.current_session = f"{timestamp} (commit: {commit_hash})\n"
        self.entries = []
    
    def add_entry(self, file_path: str, message: str = "frontmatter updated"):
        """Add a changelog entry"""
        if self.current_session:
            self.entries.append(f"  {file_path} - {message}")
    
    def write(self):
        """Write changelog to file"""
        if not self.current_session or not self.entries:
            return
        
        content = self.current_session
        content += '\n'.join(self.entries)
        content += '\n\n'
        
        # Append to changelog file
        with open(self.changelog_path, 'a', encoding='utf-8') as f:
            f.write(content)