"""Consistent SQLite + asset backup. Run: docker compose exec siteforge python -m app.backup"""
import os
import sqlite3
import tempfile
import zipfile
from pathlib import Path
from datetime import datetime, timezone
from . import db


def backup():
    db.init()
    storage=Path(db.DATA).resolve()
    path=storage/'backups'
    path.mkdir(exist_ok=True,parents=True)
    name='siteforge-backup-'+datetime.now(timezone.utc).strftime('%Y%m%d-%H%M%S')+'.zip'
    dest=path/name
    # SQLite online backup is consistent even when the DB uses WAL mode.
    with tempfile.TemporaryDirectory() as tmp:
        snapshot=Path(tmp)/'siteforge.sqlite3'
        with sqlite3.connect(db.DB_FILE) as source, sqlite3.connect(snapshot) as target:
            source.backup(target)
        with zipfile.ZipFile(dest,'w',compression=zipfile.ZIP_DEFLATED,compresslevel=5) as output:
            output.write(snapshot,'siteforge.sqlite3')
            for subdir in ('media','legacy','builds','archives'):
                root=storage/subdir
                if not root.is_dir():continue
                for file in root.rglob('*'):
                    if file.is_file() and not file.is_symlink():
                        output.write(file, file.relative_to(storage).as_posix())
    print(f'备份成功: {dest}')
    print('注意：备份文件仍在 Docker 数据卷内。请使用 docker compose cp 或其他方式再复制到外部设备。')
    return dest

if __name__=='__main__':backup()