# -*- coding: utf-8 -*-
"""
将当前 MySQL 演示数据与静态资源导出到仓库，便于他人 clone 后复现相同界面效果。

生成物：
  sql/seed_snapshot.sql          — user / model / media / detection / operation 全量数据
  seed_assets/snapshot/static/   — medias、models、results、avatars
  seed_assets/snapshot/training_meta/ — 训练任务与数据集元数据 JSON
  seed_assets/snapshot/manifest.json   — 导出摘要

用法（项目根或 BridgeDiseaseBackend-main 下，需 MySQL 3307 可连）：
  python scripts/export_db_snapshot.py
"""
from __future__ import annotations

import json
import os
import shutil
import subprocess
import sys
from datetime import datetime, timezone
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
SQL_OUT = ROOT / 'sql' / 'seed_snapshot.sql'
SNAPSHOT_ROOT = ROOT / 'seed_assets' / 'snapshot'
STATIC_SRC = ROOT / 'app' / 'static'
STATIC_DST = SNAPSHOT_ROOT / 'static'
TRAINING_SRC = ROOT / 'data' / 'training_meta'
TRAINING_DST = SNAPSHOT_ROOT / 'training_meta'

TABLES = ('user', 'model', 'media', 'detection', 'operation')
STATIC_DIRS = ('medias', 'models', 'results', 'avatars')


def _db_env():
    uri = os.environ.get(
        'SQLALCHEMY_DATABASE_URI',
        'mysql+pymysql://root:bridgedisease_root@127.0.0.1:3307/bridge_disease?charset=utf8mb4',
    )
    # mysql+pymysql://user:pass@host:port/db?...
    body = uri.split('://', 1)[-1]
    auth, rest = body.split('@', 1)
    user, password = auth.split(':', 1)
    host_port, db_part = rest.split('/', 1)
    database = db_part.split('?', 1)[0]
    host, port = (host_port.split(':', 1) + ['3306'])[:2]
    return {
        'host': host,
        'port': port,
        'user': user,
        'password': password,
        'database': database,
    }


def dump_mysql(cfg: dict) -> None:
    SQL_OUT.parent.mkdir(parents=True, exist_ok=True)
    header = (
        '-- 检澜 DockScope 演示数据快照（由 scripts/export_db_snapshot.py 生成）\n'
        f"-- 导出时间 UTC: {datetime.now(timezone.utc).isoformat()}\n"
        'SET NAMES utf8mb4;\n'
        'SET FOREIGN_KEY_CHECKS=0;\n'
        'SET sql_mode = \'NO_AUTO_VALUE_ON_ZERO\';\n\n'
    )
    cmd = [
        'mysqldump',
        f"--host={cfg['host']}",
        f"--port={cfg['port']}",
        f"-u{cfg['user']}",
        f"-p{cfg['password']}",
        '--default-character-set=utf8mb4',
        '--no-create-info',
        '--skip-triggers',
        '--complete-insert',
        '--hex-blob',
        cfg['database'],
        *TABLES,
    ]
    try:
        proc = subprocess.run(cmd, capture_output=True, check=True)
    except FileNotFoundError:
        # 尝试 Docker 中的 mysql 客户端
        docker_cmd = [
            'docker',
            'exec',
            'bridge-disease-mysql',
            'mysqldump',
            f"-u{cfg['user']}",
            f"-p{cfg['password']}",
            '--default-character-set=utf8mb4',
            '--no-create-info',
            '--skip-triggers',
            '--complete-insert',
            '--hex-blob',
            cfg['database'],
            *TABLES,
        ]
        proc = subprocess.run(docker_cmd, capture_output=True, check=True)
    body = proc.stdout.decode('utf-8', errors='replace')
    footer = '\nSET FOREIGN_KEY_CHECKS=1;\n'
    SQL_OUT.write_text(header + body + footer, encoding='utf-8')
    print(f'[ok] SQL -> {SQL_OUT} ({SQL_OUT.stat().st_size // 1024} KB)')


def copy_tree(src: Path, dst: Path) -> int:
    if not src.is_dir():
        return 0
    if dst.exists():
        shutil.rmtree(dst)
    shutil.copytree(src, dst)
    count = sum(1 for _ in dst.rglob('*') if _.is_file())
    print(f'[ok] {src.name} -> {dst} ({count} files)')
    return count


def main() -> int:
    cfg = _db_env()
    print(f"Export from {cfg['user']}@{cfg['host']}:{cfg['port']}/{cfg['database']}")

    dump_mysql(cfg)

    STATIC_DST.parent.mkdir(parents=True, exist_ok=True)
    file_counts = {}
    for name in STATIC_DIRS:
        src = STATIC_SRC / name
        if src.is_dir():
            file_counts[name] = copy_tree(src, STATIC_DST / name)

    # 用户头像（SQL 引用 static/avatars/1~3.jpg）
    avatars_dst = STATIC_DST / 'avatars'
    avatars_dst.mkdir(parents=True, exist_ok=True)
    media_pool = list((STATIC_SRC / 'medias').glob('*.jpg')) or list(
        (ROOT / 'seed_assets' / 'medias').glob('*.jpg')
    )
    for i in range(1, 4):
        dst = avatars_dst / f'{i}.jpg'
        if not dst.is_file() and media_pool:
            shutil.copy2(media_pool[(i - 1) % len(media_pool)], dst)
    if avatars_dst.is_dir():
        file_counts['avatars'] = sum(1 for _ in avatars_dst.glob('*.jpg'))
        print(f'[ok] avatars -> {avatars_dst} ({file_counts["avatars"]} files)')

    training_files = 0
    if TRAINING_SRC.is_dir():
        TRAINING_DST.parent.mkdir(parents=True, exist_ok=True)
        if TRAINING_DST.exists():
            shutil.rmtree(TRAINING_DST)
        shutil.copytree(TRAINING_SRC, TRAINING_DST)
        training_files = sum(1 for _ in TRAINING_DST.rglob('*') if _.is_file())
        print(f'[ok] training_meta -> {TRAINING_DST} ({training_files} files)')

    manifest = {
        'exported_at': datetime.now(timezone.utc).isoformat(),
        'database': cfg['database'],
        'tables': list(TABLES),
        'static_files': file_counts,
        'training_meta_files': training_files,
        'sql_file': 'sql/seed_snapshot.sql',
    }
    SNAPSHOT_ROOT.mkdir(parents=True, exist_ok=True)
    manifest_path = SNAPSHOT_ROOT / 'manifest.json'
    manifest_path.write_text(
        json.dumps(manifest, ensure_ascii=False, indent=2), encoding='utf-8'
    )
    print(f'[ok] manifest -> {manifest_path}')
    print('\n请提交 sql/seed_snapshot.sql 与 seed_assets/snapshot/ 到 Git，供他人运行 import_db_snapshot.py')
    return 0


if __name__ == '__main__':
    sys.exit(main())