"""离线翻译词典导入脚本。

用法（在 backend 目录下）:
  python -m scripts.import_dictionary
  python -m scripts.import_dictionary --file data/dictionary.json
  python -m scripts.import_dictionary --file /path/to/words.csv
  python -m scripts.import_dictionary --file data/dictionary.json --source seed
"""

from __future__ import annotations

import argparse
import csv
import json
import sys
from pathlib import Path
from typing import Optional

BACKEND_DIR = Path(__file__).resolve().parent.parent
DEFAULT_FILE = BACKEND_DIR / "data" / "dictionary.json"

sys.path.insert(0, str(BACKEND_DIR))

from database import SessionLocal  # noqa: E402
from scripts.dictionary_importer import upsert_entries  # noqa: E402


def load_json(path: Path) -> list[dict]:
    data = json.loads(path.read_text(encoding="utf-8"))
    if isinstance(data, list):
        return data
    if isinstance(data, dict) and "entries" in data:
        return data["entries"]
    raise ValueError(f"无法解析 JSON 格式: {path}")


def load_csv(path: Path) -> list[dict]:
    with path.open(encoding="utf-8-sig", newline="") as f:
        reader = csv.DictReader(f)
        return list(reader)


def load_entries(path: Path) -> list[dict]:
    suffix = path.suffix.lower()
    if suffix == ".json":
        return load_json(path)
    if suffix == ".csv":
        return load_csv(path)
    raise ValueError(f"不支持的文件格式: {suffix}，请使用 .json 或 .csv")


def main() -> None:
    parser = argparse.ArgumentParser(description="导入离线翻译词典到 dictionary_entries 表")
    parser.add_argument(
        "--file",
        type=Path,
        default=DEFAULT_FILE,
        help=f"JSON 或 CSV 文件路径（默认: {DEFAULT_FILE.name}）",
    )
    parser.add_argument(
        "--source",
        type=str,
        default=None,
        help="数据来源标记，如 seed / ecdict / custom",
    )
    args = parser.parse_args()

    path = args.file if args.file.is_absolute() else BACKEND_DIR / args.file
    if not path.exists():
        print(f"错误: 文件不存在 {path}", file=sys.stderr)
        sys.exit(1)

    raw_rows = load_entries(path)
    session = SessionLocal()
    try:
        total = upsert_entries(session, raw_rows, args.source)
    finally:
        session.close()
    print(f"导入完成: 文件={path.name}, 处理={total} 条")


if __name__ == "__main__":
    main()