#!/usr/bin/env python3
"""共通テンプレートから新しい論文DBプロジェクトを作成する。"""

from __future__ import annotations

import argparse
import shutil
from pathlib import Path

COMMON_ROOT = Path(__file__).resolve().parent
TEMPLATE_DIR = COMMON_ROOT / "templates" / "project"
TEMPLATE_FILES = (
    "config.py",
    "README.org",
)


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="新しい分野DBを作成する"
    )
    parser.add_argument(
        "directory",
        type=Path,
        help="作成するプロジェクトディレクトリ",
    )
    parser.add_argument(
        "--force",
        action="store_true",
        help="既存ファイルを上書きする",
    )
    return parser.parse_args()


def validate_destination(
    destination: Path,
    force: bool,
) -> None:
    if not destination.exists():
        return
    if not destination.is_dir():
        raise NotADirectoryError(destination)
    if any(destination.iterdir()) and not force:
        raise FileExistsError(
            f"空でないディレクトリです: {destination}"
        )


def copy_template_files(destination: Path) -> None:
    for name in TEMPLATE_FILES:
        source = TEMPLATE_DIR / name
        if not source.is_file():
            raise FileNotFoundError(source)
        shutil.copy2(source, destination / name)


def create_directories(destination: Path) -> None:
    (destination / "tmp" / "text").mkdir(
        parents=True,
        exist_ok=True,
    )
    (destination / "logs").mkdir(
        parents=True,
        exist_ok=True,
    )


def main() -> int:
    args = parse_args()
    destination = args.directory.expanduser().resolve()
    validate_destination(destination, args.force)
    destination.mkdir(parents=True, exist_ok=True)
    copy_template_files(destination)
    create_directories(destination)
    print(destination)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())