import os
from pathlib import Path
import shutil
import subprocess


CURRENT_DIR = Path(__file__).parent
STATIC_OUTPUT_DIR = CURRENT_DIR / "anime/static"
FRONTEND_DIR = CURRENT_DIR / "frontend"
DIST_DIR = FRONTEND_DIR / "dist"


class DirChanger:
    """Class for changing current directory and returning back after exit."""

    def __init__(self, path: Path):
        self.path = path

    def __enter__(self):
        os.chdir(self.path)

    def __exit__(self, *args):
        os.chdir(CURRENT_DIR)


def build(setup_kwargs):
    """
    Build frontend and copy it to the static directory.

    This script is useful for packaging the application.
    """
    print("Starting building frontend ...")
    pnpm_path = shutil.which("pnpm")
    if pnpm_path is None:
        raise Exception("pnpm command is not available. PLease install pnpm.")

    subprocess.run(
        [pnpm_path, "build"],
        cwd=CURRENT_DIR / "frontend",
        check=True,
    )

    print("Frontend build finished.")
    shutil.rmtree(STATIC_OUTPUT_DIR, ignore_errors=True)
    shutil.copytree(symlinks=True, src=DIST_DIR, dst=STATIC_OUTPUT_DIR)

    return setup_kwargs


if __name__ == "__main__":
    build({})