#!/usr/bin/env python3

import asyncio
import logging
import sys
from datetime import datetime
from os import cpu_count
from pathlib import Path
from shutil import rmtree, which
from tempfile import gettempdir
from typing import Any, Union

import click

from black_primer import lib


DEFAULT_CONFIG = Path(__file__).parent / "primer.json"
_timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
DEFAULT_WORKDIR = Path(gettempdir()) / f"primer.{_timestamp}"
LOG = logging.getLogger(__name__)


def _handle_debug(
    ctx: click.core.Context,
    param: Union[click.core.Option, click.core.Parameter],
    debug: Union[bool, int, str],
) -> Union[bool, int, str]:
    """Turn on debugging if asked otherwise INFO default"""
    log_level = logging.DEBUG if debug else logging.INFO
    logging.basicConfig(
        format="[%(asctime)s] %(levelname)s: %(message)s (%(filename)s:%(lineno)d)",
        level=log_level,
    )
    return debug


async def async_main(
    config: str,
    debug: bool,
    keep: bool,
    long_checkouts: bool,
    rebase: bool,
    workdir: str,
    workers: int,
) -> int:
    work_path = Path(workdir)
    if not work_path.exists():
        LOG.debug(f"Creating {work_path}")
        work_path.mkdir()

    if not which("black"):
        LOG.error("Can not find 'black' executable in PATH. No point in running")
        return -1

    try:
        ret_val = await lib.process_queue(
            config, work_path, workers, keep, long_checkouts, rebase
        )
        return int(ret_val)
    finally:
        if not keep and work_path.exists():
            LOG.debug(f"Removing {work_path}")
            rmtree(work_path)

    return -2


@click.command(context_settings={"help_option_names": ["-h", "--help"]})
@click.option(
    "-c",
    "--config",
    default=str(DEFAULT_CONFIG),
    type=click.Path(exists=True),
    show_default=True,
    help="JSON config file path",
)
@click.option(
    "--debug",
    is_flag=True,
    callback=_handle_debug,
    show_default=True,
    help="Turn on debug logging",
)
@click.option(
    "-k",
    "--keep",
    is_flag=True,
    show_default=True,
    help="Keep workdir + repos post run",
)
@click.option(
    "-L",
    "--long-checkouts",
    is_flag=True,
    show_default=True,
    help="Pull big projects to test",
)
@click.option(
    "-R",
    "--rebase",
    is_flag=True,
    show_default=True,
    help="Rebase project if already checked out",
)
@click.option(
    "-w",
    "--workdir",
    default=str(DEFAULT_WORKDIR),
    type=click.Path(exists=False),
    show_default=True,
    help="Directory path for repo checkouts",
)
@click.option(
    "-W",
    "--workers",
    default=int((cpu_count() or 4) / 2) or 1,
    type=int,
    show_default=True,
    help="Number of parallel worker coroutines",
)
@click.pass_context
def main(ctx: click.core.Context, **kwargs: Any) -> None:
    """primer - prime projects for blackening... 🏴"""
    LOG.debug(f"Starting {sys.argv[0]}")
    # TODO: Change to asyncio.run when Black >= 3.7 only
    loop = asyncio.get_event_loop()
    try:
        ctx.exit(loop.run_until_complete(async_main(**kwargs)))
    finally:
        loop.close()


if __name__ == "__main__":  # pragma: nocover
    main()