#!/usr/bin/env python3

from datetime import datetime, timezone
from os import environ, sep
from pathlib import Path
from subprocess import check_call, check_output, run
from sys import executable
from typing import Iterator

_TOP_LV = Path(__file__).resolve(strict=True).parent.parent


def _git_identity() -> None:
    email = "ci@ci.ci"
    username = "ci-bot"
    check_call(("git", "config", "--global", "user.email", email))
    check_call(("git", "config", "--global", "user.name", username))


def _get_branch() -> str:
    if ref := environ.get("GITHUB_REF"):
        return ref.replace("refs/heads/", "")
    else:
        br = check_output(("git", "branch", "--show-current"), text=True, cwd=_TOP_LV)
        return br.strip()


def _git_clone(path: Path) -> None:
    if not path.is_dir():
        if token := environ.get("CI_TOKEN"):
            uri = f"https://ms-jpq:{token}@github.com/ms-jpq/chadtree.git"
        else:
            uri = "git@github.com:ms-jpq/chadtree.git"

        branch = _get_branch()
        check_call(("git", "clone", "--branch", branch, uri, path))


def _build() -> None:
    check_call((executable, "-m", "ci"), cwd=_TOP_LV)


def _git_alert(cwd: Path) -> None:
    prefix = "ci"
    remote_brs = check_output(("git", "branch", "--remotes"), text=True, cwd=cwd)

    def cont() -> Iterator[str]:
        for br in remote_brs.splitlines():
            b = br.strip()
            if b and "->" not in b:
                _, _, name = b.partition(sep)
                if name.startswith(prefix):
                    yield name

    refs = tuple(cont())

    if refs:
        check_call(("git", "push", "--delete", "origin", *refs), cwd=cwd)

    proc = run(("git", "diff", "--exit-code"), cwd=cwd)
    print(proc)
    if proc.returncode:
        time = datetime.now(tz=timezone.utc).strftime("%Y-%m-%d")
        brname = f"{prefix}--{time}"
        check_call(("git", "checkout", "-b", brname), cwd=cwd)
        check_call(("git", "add", "."), cwd=cwd)
        check_call(("git", "commit", "-m", f"update_icons: {time}"), cwd=cwd)
        check_call(
            ("git", "push", "--force", "--set-upstream", "origin", brname), cwd=cwd
        )


def main() -> None:
    cwd = Path() / "temp"
    if "CI" in environ:
        _git_identity()
    _git_clone(cwd)
    _build()
    _git_alert(_TOP_LV)


main()