from __future__ import annotations

import re
import shutil
import subprocess
from pathlib import Path

import pytest

REPO_ROOT = Path(__file__).resolve().parents[1]
ENTRYPOINT = REPO_ROOT / "entrypoint.sh"


def _has_bash() -> bool:
    return shutil.which("bash") is not None


def _minimal_path() -> str:
    parts = ["/usr/bin", "/bin", "/usr/sbin", "/sbin"]
    for p in parts:
        if Path(p).exists():
            return ":".join(parts)
    return os.environ.get("PATH", "")


def _clean_env() -> dict[str, str]:
    env = {
        "PATH": _minimal_path(),
        "DEBIAN_FRONTEND": "noninteractive",
        "HOME": "/tmp",
        "LANG": "C.UTF-8",
    }
    return env


@pytest.mark.skipif(not _has_bash(), reason="bash not available")
def test_entrypoint_rejects_bad_run_at(tmp_path: Path, monkeypatch) -> None:
    """The entrypoint must exit non-zero with a clear message on a bad RUN_AT."""
    env = _clean_env()
    env["MASTODON_BASE_URL"] = "https://mastodon.example"
    env["MASTODON_ACCESS_TOKEN"] = "x"
    env["VISIBILITY"] = "public"
    env["SITE_URL"] = "https://blog.example.com"
    env["HASHTAGS"] = "#throwback"
    env["THROWNBACK_PREFIX"] = "Throwback:"
    env["MAX_RETRIES"] = "3"
    env["RUN_AT"] = "25:99"
    env["TZ"] = "Europe/Berlin"

    proc = subprocess.run(
        ["/bin/bash", str(ENTRYPOINT)],
        capture_output=True,
        text=True,
        env=env,
        timeout=10,
        check=False,
    )
    assert proc.returncode != 0
    assert "RUN_AT" in (proc.stdout + proc.stderr)


@pytest.mark.skipif(not _has_bash(), reason="bash not available")
def test_entrypoint_fails_fast_when_token_missing(tmp_path: Path, monkeypatch) -> None:
    """A missing required var must abort before cron is started."""
    env = _clean_env()
    env["MASTODON_BASE_URL"] = "https://mastodon.example"
    env["VISIBILITY"] = "public"
    env["SITE_URL"] = "https://blog.example.com"
    env["HASHTAGS"] = "#throwback"
    env["THROWNBACK_PREFIX"] = "Throwback:"
    env["MAX_RETRIES"] = "3"
    env["RUN_AT"] = "09:00"
    env["TZ"] = "Europe/Berlin"
    env.pop("MASTODON_ACCESS_TOKEN", None)

    proc = subprocess.run(
        ["/bin/bash", str(ENTRYPOINT)],
        capture_output=True,
        text=True,
        env=env,
        timeout=10,
        check=False,
    )
    assert proc.returncode != 0
    combined = (proc.stdout + proc.stderr).lower()
    assert "missing" in combined
    assert "mastodon_access_token" in combined.lower()


def test_entrypoint_references_cron_in_foreground() -> None:
    text = ENTRYPOINT.read_text()
    assert re.search(r"exec\s+cron\s+-f", text), "entrypoint must exec cron in the foreground"
    cron = (REPO_ROOT / "crontab" / "tenbackward.cron").read_text()
    assert "SHELL=/bin/bash" in cron