"""A custom pack built from hashes follows the emulator it names, or refuses.

`--from-md5 --emulator` accepted any name: an unknown one produced a generic
pack in the layout of no emulator, rc 0, where `--emulator` alone refuses it.
With a known one and `--standalone`, a profile without pack_structure kept
the bare file names under a pack called Standalone.
"""

from __future__ import annotations

import json
import subprocess
import sys
import tempfile
import unittest
import zipfile
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parent.parent


def _pack(*options: str) -> tuple[subprocess.CompletedProcess, list[str]]:
    with tempfile.TemporaryDirectory(dir=REPO_ROOT / "tmp") as out:
        proc = subprocess.run(
            [sys.executable, "scripts/generate_pack.py", *options, "--offline",
             "--output-dir", out],
            cwd=REPO_ROOT, capture_output=True, text=True, timeout=600, check=False,
        )
        names = []
        for archive in Path(out).glob("*.zip"):
            with zipfile.ZipFile(archive) as zf:
                names.extend(zf.namelist())
    return proc, names


class TheEmulatorContextIsChecked(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        db_path = REPO_ROOT / "database.json"
        if not db_path.exists():
            raise unittest.SkipTest("database.json is not built")
        (REPO_ROOT / "tmp").mkdir(exist_ok=True)
        cls.db = json.loads(db_path.read_text(encoding="utf-8"))

    def test_an_unknown_emulator_is_refused(self):
        md5 = next(iter(self.db["files"].values()))["md5"]
        proc, names = _pack("--from-md5", md5, "--emulator", "no_such_core")
        self.assertNotEqual(proc.returncode, 0, proc.stdout)
        self.assertIn("not found", proc.stderr)
        self.assertEqual(names, [])


if __name__ == "__main__":
    unittest.main()