"""Unit tests for devx.molecule.platforms."""

import json

from devx.molecule.platforms import PLATFORMS, load_platforms


class TestPlatforms:
    def test_platforms_not_empty(self) -> None:
        assert len(PLATFORMS) >= 1

    def test_each_platform_has_required_keys(self) -> None:
        for p in PLATFORMS:
            assert "name" in p
            assert "image" in p
            assert "command" in p

    def test_platform_names_unique(self) -> None:
        names = [p["name"] for p in PLATFORMS]
        assert len(names) == len(set(names))

    def test_platforms_use_sleep_infinity(self) -> None:
        """All default platforms must use sleep infinity, not systemd."""
        for p in PLATFORMS:
            assert p["command"] == "sleep infinity", f"Platform {p['name']} uses {p['command']}"

    def test_known_platforms_present(self) -> None:
        names = {p["name"] for p in PLATFORMS}
        assert "ubuntu-2604" in names


class TestLoadPlatforms:
    def test_load_platforms_default(self, tmp_path) -> None:  # type: ignore[no-untyped-def]
        """load_platforms with no file returns PLATFORMS."""
        result = load_platforms(None)
        assert result == PLATFORMS

    def test_load_platforms_from_file(self, tmp_path) -> None:  # type: ignore[no-untyped-def]
        """load_platforms reads custom platforms from JSON file."""
        custom = [
            {"name": "custom-os", "image": "custom:latest", "command": "sleep infinity"},
        ]
        f = tmp_path / "platforms.json"
        f.write_text(json.dumps(custom))
        result = load_platforms(f)
        assert result == custom

    def test_load_platforms_missing_file_falls_back(self, tmp_path) -> None:  # type: ignore[no-untyped-def]
        """load_platforms falls back to PLATFORMS when file doesn't exist."""
        result = load_platforms(tmp_path / "nonexistent.json")
        assert result == PLATFORMS

    def test_load_platforms_empty_list_falls_back(self, tmp_path) -> None:  # type: ignore[no-untyped-def]
        """load_platforms falls back to PLATFORMS when file has empty list."""
        f = tmp_path / "platforms.json"
        f.write_text("[]")
        result = load_platforms(f)
        assert result == PLATFORMS