import hashlib

from id_configurator.config import Configuration
from id_configurator.context import Context
from id_configurator.modules.apk import ApkModule

KEY_BYTES = b"fake-apk-key-bytes"
KEY_FILENAME = f"{hashlib.sha256(KEY_BYTES).hexdigest()[:16]}.rsa.pub"

CONFIG_DATA = {
    "uuid": "12345678-1234-5678-1234-567812345678",
    "organisation": "InterDiode",
    "configurations": {
        "apk": {
            "repositories": [
                {
                    "name": "main",
                    "url": "https://example.invalid/v3.19/main",
                    "key": KEY_BYTES,
                },
                {"name": "community", "url": "https://example.invalid/v3.19/community"},
            ]
        }
    },
}


def make_config() -> Configuration:
    return Configuration.model_validate(CONFIG_DATA)


def test_is_relevant_false_without_src(tmp_path) -> None:
    context = Context(config=make_config(), dst=tmp_path / "dst", src=None)
    assert ApkModule().is_relevant(context) is False


def test_is_relevant_false_without_apk_dir(tmp_path) -> None:
    src = tmp_path / "src"
    src.mkdir()
    context = Context(config=make_config(), dst=tmp_path / "dst", src=src)
    assert ApkModule().is_relevant(context) is False


def test_is_relevant_true_with_apk_dir(tmp_path) -> None:
    src = tmp_path / "src"
    (src / "etc/apk").mkdir(parents=True)
    context = Context(config=make_config(), dst=tmp_path / "dst", src=src)
    assert ApkModule().is_relevant(context) is True


def test_apply_copies_existing_repositories_unchanged_without_url_to_replace(
    tmp_path,
) -> None:
    src = tmp_path / "src"
    apk_dir = src / "etc/apk"
    apk_dir.mkdir(parents=True)
    (apk_dir / "repositories").write_text(
        "# comment\nhttps://old-mirror.invalid/v3.18/main\nhttps://old-mirror.invalid/v3.18/community\n",
        encoding="utf-8",
    )

    dst = tmp_path / "dst"
    context = Context(config=make_config(), dst=dst, src=src)

    ApkModule().apply(context)

    # No configured repository declares a url_to_replace, so the existing
    # lines are copied through unchanged, still active.
    content = (dst / "etc/apk/repositories").read_text(encoding="utf-8")
    assert content == (
        "# comment\n"
        "https://old-mirror.invalid/v3.18/main\n"
        "https://old-mirror.invalid/v3.18/community\n"
        "https://example.invalid/v3.19/main\n"
        "https://example.invalid/v3.19/community\n"
    )

    key_content = (dst / "etc/apk/keys" / KEY_FILENAME).read_bytes()
    assert key_content == KEY_BYTES


def test_apply_disables_only_existing_lines_matching_url_to_replace(tmp_path) -> None:
    src = tmp_path / "src"
    apk_dir = src / "etc/apk"
    apk_dir.mkdir(parents=True)
    (apk_dir / "repositories").write_text(
        "https://old-mirror.invalid/v3.18/main\nhttps://old-mirror.invalid/v3.18/community\n",
        encoding="utf-8",
    )
    data = {
        "uuid": "12345678-1234-5678-1234-567812345678",
        "organisation": "InterDiode",
        "configurations": {
            "apk": {
                "repositories": [
                    {
                        "name": "main",
                        "url": "https://example.invalid/v3.19/main",
                        "url_to_replace": "https://old-mirror.invalid/v3.18/main",
                    }
                ]
            }
        },
    }
    dst = tmp_path / "dst"
    context = Context(config=Configuration.model_validate(data), dst=dst, src=src)

    ApkModule().apply(context)

    content = (dst / "etc/apk/repositories").read_text(encoding="utf-8")
    assert content == (
        "# https://old-mirror.invalid/v3.18/main\n"
        "https://old-mirror.invalid/v3.18/community\n"
        "https://example.invalid/v3.19/main\n"
    )


def test_apply_without_existing_repositories_file(tmp_path) -> None:
    src = tmp_path / "src"
    (src / "etc/apk").mkdir(parents=True)
    dst = tmp_path / "dst"
    context = Context(config=make_config(), dst=dst, src=src)

    ApkModule().apply(context)

    content = (dst / "etc/apk/repositories").read_text(encoding="utf-8")
    assert (
        content
        == "https://example.invalid/v3.19/main\nhttps://example.invalid/v3.19/community\n"
    )


def test_apply_skips_repository_when_url_to_replace_matches_nothing(tmp_path) -> None:
    src = tmp_path / "src"
    apk_dir = src / "etc/apk"
    apk_dir.mkdir(parents=True)
    (apk_dir / "repositories").write_text(
        "https://old-mirror.invalid/v3.18/main\n", encoding="utf-8"
    )
    data = {
        "uuid": "12345678-1234-5678-1234-567812345678",
        "organisation": "InterDiode",
        "configurations": {
            "apk": {
                "repositories": [
                    {
                        "name": "main",
                        "url": "https://example.invalid/v3.19/main",
                        "url_to_replace": "https://other.invalid/*",
                    }
                ]
            }
        },
    }
    dst = tmp_path / "dst"
    context = Context(config=Configuration.model_validate(data), dst=dst, src=src)

    ApkModule().apply(context)

    content = (dst / "etc/apk/repositories").read_text(encoding="utf-8")
    assert "example.invalid" not in content


def test_apply_writes_repository_when_url_to_replace_matches_existing(tmp_path) -> None:
    src = tmp_path / "src"
    apk_dir = src / "etc/apk"
    apk_dir.mkdir(parents=True)
    (apk_dir / "repositories").write_text(
        "https://old-mirror.invalid/v3.18/main\n", encoding="utf-8"
    )
    data = {
        "uuid": "12345678-1234-5678-1234-567812345678",
        "organisation": "InterDiode",
        "configurations": {
            "apk": {
                "repositories": [
                    {
                        "name": "main",
                        "url": "https://example.invalid/v3.19/main",
                        "url_to_replace": "https://old-mirror.invalid/*",
                    }
                ]
            }
        },
    }
    dst = tmp_path / "dst"
    context = Context(config=Configuration.model_validate(data), dst=dst, src=src)

    ApkModule().apply(context)

    content = (dst / "etc/apk/repositories").read_text(encoding="utf-8")
    assert "https://example.invalid/v3.19/main" in content


def test_apply_reuses_cached_existing_urls_and_handles_missing_file(tmp_path) -> None:
    src = tmp_path / "src"
    (src / "etc/apk").mkdir(parents=True)
    data = {
        "uuid": "12345678-1234-5678-1234-567812345678",
        "organisation": "InterDiode",
        "configurations": {
            "apk": {
                "repositories": [
                    {
                        "name": "main",
                        "url": "https://example.invalid/v3.19/main",
                        "url_to_replace": "https://old.invalid/*",
                    },
                    {
                        "name": "community",
                        "url": "https://example.invalid/v3.19/community",
                        "url_to_replace": "https://old.invalid/*",
                    },
                ]
            }
        },
    }
    dst = tmp_path / "dst"
    context = Context(config=Configuration.model_validate(data), dst=dst, src=src)

    ApkModule().apply(context)

    assert not (dst / "etc/apk/repositories").exists()


def test_apply_writes_nothing_when_no_repositories_at_all(tmp_path) -> None:
    empty_config = Configuration.model_validate(
        {"uuid": "12345678-1234-5678-1234-567812345678", "organisation": "InterDiode"}
    )
    src = tmp_path / "src"
    (src / "etc/apk").mkdir(parents=True)
    dst = tmp_path / "dst"
    context = Context(config=empty_config, dst=dst, src=src)

    ApkModule().apply(context)

    assert not (dst / "etc/apk/repositories").exists()