from __future__ import annotations

from unittest.mock import Mock

import pytest

from lai_automation.models import ChangeSummary
from lai_automation.policy import validate_changes


def workspace_with_no_symlinks() -> Mock:
    workspace = Mock()
    workspace.has_symlink.return_value = False
    workspace.has_path.return_value = False
    return workspace


def test_accepts_small_application_change(settings) -> None:
    summary = ChangeSummary(
        ("app/Services/AIService.php", "tests/Feature/AITest.php"),
        25,
        4,
    )

    validate_changes(workspace_with_no_symlinks(), summary, settings)


@pytest.mark.parametrize(
    "filename",
    [
        ".env",
        ".env.example",
        ".gitea/workflows/ci.yml",
        "docker-compose.yml",
        "docker/php/Dockerfile",
        "storage/logs/output.log",
        "vendor/package/file.php",
    ],
)
def test_rejects_protected_paths(settings, filename: str) -> None:
    summary = ChangeSummary((filename, "app/Fix.php"), 2, 0)

    with pytest.raises(ValueError, match="Protected"):
        validate_changes(workspace_with_no_symlinks(), summary, settings)


@pytest.mark.parametrize(
    "filename",
    [
        "config/erp_semantics.php.backup",
        "app/Service.php.orig",
        "test_debug.php",
        "scratch.php",
    ],
)
def test_rejects_temporary_artifacts(settings, filename: str) -> None:
    summary = ChangeSummary((filename, "app/Fix.php"), 2, 0)

    with pytest.raises(ValueError, match="Temporary artifact"):
        validate_changes(workspace_with_no_symlinks(), summary, settings)


def test_rejects_git_metadata_created_in_worktree(settings) -> None:
    workspace = workspace_with_no_symlinks()
    workspace.has_path.return_value = True

    with pytest.raises(ValueError, match="Git metadata"):
        validate_changes(
            workspace,
            ChangeSummary(("app/Fix.php",), 1, 0),
            settings,
        )


def test_rejects_tests_without_application_change(settings) -> None:
    summary = ChangeSummary(("tests/Feature/FixTest.php",), 20, 0)

    with pytest.raises(ValueError, match="application source"):
        validate_changes(workspace_with_no_symlinks(), summary, settings)


def test_rejects_symlink(settings) -> None:
    workspace = workspace_with_no_symlinks()
    workspace.has_symlink.return_value = True
    summary = ChangeSummary(("app/Fix.php",), 1, 0)

    with pytest.raises(ValueError, match="Symbolic links"):
        validate_changes(workspace, summary, settings)


def test_rejects_oversized_diff(settings) -> None:
    summary = ChangeSummary(
        ("app/Fix.php",),
        settings.max_changed_lines + 1,
        0,
    )

    with pytest.raises(ValueError, match="line limit"):
        validate_changes(workspace_with_no_symlinks(), summary, settings)