import json
import os
import sys
import unittest
from pathlib import Path
import shutil
import time
from unittest.mock import patch, AsyncMock
import pytest

sys.path.insert(0, str(Path(__file__).parent.parent))


class TestCleanupConfig(unittest.TestCase):
    def test_cleanup_interval_default(self):
        """Test that the default cleanup interval is 5 minutes as per Story 2.15"""
        import importlib
        import config

        old_val = os.environ.get("CLEANUP_INTERVAL_MINUTES")
        if "CLEANUP_INTERVAL_MINUTES" in os.environ:
            del os.environ["CLEANUP_INTERVAL_MINUTES"]

        try:
            importlib.reload(config)
            self.assertEqual(
                config.config.CLEANUP_INTERVAL_MINUTES,
                5,
                "Default CLEANUP_INTERVAL_MINUTES should be 5",
            )
        finally:
            if old_val is not None:
                os.environ["CLEANUP_INTERVAL_MINUTES"] = old_val
            importlib.reload(config)

    def test_cleanup_interval_env_override(self):
        """Test that CLEANUP_INTERVAL_MINUTES can be overridden via env var (AC: #2)"""
        import importlib
        import config

        old_val = os.environ.get("CLEANUP_INTERVAL_MINUTES")
        os.environ["CLEANUP_INTERVAL_MINUTES"] = "10"

        try:
            importlib.reload(config)
            self.assertEqual(
                config.config.CLEANUP_INTERVAL_MINUTES,
                10,
                "CLEANUP_INTERVAL_MINUTES should be 10 when set via env",
            )
        finally:
            if old_val is not None:
                os.environ["CLEANUP_INTERVAL_MINUTES"] = old_val
            else:
                del os.environ["CLEANUP_INTERVAL_MINUTES"]
            importlib.reload(config)


@pytest.fixture
def temp_dirs():
    """Create temporary test directories."""
    test_dir = Path("temp_test_cleanup")
    uploads = test_dir / "uploads"
    outputs = test_dir / "outputs"
    temp = test_dir / "temp"

    for d in [uploads, outputs, temp]:
        d.mkdir(parents=True, exist_ok=True)

    yield {"test_dir": test_dir, "uploads": uploads, "outputs": outputs, "temp": temp}

    if test_dir.exists():
        shutil.rmtree(test_dir)


_cleanup_module = None


def _get_cleanup_module():
    """Load cleanup module without triggering middleware/__init__.py"""
    global _cleanup_module
    if _cleanup_module is not None:
        return _cleanup_module

    import importlib.util

    cleanup_path = Path(__file__).parent.parent / "middleware" / "cleanup.py"
    spec = importlib.util.spec_from_file_location("cleanup_module_direct", cleanup_path)
    if spec is None or spec.loader is None:
        raise ImportError(f"Could not load spec from {cleanup_path}")
    _cleanup_module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(_cleanup_module)
    return _cleanup_module


def _get_redis_patcher(mock_redis):
    """Create a patcher for _get_async_redis in the cleanup module."""
    module = _get_cleanup_module()
    return patch.object(module, "_get_async_redis", return_value=mock_redis)


@pytest.mark.asyncio
async def test_orphan_deletion(temp_dirs):
    """Test that orphaned files are deleted as per Story 2.15 (AC: #4)"""
    cleanup_mod = _get_cleanup_module()
    FileCleanupManager = cleanup_mod.FileCleanupManager

    uploads = temp_dirs["uploads"]
    outputs = temp_dirs["outputs"]
    temp = temp_dirs["temp"]

    tracked_file = uploads / "tracked.txt"
    tracked_file.write_text("I am tracked")

    orphan_file = uploads / "orphan.txt"
    orphan_file.write_text("I am an orphan")

    manager = FileCleanupManager(uploads, outputs, temp, cleanup_interval_minutes=5)

    mock_redis = AsyncMock()
    mock_redis.keys.return_value = ["translation:file:job1"]
    mock_redis.get.return_value = json.dumps(
        {"file_path": str(tracked_file.absolute())}
    )

    with _get_redis_patcher(mock_redis):
        stats = await manager.cleanup()

    assert not orphan_file.exists(), "Orphan file should be deleted"
    assert tracked_file.exists(), "Tracked file should be preserved"
    assert "orphaned_deleted" in stats, "Stats should contain orphaned_deleted count"
    assert stats["orphaned_deleted"] >= 1, "Should have deleted at least 1 orphan"


@pytest.mark.asyncio
async def test_ttl_deletion(temp_dirs):
    """Test that files older than TTL are deleted (AC: #3)"""
    cleanup_mod = _get_cleanup_module()
    FileCleanupManager = cleanup_mod.FileCleanupManager

    uploads = temp_dirs["uploads"]
    outputs = temp_dirs["outputs"]
    temp = temp_dirs["temp"]

    old_file = uploads / "old.txt"
    old_file.write_text("I am old")

    past_time = time.time() - (2 * 3600)
    os.utime(old_file, (past_time, past_time))

    new_file = uploads / "new.txt"
    new_file.write_text("I am new")

    manager = FileCleanupManager(uploads, outputs, temp, max_file_age_minutes=60)

    mock_redis = AsyncMock()
    mock_redis.keys.return_value = ["job1", "job2"]
    mock_redis.get.side_effect = [
        '{"file_path": "' + str(old_file.absolute()) + '"}',
        '{"file_path": "' + str(new_file.absolute()) + '"}',
    ]

    with _get_redis_patcher(mock_redis):
        await manager.cleanup()

    assert not old_file.exists(), "Old file (2h old) should be deleted"
    assert new_file.exists(), "New file should be preserved"


@pytest.mark.asyncio
async def test_cleanup_resilience(temp_dirs):
    """Test that cleanup continues after individual failure (AC: #6)"""
    cleanup_mod = _get_cleanup_module()
    FileCleanupManager = cleanup_mod.FileCleanupManager

    uploads = temp_dirs["uploads"]
    outputs = temp_dirs["outputs"]
    temp = temp_dirs["temp"]

    f1 = uploads / "file1.txt"
    f1.write_text("file1")
    f2 = uploads / "file2.txt"
    f2.write_text("file2")

    manager = FileCleanupManager(uploads, outputs, temp, max_file_age_minutes=1)

    original_unlink = Path.unlink
    call_count = [0]

    def failing_unlink(self, *args, **kwargs):
        call_count[0] += 1
        if call_count[0] == 1:
            raise PermissionError("Cannot delete file")
        return original_unlink(self, *args, **kwargs)

    mock_redis = AsyncMock()
    mock_redis.keys.return_value = []

    with _get_redis_patcher(mock_redis):
        with patch.object(Path, "unlink", failing_unlink):
            stats = await manager.cleanup()

    assert len(stats["errors"]) >= 1, "Should have recorded at least one error"
    assert call_count[0] >= 2, "Should have attempted to delete both files (resilience)"


@pytest.mark.asyncio
async def test_logging_format(temp_dirs):
    """Test that structured logging is used (AC: #5)"""
    cleanup_mod = _get_cleanup_module()
    FileCleanupManager = cleanup_mod.FileCleanupManager

    uploads = temp_dirs["uploads"]
    outputs = temp_dirs["outputs"]
    temp = temp_dirs["temp"]

    manager = FileCleanupManager(uploads, outputs, temp)

    mock_redis = AsyncMock()
    mock_redis.keys.return_value = []

    with _get_redis_patcher(mock_redis):
        with patch.object(cleanup_mod, "logger") as mock_log:
            await manager.cleanup()

            assert mock_log.info.called, "Logger should be called"

            found_cleanup_log = False
            for call in mock_log.info.call_args_list:
                args, kwargs = call
                if args and "cleanup_completed" in str(args[0]):
                    found_cleanup_log = True
                    assert "files_deleted" in kwargs or any(
                        "files_deleted" in str(a) for a in args
                    ), "Log should contain files_deleted"
                    assert "bytes_freed_mb" in kwargs or any(
                        "bytes_freed_mb" in str(a) for a in args
                    ), "Log should contain bytes_freed_mb"
                    break

            assert found_cleanup_log, "Should have logged cleanup_completed event"


@pytest.mark.asyncio
async def test_redis_unavailable_graceful(temp_dirs):
    """Test that cleanup works when Redis is unavailable"""
    cleanup_mod = _get_cleanup_module()
    FileCleanupManager = cleanup_mod.FileCleanupManager

    uploads = temp_dirs["uploads"]
    outputs = temp_dirs["outputs"]
    temp = temp_dirs["temp"]

    old_file = uploads / "old.txt"
    old_file.write_text("I am old")
    past_time = time.time() - (2 * 3600)
    os.utime(old_file, (past_time, past_time))

    manager = FileCleanupManager(uploads, outputs, temp, max_file_age_minutes=60)

    with patch.object(cleanup_mod, "_get_async_redis", return_value=None):
        stats = await manager.cleanup()

    assert not old_file.exists(), (
        "Old file should still be deleted (age-based) even without Redis"
    )
    assert stats["files_deleted"] >= 1, "Should have deleted old file"


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