"""Tests for download queue API endpoints."""
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from httpx import ASGITransport, AsyncClient

from src.server.fastapi_app import app
from src.server.models.download import DownloadPriority, QueueStats, QueueStatus
from src.server.services.auth_service import auth_service
from src.server.services.download_service import DownloadServiceError


@pytest.fixture(autouse=True)
def reset_auth_state():
    """Reset auth service state before each test."""
    # Clear any rate limiting state
    if hasattr(auth_service, '_failed'):
        auth_service._failed.clear()
    yield
    # Cleanup after test
    if hasattr(auth_service, '_failed'):
        auth_service._failed.clear()


@pytest.fixture
async def authenticated_client(mock_download_service):
    """Create authenticated async client."""
    # Ensure auth is configured for test
    if not auth_service.is_configured():
        auth_service.setup_master_password("TestPass123!")

    # Override the dependency with our mock
    from src.server.utils.dependencies import get_download_service
    app.dependency_overrides[get_download_service] = (
        lambda: mock_download_service
    )

    transport = ASGITransport(app=app)
    async with AsyncClient(
        transport=transport, base_url="http://test"
    ) as client:
        # Login to get token
        r = await client.post(
            "/api/auth/login", json={"password": "TestPass123!"}
        )
        assert r.status_code == 200, f"Login failed: {r.status_code} {r.text}"
        token = r.json()["access_token"]

        # Set authorization header for all requests
        client.headers["Authorization"] = f"Bearer {token}"

        yield client
    
    # Clean up dependency override
    app.dependency_overrides.clear()


@pytest.fixture
def mock_download_service():
    """Mock DownloadService for testing."""
    service = MagicMock()

    # Mock queue status
    service.get_queue_status = AsyncMock(
        return_value=QueueStatus(
            is_running=True,
            is_paused=False,
            active_downloads=[],
            pending_queue=[],
            completed_downloads=[],
            failed_downloads=[],
        )
    )

    # Mock queue stats
    service.get_queue_stats = AsyncMock(
        return_value=QueueStats(
            total_items=0,
            pending_count=0,
            active_count=0,
            completed_count=0,
            failed_count=0,
            total_downloaded_mb=0.0,
        )
    )

    # Mock add_to_queue
    service.add_to_queue = AsyncMock(
        return_value=["item-id-1", "item-id-2"]
    )

    # Mock remove_from_queue
    service.remove_from_queue = AsyncMock(return_value=["item-id-1"])

    # Mock reorder_queue
    service.reorder_queue = AsyncMock(return_value=True)

    # Mock start/stop/pause/resume
    service.start = AsyncMock()
    service.stop = AsyncMock()
    service.pause_queue = AsyncMock()
    service.resume_queue = AsyncMock()

    # Mock clear_completed and retry_failed
    service.clear_completed = AsyncMock(return_value=5)
    service.retry_failed = AsyncMock(return_value=["item-id-3"])

    return service


@pytest.mark.asyncio
async def test_get_queue_status(authenticated_client, mock_download_service):
    """Test GET /api/queue/status endpoint."""
    response = await authenticated_client.get("/api/queue/status")

    assert response.status_code == 200
    data = response.json()

    assert "status" in data
    assert "statistics" in data
    assert data["status"]["is_running"] is True
    assert data["status"]["is_paused"] is False

    mock_download_service.get_queue_status.assert_called_once()
    mock_download_service.get_queue_stats.assert_called_once()


@pytest.mark.asyncio
async def test_get_queue_status_unauthorized(mock_download_service):
    """Test GET /api/queue/status without authentication."""
    transport = ASGITransport(app=app)
    async with AsyncClient(
        transport=transport, base_url="http://test"
    ) as client:
        response = await client.get("/api/queue/status")
        # Should return 401 or 503 (503 if service not available)
        assert response.status_code in (401, 503)


@pytest.mark.asyncio
async def test_add_to_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/add endpoint."""
    request_data = {
        "serie_id": "series-1",
        "serie_name": "Test Anime",
        "episodes": [
            {"season": 1, "episode": 1},
            {"season": 1, "episode": 2},
        ],
        "priority": "normal",
    }

    response = await authenticated_client.post(
        "/api/queue/add", json=request_data
    )

    assert response.status_code == 201
    data = response.json()

    assert data["status"] == "success"
    assert len(data["added_items"]) == 2
    assert data["added_items"] == ["item-id-1", "item-id-2"]

    mock_download_service.add_to_queue.assert_called_once()


@pytest.mark.asyncio
async def test_add_to_queue_with_high_priority(
    authenticated_client, mock_download_service
):
    """Test adding items with HIGH priority."""
    request_data = {
        "serie_id": "series-1",
        "serie_name": "Test Anime",
        "episodes": [{"season": 1, "episode": 1}],
        "priority": "high",
    }

    response = await authenticated_client.post(
        "/api/queue/add", json=request_data
    )

    assert response.status_code == 201

    # Verify priority was passed correctly
    call_args = mock_download_service.add_to_queue.call_args
    assert call_args[1]["priority"] == DownloadPriority.HIGH


@pytest.mark.asyncio
async def test_add_to_queue_empty_episodes(
    authenticated_client, mock_download_service
):
    """Test adding empty episodes list returns 400."""
    request_data = {
        "serie_id": "series-1",
        "serie_name": "Test Anime",
        "episodes": [],
        "priority": "normal",
    }

    response = await authenticated_client.post(
        "/api/queue/add", json=request_data
    )

    assert response.status_code == 400


@pytest.mark.asyncio
async def test_add_to_queue_service_error(
    authenticated_client, mock_download_service
):
    """Test adding to queue when service raises error."""
    mock_download_service.add_to_queue.side_effect = DownloadServiceError(
        "Queue full"
    )

    request_data = {
        "serie_id": "series-1",
        "serie_name": "Test Anime",
        "episodes": [{"season": 1, "episode": 1}],
        "priority": "normal",
    }

    response = await authenticated_client.post(
        "/api/queue/add", json=request_data
    )

    assert response.status_code == 400
    assert "Queue full" in response.json()["detail"]


@pytest.mark.asyncio
async def test_remove_from_queue_single(
    authenticated_client, mock_download_service
):
    """Test DELETE /api/queue/{item_id} endpoint."""
    response = await authenticated_client.delete("/api/queue/item-id-1")

    assert response.status_code == 204

    mock_download_service.remove_from_queue.assert_called_once_with(
        ["item-id-1"]
    )


@pytest.mark.asyncio
async def test_remove_from_queue_not_found(
    authenticated_client, mock_download_service
):
    """Test removing non-existent item returns 404."""
    mock_download_service.remove_from_queue.return_value = []

    response = await authenticated_client.delete(
        "/api/queue/non-existent-id"
    )

    assert response.status_code == 404


@pytest.mark.asyncio
async def test_remove_multiple_from_queue(
    authenticated_client, mock_download_service
):
    """Test DELETE /api/queue/ with multiple items."""
    request_data = {"item_ids": ["item-id-1", "item-id-2"]}

    response = await authenticated_client.request(
        "DELETE", "/api/queue/", json=request_data
    )

    assert response.status_code == 204

    mock_download_service.remove_from_queue.assert_called_once_with(
        ["item-id-1", "item-id-2"]
    )


@pytest.mark.asyncio
async def test_remove_multiple_empty_list(
    authenticated_client, mock_download_service
):
    """Test removing with empty item list returns 400."""
    request_data = {"item_ids": []}

    response = await authenticated_client.request(
        "DELETE", "/api/queue/", json=request_data
    )

    assert response.status_code == 400


@pytest.mark.asyncio
async def test_start_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/start endpoint."""
    response = await authenticated_client.post("/api/queue/start")

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert "started" in data["message"].lower()

    mock_download_service.start.assert_called_once()


@pytest.mark.asyncio
async def test_stop_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/stop endpoint."""
    response = await authenticated_client.post("/api/queue/stop")

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert "stopped" in data["message"].lower()

    mock_download_service.stop.assert_called_once()


@pytest.mark.asyncio
async def test_pause_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/pause endpoint."""
    response = await authenticated_client.post("/api/queue/pause")

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert "paused" in data["message"].lower()

    mock_download_service.pause_queue.assert_called_once()


@pytest.mark.asyncio
async def test_resume_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/resume endpoint."""
    response = await authenticated_client.post("/api/queue/resume")

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert "resumed" in data["message"].lower()

    mock_download_service.resume_queue.assert_called_once()


@pytest.mark.asyncio
async def test_reorder_queue(authenticated_client, mock_download_service):
    """Test POST /api/queue/reorder endpoint."""
    request_data = {"item_id": "item-id-1", "new_position": 0}

    response = await authenticated_client.post(
        "/api/queue/reorder", json=request_data
    )

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"

    mock_download_service.reorder_queue.assert_called_once_with(
        item_id="item-id-1", new_position=0
    )


@pytest.mark.asyncio
async def test_reorder_queue_not_found(
    authenticated_client, mock_download_service
):
    """Test reordering non-existent item returns 404."""
    mock_download_service.reorder_queue.return_value = False

    request_data = {"item_id": "non-existent", "new_position": 0}

    response = await authenticated_client.post(
        "/api/queue/reorder", json=request_data
    )

    assert response.status_code == 404


@pytest.mark.asyncio
async def test_clear_completed(authenticated_client, mock_download_service):
    """Test DELETE /api/queue/completed endpoint."""
    response = await authenticated_client.delete("/api/queue/completed")

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert data["count"] == 5

    mock_download_service.clear_completed.assert_called_once()


@pytest.mark.asyncio
async def test_retry_failed(authenticated_client, mock_download_service):
    """Test POST /api/queue/retry endpoint."""
    request_data = {"item_ids": ["item-id-3"]}

    response = await authenticated_client.post(
        "/api/queue/retry", json=request_data
    )

    assert response.status_code == 200
    data = response.json()

    assert data["status"] == "success"
    assert len(data["retried_ids"]) == 1

    mock_download_service.retry_failed.assert_called_once_with(
        ["item-id-3"]
    )


@pytest.mark.asyncio
async def test_retry_all_failed(authenticated_client, mock_download_service):
    """Test retrying all failed items with empty list."""
    request_data = {"item_ids": []}

    response = await authenticated_client.post(
        "/api/queue/retry", json=request_data
    )

    assert response.status_code == 200

    # Should call retry_failed with None to retry all
    mock_download_service.retry_failed.assert_called_once_with(None)


@pytest.mark.asyncio
async def test_queue_endpoints_require_auth(mock_download_service):
    """Test that all queue endpoints require authentication."""
    transport = ASGITransport(app=app)
    async with AsyncClient(
        transport=transport, base_url="http://test"
    ) as client:
        # Test all endpoints without auth
        endpoints = [
            ("GET", "/api/queue/status"),
            ("POST", "/api/queue/add"),
            ("DELETE", "/api/queue/item-1"),
            ("POST", "/api/queue/start"),
            ("POST", "/api/queue/stop"),
            ("POST", "/api/queue/pause"),
            ("POST", "/api/queue/resume"),
        ]

        for method, url in endpoints:
            if method == "GET":
                response = await client.get(url)
            elif method == "POST":
                response = await client.post(url, json={})
            elif method == "DELETE":
                response = await client.delete(url)

            # Should return 401 or 503 (503 if service not available)
            assert response.status_code in (401, 503), (
                f"{method} {url} should require auth, got {response.status_code}"
            )