"""
Unit tests for FavoritesManager
"""
import pytest
import json
from pathlib import Path
from unittest.mock import patch, AsyncMock, mock_open

from app.favorites import FavoritesManager, get_favorites_manager


class TestFavoritesManagerInit:
    """Tests for FavoritesManager initialization"""

    def test_init_default_path(self, temp_dir):
        """Test FavoritesManager initialization with default path"""
        manager = FavoritesManager(storage_path=str(temp_dir / "favorites.json"))
        assert manager.storage_path == temp_dir / "favorites.json"
        assert manager._favorites == {}

    def test_init_creates_directory(self, temp_dir):
        """Test that initialization creates the parent directory"""
        storage_path = temp_dir / "subdir" / "favorites.json"
        assert not storage_path.parent.exists()

        manager = FavoritesManager(storage_path=str(storage_path))
        assert storage_path.parent.exists()
        assert storage_path.parent.is_dir()

    def test_global_manager_singleton(self):
        """Test that get_favorites_manager returns singleton"""
        manager1 = get_favorites_manager()
        manager2 = get_favorites_manager()
        assert manager1 is manager2


class TestFavoritesManagerLoad:
    """Tests for loading favorites from disk"""

    @pytest.mark.asyncio
    async def test_load_empty_file(self, favorites_manager):
        """Test loading from empty file"""
        await favorites_manager._load()
        assert favorites_manager._favorites == {}

    @pytest.mark.asyncio
    async def test_load_with_data(self, temp_dir):
        """Test loading favorites with data"""
        storage_path = temp_dir / "test_favorites.json"
        test_data = {
            "anime-1": {
                "id": "anime-1",
                "title": "Test Anime 1",
                "url": "https://example.com/anime1",
                "provider": "anime-sama"
            }
        }
        storage_path.write_text(json.dumps(test_data))

        manager = FavoritesManager(storage_path=str(storage_path))
        await manager._load()

        assert len(manager._favorites) == 1
        assert "anime-1" in manager._favorites
        assert manager._favorites["anime-1"]["title"] == "Test Anime 1"

    @pytest.mark.asyncio
    async def test_load_invalid_json(self, temp_dir):
        """Test loading invalid JSON"""
        storage_path = temp_dir / "invalid.json"
        storage_path.write_text("invalid json content {")

        manager = FavoritesManager(storage_path=str(storage_path))
        await manager._load()

        # Should default to empty dict on error
        assert manager._favorites == {}

    @pytest.mark.asyncio
    async def test_load_nonexistent_file(self, temp_dir):
        """Test loading when file doesn't exist"""
        storage_path = temp_dir / "nonexistent.json"
        assert not storage_path.exists()

        manager = FavoritesManager(storage_path=str(storage_path))
        await manager._load()

        assert manager._favorites == {}


class TestFavoritesManagerSave:
    """Tests for saving favorites to disk"""

    @pytest.mark.asyncio
    async def test_save_favorites(self, temp_dir):
        """Test saving favorites to disk"""
        storage_path = temp_dir / "test_save.json"
        manager = FavoritesManager(storage_path=str(storage_path))
        manager._favorites = {
            "anime-1": {"id": "anime-1", "title": "Test Anime"}
        }

        await manager._save()

        assert storage_path.exists()
        content = storage_path.read_text()
        saved_data = json.loads(content)
        assert saved_data == {"anime-1": {"id": "anime-1", "title": "Test Anime"}}


class TestFavoritesManagerAdd:
    """Tests for adding favorites"""

    @pytest.mark.asyncio
    async def test_add_favorite_new(self, favorites_manager):
        """Test adding a new favorite"""
        result = await favorites_manager.add_favorite(
            anime_id="anime-123",
            title="Test Anime",
            url="https://example.com/anime",
            provider="anime-sama",
            metadata={"genres": ["Action"]},
            poster_url="https://example.com/poster.jpg"
        )

        assert result["id"] == "anime-123"
        assert result["title"] == "Test Anime"
        assert result["url"] == "https://example.com/anime"
        assert result["provider"] == "anime-sama"
        assert result["metadata"]["genres"] == ["Action"]
        assert result["poster_url"] == "https://example.com/poster.jpg"
        assert "created_at" in result
        assert "updated_at" in result

        # Verify it was saved
        await favorites_manager._load()
        assert "anime-123" in favorites_manager._favorites

    @pytest.mark.asyncio
    async def test_add_favorite_minimal(self, favorites_manager):
        """Test adding favorite with minimal data"""
        result = await favorites_manager.add_favorite(
            anime_id="anime-456",
            title="Minimal Anime",
            url="https://example.com/minimal",
            provider="neko-sama"
        )

        assert result["id"] == "anime-456"
        assert result["metadata"] == {}
        assert result["poster_url"] is None

    @pytest.mark.asyncio
    async def test_add_favorite_update_existing(self, favorites_manager):
        """Test updating an existing favorite"""
        # Add initial favorite
        await favorites_manager.add_favorite(
            anime_id="anime-789",
            title="Original Title",
            url="https://example.com/anime",
            provider="anime-sama",
            metadata={"rating": "7.0/10"}
        )

        # Update with new metadata
        result = await favorites_manager.add_favorite(
            anime_id="anime-789",
            title="Updated Title",  # This won't update
            url="https://example.com/anime",
            provider="anime-sama",
            metadata={"rating": "8.5/10"},
            poster_url="https://example.com/new_poster.jpg"
        )

        # Title should remain the same, metadata and poster should update
        assert result["title"] == "Original Title"
        assert result["metadata"]["rating"] == "8.5/10"
        assert result["poster_url"] == "https://example.com/new_poster.jpg"

    @pytest.mark.asyncio
    async def test_add_favorite_preserves_created_at(self, favorites_manager):
        """Test that created_at is preserved on update"""
        await favorites_manager.add_favorite(
            anime_id="anime-time",
            title="Time Test",
            url="https://example.com",
            provider="anime-sama"
        )

        import time
        await asyncio.sleep(0.1)  # Small delay

        result = await favorites_manager.add_favorite(
            anime_id="anime-time",
            title="Time Test",
            url="https://example.com",
            provider="anime-sama",
            metadata={"new": "data"}
        )

        # updated_at should be newer than created_at
        from datetime import datetime
        created = datetime.fromisoformat(result["created_at"])
        updated = datetime.fromisoformat(result["updated_at"])
        assert updated > created


class TestFavoritesManagerRemove:
    """Tests for removing favorites"""

    @pytest.mark.asyncio
    async def test_remove_favorite_success(self, favorites_manager):
        """Test successfully removing a favorite"""
        # Add favorite first
        await favorites_manager.add_favorite(
            anime_id="anime-remove",
            title="Remove Me",
            url="https://example.com",
            provider="anime-sama"
        )

        # Remove it
        result = await favorites_manager.remove_favorite("anime-remove")
        assert result is True

        # Verify it's gone
        await favorites_manager._load()
        assert "anime-remove" not in favorites_manager._favorites

    @pytest.mark.asyncio
    async def test_remove_favorite_nonexistent(self, favorites_manager):
        """Test removing a non-existent favorite"""
        result = await favorites_manager.remove_favorite("nonexistent-id")
        assert result is False

    @pytest.mark.asyncio
    async def test_remove_multiple_favorites(self, favorites_manager):
        """Test removing multiple favorites"""
        # Add multiple favorites
        for i in range(5):
            await favorites_manager.add_favorite(
                anime_id=f"anime-{i}",
                title=f"Anime {i}",
                url=f"https://example.com/anime{i}",
                provider="anime-sama"
            )

        # Remove some
        await favorites_manager.remove_favorite("anime-1")
        await favorites_manager.remove_favorite("anime-3")

        await favorites_manager._load()
        assert len(favorites_manager._favorites) == 3
        assert "anime-1" not in favorites_manager._favorites
        assert "anime-3" not in favorites_manager._favorites


class TestFavoritesManagerGet:
    """Tests for getting favorites"""

    @pytest.mark.asyncio
    async def test_get_favorite_success(self, favorites_manager):
        """Test getting an existing favorite"""
        await favorites_manager.add_favorite(
            anime_id="anime-get",
            title="Get Test",
            url="https://example.com",
            provider="anime-sama"
        )

        result = await favorites_manager.get_favorite("anime-get")
        assert result is not None
        assert result["id"] == "anime-get"
        assert result["title"] == "Get Test"

    @pytest.mark.asyncio
    async def test_get_favorite_nonexistent(self, favorites_manager):
        """Test getting a non-existent favorite"""
        result = await favorites_manager.get_favorite("nonexistent-id")
        assert result is None


class TestFavoritesManagerList:
    """Tests for listing favorites"""

    @pytest.mark.asyncio
    async def test_list_favorites_empty(self, favorites_manager):
        """Test listing when no favorites exist"""
        result = await favorites_manager.list_favorites()
        assert result == []

    @pytest.mark.asyncio
    async def test_list_favorites_default_sort(self, favorites_manager):
        """Test listing favorites with default sorting"""
        # Add favorites with different timestamps
        import time
        for i in range(3):
            await favorites_manager.add_favorite(
                anime_id=f"anime-list-{i}",
                title=f"Anime {i}",
                url=f"https://example.com/{i}",
                provider="anime-sama"
            )
            await asyncio.sleep(0.05)  # Small delay for different timestamps

        result = await favorites_manager.list_favorites()
        assert len(result) == 3
        # Default is sort by created_at desc, so last added should be first
        assert result[0]["id"] == "anime-list-2"

    @pytest.mark.asyncio
    async def test_list_favorites_sort_by_title(self, favorites_manager):
        """Test sorting by title"""
        await favorites_manager.add_favorite("z-anime", "Z Anime", "https://example.com/z", "anime-sama")
        await asyncio.sleep(0.05)
        await favorites_manager.add_favorite("a-anime", "A Anime", "https://example.com/a", "anime-sama")

        result_asc = await favorites_manager.list_favorites(sort_by="title", order="asc")
        assert result_asc[0]["title"] == "A Anime"

        result_desc = await favorites_manager.list_favorites(sort_by="title", order="desc")
        assert result_desc[0]["title"] == "Z Anime"

    @pytest.mark.asyncio
    async def test_list_favorites_filter_by_provider(self, favorites_manager):
        """Test filtering by provider"""
        await favorites_manager.add_favorite("anime-1", "Anime 1", "https://example.com/1", "anime-sama")
        await favorites_manager.add_favorite("anime-2", "Anime 2", "https://example.com/2", "neko-sama")

        result = await favorites_manager.list_favorites(filter_provider="anime-sama")
        assert len(result) == 1
        assert result[0]["provider"] == "anime-sama"

    @pytest.mark.asyncio
    async def test_list_favorites_filter_by_genre(self, favorites_manager):
        """Test filtering by genre"""
        await favorites_manager.add_favorite(
            "anime-action",
            "Action Anime",
            "https://example.com/action",
            "anime-sama",
            metadata={"genres": ["Action", "Adventure"]}
        )
        await favorites_manager.add_favorite(
            "anime-drama",
            "Drama Anime",
            "https://example.com/drama",
            "anime-sama",
            metadata={"genres": ["Drama", "Romance"]}
        )

        result = await favorites_manager.list_favorites(filter_genre="Action")
        assert len(result) == 1
        assert result[0]["id"] == "anime-action"

    @pytest.mark.asyncio
    async def test_list_favorites_combined_filters(self, favorites_manager):
        """Test combining filters"""
        await favorites_manager.add_favorite(
            "anime-1",
            "Anime 1",
            "https://example.com/1",
            "anime-sama",
            metadata={"genres": ["Action"]}
        )
        await favorites_manager.add_favorite(
            "anime-2",
            "Anime 2",
            "https://example.com/2",
            "neko-sama",
            metadata={"genres": ["Action"]}
        )

        result = await favorites_manager.list_favorites(
            filter_provider="anime-sama",
            filter_genre="Action"
        )
        assert len(result) == 1
        assert result[0]["id"] == "anime-1"


class TestFavoritesManagerIsFavorite:
    """Tests for is_favorite method"""

    @pytest.mark.asyncio
    async def test_is_favorite_true(self, favorites_manager):
        """Test checking if anime is a favorite (true)"""
        await favorites_manager.add_favorite(
            "anime-check",
            "Check Anime",
            "https://example.com",
            "anime-sama"
        )

        result = await favorites_manager.is_favorite("anime-check")
        assert result is True

    @pytest.mark.asyncio
    async def test_is_favorite_false(self, favorites_manager):
        """Test checking if anime is a favorite (false)"""
        result = await favorites_manager.is_favorite("nonexistent-id")
        assert result is False


class TestFavoritesManagerToggle:
    """Tests for toggle_favorite method"""

    @pytest.mark.asyncio
    async def test_toggle_favorite_add(self, favorites_manager):
        """Test toggling to add a favorite"""
        result = await favorites_manager.toggle_favorite(
            anime_id="anime-toggle-add",
            title="Toggle Add",
            url="https://example.com",
            provider="anime-sama"
        )

        assert result["action"] == "added"
        assert result["anime_id"] == "anime-toggle-add"
        assert "favorite" in result

        # Verify it was added
        is_fav = await favorites_manager.is_favorite("anime-toggle-add")
        assert is_fav is True

    @pytest.mark.asyncio
    async def test_toggle_favorite_remove(self, favorites_manager):
        """Test toggling to remove a favorite"""
        # Add first
        await favorites_manager.add_favorite(
            "anime-toggle-remove",
            title="Toggle Remove",
            url="https://example.com",
            provider="anime-sama"
        )

        # Toggle to remove
        result = await favorites_manager.toggle_favorite(
            anime_id="anime-toggle-remove",
            title="Toggle Remove",
            url="https://example.com",
            provider="anime-sama"
        )

        assert result["action"] == "removed"
        assert result["anime_id"] == "anime-toggle-remove"

        # Verify it was removed
        is_fav = await favorites_manager.is_favorite("anime-toggle-remove")
        assert is_fav is False


class TestFavoritesManagerStats:
    """Tests for get_stats method"""

    @pytest.mark.asyncio
    async def test_get_stats_empty(self, favorites_manager):
        """Test getting stats with no favorites"""
        stats = await favorites_manager.get_stats()
        assert stats["total"] == 0
        assert stats["by_provider"] == {}
        assert stats["by_genre"] == {}

    @pytest.mark.asyncio
    async def test_get_stats_with_data(self, favorites_manager):
        """Test getting stats with favorites"""
        # Add favorites with different providers and genres
        await favorites_manager.add_favorite(
            "anime-1",
            "Anime 1",
            "https://example.com/1",
            "anime-sama",
            metadata={"genres": ["Action", "Adventure"]}
        )
        await favorites_manager.add_favorite(
            "anime-2",
            "Anime 2",
            "https://example.com/2",
            "anime-sama",
            metadata={"genres": ["Action"]}
        )
        await favorites_manager.add_favorite(
            "anime-3",
            "Anime 3",
            "https://example.com/3",
            "neko-sama",
            metadata={"genres": ["Drama"]}
        )

        stats = await favorites_manager.get_stats()
        assert stats["total"] == 3
        assert stats["by_provider"]["anime-sama"] == 2
        assert stats["by_provider"]["neko-sama"] == 1
        assert stats["by_genre"]["Action"] == 2
        assert stats["by_genre"]["Adventure"] == 1
        assert stats["by_genre"]["Drama"] == 1

    @pytest.mark.asyncio
    async def test_get_stats_multiple_genres(self, favorites_manager):
        """Test stats with anime having multiple genres"""
        await favorites_manager.add_favorite(
            "anime-multi",
            "Multi Genre Anime",
            "https://example.com",
            "anime-sama",
            metadata={"genres": ["Action", "Adventure", "Fantasy", "Comedy"]}
        )

        stats = await favorites_manager.get_stats()
        assert stats["by_genre"]["Action"] == 1
        assert stats["by_genre"]["Adventure"] == 1
        assert stats["by_genre"]["Fantasy"] == 1
        assert stats["by_genre"]["Comedy"] == 1


class TestFavoritesManagerConcurrency:
    """Tests for concurrent operations"""

    @pytest.mark.asyncio
    async def test_concurrent_add(self, favorites_manager):
        """Test adding favorites concurrently"""
        async def add_favorite(i):
            return await favorites_manager.add_favorite(
                f"concurrent-{i}",
                f"Concurrent {i}",
                f"https://example.com/{i}",
                "anime-sama"
            )

        tasks = [add_favorite(i) for i in range(10)]
        results = await asyncio.gather(*tasks)

        assert len(results) == 10

        # Verify all were added
        await favorites_manager._load()
        assert len(favorites_manager._favorites) == 10

    @pytest.mark.asyncio
    async def test_concurrent_read_write(self, favorites_manager):
        """Test concurrent reads and writes"""
        await favorites_manager.add_favorite("base", "Base", "https://example.com", "anime-sama")

        async def operations():
            tasks = []
            for i in range(5):
                tasks.append(favorites_manager.add_favorite(f"rw-{i}", f"RW {i}", "https://example.com", "anime-sama"))
                tasks.append(favorites_manager.list_favorites())
            results = await asyncio.gather(*tasks)
            return results

        results = await operations()
        assert len(results) == 10