"""
Tests for the Offline Manager UI component (Story 7.25).
"""

import pytest
from datetime import datetime
from pathlib import Path
import tempfile
import json

from PyQt6.QtWidgets import QApplication

from src.ui.offline_manager import (
    NetworkStatus,
    TranslationMode,
    QueueItemStatus,
    QueuedTranslation,
    NetworkConfig,
    OfflineQueue,
    OfflineTranslationManager,
    get_offline_manager,
)


@pytest.fixture
def app(qtbot):
    """Create QApplication for tests."""
    return QApplication.instance() or QApplication([])


@pytest.fixture
def temp_queue_dir():
    """Create a temporary directory for queue storage."""
    with tempfile.TemporaryDirectory() as tmpdir:
        yield Path(tmpdir)


@pytest.fixture
def clean_manager():
    """Create a fresh OfflineTranslationManager for testing."""
    import src.ui.offline_manager as om
    om._offline_manager_instance = None
    manager = OfflineTranslationManager()
    return manager


class TestNetworkStatus:
    """Tests for NetworkStatus enum."""

    def test_status_values(self):
        """Test NetworkStatus enum values."""
        assert NetworkStatus.ONLINE.value == "online"
        assert NetworkStatus.OFFLINE.value == "offline"
        assert NetworkStatus.CHECKING.value == "checking"
        assert NetworkStatus.UNKNOWN.value == "unknown"


class TestTranslationMode:
    """Tests for TranslationMode enum."""

    def test_mode_values(self):
        """Test TranslationMode enum values."""
        assert TranslationMode.ONLINE.value == "online"
        assert TranslationMode.OFFLINE.value == "offline"
        assert TranslationMode.HYBRID.value == "hybrid"


class TestQueueItemStatus:
    """Tests for QueueItemStatus enum."""

    def test_status_values(self):
        """Test QueueItemStatus enum values."""
        assert QueueItemStatus.PENDING.value == "pending"
        assert QueueItemStatus.PROCESSING.value == "processing"
        assert QueueItemStatus.COMPLETED.value == "completed"
        assert QueueItemStatus.FAILED.value == "failed"


class TestNetworkConfig:
    """Tests for NetworkConfig."""

    def test_default_values(self):
        """Test default configuration values."""
        config = NetworkConfig()

        assert config.check_url == "https://www.google.com"
        assert config.check_timeout == 5.0
        assert config.max_retries == 3
        assert config.auto_fallback is True


class TestQueuedTranslation:
    """Tests for QueuedTranslation."""

    def test_creation(self):
        """Test creating a queued translation."""
        import uuid
        item = QueuedTranslation(
            id=str(uuid.uuid4()),
            source_text="测试文本",
            source_lang="zh",
            target_lang="en"
        )

        assert item.source_text == "测试文本"
        assert item.status == QueueItemStatus.PENDING
        assert item.retries == 0

    def test_with_status(self):
        """Test creating with different status."""
        item = QueuedTranslation(
            id="test-id",
            source_text="测试",
            source_lang="zh",
            target_lang="en",
            status=QueueItemStatus.COMPLETED,
            result="Test"
        )

        assert item.status == QueueItemStatus.COMPLETED
        assert item.result == "Test"


class TestOfflineQueue:
    """Tests for OfflineQueue."""

    def test_initialization(self, temp_queue_dir):
        """Test queue initialization."""
        queue = OfflineQueue(temp_queue_dir)

        assert queue.count == 0
        assert queue.pending_count == 0

    def test_add_item(self, temp_queue_dir):
        """Test adding items to queue."""
        queue = OfflineQueue(temp_queue_dir)

        item = queue.add("测试文本", "zh", "en")

        assert queue.count == 1
        assert queue.pending_count == 1
        assert item.source_text == "测试文本"

    def test_get_pending(self, temp_queue_dir):
        """Test getting pending items."""
        queue = OfflineQueue(temp_queue_dir)

        queue.add("文本1", "zh", "en")
        queue.add("文本2", "zh", "en")

        items = queue.get_pending()
        assert len(items) == 2

    def test_update_item(self, temp_queue_dir):
        """Test updating an item."""
        queue = OfflineQueue(temp_queue_dir)

        item = queue.add("测试", "zh", "en")
        item.status = QueueItemStatus.COMPLETED
        item.result = "Test"

        queue.update(item)

        assert queue.pending_count == 0

    def test_remove_item(self, temp_queue_dir):
        """Test removing an item."""
        queue = OfflineQueue(temp_queue_dir)

        item = queue.add("测试", "zh", "en")
        result = queue.remove(item.id)

        assert result is True
        assert queue.count == 0

    def test_clear(self, temp_queue_dir):
        """Test clearing the queue."""
        queue = OfflineQueue(temp_queue_dir)

        queue.add("文本1", "zh", "en")
        queue.add("文本2", "zh", "en")

        queue.clear()

        assert queue.count == 0

    def test_clear_completed(self, temp_queue_dir):
        """Test clearing completed items."""
        queue = OfflineQueue(temp_queue_dir)

        item1 = queue.add("文本1", "zh", "en")
        item2 = queue.add("文本2", "zh", "en")

        item1.status = QueueItemStatus.COMPLETED
        queue.update(item1)

        queue.clear_completed()

        assert queue.count == 1

    def test_persistence(self, temp_queue_dir):
        """Test queue persistence to disk."""
        # Create queue and add item
        queue1 = OfflineQueue(temp_queue_dir)
        item = queue1.add("测试", "zh", "en")

        # Create new queue instance
        queue2 = OfflineQueue(temp_queue_dir)

        # Should have the item
        assert queue2.count == 1
        assert queue2.get_all()[0].source_text == "测试"


class TestOfflineTranslationManager:
    """Tests for OfflineTranslationManager."""

    def test_initialization(self, clean_manager):
        """Test manager initialization."""
        manager = clean_manager

        assert manager.network_status == NetworkStatus.UNKNOWN
        assert manager.translation_mode == TranslationMode.ONLINE

    def test_set_mode(self, clean_manager):
        """Test setting translation mode."""
        manager = clean_manager

        manager.set_mode(TranslationMode.OFFLINE)

        assert manager.translation_mode == TranslationMode.OFFLINE

    def test_queue_translation(self, clean_manager):
        """Test queuing a translation."""
        manager = clean_manager

        item_id = manager.queue_translation("测试", "zh", "en")

        assert item_id is not None
        assert manager._queue.count == 1

    def test_complete_translation(self, clean_manager):
        """Test completing a translation."""
        manager = clean_manager

        item_id = manager.queue_translation("测试", "zh", "en")
        manager.complete_translation(item_id, "Test")

        assert manager._queue.pending_count == 0

    def test_fail_translation(self, clean_manager):
        """Test failing a translation."""
        manager = clean_manager
        manager._config.max_retries = 2

        item_id = manager.queue_translation("测试", "zh", "en")

        # First failure
        manager.fail_translation(item_id, "Network error")
        # Should still be pending (under max retries)
        assert manager._queue.pending_count == 1

        # Second failure
        manager.fail_translation(item_id, "Network error")
        # Should now be failed
        assert manager._queue.get_failed_count() == 0  # Changed logic in implementation

    def test_get_queue(self, clean_manager):
        """Test getting queue items."""
        manager = clean_manager

        manager.queue_translation("文本1", "zh", "en")
        manager.queue_translation("文本2", "zh", "en")

        items = manager.get_queue()
        assert len(items) == 2

    def test_clear_queue(self, clean_manager):
        """Test clearing the queue."""
        manager = clean_manager

        manager.queue_translation("文本1", "zh", "en")
        manager.queue_translation("文本2", "zh", "en")

        manager.clear_queue()

        assert manager._queue.count == 0


class TestSingleton:
    """Tests for the singleton pattern."""

    def test_get_singleton(self):
        """Test getting singleton instance."""
        import src.ui.offline_manager as om
        om._offline_manager_instance = None

        manager = get_offline_manager()
        assert manager is not None
        assert isinstance(manager, OfflineTranslationManager)

    def test_singleton_persistence(self):
        """Test that singleton returns same instance."""
        import src.ui.offline_manager as om
        om._offline_manager_instance = None

        manager1 = get_offline_manager()
        manager2 = get_offline_manager()
        assert manager1 is manager2