"""
向量搜索处理器单元测试

测试向量搜索应用层的命令和查询处理器。
使用 Mock 仓储隔离外部依赖。
"""

import pytest
from unittest.mock import AsyncMock, MagicMock
from datetime import datetime

from src.application.vector_search.handlers import (
    CreateDocumentHandler,
    UpdateDocumentHandler,
    DeleteDocumentHandler,
    SearchDocumentsHandler,
    GetDocumentHandler
)
from src.application.vector_search.commands import (
    CreateDocumentCommand,
    UpdateDocumentCommand,
    DeleteDocumentCommand
)
from src.application.vector_search.queries import (
    SearchDocumentsQuery,
    GetDocumentQuery
)
from src.application.shared.exceptions import (
    ResourceNotFoundException,
    ValidationException,
    ApplicationException
)
from src.domain.vector_search.entities import Document, SearchResult
from src.domain.vector_search.value_objects import Vector, SearchQuery
from src.domain.shared.value_objects import EntityId, Timestamp
from src.domain.shared.exceptions import DomainException


class TestCreateDocumentHandler:
    """测试创建文档处理器"""
    
    @pytest.fixture
    def mock_repository(self):
        """创建 Mock 仓储"""
        repository = AsyncMock()
        repository.save = AsyncMock()
        return repository
    
    @pytest.fixture
    def handler(self, mock_repository):
        """创建处理器实例"""
        return CreateDocumentHandler(mock_repository)
    
    @pytest.mark.asyncio
    async def test_handle_creates_document_successfully(self, handler, mock_repository):
        """测试成功创建文档"""
        # Arrange
        command = CreateDocumentCommand(
            content="Test document content",
            metadata={"source": "test"}
        )
        
        # Act
        document_id = await handler.handle(command)
        
        # Assert
        assert document_id is not None
        assert isinstance(document_id, str)
        assert len(document_id) > 0
        
        # 验证仓储的 save 方法被调用
        mock_repository.save.assert_called_once()
        
        # 获取传递给 save 的文档
        saved_document = mock_repository.save.call_args[0][0]
        assert isinstance(saved_document, Document)
        assert saved_document.content == "Test document content"
        assert saved_document.metadata == {"source": "test"}
        assert saved_document.embedding is None  # 嵌入向量应该为 None
    
    @pytest.mark.asyncio
    async def test_handle_with_empty_metadata(self, handler, mock_repository):
        """测试使用空元数据创建文档"""
        # Arrange
        command = CreateDocumentCommand(
            content="Test content",
            metadata={}
        )
        
        # Act
        document_id = await handler.handle(command)
        
        # Assert
        assert document_id is not None
        mock_repository.save.assert_called_once()
    
    @pytest.mark.asyncio
    async def test_handle_raises_application_exception_on_repository_error(
        self, handler, mock_repository
    ):
        """测试仓储错误时抛出应用异常"""
        # Arrange
        command = CreateDocumentCommand(
            content="Test content",
            metadata={}
        )
        mock_repository.save.side_effect = Exception("Database error")
        
        # Act & Assert
        with pytest.raises(ApplicationException) as exc_info:
            await handler.handle(command)
        
        assert "Failed to create document" in str(exc_info.value)


class TestUpdateDocumentHandler:
    """测试更新文档处理器"""
    
    @pytest.fixture
    def mock_repository(self):
        """创建 Mock 仓储"""
        repository = AsyncMock()
        return repository
    
    @pytest.fixture
    def handler(self, mock_repository):
        """创建处理器实例"""
        return UpdateDocumentHandler(mock_repository)
    
    @pytest.fixture
    def existing_document(self):
        """创建现有文档"""
        return Document(
            id=EntityId("doc_123"),
            content="Original content",
            embedding=Vector([1.0, 2.0, 3.0]),
            metadata={"source": "test", "version": "1.0"},
            created_at=Timestamp.now(),
            updated_at=Timestamp.now()
        )
    
    @pytest.mark.asyncio
    async def test_handle_updates_content_successfully(
        self, handler, mock_repository, existing_document
    ):
        """测试成功更新文档内容"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=existing_document)
        mock_repository.save = AsyncMock()
        
        command = UpdateDocumentCommand(
            document_id="doc_123",
            content="Updated content"
        )
        
        # Act
        await handler.handle(command)
        
        # Assert
        mock_repository.find_by_id.assert_called_once()
        mock_repository.save.assert_called_once()
        
        # 验证文档内容已更新
        assert existing_document.content == "Updated content"
        # 验证嵌入向量已清除
        assert existing_document.embedding is None
    
    @pytest.mark.asyncio
    async def test_handle_updates_metadata_with_merge(
        self, handler, mock_repository, existing_document
    ):
        """测试合并更新元数据"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=existing_document)
        mock_repository.save = AsyncMock()
        
        command = UpdateDocumentCommand(
            document_id="doc_123",
            metadata={"author": "John"},
            merge_metadata=True
        )
        
        # Act
        await handler.handle(command)
        
        # Assert
        # 验证元数据已合并
        assert existing_document.metadata["source"] == "test"
        assert existing_document.metadata["version"] == "1.0"
        assert existing_document.metadata["author"] == "John"
    
    @pytest.mark.asyncio
    async def test_handle_updates_metadata_without_merge(
        self, handler, mock_repository, existing_document
    ):
        """测试替换更新元数据"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=existing_document)
        mock_repository.save = AsyncMock()
        
        command = UpdateDocumentCommand(
            document_id="doc_123",
            metadata={"author": "John"},
            merge_metadata=False
        )
        
        # Act
        await handler.handle(command)
        
        # Assert
        # 验证元数据已替换
        assert existing_document.metadata == {"author": "John"}
        assert "source" not in existing_document.metadata
        assert "version" not in existing_document.metadata
    
    @pytest.mark.asyncio
    async def test_handle_raises_not_found_when_document_does_not_exist(
        self, handler, mock_repository
    ):
        """测试文档不存在时抛出 ResourceNotFoundException"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=None)
        
        command = UpdateDocumentCommand(
            document_id="nonexistent_doc",
            content="New content"
        )
        
        # Act & Assert
        with pytest.raises(ResourceNotFoundException) as exc_info:
            await handler.handle(command)
        
        assert "Document" in str(exc_info.value)
        assert "nonexistent_doc" in str(exc_info.value)


class TestDeleteDocumentHandler:
    """测试删除文档处理器"""
    
    @pytest.fixture
    def mock_repository(self):
        """创建 Mock 仓储"""
        repository = AsyncMock()
        repository.delete = AsyncMock()
        return repository
    
    @pytest.fixture
    def handler(self, mock_repository):
        """创建处理器实例"""
        return DeleteDocumentHandler(mock_repository)
    
    @pytest.mark.asyncio
    async def test_handle_deletes_document_successfully(self, handler, mock_repository):
        """测试成功删除文档"""
        # Arrange
        command = DeleteDocumentCommand(document_id="doc_123")
        
        # Act
        await handler.handle(command)
        
        # Assert
        mock_repository.delete.assert_called_once()
        
        # 验证传递的文档 ID
        deleted_id = mock_repository.delete.call_args[0][0]
        assert str(deleted_id) == "doc_123"
    
    @pytest.mark.asyncio
    async def test_handle_raises_application_exception_on_repository_error(
        self, handler, mock_repository
    ):
        """测试仓储错误时抛出应用异常"""
        # Arrange
        command = DeleteDocumentCommand(document_id="doc_123")
        mock_repository.delete.side_effect = Exception("Database error")
        
        # Act & Assert
        with pytest.raises(ApplicationException) as exc_info:
            await handler.handle(command)
        
        assert "Failed to delete document" in str(exc_info.value)


class TestSearchDocumentsHandler:
    """测试搜索文档处理器"""
    
    @pytest.fixture
    def mock_repository(self):
        """创建 Mock 仓储"""
        repository = AsyncMock()
        return repository
    
    @pytest.fixture
    def handler(self, mock_repository):
        """创建处理器实例"""
        return SearchDocumentsHandler(mock_repository)
    
    @pytest.fixture
    def search_results(self):
        """创建搜索结果"""
        doc1 = Document(
            id=EntityId("doc_1"),
            content="Machine learning document",
            embedding=Vector([1.0, 2.0, 3.0]),
            metadata={"category": "AI"},
            created_at=Timestamp.now(),
            updated_at=Timestamp.now()
        )
        doc2 = Document(
            id=EntityId("doc_2"),
            content="Deep learning document",
            embedding=Vector([2.0, 3.0, 4.0]),
            metadata={"category": "AI"},
            created_at=Timestamp.now(),
            updated_at=Timestamp.now()
        )
        
        return [
            SearchResult(document=doc1, score=0.95, rank=0),
            SearchResult(document=doc2, score=0.85, rank=1)
        ]
    
    @pytest.mark.asyncio
    async def test_handle_searches_documents_successfully(
        self, handler, mock_repository, search_results
    ):
        """测试成功搜索文档"""
        # Arrange
        mock_repository.search = AsyncMock(return_value=search_results)
        
        query = SearchDocumentsQuery(
            query_text="machine learning",
            top_k=10
        )
        
        # Act
        results = await handler.handle(query)
        
        # Assert
        assert len(results) == 2
        assert results[0].document.id == "doc_1"
        assert results[0].score == 0.95
        assert results[1].document.id == "doc_2"
        assert results[1].score == 0.85
        
        mock_repository.search.assert_called_once()
    
    @pytest.mark.asyncio
    async def test_handle_with_filters(
        self, handler, mock_repository, search_results
    ):
        """测试带过滤条件的搜索"""
        # Arrange
        mock_repository.search = AsyncMock(return_value=search_results)
        
        query = SearchDocumentsQuery(
            query_text="machine learning",
            top_k=10,
            filters={"category": "AI"}
        )
        
        # Act
        results = await handler.handle(query)
        
        # Assert
        assert len(results) == 2
        mock_repository.search.assert_called_once()
        
        # 验证传递的搜索查询
        search_query = mock_repository.search.call_args[0][0]
        assert isinstance(search_query, SearchQuery)
        assert search_query.filters == {"category": "AI"}


class TestGetDocumentHandler:
    """测试获取文档处理器"""
    
    @pytest.fixture
    def mock_repository(self):
        """创建 Mock 仓储"""
        repository = AsyncMock()
        return repository
    
    @pytest.fixture
    def handler(self, mock_repository):
        """创建处理器实例"""
        return GetDocumentHandler(mock_repository)
    
    @pytest.fixture
    def existing_document(self):
        """创建现有文档"""
        return Document(
            id=EntityId("doc_123"),
            content="Test document",
            embedding=Vector([1.0, 2.0, 3.0]),
            metadata={"source": "test"},
            created_at=Timestamp.now(),
            updated_at=Timestamp.now()
        )
    
    @pytest.mark.asyncio
    async def test_handle_gets_document_successfully(
        self, handler, mock_repository, existing_document
    ):
        """测试成功获取文档"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=existing_document)
        
        query = GetDocumentQuery(document_id="doc_123")
        
        # Act
        result = await handler.handle(query)
        
        # Assert
        assert result.id == "doc_123"
        assert result.content == "Test document"
        assert result.metadata == {"source": "test"}
        
        mock_repository.find_by_id.assert_called_once()
    
    @pytest.mark.asyncio
    async def test_handle_raises_not_found_when_document_does_not_exist(
        self, handler, mock_repository
    ):
        """测试文档不存在时抛出 ResourceNotFoundException"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=None)
        
        query = GetDocumentQuery(document_id="nonexistent_doc")
        
        # Act & Assert
        with pytest.raises(ResourceNotFoundException) as exc_info:
            await handler.handle(query)
        
        assert "Document" in str(exc_info.value)
        assert "nonexistent_doc" in str(exc_info.value)
    
    @pytest.mark.asyncio
    async def test_handle_with_include_embedding(
        self, handler, mock_repository, existing_document
    ):
        """测试包含嵌入向量的获取"""
        # Arrange
        mock_repository.find_by_id = AsyncMock(return_value=existing_document)
        
        query = GetDocumentQuery(
            document_id="doc_123",
            include_embedding=True
        )
        
        # Act
        result = await handler.handle(query)
        
        # Assert
        assert result.embedding is not None
        assert result.embedding == [1.0, 2.0, 3.0]