import pytest
from unittest.mock import MagicMock, patch
from datetime import datetime
from apitest.models.test_models import (
    TestCase, TestResult, TestSuiteResult, HTTPMethod, PerformanceMetrics
)
from apitest.core.test_engine import TestEngine
from apitest.core.validation_engine import ValidationEngine
from apitest.models.exceptions import TestRunException


class TestTestEngine:
    """测试TestEngine测试引擎"""

    @pytest.fixture
    def mock_api_client(self):
        """模拟API客户端"""
        api_client = MagicMock()
        api_client.request.return_value = {
            "status_code": 200,
            "response_body": {"message": "success"},
            "response_headers": {"Content-Type": "application/json"},
            "performance": PerformanceMetrics(
                timestamp=datetime.now(),
                response_time=1000,
                request_size=100,
                response_size=200
            )
        }
        return api_client

    @pytest.fixture
    def mock_auth_manager(self):
        """模拟认证管理器"""
        auth_manager = MagicMock()
        auth_manager.get_auth_headers.return_value = {"Authorization": "Bearer token"}
        return auth_manager

    @pytest.fixture
    def mock_validation_engine(self):
        """模拟验证引擎"""
        validation_engine = MagicMock()
        validation_engine.validate_response.return_value = (True, "")
        return validation_engine

    @pytest.fixture
    def test_engine(self, mock_api_client, mock_auth_manager, mock_validation_engine):
        """创建测试引擎实例"""
        return TestEngine(
            api_client=mock_api_client,
            auth_manager=mock_auth_manager,
            validation_engine=mock_validation_engine
        )

    def test_test_engine_initialization(self, test_engine):
        """测试测试引擎初始化"""
        assert test_engine.api_client is not None
        assert test_engine.auth_manager is not None
        assert test_engine.validation_engine is not None
        assert test_engine._context == {}

    def test_set_context(self, test_engine):
        """测试设置上下文变量"""
        test_engine.set_context("user_id", "12345")
        assert test_engine.get_context("user_id") == "12345"

    def test_get_context_with_default(self, test_engine):
        """测试获取上下文变量（带默认值）"""
        assert test_engine.get_context("nonexistent", "default") == "default"

    def test_topological_sort_no_dependencies(self, test_engine):
        """测试拓扑排序（无依赖）"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={}
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={}
            )
        ]
        
        sorted_cases = test_engine._topological_sort(test_cases)
        assert len(sorted_cases) == 2

    def test_topological_sort_with_dependencies(self, test_engine):
        """测试拓扑排序（有依赖）"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                dependencies=[]
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                dependencies=["TC001"]
            ),
            TestCase(
                id="TC003",
                name="测试3",
                description="测试用例3",
                module="test",
                endpoint="/api/test3",
                method=HTTPMethod.GET,
                headers={},
                dependencies=["TC002"]
            )
        ]
        
        sorted_cases = test_engine._topological_sort(test_cases)
        assert len(sorted_cases) == 3
        assert sorted_cases[0].id == "TC001"
        assert sorted_cases[1].id == "TC002"
        assert sorted_cases[2].id == "TC003"

    def test_topological_sort_circular_dependency(self, test_engine):
        """测试拓扑排序（循环依赖）"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                dependencies=["TC002"]
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                dependencies=["TC001"]
            )
        ]
        
        with pytest.raises(TestRunException, match="存在循环依赖"):
            test_engine._topological_sort(test_cases)

    def test_resolve_context_variables_string(self, test_engine):
        """测试解析上下文变量（字符串）"""
        test_engine.set_context("user_id", "12345")
        result = test_engine._resolve_context_variables("${user_id}")
        assert result == "12345"

    def test_resolve_context_variables_dict(self, test_engine):
        """测试解析上下文变量（字典）"""
        test_engine.set_context("user_id", "12345")
        data = {"user_id": "${user_id}", "name": "test"}
        result = test_engine._resolve_context_variables(data)
        assert result == {"user_id": "12345", "name": "test"}

    def test_resolve_context_variables_list(self, test_engine):
        """测试解析上下文变量（列表）"""
        test_engine.set_context("user_id", "12345")
        data = ["${user_id}", "test"]
        result = test_engine._resolve_context_variables(data)
        assert result == ["12345", "test"]

    def test_execute_test_case_success(self, test_engine):
        """测试执行测试用例（成功）"""
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            validations=[{"type": "status_code", "value": 200}]
        )
        
        result = test_engine._execute_test_case(test_case)
        
        assert isinstance(result, TestResult)
        assert result.passed == True
        assert result.status_code == 200
        assert result.test_case == test_case

    def test_execute_test_case_with_auth(self, test_engine):
        """测试执行测试用例（带认证）"""
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            auth_required=True
        )
        
        result = test_engine._execute_test_case(test_case)
        
        assert result.passed == True
        test_engine.auth_manager.get_auth_headers.assert_called_once()

    def test_execute_test_case_failure(self, test_engine, mock_validation_engine):
        """测试执行测试用例（失败）"""
        mock_validation_engine.validate_response.return_value = (False, "验证失败")
        
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            validations=[{"type": "status_code", "value": 200}]
        )
        
        result = test_engine._execute_test_case(test_case)
        
        assert result.passed == False
        assert result.error_message == "验证失败"

    def test_execute_test_case_with_setup(self, test_engine):
        """测试执行测试用例（带前置操作）"""
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            setup={"type": "set_context", "key": "test_key", "value": "test_value"}
        )
        
        result = test_engine._execute_test_case(test_case)
        
        assert test_engine.get_context("test_key") == "test_value"

    def test_execute_test_case_with_teardown(self, test_engine):
        """测试执行测试用例（带后置操作）"""
        test_engine.set_context("test_key", "test_value")
        
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            teardown={"type": "clear_context", "key": "test_key"}
        )
        
        result = test_engine._execute_test_case(test_case)
        
        assert test_engine.get_context("test_key") is None

    def test_execute_test_suite(self, test_engine):
        """测试执行测试套件"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={}
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={}
            )
        ]
        
        result = test_engine.execute_test_suite(test_cases)
        
        assert isinstance(result, TestSuiteResult)
        assert len(result.results) == 2
        assert result.passed == 2
        assert result.failed == 0

    def test_execute_test_suite_with_dependencies(self, test_engine):
        """测试执行测试套件（有依赖）"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                dependencies=[]
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                dependencies=["TC001"]
            )
        ]
        
        result = test_engine.execute_test_suite(test_cases)
        
        assert len(result.results) == 2
        assert result.passed == 2

    def test_execute_test_suite_stop_on_failure(self, test_engine, mock_validation_engine):
        """测试执行测试套件（失败时停止）"""
        mock_validation_engine.validate_response.return_value = (False, "验证失败")
        
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={}
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={}
            )
        ]
        
        result = test_engine.execute_test_suite(test_cases, stop_on_failure=True)
        
        assert len(result.results) == 1
        assert result.passed == 0
        assert result.failed == 1

    def test_execute_test_suite_skip_disabled(self, test_engine):
        """测试执行测试套件（跳过已禁用的用例）"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                enabled=False
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                enabled=True
            )
        ]
        
        result = test_engine.execute_test_suite(test_cases)
        
        assert len(result.results) == 1
        assert result.skipped == 1

    def test_execute_test_cases_by_filter_module(self, test_engine):
        """测试按模块过滤执行测试用例"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="module1",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={}
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="module2",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={}
            )
        ]
        
        result = test_engine.execute_test_cases_by_filter(test_cases, module_filter="module1")
        
        assert len(result.results) == 1
        assert result.results[0].test_case.module == "module1"

    def test_execute_test_cases_by_filter_tag(self, test_engine):
        """测试按标签过滤执行测试用例"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                tags=["smoke", "regression"]
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                tags=["regression"]
            )
        ]
        
        result = test_engine.execute_test_cases_by_filter(test_cases, tag_filter=["smoke"])
        
        assert len(result.results) == 1
        assert "smoke" in result.results[0].test_case.tags

    def test_execute_test_cases_by_filter_priority(self, test_engine):
        """测试按优先级过滤执行测试用例"""
        test_cases = [
            TestCase(
                id="TC001",
                name="测试1",
                description="测试用例1",
                module="test",
                endpoint="/api/test1",
                method=HTTPMethod.GET,
                headers={},
                priority=1
            ),
            TestCase(
                id="TC002",
                name="测试2",
                description="测试用例2",
                module="test",
                endpoint="/api/test2",
                method=HTTPMethod.GET,
                headers={},
                priority=2
            )
        ]
        
        result = test_engine.execute_test_cases_by_filter(test_cases, priority_filter=1)
        
        assert len(result.results) == 1
        assert result.results[0].test_case.priority == 1

    def test_extract_response_data(self, test_engine):
        """测试提取响应数据到上下文"""
        test_case = TestCase(
            id="TC001",
            name="测试用例",
            description="测试用例描述",
            module="test",
            endpoint="/api/test",
            method=HTTPMethod.GET,
            headers={},
            validations=[{"type": "extract", "field": "user_id", "var_name": "extracted_id"}]
        )
        
        response_body = {"user_id": "12345", "name": "test"}
        test_engine._extract_response_data(test_case, response_body)
        
        assert test_engine.get_context("extracted_id") == "12345"