package unit

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/smartystreets/goconvey/convey"
	"github.com/subconverter-go/internal/logging"
)

// TestLoggerCreation 测试日志记录器的创建
func TestLoggerCreation(t *testing.T) {
	convey.Convey("日志记录器创建测试", t, func() {
		convey.Convey("创建默认日志记录器", func() {
			logger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)
			convey.So(logger, convey.ShouldNotBeNil)

			config := logger.GetConfig()
			convey.So(config, convey.ShouldNotBeNil)
			convey.So(config.Level, convey.ShouldEqual, "info")
			convey.So(config.Format, convey.ShouldEqual, "text")
			convey.So(config.Output, convey.ShouldEqual, "stdout")
		})

		convey.Convey("创建自定义配置日志记录器", func() {
			config := &logging.LoggingConfig{
				Level:        "debug",
				Format:       "json",
				Output:       "stdout",
				ReportCaller: true,
				EnableColor:  false,
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)
			convey.So(logger, convey.ShouldNotBeNil)

			actualConfig := logger.GetConfig()
			convey.So(actualConfig.Level, convey.ShouldEqual, "debug")
			convey.So(actualConfig.Format, convey.ShouldEqual, "json")
			convey.So(actualConfig.ReportCaller, convey.ShouldBeTrue)
		})

		convey.Convey("创建空配置日志记录器", func() {
			logger, err := logging.NewLogger(nil)
			convey.So(err, convey.ShouldBeNil)
			convey.So(logger, convey.ShouldNotBeNil)

			config := logger.GetConfig()
			convey.So(config, convey.ShouldNotBeNil)
			convey.So(config.Level, convey.ShouldEqual, "info") // 默认值
		})
	})
}

// TestLoggerConfiguration 测试日志配置功能
func TestLoggerConfiguration(t *testing.T) {
	convey.Convey("日志配置测试", t, func() {
		convey.Convey("无效配置处理", func() {
			config := &logging.LoggingConfig{
				Level: "invalid_level",
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldNotBeNil)
			convey.So(logger, convey.ShouldBeNil)
			convey.So(err.Error(), convey.ShouldContain, "invalid log level")
		})

		convey.Convey("动态更新配置", func() {
			logger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)

			newConfig := &logging.LoggingConfig{
				Level:   "debug",
				Format:  "json",
				Output:  "stdout",
				EnableColor: false,
			}

			err = logger.UpdateConfig(newConfig)
			convey.So(err, convey.ShouldBeNil)

			updatedConfig := logger.GetConfig()
			convey.So(updatedConfig.Level, convey.ShouldEqual, "debug")
			convey.So(updatedConfig.Format, convey.ShouldEqual, "json")
		})
	})
}

// TestLoggerOutput 测试日志输出功能
func TestLoggerOutput(t *testing.T) {
	convey.Convey("日志输出测试", t, func() {
		convey.Convey("标准输出测试", func() {
			// 重定向标准输出以捕获日志
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)

			logger.Info("Test message")

			// 恢复标准输出
			w.Close()
			os.Stdout = oldStdout

			// 读取捕获的输出
			output, _ := ioutil.ReadAll(r)
			convey.So(len(output) > 0, convey.ShouldBeTrue)
			convey.So(string(output), convey.ShouldContain, "Test message")
		})

		convey.Convey("文件输出测试", func() {
			tempDir := t.TempDir()
			logFile := filepath.Join(tempDir, "test.log")

			config := &logging.LoggingConfig{
				Level:    "info",
				Format:   "text",
				Output:   "file",
				FilePath: logFile,
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)

			logger.Info("File test message")

			// 等待日志写入
			time.Sleep(10 * time.Millisecond)

			// 读取日志文件
			content, err := ioutil.ReadFile(logFile)
			convey.So(err, convey.ShouldBeNil)
			convey.So(string(content), convey.ShouldContain, "File test message")

			// 清理
			logger.Close()
		})
	})
}

// TestLoggerLevels 测试不同日志级别
func TestLoggerLevels(t *testing.T) {
	convey.Convey("日志级别测试", t, func() {
		convey.Convey("Debug级别日志", func() {
			config := &logging.LoggingConfig{
				Level:   "debug",
				Format:  "text",
				Output:  "stdout",
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logger.Debug("Debug message")
			logger.Info("Info message")

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			outputStr := string(output)
			convey.So(outputStr, convey.ShouldContain, "Debug message")
			convey.So(outputStr, convey.ShouldContain, "Info message")
		})

		convey.Convey("Info级别日志", func() {
			config := &logging.LoggingConfig{
				Level:   "info",
				Format:  "text",
				Output:  "stdout",
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logger.Debug("Debug message") // 不应该输出
			logger.Info("Info message")   // 应该输出

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			outputStr := string(output)
			convey.So(outputStr, convey.ShouldNotContain, "Debug message")
			convey.So(outputStr, convey.ShouldContain, "Info message")
		})
	})
}

// TestLoggerFormats 测试不同日志格式
func TestLoggerFormats(t *testing.T) {
	convey.Convey("日志格式测试", t, func() {
		convey.Convey("Text格式", func() {
			config := &logging.LoggingConfig{
				Level:   "info",
				Format:  "text",
				Output:  "stdout",
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logger.Info("Text format test")

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			outputStr := string(output)
			convey.So(outputStr, convey.ShouldContain, "Text format test")
			convey.So(outputStr, convey.ShouldContain, "level=info") // text格式特征
		})

		convey.Convey("JSON格式", func() {
			config := &logging.LoggingConfig{
				Level:   "info",
				Format:  "json",
				Output:  "stdout",
			}

			logger, err := logging.NewLogger(config)
			convey.So(err, convey.ShouldBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logger.Info("JSON format test")

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			outputStr := string(output)
			convey.So(outputStr, convey.ShouldContain, "JSON format test")
			convey.So(outputStr, convey.ShouldContain, `"level":"info"`) // JSON格式特征
		})
	})
}

// TestLoggerWithFields 测试带字段的日志记录
func TestLoggerWithFields(t *testing.T) {
	convey.Convey("带字段日志测试", t, func() {
		logger, err := logging.NewDefaultLogger()
		convey.So(err, convey.ShouldBeNil)

		// 重定向输出
		oldStdout := os.Stdout
		r, w, _ := os.Pipe()
		os.Stdout = w

		fields := map[string]interface{}{
			"user_id":    "123",
			"request_id": "abc-def",
			"operation":  "test",
		}

		logger.WithFields(fields).Info("Message with fields")

		w.Close()
		os.Stdout = oldStdout

		output, _ := ioutil.ReadAll(r)
		outputStr := string(output)
		convey.So(outputStr, convey.ShouldContain, "Message with fields")
		convey.So(outputStr, convey.ShouldContain, "user_id=123")
		convey.So(outputStr, convey.ShouldContain, "request_id=abc-def")
		convey.So(outputStr, convey.ShouldContain, "operation=test")
	})
}

// TestLoggerLogEntry 测试使用LogEntry记录日志
func TestLoggerLogEntry(t *testing.T) {
	convey.Convey("LogEntry日志测试", t, func() {
		logger, err := logging.NewDefaultLogger()
		convey.So(err, convey.ShouldBeNil)

		// 重定向输出
		oldStdout := os.Stdout
		r, w, _ := os.Pipe()
		os.Stdout = w

		entry := logging.NewLogEntryWithLocation(logging.INFO, "Test with LogEntry").
			WithField("test_field", "test_value").
			WithError(fmt.Errorf("test error")).
			WithRequest("GET", "/test", 200).
			WithDuration(100 * time.Millisecond)

		err = logger.Log(entry)
		convey.So(err, convey.ShouldBeNil)

		w.Close()
		os.Stdout = oldStdout

		output, _ := ioutil.ReadAll(r)
		outputStr := string(output)
		convey.So(outputStr, convey.ShouldContain, "Test with LogEntry")
		convey.So(outputStr, convey.ShouldContain, "test_field=test_value")
		convey.So(outputStr, convey.ShouldContain, "test error")
		convey.So(outputStr, convey.ShouldContain, "method=GET")
		convey.So(outputStr, convey.ShouldContain, "path=/test")
		convey.So(outputStr, convey.ShouldContain, "status_code=200")
		convey.So(outputStr, convey.ShouldContain, "duration_ms=100")
	})
}

// TestLoggerSpecialMethods 测试特殊日志方法
func TestLoggerSpecialMethods(t *testing.T) {
	convey.Convey("特殊日志方法测试", t, func() {
		logger, err := logging.NewDefaultLogger()
		convey.So(err, convey.ShouldBeNil)

		// 重定向输出
		oldStdout := os.Stdout
		r, w, _ := os.Pipe()
		os.Stdout = w

		// 测试操作日志
		endOp := logger.LogOperation("test_operation", map[string]interface{}{"param": "value"})
		time.Sleep(10 * time.Millisecond) // 模拟操作耗时
		endOp()

		// 测试HTTP请求日志
		logger.LogHTTPRequest("GET", "/api/test", 200, 50*time.Millisecond, map[string]interface{}{"user_id": "123"})

		// 测试转换日志
		logger.LogConversion("clash", "https://example.com", 10, 100*time.Millisecond, true)

		// 测试代理验证日志
		logger.LogProxyValidation("test-proxy", "ss", true, 50, nil)

		w.Close()
		os.Stdout = oldStdout
		output, _ := ioutil.ReadAll(r)
		outputStr := string(output)

		convey.So(outputStr, convey.ShouldContain, "Operation started")
		convey.So(outputStr, convey.ShouldContain, "Operation completed")
		convey.So(outputStr, convey.ShouldContain, "test_operation")
		convey.So(outputStr, convey.ShouldContain, "GET /api/test - 200")
		convey.So(outputStr, convey.ShouldContain, "Conversion")
		convey.So(outputStr, convey.ShouldContain, "Proxy validation")
	})
}

// TestGlobalLogger 测试全局日志记录器
func TestGlobalLogger(t *testing.T) {
	convey.Convey("全局日志记录器测试", t, func() {
		convey.Convey("获取默认日志记录器", func() {
			logger := logging.GetDefaultLogger()
			convey.So(logger, convey.ShouldNotBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			logging.Info("Global logger test")

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			convey.So(len(output) > 0, convey.ShouldBeTrue)
		})

		convey.Convey("设置自定义全局日志记录器", func() {
			customLogger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)

			logging.SetDefaultLogger(customLogger)

			// 验证设置成功
			currentLogger := logging.GetDefaultLogger()
			convey.So(currentLogger, convey.ShouldEqual, customLogger)
		})
	})
}

// TestLoggerUtilities 测试日志工具函数
func TestLoggerUtilities(t *testing.T) {
	convey.Convey("日志工具函数测试", t, func() {
		convey.Convey("获取调用者信息", func() {
			file, line, funcName := logging.GetCallerInfo()
			convey.So(file, convey.ShouldNotBeEmpty)
			convey.So(line > 0, convey.ShouldBeTrue)
			convey.So(funcName, convey.ShouldNotBeEmpty)
		})
	})
}

// TestLoggerErrorHandling 测试错误处理
func TestLoggerErrorHandling(t *testing.T) {
	convey.Convey("日志错误处理测试", t, func() {
		convey.Convey("记录错误日志", func() {
			logger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)

			// 重定向输出
			oldStdout := os.Stdout
			r, w, _ := os.Pipe()
			os.Stdout = w

			testErr := fmt.Errorf("test error occurred")
			logger.WithError(testErr).Error("Error message")

			w.Close()
			os.Stdout = oldStdout

			output, _ := ioutil.ReadAll(r)
			outputStr := string(output)
			convey.So(outputStr, convey.ShouldContain, "Error message")
			convey.So(outputStr, convey.ShouldContain, "test error occurred")
		})

		convey.Convey("无效LogEntry处理", func() {
			logger, err := logging.NewDefaultLogger()
			convey.So(err, convey.ShouldBeNil)

			err = logger.Log(nil)
			convey.So(err, convey.ShouldNotBeNil)
			convey.So(err.Error(), convey.ShouldContain, "cannot be nil")
		})
	})
}