package utils

import (
	"encoding/json"
	"github.com/gin-gonic/gin"
	rotateLogs "github.com/lestrrat-go/file-rotatelogs"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"os"
	"psi/config"
	systemRes "psi/models/response"
	"sync"
	"time"
)

var loggerFactory map[string]*logrus.Logger

func InitLogger() error {
	var err error
	loggerFactory, err = NewLogger()
	if err != nil {
		return err
	}
	return nil
}

// GetLogger 获取日志配置（从 config.yaml 读取）
func GetLogger(conf interface{}) error {
	logConfig := config.AppConfig.Log

	switch v := conf.(type) {
	case *struct {
		Channel    map[string]string
		MaxAge     int
		RotateTime int
		RootPath   string
	}:
		v.Channel = logConfig.Channel
		v.MaxAge = logConfig.MaxAge
		v.RotateTime = logConfig.RotateTime
		v.RootPath = logConfig.RootPath
	default:
		return errors.New("不支持的配置类型")
	}

	return nil
}

// NewLogger 初始化日志
func NewLogger() (map[string]*logrus.Logger, error) {
	conf := struct {
		Channel    map[string]string
		MaxAge     int
		RotateTime int
		RootPath   string
	}{}

	if err := GetLogger(&conf); err != nil {
		return nil, errors.Wrap(err, "logger config get fail")
	}

	logger := make(map[string]*logrus.Logger, len(conf.Channel))

	var (
		wg    sync.WaitGroup
		mLock sync.Mutex
	)

	for k, v := range conf.Channel {
		wg.Add(1)
		go func(wg *sync.WaitGroup, channel string, path string, mLock sync.Locker) {
			defer func() {
				wg.Done()
			}()
			rootPath := conf.RootPath
			if rootPath == "" {
				rootPath = os.Getenv("run_path") + "/runtime/logs"
			}
			fullPath := rootPath + path
			log := createLogger(fullPath, conf.MaxAge, conf.RotateTime)
			mLock.Lock()
			logger[channel] = log
			mLock.Unlock()
		}(&wg, k, v, &mLock)
	}
	wg.Wait()

	return logger, nil
}

// 创建日志
func createLogger(path string, maxAge int, rotateTime int) *logrus.Logger {
	// 确保目录存在
	dir := path[:len(path)-len("/err.log")]
	if len(path) > 0 {
		// 提取目录路径
		lastSlash := -1
		for i := len(path) - 1; i >= 0; i-- {
			if path[i] == '/' || path[i] == '\\' {
				lastSlash = i
				break
			}
		}
		if lastSlash > 0 {
			dir = path[:lastSlash]
			if err := os.MkdirAll(dir, 0755); err != nil {
				logrus.Errorf("创建日志目录失败: %v, path: %s", err, dir)
			}
		}
	}

	writer, err := rotateLogs.New(
		path+"%Y%m%d%H%M",
		//rotateLogs.WithLinkName(path),
		rotateLogs.WithMaxAge(time.Duration(maxAge)*time.Hour),
		rotateLogs.WithRotationTime(time.Duration(rotateTime)*time.Hour),
	)
	if err != nil {
		logrus.Errorf("创建日志文件失败: %v, path: %s", err, path)
		// 如果创建失败，使用标准输出作为备选
		return createConsoleLogger()
	}

	log := new(logrus.Logger)
	log.SetFormatter(&logrus.JSONFormatter{})
	log.SetOutput(writer)
	log.SetLevel(logrus.InfoLevel)
	log.SetNoLock()
	return log
}

// 创建控制台日志器（备选方案）
func createConsoleLogger() *logrus.Logger {
	log := new(logrus.Logger)
	log.SetFormatter(&logrus.JSONFormatter{})
	log.SetOutput(os.Stdout)
	log.SetLevel(logrus.InfoLevel)
	return log
}

// ErrorLog LEVEL-ERROR
func ErrorLog(channel string, params logrus.Fields) {
	if _, ok := loggerFactory[channel]; !ok {
		return
	}
	loggerFactory[channel].WithFields(params).Error()
}

// InfoLog LEVEL-INFO
func InfoLog(channel string, params logrus.Fields) {
	if _, ok := loggerFactory[channel]; !ok {
		return
	}
	loggerFactory[channel].WithFields(params).Info(params)
}

// FailWithRequestLog 失败时记录请求参数并返回错误响应
// channel: 日志渠道（如 LoggerChannelWork, LoggerChannelRequest）
// source: 错误来源描述
// err: 错误对象
// c: gin上下文
// req: 请求参数（可选，传入会自动序列化到日志）
func FailWithRequestLog(channel string, source string, err error, c *gin.Context, req interface{}) {
	fields := logrus.Fields{
		"source":  source,
		"err_msg": err.Error(),
	}

	if req != nil {
		if reqJSON, jsonErr := json.Marshal(req); jsonErr == nil {
			fields["request_params"] = string(reqJSON)
		} else {
			fields["request_params_error"] = jsonErr.Error()
		}
	}

	ErrorLog(channel, fields)
	systemRes.FailWithMessage(err.Error(), c)
}