package logger

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"reflect"
	"runtime"
	"strings"
	"sync"
	"time"

	"github.com/sirupsen/logrus"
)

const (
	reset  = "\033[0m"
	red    = "\033[31m"
	green  = "\033[32m"
	yellow = "\033[33m"
	blue   = "\033[34m"
	cyan   = "\033[36m"
	white  = "\033[97m"
)

type colorFormatter struct{}

func (f *colorFormatter) Format(entry *logrus.Entry) ([]byte, error) {
	var levelColor string
	switch entry.Level {
	case logrus.DebugLevel:
		levelColor = cyan
	case logrus.InfoLevel:
		levelColor = green
	case logrus.WarnLevel:
		levelColor = yellow
	case logrus.ErrorLevel:
		levelColor = red
	case logrus.FatalLevel, logrus.PanicLevel:
		levelColor = red
	default:
		levelColor = white
	}

	timestamp := fmt.Sprintf("%s%s%s", levelColor, entry.Time.Format("01-02 15:04:05"), reset)

	file := "unknown"
	line := 0
	if entry.Caller != nil {
		file = entry.Caller.File
		if idx := strings.LastIndex(file, "/"); idx >= 0 {
			file = file[idx+1:]
		}
		line = entry.Caller.Line
	}

	title, _ := entry.Data["title"].(string)
	if title == "" {
		title = "-"
	}

	level := fmt.Sprintf("%s[%s]%s", levelColor, strings.ToUpper(entry.Level.String()), reset)
	titleStr := fmt.Sprintf("%s「%s」%s", levelColor, title, reset)

	msg := fmt.Sprintf("%s %s:%d: %s >> %s %s\n",
		timestamp, file, line, level, titleStr, entry.Message,
	)
	return []byte(msg), nil
}

var (
	instance     *logrus.Logger
	once         sync.Once
	cronInstance *logrus.Logger
	cronOnce     sync.Once
)

func GetLogger() *logrus.Logger {
	once.Do(func() {
		instance = logrus.New()

		switch strings.ToLower(os.Getenv("LOG_LEVEL")) {
		case "debug":
			instance.SetLevel(logrus.DebugLevel)
		case "info":
			instance.SetLevel(logrus.InfoLevel)
		case "warn":
			instance.SetLevel(logrus.WarnLevel)
		case "error":
			instance.SetLevel(logrus.ErrorLevel)
		case "fatal":
			instance.SetLevel(logrus.FatalLevel)
		default:
			instance.SetLevel(logrus.InfoLevel)
		}

		instance.SetFormatter(&colorFormatter{})
		instance.SetReportCaller(true)

		if os.Getenv("LOG_SAVE") == "true" {
			logDir := os.Getenv("LOG_SAVE_PATH")
			if logDir != "" {
				if err := os.MkdirAll(logDir, 0755); err != nil {
					instance.Errorf("创建日志目录失败: %v", err)
				} else {
					logFile := logDir + "/" + time.Now().Format("20060102") + ".log"
					f, err := os.OpenFile(logFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
					if err == nil {
						instance.SetOutput(io.MultiWriter(os.Stdout, f))
					}
				}
			}
		}
	})
	return instance
}

func callerSkip() *runtime.Frame {
	pcs := make([]uintptr, 10)
	n := runtime.Callers(3, pcs)
	frames := runtime.CallersFrames(pcs[:n])
	for {
		frame, more := frames.Next()
		if !strings.Contains(frame.File, "utils/logger/") {
			return &frame
		}
		if !more {
			break
		}
	}
	return nil
}

func toString(v interface{}) string {
	rv := reflect.ValueOf(v)
	if rv.Kind() == reflect.Struct || (rv.Kind() == reflect.Ptr && rv.Elem().Kind() == reflect.Struct) {
		data, err := json.Marshal(v)
		if err != nil {
			return fmt.Sprintf("%v", v)
		}
		return string(data)
	}
	return fmt.Sprintf("%v", v)
}

func joinToString(parts ...interface{}) string {
	strs := make([]string, 0, len(parts))
	for _, p := range parts {
		strs = append(strs, toString(p))
	}
	return strings.Join(strs, " ")
}

// GetCronLogger 返回定时任务专用 logger，写入独立日志文件
func GetCronLogger() *logrus.Logger {
	cronOnce.Do(func() {
		cronInstance = logrus.New()

		switch strings.ToLower(os.Getenv("LOG_LEVEL")) {
		case "debug":
			cronInstance.SetLevel(logrus.DebugLevel)
		case "info":
			cronInstance.SetLevel(logrus.InfoLevel)
		case "warn":
			cronInstance.SetLevel(logrus.WarnLevel)
		case "error":
			cronInstance.SetLevel(logrus.ErrorLevel)
		default:
			cronInstance.SetLevel(logrus.InfoLevel)
		}

		cronInstance.SetFormatter(&colorFormatter{})
		cronInstance.SetReportCaller(true)

		logDir := os.Getenv("LOG_SAVE_PATH")
		if logDir == "" {
			logDir = "./logs"
		}
		if err := os.MkdirAll(logDir, 0755); err != nil {
			cronInstance.SetOutput(os.Stdout)
			return
		}

		logFile := logDir + "/cron_" + time.Now().Format("20060102") + ".log"
		f, err := os.OpenFile(logFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
		if err != nil {
			cronInstance.SetOutput(os.Stdout)
			return
		}
		cronInstance.SetOutput(io.MultiWriter(os.Stdout, f))
	})
	return cronInstance
}

func CronDebug(title string, content ...interface{}) {
	GetCronLogger().WithField("title", title).Debug(joinToString(content...))
}

func CronInfo(title string, content ...interface{}) {
	GetCronLogger().WithField("title", title).Info(joinToString(content...))
}

func CronWarn(title string, content ...interface{}) {
	GetCronLogger().WithField("title", title).Warn(joinToString(content...))
}

func CronError(title string, content ...interface{}) {
	GetCronLogger().WithField("title", title).Error(joinToString(content...))
}

func Debug(title string, content ...interface{}) {
	GetLogger().WithField("title", title).Debug(joinToString(content...))
}

func Info(title string, content ...interface{}) {
	GetLogger().WithField("title", title).Info(joinToString(content...))
}

func Warn(title string, content ...interface{}) {
	GetLogger().WithField("title", title).Warn(joinToString(content...))
}

func Error(title string, content ...interface{}) {
	GetLogger().WithField("title", title).Error(joinToString(content...))
}

func Fatal(title string, content ...interface{}) {
	GetLogger().WithField("title", title).Fatal(joinToString(content...))
}