package logger

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"git.apinb.com/bsm-sdk/core/conf"
	"git.apinb.com/bsm-sdk/core/utils"
	"git.apinb.com/bsm-sdk/core/vars"
)

// Logger 日志器结构
type Logger struct {
	level       vars.LogLevel
	infoLogger  *log.Logger
	warnLogger  *log.Logger
	errorLogger *log.Logger
	fatalLogger *log.Logger
	debugLogger *log.Logger

	fileWriter    io.Writer
	consoleWriter io.Writer

	mu          sync.RWMutex
	name        string
	logDir      string
	currentDate string
	onRemote    bool
	endpoint    string
}

var (
	globalLogger *Logger
	once         sync.Once
)

// InitLogger 初始化全局日志器
func InitLogger(cfg *conf.LogConf) error {
	var err error
	once.Do(func() {
		globalLogger, err = NewLogger(cfg)
	})
	return err
}

// NewLogger 创建新的日志器
func NewLogger(cfg *conf.LogConf) (*Logger, error) {
	// 确保日志目录存在
	if err := os.MkdirAll(cfg.Dir, 0755); err != nil {
		return nil, fmt.Errorf("创建日志目录失败: %v", err)
	}

	// 控制台输出
	consoleWriter := os.Stdout

	// 文件输出
	fileWriter, err := createLogFile(cfg.Dir, cfg.Name)
	if err != nil {
		return nil, fmt.Errorf("创建日志文件失败: %v", err)
	}

	// 创建多输出写入器
	multiWriter := io.MultiWriter(consoleWriter, fileWriter)

	logger := &Logger{
		level:         vars.LogLevel(cfg.Level),
		fileWriter:    fileWriter,
		consoleWriter: consoleWriter,
		logDir:        cfg.Dir,
		name:          strings.ToLower(cfg.Name),
		currentDate:   time.Now().Format("2006-01-02"),
		onRemote:      cfg.Remote,
		endpoint:      cfg.Endpoint,
	}

	// 创建不同级别的日志器
	logger.infoLogger = log.New(multiWriter, "[INFO] ", log.LstdFlags)
	logger.warnLogger = log.New(multiWriter, "[WARN] ", log.LstdFlags)
	logger.errorLogger = log.New(multiWriter, "[ERROR] ", log.LstdFlags)
	logger.fatalLogger = log.New(multiWriter, "[FATAL] ", log.LstdFlags)
	logger.debugLogger = log.New(multiWriter, "[DEBUG] ", log.LstdFlags)

	return logger, nil
}

// createLogFile 创建日志文件
func createLogFile(logDir, name string) (io.Writer, error) {
	filename := fmt.Sprintf("%s_%s.log", name, time.Now().Format("2006-01-02"))
	filepath := filepath.Join(logDir, filename)

	file, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
	if err != nil {
		return nil, err
	}

	return file, nil
}

// checkAndRotateLog 检查并轮转日志文件
func (l *Logger) checkAndRotateLog() error {
	today := time.Now().Format("2006-01-02")
	if l.currentDate != today {
		l.mu.Lock()
		defer l.mu.Unlock()

		if l.currentDate != today {
			// 关闭旧文件
			if closer, ok := l.fileWriter.(io.Closer); ok {
				closer.Close()
			}

			// 创建新文件
			newFileWriter, err := createLogFile(l.logDir, l.name)
			if err != nil {
				return err
			}

			l.fileWriter = newFileWriter
			l.currentDate = today

			// 重新创建多输出写入器
			multiWriter := io.MultiWriter(l.consoleWriter, l.fileWriter)

			l.infoLogger = log.New(multiWriter, "[INFO] ", log.LstdFlags)
			l.warnLogger = log.New(multiWriter, "[WARN] ", log.LstdFlags)
			l.errorLogger = log.New(multiWriter, "[ERROR] ", log.LstdFlags)
			l.fatalLogger = log.New(multiWriter, "[FATAL] ", log.LstdFlags)
			l.debugLogger = log.New(multiWriter, "[DEBUG] ", log.LstdFlags)
		}
	}
	return nil
}

func (l *Logger) sendToRemote(level, name, out string) {
	if l.endpoint == "" {
		return
	}
	data := map[string]interface{}{
		"level": level,
		"name":  name,
		"out":   out,
	}
	jsonBytes, _ := json.Marshal(data)
	utils.HttpPost(l.endpoint, nil, jsonBytes)
}

// Debug 输出调试信息
func (l *Logger) Debug(v ...interface{}) {
	if l.level <= vars.DEBUG {
		l.checkAndRotateLog()
		out := fmt.Sprint(v...)
		if l.onRemote {
			go l.sendToRemote("DEBUG", l.name, out)
		}
		l.debugLogger.Output(2, out)
	}
}

// Debugf 格式化输出调试信息
func (l *Logger) Debugf(format string, v ...interface{}) {
	if l.level <= vars.DEBUG {
		l.checkAndRotateLog()
		out := fmt.Sprintf(format, v...)
		if l.onRemote {
			go l.sendToRemote("DEBUG", l.name, out)
		}
		l.debugLogger.Output(2, out)
	}
}

// Info 输出信息
func (l *Logger) Info(v ...interface{}) {
	if l.level <= vars.INFO {
		l.checkAndRotateLog()
		out := fmt.Sprint(v...)
		if l.onRemote {
			go l.sendToRemote("INFO", l.name, out)
		}
		l.infoLogger.Output(2, out)
	}
}

// Infof 格式化输出信息
func (l *Logger) Infof(format string, v ...interface{}) {
	if l.level <= vars.INFO {
		l.checkAndRotateLog()
		out := fmt.Sprintf(format, v...)
		if l.onRemote {
			go l.sendToRemote("INFO", l.name, out)
		}
		l.infoLogger.Output(2, out)
	}
}

// Warn 输出警告
func (l *Logger) Warn(v ...interface{}) {
	if l.level <= vars.WARN {
		l.checkAndRotateLog()
		out := fmt.Sprint(v...)
		if l.onRemote {
			go l.sendToRemote("WARN", l.name, out)
		}
		l.warnLogger.Output(2, out)
	}
}

// Warnf 格式化输出警告
func (l *Logger) Warnf(format string, v ...interface{}) {
	if l.level <= vars.WARN {
		l.checkAndRotateLog()
		out := fmt.Sprintf(format, v...)
		if l.onRemote {
			go l.sendToRemote("WARN", l.name, out)
		}
		l.warnLogger.Output(2, out)
	}
}

// Error 输出错误
func (l *Logger) Error(v ...interface{}) {
	if l.level <= vars.ERROR {
		l.checkAndRotateLog()
		out := fmt.Sprint(v...)
		if l.onRemote {
			go l.sendToRemote("ERROR", l.name, out)
		}
		l.errorLogger.Output(2, out)
	}
}

// Errorf 格式化输出错误
func (l *Logger) Errorf(format string, v ...interface{}) {
	if l.level <= vars.ERROR {
		l.checkAndRotateLog()
		out := fmt.Sprintf(format, v...)
		if l.onRemote {
			go l.sendToRemote("ERROR", l.name, out)
		}
		l.errorLogger.Output(2, out)
	}
}

// Fatal 输出致命错误并退出程序
func (l *Logger) Fatal(v ...interface{}) {
	l.checkAndRotateLog()
	out := fmt.Sprint(v...)
	if l.onRemote {
		go l.sendToRemote("FATAL", l.name, out)
	}
	l.fatalLogger.Output(2, out)
	os.Exit(1)
}

// Fatalf 格式化输出致命错误并退出程序
func (l *Logger) Fatalf(format string, v ...interface{}) {
	l.checkAndRotateLog()
	out := fmt.Sprintf(format, v...)
	if l.onRemote {
		go l.sendToRemote("FATAL", l.name, out)
	}
	l.fatalLogger.Output(2, out)
	os.Exit(1)
}

// Print 输出信息（兼容标准log包）
func (l *Logger) Print(v ...interface{}) {
	l.Info(v...)
}

// Printf 格式化输出信息（兼容标准log包）
func (l *Logger) Printf(format string, v ...interface{}) {
	l.Infof(format, v...)
}

// Println 输出信息并换行（兼容标准log包）
func (l *Logger) Println(v ...interface{}) {
	l.Info(v...)
}

// SetLevel 设置日志级别
func (l *Logger) SetLevel(level vars.LogLevel) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.level = level
}

// GetLevel 获取日志级别
func (l *Logger) GetLevel() vars.LogLevel {
	l.mu.RLock()
	defer l.mu.RUnlock()
	return l.level
}

// Close 关闭日志器
func (l *Logger) Close() error {
	if closer, ok := l.fileWriter.(io.Closer); ok {
		return closer.Close()
	}
	return nil
}

// 全局日志函数（兼容标准log包）

// Debug 全局调试日志
func Debug(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Debug(v...)
	}
}

// Debugf 全局调试日志
func Debugf(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Debugf(format, v...)
	}
}

// Info 全局信息日志
func Info(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Info(v...)
	}
}

// Infof 全局信息日志
func Infof(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Infof(format, v...)
	}
}

// Warn 全局警告日志
func Warn(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Warn(v...)
	}
}

// Warnf 全局警告日志
func Warnf(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Warnf(format, v...)
	}
}

// Error 全局错误日志
func Error(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Error(v...)
	}
}

// Errorf 全局错误日志
func Errorf(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Errorf(format, v...)
	}
}

// Fatal 全局致命错误日志
func Fatal(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Fatal(v...)
	}
}

// Fatalf 全局致命错误日志
func Fatalf(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Fatalf(format, v...)
	}
}

// Print 全局打印日志（兼容标准log包）
func Print(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Print(v...)
	}
}

// Printf 全局打印日志（兼容标准log包）
func Printf(format string, v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Printf(format, v...)
	}
}

// Println 全局打印日志（兼容标准log包）
func Println(v ...interface{}) {
	if globalLogger != nil {
		globalLogger.Println(v...)
	}
}

// GetLogger 获取全局日志器实例
func GetLogger() *Logger {
	return globalLogger
}