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
)

// 初始化Logger配置
func New(cfg *conf.LogConf) {
	if cfg == nil {
		cfg = &conf.LogConf{
			Name:     strings.ToLower(vars.ServiceKey),
			Level:    vars.LogLevel(vars.DEBUG),
			Dir:      "./logs/",
			Endpoint: "",
			Console:  true,
			File:     true,
			Remote:   false,
		}
	}

	InitLogger(cfg)
}

// 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:         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]any{
		"level": level,
		"name":  name,
		"out":   out,
	}
	jsonBytes, _ := json.Marshal(data)
	utils.HttpPost(l.endpoint, nil, jsonBytes)
}

func (l *Logger) loggerFor(level vars.LogLevel) (*log.Logger, string) {
	switch level {
	case vars.DEBUG:
		return l.debugLogger, "DEBUG"
	case vars.INFO:
		return l.infoLogger, "INFO"
	case vars.WARN:
		return l.warnLogger, "WARN"
	case vars.ERROR:
		return l.errorLogger, "ERROR"
	default:
		return l.fatalLogger, "FATAL"
	}
}

func (l *Logger) output(level vars.LogLevel, out string, fatal bool) {
	if !fatal && l.level > level {
		return
	}

	_ = l.checkAndRotateLog()
	logger, levelName := l.loggerFor(level)
	if fatal {
		logger = l.fatalLogger
		levelName = "FATAL"
	}
	if l.onRemote {
		go l.sendToRemote(levelName, l.name, out)
	}
	_ = logger.Output(3, out)

	if fatal {
		os.Exit(1)
	}
}

func (l *Logger) outputf(level vars.LogLevel, format string, v ...any) {
	l.output(level, fmt.Sprintf(format, v...), false)
}

// Debug 输出调试信息
func (l *Logger) Debug(v ...any) {
	l.output(vars.DEBUG, fmt.Sprint(v...), false)
}

// Debugf 格式化输出调试信息
func (l *Logger) Debugf(format string, v ...any) {
	l.outputf(vars.DEBUG, format, v...)
}

// Info 输出信息
func (l *Logger) Info(v ...any) {
	l.output(vars.INFO, fmt.Sprint(v...), false)
}

// Infof 格式化输出信息
func (l *Logger) Infof(format string, v ...any) {
	l.outputf(vars.INFO, format, v...)
}

// Warn 输出警告
func (l *Logger) Warn(v ...any) {
	l.output(vars.WARN, fmt.Sprint(v...), false)
}

// Warnf 格式化输出警告
func (l *Logger) Warnf(format string, v ...any) {
	l.outputf(vars.WARN, format, v...)
}

// Error 输出错误
func (l *Logger) Error(v ...any) {
	l.output(vars.ERROR, fmt.Sprint(v...), false)
}

// Errorf 格式化输出错误
func (l *Logger) Errorf(format string, v ...any) {
	l.outputf(vars.ERROR, format, v...)
}

// Fatal 输出致命错误并退出程序
func (l *Logger) Fatal(v ...any) {
	l.output(vars.ERROR, fmt.Sprint(v...), true)
}

// Fatalf 格式化输出致命错误并退出程序
func (l *Logger) Fatalf(format string, v ...any) {
	l.output(vars.ERROR, fmt.Sprintf(format, v...), true)
}

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

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

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

// Global logger functions.

func withGlobalLogger(fn func(*Logger)) {
	if globalLogger != nil {
		fn(globalLogger)
	}
}

func Debug(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Debug(v...) })
}

func Debugf(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Debugf(format, v...) })
}

func Info(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Info(v...) })
}

func Infof(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Infof(format, v...) })
}

func Warn(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Warn(v...) })
}

func Warnf(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Warnf(format, v...) })
}

func Error(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Error(v...) })
}

func Errorf(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Errorf(format, v...) })
}

func Fatal(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Fatal(v...) })
}

func Fatalf(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Fatalf(format, v...) })
}

func Print(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Print(v...) })
}

func Printf(format string, v ...any) {
	withGlobalLogger(func(l *Logger) { l.Printf(format, v...) })
}

func Println(v ...any) {
	withGlobalLogger(func(l *Logger) { l.Println(v...) })
}

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