package logger

import (
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"

	"git.toowon.com/jimmy/go-common/config"
)

// Logger 日志记录器
type Logger struct {
	infoLog  *log.Logger
	errorLog *log.Logger
	warnLog  *log.Logger
	debugLog *log.Logger
	config   *config.LoggerConfig
}

// NewLogger 创建日志记录器
func NewLogger(cfg *config.LoggerConfig) (*Logger, error) {
	if cfg == nil {
		// 使用默认配置
		cfg = &config.LoggerConfig{
			Level:    "info",
			Output:   "stdout",
			FilePath: "",
		}
	}

	// 设置默认值
	if cfg.Level == "" {
		cfg.Level = "info"
	}
	if cfg.Output == "" {
		cfg.Output = "stdout"
	}

	// 创建输出目标
	var writers []io.Writer
	switch cfg.Output {
	case "stdout":
		writers = append(writers, os.Stdout)
	case "stderr":
		writers = append(writers, os.Stderr)
	case "file":
		if cfg.FilePath == "" {
			return nil, fmt.Errorf("file path is required when output is file")
		}
		// 确保目录存在
		dir := filepath.Dir(cfg.FilePath)
		if err := os.MkdirAll(dir, 0755); err != nil {
			return nil, fmt.Errorf("failed to create log directory: %w", err)
		}
		file, err := os.OpenFile(cfg.FilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
		if err != nil {
			return nil, fmt.Errorf("failed to open log file: %w", err)
		}
		writers = append(writers, file)
	case "both":
		writers = append(writers, os.Stdout)
		if cfg.FilePath == "" {
			return nil, fmt.Errorf("file path is required when output is both")
		}
		dir := filepath.Dir(cfg.FilePath)
		if err := os.MkdirAll(dir, 0755); err != nil {
			return nil, fmt.Errorf("failed to create log directory: %w", err)
		}
		file, err := os.OpenFile(cfg.FilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
		if err != nil {
			return nil, fmt.Errorf("failed to open log file: %w", err)
		}
		writers = append(writers, file)
	default:
		return nil, fmt.Errorf("invalid output type: %s", cfg.Output)
	}

	// 创建多写入器
	multiWriter := io.MultiWriter(writers...)

	// 创建日志前缀
	prefix := ""
	if cfg.Prefix != "" {
		prefix = cfg.Prefix + " "
	}

	// 创建日志记录器
	logger := &Logger{
		config: cfg,
	}

	// 根据日志级别创建不同的logger
	flags := log.LstdFlags
	if cfg.DisableTimestamp {
		flags = 0
	}

	if cfg.Level == "debug" || cfg.Level == "info" || cfg.Level == "warn" || cfg.Level == "error" {
		logger.infoLog = log.New(multiWriter, prefix+"[INFO] ", flags)
		logger.warnLog = log.New(multiWriter, prefix+"[WARN] ", flags)
		logger.errorLog = log.New(multiWriter, prefix+"[ERROR] ", flags)
		if cfg.Level == "debug" {
			logger.debugLog = log.New(multiWriter, prefix+"[DEBUG] ", flags)
		}
	}

	return logger, nil
}

// Debug 记录调试日志
func (l *Logger) Debug(format string, v ...interface{}) {
	if l.debugLog != nil {
		l.debugLog.Printf(format, v...)
	}
}

// Info 记录信息日志
func (l *Logger) Info(format string, v ...interface{}) {
	if l.infoLog != nil {
		l.infoLog.Printf(format, v...)
	}
}

// Warn 记录警告日志
func (l *Logger) Warn(format string, v ...interface{}) {
	if l.warnLog != nil {
		l.warnLog.Printf(format, v...)
	}
}

// Error 记录错误日志
func (l *Logger) Error(format string, v ...interface{}) {
	if l.errorLog != nil {
		l.errorLog.Printf(format, v...)
	}
}

// Fatal 记录致命错误日志并退出程序
func (l *Logger) Fatal(format string, v ...interface{}) {
	if l.errorLog != nil {
		l.errorLog.Fatalf(format, v...)
	} else {
		log.Fatalf(format, v...)
	}
}

// Panic 记录恐慌日志并触发panic
func (l *Logger) Panic(format string, v ...interface{}) {
	if l.errorLog != nil {
		l.errorLog.Panicf(format, v...)
	} else {
		log.Panicf(format, v...)
	}
}

// WithFields 创建带字段的日志记录器（简化版，返回格式化字符串）
func (l *Logger) WithFields(fields map[string]interface{}) *Logger {
	// 返回自身，实际使用时可以在format中包含fields
	return l
}

// formatFields 格式化字段
func formatFields(fields map[string]interface{}) string {
	if len(fields) == 0 {
		return ""
	}
	result := ""
	for k, v := range fields {
		result += fmt.Sprintf("%s=%v ", k, v)
	}
	return result
}

// Debugf 记录调试日志（带字段）
func (l *Logger) Debugf(fields map[string]interface{}, format string, v ...interface{}) {
	if l.debugLog != nil {
		fieldStr := formatFields(fields)
		l.debugLog.Printf(fieldStr+format, v...)
	}
}

// Infof 记录信息日志（带字段）
func (l *Logger) Infof(fields map[string]interface{}, format string, v ...interface{}) {
	if l.infoLog != nil {
		fieldStr := formatFields(fields)
		l.infoLog.Printf(fieldStr+format, v...)
	}
}

// Warnf 记录警告日志（带字段）
func (l *Logger) Warnf(fields map[string]interface{}, format string, v ...interface{}) {
	if l.warnLog != nil {
		fieldStr := formatFields(fields)
		l.warnLog.Printf(fieldStr+format, v...)
	}
}

// Errorf 记录错误日志（带字段）
func (l *Logger) Errorf(fields map[string]interface{}, format string, v ...interface{}) {
	if l.errorLog != nil {
		fieldStr := formatFields(fields)
		l.errorLog.Printf(fieldStr+format, v...)
	}
}