// logger/boot_logger.go
package logger

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

type BootLoggerFactory struct {
}

var (
	bootLogFile *os.File
	bootLogger  *log.Logger
)

// InitBootLogger 初始化启动日志（只在启动阶段使用）
func InitBootLog() *BootLoggerFactory {

	if logToFile := os.Getenv("LOG_TO_FILE"); logToFile == "false" {
		return &BootLoggerFactory{}
	}

	// 1. 确保日志目录存在
	logDir := "logs"
	if err := os.MkdirAll(logDir, 0755); err != nil {
		log.Fatalf("创建日志目录失败: %v", err)
	}

	// 2. 创建启动日志文件
	timestamp := time.Now().Format("20060102-150405")
	filename := fmt.Sprintf("boot-%s-%s.log", serviceName, timestamp)
	filePath := filepath.Join(logDir, filename)

	file, err := os.Create(filePath)
	if err != nil {
		log.Fatalf("创建启动日志文件失败: %v", err)
	}

	bootLogFile = file

	// 3. 创建专门的bootLogger，同时输出到文件和控制台
	multiWriter := io.MultiWriter(os.Stdout, bootLogFile)
	bootLogger = log.New(multiWriter, "", log.LstdFlags|log.Lshortfile)

	// 4. 重定向标准库log到bootLogger（重要！）
	log.SetOutput(multiWriter)
	log.SetFlags(log.LstdFlags | log.Lshortfile)

	// 5. 记录启动信息
	BootLog("=== 服务启动开始 ===")
	BootLog("服务名称: %s", serviceName)
	BootLog("启动时间: %s", time.Now().Format("2006-01-02 15:04:05"))
	BootLog("启动日志文件: %s", filePath)

	return &BootLoggerFactory{}
}

// BootLog 启动阶段专用日志函数
func BootLog(format string, v ...interface{}) {
	if bootLogger != nil {
		// 使用bootLogger记录
		bootLogger.Printf(format, v...)
	} else {
		// 后备：直接使用标准库log
		log.Printf(format, v...)
	}
}

func (f *BootLoggerFactory) GetName() string {
	return "BootLoggerFactory"
}

// CloseBootLogger 关闭启动日志，切换到运行日志
func (f *BootLoggerFactory) Close() {
	if bootLogger != nil {
		BootLog("=== 启动阶段结束，切换到运行时日志 ===")
	}

	if bootLogFile != nil {
		bootLogFile.Close()
		bootLogFile = nil
	}

	bootLogger = nil
}