package main

import (
	"fmt"
	"os"
	"path/filepath"
	"sync"
	"time"
)

// Logger 简单文件日志（windowsgui 子系统无控制台，统一落盘）。
type Logger struct {
	mu   sync.Mutex
	file *os.File
	path string
}

func NewLogger() *Logger {
	dir := filepath.Join(appDataDir(), "logs")
	_ = os.MkdirAll(dir, 0o755)
	p := filepath.Join(dir, "tray-"+time.Now().Format("20060102")+".log")
	f, err := os.OpenFile(p, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
	if err != nil {
		f = nil
	}
	return &Logger{file: f, path: p}
}

func (l *Logger) Printf(format string, args ...any) {
	l.mu.Lock()
	defer l.mu.Unlock()
	line := fmt.Sprintf("[%s] %s\n", time.Now().Format("2006-01-02 15:04:05"), fmt.Sprintf(format, args...))
	if l.file != nil {
		_, _ = l.file.WriteString(line)
	}
}

func (l *Logger) Path() string {
	return l.path
}

func (l *Logger) Close() {
	l.mu.Lock()
	defer l.mu.Unlock()
	if l.file != nil {
		_ = l.file.Close()
		l.file = nil
	}
}