package main

import (
	"crypto/tls"
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"
)

var (
	downloadDir = flag.String("dir", "./downloads", "下载目录")
	port        = flag.String("port", "55830", "服务端口")
)

type SaveImagesRequest struct {
	Title string            `json:"title"`
	Imgs  map[string]string `json:"imgs"`
}

// 下载详情
type DownloadDetail struct {
	Key     string `json:"key"`
	URL     string `json:"url"`
	Status  string `json:"status"` // success, skipped, failed
	Message string `json:"message"`
	SavedAs string `json:"saved_as,omitempty"`
}

// 响应结构
type SaveImagesResponse struct {
	Success  bool             `json:"success"`
	Message  string           `json:"message"`
	Title    string           `json:"title"`
	Folder   string           `json:"folder"`
	JsonPath string           `json:"json_path"`
	Total    int              `json:"total"`
	Saved    int              `json:"saved"`
	Skipped  int              `json:"skipped"`
	Failed   int              `json:"failed"`
	Details  []DownloadDetail `json:"details"`
}

// 文件夹信息结构
type FolderInfo struct {
	Title      string  `json:"title"`
	Folder     string  `json:"folder"`
	JsonPath   string  `json:"json_path"`
	Total      int     `json:"total"`
	Downloaded int     `json:"downloaded"`
	Progress   float64 `json:"progress"`
}

// 加载JSON数据
type JsonData struct {
	Title string            `json:"title"`
	Imgs  map[string]string `json:"imgs"`
}

func saveImagesHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusMethodNotAllowed)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "只支持POST请求",
		})
		return
	}

	// 解析请求
	var req SaveImagesRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "请求格式错误: " + err.Error(),
		})
		return
	}

	// 验证参数
	if req.Title == "" {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "标题不能为空",
		})
		return
	}
	if len(req.Imgs) == 0 {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "图片列表不能为空",
		})
		return
	}

	// 处理下载
	resp, err := processDownload(&req)
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "处理失败: " + err.Error(),
		})
		return
	}

	// 返回响应
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(resp)
}

func reloadFoldersHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusMethodNotAllowed)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "只支持GET请求",
		})
		return
	}

	folders, err := loadFolders()
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "加载文件夹失败: " + err.Error(),
		})
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"success": true,
		"folders": folders,
	})
}

func downloadMissingHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, `{"success": false, "message": "只支持POST请求"}`, http.StatusMethodNotAllowed)
		return
	}

	var req struct {
		Folder string `json:"folder"`
		Title  string `json:"title"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "请求格式错误: " + err.Error(),
		})
		return
	}

	if req.Folder == "" || req.Title == "" {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "参数不能为空",
		})
		return
	}

	resp, err := processMissingDownload(req.Folder, req.Title)
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "处理失败: " + err.Error(),
		})
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(resp)
}

func cleanupJsonHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusMethodNotAllowed)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "只支持POST请求",
		})
		return
	}

	count, err := cleanupJsonFiles()
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": false,
			"message": "清理失败: " + err.Error(),
		})
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"success": true,
		"message": fmt.Sprintf("已删除 %d 个JSON文件", count),
		"deleted": count,
	})
}

// 查找文件夹中的JSON文件（支持多种方式）
func findJsonFiles(folderPath string) ([]string, error) {
	jsonFiles := []string{}

	// 方法1: 标准glob
	pattern1 := filepath.Join(folderPath, "*.json")
	files1, _ := filepath.Glob(pattern1)
	jsonFiles = append(jsonFiles, files1...)

	// 方法2: 不区分大小写
	pattern2 := filepath.Join(folderPath, "*.JSON")
	files2, _ := filepath.Glob(pattern2)
	jsonFiles = append(jsonFiles, files2...)

	// 方法3: 使用ReadDir手动查找（最可靠）
	files3, err := os.ReadDir(folderPath)
	if err != nil {
		return jsonFiles, err
	}

	for _, file := range files3 {
		if !file.IsDir() {
			name := strings.ToLower(file.Name())
			if strings.HasSuffix(name, ".json") {
				fullPath := filepath.Join(folderPath, file.Name())
				// 去重
				found := false
				for _, existing := range jsonFiles {
					if existing == fullPath {
						found = true
						break
					}
				}
				if !found {
					jsonFiles = append(jsonFiles, fullPath)
				}
			}
		}
	}

	return jsonFiles, nil
}

func loadFolders() ([]FolderInfo, error) {
	folders := []FolderInfo{}

	fmt.Println("=== 开始扫描下载目录 ===")
	fmt.Println("下载目录绝对路径:", *downloadDir)

	// 获取绝对路径
	absDownloadDir, _ := filepath.Abs(*downloadDir)
	fmt.Println("下载目录绝对路径:", absDownloadDir)

	entries, err := os.ReadDir(absDownloadDir)
	if err != nil {
		fmt.Printf("读取目录失败: %v\n", err)
		return nil, err
	}

	for i, entry := range entries {
		if entry.IsDir() {
			folderPath := filepath.Join(absDownloadDir, entry.Name())
			fmt.Printf("  处理文件夹: %s\n", folderPath)

			// 使用通用函数查找JSON文件
			jsonFiles, err := findJsonFiles(folderPath)
			if err != nil {
				fmt.Printf("  查找JSON文件失败: %v\n", err)
				continue
			}

			for j, jsonFile := range jsonFiles {
				fmt.Printf("    [%d] %s\n", j, jsonFile)
			}

			if len(jsonFiles) == 0 {
				fmt.Println("  没有JSON文件，跳过")
				continue
			}

			// 读取JSON文件
			for _, jsonFile := range jsonFiles {
				fmt.Printf("  处理JSON文件: %s\n", jsonFile)

				// 检查文件是否存在
				if _, err := os.Stat(jsonFile); os.IsNotExist(err) {
					fmt.Printf("  ❌ JSON文件不存在\n")
					continue
				}

				data, err := os.ReadFile(jsonFile)
				if err != nil {
					fmt.Printf("  读取JSON文件失败: %v\n", err)
					continue
				}

				fmt.Printf("  成功读取JSON文件，大小: %d bytes\n", len(data))

				var jsonData JsonData
				if err := json.Unmarshal(data, &jsonData); err != nil {
					fmt.Printf("  解析JSON失败: %v\n", err)
					fmt.Printf("  文件内容前100字节: %s\n", string(data[:min(100, len(data))]))
					continue
				}

				fmt.Printf("  JSON解析成功: title='%s', imgs数量=%d\n", jsonData.Title, len(jsonData.Imgs))

				if len(jsonData.Imgs) == 0 {
					fmt.Println("  JSON中没有图片数据，跳过")
					continue
				}

				// 统计实际已下载的图片数量（与JSON中的key匹配）
				downloaded := 0
				files, _ := os.ReadDir(folderPath)

				fmt.Printf("  文件夹中总文件数: %d\n", len(files))

				// 创建已存在文件的map
				existingFiles := make(map[string]bool)
				for _, file := range files {
					if !file.IsDir() && !strings.HasSuffix(strings.ToLower(file.Name()), ".json") {
						// 提取序号（去掉扩展名）
						ext := filepath.Ext(file.Name())
						key := strings.TrimSuffix(file.Name(), ext)
						existingFiles[key] = true
						fmt.Printf("    文件: %s -> key: %s\n", file.Name(), key)
					}
				}

				fmt.Println("  检查JSON中的key匹配情况:")
				// 检查JSON中的每个key是否都有对应的文件
				missingKeys := []string{}
				for key := range jsonData.Imgs {
					if existingFiles[key] {
						downloaded++
						fmt.Printf("    ✓ 存在: key=%s\n", key)
					} else {
						missingKeys = append(missingKeys, key)
						fmt.Printf("    ✗ 缺失: key=%s\n", key)
					}
				}

				// 计算进度
				total := len(jsonData.Imgs)
				progress := 0.0
				if total > 0 {
					progress = float64(downloaded) / float64(total) * 100
				}

				fmt.Printf("  统计结果: 总=%d, 已下载=%d, 缺失=%d, 进度=%.2f%%\n",
					total, downloaded, len(missingKeys), progress)

				// 显示所有未完成的任务（包括部分完成的）
				folders = append(folders, FolderInfo{
					Title:      jsonData.Title,
					Folder:     folderPath,
					JsonPath:   jsonFile,
					Total:      total,
					Downloaded: downloaded,
					Progress:   progress,
				})

				fmt.Printf("  添加到列表: title='%s', progress=%.2f%%\n", jsonData.Title, progress)
			}
		}
	}

	fmt.Printf("\n=== 扫描完成，共找到 %d 个文件夹 ===\n", len(folders))
	return folders, nil
}

func processMissingDownload(folderPath, title string) (*SaveImagesResponse, error) {
	fmt.Printf("=== 开始处理缺失文件下载 ===\n")
	fmt.Printf("文件夹: %s\n", folderPath)
	fmt.Printf("标题: %s\n", title)

	// 使用通用函数查找JSON文件
	jsonFiles, err := findJsonFiles(folderPath)
	if err != nil || len(jsonFiles) == 0 {
		fmt.Printf("未找到JSON文件，错误: %v\n", err)
		return nil, fmt.Errorf("未找到JSON文件")
	}

	fmt.Printf("找到JSON文件: %s\n", jsonFiles[0])

	// 读取JSON文件
	data, err := os.ReadFile(jsonFiles[0])
	if err != nil {
		fmt.Printf("读取JSON文件失败: %v\n", err)
		return nil, fmt.Errorf("读取JSON文件失败: %v", err)
	}

	var jsonData JsonData
	if err := json.Unmarshal(data, &jsonData); err != nil {
		fmt.Printf("解析JSON失败: %v\n", err)
		return nil, fmt.Errorf("解析JSON失败: %v", err)
	}

	fmt.Printf("JSON解析成功: title='%s', imgs数量=%d\n", jsonData.Title, len(jsonData.Imgs))

	// 检查现有文件 - 修正为只统计与JSON key匹配的文件
	existingFiles := make(map[string]bool)
	files, _ := os.ReadDir(folderPath)

	fmt.Printf("文件夹中总文件数: %d\n", len(files))

	for _, file := range files {
		if !file.IsDir() && !strings.HasSuffix(strings.ToLower(file.Name()), ".json") {
			// 提取序号（去掉扩展名）
			ext := filepath.Ext(file.Name())
			key := strings.TrimSuffix(file.Name(), ext)
			existingFiles[key] = true
		}
	}

	// 准备下载缺失的文件
	needDownload := make(map[string]string)
	missingCount := 0

	fmt.Println("检查缺失文件:")
	for key, url := range jsonData.Imgs {
		if !existingFiles[key] {
			needDownload[key] = url
			missingCount++
			fmt.Printf("  ✗ 缺失: key=%s\n", key)
		} else {
			fmt.Printf("  ✓ 存在: key=%s\n", key)
		}
	}

	// 计算已下载数量（基于JSON中实际存在的key）
	downloadedCount := 0
	for key := range jsonData.Imgs {
		if existingFiles[key] {
			downloadedCount++
		}
	}

	fmt.Printf("统计: 总文件=%d, 已下载=%d, 缺失=%d\n",
		len(jsonData.Imgs), downloadedCount, missingCount)

	if len(needDownload) == 0 {
		fmt.Println("所有文件都已存在，无需下载")
		return &SaveImagesResponse{
			Success:  true,
			Message:  "所有图片已下载完成",
			Title:    title,
			Folder:   folderPath,
			JsonPath: jsonFiles[0],
			Total:    len(jsonData.Imgs),
			Saved:    0,
			Skipped:  len(jsonData.Imgs),
			Failed:   0,
		}, nil
	}

	fmt.Printf("开始下载 %d 个缺失文件...\n", len(needDownload))

	// 下载缺失图片
	saved := 0
	failed := 0
	details := make([]DownloadDetail, 0, len(needDownload))

	for key, url := range needDownload {
		details = append(details, DownloadDetail{
			Key:     key,
			URL:     url,
			Status:  "pending",
			Message: "等待下载",
		})
	}

	successMap, errors := downloadImages(needDownload, folderPath)
	_ = successMap

	for i, detail := range details {
		if detail.Status == "pending" {
			if err, ok := errors[detail.Key]; ok {
				details[i].Status = "failed"
				details[i].Message = err.Error()
				failed++
				fmt.Printf("下载失败: key=%s, error=%v\n", detail.Key, err)
			} else {
				ext := getFileExtension(detail.URL)
				filename := detail.Key + ext
				details[i].Status = "success"
				details[i].Message = "下载成功"
				details[i].SavedAs = filename
				saved++
				fmt.Printf("下载成功: key=%s\n", detail.Key)
			}
		}
	}

	skipped := len(jsonData.Imgs) - saved - failed

	fmt.Printf("下载完成: 新增=%d, 跳过=%d, 失败=%d\n", saved, skipped, failed)

	return &SaveImagesResponse{
		Success:  failed == 0,
		Message:  fmt.Sprintf("下载完成: 新增%d张, 跳过%d张, 失败%d张", saved, skipped, failed),
		Title:    title,
		Folder:   folderPath,
		JsonPath: jsonFiles[0],
		Total:    len(jsonData.Imgs),
		Saved:    saved,
		Skipped:  skipped,
		Failed:   failed,
		Details:  details,
	}, nil
}

func cleanupJsonFiles() (int, error) {
	count := 0

	err := filepath.Walk(*downloadDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if !info.IsDir() && strings.HasSuffix(strings.ToLower(info.Name()), ".json") {
			if err := os.Remove(path); err == nil {
				count++
			}
		}

		return nil
	})

	return count, err
}

func processDownload(req *SaveImagesRequest) (*SaveImagesResponse, error) {
	// 清理标题（移除非法字符）
	cleanTitle := cleanFilename(req.Title)

	// 创建目录
	comicDir := filepath.Join(*downloadDir, cleanTitle)
	if err := os.MkdirAll(comicDir, 0755); err != nil {
		return nil, fmt.Errorf("创建目录失败: %v", err)
	}

	// JSON文件路径
	jsonFilename := cleanTitle + ".json"
	jsonPath := filepath.Join(comicDir, jsonFilename)

	// 检查现有文件
	existingFiles := make(map[string]bool)
	files, _ := os.ReadDir(comicDir)
	for _, file := range files {
		if !file.IsDir() {
			filename := file.Name()
			if strings.HasSuffix(filename, ".json") {
				continue
			}
			// 提取序号（去掉扩展名）
			ext := filepath.Ext(filename)
			key := strings.TrimSuffix(filename, ext)
			existingFiles[key] = true
		}
	}

	// 准备下载
	details := make([]DownloadDetail, 0, len(req.Imgs))
	needDownload := make(map[string]string)

	for key, url := range req.Imgs {
		// 获取文件扩展名
		ext := getFileExtension(url)
		filename := key + ext

		if existingFiles[key] {
			// 文件已存在，跳过
			details = append(details, DownloadDetail{
				Key:     key,
				URL:     url,
				Status:  "skipped",
				Message: "文件已存在",
				SavedAs: filename,
			})
			continue
		}

		// 需要下载
		needDownload[key] = url
		details = append(details, DownloadDetail{
			Key:     key,
			URL:     url,
			Status:  "pending",
			Message: "等待下载",
		})
	}

	// 下载图片
	var saved, failed int
	if len(needDownload) > 0 {
		successMap, errors := downloadImages(needDownload, comicDir)

		// 使用 successMap 来检查哪些下载成功
		// 虽然我们不直接使用 successMap，但它用于 downloadImages 函数的返回值
		_ = successMap // 明确标记为使用（避免未使用警告）

		// 更新下载详情
		for i, detail := range details {
			if detail.Status == "pending" {
				if err, ok := errors[detail.Key]; ok {
					details[i].Status = "failed"
					details[i].Message = err.Error()
					failed++
				} else {
					ext := getFileExtension(detail.URL)
					filename := detail.Key + ext
					details[i].Status = "success"
					details[i].Message = "下载成功"
					details[i].SavedAs = filename
					saved++
				}
			}
		}
	}

	// 保存JSON文件
	skipped := len(req.Imgs) - saved - failed
	finalImgs := make(map[string]string)
	for key, url := range req.Imgs {
		finalImgs[key] = url
	}

	saveJSON(comicDir, jsonFilename, req.Title, finalImgs)

	// 构建响应
	return &SaveImagesResponse{
		Success:  failed == 0,
		Message:  fmt.Sprintf("下载完成: 新增%d张, 跳过%d张, 失败%d张", saved, skipped, failed),
		Title:    req.Title,
		Folder:   comicDir,
		JsonPath: jsonPath,
		Total:    len(req.Imgs),
		Saved:    saved,
		Skipped:  skipped,
		Failed:   failed,
		Details:  details,
	}, nil
}

func saveJSON(dir, filename, title string, imgs map[string]string) error {
	data := map[string]interface{}{
		"title":      title,
		"imgs":       imgs,
		"created_at": time.Now().Format("2006-01-02 15:04:05"),
		"updated_at": time.Now().Format("2006-01-02 15:04:05"),
	}

	jsonData, err := json.MarshalIndent(data, "", "  ")
	if err != nil {
		return err
	}

	path := filepath.Join(dir, filename)
	return os.WriteFile(path, jsonData, 0644)
}

func cleanFilename(filename string) string {
	illegalChars := []string{"/", "\\", ":", "*", "?", "\"", "<", ">", "|", "\n", "\r", "\t"}
	result := filename
	for _, char := range illegalChars {
		result = strings.ReplaceAll(result, char, "_")
	}
	if len(result) > 200 {
		result = result[:200]
	}
	return strings.TrimSpace(result)
}

func getFileExtension(url string) string {
	// 默认扩展名
	ext := ".jpg"

	// 从URL提取扩展名
	if idx := strings.LastIndex(url, "."); idx != -1 {
		fileExt := strings.ToLower(url[idx:])
		// 检查是否为常见图片格式
		validExts := []string{".jpg", ".jpeg", ".png", ".webp", ".gif", ".bmp", ".tiff"}
		for _, validExt := range validExts {
			if strings.HasPrefix(fileExt, validExt) {
				ext = validExt
				break
			}
		}
	}

	return ext
}

func downloadImages(images map[string]string, dir string) (map[string]bool, map[string]error) {
	var mu sync.Mutex
	var wg sync.WaitGroup

	success := make(map[string]bool)
	errors := make(map[string]error)

	// 并发控制：最多同时下载5张图片
	semaphore := make(chan struct{}, 5)

	for key, url := range images {
		wg.Add(1)

		go func(key, url string) {
			defer wg.Done()

			// 获取信号量
			semaphore <- struct{}{}
			defer func() { <-semaphore }()

			// 下载图片
			err := downloadImage(url, dir, key)

			mu.Lock()
			if err != nil {
				errors[key] = err
			} else {
				success[key] = true
			}
			mu.Unlock()
		}(key, url)
	}

	wg.Wait()
	return success, errors
}

func downloadImage(url, dir, filename string) error {
	// 创建HTTP客户端
	client := &http.Client{
		Timeout: 30 * time.Second,
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
		},
	}

	// 创建请求
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return fmt.Errorf("创建请求失败: %v", err)
	}

	// 设置请求头（模拟浏览器）
	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36")
	req.Header.Set("Accept", "image/webp,image/apng,image/*,*/*;q=0.8")
	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8")
	req.Header.Set("Referer", "https://hd4k.com/")

	// 发送请求
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("请求失败: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("HTTP错误: %s", resp.Status)
	}

	// 获取文件扩展名
	ext := getFileExtension(url)
	fullFilename := filename + ext
	filePath := filepath.Join(dir, fullFilename)

	// 创建文件
	file, err := os.Create(filePath)
	if err != nil {
		return fmt.Errorf("创建文件失败: %v", err)
	}
	defer file.Close()

	// 下载并保存
	_, err = io.Copy(file, resp.Body)
	if err != nil {
		// 删除可能已损坏的文件
		os.Remove(filePath)
		return fmt.Errorf("保存文件失败: %v", err)
	}

	return nil
}

func main() {
	flag.Parse()

	// 创建下载目录
	if err := os.MkdirAll(*downloadDir, 0755); err != nil {
		log.Fatal("创建下载目录失败:", err)
	}

	// 设置路由
	http.HandleFunc("/api/save_imgs", enableCORS(saveImagesHandler))
	http.HandleFunc("/api/reload_folders", enableCORS(reloadFoldersHandler))
	http.HandleFunc("/api/download_missing", enableCORS(downloadMissingHandler))
	http.HandleFunc("/api/cleanup_json", enableCORS(cleanupJsonHandler))

	// 静态文件服务
	http.Handle("/", http.FileServer(http.Dir(".")))

	fmt.Printf("HD4K下载服务启动\n")
	fmt.Printf("下载目录: %s\n", *downloadDir)
	fmt.Printf("API地址: http://127.0.0.1:%s/api/save_imgs\n", *port)
	fmt.Printf("管理页面: http://127.0.0.1:%s/\n", *port)
	fmt.Printf("按 Ctrl+C 停止服务\n")

	log.Fatal(http.ListenAndServe(":"+*port, nil))
}

func enableCORS(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")

		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}

		next(w, r)
	}
}