package handler

import (
	"encoding/json"
	"fmt"
	"html/template"
	"io"
	"mime"
	"strings"
	"time"

	"net/http"
	"os"
	"path/filepath"

	"xtcfs/config"
	"xtcfs/util"

	"github.com/chyok/st/web"
)

// rpc功能 压缩包的结构体
// 文件路径 文件名
type Args struct {
	Zpfile, Fname string
}

// 获取文件大小的接口
type Size interface {
	Size() int64
}

// 获取文件信息的接口
type Stat interface {
	Stat() (os.FileInfo, error)
}

// 显示状态
func ReceiveStatus(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	// 显示当前传送文件的大小
	case http.MethodPost:
		file, _, err := r.FormFile("file")
		if err != nil {
			http.Error(w, err.Error(), 500)
			return
		}

		if statInterface, ok := file.(Stat); ok {
			fileInfo, _ := statInterface.Stat()
			fmt.Fprintf(w, "上传文件的大小为: %d", fileInfo.Size())
		}

		if sizeInterface, ok := file.(Size); ok {
			fmt.Fprintf(w, "上传文件的大小为: %d", sizeInterface.Size())
		}
		return
	}

	// fmt.Fprintf(w, r.Method)
}

// 接收 上传
func ReceiveHandler(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		// serve upload page for receive
		// tmpl, err := template.New("index").Parse(web.UploadPage)
		// if err != nil {
		// 	http.Error(w, err.Error(), http.StatusInternalServerError)
		// 	return
		// }
		// // 获取当前设备名称
		// err = tmpl.Execute(w, config.G.DeviceName)
		// if err != nil {
		// 	http.Error(w, err.Error(), http.StatusInternalServerError)
		// }
		//
		fmt.Fprintf(w, "%s:接收文件中...", r.Host)
	case http.MethodPost:
		// receive file and save
		file, header, err := r.FormFile("file")
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		defer file.Close()

		_, params, err := mime.ParseMediaType(header.Header.Get("Content-Disposition"))
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		filename := filepath.FromSlash(params["filename"])

		// fpath
		bfpath := r.Header.Get("Fpath")

		//debug
		fmt.Printf("header params:%v\n", r.Header)
		fmt.Printf("fpath is:%s,afbs64 is:%s\n", bfpath, util.Base64dec(bfpath))

		fmt.Printf("Downloading [%s]...\n", filename)
		// 拼装完整路径
		nfname := filepath.Join(config.G.FilePath, util.Base64dec(bfpath))
		dirPath := filepath.Dir(nfname)
		//dirPath := filepath.Dir(filename)
		err = os.MkdirAll(dirPath, os.ModePerm)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		// 检查文件是否存在
		if util.IsFileExist(nfname) {
			// 文件重命名
			ddname := filename + "_backup_" + time.Now().Format("20060102150405")
			// 加上路径
			fnewname := filepath.Join(dirPath, ddname)
			os.Rename(nfname, fnewname)
		}

		out, err := os.Create(nfname)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		defer out.Close()

		_, err = io.Copy(out, file)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		// 如果单文件，需要先备份

		// 如果收到的是zip文件，自动给解压缩
		suf := strings.Split(filename, ".")
		if suf[1] == "zip" {
			// 传入实际路径
			go util.DecompressZip(nfname)
		}

		fmt.Printf("[√] Download [%s] Success.\n", filename)
		//
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}

	// 输出接收结果
	// fmt.Fprintf(w, "接收成功，并已经完成解压缩")
}

// 文件服务
func FileServerHandler(w http.ResponseWriter, r *http.Request) {
	currentPath := config.G.FilePath

	fileInfo, err := os.Stat(currentPath)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	basePath := filepath.Base(currentPath)
	if fileInfo.IsDir() {
		path := r.URL.Path[len("/download/"+basePath):]
		fullPath := filepath.Join(currentPath, path)
		http.ServeFile(w, r, fullPath)
	} else {
		http.ServeFile(w, r, currentPath)
	}
}

// 发送拦截
func SendHandler(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		// serve download page for send
		realFilePath := filepath.Join(config.G.FilePath, r.URL.Path[1:])
		downloadPath := filepath.Join(filepath.Base(config.G.FilePath), r.URL.Path[1:])
		fileInfo, err := os.Stat(realFilePath)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		data := struct {
			DeviceName   string
			IsDir        bool
			FileName     string
			DownloadPath string
			UrlPath      string
			Files        []os.DirEntry
		}{
			DeviceName:   config.G.DeviceName,
			DownloadPath: downloadPath,
			UrlPath:      strings.TrimSuffix(r.URL.Path, "/"),
		}

		if fileInfo.IsDir() {
			data.IsDir = true
			// 遍历目录
			files, err := os.ReadDir(realFilePath)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
			data.Files = files
		} else {
			data.FileName = filepath.Base(realFilePath)
		}

		// 文件列表模板
		tmpl, err := template.New("download").Parse(web.DownloadPage)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		err = tmpl.Execute(w, data)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	case http.MethodPost:
		// return file or folder information in JSON format for convenient send to the recipient
		currentPath := config.G.FilePath
		fileInfo, err := os.Stat(currentPath)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		var pathInfo struct {
			Type  string   `json:"type"`
			Paths []string `json:"paths"`
		}

		if fileInfo.IsDir() {
			files, err := util.GetDirFilePaths(currentPath, true)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
			pathInfo.Paths = files
			pathInfo.Type = "dir"
		} else {
			pathInfo.Paths = []string{filepath.Base(currentPath)}
			pathInfo.Type = "file"
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(pathInfo)
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}