package main

import (
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"hnyfkj.com.cn/rtu/linux/baseapp"
)

const maxUploadSize = 1 << 30 // 1GB

func uploadUserAPP(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	r.Body = http.MaxBytesReader(w, r.Body, maxUploadSize)

	err := r.ParseMultipartForm(maxUploadSize)
	if err != nil {
		http.Error(w, "解析上传文件失败: "+err.Error(), http.StatusBadRequest)
		return
	}

	file, header, err := r.FormFile("file")
	if err != nil {
		http.Error(w, "获取上传文件失败: "+err.Error(), http.StatusBadRequest)
		return
	}
	defer file.Close()

	if !strings.HasSuffix(strings.ToLower(header.Filename), ".tar.gz") {
		http.Error(w, "只允许上传 tar.gz 类型的文件", http.StatusBadRequest)
		return
	}

	path := filepath.Join("/tmp", filepath.Base(header.Filename))

	err = saveUploadFile(file, path)
	if err != nil {
		http.Error(w, "保存上传文件失败: "+err.Error(), http.StatusInternalServerError)
		return
	}

	baseapp.Logger.Infof(
		"[上传文件成功] 上传文件名: %s, 上传文件大小: %d 字节, 本地存储路径: %s",
		header.Filename, header.Size, path)

	w.WriteHeader(http.StatusOK)
}

func saveUploadFile(src io.Reader, path string) error {
	dst, err := os.Create(path)
	if err != nil {
		return err
	}
	defer dst.Close()

	_, err = io.Copy(dst, src)
	if err != nil {
		os.Remove(path)
		return err
	}

	return nil
}