package main

import (
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"mime/multipart"
	"net/http"
	"os"
	"path"
	"strings"

	"github.com/spf13/viper"
)

func main() {
	postFormDataWithMultipartFile()
}

func readDir(dirname string) ([]string, error) {
	infos, err := ioutil.ReadDir(dirname)
	if err != nil {
		fmt.Println("file read Error!")
		fmt.Printf("%s", err)
		return nil, err
	}

	// names := make([]string, len(infos))
	var names []string
	for _, info := range infos {
		fileType := path.Ext(info.Name())
		if len(fileType) != 0 {
			fileType = strings.ToLower(fileType)
			if fileType == ".pdf" {
				names = append(names, info.Name())
			}
		}

		// names[i] = info.Name()
	}

	return names, nil
}

func remove(file string) {
	err := os.Remove(file) //删除文件test.txt
	if err != nil {
		//如果删除失败则输出 file remove Error!
		fmt.Println("file remove Error!", err)
	} else {
		//如果删除成功则输出 file remove OK!
		fmt.Println("file remove OK!", file)
	}
}

func postFormDataWithMultipartFile() {
	fmt.Println("=======start=======")

	config := viper.New()
	// config.AddConfigPath("./config/")
	// config.SetConfigName("config")
	// config.SetConfigType("yaml")

	config.SetConfigFile("./config/config.yaml")
	config.ReadInConfig()

	postURL := config.GetString("postURL")
	pdfPath := config.GetString("pdfPath")
	// postURL := "http://localhost:8080/api/tpsUpload"
	fmt.Println("load yml postURL: ", postURL)
	fmt.Println("load yml pdfPath: ", pdfPath)

	fileNames, _ := readDir(pdfPath)
	fmt.Println(fileNames)

	defer func() {
		for _, val := range fileNames {
			remove(pdfPath + val)
		}
	}()

	client := http.Client{}
	bodyBuf := &bytes.Buffer{}
	bodyWrite := multipart.NewWriter(bodyBuf)
	for _, val := range fileNames {
		file, err := os.Open(pdfPath + val)
		if err != nil {
			fmt.Println("err1")
			fmt.Printf("%s", err)
		}
		defer file.Close()
		fileWrite, _ := bodyWrite.CreateFormFile("files", val)
		_, err = io.Copy(fileWrite, file)
		if err != nil {
			fmt.Println("err2")
			fmt.Printf("%s", err)
		}
	}
	bodyWrite.Close() //要关闭，会将w.w.boundary刷写到w.writer中

	// 创建请求
	req, err := http.NewRequest(http.MethodPost, postURL, bodyBuf)
	if err != nil {
		fmt.Println("err3")
		fmt.Printf("%s", err)
	}
	// 设置头
	contentType := bodyWrite.FormDataContentType()
	req.Header.Set("Content-Type", contentType)
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("err4")
		fmt.Printf("%s", err)
	}

	defer resp.Body.Close()
	// defer req.Body.Close()

	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println("err5")
		fmt.Printf("%s", err)
	}
	fmt.Println(string(b))

	// client.CloseIdleConnections()

	fmt.Println("=======end=======")
}