package main

import (
	"bufio"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"os"
	"path"
	"strings"
	"time"

	. "github.com/linxGnu/goseaweedfs"
)

// 判断文件夹是否存在
func PathExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func CreatePath(path string) (bool, error) {
	exist, err := PathExists(path)
	if err != nil {
		return false, err
	}

	if exist {
		return true, nil
	} else {
		// 创建文件夹
		err := os.Mkdir(path, os.ModePerm)
		if err != nil {
			return false, err
		} else {
			return true, err
		}
	}
}

func DownloadFile(durl string, destFileName string, filePath string) {
	uri, err := url.ParseRequestURI(durl)
	if err != nil {
		panic("网址错误")
	}

	var filename string
	if destFileName == "" {
		filename = path.Base(uri.Path)
	} else {
		filename = filePath + "/" + destFileName
		CreatePath(filePath)
	}
	log.Println("[*] Filename " + filename)

	client := http.DefaultClient
	client.Timeout = time.Second * 60 //设置超时时间
	resp, err := client.Get(durl)
	if err != nil {
		log.Println("[*] download error:", err)
		panic(err)
	}
	if resp.ContentLength <= 0 {
		log.Println("[*] Destination server does not support breakpoint download.")
	}
	raw := resp.Body
	defer raw.Close()

	file, err := os.Create(filename)
	defer file.Close()
	writer := bufio.NewWriter(file)
	defer writer.Flush()
	body, err := ioutil.ReadAll(raw)
	writer.Write(body)
	if err != nil {
		panic(err)
	}
}

func uploadFile(DocFilePath string, fileUpServer string, fileDownServer string) (string, error) {
	//6. 上传文件到文件服务器
	//DocFilePath := utils.Cfg.MustValue("file", "docDir") + entrustId + "/" + tmpDocName
	var sw *Seaweed
	var filer []string
	if _filer := os.Getenv("GOSWFS_FILER_URL"); _filer != "" {
		filer = []string{_filer}
	}
	sw = NewSeaweed("http", fileUpServer, filer, 2*1024*1024, 5*time.Minute)
	_, _, fID, err := sw.UploadFile(DocFilePath, "", "")
	log.Println("FID = ", fID)
	log.Println("err = ", err)
	retDocUrl := fileDownServer + "/" + fID
	//6.1 删除本地文件，释放空间
	os.Remove(DocFilePath)

	//7. 保存住报告URL(由controller层调用生成或修改生成报告记录)
	return retDocUrl, err
}

//参数字符串拆分
func getParams(params string) map[string]string {
	m := make(map[string]string)
	params = strings.Replace(params, "petrotool://", "", -1)
	params = strings.Replace(params, "/", "", -1)
	paramAry := strings.Split(params, "&")
	for _, v := range paramAry {
		kv := strings.Split(v, "=")
		m[kv[0]] = kv[1]
	}
	return m
}

func Copy(src, dst string) (int64, error) {
	sourceFileStat, err := os.Stat(src)
	if err != nil {
		return 0, err
	}

	if !sourceFileStat.Mode().IsRegular() {
		return 0, fmt.Errorf("%s is not a regular file", src)
	}

	source, err := os.Open(src)
	if err != nil {
		return 0, err
	}
	defer source.Close()

	if ret, _ := PathExists(dst); !ret {
		os.Remove(dst)
	}

	destination, err := os.Create(dst)
	if err != nil {
		return 0, err
	}

	defer destination.Close()
	nBytes, err := io.Copy(destination, source)
	return nBytes, err
}