// error debug
package file

import (
	"errors"
	"io"
	"io/ioutil"
	"net/http"
	"os"

	//"os/exec"
	"path"
	"path/filepath"

	//"runtime"
	"log"
	"strings"
)

/**
* 文件下载
* param url 要下载的文件URL
* param filename 文件保存路径（或文件保存名称）
 */
func DownloadFile(url, filename string) error {

	if url == "" {
		return errors.New("文件下载地址为空")
	}
	//判断filename是路径还是文件名
	fileIndex := strings.Index(filename, ".")

	var filePath string

	if fileIndex < 1 { //名称是路径
		index := strings.Index(url, "?")
		if index > 0 {
			url1 := url[0:index]
			index2 := strings.LastIndex(url1, "/")
			//修改此处index2为index2+1,不然多了一个多余的/
			fileName := url1[index2+1:]
			filePath = strings.TrimRight(filename, "/") + "/" + fileName
		} else {
			fileName := path.Base(url) //获取文件名带后缀
			filePath = strings.TrimRight(filename, "/") + "/" + fileName
		}
	} else {
		filePath = filename
	}

	res, err := http.Get(url)
	if err != nil {
		return err
	}

	dir, _ := filepath.Split(filePath)

	CreatePath(dir)

	file, err := os.Create(filePath)
	if err != nil {
		return err
	}

	_, copyerr := io.Copy(file, res.Body)
	if copyerr != nil {
		return err
	}
	return nil
}

/**
 * 获取远程接口信息
 */
func Geturl(url string) ([]byte, error) {

	resp, err := http.Get(url)
	if err != nil {
		return []byte(""), err
	}

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return []byte(""), err
	}
	return body, nil
}

/**
* 文件是否存在
 */
func FileExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

// Copy a file
func Cpfile(originalFilePath, newFilePath string) error {
	// Open original file
	originalFile, err := os.Open(originalFilePath)

	if err != nil {
		return err
	}

	defer originalFile.Close()

	// Create new file
	newFile, err := os.Create(newFilePath)

	if err != nil {
		return err
	}

	defer newFile.Close()

	// Copy the bytes to destination from source
	_, err = io.Copy(newFile, originalFile)

	if err != nil {
		return err
	}

	// Commit the file contents
	// Flushes memory to disk
	err = newFile.Sync()
	if err != nil {
		return err
	}
	return nil
}

func WriteFile(filePath, data string) error {

	fileExist, err := FileExists(filePath)
	if err != nil {
		return err
	}

	var f *os.File

	if fileExist { //如果文件存在
		f, err = os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644) //打开文件
	} else {
		f, err = os.Create(filePath) //创建文件
	}
	if err != nil {
		return err
	}

	_, err = io.WriteString(f, data) //写入文件(字符串)
	if err != nil {
		return err
	}
	return nil

}

/**
* read file
 */
func ReadFile(path string) string {
	fi, err := os.Open(path)
	if err != nil {
		return ""
	}
	defer fi.Close()
	fd, err := ioutil.ReadAll(fi)
	return string(fd)
}

/**
 *读取文件内容(返回字符串)
 */
func GetFileContent(FilePath string) string {

	buf, err := ioutil.ReadFile(FilePath)
	if err != nil {
		log.Println("ERROR", "read file error", FilePath, err)
		return ""
	}

	return string(buf)
}