package Minio

import (
	"dsSupport/Utils/CommonUtil"
	"dsSupport/Utils/ConfigUtil"
	"dsSupport/Utils/FileUtil"
	"dsSupport/Utils/ImageUtil"
	"github.com/gin-gonic/gin"
	"github.com/minio/minio-go/v6"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"strings"
	"time"
)

//  多集群实验(minio 集群搭建)
//  https://www.cnblogs.com/rongfengliang/p/9197315.html
//  TODO
//  多台机器，多块硬盘的实验
//  模拟损坏一块硬盘，模拟损坏一台(N台）机器

//模块的路由配置
func Routers(r *gin.RouterGroup) {
	//注册接口路径
	rr := r.Group("/minio")
	//上传URL签名
	rr.GET("/presignedUrl", presignedUrl)
	//获取下载URL地址
	rr.GET("/getUrl", getUrl)
	//显示缩略图
	rr.GET("/scale", scale)
	return
}

//声明s3的客户端实例
var s3Client *minio.Client
var err error
var bucketName string

//初始化
func init() {
	bucketName = ConfigUtil.MinioBacketName
	s3Client, err = minio.New(ConfigUtil.MinioEndpoint, ConfigUtil.MinioAk, ConfigUtil.MinioSk, false)
	if err != nil {
		log.Fatalln(err)
	}
}

/**
功能：在minio上支持图片的缩放
作者：黄海
时间: 2020-07-16
用例: http://10.10.24.100:9000/dsSupport/minio/scale?key=IMG_20200512_114233.jpg&w=800&h=600
*/
func scale(c *gin.Context) {
	//minio中的图片地址
	key := c.Query("key")
	//宽
	w := c.Query("w")
	//高
	h := c.Query("h")

	//Content_Type
	_extMap := make(map[string]string, 0)
	_extMap["png"] = "image/png"
	_extMap["jpg"] = "image/jpeg"
	_extMap["jpeg"] = "image/jpeg"
	_extMap["bmp"] = "image/bmp"

	//TODO
	//w和h的整数范围检查
	//在minio中是不是已经存在目标文件，如果存在，就不用再费劲了~

	//(1)下载回来
	url := "http://" + ConfigUtil.MinioEndpoint + "/" + ConfigUtil.MinioBacketName + "/" + key
	res, err := http.Get(url)
	if err != nil {
		c.String(http.StatusOK, "文件在minio中没有找到！")
		return
	}
	src := CommonUtil.GetCurrentPath() + "/TempFiles/" + key
	if FileUtil.Exists(src) {
		os.Remove(src)
	}
	f, err := os.Create(src)
	if err != nil {
		c.String(http.StatusOK, "在本地创建缓存文件失败！")
		return
	}
	io.Copy(f, res.Body)
	//(2)生成缩略图
	//打开源文件
	fIn, _ := os.Open(src)
	defer fIn.Close()
	//创建目标文件
	dst := strings.Replace(src, ".", "_"+w+"_"+h+".", 1)
	fOut, _ := os.Create(dst)
	defer fOut.Close()
	//缩放
	err = ImageUtil.Scale(fIn, fOut, CommonUtil.ConvertStringToInt(w), CommonUtil.ConvertStringToInt(h), 100)
	if err != nil {
		c.String(http.StatusOK, "生成缩略图失败！")
		return
	}
	//(3)上传回去
	file, _ := os.Open(dst)
	defer file.Close()
	fileStat, _ := file.Stat()
	dkey := strings.Replace(key, ".", "_"+w+"_"+h+".", 1)

	//需要配置一下图片的header头
	extArr := strings.Split(dkey, ".")
	ext := extArr[1]
	if _, ok := _extMap[ext]; !ok {
		//不存在
		c.String(http.StatusInternalServerError, "不支持的扩展名！")
		return
	}
	_, err = s3Client.PutObject(ConfigUtil.MinioBacketName, dkey, file, fileStat.Size(),
		minio.PutObjectOptions{ContentType: _extMap[ext]})
	if err != nil {
		c.String(http.StatusInternalServerError, "上传Minio失败！")
		return
	}
	//(4)返回结果路径
	c.String(http.StatusOK, "http://"+ConfigUtil.MinioEndpoint+"/"+ConfigUtil.MinioBacketName+"/"+dkey)
	return
}

/**
功能：获取下载URL地址
作者：黄海
时间：2020-07-16
http://127.0.0.1:9000/dsSupport/minio/getUrl?name=62922248-63CD-4AA5-AD5C-1AA44ADAC603.mov
*/
func getUrl(c *gin.Context) {
	name := c.Query("name")
	reqParams := make(url.Values)
	reqParams.Set("response-content-disposition", "attachment; filename=\""+name+"\"")
	presignedURL, err := s3Client.PresignedGetObject(bucketName, name, time.Duration(1000)*time.Second*60, reqParams)
	if err != nil {
		log.Fatalln(err)
	}
	c.String(http.StatusOK, presignedURL.String())
}

/**
功能：生成上传的签名
作者：黄海
时间：2020-07-16
*/
func presignedUrl(c *gin.Context) {
	//换成uuid文件格式
	name := c.Query("name")
	ext := strings.Split(name, ".")[1]
	name = CommonUtil.GetUUID() + "." + ext
	presignedURL, err := s3Client.PresignedPutObject(bucketName, name, time.Duration(1000)*time.Second*300)
	if err != nil {
		c.String(http.StatusInternalServerError, "发生了严重错误！")
		return
	}
	c.String(http.StatusOK, presignedURL.String())
}