package qr

import (
	"archive/zip"
	"bytes"
	"encoding/base64"
	"fmt"
	"image"
	"image/draw"
	"image/jpeg"
	"image/png"
	"io"
	"net/http"
	"os"
	"path/filepath"

	"github.com/gin-gonic/gin"
	"github.com/nfnt/resize"
	"github.com/skip2/go-qrcode"
)

func CreateQr(content string, logoUrl string) (qr string, err error) {
	emptyBuff, err := CreateQrBase(content, logoUrl)

	if err != nil {
		return "", err
	}

	return string(emptyBuff.Bytes()), nil
}

func CreateQrBase64(content string, logoUrl string) (qr string, err error) {

	emptyBuff, err := CreateQrBase(content, logoUrl)
	if err != nil {
		return "", err
	}

	//return string(emptyBuff.Bytes()), nil
	return "data:image/png;base64," + base64.StdEncoding.EncodeToString(emptyBuff.Bytes()), nil
}

func CreateQrBase(content string, logoUrl string) (emptyBuff *bytes.Buffer, err error) {
	emptyBuff = bytes.NewBuffer(nil) //开辟一个新的空buff

	qrC, err := qrcode.New(content, qrcode.Low)
	img := qrC.Image(460)

	if err != nil {
		return
	}

	total := image.NewRGBA(img.Bounds()) //设置背景
	draw.Draw(total, total.Bounds(), img, img.Bounds().Min, draw.Over)

	if logoUrl != "" { //是否有logo
		v, err := http.Get(logoUrl)
		if err != nil {
			fmt.Printf("Http get [%v] failed! %v", logoUrl, err)
			return emptyBuff, err
		}
		defer v.Body.Close()

		icoImg2, _ := png.Decode(v.Body)

		icoImg := resize.Resize(54, 52, icoImg2, resize.Lanczos3)

		icoImgPnt := image.Point{(total.Bounds().Size().X - icoImg.Bounds().Size().X) / -2, (total.Bounds().Size().Y - icoImg.Bounds().Size().Y) / -2}
		draw.DrawMask(total, total.Bounds(), icoImg, icoImgPnt, nil, image.Point{}, draw.Src)
	}

	err = jpeg.Encode(emptyBuff, total, nil)
	if err != nil {
		return emptyBuff, err
	}
	return emptyBuff, nil
}

func ImagesOnZip(c *gin.Context, tempDir string) {
	// 创建ZIP文件并添加下载的图片
	zipFilename := "./collection.zip"
	zipFile, err := os.Create(zipFilename)
	if err != nil {
		c.String(http.StatusInternalServerError, fmt.Sprintf("Failed to create ZIP file: %v", err))
		return
	}
	defer zipFile.Close()

	zipWriter := zip.NewWriter(zipFile)
	defer zipWriter.Close()

	err = filepath.Walk(tempDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if info.IsDir() {
			return nil
		}
		relPath, err := filepath.Rel(tempDir, path)
		if err != nil {
			return err
		}
		file, err := os.Open(path)
		if err != nil {
			return err
		}
		defer file.Close()
		zipEntry, err := zipWriter.Create(relPath)
		if err != nil {
			return err
		}
		_, err = io.Copy(zipEntry, file)
		if err != nil {
			return err
		}
		return nil
	})
	if err != nil {
		c.String(http.StatusInternalServerError, fmt.Sprintf("Failed to create ZIP file: %v", err))
		return
	}
	if err := zipWriter.Close(); err != nil {
		fmt.Println("Close error: ", err)
	}
	// 设置响应头，将ZIP文件作为文件流传输给前端
	c.Header("Content-Type", "application/octet-stream")
	c.Header("Content-Disposition", "attachment; filename="+filepath.Base(zipFilename))
	c.Header("Content-Transfer-Encoding", "binary")
	c.Header("Cache-Control", "no-cache")
	c.File(zipFilename)
}