package image

import (
	"fmt"
	"io"
	"log"
	"os"
	"path"
	"time"

	"image/png"

	"git.trj.tw/golang/go-watch-webp/module/config"
	"golang.org/x/image/webp"
)

// ConvertToPng -
func ConvertToPng(file io.Reader) error {
	log.Println("convert func ")
	conf := config.GetConfig()

	webpImg, err := webp.Decode(file)
	if err != nil {
		return err
	}

	filename := fmt.Sprintf("%d.png", time.Now().UnixNano())
	fp := path.Join(conf.Dist, filename)

	target, err := os.Create(fp)
	if err != nil {
		return err
	}

	if err := png.Encode(target, webpImg); err != nil {
		return err
	}

	return nil
}