package utils

import (
	"archive/zip"
	"fmt"
	"io"
	"time"

	"gitlab.com/gfxlabs/gfximg/apng"
)

func ZipApngs(w io.Writer, xs []*apng.APNG) error {
	zw := zip.NewWriter(w)
	defer zw.Close()
	for i, v := range xs {
		header := zip.FileHeader{
			Name:     fmt.Sprintf("./animations/a_%d.png", i),
			NonUTF8:  false,
			Method:   zip.Deflate,
			Modified: time.Now(),
		}
		hw, err := zw.CreateHeader(&header)
		if err != nil {
			return err
		}
		err = apng.Encode(hw, *v)
		if err != nil {
			return err
		}
	}
	return nil
}