package gif

import (
	"os"
	"strconv"
	"sync"

	"github.com/FloatTech/floatbox/file"
	"github.com/FloatTech/floatbox/web"
	"github.com/FloatTech/imgfactory"
	"github.com/sirupsen/logrus"
)

type context struct {
	usrdir      string
	headimgsdir []string
}

func dlchan(name string, s *string, wg *sync.WaitGroup, exit func(error)) {
	defer wg.Done()
	target := datapath + `materials/` + name
	if file.IsNotExist(target) {
		data, err := web.GetData(`https://gitea.seku.su/fumiama/ImageMaterials/raw/branch/main/` + name)
		if err != nil {
			_ = os.Remove(target)
			exit(err)
			return
		}
		f, err := os.Create(target)
		if err != nil {
			exit(err)
			return
		}
		_, err = f.Write(data)
		_ = f.Close()
		if err != nil {
			_ = os.Remove(target)
			exit(err)
			return
		}
		logrus.Debugln("[gif] dl", name, "to", target, "succeeded")
	} else {
		logrus.Debugln("[gif] dl", name, "exists at", target)
	}
	*s = target
}

func dlblock(name string) (string, error) {
	target := datapath + `materials/` + name
	if file.IsNotExist(target) {
		data, err := web.GetData(`https://gitea.seku.su/fumiama/ImageMaterials/raw/branch/main/` + name)
		if err != nil {
			_ = os.Remove(target)
			return "", err
		}
		f, err := os.Create(target)
		if err != nil {
			return "", err
		}
		_, err = f.Write(data)
		_ = f.Close()
		if err != nil {
			_ = os.Remove(target)
			return "", err
		}
		logrus.Debugln("[gif] dl", name, "to", target, "succeeded")
	} else {
		logrus.Debugln("[gif] dl", name, "exists at", target)
	}
	return target, nil
}

func dlrange(prefix string, end int, wg *sync.WaitGroup, exit func(error)) []string {
	if file.IsNotExist(datapath + `materials/` + prefix) {
		err := os.MkdirAll(datapath+`materials/`+prefix, 0755)
		if err != nil {
			exit(err)
			return nil
		}
	}
	c := make([]string, end)
	for i := range c {
		wg.Add(1)
		go dlchan(prefix+"/"+strconv.Itoa(i)+".png", &c[i], wg, exit)
	}
	return c
}

// 新的上下文
func newContext(user int64, atUser int64) *context {
	c := new(context)
	c.usrdir = datapath + "users/" + strconv.FormatInt(atUser, 10) + `/`
	_ = os.MkdirAll(c.usrdir, 0755)
	c.headimgsdir = make([]string, 2)
	c.headimgsdir[0] = datapath + "users/" + strconv.FormatInt(atUser, 10) + ".gif"
	c.headimgsdir[1] = datapath + "users/" + strconv.FormatInt(user, 10) + ".gif"
	return c
}

func loadFirstFrames(paths []string, size int) (imgs []*imgfactory.Factory, err error) {
	imgs = make([]*imgfactory.Factory, size)
	for i := range imgs {
		imgs[i], err = imgfactory.LoadFirstFrame(paths[i], 0, 0)
		if err != nil {
			return nil, err
		}
	}
	return imgs, nil
}