package ui

import (
	"fmt"
	"image"
	"os"
	"sync"

	"github.com/aditya-K2/tview"
	"github.com/aditya-K2/utils"
	"github.com/gdamore/tcell/v2"
	"github.com/nfnt/resize"
	"gitlab.com/diamondburned/ueberzug-go"
)

var (
	cm sync.Mutex
)

type CoverArt struct {
	*tview.Box
	image *ueberzug.Image
}

func newCoverArt() *CoverArt {
	return &CoverArt{
		tview.NewBox().SetBorder(true).SetBackgroundColor(tcell.ColorDefault),
		nil,
	}
}

/* Gets the Image Struct from the provided path */
func getImg(uri string) (image.Image, error) {
	f, err := os.Open(uri)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	img, _, err := image.Decode(f)
	if err != nil {
		return nil, err
	}
	fw, fh, err := getFontWidth()
	if err != nil {
		return nil, err
	}
	img = resize.Resize(
		uint((ImgW*fw)+cfg.ImageWidthExtraX),
		uint((ImgH*fh)+cfg.ImageWidthExtraY),
		img,
		resize.Bilinear,
	)
	return img, nil
}

func (c *CoverArt) RefreshState() {
	cm.Lock()
	if c.image != nil {
		c.image.Clear()
	}
	fw, fh, err := getFontWidth()
	if err != nil {
		SendNotification(err.Error())
		return
	}
	if state != nil && state.Item != nil &&
		len(state.Item.Album.Images) > 0 {

		file := fileName(state.Item.Album)

		// Download Image if doesn't Exits
		if !utils.FileExists(file) {
			msg := SendNotificationWithChan("Downloading Cover Art...")
			f, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY, 0644)
			defer f.Close()
			if err != nil {
				go func() {
					msg <- fmt.Sprintf("Following error occured while creating file: %s", err.Error())
				}()
				return
			}
			err = state.Item.Album.Images[0].Download(f)
			if err != nil {
				go func() {
					msg <- fmt.Sprintf("Following error occured while downloading the image: %s", err.Error())
				}()
				return
			}
			go func() {
				msg <- "Image downloaded succesfully!"
			}()
		}

		// Open the Image
		uimg, err := getImg(file)
		if err != nil {
			SendNotification("Error Rendering Image: %s", err.Error())
			return
		}
		im, err := ueberzug.NewImage(uimg,
			int(ImgX*fw)+cfg.AdditionalPaddingX,
			int(ImgY*fh)+cfg.AdditionalPaddingY)
		if err != nil {
			SendNotification("Error Rendering Image: %s", err.Error())
			return
		}
		c.image = im

	}
	cm.Unlock()
}