package internal

import (
	"image/color"
	"strconv"
)

// the internally pre buffered (and scaled) image
var cachedImage []byte

// the internally pre buffered color palette
var cachedPalette []byte

// cache an image
func cacheImage(image []byte) {
	cachedImage = image
}

// cache a color palette
func cachePalette(colors []color.Color) {
	var palette string
	for index, color := range colors {
		if index > 0 {
			palette += "\n"
		}
		tmp := strconv.Itoa(index)
		if len(tmp) < 2 {
			tmp = "0" + tmp
		}
		tmp = "SLIDESHOW_COLOR" + tmp
		palette += tmp + "=\"" + rgbToHex(color) + "\""
	}
	cachedPalette = []byte(palette)
}

// check if an image is cached
func hasCachedImage() bool {
	return len(cachedImage) > 0
}

// check if a color palette is cached
func hasCachedColorPalette() bool {
	return len(cachedPalette) > 0
}