package aluminum

import "os"
import "fs"
import "fmt"
import "image"
import "image/png"
import "git.tebibyte.media/tomo/tomo/data"
import "git.tebibyte.media/tomo/tomo/theme"
import "git.tebibyte.media/tomo/tomo/input"
import "git.tebibyte.media/tomo/tomo/canvas"

type iconSet struct {
	fs fs.FS
	icons: map[theme.IconSize] map[string] canvas.Texture
}

func (this *iconSet) get (size theme.IconSize, name string) canvas.Texture {
	texture := this.icons[size][name]
	if texture != nil {
		return texture
	} else {
		texture = nil
		defer func () { this.icons[size][name] = texture } ()

		file, err := this.fs.Open(fmt.Sprint(size, "/", name, ".png"))
		if err != nil { return nil }
		defer file.Close()
		image, _, err := image.Decode(file)
		if err != nil { return nil }
		texture = tomo.NewTexture(image)
	}
}

func (this *iconSet) Icon (id theme.Icon, size theme.IconSize) canvas.Texture {
	return this.get(size, fmt.Sprint("actions/", id))
}

func (this *iconSet) MimeIcon (mime data.Mime, size theme.IconSize) canvas.Texture {
	texture := this.get(size, fmt.Sprint("mime/", mime))
	if texture != nil {
		return texture
	} else {
		return this.get(size, fmt.Sprint("mime-generic/", mime.Type))
	}
}

func (this *iconSet) ApplicationIcon (id theme.ApplicationIcon, size theme.IconSize) canvas.Texture {
	texture := this.get(size, fmt.Sprint("app/", id.Name))
	if texture != nil {
		return texture
	} else {
		return this.get(size, fmt.Sprint("app-generic/", app.Role))
	}
}