import { ART_FILES } from './art-assets.ts'

export type ArtFileName = keyof typeof ART_FILES

const ART_PATHS = new Set(Object.keys(ART_FILES))

export function artFileName(pathname: string): ArtFileName | null {
	const name = pathname.replace(/^\//, '')
	return ART_PATHS.has(name) ? (name as ArtFileName) : null
}

export function decodeArtBase64(base64: string): Uint8Array {
	const binary = atob(base64)
	const bytes = new Uint8Array(binary.length)
	for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i)
	return bytes
}

export function artResponse(pathname: string): Response | null {
	const name = artFileName(pathname)
	if (!name) return null
	const file = ART_FILES[name]
	return new Response(decodeArtBase64(file.base64), {
		headers: {
			'Content-Type': file.type,
			'Cache-Control': 'public, max-age=604800',
		},
	})
}