/**
 * Where the imaging specs are pointed.
 *
 * - Deploy gate (`playwright.config.ts`): hits the CMS directly, so the CMS's
 *   own `/imaging` route answers and its transcoding variants are reachable.
 * - Cross-browser job (`playwright.imaging.config.ts` against the public
 *   origin): the edge proxy fronts bare `/imaging` (and `/imaging/*`) to the
 *   imager container, so the CMS route is shadowed. Only the endpoints that are
 *   identical in both topologies may be asserted unconditionally.
 *
 * Set `IMAGING_EDGE=1` when the base URL is behind the edge proxy.
 */
export const IS_EDGE = process.env.IMAGING_EDGE === "1";

// The exact figure that regressed in production: the game client appends a
// trailing `.<n>` segment that the renderer ignores, but the previous
// validation regex rejected with a 400.
export const FIGURE =
	"hr-11782-40-40.hd-180-7-14.ch-11592-66.lg-10726-79-1408.sh-11764-1408.ha-11958-70-1408.wa-2007-0.0";

export const avatarPath = (params: Record<string, string> = {}) =>
	`/api/imaging/avatar?${new URLSearchParams({ figure: FIGURE, ...params })}`;

/** Public imager endpoint served through the edge proxy (imager container). */
export const IMAGER_PATH = (params: Record<string, string> = {}) =>
	`/imaging/avatarimage?${new URLSearchParams({ figure: FIGURE, ...params })}`;

/** Counts non-overlapping occurrences of `needle` inside `haystack`. */
export function countBytes(haystack: Buffer, needle: Buffer): number {
	let count = 0;
	for (
		let index = haystack.indexOf(needle);
		index !== -1;
		index = haystack.indexOf(needle, index + needle.length)
	) {
		count += 1;
	}
	return count;
}

/** PNG/JPEG/GIF/WebP/AVIF signatures, so a test can prove a body is an image. */
export function looksLikeImage(body: Buffer): boolean {
	if (body.length < 12) return false;
	if (body.subarray(0, 8).equals(Buffer.from("89504e470d0a1a0a", "hex")))
		return true; // PNG / APNG
	if (body.subarray(0, 3).toString("ascii") === "GIF") return true;
	if (body.subarray(0, 2).toString("hex") === "ffd8") return true; // JPEG
	if (body.subarray(0, 4).toString("ascii") === "RIFF") return true; // WebP
	if (body.subarray(4, 12).toString("ascii") === "ftypavif") return true; // AVIF
	return false;
}