"use strict";

class MapsUtil {
	static _IMAGE_TYPES = new Set(["map", "mapPlayer"]);

	static getImageData ({prop, head, body}) {
		if (!head || !body) throw new Error(`Both a "head" and a "body" must be specified!`);

		const walker = MiscUtil.getWalker({keyBlocklist: MiscUtil.GENERIC_WALKER_ENTRIES_KEY_BLOCKLIST, isNoModification: true});

		const out = [];

		const len = Math.min(head.contents.length, body.length);
		for (let i = 0; i < len; ++i) {
			const contentsItem = head.contents[i];
			const chapter = body[i];

			const outChapter = {
				name: `${Parser.bookOrdinalToAbv(contentsItem.ordinal)}${contentsItem.name}`,
				ix: i,
				images: [],
			};

			walker.walk(
				chapter,
				{
					object: (obj) => {
						if (
							obj.type !== "image"
							|| !this._IMAGE_TYPES.has(obj.imageType)
						) return obj;

						if (obj.mapRegions) {
							const page = prop === "adventure" ? UrlUtil.PG_ADVENTURE : UrlUtil.PG_BOOK;
							obj = MiscUtil.copyFast(obj);
							obj.page = page;
							obj.source = head.source;
							obj.hash = UrlUtil.URL_TO_HASH_BUILDER[page](head);
						}

						outChapter.images.push(obj);
					},
				},
			);

			if (outChapter.images.length) out.push(outChapter);
		}

		return out.length
			? {
				[head.id]: {
					id: head.id,
					source: head.source,
					prop,
					parentSource: head.parentSource,
					chapters: out,
				},
			}
			: null;
	}
}

globalThis.MapsUtil = MapsUtil;