import {IPage, ISearchItem, ISearchParams, ISearchProvider, Order, Sort, StationId} from "../type";
import {beginToPage, wrappedFetch} from "../lib";
import {HTMLElement, parse} from "node-html-parser";

export class Provider5Melonbooks implements ISearchProvider {
	readonly stationId = StationId.Melonbooks;

	async search(params: ISearchParams): Promise<IPage> {
		const {keyword, begin = 1, maxNum = 100, minPrice, maxPrice, sort, order, category, shipping} = params;

		const pageNum = beginToPage(begin, maxNum);

		const url = new URL("https://www.melonbooks.co.jp/search/search.php?mode=search");
		url.searchParams.set("mode", 'search');
		url.searchParams.set("name", keyword);
		url.searchParams.set("pageno", String(pageNum));
		url.searchParams.set("disp_number", String(maxNum));
		const warn: string[] = [];
		if (category) {
			warn.push(`unsupported category=${category}`)
		}
		if (minPrice) {
			url.searchParams.set("price_low", String(minPrice));
		}
		if (maxPrice) {
			url.searchParams.set("price_high", String(maxPrice));
		}
		if (shipping === 'free') {
			warn.push(`unsupported shipping`);
		}
		if (sort) {
			if (sort === Sort.Latest) {
				if (order === Order.Asc) {
					url.searchParams.set("orderby", 'publish_asc');
				} else {
					url.searchParams.set("orderby", 'publish_desc');
				}
			} else if (sort ===Sort.Price) {
				if (order === Order.Desc) {
					url.searchParams.set("orderby", 'price_desc');
				} else {
					url.searchParams.set("orderby", 'price_asc');
				}
			} else if(sort!==Sort.Default) {
				warn.push(`unsupported sort=${sort}`);
			}
		}

		const resp = await wrappedFetch(url);

		if (!resp.ok) {
			if (resp.status === 404) {
				return {...params, dataList: [], error: '404 Not Found'};
			}
			return {...params, dataList: [], error: `HTTP error! status: ${resp.status}`};
		}

		// noinspection TypeScriptUnresolvedReference
		const html: any = await resp.text();

		const result = parseProducts(html);

		return {
			srcUrl: url.toString(),
			warning: warn.join(', '),
			begin,
			maxNum,
			pageNum,
			...params,
			...result,
		};
	}
}

function parseProducts(html: string): Omit<IPage, keyof ISearchParams> {
	const map = new Map<string, ISearchItem>();
	const doc = parse(html);
	doc.querySelectorAll('.search-page .item-list li[class^="product_"]')
		.map(parseItem)
		.forEach(item => item.itemId && map.set(item.itemId, item));

	const totalText = doc.querySelector('.search-page .search-meta .search-val')?.textContent;
	const total = totalText ? parseInt(totalText.replace(/\D+/g, '')) : 0;

	return {
		total: Math.max(total || 0, map.size),
		dataList: Array.from(map.values())
	};
}

function parseItem(el: HTMLElement): ISearchItem {
	const priceText = el.querySelector('.item-meta .item-price')?.textContent?.replace(/\D+/g, '');
	return {
		itemId: el.classNames?.replace(/\D+/g, ''),
		url: el.querySelector('.item-image a')?.getAttribute('href'),
		image: {
			imageUrl: el.querySelector('.item-image .item-thumbnail img')?.getAttribute('src'),
			alt: el.querySelector('.item-image .item-thumbnail img')?.getAttribute('alt'),
		},
		name: el.querySelector('.item-meta .product_title')?.textContent?.trim(),
		price: priceText ? parseInt(priceText) : undefined,
	};
}