"use strict";

const Promise = require("bluebird");
const dotty = require("dotty");
const cheerio = require("cheerio");
const url = require("url");
const chalk = require("chalk");

const config = require("./config.json");
const bhttp = require("bhttp").session({ headers: { "user-agent": `barcodebot (problems: ${config.email})` } });
const parseFoodbook = require("./parse-foodbook");

function log(barcode, message) {
	console.log(`${chalk.cyan(`[${barcode}]`)} ${message}`);
}

function mapCurrency(abbreviation) {
	if (abbreviation === "USD") {
		return "$";
	} else if (abbreviation === "EUR") {
		return "€";
	} else {
		throw new Error(`Unrecognized currency: ${abbreviation}`);
	}
}

function cleanValue(value) {
	if(value != null) {
		return value.replace(/\n/g, " ").replace(/\s+/, " ").trim();
	}
}

let barcodeGetters = [
	getBarcode_coop,
	getBarcode_bolCom,
	getBarcode_buycott,
	getBarcode_foodBook,
	getBarcode_eanData,
	getBarcode_openFoodFacts,
];

module.exports = function getBarcode(barcode) {
	return Promise.try(() => {
		return Promise.reduce(barcodeGetters, (lastResult, getter) => {
			if (lastResult == null) {
				return getter(barcode);
			} else {
				return lastResult;
			}
		}, null);
	}).then((result) => {
		if (result != null) {
			return {
				... result,
				image: (result.image !== "") ? result.image : null
			};
		} else {
			return null;
		}
	})
};

function getBarcode_eanData(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying EANData...");

		return bhttp.get(`https://eandata.com/feed/?v=3&keycode=${config.apiKeys.eanData}&mode=json&find=${barcode}`);
	}).then((response) => {
		if (response.statusCode === 200) {
			let productName = dotty.get(response.body, "product.attributes.product");

			if (productName != null) {

				let data = {
					name: cleanValue(productName),
					image: dotty.get(response.body, "product.image")
				};

				let priceCurrency = dotty.get(response.body, "product.attributes.price_new_extra");
				let priceAmount = dotty.get(response.body, "product.attributes.price_new");

				if (priceAmount != null) {
					data.price = `${mapCurrency(priceCurrency)} ${priceAmount}`;
				}

				return data;
			} else {
				return null;
			}
		} else {
			return null;
		}
	});
}

let coop404Regex = /We kunnen de pagina die je zoekt niet vinden/;

function getBarcode_coop(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying Coop...");

		return bhttp.get(`https://www.coop.nl/inventory/product/${barcode}`);
	}).then((response) => {
		if (response.statusCode === 200 && !coop404Regex.test(response.body.toString())) {
			let $ = cheerio.load(response.body);
			let $imageNoscript = cheerio.load($("picture noscript").html());

			return {
				name: cleanValue($(".detailHeader").text().trim().replace(/\n/g, " - ")),
				// image: $('meta[property="og:image"]').attr("content"),
				image: $imageNoscript('img').attr("src"),
				price: `€ ${$(".mainActions ins.price").text()}`
			};
		} else {
			return null;
		}
	});
}

function getBarcode_foodBook(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying FoodBook...");

		return bhttp.post(`https://foodbook.psinfoodservice.com/prod/dc`, {
			"SelectedFilterOptions.collapseFilterId": "filterkeywordPanelBody",
			"SelectedFilterOptions.FreeText": "",
			"SelectedFilterOptions.ProductGroupId": "",
			"SelectedFilterOptions.BrandId": "",
			"SelectedFilterOptions.GrossierId": "",
			"SelectedFilterOptions.Ean": barcode,
			"SelectedFilterOptions.ProducerNumber": "",
			"SelectedFilterOptions.GrossierNumber": "",
			"PS_brands_input": "",
			"PS_brands": ""
		});
	}).then((response) => {
		let products = parseFoodbook.parseSearch(response.body);

		if (products.length > 0) {
			return Promise.try(() => {
				let productUrl = url.resolve("https://foodbook.psinfoodservice.com/prod/dc", products[0]);

				return bhttp.get(productUrl);
			}).then((response) => {
				if (response.statusCode === 200) {
					return parseFoodbook.parseProduct(response.body);
				} else {
					return null;
				}
			});
		} else {
			return null;
		}
	});
}

function getBarcode_openFoodFacts(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying OpenFoodFacts...");

		return bhttp.get(`https://world.openfoodfacts.org/api/v0/product/${encodeURIComponent(barcode)}.json`);
	}).then((response) => {
		if (response.statusCode === 200 && response.body.status === 1 && response.body.product.product_name != null) {
			return {
				name: cleanValue(response.body.product.product_name),
				image: response.body.product.image_url
			};
		} else {
			return null;
		}
	});
}

function getBarcode_buycott(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying Buycott...");

		return bhttp.get(`https://www.buycott.com/upc/${encodeURIComponent(barcode)}`);
	}).then((response) => {
		if (response.statusCode === 200) {
			let $ = cheerio.load(response.body);

			let product = cleanValue($("#container_header h2").text());

			let tableData = $("table.product_info_table tr").get().map((row) => {
				let $row = $(row);

				return [
					cleanValue($row.find("td:nth-child(1)").text()),
					cleanValue($row.find("td:nth-child(2)").text()),
				];
			});

			let brandRow = tableData.find(([key, value]) => (key === "GS1 Name"));

			let productName;

			if (brandRow != null) {
				productName = `${brandRow[1]}, ${product}`;
			} else {
				productName = product;
			}

			return {
				name: productName,
				image: $(".header_image img").attr("src")
			};
		}
	});
}

function getBarcode_bolCom(barcode) {
	return Promise.try(() => {
		log(barcode, "Trying bol.com...");

		return bhttp.get(`https://www.bol.com/nl/s/algemeen/zoekresultaten/Ntt/${encodeURIComponent(barcode)}/N/0/Nty/1/search/true/searchType/qck/defaultSearchContext/media_all/sc/media_all/index.html`);
	}).then((response) => {
		if (response.statusCode === 200) {
			let $ = cheerio.load(response.body);

			let productName = cleanValue($(".pdp-header__title").text());

			if (productName.length > 0) {
				return {
					name: productName,
					image: $(".js_product_img").attr("src"),
					price: `€ ${cleanValue($(".promo-price").text())}`
				};
			}
		}
	});
}