'use strict';

const createEventEmitter = require("create-event-emitter");
const defaultValue = require("default-value");

function ifNotEmpty(value) {
	if (value !== "") {
		return value;
	}
}

module.exports = function createScraper(options = {}) {
	let scraperSettings = defaultValue(options.scraperSettings, {});

	const pasteStore = require("./paste-store")();
	const pastebinComScraper = require("./scrapers/pastebin-com")(scraperSettings.pastebinCom);
	const errors = require("./errors");

	let scraper = createEventEmitter({
		pasteStore: pasteStore
	});

	pastebinComScraper.on("paste", (paste) => {
		let postedDate = parseInt(paste.date);
		let expiryDate = parseInt(paste.expire);

		pasteStore.add({
			site: "pastebinCom",
			url: paste.full_url,
			date: postedDate,
			id: paste.key,
			expire: (expiryDate !== 0) ? (expiryDate - postedDate) : undefined,
			username: ifNotEmpty(paste.user),
			language: paste.syntax,
			title: ifNotEmpty(paste.title),
			contents: paste.raw
		});
	});

	pastebinComScraper.on("error", (error) => {
		if (error instanceof errors.HttpError && error.rateLimited !== true) {
			scraper.emit("warning", error);
		} else {
			scraper.emit("error", error);
		}
	});

	if (options.scrapePastebinCom) {
		pastebinComScraper.start();
	}

	pasteStore.on("added", (paste) => {
		scraper.emit("newPaste", paste);
	});

	return scraper;
};