const cheerio = require('cheerio');
const Scraper = require('./se_scraper');

class BingScraper extends Scraper {

	parse(html) {
		// load the page source into cheerio
		const $ = cheerio.load(html);

		// perform queries
		const results = [];
		$('#b_content #b_results .b_algo').each((i, link) => {
			results.push({
				link: $(link).find('h2 a').attr('href'),
				title: $(link).find('h2').text(),
				snippet: $(link).find('.b_caption p').text(),
				visible_link: $(link).find('cite').text(),
			})
		});

		// 'Including results for', 'Einschließlich Ergebnisse'
		let no_results = this.no_results(
			['There are no results', 'Es gibt keine Ergebnisse'],
			$('#b_results').text()
		);

		let effective_query = $('#sp_requery a').first().text() || '';

		const cleaned = [];
		for (var i=0; i < results.length; i++) {
			let res = results[i];
			if (res.link && res.link.trim() && res.title && res.title.trim()) {
				res.rank = this.result_rank++;
				cleaned.push(res);
			}
		}

		return {
			time: (new Date()).toUTCString(),
			no_results: no_results,
			effective_query: effective_query,
			num_results: $('#b_content .sb_count').text(),
			results: cleaned,
		}
	}

	async load_start_page() {
		try {
			await this.page.goto('https://www.bing.com/');
		    await this.page.waitForSelector('input[name="q"]', { timeout: 5000 });
		} catch (e) {
		    return false;
		}
		return true;
	}

	async search_keyword(keyword) {
		const input = await this.page.$('input[name="q"]');
		await this.set_input_value(`input[name="q"]`, keyword);
		await this.sleep(50);
		await input.focus();
		await this.page.keyboard.press("Enter");
	}

	async next_page() {
		let next_page_link = await this.page.$('.sb_pagN', {timeout: 1000});
		if (!next_page_link) {
		    return false;
		}
		await next_page_link.click();
		await this.page.waitForNavigation();

		return true;
	}

	async wait_for_results() {
		await this.page.waitForSelector('#b_content', { timeout: 5000 });
		await this.sleep(500);
	}

	async detected() {
		// TODO: I was actually never detected by bing. those are good guys.
	}
}


class BingNewsScraper extends Scraper {

	parse(html) {
		// load the page source into cheerio
		const $ = cheerio.load(html);

		// perform queries
		const results = [];
		$('#algocore .newsitem').each((i, link) => {
			results.push({
				link: $(link).attr('url'),
				title: $(link).find('a.title').text(),
				snippet: $(link).find('.snippet').text(),
				date: $(link).find('.source span').last().text(),
			})
		});

		const cleaned = [];
		for (var i=0; i < results.length; i++) {
			let res = results[i];
			if (res.link && res.link.trim() && res.title && res.title.trim()) {
				res.rank = this.result_rank++;
				cleaned.push(res);
			}
		}

		return {
			time: (new Date()).toUTCString(),
			results: cleaned,
		}
	}

	async load_start_page() {
		try {
			await this.page.goto('https://www.bing.com/news/search?');
			if (this.config.set_manual_settings === true) {
				console.log('Sleeping 30 seconds. Set your settings now.');
				await this.sleep(30000);
			}
			await this.page.waitForSelector('input[name="q"]', { timeout: 5000 });
		} catch (e) {
			return false;
		}
		return true;
	}

	async search_keyword(keyword) {
		const input = await this.page.$('input[name="q"]');
		await this.set_input_value(`input[name="q"]`, keyword);
		await this.sleep(50);
		await input.focus();
		await this.page.keyboard.press("Enter");
	}

	async next_page() {
		let next_page_link = await this.page.$('.sb_pagN', {timeout: 1000});
		if (!next_page_link) {
			return false;
		}
		await next_page_link.click();
		await this.page.waitForNavigation();

		return true;
	}

	async wait_for_results() {
		await this.page.waitForSelector('#news', { timeout: 5000 });
		await this.sleep(2000);
	}

	async detected() {
		// TODO: I was actually never detected by bing news.
	}
}

module.exports = {
	BingNewsScraper: BingNewsScraper,
	BingScraper: BingScraper,
};