const fetch = require('node-fetch');
const https = require('https');
const parser = require('node-html-parser');

const httpsAgent = new https.Agent({
	rejectUnauthorized: false
});

class RsaProvider {
	static async getProcessId(number, vin, dateStr, token) {
		let url = 'https://dkbm-web.autoins.ru/dkbm-web-1.0/policyInfo.htm';
		let result = await fetch(url, { 
			method: 'POST',
			body: new URLSearchParams({
				requestDate: dateStr,
				licensePlate: number,
				vin: vin,
				isBsoRequest: false,
				captcha: token
			}),
			agent: httpsAgent
		});

		let json = await result.json();
		if(!json.validCaptcha) {
			throw Error('Invalid captcha token');
		}

		if(!json.processId) {
			throw Error('Process ID is null');      
		}

		return json.processId;
	}

	static async getReportHtml(number, vin, dateStr, processId) {
		let url = 'https://dkbm-web.autoins.ru/dkbm-web-1.0/policyInfoData.htm';
		let result = await fetch(url, { 
			method: 'POST',
			body: new URLSearchParams({
				requestDate: dateStr,
				licensePlate: number,
				vin: vin,
				isBsoRequest: false,
				processId
			}),
			agent: httpsAgent
		});

		return await result.text();
	}

	static parseReport(html) {
		let root = parser.parse(html);
		if(!root) {
			throw Error('Failed to parse dkbm response');
		}
	
		let tr = root.querySelector('.data-row');
		if(tr) {
			let data = tr.childNodes.filter(n => n.nodeType == 1);
			let result = {
				number: data[1].rawText,
				name: data[2].rawText,
				status: data[3].rawText,
				restrictions: data[9].rawText,
				insurant: data[10].rawText,
				owner: data[11].rawText,
				usageRegion: data[13].rawText    
			};
	
			let vehicleData = data[5].querySelectorAll('td');
			if(vehicleData.length > 0) {
				result.plateNumber = vehicleData[3].rawText;
				result.vin = vehicleData[5].rawText;
			}
	
			return result;
		} else {
			throw Error('Failed to find data in dkbm response');
		}
	}

	static async checkOsago(number, vin, timestamp, token) {
		let date = new Date(timestamp*1000);
		let dateStr = `${date.getDate()}.${date.getMonth() + 1}.${date.getFullYear()}`;
		let processId = await this.getProcessId(number, vin, dateStr, token);
		let reportHtml = await this.getReportHtml(number, vin, dateStr, processId);
		let report = this.parseReport(reportHtml);
		report.date = timestamp;
		return report;
	}
}

module.exports = RsaProvider;