import * as http from 'http';

const port = 4202;
const youlessUri = 'http://192.168.2.68/a'

const server = http.createServer((req, res) => {

    http.request(youlessUri, response => {
        let str = ''
        response.on('data', function (chunk) {
            str += chunk;
        });

        response.on('end', function () {
            const parser = new Parser(str);

            res.end(parser.toPrometheusFormat())
        });
    }).end();

})

server.listen(port)


class Parser {
    public kWhTotal: number = null;
    public currentPowerWatt: number = null;

    constructor(
        private input: string
    ) {
        this.parse();
    }

    public toPrometheusFormat(): string {
        return [
            `kwh_total ${this.kWhTotal}`,
            `current_power_watt ${this.currentPowerWatt}`
            ].join('\n')
    }

    private parse() {
        const lines = this.input.split('\n')
            .map(line => line.trim())
            .map(line => line.split(' '))

        if (lines.length === 0) {
            return;
        }

        this.kWhTotal = parseFloat(lines[0][0]?.replace(',', '.'));
        this.currentPowerWatt = parseInt(lines[1][0])
    }


}