const https = require('https');
const url = 'https://www.foreca.fi';

const findValues = (data, startIndex) => {
    const windDirections = ['N','NE','E','SE','S','SW','W','NW']
    let min = data.indexOf('cclist', startIndex);
    let max = data.indexOf('cclist', min+1);
    let from=0, to=0, value="", location="", windDirection="", unit;
    if (max < 0) max = data.length-1;
    from = data.indexOf('val ', min);
    try {
        while (from >= 0) {
            from = data.indexOf('">', from);
            if(from > max || from < 0) break;
            to = data.indexOf(' ', from);
            value = data.slice(from+'">'.length, to);

            const indexTemp = from;
            from = data.indexOf('title="', from);
            if(from > max) from = indexTemp;
            else {
                to = data.indexOf('"', from+'title="'.length);
                windDirection = data.slice(from+'title="'.length, to);
                if(!windDirections.includes(windDirection)) from = indexTemp;
            }
            from = data.indexOf('blue">', from);
            if(from > max) break;
            to = data.indexOf('</', from);
            location = data.slice(from+'blue">'.length, to);

            unit = windDirections.includes(windDirection) ? "m/s " + windDirection : "°C";
            console.log(location, value, unit);
            from = data.indexOf('val ', to);
            if(from > max) break;
        }
    } catch (e) {
        console.log(e);
    }
}
const findTime = (data, className) => {
    let text = "";
    let time = "";
    const searchString = `<h3 class="${className}"><em>`
    let index = data.indexOf(searchString);
    if (index >= 0) {
        let from = index+searchString.length;
        try {
            let to = data.indexOf('</',from);
            text = data.slice(from, to);
            from = data.indexOf('klo', to);
            to = data.indexOf('</', from);
            time = data.slice(from, to);
        } catch (e) {
            console.log(e);
        }
    console.log(text, time);
    console.log("==========================================");
    findValues(data, index)
    }
}
const getPage = async () => {
    await https.get(url, (res) => {
        let data = '';
        res.on('data', (chunk) => {
            data += chunk;
        });
    // called when the complete response is received.
        res.on('end', () => {
            try {
              findTime(data, "tr_tmax");
              console.log("");
              findTime(data, "tr_tmin");
              console.log("");
              findTime(data, "tr_wind");
              console.log("");
            } catch (e) {
              console.error(e)
            }
        });
    }).on("error", (err) => {
        console.log("Error: ", err.message);
    });
}

getPage();