// convert influx csv output to JSON

export function csv2Json(str, delimiter = ",") {
    // slice from start of text to the first \n index
    // use split to create an array from string by delimiter
    const headers = str.slice(0, str.indexOf("\r\n")).split(delimiter).slice(3);
    let x = headers.findIndex((x) => (x === '_time') || (x === '_stop'))
    if (x != -1) {
        headers[x] = 'datetime'
    }
    // slice from \n index + 1 to the end of the text
    // use split to create an array of each csv value row
    const rows = str.slice(str.indexOf("\r\n") + 2).split("\r\n").slice(0,-2)

    // Map the rows
    // split values from each row into an array
    // use headers.reduce to create an object
    // object properties derived from headers:values
    // the object passed as an element of the array
    const arr = rows.map(function (row) {
        const values = row.split(delimiter).slice(3);
        const el = headers.reduce(function (object, header, index) {
            if(header !== 'datetime') {
                object[header] = parseFloat(values[index]);
            } else {
                object[header] = values[index];
            }
            return object;
        }, {});
        return el;
    });

    // return the array
    return arr;
}