module.exports = function parseCsv(input) {
    const rows = [];
    let row = [];
    let field = "";
    let quoted = false;

    for (let index = 0; index < input.length; index += 1) {
        const character = input[index];
        const nextCharacter = input[index + 1];

        if (character === '"' && quoted && nextCharacter === '"') {
            field += '"';
            index += 1;
        } else if (character === '"') {
            quoted = !quoted;
        } else if (character === "," && !quoted) {
            row.push(field);
            field = "";
        } else if ((character === "\n" || character === "\r") && !quoted) {
            if (character === "\r" && nextCharacter === "\n") index += 1;
            row.push(field);
            if (row.some(value => value.trim() !== "")) rows.push(row);
            row = [];
            field = "";
        } else {
            field += character;
        }
    }

    if (quoted) throw new Error("CSV bevat een niet afgesloten tekstveld.");

    row.push(field);
    if (row.some(value => value.trim() !== "")) rows.push(row);

    return rows;
};