import type * as I10nModule from "eez-studio-shared/i10n";
import { IUnit, UNITS } from "eez-studio-shared/units";
import { Unit as DlogUnit, IDlog } from "instrument/window/waveform/dlog-file";

export function dlogUnitToStudioUnit(unit: DlogUnit) {
    if (unit === DlogUnit.UNIT_VOLT) {
        return UNITS.volt;
    } else if (unit === DlogUnit.UNIT_AMPER) {
        return UNITS.ampere;
    } else if (unit === DlogUnit.UNIT_WATT) {
        return UNITS.watt;
    } else if (unit === DlogUnit.UNIT_SECOND) {
        return UNITS.time;
    } else if (unit === DlogUnit.UNIT_JOULE) {
        return UNITS.joule;
    } else {
        return UNITS.unknown;
    }
}

export function convertDlogToCsv(dlog: IDlog<IUnit>) {
    if (!dlog) {
        return undefined;
    }

    const { getLocale } =
        require("eez-studio-shared/i10n") as typeof I10nModule;

    const locale = getLocale();

    // determine CSV separator depending of locale usage of ","
    let separator;
    if ((0.1).toLocaleString(locale).indexOf(",") != -1) {
        separator = ";";
    } else {
        separator = ",";
    }

    const numberFormat = new Intl.NumberFormat(locale, {
        useGrouping: false,
        maximumFractionDigits: 9
    });

    // first row contains column names
    let csv = "";

    if (dlog.xAxis.label) {
        csv += dlog.xAxis.label;
    } else {
        csv += dlog.xAxis.unit.name;
    }

    for (let columnIndex = 0; columnIndex < dlog.yAxes.length; columnIndex++) {
        csv += separator;
        if (dlog.yAxes[columnIndex].label) {
            csv += dlog.yAxes[columnIndex].label;
        } else {
            csv += dlog.yAxes[columnIndex].unit.name;
        }
    }

    csv += "\n";

    //
    for (let rowIndex = 0; rowIndex < dlog.length; rowIndex++) {
        csv += numberFormat.format(rowIndex * dlog.xAxis.step);
        for (
            let columnIndex = 0;
            columnIndex < dlog.yAxes.length;
            columnIndex++
        ) {
            csv += separator;
            csv += numberFormat.format(dlog.getValue(rowIndex, columnIndex));
        }
        csv += "\n";
    }

    return Buffer.from(csv, "utf8");
}