// This function is slow
export function getDateString(
    date: Date,
    utc: boolean,
    millis: boolean,
): string {
    const year = utc ? date.getUTCFullYear() : date.getFullYear();
    const month = (
        (utc ? date.getMonth() : date.getMonth()) + 1
    ).toLocaleString('en-US', {
        minimumIntegerDigits: 2,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const day = (utc ? date.getUTCDate() : date.getDate()).toLocaleString(
        'en-US',
        {
            minimumIntegerDigits: 2,
            useGrouping: false,
            maximumFractionDigits: 0,
        },
    );
    const hour = (utc ? date.getUTCHours() : date.getHours()).toLocaleString(
        'en-US',
        {
            minimumIntegerDigits: 2,
            useGrouping: false,
            maximumFractionDigits: 0,
        },
    );
    const minute = (
        utc ? date.getUTCMinutes() : date.getMinutes()
    ).toLocaleString('en-US', {
        minimumIntegerDigits: 2,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const second = (
        utc ? date.getUTCSeconds() : date.getSeconds()
    ).toLocaleString('en-US', {
        minimumIntegerDigits: 2,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const milliseconds = (
        utc ? date.getUTCMilliseconds() : date.getMilliseconds()
    ).toLocaleString('en-US', {
        minimumIntegerDigits: 3,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    return `${year}/${month}/${day} ${hour}:${minute}:${second}${millis ? `.${milliseconds}` : ''}${utc ? 'Z' : ''}`;
}

export function getDurationString(duration_millis: number): string {
    const millis = duration_millis % 1000;
    const duration_secs = Math.floor(duration_millis / 1000);
    const seconds = duration_secs % 60;
    const duration_minutes = Math.floor(duration_secs / 60);
    const minutes = duration_minutes % 60;
    const duration_hours = Math.floor(duration_minutes / 60);

    const millis_str = millis.toLocaleString('en-US', {
        minimumIntegerDigits: 3,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const seconds_str = seconds.toLocaleString('en-US', {
        minimumIntegerDigits: 2,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const minutes_str = minutes.toLocaleString('en-US', {
        minimumIntegerDigits: 2,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    const hours_str = duration_hours.toLocaleString('en-US', {
        minimumIntegerDigits: 1,
        useGrouping: false,
        maximumFractionDigits: 0,
    });
    return `${hours_str}:${minutes_str}:${seconds_str}.${millis_str}`;
}

export function parseDurationString(duration: string): number {
    const parts = duration.split(':');
    const seconds_str = parts.length >= 1 ? parts[parts.length - 1] : '0';
    const minutes_str = parts.length >= 2 ? parts[parts.length - 2] : '0';
    const hours_str = parts.length >= 3 ? parts[parts.length - 3] : '0';

    const seconds = Number.parseFloat(seconds_str);
    const minutes = Number.parseFloat(minutes_str);
    const hours = Number.parseFloat(hours_str);

    return Math.floor(((hours * 60 + minutes) * 60 + seconds) * 1000);
}