const getTimezoneOffset = (timezone, date)=>{
    try {
        const offsetPart = new Intl.DateTimeFormat('en', {
            timeZone: timezone,
            timeZoneName: 'longOffset'
        }).formatToParts(date).find((part)=>part.type === 'timeZoneName');
        const offset = offsetPart ? offsetPart.value : '';
        // We want to show time based on UTC, not GMT so we swap that.
        let utcOffset = offset.replace('GMT', 'UTC');
        // For perfect UTC (UTC+0:00) we only get the string UTC, So we need to append the 0's.
        if (!utcOffset.includes('+') && !utcOffset.includes('-')) {
            utcOffset = `${utcOffset}+00:00`;
        }
        return utcOffset;
    } catch (error) {
        // When timezone is invalid we catch the error and return empty to don't break the app
        return '';
    }
};
const getTimezones = (selectedDate)=>{
    const timezoneList = Intl.supportedValuesOf('timeZone').map((timezone)=>{
        // Timezone will be in the format GMT${OFFSET} where offset could be nothing,
        // a four digit string e.g. +05:00 or -08:00
        const utcOffset = getTimezoneOffset(timezone, selectedDate);
        // Offset and timezone are concatenated with '&', so to split and save the required timezone in DB
        return {
            offset: utcOffset,
            value: `${utcOffset}&${timezone}`
        };
    });
    const systemTimezone = timezoneList.find((timezone)=>timezone.value.split('&')[1] === Intl.DateTimeFormat().resolvedOptions().timeZone);
    return {
        timezoneList,
        systemTimezone
    };
};

export { getTimezoneOffset, getTimezones };
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