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const minute = 60;
const hour = minute * 60;
const day = hour * 24;
const week = day * 7;
const year = day * 365.25;
const REGEX = /^(\+|\-)? ?(\d+|\d+\.\d+) ?(seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)(?: (ago|from now))?$/i;
export default (str) => {
const matched = REGEX.exec(str);
if (!matched || (matched[4] && matched[1])) {
throw new TypeError('Invalid time period format');
}
const value = parseFloat(matched[2]);
const unit = matched[3].toLowerCase();
let numericDate;
switch (unit) {
case 'sec':
case 'secs':
case 'second':
case 'seconds':
case 's':
numericDate = Math.round(value);
break;
case 'minute':
case 'minutes':
case 'min':
case 'mins':
case 'm':
numericDate = Math.round(value * minute);
break;
case 'hour':
case 'hours':
case 'hr':
case 'hrs':
case 'h':
numericDate = Math.round(value * hour);
break;
case 'day':
case 'days':
case 'd':
numericDate = Math.round(value * day);
break;
case 'week':
case 'weeks':
case 'w':
numericDate = Math.round(value * week);
break;
default:
numericDate = Math.round(value * year);
break;
}
if (matched[1] === '-' || matched[4] === 'ago') {
return -numericDate;
}
return numericDate;
};
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