Lambda-School-Labs/kansha-fe

/* Generates realative time strings */

//accepts any valid Date timestamp string!!
export const timeAgo = timestamp => {
    // get time in milliseconds
    const currentTime = new Date(Date.now()).getTime();
    const eventTime = new Date(timestamp).getTime()

    // get time elapsed in milliseconds
    const elapsedTime = currentTime - eventTime;
    
    // create time units in milliseconds
    const minute = 60 * 1000;
    const hour = minute * 60;
    const day = hour * 24;
    const week = day * 7;
    const month = week * 4;
    const year = day * 365;

    if (elapsedTime < minute) {
        return 'now';
    } else if (elapsedTime < hour) {
        let time = Math.round(elapsedTime / minute);
        return `${time} minute${time > 1 ? 's' : ''} ago`;
    } else if (elapsedTime < day) {
        let time = Math.round(elapsedTime / hour);
        return `${time} hour${time > 1 ? 's' : ''} ago`;
    } else if (elapsedTime < week) {
        let time = Math.round(elapsedTime / day);
        return `${time} day${time > 1 ? 's' : ''} ago`;
    } else if (elapsedTime < month) {
        let time = Math.round(elapsedTime / week);
        return `${time} week${time > 1 ? 's' : ''} ago`;
    } else if (elapsedTime < year) {
        let time = Math.round(elapsedTime / month);
        return `${time} month${time > 1 ? 's' : ''} ago`;
    } else {
        let time = Math.round(elapsedTime / year);
        return `${time} year${time > 1 ? 's' : ''} ago`;
    }
};