Convert YouTube duration to something useful

Convert the useless string that comes back from YouTube API to an actual usable thing.

Convert YouTube duration to something useful

If you request a video duration from the YouTube API, you get back a string with PTXHXMXS sort of structure. That's rubbish for actual use. Here's a JavaScript function to convert it, it's filthy and it works:

function youtubeDurationToUseful(duration) {
    var hours = 0;
    var minutes = 0;
    var seconds = 0;

    // Remove PT from string ref: https://developers.google.com/youtube/v3/docs/videos#contentDetails.duration
    duration = duration.replace('PT','');

    // If the string contains hours parse it and remove it from our duration string
    if (duration.indexOf('H') > -1) {
        var hours_split = duration.split('H');
        hours = parseInt(hours_split[0]);
        duration  = hours_split[1];
    }

    // If the string contains minutes parse it and remove it from our duration string
    if (duration.indexOf('M') > -1) {
        var minutes_split = duration.split('M');
        minutes = parseInt(minutes_split[0]);
        duration = minutes_split[1];
    }

    // If the string contains seconds parse it and remove it from our duration string
    if (duration.indexOf('S') > -1) {
        var seconds_split = duration.split('S');
        seconds = parseInt(seconds_split[0]);
    }

    var str = "";
    
    if (hours != 0) { str += hours + ":"; }

    if (minutes == 0) { str += "00" + ":"; }
    else if (minutes < 10) { str += "0" + minutes + ":"; }
    else if (minutes > 10) { str += minutes + ":"; }

    if (seconds > 0 && seconds < 10) { str += "0" + seconds; }
    else if (seconds < 10) { str += "0" + seconds; }
    else if (seconds > 10) { str += seconds; }

    return str;
}