Im trying to modify a FNF mod to randomize the jumpscare that appears but simply: nothing appears?

function eventFunction(params) {
    var length:Float = Std.parseFloat(params[1]);
    var portrait:String = 'Gold';
    switch (PlayState.dadOpponent.curCharacter.toLowerCase()) {
        case 'gold-headless':
        var i = math.round(math.random(1, 3))
            switch (i) {
                case (i == 1):
                portrait = 'GoldAlt';
                break;
                case (i == 2):
                portrait = 'GoldAlt2';
                break;
                case (i == 3):
                portrait = 'GoldAlt3';
                break;
            }
    }

heres the code. i have 3 images set up and when i remove the switch thing an image does show up, but when i want 3 random different images for the game to pick from then nothing shows up. sry if this is stupid but im really bad at javascript