number-munchers/controllers/high-score/initials.controller.js

import * as WelcomeActions from '../../actions/welcome/welcome.actions';

let dispatch;

let initials = [
    { initial: 'A', active: true },
    { initial: 'A', active: false },
    { initial: 'A', active: false }
];

let active = 0;
let code;

const InitialsCtrl = {
    setDispatch: (d) => dispatch = d,

    keydown: function(e) {
        switch (e.keyCode) {
            case 37:
                active--;
                if (active === -1) {
                    active = initials.length - 1;
                }
                this.update();
                break;
            case 38:
                code = initials[active].initial.charCodeAt(0);
                code--;
                if (code === 64) {
                    code = 90;
                }
                initials[active].initial = String.fromCharCode(code);
                this.update();
                break;
            case 39:
                active++;
                if (active === initials.length) {
                    active = 0;
                }
                this.update();
                break;
            case 40:
                code = initials[active].initial.charCodeAt(0);
                code++;
                if (code === 91) {
                    code = 65;
                }
                initials[active].initial = String.fromCharCode(code);
                this.update();
                break;
        }

        if (e.keyCode >= 65 && e.keyCode <= 90) {
            initials[active].initial = String.fromCharCode(e.keyCode);

            if (active < initials.length - 1) {
                active++;
            }
            this.update();
        }
    },

    update: () => {
        initials = initials.map((v) => {
            v.active = false;
            return v;
        });

        initials[active].active = true;

        dispatch(WelcomeActions.updateInitials(initials));
    }
};

export default InitialsCtrl;