S.UI = (function () {
  var input = document.querySelector('.ui-input'),
      ui = document.querySelector('.ui'),
      help = document.querySelector('.help'),
      commands = document.querySelector('.commands'),
      overlay = document.querySelector('.overlay'),
      canvas = document.querySelector('.canvas'),
      interval,
      isTouch = ('ontouchstart' in window || navigator.msMaxTouchPoints),
      currentAction,
      resizeTimer,
      time,
      maxShapeSize = 30,
      firstAction = true,
      sequence = [],
      cmd = '#';

  function formatTime(date) {
    var h = date.getHours(),
        m = date.getMinutes();

    m = m < 10 ? '0' + m : m;
    return h + ':' + m;
  }

  function getValue(value) {
    return value && value.split(' ')[1];
  }

  function getAction(value) {
    value = value && value.split(' ')[0];
    return value && value[0] === cmd && value.substring(1);
  }

  function timedAction(fn, delay, max, reverse) {
    clearInterval(interval);
    currentAction = reverse ? max : 1;
    fn(currentAction);

    if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
      interval = setInterval(function () {
        currentAction = reverse ? currentAction - 1 : currentAction + 1;
        fn(currentAction);

        if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
          clearInterval(interval);
        }
      }, delay);
    }
  }

  function reset(destroy) {
    clearInterval(interval);
    sequence = [];
    time = null;

    if (destroy) {
      S.Shape.switchShape(S.ShapeBuilder.letter(''));
    }
  }

  function performAction(value) {
    var action,
        current;

    overlay.classList.remove('overlay--visible');
    sequence = typeof(value) === 'object' ? value : sequence.concat(value.split('|'));
    input.value = '';
    checkInputWidth();

    timedAction(function () {
      current = sequence.shift();
      action = getAction(current);
      value = getValue(current);

      switch (action) {
      case 'countdown':
        value = parseInt(value, 10) || 10;
        value = value > 0 ? value : 10;

        timedAction(function (index) {
          if (index === 0) {
            if (sequence.length === 0) {
              S.Shape.switchShape(S.ShapeBuilder.letter(''));
            } else {
              performAction(sequence);
            }
          } else {
            S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
          }
        }, 1000, value, true);
        break;

      case 'rectangle':
        value = value && value.split('x');
        value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];

        S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0], 10)), Math.min(maxShapeSize, parseInt(value[1], 10))));
        break;

      case 'circle':
        value = parseInt(value, 10) || maxShapeSize;
        value = Math.min(value, maxShapeSize);
        S.Shape.switchShape(S.ShapeBuilder.circle(value));
        break;

      case 'time':
        var t = formatTime(new Date());

        if (sequence.length > 0) {
          S.Shape.switchShape(S.ShapeBuilder.letter(t));
        } else {
          timedAction(function () {
            t = formatTime(new Date());
            if (t !== time) {
              time = t;
              S.Shape.switchShape(S.ShapeBuilder.letter(time));
            }
          }, 1000);
        }
        break;

      case 'icon':
        S.ShapeBuilder.imageFile('font-awesome/' + value + '.png', function (obj) {
          S.Shape.switchShape(obj);
        });
        break;

      default:
        S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'What?' : current));
      }
    }, 2000, sequence.length);
  }

  function checkInputWidth() {
    if (input.value.length > 18) {
      ui.classList.add('ui--wide');
    } else {
      ui.classList.remove('ui--wide');
    }

    if (firstAction && input.value.length > 0) {
      ui.classList.add('ui--enter');
    } else {
      ui.classList.remove('ui--enter');
    }
  }

  function bindEvents() {
    document.body.addEventListener('keydown', function (e) {
      input.focus();

      if (e.keyCode === 13) {
        firstAction = false;
        reset();
        performAction(input.value);
      }
    });

    window.addEventListener('resize', function () {
      clearTimeout(resizeTimer);
      resizeTimer = setTimeout(function () {
        S.Shape.shuffleIdle();
        reset(true);
      }, 500);
    });

    input.addEventListener('input', checkInputWidth);
    input.addEventListener('change', checkInputWidth);
    input.addEventListener('focus', checkInputWidth);

    help.addEventListener('click', function () {
      overlay.classList.toggle('overlay--visible');

      if (overlay.classList.contains('overlay--visible')) {
        reset(true);
      }
    });

    commands.addEventListener('click', function (e) {
      var el,
          info,
          demo,
          url;

      if (e.target.classList.contains('commands-item')) {
        el = e.target;
      } else {
        el = e.target.parentNode.classList.contains('commands-item') ? e.target.parentNode : e.target.parentNode.parentNode;
      }

      info = el && el.querySelector('.commands-item-info');
      demo = el && info.getAttribute('data-demo');
      url = el && info.getAttribute('data-url');

      if (info) {
        overlay.classList.remove('overlay--visible');

        if (demo) {
          input.value = demo;

          if (isTouch) {
            reset();
            performAction(input.value);
          } else {
            input.focus();
          }
        } else if (url) {
          window.location = url;
        }
      }
    });

    canvas.addEventListener('click', function () {
      overlay.classList.remove('overlay--visible');
    });
  }

  return {
    init: function () {
      bindEvents();
      input.focus();

      if (isTouch) {
        document.body.classList.add('touch');
      }

      S.UI.Tabs.init();
    },

    simulate: function (action) {
      performAction(action);
    }
  };
}());