/* input.js — keyboard state. WASD / arrow keys drive; held A/D feeds the
 * steering smoothing in physics.js. R / N / [1-4] are edge-triggered actions. */
(function (TOW) {
  'use strict';

  function Input() {
    this.up = false; this.down = false; this.left = false; this.right = false;
    this.actions = []; // queue of one-shot actions: 'reset','next','prev','map:N'
    var self = this;

    function set(code, val, e) {
      switch (code) {
        case 'KeyW': case 'ArrowUp': self.up = val; e.preventDefault(); break;
        case 'KeyS': case 'ArrowDown': self.down = val; e.preventDefault(); break;
        case 'KeyA': case 'ArrowLeft': self.left = val; e.preventDefault(); break;
        case 'KeyD': case 'ArrowRight': self.right = val; e.preventDefault(); break;
      }
    }

    window.addEventListener('keydown', function (e) {
      if (e.repeat) { set(e.code, true, e); return; }
      set(e.code, true, e);
      switch (e.code) {
        case 'KeyR': self.actions.push('reset'); break;
        case 'KeyN': self.actions.push('next'); break;
        case 'KeyP': self.actions.push('prev'); break;
        case 'Digit1': self.actions.push('map:0'); break;
        case 'Digit2': self.actions.push('map:1'); break;
        case 'Digit3': self.actions.push('map:2'); break;
        case 'Digit4': self.actions.push('map:3'); break;
        case 'Digit5': self.actions.push('map:4'); break;
      }
    });
    window.addEventListener('keyup', function (e) { set(e.code, false, e); });
    // releasing focus shouldn't leave a key "stuck" down
    window.addEventListener('blur', function () {
      self.up = self.down = self.left = self.right = false;
    });
  }

  Input.prototype.drainActions = function () {
    var a = this.actions; this.actions = []; return a;
  };

  TOW.Input = Input;

})(window.TOW = window.TOW || {});