(function() {
  "use strict";

  var Creature = function(scene, spec, position) {
    this._id = tine.newId();
    this.scene = scene;
    this.creature = true;
    
    this.position       = position;
    this.imageId        = spec.image;
    this.team           = spec.team;
    this.life           = spec.life;
    this.totalLife      = spec.life;
    this.attack         = spec.attack;
    this.attackRate     = 1/spec.attack_rate; // rate attacks/second
    this.awareDistance  = spec.aware_distance
    this.attackDistance = spec.attack_distance
    this.speed          = spec.speed;
    this.height         = spec.height;
    this.width          = spec.width;
    this.order          = 'none'; //'attack', 'defend'
    this.role           = 'guardian';//'soldier'
    this.memory         = new b3.Blackboard();
    this.attackTime     = this.attackRate;

    this.attachedTo     = null;

    this.memory.set('boring', null);
    this.memory.set('target', null);
    this.memory.set('position', null);

    this.memory.set('nearestEnemy', null);
    this.memory.set('nearestEnemyDistance', null);


    this._draw();
  }
  var p = Creature.prototype

  // --------------------------------------------------------------------------
  // INTERNAL
  // --------------------------------------------------------------------------
  p._draw = function() {
    var radius = this.scene.planet.radius;
    var color = (this.team==='player'?'#FCD265':'#D86060');
    var movearea = (this.team==='player'?
                        game.data.random_move_area_player:
                        game.data.random_move_area_enemy);

    if (this.imageId) {
      this.display = game.create.bitmap(this.imageId, {
        regX:'center', 
        regY: radius+this.height+4
      });
    } else {
      this.display = new createjs.Shape();
      this.display.regX = 0;
      this.display.regY = radius+this.height;
      this.display.graphics
        .f(color)
        .r(-this.width/2, 0, this.width, this.height)
        .ef()
      
      // DEBUG
      .s('green')
      .dc(0, this.height, this.awareDistance)
      .s('red')
      .dc(0, this.height, this.attackDistance)
      .s('lightgrey')
      .dc(0, this.height, movearea)
      .es()
    }

    this.display.rotation = this.position;
  }
  p._updateMemory = function() {
    var circumference = this.scene.planet.circumference;

    // Structures and Creatures of the other team;
    var structures = this.scene.enemyStructures;
    var creatures = this.scene.enemyCreatures;
    if (this.team === 'enemy') {
      structures = this.scene.playerStructures;
      creatures = this.scene.playerCreatures;
    }

    var nearestEnemy = null;
    var nearestDist = 100000000000;

    // Verify nearest creature
    for (var i=0; i<creatures.length; i++) {
      var c = creatures[i];
      if (c.life > 0) {
        var dist = distance(this.position, c.position, circumference);
        if (dist < nearestDist) {
          nearestDist = dist;
          nearestEnemy = c;
        }
      }
    }

    // Verify nearest structure
    for (var i=0; i<structures.length; i++) {
      var c = structures[i];
      if (c.life > 0 && c.status === 'ground') {
        var dist = distance(this.position, c.position, circumference);
        if (dist < nearestDist) {
          nearestDist = dist;
          nearestEnemy = c;
        }
      }
    }
    this.memory.set('nearestEnemy', nearestEnemy);
    this.memory.set('nearestEnemyDistance', nearestDist);

    // update boring
    var boring = tine.clip(this.memory.get('boring')+game.time.fdelta, 0, 100);
    this.memory.set('boring', boring);
  }


  // --------------------------------------------------------------------------
  // INTERFACE
  // --------------------------------------------------------------------------
  p.goTo = function(position) {
    this.targetPosition = position;
  }

  p.move = function(direction) {
    if (direction > 0) {
      this.display.scaleX = -1;
    } else {
      this.display.scaleX = 1;
    }
    var position = this.position + this.speed*game.time.fdelta*direction;
    position =  (position<0)? 360+position%360 : position%360;
    this.position = position;
    this.display.rotation = position;
  }

  p.update = function() {
    if (this.life <= 0) return;

    this._updateMemory();
    game.ai.unit.tick(this, this.memory);
    // if (this._attack()) return;
    // if (this._move()) return;
  }

  // --------------------------------------------------------------------------
  // INTERACTION
  // --------------------------------------------------------------------------
  p.$damage = function(damage, creature) {
    if (this.life <= 0) return;
    this.scene.addAttackEffect(this.position, damage);

    this.life -= damage;
    if (this.life <= 0) {
      var self = this;
      this.scene.addKillEffect(this.position, this);
      createjs.Tween.get(this.display)
        .to({alpha:0}, 500)
        .call(function() {
          self.scene.removeCreature(self);
        });

      return true;
    }

    if (this.status !== 'attacking') {
      this.status = 'attacking';
      this.attackTargetPosition = creature.position;
    }
  }

  window.Creature = Creature;
})();