//
// this component operates on it's parent entity's bounding box.
// so, you can't use this component with a null-mesh.
//
GameLib.D3.ComponentTriggerBoxBox = function ComponentTriggerBoxBox(
    id,
    name,
    entitiesToCheck,
    onInside,
    onEnter,
    onLeave,
    onSetParent
) {
    console.log('triggerbox box!');

    this.id = id || GameLib.D3.Tools.RandomId();

    if (typeof name == 'undefined') {
        name = this.constructor.name;
    }
    this.name = name;

    this.parentEntity = null;

    // Todo: this should be executed somewhere in game-lib-z, so that we don't execute it on every construction of an object.
    GameLib.D3.Utils.Extend(GameLib.D3.ComponentTriggerBoxBox, GameLib.D3.ComponentInterface);

    this.entitiesToCheck = entitiesToCheck || [];
    this.onInside = onInside || null;
    this.onEnter = onEnter || null;
    this.onLeave = onLeave || null;
    this.onSetParent = onSetParent || null;

    // runtime code
    this.entitiesInside = [];
};

if(typeof THREE != "undefined") {
    ComponentTriggerBoxBox_BB = new THREE.Box3();
    ComponentTriggerBoxBox_BBEntity = new THREE.Box3();
}


///////////////////////// Methods to override //////////////////////////
GameLib.D3.ComponentTriggerBoxBox.prototype.onUpdate = function(
    deltaTime,
    parentEntity
) {

    if(parentEntity.mesh) {
        // Calculate the current transform here, using the position, orientation and scale of the entity.

        ComponentTriggerBoxBox_BB.setFromObject(parentEntity.mesh);

        for(var e in this.entitiesToCheck) {
            var entityToCheck = this.entitiesToCheck[e];

            ComponentTriggerBoxBox_BBEntity.setFromObject(entityToCheck.mesh);

            if(ComponentTriggerBoxBox_BB.intersectsBox(ComponentTriggerBoxBox_BBEntity)) {

                if(this.entitiesInside.indexOf(entityToCheck) <= -1) { // check if this is the first time the entity enters the trigger
                    this.entitiesInside.push(entityToCheck);

                    if(this.onEnter) {
                        if(this.onEnter(parentEntity, entityToCheck)) {
                            break;
                        }
                    }
                }


                if(this.onInside) {
                    if(this.onInside(parentEntity, entityToCheck)) {
                        break;
                    }
                }

            } else if(this.entitiesInside.indexOf(entityToCheck) > -1) { // entity WAS inside the trigger
                this.entitiesInside.splice(this.entitiesInside.indexOf(entityToCheck), 1);

                if(this.onLeave) {
                    if(this.onLeave(parentEntity, entityToCheck)) {
                        break;
                    }
                }
            }

        }
    }
};

GameLib.D3.ComponentTriggerBoxBox.prototype.onSetParentEntity = function(
    parentScene,
    parentEntity
) {
    if(this.onSetParent) {
        this.onSetParent(parentScene, parentEntity);
    }
};