/**
 * R3.D3.Pass.SSAO
 * @param graphics R3.GraphicsRuntime
 * @param apiPassSSAO R3.D3.API.Pass.SSAO
 * @constructor
 */
R3.D3.Pass.SSAO = function (
    graphics,
    apiPassSSAO
) {

    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (R3.Utils.UndefinedOrNull(apiPassSSAO)) {
        apiPassSSAO = {
            passType : R3.D3.API.Pass.PASS_TYPE_SSAO
        };
    }

	R3.D3.API.Pass.SSAO.call(
        this,
        apiPassSSAO,
        apiPassSSAO.scene,
        apiPassSSAO.camera,
        apiPassSSAO.radius,
        apiPassSSAO.onlyAO,
        apiPassSSAO.aoClamp,
        apiPassSSAO.lumInfluence
    );

    if (this.scene instanceof R3.D3.API.Scene) {
        this.scene = new R3.D3.Scene(
            this.graphics,
            this.scene
        )
    }

    if (this.camera instanceof R3.D3.API.Camera) {
        this.camera = new R3.D3.Camera(
            this.graphics,
            this.camera
        )
    }

    R3.D3.Pass.call(
        this,
        this.graphics,
        this
    );
};

R3.D3.Pass.SSAO.prototype = Object.create(R3.D3.Pass.prototype);
R3.D3.Pass.SSAO.prototype.constructor = R3.D3.Pass.SSAO;

/**
 * Create Pass.SSAO instance
 * @returns {*}
 */
R3.D3.Pass.SSAO.prototype.createInstance = function() {

    if (R3.Utils.UndefinedOrNull(this.scene) ||
        R3.Utils.UndefinedOrNull(this.scene.instance)
    ) {
        console.warn('scene not ready');
        return;
    }

    if (R3.Utils.UndefinedOrNull(this.camera) ||
        R3.Utils.UndefinedOrNull(this.camera.instance)
    ) {
        console.warn('camera not ready');
        return;
    }

    this.instance = new THREE.SSAOPass(
        this.scene.instance,
        this.camera.instance
    );

    this.instance.radius = this.radius;

    this.instance.onlyAO = this.onlyAO;

    this.instance.aoClamp = this.aoClamp;

    this.instance.lumInfluence = this.lumInfluence;

    console.log('Constructed an SSAO pass instance');

    R3.D3.Pass.prototype.createInstance.call(this);
};

/**
 * Update Pass.SSAO instance
 */
R3.D3.Pass.SSAO.prototype.updateInstance = function(property) {

    if (property === 'scene') {
        if (R3.Utils.UndefinedOrNull(this.instance)) {
            this.createInstance();
        }
        return;
    }

    if (property === 'camera') {
        if (R3.Utils.UndefinedOrNull(this.instance)) {
            this.createInstance();
        }
        return;
    }

    if (!this.instance) {
        return;
    }

    if (property === 'radius') {
        this.instance.radius = this.radius;
        return;
    }

    if (property === 'onlyAO') {
        this.instance.onlyAO = this.onlyAO;
        return;
    }

    if (property === 'aoClamp') {
        this.instance.aoClamp = this.aoClamp;
        return;
    }

    if (property === 'lumInfluence') {
        this.instance.lumInfluence = this.lumInfluence;
        return;
    }

    R3.D3.Pass.prototype.updateInstance.call(this, property);

};

/**
 * R3.D3.Pass.SSAO to R3.D3.API.Pass.SSAO
 * @returns {R3.D3.API.Pass.SSAO}
 */
R3.D3.Pass.SSAO.prototype.toApiObject = function() {

    var apiPass = R3.D3.Pass.prototype.toApiObject.call(this);

    var apiSSAOPass = new R3.D3.API.Pass.SSAO(
        apiPass,
        R3.Utils.IdOrNull(this.scene),
        R3.Utils.IdOrNull(this.camera),
        this.radius,
        this.onlyAO,
        this.aoClamp,
        this.lumInfluence
    );

    return apiSSAOPass;
};