import {
	AnimationClip,
	AnimationMixer,
	Mesh
} from 'three';

class MorphAnimMesh extends Mesh {

	constructor( geometry, material ) {

		super( geometry, material );

		this.type = 'MorphAnimMesh';

		this.mixer = new AnimationMixer( this );
		this.activeAction = null;

	}

	setDirectionForward() {

		this.mixer.timeScale = 1.0;

	}

	setDirectionBackward() {

		this.mixer.timeScale = - 1.0;

	}

	playAnimation( label, fps ) {

		if ( this.activeAction ) {

			this.activeAction.stop();
			this.activeAction = null;

		}

		const clip = AnimationClip.findByName( this, label );

		if ( clip ) {

			const action = this.mixer.clipAction( clip );
			action.timeScale = ( clip.tracks.length * fps ) / clip.duration;
			this.activeAction = action.play();

		} else {

			throw new Error( 'THREE.MorphAnimMesh: animations[' + label + '] undefined in .playAnimation()' );

		}

	}

	updateAnimation( delta ) {

		this.mixer.update( delta );

	}

	copy( source ) {

		super.copy( source );

		this.mixer = new AnimationMixer( this );

		return this;

	}

}

export { MorphAnimMesh };
