import {
	AnimationClip,
	BooleanKeyframeTrack,
	ColorKeyframeTrack,
	NumberKeyframeTrack,
	Vector3,
	VectorKeyframeTrack
} from 'three';

class AnimationClipCreator {

	static CreateRotationAnimation( period, axis = 'x' ) {

		const times = [ 0, period ], values = [ 0, 360 ];

		const trackName = '.rotation[' + axis + ']';

		const track = new NumberKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, period, [ track ] );

	}

	static CreateScaleAxisAnimation( period, axis = 'x' ) {

		const times = [ 0, period ], values = [ 0, 1 ];

		const trackName = '.scale[' + axis + ']';

		const track = new NumberKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, period, [ track ] );

	}

	static CreateShakeAnimation( duration, shakeScale ) {

		const times = [], values = [], tmp = new Vector3();

		for ( let i = 0; i < duration * 10; i ++ ) {

			times.push( i / 10 );

			tmp.set( Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0 ).
				multiply( shakeScale ).
				toArray( values, values.length );

		}

		const trackName = '.position';

		const track = new VectorKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, duration, [ track ] );

	}

	static CreatePulsationAnimation( duration, pulseScale ) {

		const times = [], values = [], tmp = new Vector3();

		for ( let i = 0; i < duration * 10; i ++ ) {

			times.push( i / 10 );

			const scaleFactor = Math.random() * pulseScale;
			tmp.set( scaleFactor, scaleFactor, scaleFactor ).
				toArray( values, values.length );

		}

		const trackName = '.scale';

		const track = new VectorKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, duration, [ track ] );

	}

	static CreateVisibilityAnimation( duration ) {

		const times = [ 0, duration / 2, duration ], values = [ true, false, true ];

		const trackName = '.visible';

		const track = new BooleanKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, duration, [ track ] );

	}

	static CreateMaterialColorAnimation( duration, colors ) {

		const times = [], values = [],
			timeStep = ( colors.length > 1 ) ? duration / ( colors.length - 1 ) : 0;

		for ( let i = 0; i < colors.length; i ++ ) {

			times.push( i * timeStep );

			const color = colors[ i ];
			values.push( color.r, color.g, color.b );

		}

		const trackName = '.material.color';

		const track = new ColorKeyframeTrack( trackName, times, values );

		return new AnimationClip( null, duration, [ track ] );

	}

}

export { AnimationClipCreator };
