import { Vector4 } from '../math/Vector4.js';
import { Vector3 } from '../math/Vector3.js';
import { Vector2 } from '../math/Vector2.js';
import { Color } from '../math/Color.js';
import { StaticDrawUsage } from '../constants.js';

const _vector = /*@__PURE__*/ new Vector3();
const _vector2 = /*@__PURE__*/ new Vector2();

class BufferAttribute {

	constructor( array, itemSize, normalized ) {

		if ( Array.isArray( array ) ) {

			throw new TypeError( 'THREE.BufferAttribute: array should be a Typed Array.' );

		}

		this.name = '';

		this.array = array;
		this.itemSize = itemSize;
		this.count = array !== undefined ? array.length / itemSize : 0;
		this.normalized = normalized === true;

		this.usage = StaticDrawUsage;
		this.updateRange = { offset: 0, count: - 1 };

		this.version = 0;

	}

	onUploadCallback() {}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	setUsage( value ) {

		this.usage = value;

		return this;

	}

	copy( source ) {

		this.name = source.name;
		this.array = new source.array.constructor( source.array );
		this.itemSize = source.itemSize;
		this.count = source.count;
		this.normalized = source.normalized;

		this.usage = source.usage;

		return this;

	}

	copyAt( index1, attribute, index2 ) {

		index1 *= this.itemSize;
		index2 *= attribute.itemSize;

		for ( let i = 0, l = this.itemSize; i < l; i ++ ) {

			this.array[ index1 + i ] = attribute.array[ index2 + i ];

		}

		return this;

	}

	copyArray( array ) {

		this.array.set( array );

		return this;

	}

	copyColorsArray( colors ) {

		const array = this.array;
		let offset = 0;

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

			let color = colors[ i ];

			if ( color === undefined ) {

				console.warn( 'THREE.BufferAttribute.copyColorsArray(): color is undefined', i );
				color = new Color();

			}

			array[ offset ++ ] = color.r;
			array[ offset ++ ] = color.g;
			array[ offset ++ ] = color.b;

		}

		return this;

	}

	copyVector2sArray( vectors ) {

		const array = this.array;
		let offset = 0;

		for ( let i = 0, l = vectors.length; i < l; i ++ ) {

			let vector = vectors[ i ];

			if ( vector === undefined ) {

				console.warn( 'THREE.BufferAttribute.copyVector2sArray(): vector is undefined', i );
				vector = new Vector2();

			}

			array[ offset ++ ] = vector.x;
			array[ offset ++ ] = vector.y;

		}

		return this;

	}

	copyVector3sArray( vectors ) {

		const array = this.array;
		let offset = 0;

		for ( let i = 0, l = vectors.length; i < l; i ++ ) {

			let vector = vectors[ i ];

			if ( vector === undefined ) {

				console.warn( 'THREE.BufferAttribute.copyVector3sArray(): vector is undefined', i );
				vector = new Vector3();

			}

			array[ offset ++ ] = vector.x;
			array[ offset ++ ] = vector.y;
			array[ offset ++ ] = vector.z;

		}

		return this;

	}

	copyVector4sArray( vectors ) {

		const array = this.array;
		let offset = 0;

		for ( let i = 0, l = vectors.length; i < l; i ++ ) {

			let vector = vectors[ i ];

			if ( vector === undefined ) {

				console.warn( 'THREE.BufferAttribute.copyVector4sArray(): vector is undefined', i );
				vector = new Vector4();

			}

			array[ offset ++ ] = vector.x;
			array[ offset ++ ] = vector.y;
			array[ offset ++ ] = vector.z;
			array[ offset ++ ] = vector.w;

		}

		return this;

	}

	applyMatrix3( m ) {

		if ( this.itemSize === 2 ) {

			for ( let i = 0, l = this.count; i < l; i ++ ) {

				_vector2.fromBufferAttribute( this, i );
				_vector2.applyMatrix3( m );

				this.setXY( i, _vector2.x, _vector2.y );

			}

		} else if ( this.itemSize === 3 ) {

			for ( let i = 0, l = this.count; i < l; i ++ ) {

				_vector.fromBufferAttribute( this, i );
				_vector.applyMatrix3( m );

				this.setXYZ( i, _vector.x, _vector.y, _vector.z );

			}

		}

		return this;

	}

	applyMatrix4( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector.fromBufferAttribute( this, i );

			_vector.applyMatrix4( m );

			this.setXYZ( i, _vector.x, _vector.y, _vector.z );

		}

		return this;

	}

	applyNormalMatrix( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector.fromBufferAttribute( this, i );

			_vector.applyNormalMatrix( m );

			this.setXYZ( i, _vector.x, _vector.y, _vector.z );

		}

		return this;

	}

	transformDirection( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector.fromBufferAttribute( this, i );

			_vector.transformDirection( m );

			this.setXYZ( i, _vector.x, _vector.y, _vector.z );

		}

		return this;

	}

	set( value, offset = 0 ) {

		this.array.set( value, offset );

		return this;

	}

	getX( index ) {

		return this.array[ index * this.itemSize ];

	}

	setX( index, x ) {

		this.array[ index * this.itemSize ] = x;

		return this;

	}

	getY( index ) {

		return this.array[ index * this.itemSize + 1 ];

	}

	setY( index, y ) {

		this.array[ index * this.itemSize + 1 ] = y;

		return this;

	}

	getZ( index ) {

		return this.array[ index * this.itemSize + 2 ];

	}

	setZ( index, z ) {

		this.array[ index * this.itemSize + 2 ] = z;

		return this;

	}

	getW( index ) {

		return this.array[ index * this.itemSize + 3 ];

	}

	setW( index, w ) {

		this.array[ index * this.itemSize + 3 ] = w;

		return this;

	}

	setXY( index, x, y ) {

		index *= this.itemSize;

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;

		return this;

	}

	setXYZ( index, x, y, z ) {

		index *= this.itemSize;

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;
		this.array[ index + 2 ] = z;

		return this;

	}

	setXYZW( index, x, y, z, w ) {

		index *= this.itemSize;

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;
		this.array[ index + 2 ] = z;
		this.array[ index + 3 ] = w;

		return this;

	}

	onUpload( callback ) {

		this.onUploadCallback = callback;

		return this;

	}

	clone() {

		return new this.constructor( this.array, this.itemSize ).copy( this );

	}

	toJSON() {

		const data = {
			itemSize: this.itemSize,
			type: this.array.constructor.name,
			array: Array.prototype.slice.call( this.array ),
			normalized: this.normalized
		};

		if ( this.name !== '' ) data.name = this.name;
		if ( this.usage !== StaticDrawUsage ) data.usage = this.usage;
		if ( this.updateRange.offset !== 0 || this.updateRange.count !== - 1 ) data.updateRange = this.updateRange;

		return data;

	}

}

BufferAttribute.prototype.isBufferAttribute = true;

//

class Int8BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int8Array( array ), itemSize, normalized );

	}

}

class Uint8BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint8Array( array ), itemSize, normalized );

	}

}

class Uint8ClampedBufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint8ClampedArray( array ), itemSize, normalized );

	}

}

class Int16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int16Array( array ), itemSize, normalized );

	}

}

class Uint16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint16Array( array ), itemSize, normalized );

	}

}

class Int32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int32Array( array ), itemSize, normalized );

	}

}

class Uint32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint32Array( array ), itemSize, normalized );

	}

}

class Float16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint16Array( array ), itemSize, normalized );

	}

}

Float16BufferAttribute.prototype.isFloat16BufferAttribute = true;

class Float32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Float32Array( array ), itemSize, normalized );

	}

}

class Float64BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Float64Array( array ), itemSize, normalized );

	}

}

//

export {
	Float64BufferAttribute,
	Float32BufferAttribute,
	Float16BufferAttribute,
	Uint32BufferAttribute,
	Int32BufferAttribute,
	Uint16BufferAttribute,
	Int16BufferAttribute,
	Uint8ClampedBufferAttribute,
	Uint8BufferAttribute,
	Int8BufferAttribute,
	BufferAttribute
};
