/*
The MIT License

Copyright © 2010-2021 three.js authors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

( function () {

	const _box = new THREE.Box3();

	const _vector = new THREE.Vector3();

	class LineSegmentsGeometry extends THREE.InstancedBufferGeometry {

		constructor() {

			super();
			this.type = 'LineSegmentsGeometry';
			const positions = [ - 1, 2, 0, 1, 2, 0, - 1, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 0, - 1, - 1, 0, 1, - 1, 0 ];
			const uvs = [ - 1, 2, 1, 2, - 1, 1, 1, 1, - 1, - 1, 1, - 1, - 1, - 2, 1, - 2 ];
			const index = [ 0, 2, 1, 2, 3, 1, 2, 4, 3, 4, 5, 3, 4, 6, 5, 6, 7, 5 ];
			this.setIndex( index );
			this.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
			this.setAttribute( 'uv', new THREE.Float32BufferAttribute( uvs, 2 ) );

		}

		applyMatrix4( matrix ) {

			const start = this.attributes.instanceStart;
			const end = this.attributes.instanceEnd;

			if ( start !== undefined ) {

				start.applyMatrix4( matrix );
				end.applyMatrix4( matrix );
				start.needsUpdate = true;

			}

			if ( this.boundingBox !== null ) {

				this.computeBoundingBox();

			}

			if ( this.boundingSphere !== null ) {

				this.computeBoundingSphere();

			}

			return this;

		}

		setPositions( array ) {

			let lineSegments;

			if ( array instanceof Float32Array ) {

				lineSegments = array;

			} else if ( Array.isArray( array ) ) {

				lineSegments = new Float32Array( array );

			}

			const instanceBuffer = new THREE.InstancedInterleavedBuffer( lineSegments, 6, 1 ); // xyz, xyz

			this.setAttribute( 'instanceStart', new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 0 ) ); // xyz

			this.setAttribute( 'instanceEnd', new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 3 ) ); // xyz
			//

			this.computeBoundingBox();
			this.computeBoundingSphere();
			return this;

		}

		setColors( array ) {

			let colors;

			if ( array instanceof Float32Array ) {

				colors = array;

			} else if ( Array.isArray( array ) ) {

				colors = new Float32Array( array );

			}

			const instanceColorBuffer = new THREE.InstancedInterleavedBuffer( colors, 6, 1 ); // rgb, rgb

			this.setAttribute( 'instanceColorStart', new THREE.InterleavedBufferAttribute( instanceColorBuffer, 3, 0 ) ); // rgb

			this.setAttribute( 'instanceColorEnd', new THREE.InterleavedBufferAttribute( instanceColorBuffer, 3, 3 ) ); // rgb

			return this;

		}

		fromWireframeGeometry( geometry ) {

			this.setPositions( geometry.attributes.position.array );
			return this;

		}

		fromEdgesGeometry( geometry ) {

			this.setPositions( geometry.attributes.position.array );
			return this;

		}

		fromMesh( mesh ) {

			this.fromWireframeGeometry( new THREE.WireframeGeometry( mesh.geometry ) ); // set colors, maybe

			return this;

		}

		fromLineSegments( lineSegments ) {

			const geometry = lineSegments.geometry;

			if ( geometry.isGeometry ) {

				console.error( 'THREE.LineSegmentsGeometry no longer supports Geometry. Use THREE.BufferGeometry instead.' );
				return;

			} else if ( geometry.isBufferGeometry ) {

				this.setPositions( geometry.attributes.position.array ); // assumes non-indexed

			} // set colors, maybe


			return this;

		}

		computeBoundingBox() {

			if ( this.boundingBox === null ) {

				this.boundingBox = new THREE.Box3();

			}

			const start = this.attributes.instanceStart;
			const end = this.attributes.instanceEnd;

			if ( start !== undefined && end !== undefined ) {

				this.boundingBox.setFromBufferAttribute( start );

				_box.setFromBufferAttribute( end );

				this.boundingBox.union( _box );

			}

		}

		computeBoundingSphere() {

			if ( this.boundingSphere === null ) {

				this.boundingSphere = new THREE.Sphere();

			}

			if ( this.boundingBox === null ) {

				this.computeBoundingBox();

			}

			const start = this.attributes.instanceStart;
			const end = this.attributes.instanceEnd;

			if ( start !== undefined && end !== undefined ) {

				const center = this.boundingSphere.center;
				this.boundingBox.getCenter( center );
				let maxRadiusSq = 0;

				for ( let i = 0, il = start.count; i < il; i ++ ) {

					_vector.fromBufferAttribute( start, i );

					maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector ) );

					_vector.fromBufferAttribute( end, i );

					maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector ) );

				}

				this.boundingSphere.radius = Math.sqrt( maxRadiusSq );

				if ( isNaN( this.boundingSphere.radius ) ) {

					console.error( 'THREE.LineSegmentsGeometry.computeBoundingSphere(): Computed radius is NaN. The instanced position data is likely to have NaN values.', this );

				}

			}

		}

		toJSON() { // todo
		}

		applyMatrix( matrix ) {

			console.warn( 'THREE.LineSegmentsGeometry: applyMatrix() has been renamed to applyMatrix4().' );
			return this.applyMatrix4( matrix );

		}

	}

	LineSegmentsGeometry.prototype.isLineSegmentsGeometry = true;

	THREE.LineSegmentsGeometry = LineSegmentsGeometry;

} )();