import { Vector3 } from '../math/Vector3.js';
import { BufferAttribute } from './BufferAttribute.js';

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

class InterleavedBufferAttribute {
	constructor(interleavedBuffer, itemSize, offset, normalized = false) {
		this.name = '';

		this.data = interleavedBuffer;
		this.itemSize = itemSize;
		this.offset = offset;

		this.normalized = normalized === true;
	}

	get count() {
		return this.data.count;
	}

	get array() {
		return this.data.array;
	}

	set needsUpdate(value) {
		this.data.needsUpdate = value;
	}

	applyMatrix4(m) {
		for (let i = 0, l = this.data.count; i < l; i++) {
			_vector.x = this.getX(i);
			_vector.y = this.getY(i);
			_vector.z = this.getZ(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.x = this.getX(i);
			_vector.y = this.getY(i);
			_vector.z = this.getZ(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.x = this.getX(i);
			_vector.y = this.getY(i);
			_vector.z = this.getZ(i);

			_vector.transformDirection(m);

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

		return this;
	}

	setX(index, x) {
		this.data.array[index * this.data.stride + this.offset] = x;

		return this;
	}

	setY(index, y) {
		this.data.array[index * this.data.stride + this.offset + 1] = y;

		return this;
	}

	setZ(index, z) {
		this.data.array[index * this.data.stride + this.offset + 2] = z;

		return this;
	}

	setW(index, w) {
		this.data.array[index * this.data.stride + this.offset + 3] = w;

		return this;
	}

	getX(index) {
		return this.data.array[index * this.data.stride + this.offset];
	}

	getY(index) {
		return this.data.array[index * this.data.stride + this.offset + 1];
	}

	getZ(index) {
		return this.data.array[index * this.data.stride + this.offset + 2];
	}

	getW(index) {
		return this.data.array[index * this.data.stride + this.offset + 3];
	}

	setXY(index, x, y) {
		index = index * this.data.stride + this.offset;

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

		return this;
	}

	setXYZ(index, x, y, z) {
		index = index * this.data.stride + this.offset;

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

		return this;
	}

	setXYZW(index, x, y, z, w) {
		index = index * this.data.stride + this.offset;

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

		return this;
	}

	clone(data) {
		if (data === undefined) {
			console.log('THREE.InterleavedBufferAttribute.clone(): Cloning an interlaved buffer attribute will deinterleave buffer data.');

			const array = [];

			for (let i = 0; i < this.count; i++) {
				const index = i * this.data.stride + this.offset;

				for (let j = 0; j < this.itemSize; j++) {
					array.push(this.data.array[index + j]);
				}
			}

			return new BufferAttribute(new this.array.constructor(array), this.itemSize, this.normalized);
		} else {
			if (data.interleavedBuffers === undefined) {
				data.interleavedBuffers = {};
			}

			if (data.interleavedBuffers[this.data.uuid] === undefined) {
				data.interleavedBuffers[this.data.uuid] = this.data.clone(data);
			}

			return new InterleavedBufferAttribute(data.interleavedBuffers[this.data.uuid], this.itemSize, this.offset, this.normalized);
		}
	}

	toJSON(data) {
		if (data === undefined) {
			console.log('THREE.InterleavedBufferAttribute.toJSON(): Serializing an interlaved buffer attribute will deinterleave buffer data.');

			const array = [];

			for (let i = 0; i < this.count; i++) {
				const index = i * this.data.stride + this.offset;

				for (let j = 0; j < this.itemSize; j++) {
					array.push(this.data.array[index + j]);
				}
			}

			// deinterleave data and save it as an ordinary buffer attribute for now

			return {
				itemSize: this.itemSize,
				type: this.array.constructor.name,
				array: array,
				normalized: this.normalized,
			};
		} else {
			// save as true interlaved attribtue

			if (data.interleavedBuffers === undefined) {
				data.interleavedBuffers = {};
			}

			if (data.interleavedBuffers[this.data.uuid] === undefined) {
				data.interleavedBuffers[this.data.uuid] = this.data.toJSON(data);
			}

			return {
				isInterleavedBufferAttribute: true,
				itemSize: this.itemSize,
				data: this.data.uuid,
				offset: this.offset,
				normalized: this.normalized,
			};
		}
	}
}

InterleavedBufferAttribute.prototype.isInterleavedBufferAttribute = true;

export { InterleavedBufferAttribute };