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.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;
	}

	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,
};