/*
 * Copyright (C)2005-2019 Haxe Foundation
 *
 * 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.
 */

package haxe.io;

typedef Float32ArrayData = ArrayBufferView.ArrayBufferViewData;

abstract Float32Array(Float32ArrayData) {
	public static inline var BYTES_PER_ELEMENT = 4;

	public var length(get, never):Int;
	public var view(get, never):ArrayBufferView;

	public inline function new(elements:Int) {
		this = new ArrayBufferView(elements * BYTES_PER_ELEMENT).getData();
	}

	inline function get_length() {
		return this.byteLength >> 2;
	}

	public inline function get_view():ArrayBufferView {
		return ArrayBufferView.fromData(this);
	}

	@:arrayAccess public inline function get(index:Int):Float {
		return this.bytes.getFloat((index << 2) + this.byteOffset);
	}

	@:arrayAccess public inline function set(index:Int, value:Float):Float {
		if (index >= 0 && index < length) {
			this.bytes.setFloat((index << 2) + this.byteOffset, value);
			return value;
		}
		return 0;
	}

	public inline function sub(begin:Int, ?length:Int):Float32Array {
		return fromData(this.sub(begin << 2, length == null ? null : length << 2));
	}

	public inline function subarray(?begin:Int, ?end:Int):Float32Array {
		return fromData(this.subarray(begin == null ? null : begin << 2, end == null ? null : end << 2));
	}

	public inline function getData():Float32ArrayData {
		return this;
	}

	public static function fromData(d:Float32ArrayData):Float32Array {
		return cast d;
	}

	public static function fromArray(a:Array<Float>, pos = 0, ?length:Int):Float32Array {
		if (length == null)
			length = a.length - pos;
		if (pos < 0 || length < 0 || pos + length > a.length)
			throw Error.OutsideBounds;
		var i = new Float32Array(a.length);
		for (idx in 0...length)
			i[idx] = a[idx + pos];
		return i;
	}

	public static function fromBytes(bytes:haxe.io.Bytes, bytePos = 0, ?length:Int):Float32Array {
		return fromData(ArrayBufferView.fromBytes(bytes, bytePos, (length == null ? (bytes.length - bytePos) >> 2 : length) << 2).getData());
	}
}
