/*
 * 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 hl.types;

import haxe.iterators.ArrayIterator;
import haxe.iterators.ArrayKeyValueIterator;

@:keep
@:generic
class BytesIterator<T> extends ArrayIterator<T> {
	var a:ArrayBytes<T>;

	public function new(a) {
		super((null:Dynamic));
		this.a = a;
	}

	override public function hasNext() {
		return current < a.length;
	}

	override public function next():T {
		return @:privateAccess a.bytes.get(current++);
	}
}

@:keep
@:generic class ArrayBytes<T> extends ArrayBase {
	var bytes:hl.BytesAccess<T>;
	var size:Int;

	public function new() {
		size = length = 0;
		bytes = null;
	}

	public function concat(a:ArrayBytes<T>):ArrayBytes<T> {
		var ac = new ArrayBytes<T>();
		ac.length = ac.size = length + a.length;
		ac.bytes = new Bytes(ac.length << bytes.sizeBits);
		var offset = length << bytes.sizeBits;
		(ac.bytes : Bytes).blit(0, this.bytes, 0, offset);
		(ac.bytes : Bytes).blit(offset, a.bytes, 0, a.length << bytes.sizeBits);
		return ac;
	}

	override function join(sep:String):String {
		var s = new StringBuf();
		for (i in 0...length) {
			if (i > 0)
				s.add(sep);
			s.add(bytes[i]);
		}
		return s.toString();
	}

	public function pop():Null<T> {
		if (length == 0)
			return null;
		length--;
		var v = bytes[length];
		bytes[length] = cast 0;
		return v;
	}

	public function push(x:T):Int {
		var len = length;
		if (size == len)
			__expand(len);
		else
			length++;
		bytes[len] = x;
		return length;
	}

	override function reverse():Void {
		for (i in 0...length >> 1) {
			var k = length - 1 - i;
			var tmp = bytes[i];
			bytes[i] = bytes[k];
			bytes[k] = tmp;
		}
	}

	public function shift():Null<T> {
		if (length == 0)
			return null;
		var v = bytes[0];
		length--;
		(bytes : Bytes).blit(0, bytes, 1 << bytes.sizeBits, length << bytes.sizeBits);
		bytes[length] = cast 0;
		return v;
	}

	override function blit(pos:Int, src:ArrayBase.ArrayAccess, srcpos:Int, len:Int):Void {
		var src = (cast src : ArrayBytes<T>);
		if (pos < 0 || srcpos < 0 || len < 0 || pos + len > length || srcpos + len > src.length)
			throw haxe.io.Error.OutsideBounds;
		(bytes : Bytes).blit(pos << bytes.sizeBits, src.bytes, srcpos << bytes.sizeBits, len << bytes.sizeBits);
	}

	override function slice(pos:Int, ?end:Int):ArrayBytes<T> {
		if (pos < 0) {
			pos = this.length + pos;
			if (pos < 0)
				pos = 0;
		}
		var pend:Int;
		if (end == null)
			pend = this.length;
		else {
			pend = end;
			if (pend < 0)
				pend += this.length;
			if (pend > this.length)
				pend = this.length;
		}
		var len = pend - pos;
		if (len < 0)
			return new ArrayBytes<T>();
		var a = new ArrayBytes<T>();
		a.length = a.size = len;
		a.bytes = (bytes : Bytes).sub(pos << bytes.sizeBits, len << bytes.sizeBits);
		return a;
	}

	public function sort(f:T->T->Int):Void {
		if (Type.get((cast null : T)) == Type.get(0))
			(bytes : Bytes).sortI32(0, length, cast f);
		else
			(bytes : Bytes).sortF64(0, length, cast f);
	}

	override function splice(pos:Int, len:Int):ArrayBytes<T> {
		if (len < 0)
			return new ArrayBytes<T>();
		if (pos < 0) {
			pos = this.length + pos;
			if (pos < 0)
				pos = 0;
		}
		if (pos > this.length) {
			pos = 0;
			len = 0;
		} else if (pos + len > this.length) {
			len = this.length - pos;
			if (len < 0)
				len = 0;
		}
		if (len == 0)
			return new ArrayBytes<T>();
		var ret = new ArrayBytes<T>();
		ret.bytes = (bytes : Bytes).sub(pos << bytes.sizeBits, len << bytes.sizeBits);
		ret.size = ret.length = len;
		var end = pos + len;
		(bytes : Bytes).blit(pos << bytes.sizeBits, bytes, end << bytes.sizeBits, (length - end) << bytes.sizeBits);
		(bytes : Bytes).fill((length - len) << bytes.sizeBits, (len) << bytes.sizeBits, 0);
		length -= len;
		return ret;
	}

	override function toString():String {
		var b = new StringBuf();
		b.addChar("[".code);
		for (i in 0...length) {
			if (i > 0)
				b.addChar(",".code);
			b.add(bytes[i]);
		}
		b.addChar("]".code);
		return b.toString();
	}

	public function unshift(x:T):Void {
		if (length == size)
			__expand(length)
		else
			length++;
		(bytes : Bytes).blit(1 << bytes.sizeBits, bytes, 0, (length - 1) << bytes.sizeBits);
		bytes[0] = x;
	}

	public function insert(pos:Int, x:T):Void {
		if (pos < 0) {
			pos = length + pos;
			if (pos < 0)
				pos = 0;
		} else if (pos > length)
			pos = length;
		if (length == size)
			__expand(length)
		else
			length++;
		(bytes : Bytes).blit((pos + 1) << bytes.sizeBits, bytes, pos << bytes.sizeBits, (length - pos - 1) << bytes.sizeBits);
		bytes[pos] = x;
	}

	public function contains(x:T):Bool {
		return indexOf(x) != -1;
	}

	public function remove(x:T):Bool {
		var idx = indexOf(x);
		if (idx < 0)
			return false;
		length--;
		(bytes : hl.Bytes).blit(idx << bytes.sizeBits, bytes, (idx + 1) << bytes.sizeBits, (length - idx) << bytes.sizeBits);
		return true;
	}

	public function indexOf(x:T, ?fromIndex:Int):Int {
		var idx:Int = fromIndex == null ? 0 : fromIndex;
		if (idx < 0) {
			idx += length;
			if (idx < 0)
				idx = 0;
		}
		for (i in idx...length)
			if (bytes[i] == x)
				return i;
		return -1;
	}

	public function lastIndexOf(x:T, ?fromIndex:Int):Int {
		var len = length;
		var i:Int = fromIndex != null ? fromIndex : len - 1;
		if (i >= len)
			i = len - 1;
		else if (i < 0)
			i += len;
		while (i >= 0) {
			if (bytes[i] == x)
				return i;
			i--;
		}
		return -1;
	}

	public function copy():ArrayBytes<T> {
		var a = new ArrayBytes<T>();
		a.length = a.size = length;
		a.bytes = new Bytes(length << bytes.sizeBits);
		(a.bytes : Bytes).blit(0, bytes, 0, length << bytes.sizeBits);
		return a;
	}

	public function iterator():ArrayIterator<T> {
		return new BytesIterator(this);
	}

	public function keyValueIterator() : ArrayKeyValueIterator<T> {
		return new ArrayKeyValueIterator<T>(cast this);
	}

	public function map<S>(f:T->S):ArrayDyn@:privateAccess {
		var a = new ArrayObj();
		if (length > 0)
			a.__expand(length - 1);
		for (i in 0...length)
			a.array[i] = f(bytes[i]);
		return ArrayDyn.alloc(a, true);
	}

	public function filter(f:T->Bool):ArrayBytes<T> {
		var a = new ArrayBytes<T>();
		for (i in 0...length) {
			var v = bytes[i];
			if (f(v))
				a.push(v);
		}
		return a;
	}

	override public function resize(len:Int):Void {
		if (length < len) {
			__expand(len - 1);
		} else if (length > len) {
			(bytes : Bytes).fill(len << bytes.sizeBits, (length - len) << bytes.sizeBits, 0);
			this.length = len;
		}
	}

	override function getDyn(pos:Int):Dynamic {
		var pos:UInt = pos;
		if (pos >= length)
			return bytes.nullValue;
		return bytes[pos];
	}

	override function setDyn(pos:Int, v:Dynamic) {
		var pos:UInt = pos;
		if (pos >= length)
			__expand(pos);
		bytes[pos] = v;
	}

	override function pushDyn(v:Dynamic)
		return push(v);

	override function popDyn():Null<Dynamic>
		return pop();

	override function shiftDyn():Null<Dynamic>
		return shift();

	override function unshiftDyn(v:Dynamic)
		unshift(v);

	override function insertDyn(pos:Int, v:Dynamic)
		insert(pos, v);

	override function containsDyn(v:Dynamic)
		return contains(v);

	override function removeDyn(v:Dynamic)
		return remove(v);

	override function sortDyn(f:Dynamic->Dynamic->Int)
		sort(f);

	// called by compiler when accessing the array outside of its bounds, might trigger resize
	function __expand(index:Int) {
		if (index < 0)
			throw "Invalid array index " + index;
		var newlen = index + 1;
		if (newlen > size) {
			var next = (size * 3) >> 1;
			if (next < newlen)
				next = newlen;
			var bytes2 = new hl.Bytes(next << bytes.sizeBits);
			var bsize = length << bytes.sizeBits;
			bytes2.blit(0, bytes, 0, bsize);
			bytes2.fill(bsize, (next << bytes.sizeBits) - bsize, 0);
			bytes = bytes2;
			size = next;
		}
		length = newlen;
	}
}

typedef ArrayI32 = ArrayBytes<Int>;
typedef ArrayUI16 = ArrayBytes<UI16>;
typedef ArrayF32 = ArrayBytes<F32>;
typedef ArrayF64 = ArrayBytes<Float>;
typedef ArrayI64 = ArrayBytes<I64>;
