/*
 * 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 cs.io;

import haxe.Int64;
import haxe.io.Bytes;
import haxe.io.Eof;
import haxe.io.Error;
import haxe.io.Input;

class NativeInput extends Input {
	public var canSeek(get, never):Bool;

	var stream:cs.system.io.Stream;
	var _eof:Bool;

	public function new(stream) {
		this.stream = stream;
		this._eof = false;
		if (!stream.CanRead)
			throw "Write-only stream";
	}

	override public function readByte():Int {
		var ret = stream.ReadByte();
		if (ret == -1) {
			_eof = true;
			throw new Eof();
		}
		return ret;
	}

	override public function readBytes(s:Bytes, pos:Int, len:Int):Int {
		if (pos < 0 || len < 0 || pos + len > s.length)
			throw Error.OutsideBounds;
		var ret = 0;
		var data = s.getData();
		try {
			ret = stream.Read(data, pos, len);
		} catch (e: Dynamic) {}
		if (ret == 0) {
			_eof = true;
			throw new Eof();
		}
		return ret;
	}

	override public function close():Void {
		stream.Close();
	}

	private inline function get_canSeek():Bool {
		return stream.CanSeek;
	}

	public function seek(p:Int, pos:sys.io.FileSeek):Void {
		_eof = false;
		var pos = switch (pos) {
			case SeekBegin: cs.system.io.SeekOrigin.Begin;
			case SeekCur: cs.system.io.SeekOrigin.Current;
			case SeekEnd: cs.system.io.SeekOrigin.End;
		};

		stream.Seek(cast(p, Int64), pos);
	}

	public function tell():Int {
		return cast(stream.Position, Int);
	}

	public inline function eof():Bool {
		return _eof;
	}
}