/*
 * 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 sys.net;

import haxe.io.Error;

@:callable
@:coreType
abstract SocketHandle {}

private class SocketOutput extends haxe.io.Output {
	var __s:SocketHandle;

	public function new(s) {
		__s = s;
	}

	public override function writeByte(c:Int) {
		try {
			socket_send_char(__s, c);
		} catch (e:Dynamic) {
			if (e == "Blocking")
				throw Blocked;
			else if (e == "EOF")
				throw new haxe.io.Eof();
			else
				throw Custom(e);
		}
	}

	public override function writeBytes(buf:haxe.io.Bytes, pos:Int, len:Int):Int {
		return try {
			socket_send(__s, buf.getData(), pos, len);
		} catch (e:Dynamic) {
			if (e == "Blocking")
				throw Blocked;
			else
				throw Custom(e);
		}
	}

	public override function close() {
		super.close();
		if (__s != null)
			socket_close(__s);
	}

	private static var socket_close = neko.Lib.load("std", "socket_close", 1);
	private static var socket_send_char = neko.Lib.load("std", "socket_send_char", 2);
	private static var socket_send = neko.Lib.load("std", "socket_send", 4);
}

private class SocketInput extends haxe.io.Input {
	var __s:SocketHandle;

	public function new(s) {
		__s = s;
	}

	public override function readByte():Int {
		return try {
			socket_recv_char(__s);
		} catch (e:Dynamic) {
			if (e == "Blocking")
				throw Blocked;
			else if (__s == null)
				throw Custom(e);
			else
				throw new haxe.io.Eof();
		}
	}

	public override function readBytes(buf:haxe.io.Bytes, pos:Int, len:Int):Int {
		var r;
		try {
			r = socket_recv(__s, buf.getData(), pos, len);
		} catch (e:Dynamic) {
			if (e == "Blocking")
				throw Blocked;
			else
				throw Custom(e);
		}
		if (r == 0)
			throw new haxe.io.Eof();
		return r;
	}

	public override function close() {
		super.close();
		if (__s != null)
			socket_close(__s);
	}

	private static var socket_recv = neko.Lib.load("std", "socket_recv", 4);
	private static var socket_recv_char = neko.Lib.load("std", "socket_recv_char", 1);
	private static var socket_close = neko.Lib.load("std", "socket_close", 1);
}

@:coreApi
class Socket {
	private var __s:SocketHandle;

	public var input(default, null):haxe.io.Input;
	public var output(default, null):haxe.io.Output;
	public var custom:Dynamic;

	public function new():Void {
		init();
	}

	private function init():Void {
		if (__s == null)
			__s = socket_new(false);
		input = new SocketInput(__s);
		output = new SocketOutput(__s);
	}

	public function close():Void {
		socket_close(__s);
		untyped {
			input.__s = null;
			output.__s = null;
		}
		input.close();
		output.close();
	}

	public function read():String {
		return new String(socket_read(__s));
	}

	public function write(content:String):Void {
		socket_write(__s, untyped content.__s);
	}

	public function connect(host:Host, port:Int):Void {
		try {
			socket_connect(__s, host.ip, port);
		} catch (s:String) {
			if (s == "std@socket_connect")
				throw "Failed to connect on " + host.toString() + ":" + port;
			else if (s == "Blocking") {
				// Do nothing, this is not a real error, it simply indicates
				// that a non-blocking connect is in progress
			} else
				neko.Lib.rethrow(s);
		}
	}

	public function listen(connections:Int):Void {
		socket_listen(__s, connections);
	}

	public function shutdown(read:Bool, write:Bool):Void {
		socket_shutdown(__s, read, write);
	}

	public function bind(host:Host, port:Int):Void {
		socket_bind(__s, host.ip, port);
	}

	public function accept():Socket {
		var c = socket_accept(__s);
		var s = Type.createEmptyInstance(Socket);
		s.__s = c;
		s.input = new SocketInput(c);
		s.output = new SocketOutput(c);
		return s;
	}

	public function peer():{host:Host, port:Int} {
		var a:Dynamic = socket_peer(__s);
		if (a == null) {
			return null;
		}
		var h = new Host("127.0.0.1");
		untyped h.ip = a[0];
		return {host: h, port: a[1]};
	}

	public function host():{host:Host, port:Int} {
		var a:Dynamic = socket_host(__s);
		if (a == null) {
			return null;
		}
		var h = new Host("127.0.0.1");
		untyped h.ip = a[0];
		return {host: h, port: a[1]};
	}

	public function setTimeout(timeout:Float):Void {
		socket_set_timeout(__s, timeout);
	}

	public function waitForRead():Void {
		select([this], null, null, null);
	}

	public function setBlocking(b:Bool):Void {
		socket_set_blocking(__s, b);
	}

	public function setFastSend(b:Bool):Void {
		socket_set_fast_send(__s, b);
	}

	public static function select(read:Array<Socket>, write:Array<Socket>, others:Array<Socket>,
			?timeout:Float):{read:Array<Socket>, write:Array<Socket>, others:Array<Socket>} {
		var c = untyped __dollar__hnew(1);
		var f = function(a:Array<Socket>) {
			if (a == null)
				return null;
			untyped {
				var r = __dollar__amake(a.length);
				var i = 0;
				while (i < a.length) {
					r[i] = a[i].__s;
					__dollar__hadd(c, a[i].__s, a[i]);
					i += 1;
				}
				return r;
			}
		}
		var neko_array = socket_select(f(read), f(write), f(others), timeout);

		var g = function(a):Array<Socket> {
			if (a == null)
				return null;

			var r = new Array();
			var i = 0;
			while (i < untyped __dollar__asize(a)) {
				var t = untyped __dollar__hget(c, a[i], null);
				if (t == null)
					throw "Socket object not found.";
				r[i] = t;
				i += 1;
			}
			return r;
		}

		return {
			read: g(neko_array[0]),
			write: g(neko_array[1]),
			others: g(neko_array[2])
		};
	}

	private static var socket_new = neko.Lib.load("std", "socket_new", 1);
	private static var socket_close = neko.Lib.load("std", "socket_close", 1);
	private static var socket_write = neko.Lib.load("std", "socket_write", 2);
	private static var socket_read = neko.Lib.load("std", "socket_read", 1);
	private static var socket_connect = neko.Lib.load("std", "socket_connect", 3);
	private static var socket_listen = neko.Lib.load("std", "socket_listen", 2);
	private static var socket_select = neko.Lib.load("std", "socket_select", 4);
	private static var socket_bind = neko.Lib.load("std", "socket_bind", 3);
	private static var socket_accept = neko.Lib.load("std", "socket_accept", 1);
	private static var socket_peer = neko.Lib.load("std", "socket_peer", 1);
	private static var socket_host = neko.Lib.load("std", "socket_host", 1);
	private static var socket_set_timeout = neko.Lib.load("std", "socket_set_timeout", 2);
	private static var socket_shutdown = neko.Lib.load("std", "socket_shutdown", 3);
	private static var socket_set_blocking = neko.Lib.load("std", "socket_set_blocking", 2);
	private static var socket_set_fast_send = neko.Lib.loadLazy("std", "socket_set_fast_send", 2);
}