/*
 * 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;

#if doc_gen
@:noDoc enum SocketHandle {}
#else
@:noDoc typedef SocketHandle = hl.Abstract<"hl_socket">;
#end

private class SocketOutput extends haxe.io.Output {
	var sock:Socket;

	public function new(s) {
		this.sock = s;
	}

	public override function writeByte(c:Int) {
		var k = socket_send_char(@:privateAccess sock.__s, c);
		if (k < 0) {
			if (k == -1)
				throw Blocked;
			throw new haxe.io.Eof();
		}
	}

	public override function writeBytes(buf:haxe.io.Bytes, pos:Int, len:Int):Int {
		if (pos < 0 || len < 0 || pos + len > buf.length)
			throw haxe.io.Error.OutsideBounds;
		var n = socket_send(@:privateAccess sock.__s, buf.getData().bytes, pos, len);
		if (n < 0) {
			if (n == -1)
				throw Blocked;
			throw new haxe.io.Eof();
		}
		return n;
	}

	public override function close() {
		sock.close();
	}

	@:hlNative("std", "socket_send_char") static function socket_send_char(s:SocketHandle, c:Int):Int {
		return 0;
	}

	@:hlNative("std", "socket_send") static function socket_send(s:SocketHandle, bytes:hl.Bytes, pos:Int, len:Int):Int {
		return 0;
	}
}

private class SocketInput extends haxe.io.Input {
	var sock:Socket;

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

	public override function readByte():Int {
		var c = socket_recv_char(@:privateAccess sock.__s);
		if (c < 0) {
			if (c == -1)
				throw Blocked;
			throw new haxe.io.Eof();
		}
		return c;
	}

	public override function readBytes(buf:haxe.io.Bytes, pos:Int, len:Int):Int {
		if (pos < 0 || len < 0 || pos + len > buf.length)
			throw haxe.io.Error.OutsideBounds;
		var r = socket_recv(@:privateAccess sock.__s, buf.getData().bytes, pos, len);
		if (r <= 0) {
			if (r == -1)
				throw Blocked;
			throw new haxe.io.Eof();
		}
		return r;
	}

	public override function close() {
		sock.close();
	}

	@:hlNative("std", "socket_recv") static function socket_recv(s:SocketHandle, bytes:hl.Bytes, pos:Int, len:Int):Int {
		return 0;
	}

	@:hlNative("std", "socket_recv_char") static function socket_recv_char(s:SocketHandle):Int {
		return 0;
	}
}

@:coreApi
@:keepInit
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;

	static function __init__():Void {
		socket_init();
	}

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

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

	public function close():Void {
		if (__s != null) {
			socket_close(__s);
			__s = null;
		}
	}

	public function read():String {
		return input.readAll().toString();
	}

	public function write(content:String):Void {
		output.writeString(content);
	}

	public function connect(host:Host, port:Int):Void {
		if (!socket_connect(__s, host.ip, port))
			throw new Sys.SysError("Failed to connect on " + host.toString() + ":" + port);
	}

	public function listen(connections:Int):Void {
		if (!socket_listen(__s, connections))
			throw new Sys.SysError("listen() failure");
	}

	public function shutdown(read:Bool, write:Bool):Void {
		if (!socket_shutdown(__s, read, write))
			throw new Sys.SysError("shutdown() failure");
	}

	public function bind(host:Host, port:Int):Void {
		if (!socket_bind(__s, host.ip, port))
			throw new Sys.SysError("Cannot bind socket on " + host + ":" + port);
	}

	public function accept():Socket {
		var c = socket_accept(__s);
		if (c == null)
			return null;
		var s:Socket = untyped $new(Socket);
		s.__s = c;
		s.input = new SocketInput(s);
		s.output = new SocketOutput(s);
		return s;
	}

	public function peer():{host:Host, port:Int} {
		var ip = 0, port = 0;
		if (!socket_peer(__s, ip, port))
			return null;
		var h:Host = untyped $new(Host);
		@:privateAccess h.ip = ip;
		return {host: h, port: port};
	}

	public function host():{host:Host, port:Int} {
		var ip = 0, port = 0;
		if (!socket_host(__s, ip, port))
			return null;
		var h:Host = untyped $new(Host);
		@:privateAccess h.ip = ip;
		return {host: h, port: port};
	}

	public function setTimeout(timeout:Float):Void {
		if (!socket_set_timeout(__s, timeout))
			throw new Sys.SysError("setTimeout() failure");
	}

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

	public function setBlocking(b:Bool):Void {
		if (!socket_set_blocking(__s, b))
			throw new Sys.SysError("setBlocking() failure");
	}

	public function setFastSend(b:Bool):Void {
		if (!socket_set_fast_send(__s, b))
			throw new Sys.SysError("setFastSend() failure");
	}

	// TODO : use TLS when multithread added
	static var tmp:hl.Bytes = null;
	static var curTmpSize = 0;

	static function makeArray(a:Array<Socket>):hl.NativeArray<SocketHandle> {
		if (a == null)
			return null;
		var arr = new hl.NativeArray(a.length);
		for (i in 0...a.length)
			arr[i] = a[i].__s;
		return arr;
	}

	static function outArray(a:hl.NativeArray<SocketHandle>, original:Array<Socket>):Array<Socket> {
		var out = [];
		if (a == null)
			return out;
		var i = 0, p = 0;
		var max = original.length;
		while (i < max) {
			var sh = a[i++];
			if (sh == null)
				break;
			while (original[p].__s != sh)
				p++;
			out.push(original[p++]);
		}
		return out;
	}

	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 sread = makeArray(read);
		var swrite = makeArray(write);
		var sothers = makeArray(others);
		var tmpSize = 0;
		if (sread != null)
			tmpSize += socket_fd_size(sread.length);
		if (swrite != null)
			tmpSize += socket_fd_size(swrite.length);
		if (sothers != null)
			tmpSize += socket_fd_size(sothers.length);
		if (tmpSize > curTmpSize) {
			tmp = new hl.Bytes(tmpSize);
			curTmpSize = tmpSize;
		}
		if (!socket_select(sread, swrite, sothers, tmp, curTmpSize, timeout == null ? -1 : timeout))
			throw "Error while waiting on socket";
		return {
			read: outArray(sread, read),
			write: outArray(swrite, write),
			others: outArray(sothers, others),
		};
	}

	@:hlNative("std", "socket_init") static function socket_init():Void {}

	@:hlNative("std", "socket_new") static function socket_new(udp:Bool):SocketHandle {
		return null;
	}

	@:hlNative("std", "socket_close") static function socket_close(s:SocketHandle):Void {}

	@:hlNative("std", "socket_connect") static function socket_connect(s:SocketHandle, host:Int, port:Int):Bool {
		return true;
	}

	@:hlNative("std", "socket_listen") static function socket_listen(s:SocketHandle, count:Int):Bool {
		return true;
	}

	@:hlNative("std", "socket_bind") static function socket_bind(s:SocketHandle, host:Int, port:Int):Bool {
		return true;
	}

	@:hlNative("std", "socket_accept") static function socket_accept(s:SocketHandle):SocketHandle {
		return null;
	}

	@:hlNative("std", "socket_peer") static function socket_peer(s:SocketHandle, host:hl.Ref<Int>, port:hl.Ref<Int>):Bool {
		return true;
	}

	@:hlNative("std", "socket_host") static function socket_host(s:SocketHandle, host:hl.Ref<Int>, port:hl.Ref<Int>):Bool {
		return true;
	}

	@:hlNative("std", "socket_set_timeout") static function socket_set_timeout(s:SocketHandle, timeout:Float):Bool {
		return true;
	}

	@:hlNative("std", "socket_shutdown") static function socket_shutdown(s:SocketHandle, read:Bool, write:Bool):Bool {
		return true;
	}

	@:hlNative("std", "socket_set_blocking") static function socket_set_blocking(s:SocketHandle, b:Bool):Bool {
		return true;
	}

	@:hlNative("std", "socket_set_fast_send") static function socket_set_fast_send(s:SocketHandle, b:Bool):Bool {
		return true;
	}

	@:hlNative("std", "socket_fd_size") static function socket_fd_size(count:Int):Int {
		return 0;
	}

	@:hlNative("std", "socket_select") static function socket_select(read:hl.NativeArray<SocketHandle>, write:hl.NativeArray<SocketHandle>,
			other:hl.NativeArray<SocketHandle>, tmpData:hl.Bytes, tmpSize:Int, timeout:Float):Bool {
		return false;
	}
}