/**************************************************************************/
/*  remote_debugger_peer.h                                                */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* 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,        */
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/**************************************************************************/

#pragma once

#include "core/object/ref_counted.h"
#include "core/os/mutex.h"
#include "core/os/thread.h"
#include "core/string/ustring.h"

class StreamPeerSocket;

class RemoteDebuggerPeer : public RefCounted {
	GDSOFTCLASS(RemoteDebuggerPeer, RefCounted);

protected:
	int max_queued_messages = 4096;

public:
	virtual bool is_peer_connected() = 0;
	virtual int get_max_message_size() const = 0;
	virtual bool has_message() = 0;
	virtual Error put_message(const Array &p_arr) = 0;
	virtual Array get_message() = 0;
	virtual void close() = 0;
	virtual void poll() = 0;
	virtual bool can_block() const { return true; } // If blocking io is allowed on main thread (debug).

	RemoteDebuggerPeer();
};

class RemoteDebuggerPeerTCP : public RemoteDebuggerPeer {
	GDSOFTCLASS(RemoteDebuggerPeerTCP, RemoteDebuggerPeer);

private:
	Ref<StreamPeerSocket> tcp_client;
	Mutex mutex;
	Thread thread;
	List<Array> in_queue;
	List<Array> out_queue;
	int out_left = 0;
	int out_pos = 0;
	Vector<uint8_t> out_buf;
	int in_left = 0;
	int in_pos = 0;
	Vector<uint8_t> in_buf;
	bool connected = false;
	bool running = false;

	static void _thread_func(void *p_ud);

	void _poll();
	void _write_out();
	void _read_in();
	void _disconnect_with_error(const String &p_reason);
	static Error _try_connect(Ref<StreamPeerSocket> p_stream);

public:
	static Ref<RemoteDebuggerPeer> create_tcp(const String &p_uri);
	static Ref<RemoteDebuggerPeer> create_unix(const String &p_uri);

	bool is_peer_connected() override;
	int get_max_message_size() const override;
	bool has_message() override;
	Error put_message(const Array &p_arr) override;
	Array get_message() override;
	void poll() override;
	void close() override;

	RemoteDebuggerPeerTCP(Ref<StreamPeerSocket> p_stream);
	RemoteDebuggerPeerTCP();
	~RemoteDebuggerPeerTCP();
};
