/*************************************************************************/
/*  websocket_multiplayer_peer.h                                         */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef WEBSOCKET_MULTIPLAYER_PEER_H
#define WEBSOCKET_MULTIPLAYER_PEER_H

#include "core/error/error_list.h"
#include "core/io/multiplayer_peer.h"
#include "core/templates/list.h"
#include "websocket_peer.h"

class WebSocketMultiplayerPeer : public MultiplayerPeer {
	GDCLASS(WebSocketMultiplayerPeer, MultiplayerPeer);

private:
	Vector<uint8_t> _make_pkt(uint8_t p_type, int32_t p_from, int32_t p_to, const uint8_t *p_data, uint32_t p_data_size);
	void _store_pkt(int32_t p_source, int32_t p_dest, const uint8_t *p_data, uint32_t p_data_size);
	Error _server_relay(int32_t p_from, int32_t p_to, const uint8_t *p_buffer, uint32_t p_buffer_size);

protected:
	enum {
		SYS_NONE = 0,
		SYS_ADD = 1,
		SYS_DEL = 2,
		SYS_ID = 3,

		PROTO_SIZE = 9
	};

	struct Packet {
		int source = 0;
		int destination = 0;
		uint8_t *data = nullptr;
		uint32_t size = 0;
	};

	List<Packet> _incoming_packets;
	Map<int, Ref<WebSocketPeer>> _peer_map;
	Packet _current_packet;

	bool _is_multiplayer = false;
	int _target_peer = 0;
	int _peer_id = 0;
	int _refusing = false;

	static void _bind_methods();

	void _send_add(int32_t p_peer_id);
	void _send_sys(Ref<WebSocketPeer> p_peer, uint8_t p_type, int32_t p_peer_id);
	void _send_del(int32_t p_peer_id);
	int _gen_unique_id() const;

public:
	/* MultiplayerPeer */
	void set_transfer_mode(TransferMode p_mode) override;
	TransferMode get_transfer_mode() const override;
	void set_target_peer(int p_target_peer) override;
	int get_packet_peer() const override;
	int get_unique_id() const override;
	void set_refuse_new_connections(bool p_enable) override;
	bool is_refusing_new_connections() const override;

	/* PacketPeer */
	virtual int get_available_packet_count() const override;
	virtual Error get_packet(const uint8_t **r_buffer, int &r_buffer_size) override;
	virtual Error put_packet(const uint8_t *p_buffer, int p_buffer_size) override;

	/* WebSocketPeer */
	virtual Error set_buffers(int p_in_buffer, int p_in_packets, int p_out_buffer, int p_out_packets) = 0;
	virtual Ref<WebSocketPeer> get_peer(int p_peer_id) const = 0;

	void _process_multiplayer(Ref<WebSocketPeer> p_peer, uint32_t p_peer_id);
	void _clear();

	WebSocketMultiplayerPeer();
	~WebSocketMultiplayerPeer();
};

#endif // WEBSOCKET_MULTIPLAYER_PEER_H