/*************************************************************************/
/*  debug_adapter_protocol.h                                             */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef DEBUG_ADAPTER_PROTOCOL_H
#define DEBUG_ADAPTER_PROTOCOL_H

#include "core/io/stream_peer.h"
#include "core/io/stream_peer_tcp.h"
#include "core/io/tcp_server.h"

#include "debug_adapter_parser.h"
#include "debug_adapter_types.h"

#define DAP_MAX_BUFFER_SIZE 4194304 // 4MB
#define DAP_MAX_CLIENTS 8

class DebugAdapterParser;

struct DAPeer : RefCounted {
	Ref<StreamPeerTCP> connection;

	uint8_t req_buf[DAP_MAX_BUFFER_SIZE];
	int req_pos = 0;
	bool has_header = false;
	int content_length = 0;
	List<Dictionary> res_queue;
	int seq = 0;
	uint64_t timestamp = 0;

	// Client specific info
	bool linesStartAt1 = false;
	bool columnsStartAt1 = false;
	bool supportsVariableType = false;
	bool supportsInvalidatedEvent = false;
	bool supportsCustomData = false;

	// Internal client info
	bool attached = false;

	Error handle_data();
	Error send_data();
	String format_output(const Dictionary &p_params) const;
};

class DebugAdapterProtocol : public Object {
	GDCLASS(DebugAdapterProtocol, Object)

	friend class DebugAdapterParser;

private:
	static DebugAdapterProtocol *singleton;
	DebugAdapterParser *parser = nullptr;

	List<Ref<DAPeer>> clients;
	Ref<TCPServer> server;

	Error on_client_connected();
	void on_client_disconnected(const Ref<DAPeer> &p_peer);
	void on_debug_paused();
	void on_debug_stopped();
	void on_debug_output(const String &p_message);
	void on_debug_breaked(const bool &p_reallydid, const bool &p_can_debug, const String &p_reason, const bool &p_has_stackdump);
	void on_debug_breakpoint_toggled(const String &p_path, const int &p_line, const bool &p_enabled);
	void on_debug_stack_dump(const Array &p_stack_dump);
	void on_debug_stack_frame_vars(const int &p_size);
	void on_debug_stack_frame_var(const Array &p_data);
	void on_debug_data(const String &p_msg, const Array &p_data);

	void reset_current_info();
	void reset_ids();
	void reset_stack_info();

	int parse_variant(const Variant &p_var);

	bool _initialized = false;
	bool _processing_breakpoint = false;
	bool _stepping = false;
	bool _processing_stackdump = false;
	int _remaining_vars = 0;
	int _current_frame = 0;
	uint64_t _request_timeout = 1000;
	bool _sync_breakpoints = false;

	String _current_request;
	Ref<DAPeer> _current_peer;

	int breakpoint_id = 0;
	int stackframe_id = 0;
	int variable_id = 0;
	List<DAP::Breakpoint> breakpoint_list;
	HashMap<DAP::StackFrame, List<int>, DAP::StackFrame> stackframe_list;
	HashMap<int, Array> variable_list;

public:
	friend class DebugAdapterServer;

	_FORCE_INLINE_ static DebugAdapterProtocol *get_singleton() { return singleton; }
	_FORCE_INLINE_ bool is_active() const { return _initialized && clients.size() > 0; }

	bool process_message(const String &p_text);

	String get_current_request() const { return _current_request; }
	Ref<DAPeer> get_current_peer() const { return _current_peer; }

	void notify_initialized();
	void notify_process();
	void notify_terminated();
	void notify_exited(const int &p_exitcode = 0);
	void notify_stopped_paused();
	void notify_stopped_exception(const String &p_error);
	void notify_stopped_breakpoint(const int &p_id);
	void notify_stopped_step();
	void notify_continued();
	void notify_output(const String &p_message);
	void notify_custom_data(const String &p_msg, const Array &p_data);
	void notify_breakpoint(const DAP::Breakpoint &p_breakpoint, const bool &p_enabled);

	Array update_breakpoints(const String &p_path, const Array &p_lines);

	void poll();
	Error start(int p_port, const IPAddress &p_bind_ip);
	void stop();

	DebugAdapterProtocol();
	~DebugAdapterProtocol();
};

#endif // DEBUG_ADAPTER_PROTOCOL_H