/****************************************************************************
 *
 *   Copyright (c) 2014, 2020 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 ****************************************************************************/

#pragma once

/// @file mavlink_log_handler.h
/// @author px4dev, Gus Grubba <mavlink@grubba.com>

#include <dirent.h>
#include <queue.h>
#include <time.h>
#include <stdio.h>
#include <cstdbool>
#include <v2.0/mavlink_types.h>
#include <drivers/drv_hrt.h>

class Mavlink;

// MAVLink LOG_* Message Handler
class MavlinkLogHandler
{
public:
	MavlinkLogHandler(Mavlink *mavlink);
	~MavlinkLogHandler();

	// Handle possible LOG message
	void handle_message(const mavlink_message_t *msg);

	/**
	 * Handle sending of messages. Call this regularly at a fixed frequency.
	 * @param t current time
	 */
	void send();

	unsigned get_size();

private:
	enum class LogHandlerState {
		Inactive,     //There is no active action of log handler
		Idle,         //The log handler is not sending list/data, but list has been sent
		Listing,      //File list is being send
		SendingData  //File Data is being send
	};
	void _log_message(const mavlink_message_t *msg);
	void _log_request_list(const mavlink_message_t *msg);
	void _log_request_data(const mavlink_message_t *msg);
	void _log_request_erase(const mavlink_message_t *msg);
	void _log_request_end(const mavlink_message_t *msg);

	void _reset_list_helper();
	void _init_list_helper();
	bool _get_session_date(const char *path, const char *dir, time_t &date);
	void _scan_logs(FILE *f, const char *dir, time_t &date);
	bool _get_log_time_size(const char *path, const char *file, time_t &date, uint32_t &size);
	static void _delete_all(const char *dir);
	bool _get_entry(int idx, uint32_t &size, uint32_t &date, char *filename = 0, int filename_len = 0);
	bool _open_for_transmit();
	size_t _get_log_data(uint8_t len, uint8_t *buffer);
	void _close_and_unlink_files();

	size_t _log_send_listing();
	size_t _log_send_data();

	LogHandlerState _current_status{LogHandlerState::Inactive};
	Mavlink *_mavlink;

	int         _next_entry{0};
	int         _last_entry{0};
	int         _log_count{0};

	uint16_t    _current_log_index{UINT16_MAX};
	uint32_t    _current_log_size{0};
	uint32_t    _current_log_data_offset{0};
	uint32_t    _current_log_data_remaining{0};
	FILE       *_current_log_filep{nullptr};
	char        _current_log_filename[128]; //TODO: consider to allocate on runtime
};