/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016, 2017 Mattias Andrée (maandree@kth.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MDS_MDS_COLOUR_H
#define MDS_MDS_COLOUR_H
#include "mds-base.h"
#include <libmdsserver/hash-list.h>
#include <stdint.h>
/**
* Data structure for colour
*/
typedef struct colour {
/**
* The value of the red channel
*/
uint64_t red;
/**
* The value of the green channel
*/
uint64_t green;
/**
* The value of the blue channel
*/
uint64_t blue;
/**
* The number of bytes with which
* each channel is encoded
*/
int bytes;
} colour_t;
/**
* Handle the received message
*
* @return Zero on success, -1 on error
*/
int handle_message(void);
/**
* Handle the received message after it has been
* identified to contain `Command: list-colours`
*
* @param recv_client_id The value of the `Client ID`-header, "0:0" if omitted
* @param recv_message_id The value of the `Message ID`-header
* @param recv_include_values The value of the `Include values`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_list_colours(const char *recv_client_id, const char *recv_message_id,
const char *recv_include_values);
/**
* Handle the received message after it has been
* identified to contain `Command: get-colour`
*
* @param recv_client_id The value of the `Client ID`-header, "0:0" if omitted
* @param recv_message_id The value of the `Message ID`-header
* @param recv_name The value of the `Name`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_get_colour(const char *recv_client_id, const char *recv_message_id, const char *recv_name);
/**
* Handle the received message after it has been
* identified to contain `Command: set-colour`
*
* @param recv_name The value of the `Name`-header, `NULL` if omitted
* @param recv_remove The value of the `Remove`-header, `NULL` if omitted
* @param recv_bytes The value of the `Bytes`-header, `NULL` if omitted
* @param recv_red The value of the `Red`-header, `NULL` if omitted
* @param recv_green The value of the `Green`-header, `NULL` if omitted
* @param recv_blue The value of the `Blue`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_set_colour(const char *recv_name, const char *recv_remove, const char *recv_bytes,
const char *recv_red, const char *recv_green, const char *recv_blue);
/**
* Add, remove or modify a colour
*
* @param name The name of the colour, must not be `NULL`
* @param colour The colour, `NULL` to remove
* @return Zero on success, -1 on error, removal of
* non-existent colour does not constitute an error
*/
__attribute__((nonnull(1)))
int set_colour(const char *name, const colour_t *colour);
/**
* Broadcast a colour list update event
*
* @param event The event, that is, the value for the `Command`-header, must not be `NULL`
* @param name The name of the colour, must not be `NULL`
* @param colour The new colour, `NULL` if and only if removed
* @param last_update The value on the `Last update`-header
* @return Zero on success, -1 on error
*/
__attribute__((nonnull(1, 2, 4)))
int broadcast_update(const char *event, const char *name, const colour_t *colour,
const char *last_update);
CREATE_HASH_LIST_SUBCLASS(colour_list, char *restrict, const char *restrict, colour_t)
/**
* Free the key and value of an entry in a colour list
*
* @param entry The entry
*/
void colour_list_entry_free(colour_list_entry_t *entry);
#endif
