/* See LICENSE file for copyright and license details. */
#ifndef STATE_H
#define STATE_H

#include "types-message.h"
#include "types-ring.h"
#include "types-output.h"

#include <stddef.h>
#include <signal.h>

#include <libgamma.h>

#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
#  define GCC_ONLY(...) __VA_ARGS__
# else
#  define GCC_ONLY(...) /* nothing */
# endif
#endif

/**
 * The name of the process
 */
extern char *restrict argv0;

/**
 * The real pathname of the process's binary,
 * `NULL` if `argv0` is satisfactory
 */
extern char *restrict argv0_real;

/**
 * Array of all outputs
 */
extern struct output *restrict outputs;

/**
 * The nubmer of elements in `outputs`
 */
extern size_t outputs_n;

/**
 * The server socket's file descriptor
 */
extern int socketfd;

/**
 * Has the process receive a signal
 * telling it to re-execute?
 */
extern volatile sig_atomic_t reexec;

/**
 * Has the process receive a signal
 * telling it to terminate?
 */
extern volatile sig_atomic_t terminate;

/**
 * Has the process receive a to
 * disconnect from or reconnect to
 * the site? 1 if disconnect, 2 if
 * reconnect, 0 otherwise.
 */
extern volatile sig_atomic_t connection;

/**
 * List of all client's file descriptors
 * 
 * Unused slots, with index less than `connections_used`,
 * should have the value -1 (negative)
 */
extern int *restrict connections;

/**
 * The number of elements allocated for `connections`
 */
extern size_t connections_alloc;

/**
 * The index of the first unused slot in `connections`
 */
extern size_t connections_ptr;

/**
 * The index of the last used slot in `connections`, plus 1
 */
extern size_t connections_used;

/**
 * The clients' connections' inbound-message buffers
 */
extern struct message *restrict inbound;

/**
 * The clients' connections' outbound-message buffers
 */
extern struct ring *restrict outbound;

/**
 * Is the server connect to the display?
 * 
 * Set to true before the initial connection
 */
extern int connected;

/**
 * The adjustment method, -1 for automatic
 */
extern int method;

/**
 * The site's name, may be `NULL`
 */
extern char *restrict sitename;

/**
 * The libgamma site state
 */
extern struct libgamma_site_state site;

/**
 * The libgamma partition states
 */
extern struct libgamma_partition_state *restrict partitions;

/**
 * The libgamma CRTC states
 */
extern struct libgamma_crtc_state *restrict crtcs;

/**
 * Preserve gamma ramps at priority 0?
 */
extern int preserve;

/**
 * Dump the state to stderr
 */
void state_dump(void);

/**
 * Destroy the state
 */
void state_destroy(void);

/**
 * Marshal the state
 * 
 * @param   buf  Output buffer for the marshalled data,
 *               `NULL` to only measure how many bytes
 *               this buffer needs
 * @return       The number of marshalled bytes
 */
size_t state_marshal(void *restrict buf);

/**
 * Unmarshal the state
 * 
 * @param   buf  Buffer for the marshalled data
 * @return       The number of unmarshalled bytes, 0 on error
 */
GCC_ONLY(__attribute__((__nonnull__)))
size_t state_unmarshal(const void *restrict buf);

#endif