/* redshift.h -- Main program header
   This file is part of Redshift.

   Redshift 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.

   Redshift 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 Redshift.  If not, see <http://www.gnu.org/licenses/>.

   Copyright (c) 2013-2014  Jon Lund Steffensen <jonlst@gmail.com>
*/

#ifndef REDSHIFT_REDSHIFT_H
#define REDSHIFT_REDSHIFT_H

#include <stdio.h>
#include <stdlib.h>


/* Location */
typedef struct {
	float lat;
	float lon;
} location_t;

/* Periods of day. */
typedef enum {
	PERIOD_NONE = 0,
	PERIOD_DAYTIME,
	PERIOD_NIGHT,
	PERIOD_TRANSITION
} period_t;

/* Color setting */
typedef struct {
	int temperature;
	float gamma[3];
	float brightness;
} color_setting_t;


/* Gamma adjustment method */
typedef int gamma_method_init_func(void *state);
typedef int gamma_method_start_func(void *state);
typedef void gamma_method_free_func(void *state);
typedef void gamma_method_print_help_func(FILE *f);
typedef int gamma_method_set_option_func(void *state, const char *key,
					 const char *value);
typedef void gamma_method_restore_func(void *state);
typedef int gamma_method_set_temperature_func(void *state,
					      const color_setting_t *setting);

typedef struct {
	char *name;

	/* If true, this method will be tried if none is explicitly chosen. */
	int autostart;

	/* Initialize state. Options can be set between init and start. */
	gamma_method_init_func *init;
	/* Allocate storage and make connections that depend on options. */
	gamma_method_start_func *start;
	/* Free all allocated storage and close connections. */
	gamma_method_free_func *free;

	/* Print help on options for this adjustment method. */
	gamma_method_print_help_func *print_help;
	/* Set an option key, value-pair */
	gamma_method_set_option_func *set_option;

	/* Restore the adjustment to the state before start was called. */
	gamma_method_restore_func *restore;
	/* Set a specific color temperature. */
	gamma_method_set_temperature_func *set_temperature;
} gamma_method_t;


/* Location provider */
typedef int location_provider_init_func(void *state);
typedef int location_provider_start_func(void *state);
typedef void location_provider_free_func(void *state);
typedef void location_provider_print_help_func(FILE *f);
typedef int location_provider_set_option_func(void *state, const char *key,
					      const char *value);
typedef int location_provider_get_location_func(void *state, location_t *loc);

typedef struct {
	char *name;

	/* Initialize state. Options can be set between init and start. */
	location_provider_init_func *init;
	/* Allocate storage and make connections that depend on options. */
	location_provider_start_func *start;
	/* Free all allocated storage and close connections. */
	location_provider_free_func *free;

	/* Print help on options for this location provider. */
	location_provider_print_help_func *print_help;
	/* Set an option key, value-pair. */
	location_provider_set_option_func *set_option;

	/* Get current location. */
	location_provider_get_location_func *get_location;
} location_provider_t;


#endif /* ! REDSHIFT_REDSHIFT_H */