/*-
 * redshift-ng - Automatically adjust display colour temperature according the Sun
 * 
 * Copyright (c) 2009-2018        Jon Lund Steffensen <jonlst@gmail.com>
 * Copyright (c) 2014-2016, 2025  Mattias Andrée <m@maandree.se>
 * 
 * redshift-ng 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-ng 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-ng.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "common.h"


struct location_state {
	/**
	 * The specified location, any unspecified coordinate is set to NAN
	 */
	struct location location;
};


static int
manual_create(struct location_state **state_out)
{
	*state_out = emalloc(sizeof(**state_out));
	(*state_out)->location.latitude = FNAN;
	(*state_out)->location.longitude = FNAN;
	return 0;
}


GCC_ONLY(__attribute__((__pure__)))
static int
manual_start(struct location_state *state)
{
	if (isnan(state->location.latitude) || isnan(state->location.longitude))
		eprintf(_("Latitude and longitude must be set."));
	return 0;
}


static void
manual_free(struct location_state *state)
{
	free(state);
}


static void
manual_print_help(void)
{
	printf(_("Specify location manually.\n"));
	printf("\n");

	/* TRANSLATORS: "N" represents "cardinal"; right-pad with spaces to preserve display width */
	printf("  lat=%s    %s\n", _("N     "), _("Latitude"));
	printf("  lon=%s    %s\n", _("N     "), _("Longitude"));
	printf("\n");

	printf(_("Both values are expected to be floating point numbers,\n"
	         "negative values representing west / south, respectively.\n"));
	printf("\n");
}


static int
manual_set_option(struct location_state *state, const char *key, const char *value)
{
	char *end;
	double v;

	errno = 0;
	v = strtod(value, &end);
	if (errno || *end) {
		weprintf(_("Malformed argument."));
		return -1;
	}

	if (!strcasecmp(key, "lat")) {
		state->location.latitude = v;
	} else if (!strcasecmp(key, "lon")) {
		state->location.longitude = v;
	} else {
		weprintf(_("Unknown provider parameter: `%s'."), key);
		return -1;
	}

	return 0;
}


static int
manual_get_fd(struct location_state *state)
{
	(void) state;
	return -1;
}


static int
manual_fetch(struct location_state *state, struct location *location_out, int *available_out)
{
	*location_out = state->location;
	*available_out = 1;
	return 0;
}


const struct location_provider manual_location_provider = LOCATION_PROVIDER_INIT("manual", manual);