/*
 * Hot Beverage Companion – indicator module
 *
 * Copyright (C) 2018 Gediminas Jakutis
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; version 2.1
 * of the License.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "indicator.h"

#define HIGH 1
#define LOW 0
#define OUTPUT 1

struct indicator {
	unsigned int red;
	unsigned int green;
	unsigned int blue;
	unsigned int current_temp;
	unsigned int calibration[4];
};

static struct indicator state;
static const unsigned int redled = 5;	/* D1 */
static const unsigned int greenled = 4;	/* D2 */
static const unsigned int blueled = 14;	/* D5 */

static void indicator_set_state(unsigned int red, unsigned int green, unsigned int blue);

void indicator_init(unsigned int temp, unsigned int const * const calibration)
{
	static const unsigned int default_calibration[] = {3430, 3330, 3230, 3130};

	pinMode(redled, OUTPUT);
	pinMode(greenled, OUTPUT);
	pinMode(blueled, OUTPUT);

	state.current_temp = temp;

	if (calibration) {
		indicator_calibrate(calibration);
	} else {
		indicator_calibrate(default_calibration);
	}

}

void indicator_update(const unsigned int temp, const unsigned int on)
{
	if (!on) {
		indicator_set_state(0, 0, 0);
		return;
	}

	if (temp > state.calibration[0]) {
		indicator_set_state(1, 0, 0);
	} else if (temp > state.calibration[1]) {
		indicator_set_state(1, 1, 0);
	} else if (temp >= state.calibration[2]) {
		indicator_set_state(0, 1, 0);
	} else if (temp >= state.calibration[3]) {
		indicator_set_state(0, 1, 1);
	} else if (temp < state.calibration[3]) {
		indicator_set_state(0, 0, 1);
	}
}

void indicator_calibrate(unsigned int const * const calibration)
{
	memcpy(state.calibration, calibration, sizeof(state.calibration));
	indicator_update(state.current_temp, 1);
}

static void indicator_set_state(unsigned int red, unsigned int green, unsigned int blue)
{
	if (red != state.red) {
		if (red) {
			digitalWrite(redled, HIGH);
		} else {
			digitalWrite(redled, LOW);
		}
		state.red = red;
	}

	if (green != state.green) {
		if (green) {
			digitalWrite(greenled, HIGH);
		} else {
			digitalWrite(greenled, LOW);
		}
		state.green = green;
	}

	if (blue != state.blue) {
		if (blue) {
			digitalWrite(blueled, HIGH);
		} else {
			digitalWrite(blueled, LOW);
		}
		state.blue = blue;
	}
}