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/* binwatch.c */
/* binwatch - Tiny binary wristwatch. {{{
 *
 * Copyright (C) 2010 Nicolas Schodet
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Contact :
 *        Web: http://ni.fr.eu.org/
 *      Email: <nico at ni.fr.eu.org>
 * }}} */
#include "io.h"
#include "common/led.h"
#include "common/rtc.h"
#include "common/button.h"
#include "common/power.h"

#define BINWATCH_TIME_DISPLAY_DUR (3 * LED_1S)
#define BINWATCH_ANIM_SPEED (LED_100MS / 2)
#define BINWATCH_UI_SPEED (LED_1S / 2)

#define BINWATCH_SET_TIME_STEPS 3

/** Format time in leds format. */
static uint16_t
binwatch_format_time (uint8_t hour, uint8_t minute)
{
    hour = hour % 12;
    if (hour == 0)
	hour = 12;
    return hour << 6 | minute;
}

/** Get time in leds format. */
static uint16_t
binwatch_get_time (void)
{
    uint8_t hour, minute, second;
    rtc_get_time (&hour, &minute, &second);
    return binwatch_format_time (hour, minute);
}

/** User interface to get an integer between a and b (included). */
static uint16_t
binwatch_get_int_ui (uint16_t a, uint16_t b, uint16_t step, uint16_t always_on)
{
    uint16_t input = a;
    while (1)
      {
	led_display (input | always_on, BINWATCH_UI_SPEED);
	if (button_pressed ())
	  {
	    /* If button is pressed, user selected this integer. */
	    button_wait ();
	    return input;
	  }
	else
	  {
	    /* Else, propose the next integer. */
	    input += step;
	    if (input > b)
		input = a;
	  }
      }
}

/** User interface to set current time. */
static void
binwatch_set_time_ui (void)
{
    /* Input hour and minutes. */
    uint8_t hour = binwatch_get_int_ui (0, 23, 1, 0x200);
    uint8_t minute = binwatch_get_int_ui (0, 59, 1, 0x100);
    /* Display entered time and wait button press. */
    uint16_t time = binwatch_format_time (hour, minute);
    led_display (time, BINWATCH_TIME_DISPLAY_DUR);
    button_wait ();
    /* Now change time in RTC. */
    rtc_stop ();
    rtc_set_time (hour, minute, 0);
    rtc_go ();
    /* Display time to acknowledge. */
    led_display (time, BINWATCH_TIME_DISPLAY_DUR);
}

int
main (void)
{
    /* Initialise hardware. */
    power_init ();
    led_init ();
    button_init ();
    /* Initialise RTC. */
    uint8_t init;
    init = rtc_init ();
    if (!init)
      {
	/* Initialisation failed, blink! */
	while (1)
	  {
	    led_display (0x3f, LED_100MS);
	    led_display (0, 9 * LED_100MS);
	    /* Sleep, do not eat all battery. */
	    button_wait ();
	  }
      }
    else
      {
	/* Initialisation ok, display current time. */
	uint16_t time;
	time = binwatch_get_time ();
	led_display (time, BINWATCH_TIME_DISPLAY_DUR);
	/* If low voltage detected, wait user press to let clock go. */
	if (init == RTC_LOW_VOLTAGE)
	  {
	    button_wait ();
	    rtc_go ();
	    led_display (time, BINWATCH_TIME_DISPLAY_DUR);
	  }
	/* Wait user press to display time. */
	uint8_t set_time_step = 0;
	while (1)
	  {
	    uint16_t press_ms = button_wait ();
	    if (press_ms < 5000)
	      {
		/* Short press, display time. */
		time = binwatch_get_time ();
		led_animate (time, LED_ANIMATION_TRACE_CCW,
			     BINWATCH_ANIM_SPEED);
		led_display (time, BINWATCH_TIME_DISPLAY_DUR);
		set_time_step = 0;
	      }
	    else if (press_ms < 10000)
	      {
		/* Long press, if done several time in a row, set time.
		 * This is done to avoid unwanted set time. */
		set_time_step++;
		if (set_time_step >= BINWATCH_SET_TIME_STEPS)
		  {
		    binwatch_set_time_ui ();
		    set_time_step = 0;
		  }
		else
		    led_display (0x3c0, BINWATCH_UI_SPEED);
	      }
	    else
	      {
		/* Very long press, must be unintended. */
		set_time_step = 0;
	      }
	  }
      }
}