#include "oswald.h"
#include "oswald_watch_faces.h"
#include "Fonts.h"
#include "LcdDisplay.h"

#include "oswald_main.h"

/*
 * some variable defining our curent state
 * these are globals in order to avoid having to pass pointers
 * through function calls thus saving stack space
 */
clock_state OswaldClk;
watch_state OswaldState;

void update_screen(void)
{
	if (OswaldState.user_screendraw_func != NULL)
		OswaldState.user_screendraw_func();
}

void oswald_change_to_screen(screen_number screen)
{
	// we spare the update if no change happened
	if (OswaldState.screen != screen) {
		OswaldState.screen = screen;
		update_screen();
	}
}

void oswald_set_time(u8t hour, u8t minute, u8t second)
{
	OswaldClk.hour = hour;
	OswaldClk.minute = minute;
	OswaldClk.second = second;
}

static void update_clock_state (void)
{
	OswaldClk.second += 1;
	if (OswaldClk.second > 59) {
		OswaldClk.second = 0;
		OswaldClk.minute += 1;
	} else
		return;
	if (OswaldClk.minute > 59) {
		OswaldClk.minute = 0;
		OswaldClk.hour += 1;
	} else
		return;
	if (OswaldClk.hour > 23) {
		OswaldClk.hour = 0;
		// day++
	} else
		return;
}

void oswald_one_second_tick(void)
{
	update_clock_state();
	update_screen();
}

void draw_accel_screen(void)
{
	lcd_clear_display();
	SetFont(MetaWatch16);
	WriteLcdString(2, 2, "X:");
	WriteLcdString(20, 2, "123");
	WriteLcdString(2, 18, "Z:");
	WriteLcdString(20, 18, "123");
	WriteLcdString(2, 34, "Y:");
	WriteLcdString(20, 34, "123");
}

void idle_handle_user_buttons(watch_button button)
{
}

void oswald_handle_button_press(watch_button button)
{
	switch (button) {
		case BUTTON_A:
		case BUTTON_B:
		case BUTTON_D:
		case BUTTON_E:
			if (OswaldState.user_button_func != NULL)
				OswaldState.user_button_func(button);
			break;
		case BUTTON_C:
			// next screen
			OswaldState.screen++;
			if (OswaldState.screen >= LAST_SCREEN) {
				OswaldState.screen = IDLE_SCREEN;
				OswaldState.user_button_func = idle_handle_user_buttons;
				OswaldState.user_screendraw_func = DrawLcdDigitalClock;
			} else {
				switch (OswaldState.screen) {
					case SETTING_DATETIME_SCREEN:
						OswaldState.user_button_func = idle_handle_user_buttons;
						OswaldState.user_screendraw_func = draw_accel_screen;
						break;
					default:
						break;
				};
			};
			update_screen();
			break;
		case BUTTON_F:
			// backlight on/off
			break;
		default:
			// should never get here
			break;
	};
}

void oswald_init(void)
{
	OswaldState.screen = IDLE_SCREEN;
	OswaldState.idle_show_seconds = FALSE;
	OswaldState.user_screendraw_func = DrawLcdDigitalClock;
	OswaldState.user_button_func = idle_handle_user_buttons;
}