#include <Arduino.h>
#include <U8g2lib.h>
#include <MUIU8g2.h>

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
MUIU8G2 mui;

/*
  global variables which form the communication gateway between the user interface and the rest of the code
*/
uint8_t hours = 2;       // variable where the user can input a number between 0 and 9
uint8_t minutes = 5;
uint8_t exit_code = 0;                  // return value from the menu system
char Svetlo_state[] = "On";

/* 
  MUIF table: Each entry defines a field, which can be used in FDS to describe a form.
*/


muif_t muif_list[] = {
  /* normal text style */
  MUIF_U8G2_FONT_STYLE(0, u8g2_font_helvR08_tr),
  
  /* Leave the menu system */
  MUIF_VARIABLE("LV",&exit_code,mui_u8g2_btn_exit_wm_fi),
  MUIF_VARIABLE("ID",&Svetlo_state,mui_u8g2_u8_opt_line_wa_mse_pi),
  /* input for a number between 0 to 9 */
  MUIF_U8G2_U8_MIN_MAX("IN", &hours, 0, 24, mui_u8g2_u8_min_max_wm_mse_pf),

  

  MUIF_U8G2_U8_MIN_MAX("MN", &minutes, 0, 59, mui_u8g2_u8_min_max_wm_mse_pf),
  
  /* MUI_LABEL is used to place fixed text on the screeen */
  MUIF_LABEL(mui_u8g2_draw_text)
};

/*
  The form definition string (fds) defines all forms and the fields on those forms.
  A new form always starts with MUI_FORM(u). The form ends with the next MUI_FORM() or the end of the fds.
  Inside the form use fields or the style command (MUI_STYLE)
  The fields are placed on the form with
    MUI_XY(id, x, y)                     Field 'id' without extra argument or text placed at the specified xy position
    MUI_XYT(id, x, y, text)            Field 'id' with the specified test at position xy
    MUI_XYA(id, x, y, a)                 Field 'id' with argument 'a' at position xy
    MUI_XYAT(id, x, y, a, text)         Field 'id' with argument and text placed at position xy
    MUI_LABEL(x, y, text)                 Place "text" on the form. Can be used only if "MUIF_LABEL(mui_u8g2_draw_text)" is available in MUIF table.

*/


fds_t fds_data[] MUI_PROGMEM = 
MUI_FORM(1)
MUI_STYLE(0)

MUI_LABEL(5, 10, "Svetlo:")
MUI_XYAT("ID", 60, 10, 10, "Banana|Apple|Melon|Cranberry")
MUI_STYLE(0)
MUI_LABEL(5,30, "Cas:")
MUI_XY("IN",60, 30)
MUI_XY("MN",80, 30)
MUI_XYT("LV",64, 59, " OK ")
;



uint8_t menu_select_pin = 4;
uint8_t menu_next_pin = 5;
uint8_t menu_prev_pin = 3;
uint8_t menu_up_pin = 2;
uint8_t menu_down_pin = 6;


void setup(void) {
  u8g2.begin(menu_select_pin, menu_next_pin, menu_prev_pin, menu_up_pin, menu_down_pin, U8X8_PIN_NONE);   // initialise display
  mui.begin(u8g2, fds_data, muif_list, sizeof(muif_list)/sizeof(muif_t));
  mui.gotoForm(/* form_id= */ 1, /* initial_cursor_position= */ 0);
  Serial.begin(9600);
}


uint8_t is_redraw = 1;
long milliseconds = 0;

void loop(void) {
   /* check whether the menu is active */
  if ( mui.isFormActive() ) {

    /* if so, then draw the menu */
    if ( is_redraw ) {
      u8g2.firstPage();
      do {
          mui.draw();
      } while( u8g2.nextPage() );
      is_redraw = 0;
    }
    
    /* handle events */
    switch(u8g2.getMenuEvent()) {
      case U8X8_MSG_GPIO_MENU_SELECT:
        mui.sendSelect();
        is_redraw = 1;
        break;
      case U8X8_MSG_GPIO_MENU_NEXT:
        mui.nextField();
        is_redraw = 1;
        break;
      case U8X8_MSG_GPIO_MENU_PREV:
        mui.prevField();
        is_redraw = 1;
        break;
    }
    
    /* did the user deactivate the menu? If so, start the countdown */
    
    if ( mui.isFormActive() )
      milliseconds = ((long)hours) * 1000;
      
  } else {
  
    /* menu not active: show countdown */
    
    if ( milliseconds <= 0 ) {
      /* countdown reached 0: activate menu again */
      /* The exit button has stored its location: restoreForm will */
      /* activate MUI and will put focus on the ok button */
      mui.restoreForm();        
    } else {
      /* execute countdown */
      u8g2.setFont(u8g2_font_helvR08_tr);
      u8g2.firstPage();
      do {
          u8g2.setCursor(0,20);
          u8g2.print(milliseconds);
      } while( u8g2.nextPage() );
      milliseconds -= 100;
      delay(100);
    }
  }
} /* loop */