#include <LiquidCrystal.h>

const int value_max_number=10;
/* Display */
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

int value_select,value_digit_select=1;
int key_repeat_delay=200;
int value_int[value_max_number];

char *value_name[value_max_number]={"1.Up stroke","2.Down stroke","3.Up fwd speed","4.Up fwd pos","5.Up back speed","6.Up back pos","7.Down fwd speed","8.Down fwd pos","9.Down back speed","10.Down back pos"};

bool debounce=true;
bool key_up, key_down, key_left, key_right,values_edit;
bool refresh;

unsigned long preset_millis,last_millis; //it must be long to receive the output of millis()


void setup() {
  //Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.clear();
  lcd.noCursor();
  //lcd.setCursor(1, 0);
  //pinMode(A0,INPUT);
  //pinMode(A1,INPUT);
  //pinMode(A2,INPUT);
  //pinMode(A3,INPUT);
  refresh=true;
  value_select=0;
  lcd.setCursor(0, 0);
  lcd.print("Skoufias        Konstantinos");
  delay(500);
  lcd.setCursor(0, 1);
  lcd.print("stepper controller v0.8");
  delay(500);
}

void screen_refresh() {
  if(value_select<0) value_select=0;
  if(value_select>value_max_number) value_select=value_max_number;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(value_name[value_select]);
  lcd.setCursor(5, 1);
  //lcd.print(key_repeat_delay);                                      //for debuging
  if(values_edit==true) lcd.print(">"); else lcd.print(" ");
  lcd.print(value_int[value_select]);
  if(values_edit==true) 
  refresh=false;
}

void key_pressed() {
 int analog_key_pressed;

 key_down=LOW;
 key_up=LOW;
 key_left=LOW;
 key_right=LOW;
 analog_key_pressed = analogRead(0);
 lcd.setCursor(0, 0);
 lcd.print (analog_key_pressed);
 if (analog_key_pressed<60) { //Right
   key_right=HIGH;
 }
 else if (analog_key_pressed<200) { //Up
   key_up=HIGH;
 }
 else if (analog_key_pressed<400){ //Down
   key_down=HIGH;
 }
 else if (analog_key_pressed<600){ //Left
   key_left=HIGH;
 }
 //else if (analog_key_pressed < 800){ //Select
 //  LCD.print ("Select");
 //}
}

void loop() {

  if (refresh==true) screen_refresh();
  refresh=false;

  preset_millis=millis();

  key_pressed();
  /*
  key_down=digitalRead(A1);
  key_up=digitalRead(A2);
  key_left=digitalRead(A3);
  key_right=digitalRead(A0); */
 
  if (key_up==HIGH && debounce==false) {
    if (values_edit==true) {
     value_int[value_select]++;
     debounce=true;
     //value_int[3]=key_repeat_delay;
     key_repeat_delay-=6;
     if (key_repeat_delay<0) key_repeat_delay=0;
     last_millis=preset_millis;
     refresh=true;
    } 
    if (values_edit==false) {
     value_select++;
     if(value_select>value_max_number) value_select=0;
     if(value_select<0) value_select=value_max_number;
     debounce=true;
     last_millis=preset_millis;
     refresh=true;
    } 
  }
 
  if (key_down==HIGH && debounce==false) {
    if (values_edit==true) {
     value_int[value_select]--;
     debounce=true;
     //value_int[3]=key_repeat_delay;
     key_repeat_delay-=6;
     if (key_repeat_delay<0) key_repeat_delay=0;
     last_millis=preset_millis;
     refresh=true;
    }
    if (values_edit==false) {
     value_select--;
     if(value_select>value_max_number) value_select=0;
     if(value_select<0) value_select=value_max_number;
     debounce=true;
     last_millis=preset_millis;
     refresh=true;
    }  
  }

  if (key_right==HIGH && debounce==false && values_edit==true) {
    value_digit_select++;
    if(value_digit_select>10) value_digit_select=0;
    if(value_digit_select<1) value_digit_select=10;
    value_int[value_select]=value_int[value_select]+(10*value_digit_select);
    debounce=true;
    last_millis=preset_millis;
    refresh=true;
  }

  if (key_left==HIGH && debounce==false) {
   if (values_edit==true) { 
     values_edit=false; 
    } 
    else {
     values_edit=true;
    }
    debounce=true;
    last_millis=preset_millis;
    refresh=true;
  }

  if ((key_down==LOW && key_up==LOW && key_left==LOW && key_right==LOW) || (debounce==true))
  {
    if (debounce==false) key_repeat_delay=200;
    if (preset_millis-last_millis>key_repeat_delay) {
     debounce=false;
    }
  }
}