#include <LiquidCrystal_I2C.h>
#include <ArduinoJson.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define uparrow 18
#define downarrow 5
#define submitBtn 17

char* input = "[{\"id\":1,\"name\":\"Anurag Biswal\",\"sic\":\"21becc17\",\"votes\":0},{\"id\":2,\"name\":\"Prithvi Mandal\",\"sic\":\"21bect34\",\"votes\":0}]";
//char* input = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
JsonDocument doc;
String candidates[5];
String selectedCandidate;
int idx = 0;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
  pinMode(uparrow, INPUT_PULLUP);
  pinMode(downarrow, INPUT_PULLUP);
  pinMode(submitBtn, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Hello World");
  delay(500);
  lcd.clear();
  deserializeJson(doc, input);
  Serial.println(doc.size());
  for(int i=0;i<doc.size();i++){
    candidates[i] = doc[i]["name"].as<String>();
  }

  for(int i=0;i<doc.size();i++){
    Serial.print(candidates[i]);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  selectedCandidate = SelectionDisplay(candidates);
  Serial.println(selectedCandidate);
  delay(1000); // this speeds up the simulation
}

String readBtnState(int btns[]) {
  String btnstate = "111";
  for (uint8_t i = 0; i < 3; i++) {
    btnstate.setCharAt(i, digitalRead(btns[i]) + '0');
  }
  return btnstate;
}

String SelectionDisplay(String options[]) {
  int idx =0;
  String btnState;
  lcd.setCursor(0,0);
  lcd.print("Select Mode");
  int btns[] = {18,5,17};
  while(1){
    btnState = readBtnState(btns);
    if(btnState == "011") idx=idx+1;
    else if(btnState == "101") idx = idx-1;
    else if(btnState == "110") break;
    idx = idx%doc.size();
    lcd.setCursor(0,1);
    lcd.print(options[idx]);
    delay(100);
  }
}