#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <string.h>

struct UserData
{
  String name;
  String city;
  String alarm;
};
struct WeatherData
{
  String temperature;
};
struct TimeData
{
  int hour;
  int minute;
  int second;
};

const char* k_ssid = "Wokwi-GUEST";
const char* k_password = "";

const String k_thingSpeakApi = "https://api.thingspeak.com/channels/1929706/feeds.json?results=1";
const String k_openWeatherMapApi = "http://api.openweathermap.org/data/2.5/weather?q=Sorocaba,br&APPID=cebc60ca0120bfe26aaadcc54c82481e&units=metric";
const String k_timeApi = "https://www.timeapi.io/api/Time/current/zone?timeZone=America/Sao_Paulo";

UserData m_currentUserData;
WeatherData m_currentWeatherData;
TimeData m_currentTimeData;

LiquidCrystal_I2C lcd(0x27, 16, 2);
HTTPClient http;

bool ringingAlarm = false;

void setup()
{
  Serial.begin(115200);
  
  initializeDisplay();
  initializeWifi();
  updateData();
}
void loop()
{
  drawWelcomeRequestSetup();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Obrigada, " + m_currentUserData.name + "!");

  delay(5000);

  while(true)
  {
    if(ringingAlarm == false)
    {
      drawMainScreen();
      if( m_currentTimeData.hour == m_currentUserData.alarm.substring(0, 2).toInt() &&
          m_currentTimeData.minute == m_currentUserData.alarm.substring(3, 5).toInt())
      {
        ringingAlarm = true;
      }

      delay(1000);
    }
    else
    {
      ringAlarm();
      drawAlarmScreen();

      if(digitalRead(34) == 1)
      {
        ringingAlarm = false;

        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Bom dia, " + m_currentUserData.name + "!");

        delay(5000);

        updateData();
      }

      delay(1000);
    }

    updateClockTime();
  }
}

void initializePins()
{
  pinMode(34, INPUT);
  pinMode(33, OUTPUT);
}
void initializeDisplay()
{
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 0);
}
void initializeWifi()
{
  WiFi.begin(k_ssid, k_password, 6); // rede, senha e canal do WiFi

  Serial.print("Conectando-se ao WiFi");

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(100);
    Serial.print(".");
  }

  Serial.print("OK! IP=");
  Serial.println(WiFi.localIP());
}
void updateData()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Buscando Usuario");
  m_currentUserData = fetchUserData();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Buscando Clima");
  m_currentWeatherData = fetchWeatherData();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Buscando Horario");
  m_currentTimeData = fetchTimeData();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Dados Atualizados");
}
UserData fetchUserData()
{
  UserData tempUserData;
  int httpResponseCode;

  http.begin(k_thingSpeakApi);
  httpResponseCode = http.GET();

  if(httpResponseCode > 0)
  {
    String payload = http.getString();
    payload = payload.substring(payload.indexOf("feeds"));

    String fetchedUserName = payload.substring(payload.indexOf("field1"));
    fetchedUserName = fetchedUserName.substring(9, fetchedUserName.indexOf(",") - 1);

    String fetchedUserCity = payload.substring(payload.indexOf("field2"));
    fetchedUserCity = fetchedUserCity.substring(9, fetchedUserCity.indexOf(",") - 1);

    String fetchedUserAlarm = payload.substring(payload.indexOf("field3"));
    fetchedUserAlarm = fetchedUserAlarm.substring(9, fetchedUserAlarm.indexOf("}") - 1);

    tempUserData.name = fetchedUserName;
    tempUserData.city = fetchedUserCity;
    tempUserData.alarm = fetchedUserAlarm;
  }

  return tempUserData;
}
WeatherData fetchWeatherData()
{
  WeatherData tempWeatherData;
  int httpResponseCode;

  String apiRequestUrl = k_openWeatherMapApi;
  apiRequestUrl.replace("CIDADE", m_currentUserData.city);

  http.begin(apiRequestUrl);
  httpResponseCode = http.GET();

  if(httpResponseCode > 0)
  {
    String payload = http.getString();

    String fetchedTemperature = payload.substring(payload.indexOf("temp"));
    fetchedTemperature = fetchedTemperature.substring(6, fetchedTemperature.indexOf(","));

    tempWeatherData.temperature = fetchedTemperature;
  }
  else
  {
    // Valor default pra demonstração no caso de a API não retornar valor.
    tempWeatherData.temperature = 25;
  }

  return tempWeatherData;
}
TimeData fetchTimeData()
{
  TimeData tempTimeData;
  int httpResponseCode;

  http.begin(k_timeApi);
  httpResponseCode = http.GET();

  if(httpResponseCode > 0)
  {
    String payload = http.getString();

    String fetchedHour = payload.substring(payload.indexOf("hour"));
    fetchedHour = fetchedHour.substring(6, fetchedHour.indexOf(","));

    String fetchedMinute = payload.substring(payload.indexOf("minute"));
    fetchedMinute = fetchedMinute.substring(8, fetchedMinute.indexOf(","));

    String fetchedSecond = payload.substring(payload.indexOf("seconds"));
    fetchedSecond = fetchedSecond.substring(9, fetchedSecond.indexOf(","));

    tempTimeData.hour = fetchedHour.toInt();
    tempTimeData.minute = fetchedMinute.toInt();
    tempTimeData.second = fetchedSecond.toInt();
  }

  return tempTimeData;
}

void drawWelcomeRequestSetup()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Oi! Sou a Fanny!");

  delay(3000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Configure-me");
  lcd.setCursor(0, 1);
  lcd.print("no app!");

  delay(3000);

  UserData newUserData;

  do
  {
    newUserData = fetchUserData();

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Aguardando");
    lcd.setCursor(0, 1);
    lcd.print("config...");
  }
  while ( newUserData.name == m_currentUserData.name && 
          newUserData.city == m_currentUserData.city &&
          newUserData.alarm == m_currentUserData.alarm);

  updateData();
}
void drawMainScreen()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(m_currentTimeData.hour);
  lcd.print(":");
  lcd.print(m_currentTimeData.minute);
  lcd.print(":");
  lcd.print(m_currentTimeData.second);

  lcd.setCursor(12, 0);
  lcd.print(m_currentWeatherData.temperature);
  lcd.print("C");

  lcd.setCursor(0, 1);
  if(m_currentWeatherData.temperature.toInt() >= 22)
  {
    lcd.print("Use roupas leves");
  }
  else
  {
    lcd.print("Agasalhe-se");
  }
}
void drawAlarmScreen()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Acorda, " + m_currentUserData.name + "!");
}

void updateClockTime()
{
  m_currentTimeData.second += 1;

  if(m_currentTimeData.second >= 60)
  {
    m_currentTimeData.second = 0;
    m_currentTimeData.minute += 1;
  }
  if(m_currentTimeData.minute >= 60)
  {
    m_currentTimeData.minute = 0;
    m_currentTimeData.hour += 1;
  }
  if(m_currentTimeData.hour >= 24)
  {
    m_currentTimeData.hour = 0;
  }
}

void ringAlarm()
{
  // Gera erro: 'E (118316) gpio: gpio_set_level(226): GPIO output gpio_num error'
  digitalWrite(33, 1);
  delay(500);
  digitalWrite(33, 0);
  delay(500);
}