/*
  ESP32 + ILI9341 LCD Basic Example

  https://wokwi.com/projects/325324981270479442
*/

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "DHT.h"
#include <TFT_eSPI.h> // Hardware-specific library

#define TFT_GREY 0x5AEB

TFT_eSPI tft = TFT_eSPI();       // Invoke custom library

uint32_t targetTime = 0;                    // for next 1 second timeout

//static uint8_t conv2d(const char* p); // Forward declaration needed for IDE 1.6.x

//uint8_t hh = conv2d(__TIME__), mm = conv2d(__TIME__ + 3), ss = conv2d(__TIME__ + 6); // Get H, M, S from compile time

byte omm = 99, oss = 99;
byte xcolon = 0, xsecs = 0;
unsigned int colour = 0;

#define TFT_DC 2
#define TFT_CS 15

#define DHTPIN	13
// Global variables and defines
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

int displayMode = 0;
bool displayInit = false;

//Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

struct Sensor{
  String Location;
  int xPos;
  int yPos;
  int Color;
  //DHT Dht;
};

Sensor sensors[1];

void setup() {
  dht.begin();
  changeDisplay(0);

  sensors[0].Location = "Tank";
  sensors[0].xPos = 32;
  sensors[0].yPos = 40;
  sensors[0].Color = ILI9341_YELLOW;
}

void loop() { 

  float dhtHumidity = dht.readHumidity();
    // Read temperature in Celsius, for Fahrenheit use .readTempF()
    float dhtTempC = dht.readTemperature();
    Serial.print(F("Humidity: ")); Serial.print(dhtHumidity); Serial.print(F(" [%]\t"));
    Serial.print(F("Temp: ")); Serial.print(dhtTempC); Serial.println(F(" [C]"));
    delay(5000);

    switch(displayMode){
      case 0: 
        displaySensors();
        break;
      default:
        displaySensors();
        break;
    }
  }

  void displaySensors() {
    float dhtHumidity = dht.readHumidity();
    // Read temperature in Celsius, for Fahrenheit use .readTempF()
    float dhtTempC = dht.readTemperature();
    float dhtTempF = (int)round(1.8*dhtTempC+32);

    int xPos = 18;
    int yPos = 20;

    if (!displayInit) {
      tft.begin();

      tft.setRotation(3);
      
      tft.setCursor(xPos, yPos);
      tft.setTextColor(ILI9341_WHITE);
      tft.setTextSize(2);
      tft.println("Location    Temp    Hum");
      tft.drawLine(140,20, 140, 160, ILI9341_WHITE);
      tft.drawLine(230,20, 230, 160, ILI9341_WHITE);
      tft.drawLine(10,38, 300, 38, ILI9341_WHITE);
      
      displayInit = true;
    }

    for (int i=0; i<sizeof sensors/sizeof sensors[0]; i++) {
      tft.setCursor(sensors[i].xPos, sensors[i].yPos);
      tft.print(sensors[i].Location);
      tft.setCursor(160, sensors[i].yPos);
      tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
      
      tft.print(format3(dhtTempF));
    }
  }

  void changeDisplay(int display) {
    if(displayMode != display)
    {
      tft.fillScreen(TFT_BLACK);
      displayMode = display;
      displayInit = false;
    }
  }

  char * format3(float x)
{
    static char buffer[6];  // 5 chars + terminating NUL
    snprintf(buffer, sizeof buffer, "%5d", x);
    return buffer;
}