#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include <WiFi.h>
#include <ThingSpeak.h>  // Include the ThingSpeak library

// Konfigurasi WiFi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Konfigurasi ThingSpeak
unsigned long myChannelNumber = 2635819;
const char* myWriteAPIKey = "R1R3T28EXW2ZVV4T";

WiFiClient client;

// Define pins for ILI9341
#define TFT_CS    15  // Chip select
#define TFT_RST   -1  // Reset pin, -1 if connected to reset on board
#define TFT_DC    2   // Data/Command pin

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

float voltage1, current1, power1, energy1, frequency1, pf1, va1, VAR1;
float voltage2, current2, power2, energy2, frequency2, pf2, va2, VAR2;
float voltage3, current3, power3, energy3, frequency3, pf3, va3, VAR3;
float energytot;

// Timing variables
unsigned long lastValueUpdate = 0;
unsigned long lastDisplayUpdate = 0;

const unsigned long valueUpdateInterval = 2000;  // 2 seconds
const unsigned long displayUpdateInterval = 10000;  // 10 seconds for each slide

int currentSlide = 0;  // Track which slide is currently displayed

void setup() {
  Serial.begin(115200);
  tft.begin();                   
  tft.setRotation(0); // Orientasi Landscape
  tft.fillScreen(ILI9341_BLACK);  // Use ILI9341 color constants
  tft.setTextSize(1);
  tft.setTextColor(ILI9341_CYAN, ILI9341_BLACK);  // Use ILI9341 color constants
  tft.setCursor(28, 5);
  tft.print("UP3 Palangka");
  tft.setTextSize(1);
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
  tft.setCursor(38, 18);
  tft.print("PZEM-004T");
  tft.setTextColor(ILI9341_YELLOW, ILI9341_BLACK);
  tft.setCursor(20, 105);
  tft.print("ALAT UKUR TRAFO");
  tft.setTextSize(1);
  tft.setTextColor(ILI9341_RED, ILI9341_BLACK);
  tft.setCursor(40, 120);
  tft.print("3-PHASE");
  tft.setTextColor(ILI9341_GREEN, ILI9341_BLACK);
  tft.setCursor(11, 135);
  tft.print("PZEM004T + PZEM017");

  Serial.print("Connecting to WiFi SSID: ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  int max_attempts = 20;
  int attempts = 0;

  while (WiFi.status() != WL_CONNECTED && attempts < max_attempts) {
    delay(500);
    Serial.print(".");
    attempts++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println();
    Serial.println("Connected to WiFi");
  } else {
    Serial.println();
    Serial.println("Failed to connect to WiFi");
    while (true) {
      delay(1000); // Stay here forever
    }
  }
 
  delay(3000);
  ThingSpeak.begin(client); // Initialize ThingSpeak
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - lastValueUpdate >= valueUpdateInterval) {
    lastValueUpdate = currentMillis;
    updateValues();
  }

  if (currentMillis - lastDisplayUpdate >= displayUpdateInterval) {
    lastDisplayUpdate = currentMillis;
    updateDisplay(currentSlide);
    currentSlide = (currentSlide + 1) % 2;
  }
}

void updateValues() {
  // Read values from PZEM004T or other sources
}

void updateDisplay(int slide) {
  tft.fillScreen(ILI9341_BLACK);

  if (slide == 0) {
    tft.setCursor(5, 2);
    tft.setTextSize(1);
    tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
    tft.println("PHASE R");

    tft.setTextColor(ILI9341_GREEN, ILI9341_BLACK);
    tft.setCursor(5, 15);
    tft.printf("VOLTAGE  ");
    tft.setCursor(54, 15);
    tft.printf("%6.2fV", voltage1);

    tft.setTextColor(ILI9341_YELLOW, ILI9341_BLACK);
    tft.setCursor(5, 25);
    tft.printf("CURRENT  ");
    tft.setCursor(54, 25);
    tft.printf("%6.2fA", current1);

    tft.setTextColor(ILI9341_CYAN, ILI9341_BLACK);
    tft.setCursor(5, 35);
    tft.printf("POWER    ");
    tft.setCursor(54, 35);
    tft.printf("%6.2fW", power1);

    tft.setTextColor(ILI9341_ORANGE, ILI9341_BLACK);
    tft.setCursor(5, 45);
    tft.printf("ENERGY   ");
    tft.setCursor(54, 45);
    tft.printf("%6.2fkWh", energy1);

    tft.setCursor(58, 2);
    tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
    tft.println("PHASE S");

    tft.setTextColor(ILI9341_GREEN, ILI9341_BLACK);
    tft.setCursor(58, 15);
    tft.printf("VOLTAGE  ");
    tft.setCursor(107, 15);
    tft.printf("%6.2fV", voltage2);

    tft.setTextColor(ILI9341_YELLOW, ILI9341_BLACK);
    tft.setCursor(58, 25);
    tft.printf("CURRENT  ");
    tft.setCursor(107, 25);
    tft.printf("%6.2fA", current2);

    tft.setTextColor(ILI9341_CYAN, ILI9341_BLACK);
    tft.setCursor(58, 35);
    tft.printf("POWER    ");
    tft.setCursor(107, 35);
    tft.printf("%6.2fW", power2);

    tft.setTextColor(ILI9341_ORANGE, ILI9341_BLACK);
    tft.setCursor(58, 45);
    tft.printf("ENERGY   ");
    tft.setCursor(107, 45);
    tft.printf("%6.2fkWh", energy2);

  } else {
    tft.setCursor(5, 2);
    tft.setTextSize(1);
    tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
    tft.println("PHASE T");

    tft.setTextColor(ILI9341_GREEN, ILI9341_BLACK);
    tft.setCursor(5, 15);
    tft.printf("VOLTAGE  ");
    tft.setCursor(54, 15);
    tft.printf("%6.2fV", voltage3);

    tft.setTextColor(ILI9341_YELLOW, ILI9341_BLACK);
    tft.setCursor(5, 25);
    tft.printf("CURRENT  ");
    tft.setCursor(54, 25);
    tft.printf("%6.2fA", current3);

    tft.setTextColor(ILI9341_CYAN, ILI9341_BLACK);
    tft.setCursor(5, 35);
    tft.printf("POWER    ");
    tft.setCursor(54, 35);
    tft.printf("%6.2fW", power3);

    tft.setTextColor(ILI9341_ORANGE, ILI9341_BLACK);
    tft.setCursor(5, 45);
    tft.printf("ENERGY   ");
    tft.setCursor(54, 45);
    tft.printf("%6.2fkWh", energy3);

    tft.setCursor(5, 65);
    tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
    tft.println("TOTAL ENERGY");

    tft.setCursor(5, 75);
    tft.setTextColor(ILI9341_ORANGE, ILI9341_BLACK);
    tft.printf("%6.2fkWh", energytot);
  }
}