#include <WiFi.h>
#include <ThingSpeak.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define DHTPIN 4      // Pin ESP yang tersambung ke pin Data DHT22 (pin 4)
#define DHTTYPE DHT22 // Jenis sensor DHT 22 (AM2302)

DHT dht(DHTPIN, DHTTYPE);

float hum = 0;  // Variabel untuk menyimpan nilai kelembaban
float temp = 0; // Variabel untuk menyimpan nilai suhu
float hic = 0;  // Heat index dalam celcius

#define SCREEN_WIDTH 128 // Lebar display OLED dalam pixels
#define SCREEN_HEIGHT 64 // Tinggi display OLED dalam pixels
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);

char ssid[] = "Wokwi-GUEST"; // Wokwi Wifi
char pass[] = "";            // Password kosong
int keyIndex = 0;            // Nomor index key jaringan (hanya untuk WEP)
WiFiClient client;

unsigned long myChannelNumber = 3062102;
const char *myWriteAPIKey = "P4ZAJNT3RO7RAG6J";

unsigned long previousMillis = 0;
const long ts_update_interval = 20000; // Update data setiap 20 detik

// 'thermometer' icon, 48x48px - DATA DIPERBAIKI
const unsigned char thermo[] PROGMEM = {
    0x00, 0x07, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xf8, 0x00, 0x00, 0x00,
    0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
    0x01, 0xff, 0xff, 0x80, 0x00, 0x00, 0x03, 0xff, 0xff, 0xc0, 0x00, 0x00,
    0x07, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xff, 0xe0, 0x00, 0x00,
    0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00,
    0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00,
    0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00,
    0x07, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xff, 0xe0, 0x00, 0x00,
    0x03, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x01, 0xff, 0xff, 0x80, 0x00, 0x00,
    0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfe, 0x00, 0x00, 0x00,
    0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xf8, 0x00, 0x00, 0x00,
    0x00, 0x07, 0xe0, 0x00, 0x00, 0x00};

// 'wifi connected', 16x16px - Hex value diperbaiki
const unsigned char wifi_icon[] PROGMEM = {
    0x00, 0x00, 0x00, 0x00, 0x07, 0xe0, 0x1f, 0xf8, 0x7c, 0x3e, 0x07, 0xe7,
    0xdf, 0xfb, 0x39, 0x1c, 0x37, 0xec, 0x0f, 0xf0, 0x0f, 0xf0, 0x03, 0xc0,
    0x03, 0xc0, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00};

// 'wifi disconnected', 16x16px - Format diperbaiki
const unsigned char wifi_dc[] PROGMEM = {
    0x00, 0x00, 0x00, 0x04, 0x03, 0xce, 0x1f, 0xdc, 0x7f, 0xba, 0xf8, 0x77,
    0x60, 0xe6, 0x05, 0xc0, 0x0b, 0xb0, 0x07, 0x70, 0x0e, 0x20, 0x1c, 0x00,
    0x1b, 0xb0, 0x03, 0xc0, 0x01, 0x80, 0x00, 0x00};

const unsigned char Update_OK[] PROGMEM = {
    0x01, 0x80, 0x0e, 0x70, 0x10, 0x08, 0x20, 0x04, 0x40, 0x32, 0x40, 0x62,
    0x84, 0x63, 0x83, 0xc3, 0x41, 0x82, 0x40, 0x02, 0x40, 0x06, 0x20, 0x04,
    0x10, 0x08, 0x0e, 0x70, 0x01, 0x80};

const unsigned char Update_NOK[] PROGMEM = {
    0x01, 0x80, 0x0e, 0x70, 0x10, 0x08, 0x20, 0x04, 0x48, 0x32, 0x44, 0x62,
    0xc2, 0x81, 0x82, 0x83, 0x82, 0xc6, 0x42, 0x4c, 0x22, 0x48, 0x16, 0x20,
    0x10, 0x18, 0x0e, 0xf0, 0x01, 0x80};

void ConnectWIFI()
{
    if (WiFi.status() != WL_CONNECTED)
    {
        Serial.print("Attempting to connect to SSID: ");
        Serial.println(ssid);
        WiFi.mode(WIFI_STA);
        WiFi.begin(ssid, pass); // Untuk Simulasi >> Spesifik channel 6
        int i = 0;
        int a = 0;
        while (WiFi.status() != WL_CONNECTED)
        {
            Serial.print(".");
            display.clearDisplay();
            display.setTextSize(1);
            if (a == 0)
            {
                display.drawBitmap(52, 15, wifi_icon, 16, 16, WHITE);
                a = 1;
            }
            else
            {
                display.drawBitmap(52, 15, wifi_icon, 16, 16, BLACK);
                a = 0;
            }
            display.setCursor(25, 38);
            display.print("Connecting ...");
            display.display();
            delay(1000);
            ++i;
            if (i == 30)
            {
                i = 0;
                Serial.println("\n Failed to Connect.");
                break;
            }
        }
    }

    if (WiFi.status() == WL_CONNECTED)
    {
        Serial.println("\n Connected!");
        display.clearDisplay();
        display.setTextSize(1);
        display.drawBitmap(52, 15, wifi_icon, 16, 16, WHITE);
        display.setCursor(33, 38);
        display.print("Connected!");
        display.display();
    }
    else
    {
        display.clearDisplay();
        display.setTextSize(1);
        display.drawBitmap(52, 15, wifi_dc, 16, 16, WHITE);
        display.setCursor(20, 38);
        display.print("Wifi Connection");
        display.setCursor(36, 48);
        display.print("Failed!");
        display.display();
    }
    delay(3000);
}

void setup()
{
    Serial.begin(9600);
    Serial.println(F("Temp & Hum Monitoring System"));
    dht.begin();

    // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
    {
        Serial.println(F("SSD1306 allocation failed"));
        for (;;)
            ;
    }

    // Just intro
    display.clearDisplay();
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.println(F("ThingSpeak"));
    display.setCursor(30, 20);
    display.println(F("Temp-Hum Monitor"));
    display.display(); // Tampilkan data
    delay(3000);
    WiFi.mode(WIFI_STA);
    ThingSpeak.begin(client); // Initialize ThingSpeak
    ConnectWIFI();
}

void loop()
{
    hum = dht.readHumidity();
    temp = dht.readTemperature(); // Membaca suhu dalam Celsius

    // Check if any reads failed and exit early (to try again).
    if (isnan(hum) || isnan(temp))
    {
        Serial.println(F("Gagal mendapat data dari sensor DHT!"));
        return;
    }

    // Compute heat index in Celsius (isFahreheit = false)
    hic = dht.computeHeatIndex(temp, hum, false);

 
    Serial.print(F("Kelembaban: "));
    Serial.print(hum);
    Serial.print(F("% "));
    Serial.print(F("Suhu: "));
    Serial.print(temp);
    Serial.print(F("°C "));
    Serial.print(F("Heat index: "));
    Serial.print(hic);
    Serial.println(F("°C "));

    display.clearDisplay();
    // PERBAIKAN: Menggunakan ukuran bitmap yang baru (48x48)
    display.drawBitmap(0, 5, thermo, 48, 48, WHITE);
    display.setTextSize(1); // Ukuran teks sudah diatur ke 1 (paling kecil)

    // 1. Menampilkan nama di bagian atas
    display.setCursor(55, 8);
    display.print(F("by fahmi"));

    // 2. Menampilkan Suhu
    display.setCursor(55, 22);
    display.print(temp);
    display.print(F(" C"));

    // 3. Menampilkan Kelembaban
    display.setCursor(55, 36);
    display.print(hum);
    display.print(F(" %"));

    // 4. Menampilkan Heat Index
    display.setCursor(55, 50);
    display.print(F("HI: ")); 
    display.print(hic);
    display.print(F(" C"));
  

    if (WiFi.status() != WL_CONNECTED)
    {
        display.drawBitmap(110, 0, wifi_dc, 16, 16, WHITE);
    }
    else
    {
        display.drawBitmap(110, 0, wifi_icon, 16, 16, WHITE);
    }

    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= ts_update_interval)
    {
        previousMillis = currentMillis;
        if (WiFi.status() != WL_CONNECTED)
        {
            Serial.print("Attempting to connect to SSID: ");
            Serial.println(ssid);
            WiFi.begin(ssid, pass);
            int i = 0;
            while (WiFi.status() != WL_CONNECTED)
            {
                delay(500);
                Serial.print(".");
                ++i;

                if (i == 20)
                {
                    i = 0;
                    Serial.println("\n Failed to Connect.");
                    break;
                }
            }
        }

        ThingSpeak.setField(1, hum);  // Field humidity
        ThingSpeak.setField(2, temp); // Field temperature
        ThingSpeak.setField(3, hic);  // Field heat index

        // Write to the ThingSpeak channel
        int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
        if (x == 200)
        {
            Serial.println("Sukses Update Chanel.");
            display.drawBitmap(90, 0, Update_OK, 16, 16, WHITE);
        }
        else
        {
            Serial.println("Update Chanel Bermasalah. HTTP error code " + String(x));
            display.drawBitmap(90, 0, Update_NOK, 16, 16, WHITE);
        }
    }

    display.display();
    delay(2000);
}