#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <SD.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

// BMP280 settings
#define BMP_SCK  (18)
#define BMP_MISO (19)
#define BMP_MOSI (23)
#define BMP_CS   (5)
Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);

// DHT22 settings
#define DHTPIN 32
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LCD settings
#define LCD_ADDRESS 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

// LED settings
#define LED_PIN 13

// Button settings
#define TEMP_BUTTON_PIN 12
#define HUMI_BUTTON_PIN 4
#define PRESS_BUTTON_PIN 14
#define WEATHER_BUTTON_PIN 33

// SD card settings
#define SD_CS_PIN 15

// Wi-Fi settings
const char* ssid = "Wokwi-GUEST";          // Wi-Fi network name
const char* password = "";  // Wi-Fi password

// AskSensors settings
const char* serverUrl = "https://asksensors.com/api/v1/sensors/data"; // AskSensors API endpoint
String apiKey = "2MgRtwKACiuVne02NrElfKHIYdXrm5sg";  // Replace with your AskSensors API Key

int displayMode = 0; // 0: temperature, 1: humidity, 2: pressure, 3: weather forecast

void setup() {
  Serial.begin(115200);
  Serial.println(F("BMP280 and DHT22 Test"));

  // Initialize BMP280
  if (!bmp.begin()) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
    while (1);
  }

  // Default BMP280 settings
  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,
                  Adafruit_BMP280::SAMPLING_X2,
                  Adafruit_BMP280::SAMPLING_X16,
                  Adafruit_BMP280::FILTER_X16,
                  Adafruit_BMP280::STANDBY_MS_500);
  
  // Set up LED pin
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  // Initialize DHT22
  dht.begin();

  // Initialize LCD
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
  lcd.init();
  lcd.backlight();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize button pins
  pinMode(TEMP_BUTTON_PIN, INPUT_PULLUP);
  pinMode(HUMI_BUTTON_PIN, INPUT_PULLUP);
  pinMode(PRESS_BUTTON_PIN, INPUT_PULLUP);
  pinMode(WEATHER_BUTTON_PIN, INPUT_PULLUP);

  // Initialize SD card
  if (!SD.begin(SD_CS_PIN)) {
    Serial.println("SD card initialization failed!");
    return;
  }
  Serial.println("SD card initialized.");
}

void loop() {
  // Sensor readings
  float humidity = dht.readHumidity();
  float temperatureDHT = dht.readTemperature();
  float pressure = bmp.readPressure() / 100;
  float temperatureBMP = bmp.readTemperature();

  if (isnan(humidity) || isnan(temperatureDHT) || isnan(pressure)) {
    Serial.println("Sensor error.");
    return;
  }

  // Handle button presses for display mode selection
  checkButtons();

  // Display data on LCD
  displayData(temperatureDHT, humidity, pressure);

  // LED temperature threshold check
  controlLED(temperatureDHT);

  // Log data to SD card
  logDataToSD(temperatureDHT, humidity, pressure);

  // Send data to AskSensors
  sendToAskSensors(temperatureDHT, humidity, pressure);

  delay(2000);
}

void checkButtons() {
  if (digitalRead(TEMP_BUTTON_PIN) == LOW) {
    displayMode = 0;
    delay(200); // Debounce
  } else if (digitalRead(HUMI_BUTTON_PIN) == LOW) {
    displayMode = 1;
    delay(200);
  } else if (digitalRead(PRESS_BUTTON_PIN) == LOW) {
    displayMode = 2;
    delay(200);
  } else if (digitalRead(WEATHER_BUTTON_PIN) == LOW) {
    displayMode = 3;
    delay(200);
  }
}

void displayData(float temperature, float humidity, float pressure) {
  lcd.clear();
  if (displayMode == 0) {
    lcd.setCursor(0, 0);
    lcd.print("Temperature:");
    lcd.setCursor(0, 1);
    lcd.print(temperature);
    lcd.print((char)223);
    lcd.print("C");
  } else if (displayMode == 1) {
    lcd.setCursor(0, 0);
    lcd.print("Humidity:");
    lcd.setCursor(0, 1);
    lcd.print(humidity);
    lcd.print(" %");
  } else if (displayMode == 2) {
    lcd.setCursor(0, 0);
    lcd.print("Pressure:");
    lcd.setCursor(0, 1);
    lcd.print(pressure);
    lcd.print(" hPa");
  } else if (displayMode == 3) {
    lcd.setCursor(0, 0);
    lcd.print("Weather: ");
    lcd.setCursor(0, 1);
    lcd.print(getWeatherForecast(temperature, humidity));
  }
}

void controlLED(float temperature) {
  if (temperature > 50) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("LED ON: Temperature above 50°C");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("LED OFF: Temperature below 50°C");
  }
}

void logDataToSD(float temperature, float humidity, float pressure) {
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.print("Temperature: ");
    dataFile.print(temperature);
    dataFile.print(" °C, Humidity: ");
    dataFile.print(humidity);
    dataFile.print(" %, Pressure: ");
    dataFile.print(pressure);
    dataFile.println(" hPa");
    dataFile.close();
    Serial.println("Data logged to SD card.");
  } else {
    Serial.println("Error opening datalog.txt.");
  }
}

String getWeatherForecast(float temperature, float humidity) {
  if (temperature > 25 && humidity < 60) {
    return "Sunny";
  } else if (temperature >= 20 && temperature <= 25 && humidity >= 60 && humidity <= 80) {
    return "Cloudy";
  } else if (temperature < 20 || humidity > 80) {
    return "Rainy";
  } else {
    return "Unknown";
  }
}

// Function to send data to AskSensors
void sendToAskSensors(float temperature, float humidity, float pressure) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    // Set up the HTTP request
    http.begin(serverUrl); // Specify the AskSensors API endpoint
    http.addHeader("Content-Type", "application/json"); // Set content type to JSON
    http.addHeader("API-Key", apiKey); // Add your API key to the header

    // Prepare JSON data
    DynamicJsonDocument doc(1024);
    doc["temperature"] = temperature;
    doc["humidity"] = humidity;
    doc["pressure"] = pressure;

    String jsonData;
    serializeJson(doc, jsonData); // Serialize the data into JSON format

    // Send the HTTP POST request
    int httpResponseCode = http.POST(jsonData);

    // Handle the response
    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
    }

    // Close the HTTP connection
    http.end();
  } else {
    Serial.println("WiFi Disconnected");
  }
}