#include "DHT.h"
#include "Wire.h"
#include "Adafruit_MPU6050.h"
#include "Adafruit_Sensor.h"

// Pin Definitions
#define DHT_PIN  4          // DHT22 Data Pin
#define SOIL_PIN 34         // Analog Pin for Soil Moisture Sensor
#define PIEZO_PIN 35        // Analog Pin for Piezometer (Pore Pressure Sensor)
#define DHT_TYPE DHT22

// Thresholds for landslide detection
#define SOIL_MOISTURE_THRESHOLD 60.0  // Soil moisture threshold in percentage
#define TEMP_THRESHOLD 35.0           // Temperature threshold in °C
#define HUMIDITY_THRESHOLD 90.0       // Humidity threshold in %
#define ACCEL_THRESHOLD 1.5           // Sudden acceleration in m/s²
#define PORE_PRESSURE_THRESHOLD 70.0  // Threshold for pore water pressure (0-100 scaled)

// Sensor Instances
DHT dht(DHT_PIN, DHT_TYPE);
Adafruit_MPU6050 mpu;

// Function to scale analogRead() values to floating-point percentages
float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void setup() {
  Serial.begin(115200);
  dht.begin();
  Wire.begin();

  // MPU6050 Initialization
  if (!mpu.begin()) {
    Serial.println("Failed to find MPU6050 sensor!");
    while (1);
  }
  Serial.println("MPU6050 Found!");

  Serial.println("Landslide Monitoring System Initialized.");
}

void loop() {
  float soilMoisture = readSoilMoisture();
  float porePressure = readPorePressure();
  float temperature, humidity;
  readDHT22(&temperature, &humidity);
  float accel = readAcceleration();

  // Print all sensor readings
  Serial.print("Soil Moisture: ");
  Serial.printf("%.2f%% | ", soilMoisture);

  Serial.print("Pore Pressure: ");
  Serial.printf("%.2f | ", porePressure);

  Serial.print("Temperature: ");
  Serial.printf("%.2f°C | ", temperature);

  Serial.print("Humidity: ");
  Serial.printf("%.2f%% | ", humidity);

  Serial.print("Acceleration: ");
  Serial.printf("%.2f m/s²\n", accel);

  // Check for Landslide Conditions
  if (soilMoisture > SOIL_MOISTURE_THRESHOLD) {
    Serial.println("ALERT: Soil Moisture Threshold Breached!");
  }
  if (porePressure > PORE_PRESSURE_THRESHOLD) {
    Serial.println("ALERT: Pore Pressure Threshold Breached!");
  }
  if (temperature > TEMP_THRESHOLD) {
    Serial.println("ALERT: Temperature Threshold Breached!");
  }
  if (humidity > HUMIDITY_THRESHOLD) {
    Serial.println("ALERT: Humidity Threshold Breached!");
  }
  if (accel > ACCEL_THRESHOLD) {
    Serial.println("ALERT: Sudden Acceleration Detected!");
  }
  if (soilMoisture <= SOIL_MOISTURE_THRESHOLD &&
      porePressure <= PORE_PRESSURE_THRESHOLD &&
      temperature <= TEMP_THRESHOLD &&
      humidity <= HUMIDITY_THRESHOLD &&
      accel <= ACCEL_THRESHOLD) {
    Serial.println("System Normal.");
  }

  delay(10);  // Wait for 2 seconds before the next reading
}

// Function to read soil moisture
float readSoilMoisture() {
  int rawValue = analogRead(SOIL_PIN);
  return mapFloat(rawValue, 0, 4095, 0.0, 100.0);  // Scale to percentage
}

// Function to read pore pressure
float readPorePressure() {
  int rawValue = analogRead(PIEZO_PIN);
  return mapFloat(rawValue, 0, 4095, 0.0, 100.0);  // Scale to