#include "esp_camera.h"
#include <WiFi.h>
#include <HttpClient.h>
#include <Servo.h>

// Traffic Light Pins
#define GREEN_LED 12
#define YELLOW_LED 13
#define RED_LED 14

// Servo Motor Pin
#define SERVO_PIN 15

// Wi-Fi Credentials
const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

// Speed Limit (in km/h)
#define SPEED_LIMIT 50

// Global Variables
int carCount = 0;
Servo barrier;
WiFiClient client;
HttpClient http(client);

// Camera Configuration
void setupCamera() {
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = 5;
  config.pin_d1 = 18;
  config.pin_d2 = 19;
  config.pin_d3 = 21;
  config.pin_d4 = 36;
  config.pin_d5 = 39;
  config.pin_d6 = 34;
  config.pin_d7 = 35;
  config.pin_xclk = 0;
  config.pin_pclk = 22;
  config.pin_vsync = 25;
  config.pin_href = 23;
  config.pin_sscb_sda = 26;
  config.pin_sscb_scl = 27;
  config.pin_pwdn = 32;
  config.pin_reset = -1;
  config.pin_xclk = 0;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;

  if (psramFound()) {
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

  // Initialize the camera
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }
}

// Setup Function
void setup() {
  Serial.begin(115200);

  // Initialize Traffic Light Pins
  pinMode(GREEN_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);

  // Initialize Servo Motor
  barrier.attach(SERVO_PIN);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWi-Fi Connected");

  // Initialize Camera
  setupCamera();
}

// Traffic Light Control
void controlTrafficLight() {
  // Green Light
  digitalWrite(GREEN_LED, HIGH);
  digitalWrite(YELLOW_LED, LOW);
  digitalWrite(RED_LED, LOW);
  delay(5000); // 5 seconds

  // Yellow Light
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(YELLOW_LED, HIGH);
  digitalWrite(RED_LED, LOW);
  delay(2000); // 2 seconds

  // Red Light
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(YELLOW_LED, LOW);
  digitalWrite(RED_LED, HIGH);
  delay(5000); // 5 seconds
}

// Car Count Using Motion Detection
void countCars() {
  camera_fb_t *fb = esp_camera_fb_get();
  if (!fb) return;

  // Simple Motion Detection (Compare Frames)
  // Replace this with actual motion detection logic
  bool motionDetected = true; // Placeholder for motion detection

  if (motionDetected) {
    carCount++;
    Serial.printf("Car Count: %d\n", carCount);
  }

  // Return the frame buffer
  esp_camera_fb_return(fb);
}

// Speed Limit Detection
void detectSpeed() {
  float speed = calculateSpeed(); // Implement this function
  if (speed > SPEED_LIMIT) {
    sendNotification(speed);
  }
}

// Calculate Speed (Placeholder Function)
float calculateSpeed() {
  // Implement speed calculation logic
  // Measure time between two points in the camera frame
  return 60; // Example speed
}

// Send Notification to Traffic Police
void sendNotification(float speed) {
  String url = "http://traffic-police-api.com/notify?speed=" + String(speed);
  http.get(url);
  Serial.println("Notification sent!");
}

// Servo Motor Control
void controlBarrier() {
  barrier.write(90); // Open barrier
  delay(5000);
  barrier.write(0); // Close barrier
  delay(5000);
}

// Main Loop
void loop() {
  // Control Traffic Light
  controlTrafficLight();

  // Count Cars
  countCars();

  // Detect Speed
  detectSpeed();

  // Control Barrier (Optional)
  controlBarrier();
}