#include <WiFi.h>
#include <WiFiClientSecure.h>

/* ================= IR SENSOR ================= */
#define IR_SENSOR_PIN 2  // GPIO2 for IR sensor
// IR sensor outputs:
// HIGH (1) = No object detected
// LOW (0) = Object detected

/* ================= WIFI DETAILS ================= */
const char* ssid = "Yourssid";
const char* password = "Password";

/* ================= EMAIL API DETAILS ================= */
const char* host = "www.circuitdigest.cloud";
const int port = 443;
const char* apiKey = "yourapikey";
const char* toEmail = "yourregismailid";
const int templateID = 1001;

/* ================= SETTINGS ================= */
const unsigned long READ_INTERVAL = 500;      // Check every 500ms for faster detection
const unsigned long RETRY_DELAY = 10000;      // 10 seconds between emails
const unsigned long DETECTION_DURATION = 2000; // Object must be detected for 2 seconds

/* ================= FLAGS AND COUNTERS ================= */
bool emailSent = false;
bool objectDetected = false;
unsigned long lastReadTime = 0;
unsigned long lastEmailAttempt = 0;
unsigned long detectionStartTime = 0;
int detectionCount = 0;
int totalDetections = 0;

/* ================= SEND EMAIL ================= */
bool sendEmail(int detections) {
 WiFiClientSecure client;
 Serial.println("\n Connecting to server...");
 // Disable SSL certificate verification (for development)
 client.setInsecure();
 if (!client.connect(host, port)) {
   Serial.println(" HTTPS connection failed");
   return false;
 }

 /* -------- BUILD COMPLETE JSON PAYLOAD -------- */
 char payload[512];
 char timestamp[32];
 unsigned long currentTime = millis() / 1000; // Convert to seconds
 snprintf(timestamp, sizeof(timestamp), "%lu seconds", currentTime);
 
 snprintf(payload, sizeof(payload),
   "{"
   "\"to_email\":\"%s\","
   "\"template_id\":%d,"
   "\"variables\":{"
     "\"subject\":\"Motion Alert from IR Sensor\","
     "\"title\":\"Object Detected!\","
     "\"description\":\"Your IR sensor detected an object in the monitoring area.\","
     "\"var1\":\"Detection Count\","
     "\"var2\":\"%d detection(s) | Runtime: %s\""
   "}}",
   toEmail, templateID, detections, timestamp
 );

 /* -------- SEND HTTP REQUEST -------- */
 client.println("POST /api/v1/email/send HTTP/1.1");
 client.print("Host: "); client.println(host);
 client.print("Authorization: "); client.println(apiKey);
 client.println("Content-Type: application/json");
 client.print("Content-Length: "); client.println(strlen(payload));
 client.println("Connection: close");
 client.println();
 client.println(payload);

 Serial.println(" Sending payload:");
 Serial.println(payload);

 /* -------- WAIT FOR RESPONSE -------- */
 unsigned long timeout = millis();
 while (!client.available()) {
   if (millis() - timeout > 10000) {
     Serial.println(" Server timeout");
     client.stop();
     return false;
   }
 }

 /* -------- READ AND PARSE RESPONSE -------- */
 bool success = false;
 Serial.println("\n Server response:");
 while (client.available()) {
   String line = client.readStringUntil('\n');
   Serial.println(line);
   if (line.indexOf("200 OK") >= 0 || line.indexOf("\"success\":true") >= 0) {
     success = true;
   }
 }
 client.stop();
 if (success) {
   Serial.println("\n Email sent successfully!");
 } else {
   Serial.println("\n Email may have failed - check response above");
 }
 return success;
}

/* ================= SETUP ================= */
void setup() {
 Serial.begin(115200);
 delay(1000);
 Serial.println("\n IR Motion Detection Alert System - Pico W");
 
 pinMode(IR_SENSOR_PIN, INPUT);
 int initialState = digitalRead(IR_SENSOR_PIN);
 
 Serial.print("Connecting to WiFi: ");
 Serial.println(ssid);
 WiFi.mode(WIFI_STA);
 WiFi.begin(ssid, password);
 
 int attempts = 0;
 while (WiFi.status() != WL_CONNECTED && attempts < 30) {
   delay(500);
   Serial.print(".");
   attempts++;
 }
 Serial.println();
 if (WiFi.status() == WL_CONNECTED) {
   Serial.println(" WiFi connected successfully!");
   Serial.print(" IP Address: ");
   Serial.println(WiFi.localIP());
 } else {
   Serial.println(" WiFi connection failed!");
 }
}

/* ================= LOOP ================= */
void loop() {
 unsigned long currentMillis = millis();
 
 if (currentMillis - lastReadTime < READ_INTERVAL) { return; }
 lastReadTime = currentMillis;

 if (WiFi.status() != WL_CONNECTED) {
   WiFi.begin(ssid, password);
   delay(5000);
   return;
 }

 int sensorState = digitalRead(IR_SENSOR_PIN);
 bool currentDetection = (sensorState == LOW);

 if (currentDetection) {
   if (!objectDetected) {
     objectDetected = true;
     detectionStartTime = currentMillis;
     totalDetections++;
     Serial.println(" OBJECT DETECTED!");
   }
   unsigned long detectionDuration = currentMillis - detectionStartTime;
   
   if (detectionDuration >= DETECTION_DURATION && !emailSent) {
     if (currentMillis - lastEmailAttempt > RETRY_DELAY) {
       lastEmailAttempt = currentMillis;
       if (sendEmail(totalDetections)) {
         emailSent = true;
       }
     }
   }
 } else {
   if (objectDetected) {
     objectDetected = false;
     emailSent = false; 
     Serial.println(" Object cleared\n");
   }
 }
}