#include <WiFi.h>
#include "DHT.h"
#include "ThingSpeak.h"

#define DHTPIN 15
#define DHTTYPE DHT22
#define LEDPIN 33
#define POTPIN 34

const char* ssid = "Wokwi-GUEST";
const char* password = "";

unsigned long channelID = 2231178; // set your real channel ID here
const char* writeAPIKey = "44G9HY60Q65XRSWC"; // set your real write API key here

DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;

void setup() {
  Serial.begin(115200);
  while(!Serial){} // wait for serial (safe in some environments)
  Serial.println("Starting diagnostic...");

  pinMode(LEDPIN, OUTPUT);
  pinMode(POTPIN, INPUT);
  dht.begin();

  // Connect WiFi
  Serial.print("Connecting to WiFi ");
  WiFi.begin(ssid, password);
  unsigned long wifiStart = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - wifiStart < 15000) {
    Serial.print(".");
    delay(500);
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi connected. IP: " + WiFi.localIP().toString());
  } else {
    Serial.println("\nWiFi connection FAILED (timeout). Check Wokwi WiFi or SSID.");
  }

  // Initialize ThingSpeak client
  ThingSpeak.begin(client);
}

void loop() {
  // Read DHT
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // Read POT as simulated heart rate
  int pot = analogRead(POTPIN);
  int heartRate = map(pot, 0, 4095, 60, 120);

  // Print sensor status
  if (isnan(temp) || isnan(hum)) {
    Serial.println("[DIAG] DHT error: temp or hum = NaN");
  } else {
    Serial.printf("[DIAG] Temp = %.2f C, Humidity = %.2f %%\n", temp, hum);
  }
  Serial.printf("[DIAG] Pot=%d → HeartRate ~ %d BPM\n", pot, heartRate);

  // Local alert check (no upload yet)
  bool alert = (!isnan(temp) && temp > 37.0) || heartRate > 100;
  digitalWrite(LEDPIN, alert ? HIGH : LOW);
  Serial.printf("[DIAG] Alert: %s | LED set %s\n", alert ? "YES" : "NO", alert ? "HIGH" : "LOW");

  // Try upload to ThingSpeak (only if WiFi connected)
  if (WiFi.status() == WL_CONNECTED) {
    ThingSpeak.setField(1, isnan(temp) ? -999 : temp);
    ThingSpeak.setField(2, isnan(hum) ? -999 : hum);
    ThingSpeak.setField(3, heartRate);
    int response = ThingSpeak.writeFields(channelID, writeAPIKey);
    Serial.printf("[DIAG] ThingSpeak writeFields response = %d\n", response);
    if (response == 200) Serial.println("[DIAG] Upload OK");
    else {
      Serial.println("[DIAG] Upload failed:");
      // print some helpful info
      if (response == 0) Serial.println("  -- No response from ThingSpeak (check network).");
      else if (response == 401) Serial.println("  -- Not authorized (check API key).");
      else if (response == 404) Serial.println("  -- Channel not found (check channel ID).");
      else Serial.println("  -- HTTP code: " + String(response));
    }
  } else {
    Serial.println("[DIAG] Skipping ThingSpeak upload (no WiFi).");
  }

  Serial.println("-------------------------------------------------");
  delay(20000); // wait 20s (ThingSpeak friendly)
}