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

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

// REPLACE THIS WITH YOUR NEW DEPLOYMENT URL (Ends in /exec)
const char* SCRIPT_URL = "https://script.google.com/macros/s/AKfycbxX9SU3DP1m9vcRi5rDnqEwG_OatYU3EWXHGgpUSkxh53KIXRwtOupyYdVM_UolxP5y/exec";

// Define the headers we want to capture
const char* headerKeys[] = {"Location"};

void setup() {
  Serial.begin(115200);
  delay(2000); 
  
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
}

void loop() {
  // 1️⃣ Create JSON payload
  StaticJsonDocument<256> doc;
  doc["rmsACVoltage"] = random(100, 200);
  doc["ChargingVoltage"] = random(10, 20);
  doc["BatteryVoltage"] = random(12, 18);

  String payload;
  serializeJson(doc, payload);
  Serial.println("\n--- Starting Request ---");
  Serial.println("Payload: " + payload);

  // 2️⃣ Setup HTTPS client
  WiFiClientSecure client;
  client.setInsecure(); 
  client.setTimeout(15000); 

  HTTPClient http;

  Serial.println("Sending POST...");
  
  if (http.begin(client, SCRIPT_URL)) { 
    
    http.addHeader("Content-Type", "application/json");
    
    // CRITICAL FIX 1: Tell library to collect the "Location" header
    http.collectHeaders(headerKeys, 1);
    
    // CRITICAL FIX 2: Disable Auto Redirects
    http.setFollowRedirects(HTTPC_DISABLE_FOLLOW_REDIRECTS); 

    int httpCode = http.POST(payload);

    if (httpCode == 302) {
      // Now this should actually return the string!
      String newUrl = http.header("Location"); 
      
      Serial.println("✔ POST Accepted! (Received 302)");
      Serial.println("  Redirecting to: " + newUrl);
      
      http.end(); // Close old connection

      if (newUrl.length() > 5) { // Basic validation
        Serial.println("  Following redirect...");
        http.begin(client, newUrl);
        
        int newCode = http.GET();
        if (newCode == 200) {
           Serial.println("✔ Final Success: " + http.getString());
        } else {
           Serial.print("❌ Redirect Failed. Code: ");
           Serial.println(newCode);
           Serial.println("Response: " + http.getString());
        }
        http.end(); 
      } else {
        Serial.println("❌ Error: 'Location' header was empty or invalid.");
      }
    } 
    else if (httpCode == 200) {
       Serial.println("✔ Success (No redirect): " + http.getString());
       http.end();
    } 
    else {
       Serial.print("❌ HTTP Error: ");
       Serial.println(httpCode);
       if(httpCode > 0) Serial.println("Response: " + http.getString());
       http.end();
    }
    
  } else {
    Serial.println("Unable to connect to server");
  }

  Serial.println("Waiting 10 seconds...");
  delay(10000); 
}























// #include <WiFi.h>
// #include <HTTPClient.h>
// #include <ArduinoJson.h>
// #include <WiFiClientSecure.h>

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

// // Use the "exec" deployment URL of your Google Apps Script
// const char* SCRIPT_URL = "https://script.google.com/macros/s/AKfycbypZ7ctJCJQozt5PAYS48EzttFf6JhDQqDo482stLQPMRclpYKR7ncfqSqSLS3QErG1Ww/exec";

// void setup() {
//   Serial.begin(115200);
//   Serial.println("Connecting to Wi-Fi...");
//   WiFi.begin(ssid, password);

//   while (WiFi.status() != WL_CONNECTED) {
//     delay(500);
//     Serial.print(".");
//   }
//   Serial.println("\nWiFi connected!");
//   Serial.print("IP address: ");
//   Serial.println(WiFi.localIP());
// }

// void loop() 
// {
//   // 1️⃣ Create JSON payload
//   StaticJsonDocument<256> doc;
//   doc["rmsACVoltage"] = random(100, 200);
//   doc["ChargingVoltage"] = random(10, 20);
//   doc["BatteryVoltage"] = random(12, 18);

//   String payload;
//   serializeJson(doc, payload);
//   Serial.println("Sending payload: " + payload);

//   // 2️⃣ Setup HTTPS client
//   WiFiClientSecure client;
//   client.setInsecure();  // Trust Google without certificate

//   HTTPClient http;
//   http.begin(client, SCRIPT_URL);
//   http.addHeader("Content-Type", "application/json");
  
//   // ====================================================================
//   // THE FIX: Use STRICT mode to let the library handle the redirect.
//   // This mode correctly switches from POST to GET, which HTTPC_FORCE
//   // often fails to do.
//   http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
//   // ====================================================================

//   // 3️⃣ POST request (The library will now handle the 302->GET chain)
//   int httpCode = http.POST(payload);

//   if (httpCode > 0) {
//     Serial.print("HTTP Response Code: ");
//     Serial.println(httpCode);
//     String response = http.getString();

//     // The final code should be 200 OK after the redirect is handled.
//     if (httpCode == 200) {
//       Serial.println("Final Response: " + response);
//       StaticJsonDocument<128> respDoc;
//       DeserializationError err = deserializeJson(respDoc, response);

//       if (!err) {
//         const char* status = respDoc["status"];
//         const char* message = respDoc["message"];

//         if (status) {
//           if (strcmp(status, "success") == 0) Serial.println("✔ Server acknowledged success!");
//           else if (strcmp(status, "warning") == 0) Serial.print("⚠ Server warning: "), Serial.println(message ? message : "No message");
//           else if (strcmp(status, "error") == 0) Serial.print("❌ Server error: "), Serial.println(message ? message : "No message");
//           else Serial.println("⚠ Unexpected server status!");
//         }
//       } else {
//         Serial.println("⚠ Failed to parse server JSON response!");
//       }
//     } else {
//       Serial.println("⚠ Server returned non-JSON response:");
//       Serial.println(response);
//     }
//   } else {
//     Serial.print("HTTP Request failed: ");
//     Serial.println(http.errorToString(httpCode));
//   }

//   http.end();
//   delay(10000); // Wait 10 seconds before sending next payload
// }