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+// SPDX-FileCopyrightText: 2025  Amal Mazrah <mazrah@ruc.dk>
+// SPDX-FileCopyrightText: 2025  Jonas Smedegaard <dr@jones.dk>
+// SPDX-FileCopyrightText: 2025  Mennatullah Hatim Kassim <stud-mennatulla@ruc.dk>
+// SPDX-FileCopyrightText: 2025  Noor Ahmad <noora@ruc.dk>
+// SPDX-FileCopyrightText: 2025  Tanishka Suwalka <tanishkas@ruc.dk>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/// Mussel vote - an Arduino sketch to monitor mussel biosensors
+///
+/// @version 0.0.3
+/// @see <https://app.radicle.xyz/nodes/seed.radicle.garden/rad:z2tFBF4gN7ziG9oXtUytVQNYe3VhQ>
+/// @see <https://moodle.ruc.dk/course/view.php?id=23504>
+
+// arduino-esp32 Logging system
+// activate in Arduino IDE: Tools -> Core Debug Level
+// special: set Core Debug Level to Error for plot-friendly output
+#define CONFIG_ARDUHAL_ESP_LOG 1
+#define LOG_LOCAL_LEVEL CORE_DEBUG_LEVEL
+#include <esp32-hal-log.h>
+#undef ARDUHAL_LOG_FORMAT
+#define ARDUHAL_LOG_FORMAT(letter, format) \
+ ARDUHAL_LOG_COLOR_##letter "[" #letter "] %s(): " format \
+ ARDUHAL_LOG_RESET_COLOR "\r\n", __FUNCTION__
+
+// arduino-esp32 Bluetooth Low Energy (BLE) networking stack
+#include <BLEDevice.h>
+#include <BLEScan.h>
+#include <BLEAdvertisedDevice.h>
+#include <BLEEddystoneTLM.h>
+#include <BLEBeacon.h>
+
+#define MUSSEL_VOTE_TIME_AHEAD 60000U  // 1 minute
+#define MUSSEL_VOTE_TIME_BEHIND 120000U  // 2 minutes
+
+// Limited size NOW!! can be transformed into infinite array
+#define STACK_SIZE 1000
+
+struct Vote {
+  String id;
+  unsigned long timestamp;
+  int measure;
+};
+
+void begin();
+String desc();
+int read();
+String debug();
+bool push(String id, unsigned long timestamp, int measure);
+void printStack();
+bool qualifyVote(Vote vote, unsigned long currentTime);
+
+int _attitude;
+int _pin;
+bool _boolState;
+byte _count;
+unsigned long _time;
+
+// Array to store ID strings
+String idStack[STACK_SIZE]; 
+unsigned long timeStack[STACK_SIZE];
+int measureStack[STACK_SIZE];
+
+// Index of the top element in the stack, -1 means stack is empty
+int top = -1;
+
+int scanTime = 1;  //In seconds
+
+// pointer to control Bluetooth networking
+BLEScan *pBLEScan;
+
+// Bluetooth beacon discovery callbacks
+class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
+
+  // decode name and temperature from Eddystone TLM advertisement
+  void onResult(BLEAdvertisedDevice advertisedDevice) {
+    if (advertisedDevice.haveName()
+      && advertisedDevice.getFrameType() == BLE_EDDYSTONE_TLM_FRAME
+    ) {
+      BLEEddystoneTLM EddystoneTLM(&advertisedDevice);
+      push(
+        advertisedDevice.getName(),
+        millis(),
+        EddystoneTLM.getTemp()
+      );
+    }
+  }
+};
+
+/// Function to push data onto the stack
+bool push(String id, unsigned long timestamp, int measure) {
+
+  // Check if stack is full
+  if (top >= STACK_SIZE - 1) {
+    Serial.println("Stack Full");
+
+    // Return false if stack is full
+    return false;
+  }
+  top++;
+  idStack[top] = id;
+  timeStack[top] = timestamp;
+  measureStack[top] = measure;
+
+  // Return true on successful push
+  return true;
+}
+
+/// Function to print stack contents
+void printStack() {
+  for (int i = top; i >= 0; i--) {
+    Serial.print("ID: "); Serial.print(idStack[i]);
+    Serial.print(", Time: "); Serial.print(timeStack[i]);
+    Serial.print(", measure: "); Serial.println(measureStack[i]);
+  }
+}
+
+bool qualifyVote(Vote vote, unsigned long currentTime) {
+
+  // If the measure is 42 (YES), check timestamp validity
+  if (vote.measure == 42) {
+    // If the vote's timestamp is within 1 minute, count it as YES
+    if (currentTime - vote.timestamp <= MUSSEL_VOTE_TIME_AHEAD) {
+      return true;
+    }
+    // If the vote's timestamp is older than 2 minutes, count it as NO
+    else if (currentTime - vote.timestamp > MUSSEL_VOTE_TIME_BEHIND) {
+      return false;
+    }
+  }
+
+  // If the measure is 2, always count the vote as NO
+  if (vote.measure == 2) {
+    return false;
+  }
+
+  // Default case: vote is invalid if no conditions are met
+  return false;
+}
+
+/// Dump internal variables, formatted for use with Serial Plotter
+///
+/// @return  internal variables as String
+String debug() {
+  return static_cast<String>(
+    "pin:") + _pin
+    + "\tboolState:" + _boolState
+    + "\ttime:" + _time
+    + "\tcount:" + _count;
+}
+
+void setup() {
+  // enable logging to serial
+  Serial.begin(115200);
+  esp_log_level_set("*", ESP_LOG_DEBUG);
+
+  // setup Bluetooth
+  BLEDevice::init("");
+  pBLEScan = BLEDevice::getScan();
+  pBLEScan->setAdvertisedDeviceCallbacks(
+    new MyAdvertisedDeviceCallbacks());
+  pBLEScan->setActiveScan(true);
+  pBLEScan->setInterval(100);
+  pBLEScan->setWindow(99);
+}
+
+void loop() {
+  BLEScanResults *foundDevices = pBLEScan->start(scanTime, false);
+  pBLEScan->clearResults();
+
+  printStack();
+
+  delay(500);
+}