#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

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

// Paste EXACT web app URL here (no spaces or comments on this line)
String SCRIPT_URL = "https://script.google.com/macros/s/AKfycbzLEeCUOEpxtO8K5HOEu9izVCmW793W_AdY269AFeKMs6DcWwvaX6xaZran6p0K55mfIw/exec";

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROWS = 4, COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {13, 12, 14, 27};
byte colPins[COLS] = {26, 25, 33, 32};
Keypad kpd = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

#define GROUP_BTN 2
#define ASSET_BTN 0
#define BUZZER    4

String groupUID = "";
String assetUID = "";
String mode = "";
int qty = 0;

void setup() {
  Serial.begin(115200);
  pinMode(GROUP_BTN, INPUT_PULLUP);
  pinMode(ASSET_BTN, INPUT_PULLUP);
  pinMode(BUZZER, OUTPUT);

  lcd.init();
  lcd.backlight();
  lcd.print("RFID Lab Init...");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.println("WiFi OK: " + WiFi.localIP().toString());
  lcd.clear();
  lcd.print("WiFi Ready");
  delay(1500);
  lcd.clear();
  lcd.print("Scan + Enter");
}

void loop() {
  char key = kpd.getKey();

  if (key == 'A') {
    mode = "Issue";
    lcd.setCursor(0, 1);
    lcd.print("Mode:Issue  ");
  } else if (key == 'B') {
    mode = "Return";
    lcd.setCursor(0, 1);
    lcd.print("Mode:Return ");
  } else if (key >= '0' && key <= '9') {
    qty = (qty * 10) + (key - '0');
    lcd.setCursor(0, 1);
    lcd.print("Qty:");
    lcd.print(qty);
    lcd.print("      ");
  }

  if (digitalRead(GROUP_BTN) == LOW) {
    groupUID = "GROUP_LEADER_01";
    Serial.println("Group UID: " + groupUID);
    beep(1000, 200);
    delay(300);
  }

  if (digitalRead(ASSET_BTN) == LOW) {
    assetUID = "ASSET_OSCILLOSCOPE";
    Serial.println("Asset UID: " + assetUID);
    beep(1500, 200);
    delay(300);
  }

  if (!groupUID.isEmpty() && !assetUID.isEmpty() && !mode.isEmpty() && qty > 0) {
    sendToSheets();
    resetVars();
  }

  delay(100);
}

void sendToSheets() {
  String uidCombined = groupUID + "_" + assetUID;

  String url = SCRIPT_URL;
  url += "?uid=" + uidCombined;
  url += "&mode=" + mode;
  url += "&qty=" + String(qty);
  url += "&group=ETC_Group5";

  Serial.println("Request URL: " + url);

  HTTPClient http;
  http.begin(url);
  http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
  int httpCode = http.GET();
  Serial.println("HTTP code: " + String(httpCode));
  http.end();

  lcd.clear();
  lcd.print("Logged: " + mode);
  beep(2000, 400);
}

void resetVars() {
  groupUID = "";
  assetUID = "";
  mode = "";
  qty = 0;
  lcd.clear();
  lcd.print("Scan + Enter");
}

void beep(int freq, int dur) {
  tone(BUZZER, freq, dur);
}