Jola Device Controller

#include <WiFi.h>
#include <WebServer.h>
#include <SPI.h>
#include <MFRC522.h>
#include <ESP32Servo.h>

constexpr uint8_t RFID_SS_PIN = 4;
constexpr uint8_t RFID_RST_PIN = 27;
constexpr uint8_t LED_GREEN_PIN = 32;
constexpr uint8_t LED_RED_PIN = 33;
constexpr uint8_t KEY_SENSOR_PIN = 14;
constexpr uint8_t LID_SENSOR_PIN = 13;
constexpr uint8_t SERVO_PIN = 25;
constexpr int SERVO_LOCKED = 10;
constexpr int SERVO_UNLOCKED = 100;

const char *AP_SSID = "LlaveLink";
const char *AP_PASSWORD = "LlaveLink2026";

MFRC522 rfid(RFID_SS_PIN, RFID_RST_PIN);
Servo lockServo;
WebServer server(80);

bool loanApproved = false;
bool unlocked = false;
bool lastKeyPresent = false;
bool lastLidOpen = false;

void setLock(bool open) {
  unlocked = open;
  lockServo.write(open ? SERVO_UNLOCKED : SERVO_LOCKED);
  digitalWrite(LED_GREEN_PIN, open ? HIGH : LOW);
  digitalWrite(LED_RED_PIN, open ? LOW : HIGH);
}

String statusText() {
  bool keyPresent = digitalRead(KEY_SENSOR_PIN) == HIGH;
  bool lidOpen = digitalRead(LID_SENSOR_PIN) == HIGH;
  String text = "Préstamo: ";
  text += loanApproved ? "aprobado" : "pendiente";
  text += " | Llave: ";
  text += keyPresent ? "en soporte" : "retirada";
  text += " | Tapa: ";
  text += lidOpen ? "abierta" : "cerrada";
  return text;
}

void sendPage() {
  String page = "<!doctype html><html><meta name='viewport' content='width=device-width,initial-scale=1'>";
  page += "<style>body{font-family:Arial;margin:28px;color:#17324d}button{display:block;width:100%;padding:16px;margin:12px 0;font-size:18px;border:0;border-radius:8px;background:#1677c8;color:white}</style>";
  page += "<h1>LlaveLink</h1><p>" + statusText() + "</p>";
  page += "<form action='/request'><button>Solicitar llave</button></form>";
  page += "<form action='/approve'><button>Aprobar préstamo</button></form>";
  page += "<form action='/history'><button>Historial</button></form></html>";
  server.send(200, "text/html; charset=utf-8", page);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_GREEN_PIN, OUTPUT);
  pinMode(LED_RED_PIN, OUTPUT);
  pinMode(KEY_SENSOR_PIN, INPUT_PULLUP);
  pinMode(LID_SENSOR_PIN, INPUT_PULLUP);

  lockServo.setPeriodHertz(50);
  lockServo.attach(SERVO_PIN, 500, 2400);
  setLock(false);

  SPI.begin();
  rfid.PCD_Init();

  WiFi.softAP(AP_SSID, AP_PASSWORD);
  server.on("/", sendPage);
  server.on("/request", []() { loanApproved = false; server.sendHeader("Location", "/"); server.send(303); });
  server.on("/approve", []() { loanApproved = true; server.sendHeader("Location", "/"); server.send(303); });
  server.on("/history", []() { server.send(200, "text/plain; charset=utf-8", "Historial conceptual: " + statusText()); });
  server.begin();

  lastKeyPresent = digitalRead(KEY_SENSOR_PIN) == HIGH;
  lastLidOpen = digitalRead(LID_SENSOR_PIN) == HIGH;
  Serial.println("LlaveLink listo. Conéctate a la red Wi-Fi LlaveLink.");
}

void loop() {
  server.handleClient();

  bool keyPresent = digitalRead(KEY_SENSOR_PIN) == HIGH;
  bool lidOpen = digitalRead(LID_SENSOR_PIN) == HIGH;
  if (keyPresent != lastKeyPresent || lidOpen != lastLidOpen) {
    lastKeyPresent = keyPresent;
    lastLidOpen = lidOpen;
    Serial.println(statusText());
  }

  if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()) {
    if (loanApproved) {
      setLock(true);
      Serial.println("Tarjeta RFID aceptada: pestillo liberado.");
    } else {
      digitalWrite(LED_RED_PIN, HIGH);
      delay(200);
      digitalWrite(LED_RED_PIN, LOW);
      Serial.println("Tarjeta RFID leída: préstamo pendiente de aprobación.");
    }
    rfid.PICC_HaltA();
    rfid.PCD_StopCrypto1();
  }

  delay(10);
}