/*
 * ============================================================
 *  Tishvi ESP32-C3 Super Mini — Getting Started Sketch
 *  guide.tishvi.com
 * ============================================================
 *  Chip     : ESP32-C3 (RISC-V, single core, 160 MHz max)
 *  Bluetooth: BLE 5.0 ONLY — no Classic Bluetooth
 *
 *  ⚠ CRITICAL — Before uploading, set in Arduino IDE:
 *    Tools → Board            → ESP32C3 Dev Module
 *    Tools → USB CDC On Boot  → Enabled
 *    Tools → Upload Speed     → 921600
 *
 *  Without "USB CDC On Boot → Enabled", Serial will not
 *  output anything in the Serial Monitor.
 *
 *  Built-in LED: GPIO 8
 *  Note: On many C3 Super Mini boards the LED is active-LOW
 *        (HIGH = off, LOW = on). The sketch handles both.
 *
 *  No external libraries needed — WiFi.h is included with the
 *  ESP32 board package from Espressif.
 * ============================================================
 */

#include <WiFi.h>

// ── Pin Definitions ──────────────────────────────────────────
const int LED_PIN = 8;          // Built-in LED — GPIO 8

// Some C3 Super Mini boards have an active-LOW LED.
// If the LED stays ON and turns OFF when blinking, set this to false.
// If the LED stays OFF and turns ON when blinking, set this to true.
const bool LED_ACTIVE_HIGH = false;  // Most Super Mini boards: active-LOW

// ── Helpers ──────────────────────────────────────────────────
void ledOn()  { digitalWrite(LED_PIN, LED_ACTIVE_HIGH ? HIGH : LOW); }
void ledOff() { digitalWrite(LED_PIN, LED_ACTIVE_HIGH ? LOW  : HIGH); }

// ── Setup ────────────────────────────────────────────────────
void setup() {
  Serial.begin(115200);
  delay(1000);   // Allow USB CDC time to enumerate after power-on

  pinMode(LED_PIN, OUTPUT);
  ledOff();

  Serial.println("\n========================================");
  Serial.println("   Tishvi ESP32-C3 Super Mini");
  Serial.println("========================================");
  Serial.printf("Chip Model  : %s\n",  ESP.getChipModel());
  Serial.printf("Architecture: RISC-V (%d core)\n", ESP.getChipCores());
  Serial.printf("CPU Speed   : %d MHz\n", ESP.getCpuFreqMHz());
  Serial.printf("Flash Size  : %d MB\n",  ESP.getFlashChipSize() / 1048576);
  Serial.printf("Free Heap   : %d bytes\n", ESP.getFreeHeap());
  Serial.printf("MAC Address : %s\n",  WiFi.macAddress().c_str());
  Serial.println("Bluetooth   : BLE 5.0 only (no Classic BT)");
  Serial.println("========================================\n");

  // ── WiFi Network Scan ────────────────────────────────────
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.println("Scanning for WiFi networks (2.4 GHz only)...");
  int n = WiFi.scanNetworks();

  if (n == 0) {
    Serial.println("No networks found. Check antenna / placement.");
  } else {
    Serial.printf("%d network(s) found:\n\n", n);
    for (int i = 0; i < n; i++) {
      Serial.printf("  %2d. %-28s  %4d dBm  %s\n",
        i + 1,
        WiFi.SSID(i).c_str(),
        WiFi.RSSI(i),
        WiFi.encryptionType(i) == WIFI_AUTH_OPEN ? "[Open]" : "[Secured]"
      );
      delay(10);
    }
  }
  WiFi.scanDelete();

  Serial.println("\nBuilt-in LED (GPIO 8) blinking every 500 ms.");
  Serial.println("If LED does not blink: flip LED_ACTIVE_HIGH in sketch.");
}

// ── Loop ─────────────────────────────────────────────────────
void loop() {
  ledOn();
  delay(500);
  ledOff();
  delay(500);
}