// --- A.I.L.Y.N display config: paste into TFT_eSPI/User_Setup.h ---
#define ST7735_DRIVER
#define TFT_WIDTH   128
#define TFT_HEIGHT  160
#define ST7735_GREENTAB      // wrong colours/offset? try REDTAB, BLACKTAB, GREENTAB2, GREENTAB3

#define TFT_MISO   -1
#define TFT_MOSI   11        // SDA
#define TFT_SCLK   12        // SCL
#define TFT_CS     10
#define TFT_DC      9        // DC / A0 / RS
#define TFT_RST     8        // RES
#define TFT_BL     -1        // backlight tied to 3V3, not a GPIO

#define LOAD_GLCD
#define LOAD_FONT2
#define LOAD_FONT4
#define LOAD_GFXFF
#define SMOOTH_FONT
#define SPI_FREQUENCY  27000000

/*  A.I.L.Y.N — Stage 1: Display test
    You should see the name and "DISPLAY OK" in green.
    Colours wrong or shifted? Change the tab colour in User_Setup.h.  */
#include <TFT_eSPI.h>

TFT_eSPI tft = TFT_eSPI();

void setup() {
  tft.init();
  tft.setRotation(1);                 // landscape 160x128
  tft.fillScreen(TFT_BLACK);

  tft.setTextColor(TFT_GREEN, TFT_BLACK);
  tft.setTextSize(2);
  tft.setCursor(8, 16);
  tft.println("A.I.L.Y.N");

  tft.setTextSize(1);
  tft.setTextColor(TFT_CYAN, TFT_BLACK);
  tft.setCursor(8, 48);
  tft.println("DISPLAY OK");

  tft.drawRect(4, 4, tft.width() - 8, tft.height() - 8, TFT_ORANGE);
}

void loop() {}

/*  A.I.L.Y.N — Stage 2: Microphone test (ICS-43434)
    Open Serial Monitor at 115200. The bar should jump when you speak.  */
#include <driver/i2s.h>

#define MIC_SCK   4     // BCLK
#define MIC_WS    15    // LRCL
#define MIC_SD    16    // DOUT
#define MIC_PORT  I2S_NUM_0

void micBegin() {
  i2s_config_t cfg = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = 16000,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,   // SEL wired to GND
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 4,
    .dma_buf_len = 256,
    .use_apll = false
  };
  i2s_pin_config_t pins = {
    .bck_io_num = MIC_SCK, .ws_io_num = MIC_WS,
    .data_out_num = I2S_PIN_NO_CHANGE, .data_in_num = MIC_SD
  };
  i2s_driver_install(MIC_PORT, &cfg, 0, NULL);
  i2s_set_pin(MIC_PORT, &pins);
}

void setup() {
  Serial.begin(115200);
  delay(400);
  micBegin();
  Serial.println("Mic ready - make some noise.");
}

void loop() {
  const int N = 256;
  int32_t buf[N];
  size_t bytesRead = 0;
  i2s_read(MIC_PORT, buf, sizeof(buf), &bytesRead, portMAX_DELAY);
  int samples = bytesRead / sizeof(int32_t);

  long peak = 0;
  for (int i = 0; i < samples; i++) {
    int32_t s = buf[i] >> 14;          // 24-bit sample, left-justified
    peak = max(peak, (long)abs(s));
  }
  int bars = map(min(peak, 30000L), 0, 30000, 0, 40);
  Serial.print('[');
  for (int i = 0; i < 40; i++) Serial.print(i < bars ? '#' : ' ');
  Serial.print("] ");
  Serial.println(peak);
  delay(50);
}

/*  A.I.L.Y.N — Stage 3: Speaker test (MAX98357A)
    You should hear a short 440 Hz beep about once a second.  */
#include <driver/i2s.h>
#include <math.h>

#define AMP_BCLK  5
#define AMP_LRC   6
#define AMP_DIN   7
#define AMP_PORT  I2S_NUM_1
#define SR        16000

void ampBegin() {
  i2s_config_t cfg = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
    .sample_rate = SR,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = 256,
    .use_apll = false,
    .tx_desc_auto_clear = true
  };
  i2s_pin_config_t pins = {
    .bck_io_num = AMP_BCLK, .ws_io_num = AMP_LRC,
    .data_out_num = AMP_DIN, .data_in_num = I2S_PIN_NO_CHANGE
  };
  i2s_driver_install(AMP_PORT, &cfg, 0, NULL);
  i2s_set_pin(AMP_PORT, &pins);
}

void playTone(float freq, int ms) {
  int n = SR * ms / 1000;
  for (int i = 0; i < n; i++) {
    int16_t s = (int16_t)(3000 * sinf(2 * PI * freq * i / SR));
    size_t w;
    i2s_write(AMP_PORT, &s, sizeof(s), &w, portMAX_DELAY);
  }
}

void setup() {
  Serial.begin(115200);
  ampBegin();
}

void loop() {
  playTone(440, 200);
  i2s_zero_dma_buffer(AMP_PORT);
  delay(800);
}

/*  A.I.L.Y.N — Stage 4: assistant loop (scaffold)
    Combine stages 1-3, then fill in the cloud calls.  */
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <HTTPClient.h>

const char* WIFI_SSID = "your-network";
const char* WIFI_PASS = "your-password";
const char* API_KEY   = "your-api-key";   // keep secret - don't commit to GitHub

void setup() {
  Serial.begin(115200);
  // micBegin(); ampBegin(); tft.init();   // from stages 1-3
  WiFi.begin(WIFI_SSID, WIFI_PASS);
  while (WiFi.status() != WL_CONNECTED) { delay(300); Serial.print('.'); }
  Serial.println("\nOnline.");
}

void loop() {
  // 1. idle: wait for the wake word (ESP-SR WakeNet) or a KY-037 / button trigger
  // 2. record ~3-5 s from the mic  =>  WAV buffer in PSRAM
  // 3. POST audio to speech-to-text =>  text
  // 4. POST text to the LLM         =>  reply   (show it on the display)
  // 5. POST reply to text-to-speech =>  PCM/WAV  (ask for PCM to skip decoding)
  // 6. stream that audio to the MAX98357A
  // 7. back to idle
}