// Audio buffer (PSRAM)
int16_t* record_buffer = nullptr;
size_t record_size = 0;
const size_t MAX_REC = 1024 * 500;
const int SAMPLE_RATE = 16000;

// JWT + endpoint
const char* API_KEY = "JWT_API_KEY";
const char* API_END_POINT
  = "http://localhost:8000";

// Dialog ring buffer
struct Dialog {
  String userText;
  String aiResponse;
  unsigned long ts;
};
const int MAX_DIALOGS = 10;
Dialog history[MAX_DIALOGS];
int dialogCount = 0;
int currentView = 0;

String sttRequest() {
  HTTPClient http;
  String url =
    String(API_END_POINT) + "/stt";
  http.begin(url);
  http.addHeader(
    "Authorization",
    String("Bearer ") + API_KEY);
  http.addHeader(
    "Content-Type",
    "application/octet-stream");

  int code = http.POST(
    (uint8_t*)record_buffer,
    record_size);

  if (code == HTTP_CODE_OK) {
    String res = http.getString();
    JsonDocument doc;
    deserializeJson(doc, res);
    http.end();
    if (!doc["text"].isNull())
      return doc["text"];
  }
  http.end();
  return "";
}

String chatRequest(String input) {
  HTTPClient http;
  String url =
    String(API_END_POINT) + "/chat";
  http.begin(url);
  http.addHeader("Authorization",
    String("Bearer ") + API_KEY);
  http.addHeader(
    "Content-Type",
    "application/json");

  JsonDocument req;
  req["text"] = input;
  String payload;
  serializeJson(req, payload);

  int code = http.POST(payload);
  if (code == HTTP_CODE_OK) {
    JsonDocument doc;
    deserializeJson(doc,
      http.getString());
    http.end();
    return doc["response"];
  }
  http.end();
  return "Error.";
}

void addDialog(
  String userText,
  String aiResponse) {

  if (dialogCount < MAX_DIALOGS) {
    history[dialogCount]
      .userText = userText;
    history[dialogCount]
      .aiResponse = aiResponse;
    history[dialogCount]
      .ts = millis();
    dialogCount++;
  } else {
    // shift oldest out
    for (int i=0;
         i<MAX_DIALOGS-1; i++) {
      history[i]
        = history[i+1];
    }
    history[MAX_DIALOGS-1]
      .userText = userText;
  }
  currentView = dialogCount-1;
}

[env:m5stick-c]
platform = espressif32
board = m5stick-c
framework = arduino
board_build.f_cpu = 240000000L
board_upload.flash_size = 8MB
board_build.partitions
  = default_8MB.csv

build_flags =
  -DBOARD_HAS_PSRAM
  -mfix-esp32-psram-cache-issue

lib_deps =
  m5stack/M5Unified@^0.1.14
  tzapu/WiFiManager
  bblanchon/ArduinoJson@^7.0.4
  earlephilhower/ESP8266Audio
  bitbank2/AnimatedGIF@^2.0.1