#include <WiFiSettingsService.h>

WiFiSettingsService::WiFiSettingsService(AsyncWebServer* server, FS* fs, SecurityManager* securityManager) :
    _httpEndpoint(WiFiSettings::read, WiFiSettings::update, this, server, WIFI_SETTINGS_SERVICE_PATH, securityManager),
    _fsPersistence(WiFiSettings::read, WiFiSettings::update, this, fs, WIFI_SETTINGS_FILE),
    _lastConnectionAttempt(0) {
  // We want the device to come up in opmode=0 (WIFI_OFF), when erasing the flash this is not the default.
  // If needed, we save opmode=0 before disabling persistence so the device boots with WiFi disabled in the future.
  if (WiFi.getMode() != WIFI_OFF) {
    WiFi.mode(WIFI_OFF);
  }

  // Disable WiFi config persistance and auto reconnect
  WiFi.persistent(false);
  WiFi.setAutoReconnect(false);
#ifdef ESP32
  // Init the wifi driver on ESP32
  WiFi.mode(WIFI_MODE_MAX);
  WiFi.mode(WIFI_MODE_NULL);
  WiFi.onEvent(
      std::bind(&WiFiSettingsService::onStationModeDisconnected, this, std::placeholders::_1, std::placeholders::_2),
      WiFiEvent_t::SYSTEM_EVENT_STA_DISCONNECTED);
  WiFi.onEvent(std::bind(&WiFiSettingsService::onStationModeStop, this, std::placeholders::_1, std::placeholders::_2),
               WiFiEvent_t::SYSTEM_EVENT_STA_STOP);
#elif defined(ESP8266)
  _onStationModeDisconnectedHandler = WiFi.onStationModeDisconnected(
      std::bind(&WiFiSettingsService::onStationModeDisconnected, this, std::placeholders::_1));
#endif

  addUpdateHandler([&](const String& originId) { reconfigureWiFiConnection(); }, false);
}

void WiFiSettingsService::begin() {
  _fsPersistence.readFromFS();
  reconfigureWiFiConnection();
}

void WiFiSettingsService::reconfigureWiFiConnection() {
  // reset last connection attempt to force loop to reconnect immediately
  _lastConnectionAttempt = 0;

// disconnect and de-configure wifi
#ifdef ESP32
  if (WiFi.disconnect(true)) {
    _stopping = true;
  }
#elif defined(ESP8266)
  WiFi.disconnect(true);
#endif
}

void WiFiSettingsService::loop() {
  unsigned long currentMillis = millis();
  if (!_lastConnectionAttempt || (unsigned long)(currentMillis - _lastConnectionAttempt) >= WIFI_RECONNECTION_DELAY) {
    _lastConnectionAttempt = currentMillis;
    manageSTA();
  }
}

void WiFiSettingsService::manageSTA() {
  // Abort if already connected, or if we have no SSID
  if (WiFi.isConnected() || _state.ssid.length() == 0) {
    return;
  }
  // Connect or reconnect as required
  if ((WiFi.getMode() & WIFI_STA) == 0) {
    Serial.println(F("Connecting to WiFi."));
    if (_state.staticIPConfig) {
      // configure for static IP
      WiFi.config(_state.localIP, _state.gatewayIP, _state.subnetMask, _state.dnsIP1, _state.dnsIP2);
    } else {
      // configure for DHCP
#ifdef ESP32
      WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);
      WiFi.setHostname(_state.hostname.c_str());
#elif defined(ESP8266)
      WiFi.config(INADDR_ANY, INADDR_ANY, INADDR_ANY);
      WiFi.hostname(_state.hostname);
#endif
    }
    // attempt to connect to the network
    WiFi.begin(_state.ssid.c_str(), _state.password.c_str());
  }
}

#ifdef ESP32
void WiFiSettingsService::onStationModeDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
  WiFi.disconnect(true);
}
void WiFiSettingsService::onStationModeStop(WiFiEvent_t event, WiFiEventInfo_t info) {
  if (_stopping) {
    _lastConnectionAttempt = 0;
    _stopping = false;
  }
}
#elif defined(ESP8266)
void WiFiSettingsService::onStationModeDisconnected(const WiFiEventStationModeDisconnected& event) {
  WiFi.disconnect(true);
}
#endif