/**
 *   ESP32 SvelteKit
 *
 *   A simple, secure and extensible framework for IoT projects for ESP32 platforms
 *   with responsive Sveltekit front-end built with TailwindCSS and DaisyUI.
 *   https://github.com/theelims/ESP32-sveltekit
 *
 *   Copyright (C) 2018 - 2023 rjwats
 *   Copyright (C) 2023 theelims
 *
 *   All Rights Reserved. This software may be modified and distributed under
 *   the terms of the LGPL v3 license. See the LICENSE file for details.
 **/

#include <APSettingsService.h>

static const char *TAG = "APSettingsService";

APSettingsService::APSettingsService(PsychicHttpServer *server, FS *fs, SecurityManager *securityManager)
    : _server(server),
      _securityManager(securityManager),
      _httpEndpoint(APSettings::read, APSettings::update, this, server, AP_SETTINGS_SERVICE_PATH, securityManager),
      _fsPersistence(APSettings::read, APSettings::update, this, fs, AP_SETTINGS_FILE),
      _dnsServer(nullptr),
      _lastManaged(0),
      _reconfigureAp(false) {
    addUpdateHandler([&](const String &originId) { reconfigureAP(); }, false);
}

void APSettingsService::begin() {
    _httpEndpoint.begin();
    _fsPersistence.readFromFS();
    reconfigureAP();
}

void APSettingsService::reconfigureAP() {
    _lastManaged = millis() - MANAGE_NETWORK_DELAY;
    _reconfigureAp = true;
    _recoveryMode = false;
}

void APSettingsService::recoveryMode() {
    ESP_LOGI(TAG, "Recovery Mode needed");
    _lastManaged = millis() - MANAGE_NETWORK_DELAY;
    _recoveryMode = true;
    _reconfigureAp = true;
}

void APSettingsService::loop() {
    EXECUTE_EVERY_N_MS(MANAGE_NETWORK_DELAY, manageAP());
    handleDNS();
}

void APSettingsService::manageAP() {
    WiFiMode_t currentWiFiMode = WiFi.getMode();
    if (_state.provisionMode == AP_MODE_ALWAYS ||
        (_state.provisionMode == AP_MODE_DISCONNECTED && WiFi.status() != WL_CONNECTED) || _recoveryMode) {
        if (_reconfigureAp || currentWiFiMode == WIFI_OFF || currentWiFiMode == WIFI_STA) {
            startAP();
        }
    } else if ((currentWiFiMode == WIFI_AP || currentWiFiMode == WIFI_AP_STA) &&
               (_reconfigureAp || !WiFi.softAPgetStationNum())) {
        stopAP();
    }
    _reconfigureAp = false;
}

void APSettingsService::startAP() {
    ESP_LOGI(TAG, "Starting software access point");
    WiFi.softAPConfig(_state.localIP, _state.gatewayIP, _state.subnetMask);
    WiFi.softAP(_state.ssid.c_str(), _state.password.c_str(), _state.channel, _state.ssidHidden, _state.maxClients);
#if CONFIG_IDF_TARGET_ESP32C3
    WiFi.setTxPower(WIFI_POWER_8_5dBm); // https://www.wemos.cc/en/latest/c3/c3_mini_1_0_0.html#about-wifi
#endif
    if (!_dnsServer) {
        IPAddress apIp = WiFi.softAPIP();
        ESP_LOGI(TAG, "Starting captive portal on %s", apIp.toString().c_str());
        _dnsServer = new DNSServer;
        _dnsServer->start(DNS_PORT, "*", apIp);
    }
}

void APSettingsService::stopAP() {
    if (_dnsServer) {
        ESP_LOGI(TAG, "Stopping captive portal");
        _dnsServer->stop();
        delete _dnsServer;
        _dnsServer = nullptr;
    }
    ESP_LOGI(TAG, "Stopping AP");
    WiFi.softAPdisconnect(true);
}

void APSettingsService::handleDNS() {
    if (_dnsServer) {
        _dnsServer->processNextRequest();
    }
}

APNetworkStatus APSettingsService::getAPNetworkStatus() {
    WiFiMode_t currentWiFiMode = WiFi.getMode();
    bool apActive = currentWiFiMode == WIFI_AP || currentWiFiMode == WIFI_AP_STA;
    if (apActive && _state.provisionMode != AP_MODE_ALWAYS && WiFi.status() == WL_CONNECTED) {
        return APNetworkStatus::LINGERING;
    }
    return apActive ? APNetworkStatus::ACTIVE : APNetworkStatus::INACTIVE;
}
