#include "ui/apps/iotdis/app.h"
#include "ui/apps/iotdis/ui/main_handler.h"
#include "ui/apps/iotdis/ui/settings_handler.h"
#include "common/system_context.h"
#include "esp_log.h"

static const char* TAG = "IotDisApp";

// ============================================================================
// IotDisApp Implementation
// ============================================================================

IotDisApp::IotDisApp()
  : main_ui_handler_(nullptr)
  , settings_ui_handler_(nullptr)
  , current_page_(Page::MAIN)
  , setting_handler_(nullptr)
  , interaction_handler_(nullptr) {
  setting_handler_ = std::make_unique<SettingHandler>(
    std::make_unique<NVSStorageHandler>(IotDisApp::NVS_NAMESPACE)
  );
}

IotDisApp::~IotDisApp() { }

esp_err_t IotDisApp::init(lv_obj_t* container, InteractionHandler* interaction_handler) {
  ESP_LOGI(TAG, "Initializing Discord app");

  container_ = container;
  interaction_handler_ = interaction_handler;

  // Initialize storage
  setting_handler_->init(nullptr);

  // Load saved settings
  setting_handler_->load_settings();

  // Create main UI handler
  main_ui_handler_ = std::make_unique<MainUIHandler>();
  main_ui_handler_->init(container, interaction_handler_, setting_handler_.get());

  // Register settings button callback
  main_ui_handler_->register_on_settings_button_clicked(on_settings_button_clicked_static, this);

  current_page_ = Page::MAIN;

  return ESP_OK;
}

esp_err_t IotDisApp::deinit() {
  ESP_LOGI(TAG, "Deinitializing Discord app");

  // Clean up UI handlers
  if (settings_ui_handler_) {
    settings_ui_handler_->deinit();
    settings_ui_handler_.reset();
  }

  if (main_ui_handler_) {
    main_ui_handler_->deinit();
    main_ui_handler_.reset();
  }

  return ESP_OK;
}

std::string IotDisApp::get_name() const {
  return "Discord";
}

bool IotDisApp::on_back_button_pressed() {
  // If on settings page, go back to main page
  if (current_page_ == Page::SETTINGS) {
    // Clean up settings handler
    if (settings_ui_handler_) {
      settings_ui_handler_->deinit();
      settings_ui_handler_.reset();
    }

    // Reload settings in case they were updated
    setting_handler_->load_settings();

    // Recreate main UI handler with updated settings
    if (!main_ui_handler_) {
      main_ui_handler_ = std::make_unique<MainUIHandler>();
      main_ui_handler_->init(container_, interaction_handler_, setting_handler_.get());
      main_ui_handler_->register_on_settings_button_clicked(on_settings_button_clicked_static, this);
    }

    // Update UI with configuration status
    main_ui_handler_->update_config_prompt(setting_handler_->is_configured());

    current_page_ = Page::MAIN;
    return true;
  }

  // Let system handle back (return to app icons)
  return false;
}

// ============================================================================
// Private Methods
// ============================================================================

// Settings page with web server and QR code
void IotDisApp::show_settings_page() {
  ESP_LOGI(TAG, "Showing settings page");

  // Hide main UI handler
  if (main_ui_handler_) {
    main_ui_handler_->deinit();
    main_ui_handler_.reset();
  }

  // Create settings UI handler
  settings_ui_handler_ = std::make_unique<SettingsUIHandler>();
  settings_ui_handler_->init(container_, interaction_handler_, setting_handler_.get());

  current_page_ = Page::SETTINGS;
}

// ============================================================================
// Static Callbacks
// ============================================================================

void IotDisApp::on_settings_button_clicked_static(lv_event_t* e) {
  IotDisApp* app = static_cast<IotDisApp*>(lv_event_get_user_data(e));
  if (app) {
    app->show_settings_page();
  }
}