Xteink-X4-crosspoint-reader/lib/ExternalFont/FontManager.h

#pragma once

#include <cstdint>

#include "ExternalFont.h"

/**
 * Font information structure
 */
struct FontInfo {
  char filename[64]; // Full filename
  char name[32];     // Font name
  uint8_t size;      // Font size (pt)
  uint8_t width;     // Character width
  uint8_t height;    // Character height
};

/**
 * Font Manager - Singleton pattern
 * Manages font scanning, selection, and settings persistence
 * Supports two font slots: Reader font (for book content) and UI font (for
 * menus/titles)
 */
class FontManager {
public:
  static FontManager &getInstance();

  // Disable copy
  FontManager(const FontManager &) = delete;
  FontManager &operator=(const FontManager &) = delete;

  /**
   * Scan /fonts/ directory to get available font list
   */
  void scanFonts();

  /**
   * Get font count
   */
  int getFontCount() const { return _fontCount; }

  /**
   * Get font info
   * @param index Font index (0 to getFontCount()-1)
   */
  const FontInfo *getFontInfo(int index) const;

  /**
   * Select reader font (for book content)
   * @param index Font index, -1 means disable external font (use built-in)
   */
  void selectFont(int index);

  /**
   * Select UI font (for menus, titles, etc.)
   * @param index Font index, -1 means disable (fallback to reader font or
   * built-in)
   */
  void selectUiFont(int index);

  /**
   * Get currently selected reader font index
   * @return -1 means using built-in font
   */
  int getSelectedIndex() const { return _selectedIndex; }

  /**
   * Get currently selected UI font index
   * @return -1 means using reader font fallback
   */
  int getUiSelectedIndex() const { return _selectedUiIndex; }

  /**
   * Get currently active reader font
   * @return Font pointer, nullptr if not enabled
   */
  ExternalFont *getActiveFont();

  /**
   * Get currently active UI font
   * @return Font pointer, nullptr if not enabled (will fallback to reader font)
   */
  ExternalFont *getActiveUiFont();

  /**
   * Check if external reader font is enabled
   */
  bool isExternalFontEnabled() const {
    return _selectedIndex >= 0 && _activeFont.isLoaded();
  }

  /**
   * Check if external UI font is enabled
   */
  bool isUiFontEnabled() const {
    return _selectedUiIndex >= 0 && _activeUiFont.isLoaded();
  }

  /**
   * Save settings to SD card
   */
  void saveSettings();

  /**
   * Load settings from SD card
   */
  void loadSettings();

private:
  FontManager() = default;

  static constexpr int MAX_FONTS = 16;
  static constexpr const char *FONTS_DIR = "/fonts";
  static constexpr const char *SETTINGS_FILE = "/.crosspoint/font_settings.bin";
  static constexpr uint8_t SETTINGS_VERSION = 2; // Bumped for UI font support

  FontInfo _fonts[MAX_FONTS];
  int _fontCount = 0;
  int _selectedIndex = -1;   // -1 = built-in font (reader)
  int _selectedUiIndex = -1; // -1 = fallback to reader font

  ExternalFont _activeFont;   // Reader font
  ExternalFont _activeUiFont; // UI font

  /**
   * Load selected reader font file
   */
  bool loadSelectedFont();

  /**
   * Load selected UI font file
   */
  bool loadSelectedUiFont();
};

// Convenience macro
#define FontMgr FontManager::getInstance()