/**
 * Emoji alphabet for visual verification of shared secrets.
 *
 * This alphabet contains 256 distinct, easily recognizable emojis for
 * anti-spoofing verification. With 256 emojis, each emoji represents
 * exactly 8 bits of entropy (log2(256) = 8).
 *
 * A 3x3 grid of 9 emojis provides 72 bits of security (9 × 8 = 72 bits),
 * making brute-force attacks computationally infeasible for real-time
 * MITM verification scenarios.
 *
 * Selection criteria:
 * - Visually distinct from each other
 * - Commonly supported across platforms (Unicode 12+)
 * - Easy to recognize and compare at a glance
 * - No text-based or flag emojis (platform-dependent rendering)
 * - No variation selectors (base emojis only)
 *
 * @packageDocumentation
 */

/**
 * 256 distinct emojis for visual verification.
 * Index directly maps to byte value (0-255) for simple lookup.
 */
export const EMOJI_ALPHABET: readonly string[] = [
  // 0-15: Faces & figures (16)
  '😀',
  '😎',
  '🤖',
  '👻',
  '💀',
  '👽',
  '🤡',
  '🎃',
  '😺',
  '😈',
  '👾',
  '🗿',
  '🤠',
  '🥸',
  '🧐',
  '😵',

  // 16-47: Animals (32)
  '🐶',
  '🐱',
  '🐸',
  '🐵',
  '🦊',
  '🐻',
  '🦁',
  '🐯',
  '🐮',
  '🐷',
  '🐔',
  '🐧',
  '🦉',
  '🦇',
  '🐺',
  '🦄',
  '🐘',
  '🦒',
  '🐊',
  '🦈',
  '🐙',
  '🦋',
  '🐢',
  '🦀',
  '🐍',
  '🦅',
  '🦆',
  '🐳',
  '🦭',
  '🦩',
  '🦚',
  '🐉',

  // 48-63: Nature & weather (16)
  '🌵',
  '🌴',
  '🌲',
  '🌳',
  '🍄',
  '🌍',
  '🌕',
  '🌙',
  '🌟',
  '🌈',
  '🔥',
  '💧',
  '🌨',
  '💢',
  '🌞',
  '🌤',

  // 64-95: Food & drinks (32)
  '🍎',
  '🍌',
  '🍇',
  '🍉',
  '🍓',
  '🍍',
  '🥑',
  '🌽',
  '🥕',
  '🍔',
  '🍕',
  '🌮',
  '🍣',
  '🍪',
  '🎂',
  '🍩',
  '🍺',
  '🍷',
  '🍸',
  '🫗',
  '🧃',
  '🥛',
  '🍵',
  '🧁',
  '🍫',
  '🍬',
  '🍭',
  '🥨',
  '🥯',
  '🥞',
  '🧇',
  '🍿',

  // 96-127: Symbols & colors (32)
  '💯',
  '💔',
  '💥',
  '💫',
  '🌀',
  '🫨',
  '🚧',
  '🛑',
  '🔴',
  '🔵',
  '🟢',
  '🟡',
  '🟣',
  '⬛',
  '⬜',
  '🟤',
  '💜',
  '💙',
  '💚',
  '🧡',
  '🖤',
  '🤍',
  '💘',
  '💍',
  '💎',
  '👑',
  '🎩',
  '🧢',
  '🪭',
  '🎗',
  '🎟',
  '🏷',

  // 128-159: Electronics & tools (32)
  '🕐',
  '📱',
  '💻',
  '🖥',
  '📷',
  '🎥',
  '📺',
  '📻',
  '🔋',
  '💡',
  '🔑',
  '🔨',
  '🛠',
  '🧲',
  '🧪',
  '🔬',
  '🔧',
  '🪛',
  '🔩',
  '🪚',
  '🪓',
  '🧹',
  '🪣',
  '🧴',
  '🛁',
  '🚽',
  '🪜',
  '🔔',
  '🕯',
  '🪤',
  '🧯',
  '🪝',

  // 160-175: Transport (16)
  '🚗',
  '🚌',
  '🚓',
  '🚑',
  '🚒',
  '🚜',
  '🚲',
  '🏍',
  '🛩',
  '🚀',
  '🛸',
  '🚁',
  '🚢',
  '🚤',
  '🚂',
  '🚠',

  // 176-191: Sports & games (16)
  '🥅',
  '🏀',
  '🏈',
  '🏐',
  '🏓',
  '🎱',
  '🎯',
  '🎳',
  '🎲',
  '🎮',
  '🕹',
  '🧩',
  '🎴',
  '🎰',
  '🃏',
  '🀄',

  // 192-207: Music & arts (16)
  '🎸',
  '🎹',
  '🎺',
  '🎻',
  '🥁',
  '🎷',
  '🎤',
  '🎧',
  '🎨',
  '🖌',
  '🎭',
  '🎪',
  '🎬',
  '🎼',
  '🪕',
  '🪗',

  // 208-223: Buildings & places (16)
  '🏠',
  '🏰',
  '🗼',
  '🗽',
  '🏛',
  '🕌',
  '🛕',
  '🏯',
  '🎢',
  '🎡',
  '🛖',
  '🏕',
  '🗻',
  '🏝',
  '🌋',
  '🏜',

  // 224-239: Science & medical (16)
  '📦',
  '🧳',
  '🕰',
  '🔦',
  '🪫',
  '📡',
  '🔭',
  '🔮',
  '🧿',
  '📿',
  '🫙',
  '💉',
  '🩺',
  '🩹',
  '🧬',
  '🦠',

  // 240-255: Miscellaneous (16)
  '🏆',
  '🎁',
  '🎈',
  '🎀',
  '🪅',
  '🧧',
  '📨',
  '📜',
  '🗃',
  '📎',
  '🪡',
  '🖋',
  '📌',
  '🔐',
  '🧸',
  '🪆',
] as const;

/**
 * Number of emojis in the alphabet.
 * Must be a power of 2 for clean bit mapping (256 = 2^8).
 */
export const EMOJI_ALPHABET_SIZE = 256;

/**
 * Bits of entropy per emoji (log2 of alphabet size).
 */
export const BITS_PER_EMOJI = 8;