import { customAlphabet } from 'nanoid';

// Word lists for generating memorable tokens
const adjectives = [
  'quick',
  'lazy',
  'happy',
  'brave',
  'bright',
  'calm',
  'clever',
  'eager',
  'gentle',
  'kind',
  'lively',
  'proud',
  'silly',
  'witty',
  'bold',
  'cool',
  'fair',
  'fine',
  'glad',
  'good',
  'neat',
  'nice',
  'rare',
  'safe',
  'warm',
  'wise',
  'fresh',
  'clean',
  'clear',
  'crisp',
  'sweet',
  'smooth',
];

const colors = [
  'red',
  'blue',
  'green',
  'yellow',
  'purple',
  'orange',
  'pink',
  'black',
  'white',
  'gray',
  'brown',
  'cyan',
  'lime',
  'navy',
  'teal',
  'gold',
  'silver',
  'coral',
  'salmon',
  'indigo',
  'violet',
  'crimson',
  'azure',
  'jade',
];

const animals = [
  'cat',
  'dog',
  'bird',
  'fish',
  'bear',
  'lion',
  'wolf',
  'fox',
  'deer',
  'owl',
  'hawk',
  'duck',
  'goat',
  'seal',
  'crab',
  'moth',
  'bee',
  'ant',
  'bat',
  'cow',
  'pig',
  'hen',
  'ram',
  'rat',
  'eel',
  'cod',
  'jay',
  'yak',
  'ox',
  'pug',
  'doe',
  'hog',
];

const nouns = [
  'moon',
  'star',
  'cloud',
  'river',
  'mountain',
  'ocean',
  'forest',
  'desert',
  'island',
  'valley',
  'meadow',
  'garden',
  'bridge',
  'castle',
  'tower',
  'light',
  'shadow',
  'dream',
  'hope',
  'wish',
  'song',
  'dance',
  'smile',
  'laugh',
  'gift',
  'pearl',
  'jewel',
  'crown',
  'shield',
  'sword',
  'arrow',
  'bow',
];

// Generate a 4-digit number suffix for uniqueness
const generateNumber = customAlphabet('0123456789', 4);

function getRandomElement<T>(array: T[]): T {
  return array[Math.floor(Math.random() * array.length)];
}

export function generateMemorableToken(): string {
  const parts = [
    getRandomElement(adjectives),
    getRandomElement(colors),
    getRandomElement(animals),
    generateNumber(),
  ];

  return parts.join('-');
}

export function generateShortToken(): string {
  const parts = [getRandomElement(colors), getRandomElement(nouns), generateNumber()];

  return parts.join('-');
}

// Validate token format
export function isValidToken(token: string): boolean {
  // Check if token matches our format (word-word-word-4digits or word-word-4digits)
  const longFormat = /^[a-z]+-[a-z]+-[a-z]+-\d{4}$/;
  const shortFormat = /^[a-z]+-[a-z]+-\d{4}$/;

  return longFormat.test(token) || shortFormat.test(token);
}