Pass Strength Dotted Indicator

'use client';
import { Check, CheckCheck, Eye, EyeOff, X } from 'lucide-react';
import React, { useMemo, useState } from 'react';

// Constants
const PASSWORD_REQUIREMENTS = [
  { regex: /.{8,}/, text: 'At least 8 characters' },
  { regex: /[0-9]/, text: 'At least 1 number' },
  { regex: /[a-z]/, text: 'At least 1 lowercase letter' },
  { regex: /[A-Z]/, text: 'At least 1 uppercase letter' },
  { regex: /[!-/:-@[-`{-~]/, text: 'At least 1 special characters' },
] as const;

type StrengthScore = 0 | 1 | 2 | 3 | 4 | 5;

const STRENGTH_CONFIG = {
  colors: {
    0: 'bg-border',
    1: 'bg-red-500',
    2: 'bg-orange-500',
    3: 'bg-amber-500',
    4: 'bg-amber-700',
    5: 'bg-emerald-500',
  } satisfies Record<StrengthScore, string>,
  texts: {
    0: 'Enter a password',
    1: 'Weak password',
    2: 'Medium password!',
    3: 'Strong password!!',
    4: 'Very Strong password!!!',
  } satisfies Record<Exclude<StrengthScore, 5>, string>,
} as const;

// Types
type Requirement = {
  met: boolean;
  text: string;
};

type PasswordStrength = {
  score: StrengthScore;
  requirements: Requirement[];
};

const PasswordInput = () => {
  const [password, setPassword] = useState('');
  const [isVisible, setIsVisible] = useState(false);

  const calculateStrength = useMemo((): PasswordStrength => {
    const requirements = PASSWORD_REQUIREMENTS.map((req) => ({
      met: req.regex.test(password),
      text: req.text,
    }));

    return {
      score: requirements.filter((req) => req.met).length as StrengthScore,
      requirements,
    };
  }, [password]);

  // console.log(calculateStrength);

  return (
    <div className='w-96 mx-auto py-14 '>
      <form className='space-y-2'>
        <label htmlFor='password' className='block text-sm font-medium'>
          Password
        </label>
        <div className='relative'>
          <input
            id='password'
            type={isVisible ? 'text' : 'password'}
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            placeholder='Password'
            aria-invalid={calculateStrength.score < 4}
            aria-describedby='password-strength'
            className='w-full p-2 border-2 rounded-md dark:bg-neutral-950 bg-neutral-50 outline-hidden focus-within:border-blue-700 transition'
          />
          <button
            type='button'
            onClick={() => setIsVisible((prev) => !prev)}
            aria-label={isVisible ? 'Hide password' : 'Show password'}
            className='absolute inset-y-0 right-0 outline-hidden flex items-center justify-center w-9 text-muted-foreground/80 hover:text-foreground  '
          >
            {isVisible ? <EyeOff size={16} /> : <Eye size={16} />}
          </button>
        </div>
      </form>
      <div className='flex gap-2 w-full justify-between mt-2'>
        <span
          className={`${
            calculateStrength.score >= 1 ? 'bg-green-200' : 'dark:bg-neutral-950 bg-neutral-50'
          }  p-1 rounded-full w-full`}
        ></span>
        <span
          className={`${
            calculateStrength.score >= 2 ? 'bg-green-300' : 'dark:bg-neutral-950 bg-neutral-50'
          }  p-1 rounded-full w-full`}
        ></span>
        <span
          className={`${
            calculateStrength.score >= 3 ? 'bg-green-400' : 'dark:bg-neutral-950 bg-neutral-50'
          }  p-1 rounded-full w-full`}
        ></span>
        <span
          className={`${
            calculateStrength.score >= 4 ? 'bg-green-500' : 'dark:bg-neutral-950 bg-neutral-50'
          }  p-1 rounded-full w-full`}
        ></span>
        <span
          className={`${
            calculateStrength.score >= 5 ? 'bg-green-600' : 'dark:bg-neutral-950 bg-neutral-50'
          }  p-1 rounded-full w-full`}
        ></span>
      </div>

      <p id='password-strength' className='my-2 text-sm font-medium flex justify-between'>
        <span>Must contain:</span>
        <span>
          {
            STRENGTH_CONFIG.texts[
              Math.min(calculateStrength.score, 4) as keyof typeof STRENGTH_CONFIG.texts
            ]
          }
        </span>
      </p>

      <ul className='space-y-1.5' aria-label='Password requirements'>
        {calculateStrength.requirements.map((req, index) => (
          <li key={req.text} className='flex items-center space-x-2'>
            {req.met ? (
              <CheckCheck size={16} className='text-emerald-500' />
            ) : (
              <X size={16} className='text-muted-foreground/80' />
            )}
            <span className={`text-xs ${req.met ? 'text-emerald-600' : 'text-muted-foreground'}`}>
              {req.text}
              <span className='sr-only'>
                {req.met ? ' - Requirement met' : ' - Requirement not met'}
              </span>
            </span>
          </li>
        ))}
      </ul>
    </div>
  );
};

export default PasswordInput;