'use client'

import { useState } from 'react'

export type AuthMode = 'login' | 'register' | 'forgot-password'

export interface AuthFormProps {
  mode: AuthMode
  onSubmit: (data: AuthFormData) => void | Promise<void>
  isLoading?: boolean
  error?: string
  onModeChange?: (mode: AuthMode) => void
}

export interface AuthFormData {
  email: string
  password?: string
  username?: string
  confirmPassword?: string
}

export function AuthForm({
  mode,
  onSubmit,
  isLoading = false,
  error,
  onModeChange
}: AuthFormProps) {
  const [formData, setFormData] = useState<AuthFormData>({
    email: '',
    password: '',
    username: '',
    confirmPassword: ''
  })

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault()
    onSubmit(formData)
  }

  const titles = {
    login: 'Welcome back',
    register: 'Create your account',
    'forgot-password': 'Reset your password'
  }

  const buttonTexts = {
    login: 'Sign in',
    register: 'Create account',
    'forgot-password': 'Send reset link'
  }

  return (
    <div className="w-full max-w-md mx-auto">
      <div className="bg-zinc-900 rounded-2xl p-8 shadow-2xl border border-zinc-800">
        {/* Logo/Title */}
        <div className="text-center mb-8">
          <div className="w-16 h-16 mx-auto mb-4 rounded-full bg-purple-500 flex items-center justify-center">
            <svg className="w-8 h-8 text-white" fill="currentColor" viewBox="0 0 20 20">
              <path d="M18 3a1 1 0 00-1.196-.98l-10 2A1 1 0 006 5v9.114A4.369 4.369 0 005 14c-1.657 0-3 .895-3 2s1.343 2 3 2 3-.895 3-2V7.82l8-1.6v5.894A4.37 4.37 0 0015 12c-1.657 0-3 .895-3 2s1.343 2 3 2 3-.895 3-2V3z" />
            </svg>
          </div>
          <h1 className="text-2xl font-bold text-white">{titles[mode]}</h1>
        </div>

        {/* Error Message */}
        {error && (
          <div className="mb-6 p-4 bg-red-500/10 border border-red-500/50 rounded-lg text-red-400 text-sm">
            {error}
          </div>
        )}

        {/* Form */}
        <form onSubmit={handleSubmit} className="space-y-4">
          {/* Username (Register only) */}
          {mode === 'register' && (
            <div>
              <label htmlFor="username" className="block text-sm font-medium text-zinc-300 mb-2">
                Username
              </label>
              <input
                type="text"
                id="username"
                value={formData.username}
                onChange={(e) => setFormData({ ...formData, username: e.target.value })}
                className="w-full px-4 py-3 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-purple-500"
                placeholder="Choose a username"
                required
              />
            </div>
          )}

          {/* Email */}
          <div>
            <label htmlFor="email" className="block text-sm font-medium text-zinc-300 mb-2">
              Email
            </label>
            <input
              type="email"
              id="email"
              value={formData.email}
              onChange={(e) => setFormData({ ...formData, email: e.target.value })}
              className="w-full px-4 py-3 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-purple-500"
              placeholder="your@email.com"
              required
            />
          </div>

          {/* Password (not in forgot-password) */}
          {mode !== 'forgot-password' && (
            <div>
              <label htmlFor="password" className="block text-sm font-medium text-zinc-300 mb-2">
                Password
              </label>
              <input
                type="password"
                id="password"
                value={formData.password}
                onChange={(e) => setFormData({ ...formData, password: e.target.value })}
                className="w-full px-4 py-3 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-purple-500"
                placeholder="••••••••"
                required
              />
            </div>
          )}

          {/* Confirm Password (Register only) */}
          {mode === 'register' && (
            <div>
              <label htmlFor="confirmPassword" className="block text-sm font-medium text-zinc-300 mb-2">
                Confirm Password
              </label>
              <input
                type="password"
                id="confirmPassword"
                value={formData.confirmPassword}
                onChange={(e) => setFormData({ ...formData, confirmPassword: e.target.value })}
                className="w-full px-4 py-3 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-purple-500"
                placeholder="••••••••"
                required
              />
            </div>
          )}

          {/* Forgot Password Link (Login only) */}
          {mode === 'login' && onModeChange && (
            <div className="text-right">
              <button
                type="button"
                onClick={() => onModeChange('forgot-password')}
                className="text-sm text-purple-400 hover:text-purple-300"
              >
                Forgot password?
              </button>
            </div>
          )}

          {/* Submit Button */}
          <button
            type="submit"
            disabled={isLoading}
            className="w-full py-3 bg-purple-500 hover:bg-purple-600 disabled:bg-zinc-700 disabled:text-zinc-500 text-white font-semibold rounded-lg transition"
          >
            {isLoading ? 'Loading...' : buttonTexts[mode]}
          </button>
        </form>

        {/* Mode Switch Links */}
        {onModeChange && (
          <div className="mt-6 text-center text-sm text-zinc-400">
            {mode === 'login' && (
              <p>
                Don't have an account?{' '}
                <button
                  onClick={() => onModeChange('register')}
                  className="text-purple-400 hover:text-purple-300 font-medium"
                >
                  Sign up
                </button>
              </p>
            )}
            {mode === 'register' && (
              <p>
                Already have an account?{' '}
                <button
                  onClick={() => onModeChange('login')}
                  className="text-purple-400 hover:text-purple-300 font-medium"
                >
                  Sign in
                </button>
              </p>
            )}
            {mode === 'forgot-password' && (
              <p>
                Remember your password?{' '}
                <button
                  onClick={() => onModeChange('login')}
                  className="text-purple-400 hover:text-purple-300 font-medium"
                >
                  Sign in
                </button>
              </p>
            )}
          </div>
        )}
      </div>
    </div>
  )
}