import React, { useState } from 'react';
import { X, User, Lock, Phone, CheckCircle, ArrowRight, AlertCircle, RefreshCw, MessageSquare, Eye, EyeOff } from 'lucide-react';
import { Language } from '../types';
import { TRANSLATIONS } from '../constants/translations';

interface AuthModalProps {
  isVisible: boolean;
  onClose: () => void;
  language: Language;
  onLogin: (phone: string, password?: string) => void;
  onRegister: (phone: string, name: string, pass: string) => void;
  onResetPassword?: (phone: string, newPass: string) => Promise<boolean>;
}

export const AuthModal: React.FC<AuthModalProps> = ({ isVisible, onClose, language, onLogin, onRegister, onResetPassword }) => {
  const [mode, setMode] = useState<'login' | 'register' | 'reset'>('login');
  const [formData, setFormData] = useState({ phone: '', name: '', password: '', confirmPassword: '', code: '' });
  const [error, setError] = useState<string | null>(null);
  const [successMsg, setSuccessMsg] = useState<string | null>(null);
  const [isCodeSent, setIsCodeSent] = useState(false);
  const [showPassword, setShowPassword] = useState(false);
  const t = TRANSLATIONS[language];

  if (!isVisible) return null;

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    setSuccessMsg(null);

    if (mode === 'login') {
      onLogin(formData.phone, formData.password);
    } else if (mode === 'register') {
      // Registration Validation
      if (!formData.name.trim()) {
        setError("Name is required");
        return;
      }
      if (formData.password.length < 6) {
        setError("Password must be at least 6 characters");
        return;
      }
      if (formData.password !== formData.confirmPassword) {
        setError(t.authPassMismatch);
        return;
      }
      onRegister(formData.phone, formData.name, formData.password);
      setFormData({ phone: '', name: '', password: '', confirmPassword: '', code: '' });
      onClose();
    } else if (mode === 'reset') {
        // Reset Password Flow
        if (!isCodeSent) {
             // Simulate Sending Code
             if (formData.phone.length < 5) {
                 setError("Please enter a valid phone number");
                 return;
             }
             setIsCodeSent(true);
             setSuccessMsg(`${t.authCodeSent} 8888`); // Simulation
             return;
        }

        // Verify Step
        if (formData.code !== '8888') {
             setError("Invalid verification code (Demo: 8888)");
             return;
        }
        if (formData.password.length < 6) {
             setError("New password must be at least 6 characters");
             return;
        }
        if (formData.password !== formData.confirmPassword) {
             setError(t.authPassMismatch);
             return;
        }
        
        if (onResetPassword) {
            const success = await onResetPassword(formData.phone, formData.password);
            if (success) {
                setSuccessMsg(t.authResetSuccess);
                setTimeout(() => {
                    setMode('login');
                    setIsCodeSent(false);
                    setSuccessMsg(null);
                    setFormData({ ...formData, password: '', confirmPassword: '', code: '' });
                }, 2000);
            } else {
                setError(t.authPhoneNotFound);
            }
        }
    }
  };

  const toggleMode = (newMode: 'login' | 'register' | 'reset') => {
      setMode(newMode);
      setFormData({ phone: '', name: '', password: '', confirmPassword: '', code: '' }); // Clear form
      setError(null);
      setSuccessMsg(null);
      setIsCodeSent(false);
      setShowPassword(false);
  };

  return (
    <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-black/70 backdrop-blur-sm animate-fade-in">
       <div className="bg-white rounded-2xl shadow-2xl w-full max-w-sm overflow-hidden relative">
          <button onClick={onClose} className="absolute top-4 right-4 p-1 rounded-full hover:bg-gray-100 transition-colors z-10">
             <X className="w-5 h-5 text-gray-500" />
          </button>
          
          <div className="p-8">
             <div className="text-center mb-6">
                <div className={`w-12 h-12 rounded-full flex items-center justify-center mx-auto mb-3 transition-colors ${mode === 'login' ? 'bg-rose-100 text-rose-500' : mode === 'register' ? 'bg-green-100 text-green-500' : 'bg-blue-100 text-blue-500'}`}>
                    {mode === 'login' ? <User className="w-6 h-6" /> : mode === 'register' ? <CheckCircle className="w-6 h-6" /> : <RefreshCw className="w-6 h-6" />}
                </div>
                <h2 className="text-2xl font-serif font-bold text-gray-900">
                  {mode === 'login' ? t.authLogin : mode === 'register' ? t.authRegister : t.authReset}
                </h2>
                <p className="text-sm text-gray-500 mt-1">Romantic Life Studio</p>
             </div>

             {error && (
                <div className="mb-4 p-3 bg-red-50 border border-red-100 rounded-lg flex items-center gap-2 text-xs text-red-600 font-medium animate-pulse">
                   <AlertCircle className="w-4 h-4 shrink-0" />
                   {error}
                </div>
             )}
             
             {successMsg && (
                <div className="mb-4 p-3 bg-green-50 border border-green-100 rounded-lg flex items-center gap-2 text-xs text-green-600 font-medium animate-fade-in">
                   <CheckCircle className="w-4 h-4 shrink-0" />
                   {successMsg}
                </div>
             )}

             <form onSubmit={handleSubmit} className="space-y-4">
                {mode === 'register' && (
                  <div className="relative group animate-fade-in-down">
                     <User className="absolute top-3 left-3 w-5 h-5 text-gray-400 group-focus-within:text-rose-500 transition-colors" />
                     <input 
                       type="text" 
                       placeholder={t.authNamePlace}
                       required
                       value={formData.name}
                       onChange={e => setFormData({...formData, name: e.target.value})}
                       className="w-full pl-10 pr-4 py-2.5 rounded-lg border border-gray-200 focus:border-rose-500 outline-none bg-gray-50 focus:bg-white transition-all"
                     />
                  </div>
                )}
                
                <div className="relative group">
                   <Phone className="absolute top-3 left-3 w-5 h-5 text-gray-400 group-focus-within:text-rose-500 transition-colors" />
                   <input 
                     type="tel" 
                     placeholder={t.authPhonePlace}
                     required
                     disabled={mode === 'reset' && isCodeSent}
                     value={formData.phone}
                     onChange={e => setFormData({...formData, phone: e.target.value})}
                     className="w-full pl-10 pr-4 py-2.5 rounded-lg border border-gray-200 focus:border-rose-500 outline-none bg-gray-50 focus:bg-white transition-all disabled:bg-gray-100 disabled:text-gray-500"
                   />
                </div>

                {mode === 'reset' && isCodeSent && (
                    <div className="relative group animate-fade-in-down">
                        <MessageSquare className="absolute top-3 left-3 w-5 h-5 text-gray-400 group-focus-within:text-rose-500 transition-colors" />
                        <input 
                          type="text" 
                          placeholder={t.authCodePlace}
                          required
                          value={formData.code}
                          onChange={e => setFormData({...formData, code: e.target.value})}
                          className="w-full pl-10 pr-4 py-2.5 rounded-lg border border-gray-200 focus:border-rose-500 outline-none bg-gray-50 focus:bg-white transition-all"
                        />
                    </div>
                )}

                {/* Password Fields - Hidden for Reset step 1 */}
                {!(mode === 'reset' && !isCodeSent) && (
                    <div className="relative group">
                       <Lock className="absolute top-3 left-3 w-5 h-5 text-gray-400 group-focus-within:text-rose-500 transition-colors" />
                       <input 
                         type={showPassword ? "text" : "password"}
                         placeholder={mode === 'reset' ? t.authNewPassPlace : t.authPassPlace}
                         required
                         value={formData.password}
                         onChange={e => setFormData({...formData, password: e.target.value})}
                         className="w-full pl-10 pr-10 py-2.5 rounded-lg border border-gray-200 focus:border-rose-500 outline-none bg-gray-50 focus:bg-white transition-all"
                       />
                       <button 
                         type="button" 
                         onClick={() => setShowPassword(!showPassword)}
                         className="absolute top-3 right-3 text-gray-400 hover:text-gray-600 focus:outline-none"
                         tabIndex={-1}
                       >
                         {showPassword ? <EyeOff className="w-5 h-5" /> : <Eye className="w-5 h-5" />}
                       </button>
                    </div>
                )}

                {(mode === 'register' || (mode === 'reset' && isCodeSent)) && (
                   <div className="relative group animate-fade-in-down">
                      <CheckCircle className="absolute top-3 left-3 w-5 h-5 text-gray-400 group-focus-within:text-rose-500 transition-colors" />
                      <input 
                        type="password" 
                        placeholder={t.authConfirmPassPlace}
                        required
                        value={formData.confirmPassword}
                        onChange={e => setFormData({...formData, confirmPassword: e.target.value})}
                        className="w-full pl-10 pr-4 py-2.5 rounded-lg border border-gray-200 focus:border-rose-500 outline-none bg-gray-50 focus:bg-white transition-all"
                      />
                   </div>
                )}

                <button type="submit" className={`w-full py-3 text-white rounded-xl font-bold shadow-lg transition-all flex items-center justify-center gap-2 mt-2 ${mode === 'login' ? 'bg-rose-600 hover:bg-rose-700 shadow-rose-200' : mode === 'reset' ? 'bg-blue-600 hover:bg-blue-700 shadow-blue-200' : 'bg-green-600 hover:bg-green-700 shadow-green-200'}`}>
                   {mode === 'login' ? t.authLogin : mode === 'register' ? t.authRegister : isCodeSent ? t.authSubmit : t.authSendCode}
                   {!(mode === 'reset' && !isCodeSent) && <ArrowRight className="w-4 h-4" />}
                </button>
             </form>
             
             {mode === 'login' && (
                 <div className="mt-3 text-right">
                    <button onClick={() => toggleMode('reset')} className="text-xs text-gray-500 hover:text-rose-500 transition-colors">
                        {t.authForgotPass}
                    </button>
                 </div>
             )}

             <div className="mt-6 text-center border-t border-gray-100 pt-4">
                <button 
                  onClick={() => toggleMode(mode === 'login' ? 'register' : 'login')}
                  className="text-sm text-rose-500 font-bold hover:text-rose-600 transition-colors hover:underline"
                >
                   {mode === 'login' ? t.authNoAccount : t.authHasAccount}
                </button>
             </div>
          </div>
       </div>
    </div>
  );
};