import React, { useState } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import { Hexagon, Lock, Mail, ArrowRight, Loader2, Eye, EyeOff, AlertCircle } from 'lucide-react';
import { login } from '../services/dataService';

export const Login: React.FC = () => {
  const navigate = useNavigate();
  const [isLoading, setIsLoading] = useState(false);
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [showPassword, setShowPassword] = useState(false);
  const [error, setError] = useState('');
  const [emailError, setEmailError] = useState('');

  const validateEmail = (value: string) => {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!value) {
      setEmailError('');
    } else if (!emailRegex.test(value)) {
      setEmailError('Por favor, insira um e-mail válido.');
    } else {
      setEmailError('');
    }
  };

  const handleEmailChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const value = e.target.value;
    setEmail(value);
    validateEmail(value);
  };

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    if (emailError) return;

    setIsLoading(true);
    setError('');
    
    try {
      const data = await login({ email, password });
      
      localStorage.setItem('ctms_token', data.token);
      localStorage.setItem('ctms_user_id', data.user.id);
      localStorage.setItem('ctms_tenant_id', data.user.tenant_id || '');
      
      setIsLoading(false);
      
      if (data.user.role === 'super_admin') {
        navigate('/super-admin');
      } else {
        navigate('/');
      }
    } catch (err: any) {
      console.error("Login error:", err);
      setIsLoading(false);
      setError(err.message || 'E-mail ou senha incorretos.');
    }
  };

  return (
    <div className="min-h-screen bg-slate-50 flex flex-col justify-center py-12 sm:px-6 lg:px-8">
      <div className="sm:mx-auto sm:w-full sm:max-w-md">
        <div className="flex justify-center items-center gap-2 text-slate-900">
          <div className="bg-slate-900 text-white p-2 rounded-lg">
             <Hexagon size={28} fill="currentColor" />
          </div>
          <span className="text-3xl font-bold tracking-tight">Fasto<span className="text-yellow-500">.</span></span>
        </div>
        <h2 className="mt-6 text-center text-3xl font-bold tracking-tight text-slate-900">
          Acesse sua conta
        </h2>
      </div>

      <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
        <div className="bg-white py-8 px-4 shadow-xl shadow-slate-200/50 rounded-2xl sm:px-10 border border-slate-100">
          
          <form className="space-y-6" onSubmit={handleLogin}>
            <div>
              <label htmlFor="email" className="block text-sm font-medium text-slate-700">
                Endereço de e-mail
              </label>
              <div className="mt-1 relative rounded-md shadow-sm">
                <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                  <Mail className={`h-5 w-5 ${emailError ? 'text-red-400' : 'text-slate-400'}`} />
                </div>
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  value={email}
                  onChange={handleEmailChange}
                  className={`block w-full pl-10 pr-3 py-2 border rounded-lg leading-5 bg-white placeholder-slate-400 focus:outline-none focus:ring-2 transition-all sm:text-sm ${
                    emailError 
                      ? 'border-red-300 focus:ring-red-100 focus:border-red-500' 
                      : 'border-slate-300 focus:ring-blue-100 focus:border-blue-500'
                  }`}
                  placeholder="voce@empresa.com"
                />
              </div>
              {emailError && (
                <p className="mt-1.5 text-xs text-red-500 font-medium flex items-center gap-1">
                  <AlertCircle size={12} /> {emailError}
                </p>
              )}
            </div>

            <div>
              <label htmlFor="password" senior-admin-password className="block text-sm font-medium text-slate-700">
                Senha
              </label>
              <div className="mt-1 relative rounded-md shadow-sm">
                <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                  <Lock className="h-5 w-5 text-slate-400" />
                </div>
                <input
                  id="password"
                  name="password"
                  type={showPassword ? 'text' : 'password'}
                  autoComplete="current-password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="block w-full pl-10 pr-10 py-2 border border-slate-300 rounded-lg leading-5 bg-white placeholder-slate-400 focus:outline-none focus:ring-2 focus:ring-blue-100 focus:border-blue-500 sm:text-sm transition-all"
                  placeholder="••••••••"
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="absolute inset-y-0 right-0 pr-3 flex items-center text-slate-400 hover:text-slate-600 transition-colors"
                >
                  {showPassword ? <EyeOff size={18} /> : <Eye size={18} />}
                </button>
              </div>
            </div>

            {error && (
              <div className="bg-red-50 border border-red-100 text-red-600 px-4 py-3 rounded-xl text-sm font-medium flex items-center gap-2 animate-in fade-in slide-in-from-top-2 duration-200">
                <AlertCircle size={18} className="shrink-0" />
                {error}
              </div>
            )}

            <div className="flex items-center justify-between">
              <div className="flex items-center">
                <input
                  id="remember-me"
                  name="remember-me"
                  type="checkbox"
                  className="h-4 w-4 text-blue-600 focus:ring-blue-500 border-slate-300 rounded"
                />
                <label htmlFor="remember-me" className="ml-2 block text-sm text-slate-900">
                  Lembrar de mim
                </label>
              </div>

              <div className="text-sm">
                <Link to="/forgot-password" title="Recuperar Senha" className="font-medium text-blue-600 hover:text-blue-500">
                  Esqueceu sua senha?
                </Link>
              </div>
            </div>

            <div>
              <button
                type="submit"
                disabled={isLoading || !!emailError || !email}
                className="w-full flex justify-center items-center gap-2 py-2.5 px-4 border border-transparent rounded-lg shadow-sm text-sm font-semibold text-white bg-slate-900 hover:bg-slate-800 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-slate-900 disabled:opacity-70 disabled:cursor-not-allowed transition-all"
              >
                {isLoading ? (
                  <>
                    <Loader2 className="animate-spin h-4 w-4" />
                    Entrando...
                  </>
                ) : (
                  <>
                    Entrar <ArrowRight className="h-4 w-4" />
                  </>
                )}
              </button>
            </div>
          </form>

          <div className="mt-6">
            <div className="relative">
              <div className="absolute inset-0 flex items-center">
                <div className="w-full border-t border-slate-200" />
              </div>
              <div className="relative flex justify-center text-sm">
                <span className="px-2 bg-white text-slate-500 text-xs">
                  Desenvolvido por <a href="https://blyzer.com.br" target="_blank" rel="noopener noreferrer" className="text-blue-600 hover:underline">Blyzer</a>
                </span>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};
