"use client";
import { useState, useEffect } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { useAuth } from "@/contexts/AuthContext";
import { loginSchema, LoginFormData } from "@/lib/validations";
import { Input } from "@/components/ui/Input";
import Button from "@/components/Button";
import Link from "next/link";
import TeaIconsBackground from "@/components/TeaIconsBackground";
import { ROUTES } from "@/utils/constants";
import { GoogleLoginButton } from "@/components/GoogleLoginButton";
import { initFacebookSDK, loginWithFacebook } from "@/lib/facebook-sdk";
import toast from "react-hot-toast";

export const dynamic = 'force-dynamic';

export default function LoginPage() {
  const { login, facebookLogin } = useAuth();
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [isFacebookLoading, setIsFacebookLoading] = useState(false);
  const [isFacebookSDKLoaded, setIsFacebookSDKLoaded] = useState(false);
  const [showPassword, setShowPassword] = useState(false);
  const [animationKey] = useState(Date.now());

  const hasGoogleAuth = !!process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID;
  const hasFacebookAuth = !!process.env.NEXT_PUBLIC_FACEBOOK_APP_ID;

  useEffect(() => {
    initFacebookSDK()
      .then(() => {
        setIsFacebookSDKLoaded(true);
        console.log('Facebook SDK loaded successfully');
      })
      .catch((error) => {
        console.error('Failed to load Facebook SDK:', error);
      });
  }, []);

  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<LoginFormData>({
    resolver: zodResolver(loginSchema),
  });

  const onSubmit = async (data: LoginFormData) => {
    setIsSubmitting(true);
    try {
      await login(data);
    } catch (error) {
      console.error("Login error:", error);
    } finally {
      setIsSubmitting(false);
    }
  };

  const handleFacebookLogin = async () => {
    if (!isFacebookSDKLoaded) {
      toast.error("Le SDK Facebook n'est pas encore chargé. Veuillez réessayer dans quelques secondes.");
      return;
    }

    setIsFacebookLoading(true);
    try {
      const accessToken = await loginWithFacebook();
      await facebookLogin(accessToken);
    } catch (error: any) {
      console.error("Facebook login error:", error);
      if (error.message !== 'Facebook login cancelled') {
        // Show the specific error message from Facebook SDK
        toast.error(error.message || "Erreur lors de la connexion avec Facebook");
      }
    } finally {
      setIsFacebookLoading(false);
    }
  };

  return (
    <div className="min-h-screen relative flex items-center justify-center py-12 px-4">
      <TeaIconsBackground animationKey={animationKey} />

      <div className="w-full max-w-md relative z-10">

        {/* Title */}
        <div className="text-center mb-8">
          <h1 className="text-4xl font-bold text-gray-900 mb-2">Connexion</h1>
          <p className="text-gray-600">
            Connectez-vous pour participer au jeu-concours
          </p>
        </div>

        {/* Main Card */}
        <div className="bg-white rounded-xl shadow-md overflow-hidden">

          {/* Tabs */}
          <div className="flex border-b border-gray-200">
            <button className="flex-1 py-4 px-6 text-center font-bold text-gray-900 bg-white border-b-3 border-primary-500 shadow-[0_3px_8px_rgba(11,96,41,0.2)] relative">
              <span className="relative z-10">Connexion</span>
              <div className="absolute bottom-0 left-0 right-0 h-0.5 bg-gradient-to-r from-transparent via-primary-500 to-transparent"></div>
            </button>
            <Link
              href={ROUTES.REGISTER}
              className="flex-1 py-4 px-6 text-center font-semibold text-gray-500 bg-gray-50 hover:bg-gradient-to-r hover:from-primary-50 hover:to-primary-100 hover:text-primary-600 transition-all duration-300 hover:shadow-inner"
            >
              Inscription
            </Link>
          </div>

          {/* Form Container */}
          <div className="p-8">
            {/* Hidden h2 for accessibility - maintains heading hierarchy */}
            <h2 className="sr-only">Formulaire de connexion</h2>

            {/* Login Form */}
            <form onSubmit={handleSubmit(onSubmit)} className="space-y-5">

              {/* Email */}
              <div>
                <label htmlFor="email" className="block text-sm font-semibold text-gray-900 mb-2">
                  Email <span className="text-red-700 font-bold" aria-hidden="true">*</span>
                  <span className="sr-only">(obligatoire)</span>
                </label>
                <input
                  id="email"
                  type="email"
                  placeholder="email"
                  {...register("email")}
                  className={`w-full px-4 py-3 border ${errors.email ? 'border-red-500' : 'border-gray-300'} rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent`}
                />
                {errors.email && (
                  <p className="mt-1 text-sm text-red-500">{errors.email.message}</p>
                )}
              </div>

              {/* Password */}
              <div>
                <label htmlFor="password" className="block text-sm font-semibold text-gray-900 mb-2">
                  Mot de passe <span className="text-red-700 font-bold" aria-hidden="true">*</span>
                  <span className="sr-only">(obligatoire)</span>
                </label>
                <div className="relative">
                  <input
                    id="password"
                    type={showPassword ? "text" : "password"}
                    placeholder="mot de passe"
                    {...register("password")}
                    className={`w-full px-4 py-3 border ${errors.password ? 'border-red-500' : 'border-gray-300'} rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent pr-12`}
                  />
                  <button
                    type="button"
                    onClick={() => setShowPassword(!showPassword)}
                    className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-500 hover:text-gray-700"
                    aria-label={showPassword ? "Masquer le mot de passe" : "Afficher le mot de passe"}
                  >
                    {showPassword ? (
                      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden="true">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
                      </svg>
                    ) : (
                      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden="true">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
                      </svg>
                    )}
                  </button>
                </div>
                {errors.password && (
                  <p className="mt-1 text-sm text-red-500">{errors.password.message}</p>
                )}
              </div>

              {/* Submit Button */}
              <button
                type="submit"
                disabled={isSubmitting}
                className="w-full bg-gradient-to-r from-primary-500 to-primary-600 hover:from-primary-400 hover:to-primary-500 disabled:bg-gray-400 disabled:from-gray-400 disabled:to-gray-400 text-white font-bold px-8 py-4 rounded-lg transition-all duration-300 hover:shadow-[0_0_25px_rgba(11,96,41,0.5)] hover:scale-[1.02] shadow-lg transform"
              >
                {isSubmitting ? "Connexion..." : "Se connecter"}
              </button>

              {/* Forgot Password */}
              <div className="text-center">
                <Link
                  href="/forgot-password"
                  className="text-sm text-beige-800 hover:text-primary-500 hover:underline transition-colors"
                >
                  Mot de passe oublié ?
                </Link>
              </div>
            </form>

            {/* Divider */}
            {(hasGoogleAuth || hasFacebookAuth) && (
              <div className="relative my-6">
                <div className="absolute inset-0 flex items-center">
                  <div className="w-full border-t border-gray-300" />
                </div>
                <div className="relative flex justify-center text-sm">
                  <span className="px-4 bg-white text-gray-500">
                    Ou continuer avec
                  </span>
                </div>
              </div>
            )}

            {/* Social Login Buttons */}
            {(hasGoogleAuth || hasFacebookAuth) && (
              <div className="space-y-3">
                {hasGoogleAuth && (
                  <GoogleLoginButton fullWidth />
                )}

                {hasFacebookAuth && (
                  <Button
                    type="button"
                    variant="outline"
                    onClick={handleFacebookLogin}
                    disabled={isFacebookLoading || !isFacebookSDKLoaded}
                    isLoading={isFacebookLoading}
                    fullWidth
                  >
                    <svg className="w-5 h-5 mr-2" fill="#1877F2" viewBox="0 0 24 24">
                      <path d="M24 12.073c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.99 4.388 10.954 10.125 11.854v-8.385H7.078v-3.47h3.047V9.43c0-3.007 1.792-4.669 4.533-4.669 1.312 0 2.686.235 2.686.235v2.953H15.83c-1.491 0-1.956.925-1.956 1.874v2.25h3.328l-.532 3.47h-2.796v8.385C19.612 23.027 24 18.062 24 12.073z" />
                    </svg>
                    Facebook
                  </Button>
                )}
              </div>
            )}

          </div>
        </div>
      </div>
    </div>
  );
}
