"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 { Card } from "@/components/ui/Card";
import Link from "next/link";
import { ROUTES } from "@/utils/constants";
import { useGoogleLogin } from "@react-oauth/google";
import { initFacebookSDK, loginWithFacebook } from "@/lib/facebook-sdk";
import toast from "react-hot-toast";

export default function LoginPage() {
  const { login, googleLogin, facebookLogin } = useAuth();
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [isGoogleLoading, setIsGoogleLoading] = useState(false);
  const [isFacebookLoading, setIsFacebookLoading] = useState(false);
  const [isFacebookSDKLoaded, setIsFacebookSDKLoaded] = useState(false);

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

  useEffect(() => {
    // Initialiser le SDK Facebook au chargement de la page
    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 googleLoginHandler = useGoogleLogin({
    onSuccess: async (tokenResponse) => {
      setIsGoogleLoading(true);
      console.log('🔑 Token Google reçu:', tokenResponse);
      try {
        await googleLogin(tokenResponse.access_token);
      } catch (error) {
        console.error("Google login error:", error);
      } finally {
        setIsGoogleLoading(false);
      }
    },
    onError: (error) => {
      console.error("Google login failed:", error);
      setIsGoogleLoading(false);
    },
    flow: 'implicit',
    scope: 'openid email profile',
  });

  const handleGoogleLogin = () => {
    if (!hasGoogleAuth) {
      toast.error("La connexion Google n'est pas configurée");
      return;
    }
    googleLoginHandler();
  };

  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') {
        toast.error("Erreur lors de la connexion avec Facebook");
      }
    } finally {
      setIsFacebookLoading(false);
    }
  };

  return (
    <div className="min-h-[calc(100vh-4rem)] flex items-center justify-center py-12 px-4">
      <Card className="w-full max-w-md p-8">
        <div className="text-center mb-8">
          <h1 className="text-3xl font-bold text-gray-900 mb-2">Connexion</h1>
          <p className="text-gray-600">
            Connectez-vous pour participer au jeu-concours
          </p>
        </div>

        <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
          <Input
            id="email"
            type="email"
            label="Email"
            placeholder="votre.email@example.com"
            error={errors.email?.message}
            {...register("email")}
            required
          />

          <Input
            id="password"
            type="password"
            label="Mot de passe"
            placeholder="••••••••"
            error={errors.password?.message}
            {...register("password")}
            required
          />

          <div className="flex items-center justify-between text-sm">
            <Link
              href="/forgot-password"
              className="text-blue-600 hover:text-blue-700 hover:underline"
            >
              Mot de passe oublié ?
            </Link>
          </div>

          <Button
            type="submit"
            isLoading={isSubmitting}
            disabled={isSubmitting}
            fullWidth
            size="lg"
          >
            Se connecter
          </Button>
        </form>

        {(hasGoogleAuth || hasFacebookAuth) && (
          <div className="mt-6">
            <div className="relative">
              <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-2 bg-white text-gray-500">
                  Ou continuer avec
                </span>
              </div>
            </div>

            <div className={`mt-6 grid ${hasGoogleAuth && hasFacebookAuth ? 'grid-cols-2' : 'grid-cols-1'} gap-3`}>
              {hasGoogleAuth && (
                <Button
                  type="button"
                  variant="outline"
                  onClick={() => handleGoogleLogin()}
                  disabled={isGoogleLoading}
                  isLoading={isGoogleLoading}
                  fullWidth
                >
                  <svg className="w-5 h-5 mr-2" viewBox="0 0 24 24">
                    <path
                      fill="#4285F4"
                      d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
                    />
                    <path
                      fill="#34A853"
                      d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
                    />
                    <path
                      fill="#FBBC05"
                      d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
                    />
                    <path
                      fill="#EA4335"
                      d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
                    />
                  </svg>
                  Google
                </Button>
              )}

              {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>
        )}

        <p className="mt-8 text-center text-sm text-gray-600">
          Vous n'avez pas de compte ?{" "}
          <Link
            href={ROUTES.REGISTER}
            className="font-medium text-blue-600 hover:text-blue-700 hover:underline"
          >
            Créer un compte
          </Link>
        </p>
      </Card>
    </div>
  );
}