//Lib
import { useForm } from 'react-hook-form';
import { signIn } from 'next-auth/react';
import { useState } from 'react';
import { SpinnerDotted } from 'spinners-react';
import { useRouter } from 'next/router';
import { authOptions } from './api/auth/[...nextauth]';
import { getServerSession } from 'next-auth/next';

//Components
import Error from '../Components/UI/Error/Error';

export default function Login() {
    //Var
    const {
        register,
        handleSubmit,
        formState: { errors },
        reset,
    } = useForm();
    const router = useRouter();

    //State
    const [isLoading, setIsLoading] = useState(false);
    const [error, setError] = useState();

    //Functions
    const formSubmitHandler = async (data) => {
        setIsLoading(true);
        setError(null);
        const resultat = await signIn('credentials', {
            username: data.username,
            password: data.password,
            redirect: false,
        });

        setIsLoading(false);

        if (resultat.error) {
            reset();
            setError(resultat.error);
            setTimeout(() => setError(), 4000);
        } else {
            router.replace('/');
        }
    };

    return (
        <div
            className='signInContainer'
            style={{
                display: 'flex',
                flexDirection: 'column',
                justifyContent: 'center',
                alignItems: 'center',
                height: '100vh',
            }}
        >
            <section style={{ display: 'flex', justifyContent: 'center' }}>
                <main
                    style={{
                        backgroundColor: '#212942',
                        padding: '30px',
                        borderRadius: '10px',
                        boxShadow:
                            '0 14px 28px rgba(0, 0, 0, .2), 0 10px 10px rgba(0, 0, 0, .2)',
                        height: '100%',
                        borderTop: '10px solid #704dff',
                        animation: 'ease-in 0.3s 1 normal none',
                        width: '310px',
                    }}
                >
                    <h1
                        style={{
                            fontSize: '1.8em',
                            fontWeight: 'bold',
                            color: '#6d4aff',
                            textShadow: '#6d4aff 0px 0px 18px',
                            textAlign: 'center',
                        }}
                    >
                        BorgWarehouse
                    </h1>
                    <h5
                        style={{
                            color: '#a1a4ad',
                            letterSpacing: '1.5px',
                            textAlign: 'center',
                            marginBottom: '3.5em',
                        }}
                    >
                        Sign in to your account.
                    </h5>
                    {error && <Error message={error} />}
                    <form onSubmit={handleSubmit(formSubmitHandler)}>
                        <p>
                            <input
                                type='text'
                                placeholder='Username'
                                className='signInInput'
                                {...register('username', {
                                    required: 'This field is required.',
                                    pattern: {
                                        value: /^[^\s]+$/g,
                                        message: 'No space allowed.',
                                    },
                                })}
                            />
                            {errors.username && (
                                <small
                                    style={{
                                        color: 'red',
                                        display: 'block',
                                        marginTop: '3px',
                                    }}
                                >
                                    {errors.username.message}
                                </small>
                            )}
                        </p>
                        <p>
                            <input
                                type='password'
                                placeholder='Password'
                                className='signInInput'
                                {...register('password', {
                                    required: 'This field is required.',
                                })}
                            />
                            {errors.password && (
                                <small
                                    style={{
                                        color: 'red',
                                        display: 'block',
                                        marginTop: '3px',
                                    }}
                                >
                                    {errors.password.message}
                                </small>
                            )}
                        </p>
                        <div
                            style={{
                                display: 'flex',
                                justifyContent: 'center',
                            }}
                        >
                            <button
                                className='signInButton'
                                disabled={isLoading}
                            >
                                {isLoading ? (
                                    <SpinnerDotted
                                        size={20}
                                        thickness={150}
                                        speed={100}
                                        color='#fff'
                                    />
                                ) : (
                                    'Sign in'
                                )}
                            </button>
                        </div>
                    </form>
                </main>
            </section>
        </div>
    );
}

export async function getServerSideProps(context) {
    //Var
    const session = await getServerSession(
        context.req,
        context.res,
        authOptions
    );

    //Here, if I am connected, I redirect to the home page.
    if (session) {
        return {
            redirect: {
                destination: '/',
                permanent: false,
            },
        };
    }

    return {
        props: { session },
    };
}