import React, { useCallback, useEffect, useRef, useState } from "react";
import {Button, Card, Checkbox, Col, Form, Input, Modal, notification, Row, Space} from "antd";
import Markdown from "react-markdown";
import { createStructuredSelector } from "reselect";
import { selectCurrentEula, selectCurrentUser } from "../../redux/user/user.selectors";
import { connect } from "react-redux";
import { FormDatePicker } from "../form-date-picker/form-date-picker.component";
import { INSERT_EULA_ACCEPTANCE } from "../../graphql/user.queries";
import { useMutation } from "@apollo/client";
import { acceptEula } from "../../redux/user/user.actions";
import { useTranslation } from "react-i18next";
import day from '../../utils/day';

import './eula.styles.scss';

const Eula = ({ currentEula, currentUser, acceptEula }) => {
    const [formReady, setFormReady] = useState(false);
    const [hasEverScrolledToBottom, setHasEverScrolledToBottom] = useState(false);
    const [insertEulaAcceptance] = useMutation(INSERT_EULA_ACCEPTANCE);
    const [form] = Form.useForm();
    const markdownCardRef = useRef(null);
    const { t } = useTranslation();
    const [api, contextHolder] = notification.useNotification();

    const handleScroll = (e) => {
        const bottom = e.target.scrollHeight - 100 <= e.target.scrollTop + e.target.clientHeight;
        if (bottom && !hasEverScrolledToBottom) {
            setHasEverScrolledToBottom(true);
        } else if (e.target.scrollHeight <= e.target.clientHeight && !hasEverScrolledToBottom) {
            setHasEverScrolledToBottom(true);
        }
    };

    useEffect(() => {
        handleScroll({ target: markdownCardRef.current });
    }, []);

    const handleChange = useCallback(() => {
        form.validateFields({ validateOnly: true })
            .then(() => setFormReady(hasEverScrolledToBottom))
            .catch(() => setFormReady(false));
    }, [form, hasEverScrolledToBottom]);

    useEffect(() => {
        handleChange();
    }, [handleChange, hasEverScrolledToBottom, form]);

    const onFinish = async ({ acceptTerms, ...formValues }) => {
        const eulaId = currentEula.id;
        const useremail = currentUser.email;

        try {
            const { accepted_terms, ...otherFormValues } = formValues;
            await insertEulaAcceptance({
                variables: {
                    eulaAcceptance: {
                        eulaid: eulaId,
                        useremail,
                        ...otherFormValues,
                        date_accepted: new Date(),
                    }
                }
            });
            acceptEula();
        } catch (err) {
           api.error({
                message: t('eula.errors.acceptance.message'),
                description: t('eula.errors.acceptance.description'),
                placement: 'bottomRight',
                duration: 5000,

            });
            console.log(`${t('eula.errors.acceptance.message')}`);
            console.dir({
                message: err.message,
                stack: err.stack,
            });
        }
    };

    return (
        <>
            {contextHolder}
            <Modal
                title={t('eula.titles.modal')}
                className='eula-modal'
                width={'100vh'}
                open={currentEula}
                footer={() => (
                    <Button
                        className='eula-accept-button'
                        form='tosForm'
                        type="primary"
                        size='large'
                        htmlType="submit"
                        disabled={!formReady}
                        children={t('eula.buttons.accept')}
                    />
                )}
                closable={false}
            >
                    <Card type='inner' className='eula-markdown-card' onScroll={handleScroll} ref={markdownCardRef}>
                        <div id='markdowndiv' className='eula-markdown-div'>
                            <Markdown children={currentEula?.content?.replace(/\\n/g, '\n')} />
                        </div>
                    </Card>

                    <EulaFormComponent form={form} handleChange={handleChange} onFinish={onFinish} t={t} />

                    {!hasEverScrolledToBottom && (
                        <Card className='eula-never-scrolled' type='inner'>
                            <h3>{t('eula.content.never_scrolled')}</h3>
                        </Card>
                    )}
            </Modal>
        </>
    )
}

const EulaFormComponent = ({ form, handleChange, onFinish, t }) => (
    <Card type='inner' title={t('eula.titles.upper_card')} style={{marginTop: '10px'}}>
        <Form id='tosForm' onChange={handleChange} onFinish={onFinish} form={form}>
            <Row gutter={24}>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.first_name')}
                        name="first_name"
                        rules={[{ required: true, message: t('eula.messages.first_name') }]}
                    >
                        <Input placeholder={t('eula.labels.first_name')}
                               aria-label={t('eula.labels.first_name')} />
                    </Form.Item>
                </Col>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.last_name')}
                        name="last_name"
                        rules={[{ required: true, message: t('eula.messages.last_name') }]}
                    >
                        <Input placeholder={t('eula.labels.last_name')}
                               aria-label={t('eula.labels.last_name')} />
                    </Form.Item>
                </Col>
            </Row>
            <Row gutter={24}>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.business_name')}
                        name="business_name"
                        rules={[{ required: true, message: t('eula.messages.business_name') }]}
                    >
                        <Input placeholder={t('eula.labels.business_name')}
                               aria-label={t('eula.labels.business_name')} />
                    </Form.Item>
                </Col>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.phone_number')}
                        name="phone_number"
                        rules={[
                            {
                                pattern: /^(\+\d{1,2}\s?)?1?-?\.?\s?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$/,
                                message: t('eula.messages.phone_number'),
                            }
                        ]}
                    >
                        <Input placeholder={t('eula.labels.phone_number')}
                               aria-label={t('eula.labels.phone_number')} />
                    </Form.Item>
                </Col>
            </Row>
            <Row gutter={24}>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.address')}
                        name="address"
                    >
                        <Input placeholder={t('eula.labels.address')} aria-label={t('eula.labels.address')} />
                    </Form.Item>
                </Col>
                <Col span={12}>
                    <Form.Item
                        label={t('eula.labels.date_accepted')}
                        name="date_accepted"
                        rules={[
                            { required: true },
                            {
                                validator: (_, value) => {
                                    if (day(value).isSame(day(), 'day')) {
                                        return Promise.resolve();
                                    }
                                    return Promise.reject(new Error(t('eula.messages.date_accepted')));
                                }
                            },
                        ]}
                    >
                        <FormDatePicker onChange={handleChange} onlyToday
                                        aria-label={t('eula.labels.date_accepted')} />
                    </Form.Item>
                </Col>
            </Row>
            <Row gutter={24}>
                <Col span={24}>
                    <Form.Item
                        name="accepted_terms"
                        valuePropName="checked"
                        rules={[
                            {
                                validator: (_, value) =>
                                    value ? Promise.resolve() : Promise.reject(new Error(t('eula.messages.accepted_terms'))),
                            },
                        ]}
                    >
                        <Checkbox
                            aria-label={t('eula.labels.accepted_terms')}>{t('eula.labels.accepted_terms')}</Checkbox>
                    </Form.Item>
                </Col>
            </Row>
        </Form>
    </Card>
);

const mapStateToProps = createStructuredSelector({
    currentEula: selectCurrentEula,
    currentUser: selectCurrentUser,
});

const mapDispatchToProps = (dispatch) => ({
    acceptEula: () => dispatch(acceptEula()),
});

export default connect(mapStateToProps, mapDispatchToProps)(Eula);