import React, { useState, useEffect, useRef } from 'react';
import Menu from '../Components/Menu';
import Schedule from '../Components/Schedule';
import styled from 'styled-components';
import moment from 'moment';
import "moment/locale/ko";

moment.locale("ko", {
    week: {
        dow: 1
    }
});

const Drop = styled.div`
    & button {
        border solid 1px;
    }
`

const Tab = styled.ul`
    & a, a:hover, a:active {
        color: black;
    }
`

function Home() {
    const [show, setShow] = useState(false);
    const [weeks, setWeeks] = useState([]);
    const [days, setDays] = useState([]);
    const [sendDate, setSendDate] = useState(null);

    useEffect(() => {
        Dateform();
    }, []);

    function Dateform() {
        let today = moment();
        let weeks = [];
        let dates = [];
        let sendDates = [];
        
        for (let i = 0; i < 6; i++) {
            if (i !== 0) {
                today.add(7, 'd');
            }

            let date = { start: null, end: null };
            date.start = today.startOf('week').format("MMM Do");
            date.end = today.endOf('week').weekday(4).format("MMM Do");
            dates.push(date);
            const week = date.start + "  ~  " + date.end;
            weeks.push(week);

            let sendDate = today.startOf('week').format("YYYY-MM-DD");
            sendDates.push(sendDate);
        };
        setWeeks([...weeks])
        setDays([...sendDates])
    };

    function choose(e, index) {
        setShow(true)
        setSendDate(days[index])
    }

    return (
        <div>
            <Menu />
            <div className="container mt-3">
                <h2>대관 현황</h2>
                <p>
                    <strong>대관 가능 시간</strong>
                    <ul>
                        <li>평일: 9시 - 22시/ 예약가능 시간 이후 폐쇄</li>
                        <li>주말: 이용 불가</li>
                    </ul>
                </p>
                <Drop className="row dropdown mt-1 mb-2">
                    <button className="btn btn-lg dropdown-toggle mx-auto col-5" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        기간을 선택해주십시오.
                    </button>
                    <div className="dropdown-menu col-5" aria-labelledby="dropdownMenuButton">
                        {weeks.map((week, index) => (
                            <a className="dropdown-item" id={index} onClick={(e) => choose(e, index)}>{week}</a>
                        ))}
                    </div>
                </Drop>
                <Tab className="nav nav-tabs nav-justified mt-4" id="myTab" role="tablist" style={show ? {} : { display: "none" }}>
                    <li className="nav-item">
                        <a className="nav-link active" id="7-tab" data-toggle="tab" href="#tab-7" role="tab" aria-controls="7" aria-selected="true"> 7-223 </a>
                    </li>
                    <li className="nav-item">
                        <a className="nav-link" id="9-tab" data-toggle="tab" href="#tab-9" role="tab" aria-controls="9" aria-selected="false"> 9-116 </a>
                    </li>
                    <li className="nav-item">
                        <a className="nav-link" id="25-tab" data-toggle="tab" href="#tab-25" role="tab" aria-controls="25" aria-selected="false"> 25-307 </a>
                    </li>
                </Tab>
                <div className="tab-content row justify-content-center" id="myTabContent" style={show ? {} : { display: "none" }}>
                    <div className="tab-pane fade show active col-md-11 col-12" id="tab-7" role="tabpanel" aria-labelledby="7-tab">
                        <Schedule day={sendDate}/>
                    </div>
                    <div className="tab-pane fade col-md-11 col-12" id="tab-9" role="tabpanel" aria-labelledby="9-tab">
                        <Schedule day={sendDate}/>
                    </div>
                    <div className="tab-pane fade col-md-11 col-12" id="tab-25" role="tabpanel" aria-labelledby="25-tab">
                        <Schedule day={sendDate}/>
                    </div>
                </div>
                <h3>유의사항</h3>
                <p>
                    <ul>
                        <li>강의실을 대관하는 대표자를 기준으로 최대 주 6시간까지 대관이 가능합니다.</li>
                        <li>1회 대관시 최대 3시간까지 이용이 가능합니다. (1시간 단위로 대관 가능)</li>
                        <li><strong style={{ color: "red" }}>대관 시간 이외 강의실을 이용하다 적발될 경우 한달 간 강의실 이용이 불가합니다.</strong></li>
                    </ul>
                </p>
                <div className="bg-white">
                    <h6>고려대학교 대관시스템</h6>
                </div>
            </div>
        </div>
    )
}

export default Home;