import React, { useRef, useEffect, useState, useContext } from 'react';
import { useNavigate, useLocation } from 'react-router-dom';
import { LoadingButton } from '@material-ui/lab';
import IconButton from '@mui/material/IconButton';
import RemoveIcon from '@mui/icons-material/Remove';

import { HeaderContext } from '../../context';
import Alert from '../../component/alert';
import Notification from '../../component/notification';
import PreviewPDF from '../../component/preview_pdf';
import PageLoader from '../../component/page_loader';
import UploadingProgress from '../../component/modal_uploading';


const ParentMeetingAdd = () => {

    const navigator = useNavigate();
    const location = useLocation();
    const { isAuthenticate } = useContext(HeaderContext);

    const father_id = localStorage.getItem('father_id');

    const [notice, setNotice] = useState(-1);

    const [title, setTitle] = useState('');
    const [memo, setMemo] = useState('');
    const [text, setText] = useState('');
    const [pdf, setPdf] = useState('');
    const [pdf_url, setPDFURL] = useState('');
    const [meeting_image, setMeetingImages] = useState([]);
    const [approval_list, setApprovalList] = useState([]);
    const [children_list, setChildrenList] = useState([]);

    const [_422errors, set422Errors] = useState({title:'', text:'', memo:'', pdf:'', image:''})
    const [_400error, set400Error] = useState('');

    const [loaded, setLoaded] = useState(false);
    const [submit, setSubmit] = useState(false);
    const [check_radio, setCheckRadio] = useState('');

    const state = location.state;
    const isMountedRef = useRef(true);

    useEffect(() => {
        isMountedRef.current = false;
        if(isAuthenticate()){
            setLoaded(false);
    
            let clone = localStorage.getItem('cloneMeeting');
            if(clone){
                clone = JSON.parse(clone);
                setLoaded(true);
                setTitle(clone?.title);
                setMemo(clone.memo ? clone.memo: '');
                setText(clone?.text);
                setPdf(clone?.pdf);
                setPDFURL(clone?.pdf);
                let images = [];
                for(let i in clone.meeting_image){
                    images.push(clone.meeting_image[i].image);
                }
                setMeetingImages(images);
                setApprovalList(clone.approval);
                var arr = [];
                for(let i in clone.children){
                    arr.push({...clone.children[i], checked: false})
                }
                setChildrenList(arr);
                if((clone.children.length == clone.approval.length) && clone.approval.length > 0 )
                    setCheckRadio('all_send');
                else if((clone.children.length != clone.approval.length) && clone.approval.length > 0)
                    setCheckRadio('pickup_send');
                else setCheckRadio('');
    
                localStorage.removeItem('cloneMeeting');
            }
            else{
                axios.get('/api/fathers/children/listOfFather', {params:{father_id: father_id}})
                .then(response=>{
                    if(isMountedRef.current) return;
    
                    setLoaded(true);
                    setNotice(response.data.notice);
                    if(response.data.status_code == 200){
                        var list = response.data.params;
                        var arr = [];
                        for(var i in list)
                            arr.push({...list[i], checked: false})
                        setChildrenList(arr);
                        if(list.length > 0)
                            setCheckRadio("all_send");
                        else setCheckRadio('');
                    }
                    else {
                        set400Error("失敗しました。");
                    }
                })
            }
        }

        return () => {
            isMountedRef.current = true;
        }
    },[])


//--------------------------------------------------------
    useEffect(()=>{
        if(!loaded) return;      //if dont load data
        var list = [...children_list];
        if(check_radio=="all_send"){        //send all children
            for(var i=0; i<list.length; i++)
                list[i].checked = true;
        }
        else if(check_radio=="pickup_send"){                     //send pickup
            for(var i in list){
                if(approval_list.findIndex(ele=>ele.child_id == list[i].id) >= 0)
                    list[i].checked = true;
                else list[i].checked = false;
            }
        }
        setChildrenList(list);
    },[check_radio])

//----------------------------------------------------------------------
    const handleSubmit = (e) => {
        e.preventDefault();
        if(isAuthenticate()){
            set422Errors({title:'',memo:'',text:'',pdf:'',image:''});
    
            const formdata = new FormData();
            formdata.append('father_id', father_id);
            formdata.append('title', title);
            formdata.append('text', text);
            formdata.append('memo', memo);
            formdata.append('pdf', pdf);
            formdata.append('image', JSON.stringify(meeting_image));
            let c_arr = [];
            for(let i in children_list){
                if(children_list[i].checked) c_arr.push(children_list[i].id);
            }
            formdata.append('children', JSON.stringify(c_arr));
    
            setSubmit(true);
    
            axios.post('/api/fathers/meetings/register', formdata)
            .then(response => {
                if(isMountedRef.current) return;
    
                setNotice(response.data.notice);
                setSubmit(false);
                switch(response.data.status_code){
                    case 200: {
                        const meeting_id = response.data.params.meeting_id;
                        navigator(`/p-account/meeting/detail/${meeting_id}`,  { state: "登録成功しました" });
                        break;
                    }
                    case 400: set400Error("登録失敗しました。"); break;
                    case 422: window.scrollTo(0, 0); set422Errors(response.data.error_messages); break;
                }
            });
        }
    }


    const handleImageChange = (e) => {
        e.preventDefault();
        if(isAuthenticate()){
            const files = Array.from(e.target.files);
            if(e.target.files.length + meeting_image.length > 10)
            {
                set400Error("画像は最大10個までです。");
                return;
            }
            const promises = files.map(_file => {
                return (new Promise((resolve, reject) => {
                    const reader = new FileReader();
                    reader.addEventListener('load', (ev) => {
                        resolve(ev.target.result);
                    });
                    reader.addEventListener('error', reject);
                    reader.readAsDataURL(_file);
                }))
            });
    
            Promise.all(promises).then(images => {
                setMeetingImages([...meeting_image, ...images]);
            },
            error => { console.error(error); });
        }
    };

    const handlePDFChange = (e) => {
        e.preventDefault();
        let reader = new FileReader();
        let _file = e.target.files[0];
        if(!_file) return;
        setPDFURL(URL.createObjectURL(_file))
        reader.readAsDataURL(_file);
        reader.onloadend = () => {
            setPdf(reader.result);
        }
    }

    const handleRemoveImage = (image_id) => {
        let list = [...meeting_image];
        list.splice(image_id, 1);
        setMeetingImages(list);
    }

    const handleCheck = (e, index) => {
        var list = [...children_list];
        list[index].checked = e.target.checked;
        setChildrenList(list);
    }


	return (
    <div className="l-content">
        <div className="l-content-w560">
            <div className="l-content__ttl">
                <div className="l-content__ttl__left">
                    <h2>ミーティング作成</h2>
                </div>
                <Notification notice={notice}/>
            </div>

            <div className="l-content-wrap">
                <div className="p-article">
                    <div className="p-article-wrap position-relative" style={{ minHeight:'500px'}}>
                    {
                        !loaded && <PageLoader />
                    }
                    {
                        loaded &&
                        <article className="p-article__body">
                            <div className="p-article__content">
                                <div className="p-article__context">
                                    <form className="edit-form" onSubmit={handleSubmit}>
                                        <div className="edit-set">
                                            <label className="control-label" htmlFor="title">タイトル</label>
                                            <input type="text" name="title"   value={ title } onChange={e=>setTitle(e.target.value)} className={`input-default input-title input-h60 input-w480 ${  _422errors.title && 'is-invalid c-input__target'} `} id="title" />
                                            {
                                                _422errors.title &&
                                                    <span className="l-alert__text--error ft-16 ft-md-14">
                                                        {_422errors.title}
                                                    </span>
                                            }
                                        </div>
                                        <div className="edit-set">
                                            <label className="control-label" htmlFor="meeting_textarea">本文</label>
                                            <textarea value={ text ? text:'' } onChange={e=>setText(e.target.value)} rows="8" className={`textarea-default  ${  _422errors.text && 'is-invalid c-input__target'} `}  id="meeting_textarea" />
                                            {
                                                _422errors.text &&
                                                    <span className="l-alert__text--error ft-16 ft-md-14">
                                                        {_422errors.text}
                                                    </span>
                                            }
                                        </div>
                                        <div className="edit-set">
                                            <label className="control-label" htmlFor="meeting_textarea">メモ</label>
                                            <textarea value={ memo ? memo:'' } onChange={e=>setMemo(e.target.value)}  rows="8" className={`textarea-default  ${  _422errors.memo && 'is-invalid c-input__target'} `} id="meeting_textarea" />
                                            {
                                                _422errors.memo &&
                                                    <span className="l-alert__text--error ft-16 ft-md-14">
                                                        {_422errors.memo}
                                                    </span>
                                            }
                                        </div>
                                        <div className="edit-set edit-set-mt15">
                                            <label className="edit-set-file-label" htmlFor="file_pdf">
                                                PDFアップロード
                                                <input type="file" name="file_pdf" accept=".pdf" id="file_pdf" onChange={handlePDFChange} onClick={(e) => { e.target.value = null; }} />
                                            </label>
                                            {
                                                pdf &&
                                                <IconButton
                                                    onClick={()=>{setPdf(''); setPDFURL('');}}
                                                    style={{position: 'absolute',
                                                        top: '-6px',
                                                        right: '-6px'}}>
                                                    <RemoveIcon
                                                        style={{width:'22px', height:'22px',
                                                        color: 'white',
                                                        background: '#dd0000',
                                                        borderRadius: '50%'}}/>
                                                </IconButton>
                                            }
                                            {
                                                _422errors.pdf &&
                                                <span className="l-alert__text--error ft-16 ft-md-14">
                                                    {_422errors.pdf}
                                                </span>
                                            }
                                            <PreviewPDF pdf_url={pdf_url}></PreviewPDF>
                                        </div>
                                        <div className="edit-set edit-set-mt15">
                                            <label className="edit-set-file-label" htmlFor={meeting_image.length < 10 ? 'file_image': ''}>
                                                画像アップロード
                                                <input type="file"  multiple="multiple" name="file_image[]" accept=".png, .jpg, .jpeg" id="file_image"  onChange={handleImageChange}/>
                                            </label>
                                            {
                                                _422errors.image &&
                                                <span className="l-alert__text--error ft-16 ft-md-14">
                                                    {_422errors.image}
                                                </span>
                                            }
                                        </div>

                                        <div className="p-file-image justify-content-start">
                                        {
                                            meeting_image?.map((x, k)=>
                                                <figure className="image-upload" key={k}>
                                                    <img src={x} alt={x} />
                                                    <IconButton
                                                        onClick={e=>handleRemoveImage(k)}
                                                        style={{position: 'absolute',
                                                            bottom: '-6px',
                                                            right: '-6px'}}>
                                                        <RemoveIcon
                                                            style={{width:'22px', height:'22px',
                                                            color: 'white',
                                                            background: '#dd0000',
                                                            borderRadius: '50%'}}/>
                                                    </IconButton>
                                                </figure>
                                            )
                                        }
                                        {
                                            [...Array(10-meeting_image.length)]?.map((x, k)=>
                                                <figure className="image-upload" key={k}></figure>
                                            )
                                        }
                                        </div>

                                        <div className="edit-set edit-set-send">
                                            <label htmlFor="all_send">
                                                <input className="boolean optional"
                                                    type="radio"
                                                    id="all_send"
                                                    name="check_radio"
                                                    value={false}
                                                    onChange={e=>setCheckRadio(e.target.id)}
                                                    checked = {(check_radio == 'all_send')? true : false}
                                                    disabled = {children_list.length == 0 ? true : false}
                                                />
                                                <span className="lbl padding-16">全員に送信</span>
                                            </label>
                                        </div>

                                        <div className="edit-set-mt5 edit-set-send">
                                            <label htmlFor="pickup_send">
                                                <input className="boolean optional"
                                                    type="radio"
                                                    id="pickup_send"
                                                    name="check_radio"
                                                    onChange={e=>setCheckRadio(e.target.id)}
                                                    checked = {(check_radio == 'pickup_send') ? true : false}
                                                    disabled = {children_list.length == 0 ? true:false}
                                                />
                                                <span className="lbl padding-16">選んで送信</span>
                                            </label>
                                        </div>

                                        <div className={`checkbox-wrap edit-bg d-none ${(check_radio == "pickup_send") && 'd-block'}`}>
                                            {
                                                children_list.length > 0 ?
                                                children_list?.map((item, k)=>
                                                        <div className="checkbox" key={k}>
                                                            <label htmlFor={`user_name${k}`}>
                                                                <input className="boolean optional"
                                                                    type="checkbox"
                                                                    id={`user_name${k}`}
                                                                    checked =  {item.checked}
                                                                    onChange={e=>handleCheck(e, k)}/>
                                                                <span className="lbl padding-16">
                                                                    {`${item.last_name} ${item.first_name}`}
                                                                </span>
                                                            </label>
                                                        </div>
                                                    )
                                                : <p className="text-center">子はありません。</p>
                                            }
                                        </div>
                                        <div className="edit-set edit-set-mt15">
                                            <p>PDFの容量/画像の容量が大きいと送信までに5分ほどかかる恐れがあります。容量を圧縮してからアップロードをお勧めします。</p>
                                        </div>
                                        <UploadingProgress show={submit}/>

                                        <LoadingButton
                                            type="submit" fullWidth
                                            loading={submit}
                                            className="btn-edit btn-default btn-h75 bg-yellow rounded-15">
                                            <span className={`ft-18 ft-xs-16 font-weight-bold ${!submit && 'text-black'}`}>ミーティングを登録</span>
                                        </LoadingButton>
                                        {  _400error && <Alert type="fail" hide={()=>set400Error('')}>{_400error}</Alert>  }
                                    </form>
                                </div>
                            </div>
                        </article>
                    }
                    </div>
                </div>
            </div>
        </div>
    </div>
	)
}

export default ParentMeetingAdd;