import React, {useState, useEffect, useMemo, useRef, Fragment}  from 'react';
import logo from './logo.svg';
import './App.css';
import Select from 'react-select/async'
import {sortableContainer, sortableElement} from 'react-sortable-hoc';
import Dropzone from 'react-dropzone'

import { GraphQLClient } from 'graphql-request';

import createModels2 from './front-models'

let gql;

const getGQL = () => new GraphQLClient(localStorage.url + 'graphql', {headers: localStorage.authToken ? {Authorization: 'Bearer '+localStorage.authToken} : {}})
if (localStorage.authToken && localStorage.url){
    gql = getGQL()
}

const ShortName = ({record, options}) => { 
    if (record && record.constructor)
        if (options.view.relations[record.constructor.name]){
            const Formatter = options.view.relations[record.constructor.name]
            return <Formatter options={options}>{record}</Formatter>
    }
    return (<>{record && (record.name || record.key || record.login || record.originalFileName || record._id)}</>)
}



const EditFormRow = ({field, models={}, value, options=defaultAdminOptions, record, onChange}) => {
    return (
        <tr>
            <th>{field.name}</th>
            <td><Cell models={models} model={getModelByField(field, models)} options={options} record={record} field={field} selected onChange={onChange}>{value}</Cell></td>
        </tr>
    )
}

const EditForm = ({record, models={}, model, options=defaultAdminOptions, Components:{EditFormRow:EFR}={EditFormRow}}) => {
    const [edit, setEdit] = useState({...record})

    if (!record) return <></>

    if (!record.save || !record._id){
        Object.assign(record, edit)
    }

    const fields =  model.fields
    const onlyInputs = model.inputs.filter(input => !fields.find(field => field.name === input.name))
    return (
        <>
            <table>
                <tbody>
                {Object.entries(fields).map(([key,field]) => <EFR key={key} field={field} 
                                                                   models={models}
                                                                   record={record} 
                                                                   value={edit[field.name]} 
                                                                   options={options}
                                                                   onChange={event => { 
                                                                       setEdit({...edit, [field.name]: event && event.target ? event.target.value : event})
                                                                   }}
                                                                    />)}
                {Object.entries(onlyInputs).map(([key,field]) => <EFR key={key} field={field} 
                                                                   models={models}
                                                                   record={record} 
                                                                   value={edit[field.name]} 
                                                                   options={options}
                                                                   onChange={event => setEdit({...edit, [field.name]: event && event.target ?  event.target.value : event})}
                                                                    />)}

                </tbody>
            </table>
            {record._id && record.save && 
            <button onClick={() => {
                Object.assign(record, edit);
                if ('_id' in record && 'save' in record)
                    record.save()
            }}>
                Save
            </button>}
        </>
    )
}

const Row = ({top, selected, children}) => { 
    console.log('row')
    return (
        <>
            <div className={`Row ${selected ? 'selected' : ''}` } >
                {children}
            </div>
        </>
    )
}

const Cell = ({children, options, record, field, selected, model, models={}, onClick, ...props}) => {
        
    let Formatter = React.Fragment
    const type = (children && typeof children === 'object' && children.constructor) || model

    const viewOrEdit = (!record.constructor.inputs || record.constructor.inputs.some(input => input.name === field.name)) && selected ? 'edit' : 'view'
    const typeName   = field.type.name || field.type.ofType.name
    if (typeName in options[viewOrEdit].formatters){
        Formatter = options[viewOrEdit].formatters[typeName]
    }
    if (field.name in options[viewOrEdit].fields){
        Formatter = options[viewOrEdit].fields[field.name]
    }
    if (type){ 
        if (type.name in options[viewOrEdit].formatters)
            Formatter = options[viewOrEdit].formatters[type.name]
        else
            Formatter = options[viewOrEdit].formatters.Object
    }


    return( 
        <div className='Cell' onClick={onClick}>
            <Formatter record={record} options={options} model={model} models={models} {...props} field={field}>
                  {Formatter === React.Fragment ? (children && children.toString()) : children}
            </Formatter>
        </div>
    )
}


const ModelListItem = "div"

const ModelList = ({models, selected, onChange, Item=ModelListItem}) => {
    return (
        <aside>
            {Object.entries(models).map(([name, model]) => {
                return (
                    <Item key={name} 
                                   selected={name === selected}
                                   className={name === selected ? "selected" : undefined}
                                   onClick = {() => onChange(name)}
                                   >
                        {name}
                    </Item>
                )
            })}
        </aside>
    )
}

const Search = ({...props}) => 
<input placeholder="Search..." {...props} className="Search"/>

const Count = ({...props}) => <div className="Count" {...props} /> 

const searchQueryBuilder = (search, model) => {
    if (!search) return {}
    const queryRegexp = `/${search.trim().split(/\s+/).join('|')}/`
    return {$or: model.fields.filter(field => field.type.kind == 'SCALAR').map(field => ({[field.name]: queryRegexp}))}
}

const GridHeaderItem = ({field, sort:[sort], ...props}) => 
<div className="GridHeaderItem" {...props}>
    {field.name in sort && sort[field.name] === -1 && '^ '}
    {field.name}
    {field.name in sort && sort[field.name] === 1 && ' v'}
</div>



const GridHeader = ({fields, sort, onSort}) => 
<div className="GridHeader">
    {fields.map(field => <GridHeaderItem key={field.name} field={field} sort={sort} onClick={() => onSort(field.name)}/>)}
</div>

const getModelByField = (field, models={}) => {
    if (field.type.kind === 'OBJECT') {
        return models[field.type.name]
    }
    if (field.type.kind === 'LIST') return models[field.type.ofType.name]
}

const VirtualScroll = ({options, gridHeight, count, rowHeight,  onScroll, records, skip, models={}}) => { 
    const limit = gridHeight/rowHeight
    //const {Row, Cell} = Components

    const [edit, setEdit] = useState({field: null, record: null})

    useEffect(() => setEdit({field: null, record: null}), [records])

    const fields = records && records[0] && records[0].constructor.fields

    //console.log(Fragment, Row)


    return (
    <>
        <div className='GridViewport' 
             style={{maxHeight: gridHeight, height: gridHeight}} >
            <div className='GridContent' 
                 style={{height: count*rowHeight, minHeight: count*rowHeight, maxHeight: count*rowHeight}} >
                {records && records.map((record,i) =><Fragment key={i}> 
                                                {edit.record && edit.record._id === record._id ? <EditForm model={record.constructor} models={models} record={record} options={options}/>: 
                                                <Row options={options}>
                                                    {fields.map(field => 
                                                        <Cell models={models} model={getModelByField(field, models)} record={record} key={field.name} field={field} options={options} 
                                                                onClick={() => setEdit({record: {...record}, field})}>
                                                            {record[field.name]}
                                                        </Cell>)}
                                                </Row>}
                    </Fragment>
                )}
            </div>
        </div>
    </>
    )
}




const ModelView = ({model, models={}, options, components:Components={Search, Count, GridHeader, Grid:VirtualScroll}, rowHeight=150, gridHeight=500, overload=2}) => {



    const [records, setRecords] = useState([])


    const [search, setSearch] = useState("")
    const [count, setCount]   = useState(0)

    const [query,  setQuery]  = useState({})
    const [cursorCalls,  setCursorCalls]  = useState({sort:[{}], skip: [0]/*, limit: [gridHeight/rowHeight]*/})

    const skip = cursorCalls.skip[0]

    console.log(cursorCalls)

    useEffect(() => {
        model.count(query, cursorCalls).then(count => setCount(count))
        model.find(query, cursorCalls).then(records => Promise.all(records)).then(records => setRecords(records))
    }, [query, model, cursorCalls])

    const timeout = useRef(0)
    useEffect(() => {
        clearInterval(timeout.current)
        if (!search) 
            setQuery(searchQueryBuilder(search, model))
        else {
            timeout.current = setTimeout(() => {
                setQuery(searchQueryBuilder(search, model))
            },1000)
        }
    },[search, model])

    //console.log(Components)
    //
    const Add = options.add[model.name] || "button"

    return (
        <>
                <Components.Search options={options} value={search} onChange={({target: {value}}) => setSearch(value)}/>
                <Components.Count options={options}>   
                    {count}
                </Components.Count> 
                <Components.GridHeader fields={model.fields} 
                            sort={cursorCalls.sort} 
                            onSort={sort => setCursorCalls({...cursorCalls,
                                sort: [{[sort]: cursorCalls.sort[0][sort] === 1 ? -1 : 1}]
                            })}/>

                <Add onClick={() => { 
                    if (Add === 'button') (new model).save()
                    setCursorCalls({...cursorCalls, sort: [{_id: -1}]})
                    setSearch('')
                }} model={model}>+</Add>
                {records && <Components.Grid 
                                models={models}
                                options={options}
                                skip={skip}
                                count={count}
                                records={records}
                                gridHeight={700} 
                                rowHeight={50} 
                                onScroll={(skip, limit) =>  {
                                    limit = undefined;
                                    model.find(query, {...cursorCalls, limit: [limit], skip: [skip]}).then(records => Promise.all(records)).then(records => setRecords(records)).then(() =>
                                    setCursorCalls({...cursorCalls, limit: [limit], skip: [skip]}))
                                }}/> }
        </>
    )
}


const ObjectShortView = ({children, options}) => {
    const [record, setRecord] = useState(children)
    if (!children) return <></>
    if (typeof children === 'object' && 'then' in children){
        children.then(child => setRecord({...child}))
    }
    if (typeof children === 'object' && children._id){
        return (
        <div className="ObjectShortView">
            <ShortName record={record} options={options}/>
        </div>
        )
    }
    else {
        return (
            <pre>
            {JSON.stringify(record, null, 4)}
            </pre>
        )
    }
}

const ForeignAutocomplete = ({models={}, children:value, onChange, model, options={}}) => {
    return (
         <Select cacheOptions 
                defaultOptions 
                placeholder={model.name}
                loadOptions={async search => {
                    const suggesions = await model.find(searchQueryBuilder(search, model)) || []
                    return [{_id: null, key: 'REMOVE'}, ...suggesions]//.filter(record => !exclude.find(e => (e === record._id) || (e._id === record._id)))
                        .map((record) => ({value: record._id, label: <ShortName record={record} options={options}/>, record}))
            
                }}
                value={value && {value: value._id, label: <ShortName record={value} options={options}/>, record: value}}
                onChange={(obj) => {
                    onChange(obj.record._id ? obj.record : null)
                }}
                />
    )
}

const ObjectShortEdit = ({...props}) =>
<>
    <ForeignAutocomplete {...props}/>
</>

const SortableCell = sortableElement(({onAdd, onDelete, onCh, ...props}) => 
<div className='SortableCell'>
    <button onClick={onAdd}>+</button>
    <button onClick={onDelete}>x</button>
    <Cell onChange={onCh} {...props} />
</div>)
const SortableContainer = sortableContainer(({children}) => {
  return <div>{children}</div>;
});


const arrayMove = (arr, newIndex, oldIndex) => {
    const withoutOld = arr.filter((item, i) => i !== oldIndex)
    return [...withoutOld.slice(0, newIndex), arr[oldIndex], ...withoutOld.slice(newIndex)]
}

const defaultAdminOptions = 
    {
        view: {
            formatters:{
                ID: ({children}) => <b>{children && children.slice(-6).toUpperCase()}</b>,
                String: ({children}) => <>{children && children.length > 100 ? children.slice(0,100) + '...' : children}</>,
                Object: ObjectShortView,
                Array: ({children, ...props}) => <>{children.map((child,i) => <ObjectShortView key={child && (child._id || child.key || child.name) || i} children={child} {...props}/>)}</>
            },
            fields:{
                createdAt: ({children}) => <>{new Date(+children).toISOString()}</> ,
                url: ({children,record}, type, url) =>  <>
                                                {(url = localStorage.url + record.url), null}
                                                {(type = (record.mimeType && record.mimeType.split('/')[0]) || 'image') === 'image' ?
                                                <img className="rowView" src={url}/> : 
                                                <video className="rowView" autoplay controls>
                                                    <source src={url}/>
                                                </video>}
                                        <a href={children} className='Media'>
                                            {children}
                                        </a></>,
                color: (props)   => <span style={{backgroundColor: props.value}}>{props.value}</span>,
                size:   ({children}) => <>{(['B', 'K','M','G','T'].reduce((result, letter, i, value) => result ? result : (value = (children/1024**i)) < 1024 ? `${value.toFixed(2)} ${letter}`:  '', ''))}</>
            },
            relations: {
                Image: ({children}) => <span className="ImageRelation"><img src={localStorage.url + children.url}/>{children.originalFileName}</span>,
                Content: ({children}) => <span className="ImageRelation"><img src={localStorage.url + children.url}/>{children.originalFileName}</span>
            },
            models: {

            }
        },

        edit: {
            formatters:{
                ID: ({children}) => <b>{children && children.slice(-6).toUpperCase()}</b>,
                String: ({children, field, ...props}) => <textarea placeholder={field.name} value={children} {...props}/>,
                Int: ({children, ...props}) => <input type='number' value={children} {...props}/>,
                Float: ({children, ...props}) => <input type='number' value={children}  {...props} onChange={(e) => props.onChange(+e.target.value)}/>,
                Object: ({children, options, model, models, ...props}) => {
                    return model.fields[0].name === '_id' ? <ObjectShortEdit children={children} options={options} model={model} {...props}/> : <EditForm model={model} models={models} record={children} options={options} />
                },
                Array: ({children, onChange, model, ...props}) => {
                    const newItem = !model || (model && model.fields[0].name === '_id') ? null : new model

                    return (<><SortableContainer 
                                    pressDelay={200}
                                    onSortEnd={({newIndex, oldIndex}) => {
                                        onChange(arrayMove(children, newIndex, oldIndex))
                                }}>{children.map((child, i) => 
                                    <SortableCell onDelete={() => onChange(children.filter((item, j) => j !== i))} 
                                                  onAdd={() => onChange([...children.slice(0, i),newItem,...children.slice(i)])}  
                                                index={i} key={(child && (child._id || child.key || child.name)) || i} model={model} {...props} children={child} selected 
                                            onCh={data => {
                                                            data = (data && data.target) ?  data.target.value : data
                                                            console.log(data, children)
                                                            if (!children.find(record => record && record._id && record._id === data._id)){
                                                                const copy = [...children]
                                                                copy[i] = data
                                                                onChange(copy)
                                                            }
                                            }}
                                        />)}
                        </SortableContainer>
                        <button onClick={() => onChange([...children, newItem])}>+</button></>)
                }
            },
            fields:{
                createdAt: ({children}) => <input value={new Date(+children).toISOString()} />,
                url: ({children}) => <a href={children}>{children}</a>,
                color:({children, ...props}) => <input type='color' value={children} {...props}/>
            },
            
            models: {

            }
        },

        add: {
            Content({model, onClick}){
                return (
                    <Dropzone onDrop={async acceptedFiles => {
                        await Promise.all(acceptedFiles.map(file => {
                            const body = new FormData
                            body.append('upload',file)
                            fetch(`${localStorage.url}upload`, {
                                method: "POST",
                                headers: localStorage.authToken ? {Authorization: 'Bearer ' + localStorage.authToken} : {},
                                body
                            })
                        }))
                        onClick()
                    }
                    }>
                    {({getRootProps, getInputProps}) => (
                        <section className='drop'>
                        <div {...getRootProps()}>
                        <input {...getInputProps()} />
                        <p>Drag 'n' drop some files here, or click to select files</p>
                        </div>
                        </section>
                    )}
                        </Dropzone>
                )
            }
        }
    }


const Admin = ({models, components:{ModelList:ML=ModelList, Search:S=Search, ModelListItem:MLI=ModelListItem, ModelView:MV=ModelView, Count:C=Count, GridHeader:GH=GridHeader, Grid:G=VirtualScroll}={},
                options=defaultAdminOptions
                }) => {
    const [selected, setSelected] = useState()

    const mergedOptions = {...defaultAdminOptions, ...options}


    return (
        <>
            <ML Item={MLI} models={models} onChange={(name) => setSelected(name)} selected={selected}/>
            <content>
                {selected && <MV models={models} options={mergedOptions} model={models[selected]} components={{Search: S, Count: C, GridHeader:GH, Grid:G}} /> }
            </content>
        </>
    )
}

const LoginForm = ({onLogin}) => {
    const [url, setUrl] = useState(localStorage.url)
    const [login, setLogin] = useState('')
    const [password, setPassword] = useState('')
    return ( 
        <>
            <input placeholder="url" value={url} onChange={e => setUrl(e.target.value)}/>
            <input placeholder='login' value={login} onChange={e => setLogin(e.target.value)}/>
            <input type='password' placeholder='password' value={password} onChange={e => setPassword(e.target.value)}/>
            <button onClick={() => {
                onLogin({url, login, password})
            }}>Login</button>
        </>
    )
}


function App() {
    let [models, setModels] = useState()
    models || createModels2(gql).then(models => setModels(models))

    const classes = models

    return (
        <>
            <LoginForm onLogin={async ({url, login, password}) => {
                let gql = new GraphQLClient(url + 'graphql')
                let token = await gql.request(`query login ($login: String, $password: String){
                    login(login: $login, password: $password)
                }`, {login, password})
                if (token.login){
                    localStorage.authToken = token.login
                    localStorage.url = url
                }
                else {
                    localStorage.removeItem('authToken')
                }
                gql = getGQL()
                createModels2(gql).then(models => setModels(models))
            }}/>
            <div className="App">
                {models && <Admin models={models} />}
            </div>
        </>
    );
}

export default App;