import React from 'react';
import PropTypes from 'prop-types';

import { VirtualScrollList } from 'dynamic-virtual-scroll/VirtualScrollList.js';
import { Spinner24 } from './LoadingOverlay.js';

/**
 * Наследование компонентов react-toolbox'а делается, но через такую жопууууу....
 */
import { Input } from 'react-toolbox/lib/input';
import { Chip } from 'react-toolbox/lib/chip';
import { autocompleteFactory } from 'react-toolbox/lib/autocomplete/Autocomplete.js';
import autocomplete_theme from 'react-toolbox/lib/autocomplete/theme.css';
import { themr } from 'react-css-themr';
import { AUTOCOMPLETE } from 'react-toolbox/lib/identifiers.js';

const RawAutocomplete = autocompleteFactory(Chip, Input);

/**
 * Автокомплит для отображения БОЛЬШОГО ДЕРЕВА
 */
class RawVirtualTreeAutocomplete extends RawAutocomplete
{
    static propTypes = {
        ...RawAutocomplete.constructor.propTypes,
        maxHeight: PropTypes.number,
        parentIdField: PropTypes.string.isRequired,
        leafOnly: PropTypes.bool,
        renderItem: PropTypes.func,
    }

    tree = []

    renderSuggestion = (idx) =>
    {
        const { theme } = this.props;
        const item = this.tree[idx];
        if (!item)
        {
            return null;
        }
        const key = item.item[this.props.valueKey];
        const enabled = !this.props.leafOnly || !this.by_parent[key];
        const style = { paddingLeft: (10+item.level*16)+'px', color: enabled ? '' : 'gray' };
        if (this.valueHash[key])
        {
            style.background = '#e5e8ea';
        }
        let text;
        if (this.props.renderItem)
        {
            text = this.props.renderItem(item.item, item.level, style);
        }
        else
        {
            text = item.item[this.props.labelKey];
        }
        return (<div
            id={key}
            onMouseDown={enabled ? this.handleMouseDown : undefined}
            onMouseOver={enabled ? this.handleSuggestionHover : undefined}
            className={theme.suggestion+(this.state.active == key ? ' '+theme.active : '')}
            key={key}
            style={style}>
            {text}
        </div>);
    }

    setListScroll = (e) =>
    {
        if (e)
        {
            let k = null;
            for (let i in this.valueHash)
            {
                k = i;
                break;
            }
            if (k)
            {
                // Если есть значение, при изначальном появлении списка проскроллим к нему
                let pos = this.tree.findIndex(e => e.item[this.props.valueKey] == k);
                e.scrollToItem(pos);
            }
        }
    }

    renderSuggestionList()
    {
        const { theme } = this.props;
        const { top, bottom, maxHeight, left, width } = this.state;
        let maxh = Number((''+maxHeight).replace('px', ''));
        if (this.props.maxHeight && maxh > this.props.maxHeight)
        {
            maxh = this.props.maxHeight;
        }
        return (<div style={{position: 'absolute', top, left, width, maxHeight}}>
            <VirtualScrollList
                className={theme.suggestions}
                style={{maxHeight: maxh+'px', bottom, position: 'absolute'}}
                header={((!this.props.source||[]).length ? <div><Spinner24 /> Идёт загрузка...</div> : null)}
                totalItems={(this.tree||[]).length}
                minRowHeight={36}
                viewportHeight={maxh}
                renderItem={this.renderSuggestion}
                ref={this.setListScroll}
            />
        </div>);
    }

    addItems(parent, level, add_all)
    {
        for (let item of this.by_parent[parent]||[])
        {
            if (add_all || !this.filtered || this.filtered[item[this.props.valueKey]])
            {
                this.tree.push({ item, level });
                this.addItems(item[this.props.valueKey], level+1, add_all || this.filtered && this.filtered[item[this.props.valueKey]] == 2);
            }
        }
    }

    render()
    {
        if (this.state.focus)
        {
            if (this.props.source != this.prevSource)
            {
                this.state.expanded = {};
                const pf = this.props.parentIdField;
                const idf = this.props.valueKey;
                let by_parent = {};
                let by_id = {};
                for (let item of this.props.source)
                {
                    by_id[item[idf]] = item;
                    by_parent[item[pf]||''] = by_parent[item[pf]||''] || [];
                    by_parent[item[pf]||''].push(item);
                }
                this.by_id = by_id;
                this.by_parent = by_parent;
            }
            if (this.state.expanded != this.prevExpanded ||
                this.state.query != this.prevQuery)
            {
                if (this.state.query != this.prevQuery ||
                    this.props.source != this.prevSource)
                {
                    this.filtered = null;
                    if (this.state.query)
                    {
                        const pf = this.props.parentIdField;
                        this.filtered = {};
                        for (let k of this.suggestions().keys())
                        {
                            this.filtered[k] = 2;
                            let c = k;
                            while (c)
                            {
                                this.filtered[c] = this.filtered[c] || 1;
                                if (!this.by_id[c])
                                    break;
                                c = this.by_id[c][pf];
                            }
                        }
                    }
                }
                // FIXME Здесь могло быть ваше раскрытие узлов дерева
                this.tree = [];
                this.addItems('', 0, false);
            }
            if (!this.valueHash || this.props.value != this.prevValue)
            {
                if (!this.props.value)
                {
                    this.valueHash = {};
                }
                else if (this.props.multiple)
                {
                    this.valueHash = (this.props.value instanceof Array
                        ? this.props.value.reduce((a, c) => { a[c] = true; return a; }, {})
                        : this.props.value);
                }
                else
                {
                    this.valueHash = { [this.props.value]: true };
                }
            }
            this.prevExpanded = this.state.expanded;
            this.prevQuery = this.state.query;
            this.prevSource = this.props.source;
            this.prevValue = this.props.value;
        }
        return super.render();
    }
}

export const VirtualTreeAutocomplete = themr(AUTOCOMPLETE, autocomplete_theme, { withRef: true })(RawVirtualTreeAutocomplete);