/**
 * Copyright 2020 Baidu Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type {Indicator, ListItem} from '../types';
import {useCallback, useMemo, useState} from 'react';

export default function useGraph(indicators: Indicator[], list: ListItem[]) {
    const selectedIndicators = useMemo(() => indicators.filter(i => i.selected), [indicators]);

    const [sessionData, setSessionData] = useState<ListItem | null>(null);
    const [showMetricsGraph, setShowMetricsGraph] = useState(false);

    const onHover = useCallback(
        (index: number | null) => {
            if (!showMetricsGraph) {
                setSessionData(index == null ? null : list[index]);
            }
        },
        [list, showMetricsGraph]
    );

    const onSelect = useCallback(
        (index: number | null) => {
            setSessionData(index == null ? null : list[index]);
            setShowMetricsGraph(index != null);
        },
        [list]
    );

    return {
        selectedIndicators,
        sessionData,
        onHover,
        onSelect,
        showMetricsGraph
    };
}
