// Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Identifier: AGPL-3.0

import React, { ReactElement, ReactNode, useState } from 'react';
import { Button, Grid } from "@material-ui/core";
import { GridProps } from '@material-ui/core/Grid';
import { isArray } from 'lodash';
import { DefaultView } from 'components/default-view/default-view';
import { InfoIcon } from 'components/icon/icon';
import { ReactNodeArray } from 'prop-types';

interface MPVHideablePanelDataProps {
    name: string;
    visible: boolean;
    children: ReactNode;
}

interface MPVHideablePanelActionProps {
    doHidePanel: () => void;
}

type MPVPanelProps = MPVHideablePanelDataProps & MPVHideablePanelActionProps;

const MPVHideablePanel = ({doHidePanel, name, visible, ...props}: MPVPanelProps) =>
    visible
    ? <>
        {React.cloneElement((props.children as ReactElement), { doHidePanel, panelName: name })}
    </>
    : null;

interface MPVPanelContentDataProps {
    panelName?: string;
    children: ReactElement;
}

interface MPVPanelContentActionProps {
    doHidePanel?: () => void;
}

type MPVPanelContentProps = MPVPanelContentDataProps & MPVPanelContentActionProps & GridProps;

// Grid item compatible component for layout and MPV props passing
export const MPVPanelContent = ({doHidePanel, panelName, ...props}: MPVPanelContentProps) =>
    <Grid item {...props}>
        {React.cloneElement(props.children, { doHidePanel, panelName })}
    </Grid>;

export interface MPVContainerDataProps {
    panelNames?: string[];
}

type MPVContainerProps = MPVContainerDataProps & GridProps;

// Grid container compatible component that also handles panel toggling.
export const MPVContainer = ({children, panelNames, ...props}: MPVContainerProps) => {
    if (children === undefined || children === null || children === {}) {
        children = [];
    } else if (!isArray(children)) {
        children = [children];
    }
    const visibility = (children as ReactNodeArray).map(() => true);
    const [panelVisibility, setPanelVisibility] = useState<boolean[]>(visibility);

    let panels: JSX.Element[] = [];
    let toggles: JSX.Element[] = [];

    if (isArray(children)) {
        for (let idx = 0; idx < children.length; idx++) {
            const toggleFn = (idx: number) => () => {
                setPanelVisibility([
                    ...panelVisibility.slice(0, idx),
                    !panelVisibility[idx],
                    ...panelVisibility.slice(idx+1)
                ])
            };
            const toggleLabel = panelVisibility[idx] ? 'Hide' : 'Show'
            const panelName = panelNames === undefined
                ? `Panel ${idx+1}`
                : panelNames[idx] || `Panel ${idx+1}`;


            toggles = [
                ...toggles,
                <Button onClick={toggleFn(idx)}>{toggleLabel} {panelName}</Button>
            ];

            const aPanel =
                <MPVHideablePanel visible={panelVisibility[idx]} name={panelName} doHidePanel={toggleFn(idx)}>
                    {children[idx]}
                </MPVHideablePanel>;
            panels = [...panels, aPanel];
        };
    };

    return <Grid container {...props}>
        { toggles }
        { panelVisibility.includes(true)
            ? panels
            : <Grid container alignItems='center' justify='center'>
                <DefaultView messages={["All panels are hidden.", "Click on the buttons above to show them."]} icon={InfoIcon} />
            </Grid> }
    </Grid>;
};