/*
Copyright 2019 - 2022 The Matrix.org Foundation C.I.C.

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 React, { ReactNode, useEffect } from "react";
import { uniqBy } from "lodash";
import { MatrixEvent } from "matrix-js-sdk/src/models/event";
import { RoomMember } from "matrix-js-sdk/src/models/room-member";
import { logger } from "matrix-js-sdk/src/logger";

import MemberAvatar from "../avatars/MemberAvatar";
import { _t } from "../../../languageHandler";
import { useStateToggle } from "../../../hooks/useStateToggle";
import AccessibleButton from "./AccessibleButton";
import { Layout } from "../../../settings/enums/Layout";

interface IProps {
    // An array of member events to summarise
    "events": MatrixEvent[];
    // The minimum number of events needed to trigger summarisation
    "threshold"?: number;
    // Whether or not to begin with state.expanded=true
    "startExpanded"?: boolean;
    // The list of room members for which to show avatars next to the summary
    "summaryMembers"?: RoomMember[];
    // The text to show as the summary of this event list
    "summaryText"?: ReactNode;
    // An array of EventTiles to render when expanded
    "children": ReactNode[] | null;
    // Called when the event list expansion is toggled
    onToggle?(): void;
    // The layout currently used
    "layout"?: Layout;
    "data-testid"?: string;
}

const GenericEventListSummary: React.FC<IProps> = ({
    events,
    children,
    threshold = 3,
    onToggle,
    startExpanded = false,
    summaryMembers = [],
    summaryText,
    layout = Layout.Group,
    "data-testid": testId,
}) => {
    const [expanded, toggleExpanded] = useStateToggle(startExpanded);

    // Whenever expanded changes call onToggle
    useEffect(() => {
        if (onToggle) {
            onToggle();
        }
    }, [expanded]); // eslint-disable-line react-hooks/exhaustive-deps

    const eventIds = events.map((e) => e.getId()).join(",");

    // If we are only given few events then just pass them through
    if (events.length < threshold) {
        return (
            <li
                className="mx_GenericEventListSummary"
                data-scroll-tokens={eventIds}
                data-expanded={true}
                data-layout={layout}
            >
                <ol className="mx_GenericEventListSummary_unstyledList">{children}</ol>
            </li>
        );
    }

    let body;
    if (expanded) {
        body = (
            <React.Fragment>
                <div className="mx_GenericEventListSummary_spacer">&nbsp;</div>
                <ol className="mx_GenericEventListSummary_unstyledList">{children}</ol>
            </React.Fragment>
        );
    } else {
        const uniqueMembers = uniqBy(
            summaryMembers.filter((member) => {
                if (!member?.getMxcAvatarUrl) {
                    logger.error(
                        "EventListSummary given null summaryMember, termites may be afoot eating event senders",
                        summaryMembers,
                    );
                    return false;
                }
                return true;
            }),
            (member) => member.getMxcAvatarUrl(),
        );
        const avatars = uniqueMembers.map((m) => <MemberAvatar key={m.userId} member={m} width={14} height={14} />);
        body = (
            <div className="mx_EventTile_line">
                <div className="mx_EventTile_info">
                    <span className="mx_GenericEventListSummary_avatars" onClick={toggleExpanded}>
                        {avatars}
                    </span>
                    <span className="mx_TextualEvent mx_GenericEventListSummary_summary">{summaryText}</span>
                </div>
            </div>
        );
    }

    return (
        <li
            className="mx_GenericEventListSummary"
            data-scroll-tokens={eventIds}
            data-expanded={expanded + ""}
            data-layout={layout}
            data-testid={testId}
        >
            <AccessibleButton
                kind="link_inline"
                className="mx_GenericEventListSummary_toggle"
                onClick={toggleExpanded}
                aria-expanded={expanded}
            >
                {expanded ? _t("collapse") : _t("expand")}
            </AccessibleButton>
            {body}
        </li>
    );
};

export default GenericEventListSummary;