/* eslint-disable react-hooks/rules-of-hooks */
import { observer } from "mobx-react-lite";
import { useParams } from "react-router-dom";
import { Role } from "revolt-api/types/Servers";
import { Presence } from "revolt-api/types/Users";
import { Channel } from "revolt.js/dist/maps/Channels";
import { Server } from "revolt.js/dist/maps/Servers";
import { User } from "revolt.js/dist/maps/Users";

import { useContext, useEffect, useState } from "preact/hooks";

import { defer } from "../../../lib/defer";

import {
    ClientStatus,
    StatusContext,
    useClient,
} from "../../../context/revoltjs/RevoltClient";

import { GenericSidebarBase } from "../SidebarBase";
import MemberList, { MemberListGroup } from "./MemberList";

/*export const Container = styled.div`
    padding-top: 48px;

    ${isTouchscreenDevice &&
    css`
        padding-top: 0;
    `}
`;*/

export default function MemberSidebar() {
    const channel = useClient().channels.get(
        useParams<{ channel: string }>().channel,
    );

    switch (channel?.channel_type) {
        case "Group":
            return <GroupMemberSidebar channel={channel} />;
        case "TextChannel":
            return <ServerMemberSidebar channel={channel} />;
        default:
            return null;
    }
}

function useEntries(channel: Channel, keys: string[], isServer?: boolean) {
    const client = channel.client;
    const [entries, setEntries] = useState<MemberListGroup[]>([]);

    useEffect(() => {
        defer(() => {
            const categories: { [key: string]: [User, string][] } = {
                online: [],
                offline: [],
            };

            const categoryInfo: { [key: string]: string } = {};

            let roles: Server["roles"] | undefined;
            let roleList: string[];
            if (
                channel.channel_type === "TextChannel" ||
                channel.channel_type === "VoiceChannel"
            ) {
                roles = channel.server?.roles;
                if (roles) {
                    const list = Object.keys(roles)
                        .map((id) => {
                            return [id, roles![id], roles![id].rank ?? 0] as [
                                string,
                                Role,
                                number,
                            ];
                        })
                        .filter(([, role]) => role.hoist);

                    list.sort((b, a) => b[2] - a[2]);

                    list.forEach(([id, role]) => {
                        if (categories[id]) return;
                        categories[id] = [];
                        categoryInfo[id] = role.name;
                    });

                    roleList = list.map((x) => x[0]);
                }
            }

            keys.forEach((key) => {
                let u;
                if (isServer) {
                    const { server, user } = JSON.parse(key);
                    if (server !== channel.server_id) return;
                    u = client.users.get(user);
                } else {
                    u = client.users.get(key);
                }

                if (!u) return;

                const member = client.members.get(key);
                const sort = member?.nickname ?? u.username;
                const entry = [u, sort] as [User, string];

                if (!u.online || u.status?.presence === Presence.Invisible) {
                    categories.offline.push(entry);
                } else {
                    if (isServer) {
                        // Sort users into hoisted roles here.
                        if (member?.roles && roles) {
                            let success = false;
                            for (const role of roleList) {
                                if (member.roles.includes(role)) {
                                    categories[role].push(entry);
                                    success = true;
                                    break;
                                }
                            }

                            if (success) return;
                        }
                    } else {
                        // Sort users into "participants" list here.
                        // For voice calls.
                    }

                    categories.online.push(entry);
                }
            });

            Object.keys(categories).forEach((key) =>
                categories[key].sort((a, b) => a[1].localeCompare(b[1])),
            );

            const entries: MemberListGroup[] = [];

            Object.keys(categoryInfo).forEach((key) => {
                if (categories[key].length > 0) {
                    entries.push({
                        type: "role",
                        name: categoryInfo[key],
                        users: categories[key].map((x) => x[0]),
                    });
                }
            });

            if (categories.online.length > 0) {
                entries.push({
                    type: "online",
                    users: categories.online.map((x) => x[0]),
                });
            }

            if (categories.offline.length > 0) {
                entries.push({
                    type: "offline",
                    users: categories.offline.map((x) => x[0]),
                });
            }

            setEntries(entries);
        });
        // eslint-disable-next-line
    }, [keys]);

    return entries;
}

export const GroupMemberSidebar = observer(
    ({ channel }: { channel: Channel }) => {
        const keys = [...channel.recipient_ids!];
        const entries = useEntries(channel, keys);

        return (
            <GenericSidebarBase data-scroll-offset="with-padding">
                {/*<Container>
                    {isTouchscreenDevice && <div>Group settings go here</div>}
                </Container>*/}

                <MemberList entries={entries} context={channel} />
            </GenericSidebarBase>
        );
    },
);

// ! FIXME: this is temporary code until we get lazy guilds like subscriptions
const FETCHED: Set<String> = new Set();

export function resetMemberSidebarFetched() {
    FETCHED.clear();
}

export const ServerMemberSidebar = observer(
    ({ channel }: { channel: Channel }) => {
        const client = useClient();
        const status = useContext(StatusContext);

        useEffect(() => {
            const server_id = channel.server_id!;
            if (status === ClientStatus.ONLINE && !FETCHED.has(server_id)) {
                channel
                    .server!.fetchMembers()
                    .then(() => FETCHED.add(server_id));
            }
            // eslint-disable-next-line
        }, [status, channel.server_id]);

        const keys = [...client.members.keys()];
        const entries = useEntries(channel, keys, true);

        return (
            <GenericSidebarBase data-scroll-offset="with-padding">
                {/*<Container>
                    {isTouchscreenDevice && <div>Server settings go here</div>}
                </Container>*/}
                <MemberList entries={entries} context={channel} />
            </GenericSidebarBase>
        );
    },
);
