import { Member } from "revolt.js/dist/maps/Members";
import { User } from "revolt.js/dist/maps/Users";
import { client } from "..";
import ServerConfig from "../struct/ServerConfig";

let ServerPermissions = {
    ['View' as string]: 1 << 0,
    ['ManageRoles' as string]: 1 << 1,
    ['ManageChannels' as string]: 1 << 2,
    ['ManageServer' as string]: 1 << 3,
    ['KickMembers' as string]: 1 << 4,
    ['BanMembers' as string]: 1 << 5,
    ['ChangeNickname' as string]: 1 << 12,
    ['ManageNicknames' as string]: 1 << 13,
    ['ChangeAvatar' as string]: 1 << 14,
    ['RemoveAvatars' as string]: 1 << 15,
}

const NO_MANAGER_MSG = '🔒 Missing permission';
const USER_MENTION_REGEX = /^<@[0-9A-HJ-KM-NP-TV-Z]{26}>$/i;
const CHANNEL_MENTION_REGEX = /^<#[0-9A-HJ-KM-NP-TV-Z]{26}>$/i;

/**
 * Parses user input and returns an user object.
 * Supports: `userID`, `<@userID>` (mention), `username`, `@username` (if user is cached).
 * @param text
 * @returns null if not found, otherwise user object
 */
async function parseUser(text: string): Promise<User|null> {
    if (!text) return null;

    let uid: string|null = null;
    if (USER_MENTION_REGEX.test(text)) {
        uid = text.replace(/<@|>/g, '').toUpperCase();
    } else if (/^[0-9A-HJ-KM-NP-TV-Z]{26}$/gi.test(text)) {
        uid = text.toUpperCase();
    } else {
        if (text.startsWith('@')) text = text.substr(1);

        // Why is there no .find() or .filter()
        let user: User|null = null;
        client.users.forEach(u => {
            if (u.username?.toLowerCase() == text.toLowerCase()) {
                user = u;
            }
        });

        if (user) return user;
    }

    if (uid) return await client.users.fetch(uid) || null;
    else return null;
}

async function isBotManager(member: Member) {
    return hasPerm(member, 'ManageServer')
        || (((await client.db.get('servers').findOne({ id: member.server?._id }) || {}) as ServerConfig)
        .botManagers?.indexOf(member.user?._id!) ?? -1) > -1;
}

function hasPerm(member: Member, perm:  'View'|'ManageRoles'|'ManageChannels'|'ManageServer'|  // its late and im tired
                                        'KickMembers'|'BanMembers'|'ChangeNickname'|           // dont judge my code
                                        'ManageNicknames'|'ChangeAvatar'|'RemoveAvatars'): boolean {
    let p = ServerPermissions[perm];
    if (member.server?.owner == member.user?._id) return true;

    // this should work but im not 100% certain
    let userPerm = member.roles?.map(id => member.server?.roles?.[id])
        .reduce((sum: number, cur: any) => sum | cur.permissions[0], member.server?.default_permissions[0]) ?? 0;
    
    return !!(userPerm & p);
}

export {
    hasPerm,
    isBotManager,
    parseUser,
    NO_MANAGER_MSG,
    USER_MENTION_REGEX,
    CHANNEL_MENTION_REGEX
}