/*
 * Acces Levels:
 * * -1 - banned
 * * 0 - user
 * * 1 - moderator
 * * 2 - editor
 * * 3 - admin
 * * 4 - superadmin
 * * 5 - root
 */

const ACCESS_LEVELS = {
	"-1": "banned",
	0: "user",
	1: "helper",
	2: "moderator",
	3: "admin",
	4: "superadmin",
	5: "root",
};

class AccessLevel {
	static validate (value) {
		const access = Object.fromEntries(Object.keys(ACCESS_LEVELS)
			.map(level => [level, true]));
		return (
			Number.isInteger(value) &&
			access["" + value] === true
		);
	}
	
	constructor (accessLevel) {
		if (!this.__proto__.constructor.validate(accessLevel))
			throw new Error(
				`Invalid access level: ${accessLevel}`,
			);
		this.code = accessLevel;
	}
	
	get accessName () {
		return ACCESS_LEVELS[""+this.code]
	}
}

class User {
	constructor (name, accessLevel) {
		this.name = name;
		if (accessLevel instanceof AccessLevel)
			this.accessLevel = accessLevel;
		else
			this.accessLevel = new AccessLevel(accessLevel);
	}

	static async getUserByName(name) {
		if (User.cache[name]) return User.cache[name];
		if (
			!!global.config.rootuser?.activated &&
			name === global.config.rootuser.login
		) {
			const user = new User(name, 5);
			User.cache[name] = user;
			return user;
		}
		// TODO: Потом добавить чтение из БД
		//return null;
		
		const userdata = await global.database.getUserRowByName(name);
		if (!userdata)
			return null;
		const user = new User(userdata.username, userdata.accessLevel);
		User.cache[name] = user;
		return user;
	}

	static getByToken(token) {
		const user = global.authed.tokens[token];
		return user ?? null;
	}

	getUserForAPI(getFullInfo = false, fields = "*") {
		const getted = {
			username: this.name,
			accessLevel: this.accessLevel.code,
		};
		
		if (fields !== "*") {
			const selected = Object.fromEntries(fields.split(/\s*,\s*/g).map(field => [field, true]));
			for (let field in getted) {
				if (!selected[field])
					getted[field] = undefined;
			}
		}
		
		return getted;
	}
	
	async getCharacters () {
		return [];
	}
}
User.cache = {};

module.exports = { User, AccessLevel };