const { Structures } = require('discord.js');

const User = Structures.extend('User', (User) => {

    class ExtendedUser extends User {

        constructor(...args) {

            super(...args);
            
            this._settings = null; //internal cache of current users' settings; should ALWAYS stay the same as database.
            this._cached = Date.now();

            this._points = {};

        }

        async settings() {
            if (!this._settings) this._settings = this.client.storageManager.mongodb.users.findOne({ userId: this.id });
            if (this._settings instanceof Promise) this._settings = await this._settings || {};
            if(!this._settings) this._settings = { userId: this.id, ...this.defaultConfig };
            else this._settings = { ...this.defaultConfig, ...this._settings };
            return this._settings;
        }
        
        async totalPoints(guild, point) { // point = { points: x, expiration: x, timestamp: x}
            let index = this._points[guild.id];
            if(!index) {
                this._points[guild.id] = {
                    expirations: [],
                    points: null
                };
                index = this._points[guild.id];
            }

            if(index.points === null) {
                const find = await this.client.storageManager.mongodb.infractions.find(
                    { guild: guild.id, target: this.id, resolved: false, points: { $gt: 0 }, $or: [ { expiration: 0 }, { expiration: { $gte: Date.now() } }] },
                    { projection: { points: "$points", expiration: "$expiration", timestamp: "$timestamp" } }
                );
                index.points = 0;
                if(find && find.length > 0) {
                    for(const { points, expiration, timestamp } of find) {
                        if(expiration > 0) {
                            index.expirations.push({ points, expiration: expiration*1000+timestamp });
                        } else {
                            index.points += points;
                        }
                    }
                }
            }

            if(point) {
                if(point.expiration > 0) {
                    index.expirations.push({ points: point.points, expiration: point.expiration*1000+point.timestamp });
                } else {
                    index.points += point.points;
                }
            }

            let expirationPoints = index.expirations.map((e) => {
                if(e.expiration >= Date.now()) return e.points;
                return 0;
            });

            if(expirationPoints.length === 0) expirationPoints = [0];
            return expirationPoints.reduce((p, v) => p+v) + index.points;

        }

        /* Settings Wrapper */
        
        async _updateSettings(data) { //Update property (upsert true) - updateOne
            if(!this._settings) await this.settings();
            try {
                await this.client.storageManager.mongodb.users.updateOne(
                    { guildId: this.id },
                    data
                );
                this._settings = { 
                    ...this._settings,
                    ...data
                };
                this._storageLog(`Database Update (guild:${this.id}).`);
            } catch(error) {
                this._storageError(error);
            }
            return true;
        }

        /* Logging */

        _storageLog(log) {
            this.client.logger.debug(log);
        }

        _storageError(error) {
            this.client.logger.error(`Database Error (user:${this.id}) : \n${error.stack || error}`);
        }

        /* Lazy Getters */

        get defaultConfig() {
            return JSON.parse(JSON.stringify(this.client.defaultConfig('USER')));
        }

        get developer() {
            return this.client._options.bot.owners.includes(this.id);
        }

        get timeSinceCached() {
            return Date.now()-this._cached;
        }

        get prefix() {
            return this.client._options.bot.prefix;
        }

        get display() {
            return this.tag;
        }

        get mention() {
            return `<@${this.id}>`;
        }

    }

    return ExtendedUser;

});

module.exports = User;