const { Structures, WebhookClient } = require('discord.js');
const { Collection } = require('../../util');

const safeCommands = ['command:settings', 'command:grant', 'command:revoke'];

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

    class ExtendedGuild extends Guild {

        constructor(...args) {

            super(...args);

            this._settings = null; //internal cache of current guild's settings; should ALWAYS stay the same as database.
            this._permissions = null; //internal cache, should always match database.

            this.callbacks = [];
            this.webhooks = new Collection();

        }

        //Fetch and cache settings
        async settings() {
            if(!this._settings) this._settings = this.client.storageManager.mongodb.guilds.findOne({ guildId: this.id });
            if(this._settings instanceof Promise) this._settings = await this._settings || null;
            if(!this._settings) this._settings = { guildId: this.id, ...this.defaultConfig };
            // else this._settings = Object.assign({}, { ...this.defaultConfig, ...this._settings }); //eslint-disable-line prefer-object-spread
            else this._settings = { ...this.defaultConfig, ...this._settings }; //eslint-disable-line prefer-object-spread
            return this._settings;
        }

        //Fetch and cache perms
        async permissions() {
            if(!this._permissions) this._permissions = this.client.storageManager.mongodb.permissions.findOne({ guildId: this.id });
            if(this._permissions instanceof Promise) this._permissions = await this._permissions || null;
            if(!this._permissions) this._permissions = { guildId: this.id };
            return this._permissions;
        }

        async caseId() {
            if(!this._settings) await this.settings();
            return this._caseId = this._settings.caseId; //eslint-disable-line no-return-assign
        }

        /**
         * Update a webhook entry in the database
         *
         * @param {string} feature Which feature webhook to update, e.g. messagelog
         * @param {Webhook} hook The webhook object, omitting this will nullify the hook data
         * @memberof ExtendedGuild
         */
        async updateWebhook(feature, hook) {

            if (!feature) return false;

            if (!hook) {
                this.client.logger.debug(`Removing webhook in ${this.name} (${this.id})`);
                const hook = this.webhooks.get(feature);
                if (hook) await hook.delete('Removing old webhook').catch((err) => {
                    if(err.code !== 10015) this.client.logger.error(err.stack);
                });
                this.webhooks.delete(feature);
                return this.client.storage.mongodb.webhooks.deleteOne({ feature, guild: this.id });
            } 

            this.webhooks.set(feature, hook);
            return this.client.storage.mongodb.webhooks.updateOne({ feature, guild: this.id }, { hookID: hook.id, token: hook.token });

        }

        /**
         * Retrieves a cached webhook for a feature if it exists, gets it from the database if not cached
         *
         * @param {string} feature The name of the feature, ex. messageLogs
         * @returns {Webhook}
         * @memberof ExtendedGuild
         */
        async getWebhook(feature) {

            if (!feature) return false;
            if (this.webhooks.has(feature)) return this.webhooks.get(feature);

            const result = await this.client.storage.mongodb.webhooks.findOne({ feature, guild: this.id });
            if (!result) return false;
            const hooks = await this.fetchWebhooks();
            const hook = hooks.get(result.hookID);
            if (!hook) return false;
            // const hook = new WebhookClient(result.hookID, result.token, {
            //     disableMentions: 'everyone'
            // });
            this.webhooks.set(feature, hook);
            return hook;

        }

        /* Settings Wrapper */

        async _deleteSettings() { //Delete whole entry - remove
            try {
                await this.client.storageManager.guilds.deleteOne({ guildId: this.id });
                this._settings = { ...{}, ...this.defaultConfig }; //Create a new object so settings that change the _settings value won't replicate it towards the defaultConfig.
                this._storageLog(`Database Delete (guild:${this.id}).`);
            } catch(error) {
                this._storageError(error);
            }
            return true;
        }

        async _resetSettings() {
            if(!this._settings) await this.settings();
            try {
                await this.client.storageManager.mongodb.guilds.updateOne(
                    { guildId: this.id },
                    { caseId: this._settings.caseId, guildId: this.id },
                    false //No upsert
                );
                this._settings = { 
                    ...this.defaultConfig,
                    ...{ caseId: this._settings.caseId }
                };
                this._storageLog(`Database Reset (guild:${this.id}).`);
            } catch(error) {
                this._storageError(error);
            }
        }

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

        async _removeSettings(value) { //Remove property
            if(!this._settings) await this.settings();
            if(this.defaultConfig[value]) {
                await this._updateSettings({ [value]: this.defaultConfig[value] });
                return undefined;
            }
            try {
                await this.client.storageManager.mongodb.guilds.removeProperty(
                    { guildId: this.id },
                    [ value ]
                );
                this._storageLog(`Database Remove (guild:${this.id}).`);
                delete this._settings[value];
            } catch(error) {
                this._storageError(error);
            }
            return true;
        }

        /* Language Formatting */

        format(index, parameters = {}, code = false) {

            let language = 'en_us';
            if (this._settings.locale) language = this._settings.locale;

            parameters.prefix = this.prefix;
            return this.client.format(language, index, parameters, code);

        }

        /* Resolver Shortcuts */

        async resolveMembers(members, strict) {

            return this.client.resolver.resolveMembers(members, strict, this);

        }

        async resolveMember(member, strict) {

            return this.client.resolver.resolveMembers(member, strict, this);

        }

        async resolveChannels(channels, strict) {

            return this.client.resolver.resolveChannels(channels, strict, this);

        }

        async resolveChannel(channel, strict) {

            return this.client.resolver.resolveChannel(channel, strict, this);

        }

        async resolveRoles(roles, strict) {

            return this.client.resolver.resolveRoles(roles, strict, this);

        }

        async resolveRole(role, strict) {
            
            return this.client.resolver.resolveRole(role, strict, this);

        }


        /* Logging */

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

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

        _debugLog(log) {
            this.client.logger.debug(`[${this.name}](${this.id}): ${log}`);
        }

        /* Lazy Developer Getters */

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

        get prefix() {
            return this._settings.prefix
                || this.client._options.bot.prefix;
        }
        
        get premium() { //GUILD SETTINGS MUST BE FETCHED
            return this._settings.premium; 
        }

        get debug() { //GUILD SETTINGS MUST BE FETCHED
            return this._settings.debug;
        }

    }

    return ExtendedGuild;

});

module.exports = Guild;