const Invite = require('./Invite');
const GuildAuditLogs = require('./GuildAuditLogs');
const Webhook = require('./Webhook');
const VoiceRegion = require('./VoiceRegion');
const { ChannelTypes, Events, browser } = require('../util/Constants');
const Collection = require('../util/Collection');
const Util = require('../util/Util');
const DataResolver = require('../util/DataResolver');
const Snowflake = require('../util/Snowflake');
const Shared = require('./shared');
const GuildMemberStore = require('../stores/GuildMemberStore');
const RoleStore = require('../stores/RoleStore');
const GuildEmojiStore = require('../stores/GuildEmojiStore');
const GuildChannelStore = require('../stores/GuildChannelStore');
const PresenceStore = require('../stores/PresenceStore');
const Base = require('./Base');
const { Error, TypeError } = require('../errors');

/**
 * Represents a guild (or a server) on Discord.
 * <info>It's recommended to see if a guild is available before performing operations or reading data from it. You can
 * check this with `guild.available`.</info>
 * @extends {Base}
 */
class Guild extends Base {
  constructor(client, data) {
    super(client);

    /**
     * A collection of members that are in this guild. The key is the member's ID, the value is the member
     * @type {GuildMemberStore<Snowflake, GuildMember>}
     */
    this.members = new GuildMemberStore(this);

    /**
     * A collection of channels that are in this guild. The key is the channel's ID, the value is the channel
     * @type {GuildChannelStore<Snowflake, GuildChannel>}
     */
    this.channels = new GuildChannelStore(this);

    /**
     * A collection of roles that are in this guild. The key is the role's ID, the value is the role
     * @type {RoleStore<Snowflake, Role>}
     */
    this.roles = new RoleStore(this);

    /**
     * A collection of presences in this guild
     * @type {PresenceStore<Snowflake, Presence>}
     */
    this.presences = new PresenceStore(this.client);

    /**
     * Whether the bot has been removed from the guild
     * @type {boolean}
     */
    this.deleted = false;

    if (!data) return;
    if (data.unavailable) {
      /**
       * Whether the guild is available to access. If it is not available, it indicates a server outage
       * @type {boolean}
       */
      this.available = false;

      /**
       * The Unique ID of the guild, useful for comparisons
       * @type {Snowflake}
       */
      this.id = data.id;
    } else {
      this._patch(data);
      if (!data.channels) this.available = false;
    }
  }

  /* eslint-disable complexity */
  /**
   * Sets up the guild.
   * @param {*} data The raw data of the guild
   * @private
   */
  _patch(data) {
    /**
     * The name of the guild
     * @type {string}
     */
    this.name = data.name;

    /**
     * The hash of the guild icon
     * @type {?string}
     */
    this.icon = data.icon;

    /**
     * The hash of the guild splash image (VIP only)
     * @type {?string}
     */
    this.splash = data.splash;

    /**
     * The region the guild is located in
     * @type {string}
     */
    this.region = data.region;

    /**
     * The full amount of members in this guild as of `READY`
     * @type {number}
     */
    this.memberCount = data.member_count || this.memberCount;

    /**
     * Whether the guild is "large" (has more than 250 members)
     * @type {boolean}
     */
    this.large = Boolean('large' in data ? data.large : this.large);

    /**
     * An array of enabled guild features, here are the possible values:
     * * INVITE_SPLASH
     * * MORE_EMOJI
     * * VERIFIED
     * * VIP_REGIONS
     * * VANITY_URL
     * @typedef {string} Features
     */

    /**
     * An array of guild features partnered guilds have enabled
     * @type {Features[]}
     */
    this.features = data.features;

    /**
     * The ID of the application that created this guild (if applicable)
     * @type {?Snowflake}
     */
    this.applicationID = data.application_id;

    /**
     * The time in seconds before a user is counted as "away from keyboard"
     * @type {?number}
     */
    this.afkTimeout = data.afk_timeout;

    /**
     * The ID of the voice channel where AFK members are moved
     * @type {?Snowflake}
     */
    this.afkChannelID = data.afk_channel_id;

    /**
     * The ID of the system channel
     * @type {?Snowflake}
     */
    this.systemChannelID = data.system_channel_id;

    /**
     * Whether embedded images are enabled on this guild
     * @type {boolean}
     */
    this.embedEnabled = data.embed_enabled;

    /**
     * The verification level of the guild
     * @type {number}
     */
    this.verificationLevel = data.verification_level;

    /**
     * The explicit content filter level of the guild
     * @type {number}
     */
    this.explicitContentFilter = data.explicit_content_filter;

    /**
     * The required MFA level for the guild
     * @type {number}
     */
    this.mfaLevel = data.mfa_level;

    /**
     * The timestamp the client user joined the guild at
     * @type {number}
     */
    this.joinedTimestamp = data.joined_at ? new Date(data.joined_at).getTime() : this.joinedTimestamp;

    this.id = data.id;
    this.available = !data.unavailable;
    this.features = data.features || this.features || [];

    if (data.channels) {
      this.channels.clear();
      for (const rawChannel of data.channels) {
        this.client.channels.add(rawChannel, this);
      }
    }

    if (data.roles) {
      this.roles.clear();
      for (const role of data.roles) this.roles.add(role);
    }

    if (data.members) {
      this.members.clear();
      for (const guildUser of data.members) this.members.add(guildUser);
    }

    if (data.owner_id) {
      /**
       * The user ID of this guild's owner
       * @type {Snowflake}
       */
      this.ownerID = data.owner_id;
    }

    if (data.presences) {
      for (const presence of data.presences) {
        this.presences.add(presence);
      }
    }

    if (!this.voiceStates) this.voiceStates = new VoiceStateCollection(this);
    if (data.voice_states) {
      for (const voiceState of data.voice_states) this.voiceStates.set(voiceState.user_id, voiceState);
    }

    if (!this.emojis) {
      /**
       * A collection of emojis that are in this guild. The key is the emoji's ID, the value is the emoji.
       * @type {GuildEmojiStore<Snowflake, GuildEmoji>}
       */
      this.emojis = new GuildEmojiStore(this);
      if (data.emojis) for (const emoji of data.emojis) this.emojis.add(emoji);
    } else {
      this.client.actions.GuildEmojisUpdate.handle({
        guild_id: this.id,
        emojis: data.emojis,
      });
    }
  }

  /**
   * The timestamp the guild was created at
   * @type {number}
   * @readonly
   */
  get createdTimestamp() {
    return Snowflake.deconstruct(this.id).timestamp;
  }

  /**
   * The time the guild was created at
   * @type {Date}
   * @readonly
   */
  get createdAt() {
    return new Date(this.createdTimestamp);
  }

  /**
   * The time the client user joined the guild
   * @type {Date}
   * @readonly
   */
  get joinedAt() {
    return new Date(this.joinedTimestamp);
  }

  /**
   * If this guild is verified
   * @type {boolean}
   * @readonly
   */
  get verified() {
    return this.features.includes('VERIFIED');
  }

  /**
   * The URL to this guild's icon.
   * @param {Object} [options={}] Options for the icon url
   * @param {string} [options.format='webp'] One of `webp`, `png`, `jpg`
   * @param {number} [options.size=128] One of `128`, `256`, `512`, `1024`, `2048`
   * @returns {?string}
   */
  iconURL({ format, size } = {}) {
    if (!this.icon) return null;
    return this.client.rest.cdn.Icon(this.id, this.icon, format, size);
  }

  /**
   * The acronym that shows up in place of a guild icon.
   * @type {string}
   * @readonly
   */
  get nameAcronym() {
    return this.name.replace(/\w+/g, name => name[0]).replace(/\s/g, '');
  }

  /**
   * The URL to this guild's splash.
   * @param {Object} [options={}] Options for the splash url
   * @param {string} [options.format='webp'] One of `webp`, `png`, `jpg`
   * @param {number} [options.size=128] One of `128`, `256`, `512`, `1024`, `2048`
   * @returns {?string}
   */
  splashURL({ format, size } = {}) {
    if (!this.splash) return null;
    return this.client.rest.cdn.Splash(this.id, this.splash, format, size);
  }

  /**
   * The owner of the guild
   * @type {?GuildMember}
   * @readonly
   */
  get owner() {
    return this.members.get(this.ownerID) || null;
  }

  /**
   * AFK voice channel for this guild
   * @type {?VoiceChannel}
   * @readonly
   */
  get afkChannel() {
    return this.client.channels.get(this.afkChannelID) || null;
  }

  /**
   * System channel for this guild
   * @type {?TextChannel}
   * @readonly
   */
  get systemChannel() {
    return this.client.channels.get(this.systemChannelID) || null;
  }

  /**
   * If the client is connected to any voice channel in this guild, this will be the relevant VoiceConnection
   * @type {?VoiceConnection}
   * @readonly
   */
  get voiceConnection() {
    if (browser) return null;
    return this.client.voice.connections.get(this.id) || null;
  }

  /**
   * The position of this guild
   * <warn>This is only available when using a user account.</warn>
   * @type {?number}
   * @readonly
   */
  get position() {
    if (this.client.user.bot) return null;
    if (!this.client.user.settings.guildPositions) return null;
    return this.client.user.settings.guildPositions.indexOf(this.id);
  }

  /**
   * Whether the guild is muted
   * <warn>This is only available when using a user account.</warn>
   * @type {?boolean}
   * @readonly
   */
  get muted() {
    if (this.client.user.bot) return null;
    try {
      return this.client.user.guildSettings.get(this.id).muted;
    } catch (err) {
      return false;
    }
  }

  /**
   * The type of message that should notify you
   * one of `EVERYTHING`, `MENTIONS`, `NOTHING`
   * <warn>This is only available when using a user account.</warn>
   * @type {?string}
   * @readonly
   */
  get messageNotifications() {
    if (this.client.user.bot) return null;
    try {
      return this.client.user.guildSettings.get(this.id).messageNotifications;
    } catch (err) {
      return null;
    }
  }

  /**
   * Whether to receive mobile push notifications
   * <warn>This is only available when using a user account.</warn>
   * @type {?boolean}
   * @readonly
   */
  get mobilePush() {
    if (this.client.user.bot) return null;
    try {
      return this.client.user.guildSettings.get(this.id).mobilePush;
    } catch (err) {
      return false;
    }
  }

  /**
   * Whether to suppress everyone messages
   * <warn>This is only available when using a user account.</warn>
   * @type {?boolean}
   * @readonly
   */
  get suppressEveryone() {
    if (this.client.user.bot) return null;
    try {
      return this.client.user.guildSettings.get(this.id).suppressEveryone;
    } catch (err) {
      return null;
    }
  }

  /**
   * The `@everyone` role of the guild
   * @type {?Role}
   * @readonly
   */
  get defaultRole() {
    return this.roles.get(this.id) || null;
  }

  /**
   * The client user as a GuildMember of this guild
   * @type {?GuildMember}
   * @readonly
   */
  get me() {
    return this.members.get(this.client.user.id) || null;
  }

  /**
   * Returns the GuildMember form of a User object, if the user is present in the guild.
   * @param {UserResolvable} user The user that you want to obtain the GuildMember of
   * @returns {?GuildMember}
   * @example
   * // Get the guild member of a user
   * const member = guild.member(message.author);
   */
  member(user) {
    return this.members.resolve(user);
  }

  /**
   * An object containing information about a guild member's ban.
   * @typedef {Object} BanInfo
   * @property {User} user User that was banned
   * @property {?string} reason Reason the user was banned
   */

  /**
   * Fetches a collection of banned users in this guild.
   * @returns {Promise<Collection<Snowflake, BanInfo>>}
   */
  fetchBans() {
    return this.client.api.guilds(this.id).bans.get().then(bans =>
      bans.reduce((collection, ban) => {
        collection.set(ban.user.id, {
          reason: ban.reason,
          user: this.client.users.add(ban.user),
        });
        return collection;
      }, new Collection())
    );
  }

  /**
   * Fetches a collection of invites to this guild.
   * Resolves with a collection mapping invites by their codes.
   * @returns {Promise<Collection<string, Invite>>}
   * @example
   * // Fetch invites
   * guild.fetchInvites()
   *   .then(invites => console.log(`Fetched ${invites.size} invites`))
   *   .catch(console.error);
   * @example
   * // Fetch invite creator by their id
   * guild.fetchInvites()
   *  .then(invites => console.log(invites.find(invite => invite.inviter.id === '84484653687267328')))
   *  .catch(console.error);
   */
  fetchInvites() {
    return this.client.api.guilds(this.id).invites.get()
      .then(inviteItems => {
        const invites = new Collection();
        for (const inviteItem of inviteItems) {
          const invite = new Invite(this.client, inviteItem);
          invites.set(invite.code, invite);
        }
        return invites;
      });
  }

  /**
   * Fetches all webhooks for the guild.
   * @returns {Promise<Collection<Snowflake, Webhook>>}
   * @example
   * // Fetch webhooks
   * guild.fetchWebhooks()
   *   .then(webhooks => console.log(`Fetched ${webhooks.size} webhooks`))
   *   .catch(console.error);
   */
  fetchWebhooks() {
    return this.client.api.guilds(this.id).webhooks.get().then(data => {
      const hooks = new Collection();
      for (const hook of data) hooks.set(hook.id, new Webhook(this.client, hook));
      return hooks;
    });
  }

  /**
   * Fetches available voice regions.
   * @returns {Promise<Collection<string, VoiceRegion>>}
   */
  fetchVoiceRegions() {
    return this.client.api.guilds(this.id).regions.get().then(res => {
      const regions = new Collection();
      for (const region of res) regions.set(region.id, new VoiceRegion(region));
      return regions;
    });
  }

  /**
   * Fetches audit logs for this guild.
   * @param {Object} [options={}] Options for fetching audit logs
   * @param {Snowflake|GuildAuditLogsEntry} [options.before] Limit to entries from before specified entry
   * @param {Snowflake|GuildAuditLogsEntry} [options.after] Limit to entries from after specified entry
   * @param {number} [options.limit] Limit number of entries
   * @param {UserResolvable} [options.user] Only show entries involving this user
   * @param {AuditLogAction|number} [options.type] Only show entries involving this action type
   * @returns {Promise<GuildAuditLogs>}
   * @example
   * // Output audit log entries
   * guild.fetchAuditLogs()
   *   .then(audit => console.log(audit.entries.first()))
   *   .catch(console.error);
   */
  fetchAuditLogs(options = {}) {
    if (options.before && options.before instanceof GuildAuditLogs.Entry) options.before = options.before.id;
    if (options.after && options.after instanceof GuildAuditLogs.Entry) options.after = options.after.id;
    if (typeof options.type === 'string') options.type = GuildAuditLogs.Actions[options.type];

    return this.client.api.guilds(this.id)['audit-logs'].get({ query: {
      before: options.before,
      after: options.after,
      limit: options.limit,
      user_id: this.client.users.resolveID(options.user),
      action_type: options.type,
    } })
      .then(data => GuildAuditLogs.build(this, data));
  }

  /**
   * Adds a user to the guild using OAuth2. Requires the `CREATE_INSTANT_INVITE` permission.
   * @param {UserResolvable} user User to add to the guild
   * @param {Object} options Options for the addition
   * @param {string} options.accessToken An OAuth2 access token for the user with the `guilds.join` scope granted to the
   * bot's application
   * @param {string} [options.nick] Nickname to give the member (requires `MANAGE_NICKNAMES`)
   * @param {Collection<Snowflake, Role>|RoleResolvable[]} [options.roles] Roles to add to the member
   * (requires `MANAGE_ROLES`)
   * @param {boolean} [options.mute] Whether the member should be muted (requires `MUTE_MEMBERS`)
   * @param {boolean} [options.deaf] Whether the member should be deafened (requires `DEAFEN_MEMBERS`)
   * @returns {Promise<GuildMember>}
   */
  addMember(user, options) {
    user = this.client.users.resolveID(user);
    if (!user) return Promise.reject(new TypeError('INVALID_TYPE', 'user', 'UserResolvable'));
    if (this.members.has(user)) return Promise.resolve(this.members.get(user));
    options.access_token = options.accessToken;
    if (options.roles) {
      const roles = [];
      for (let role of options.roles instanceof Collection ? options.roles.values() : options.roles) {
        role = this.roles.resolve(role);
        if (!role) {
          return Promise.reject(new TypeError('INVALID_TYPE', 'options.roles',
            'Array or Collection of Roles or Snowflakes', true));
        }
        roles.push(role.id);
      }
    }
    return this.client.api.guilds(this.id).members(user).put({ data: options })
      .then(data => this.members.add(data));
  }

  /**
   * Performs a search within the entire guild.
   * <warn>This is only available when using a user account.</warn>
   * @param {MessageSearchOptions} [options={}] Options to pass to the search
   * @returns {Promise<MessageSearchResult>}
   * @example
   * guild.search({
   *   content: 'discord.js',
   *   before: '2016-11-17'
   * })
   *   .then(res => {
   *     const hit = res.results[0].find(m => m.hit).content;
   *     console.log(`I found: **${hit}**, total results: ${res.total}`);
   *   })
   *   .catch(console.error);
   */
  search(options = {}) {
    return Shared.search(this, options);
  }

  /**
   * The data for editing a guild.
   * @typedef {Object} GuildEditData
   * @property {string} [name] The name of the guild
   * @property {string} [region] The region of the guild
   * @property {number} [verificationLevel] The verification level of the guild
   * @property {number} [explicitContentFilter] The level of the explicit content filter
   * @property {ChannelResolvable} [afkChannel] The AFK channel of the guild
   * @property {ChannelResolvable} [systemChannel] The system channel of the guild
   * @property {number} [afkTimeout] The AFK timeout of the guild
   * @property {Base64Resolvable} [icon] The icon of the guild
   * @property {GuildMemberResolvable} [owner] The owner of the guild
   * @property {Base64Resolvable} [splash] The splash screen of the guild
   */

  /**
   * Updates the guild with new information - e.g. a new name.
   * @param {GuildEditData} data The data to update the guild with
   * @param {string} [reason] Reason for editing this guild
   * @returns {Promise<Guild>}
   * @example
   * // Set the guild name and region
   * guild.edit({
   *   name: 'Discord Guild',
   *   region: 'london',
   * })
   *   .then(updated => console.log(`New guild name ${updated} in region ${updated.region}`))
   *   .catch(console.error);
   */
  edit(data, reason) {
    const _data = {};
    if (data.name) _data.name = data.name;
    if (data.region) _data.region = data.region;
    if (typeof data.verificationLevel !== 'undefined') _data.verification_level = Number(data.verificationLevel);
    if (typeof data.afkChannel !== 'undefined') {
      _data.afk_channel_id = this.client.channels.resolveID(data.afkChannel);
    }
    if (typeof data.systemChannel !== 'undefined') {
      _data.system_channel_id = this.client.channels.resolveID(data.systemChannel);
    }
    if (data.afkTimeout) _data.afk_timeout = Number(data.afkTimeout);
    if (typeof data.icon !== 'undefined') _data.icon = data.icon;
    if (data.owner) _data.owner_id = this.client.users.resolve(data.owner).id;
    if (data.splash) _data.splash = data.splash;
    if (typeof data.explicitContentFilter !== 'undefined') {
      _data.explicit_content_filter = Number(data.explicitContentFilter);
    }
    return this.client.api.guilds(this.id).patch({ data: _data, reason })
      .then(newData => this.client.actions.GuildUpdate.handle(newData).updated);
  }

  /**
   * Edits the level of the explicit content filter.
   * @param {number} explicitContentFilter The new level of the explicit content filter
   * @param {string} [reason] Reason for changing the level of the guild's explicit content filter
   * @returns {Promise<Guild>}
   */
  setExplicitContentFilter(explicitContentFilter, reason) {
    return this.edit({ explicitContentFilter }, reason);
  }

  /**
   * Edits the name of the guild.
   * @param {string} name The new name of the guild
   * @param {string} [reason] Reason for changing the guild's name
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild name
   * guild.setName('Discord Guild')
   *  .then(updated => console.log(`Updated guild name to ${guild}`))
   *  .catch(console.error);
   */
  setName(name, reason) {
    return this.edit({ name }, reason);
  }

  /**
   * Edits the region of the guild.
   * @param {string} region The new region of the guild
   * @param {string} [reason] Reason for changing the guild's region
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild region
   * guild.setRegion('london')
   *  .then(updated => console.log(`Updated guild region to ${guild.region}`))
   *  .catch(console.error);
   */
  setRegion(region, reason) {
    return this.edit({ region }, reason);
  }

  /**
   * Edits the verification level of the guild.
   * @param {number} verificationLevel The new verification level of the guild
   * @param {string} [reason] Reason for changing the guild's verification level
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild verification level
   * guild.setVerificationLevel(1)
   *  .then(updated => console.log(`Updated guild verification level to ${guild.verificationLevel}`))
   *  .catch(console.error);
   */
  setVerificationLevel(verificationLevel, reason) {
    return this.edit({ verificationLevel }, reason);
  }

  /**
   * Edits the AFK channel of the guild.
   * @param {ChannelResolvable} afkChannel The new AFK channel
   * @param {string} [reason] Reason for changing the guild's AFK channel
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild AFK channel
   * guild.setAFKChannel(channel)
   *  .then(updated => console.log(`Updated guild AFK channel to ${guild.afkChannel.name}`))
   *  .catch(console.error);
   */
  setAFKChannel(afkChannel, reason) {
    return this.edit({ afkChannel }, reason);
  }

  /**
   * Edits the system channel of the guild.
   * @param {ChannelResolvable} systemChannel The new system channel
   * @param {string} [reason] Reason for changing the guild's system channel
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild system channel
   * guild.setSystemChannel(channel)
   *  .then(updated => console.log(`Updated guild system channel to ${guild.systemChannel.name}`))
   *  .catch(console.error);
   */
  setSystemChannel(systemChannel, reason) {
    return this.edit({ systemChannel }, reason);
  }

  /**
   * Edits the AFK timeout of the guild.
   * @param {number} afkTimeout The time in seconds that a user must be idle to be considered AFK
   * @param {string} [reason] Reason for changing the guild's AFK timeout
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild AFK channel
   * guild.setAFKTimeout(60)
   *  .then(updated => console.log(`Updated guild AFK timeout to ${guild.afkTimeout}`))
   *  .catch(console.error);
   */
  setAFKTimeout(afkTimeout, reason) {
    return this.edit({ afkTimeout }, reason);
  }

  /**
   * Sets a new guild icon.
   * @param {Base64Resolvable|BufferResolvable} icon The new icon of the guild
   * @param {string} [reason] Reason for changing the guild's icon
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild icon
   * guild.setIcon('./icon.png')
   *  .then(updated => console.log('Updated the guild icon'))
   *  .catch(console.error);
   */
  async setIcon(icon, reason) {
    return this.edit({ icon: await DataResolver.resolveImage(icon), reason });
  }

  /**
   * Sets a new owner of the guild.
   * @param {GuildMemberResolvable} owner The new owner of the guild
   * @param {string} [reason] Reason for setting the new owner
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild owner
   * guild.setOwner(guild.members.first())
   *  .then(updated => console.log(`Updated the guild owner to ${updated.owner.displayName}`))
   *  .catch(console.error);
   */
  setOwner(owner, reason) {
    return this.edit({ owner }, reason);
  }

  /**
   * Sets a new guild splash screen.
   * @param {Base64Resolvable|BufferResolvable} splash The new splash screen of the guild
   * @param {string} [reason] Reason for changing the guild's splash screen
   * @returns {Promise<Guild>}
   * @example
   * // Edit the guild splash
   * guild.setSplash('./splash.png')
   *  .then(updated => console.log('Updated the guild splash'))
   *  .catch(console.error);
   */
  async setSplash(splash, reason) {
    return this.edit({ splash: await DataResolver.resolveImage(splash), reason });
  }

  /**
   * Sets the position of the guild in the guild listing.
   * <warn>This is only available when using a user account.</warn>
   * @param {number} position Absolute or relative position
   * @param {boolean} [relative=false] Whether to position relatively or absolutely
   * @returns {Promise<Guild>}
   */
  setPosition(position, relative) {
    if (this.client.user.bot) {
      return Promise.reject(new Error('FEATURE_USER_ONLY'));
    }
    return this.client.user.settings.setGuildPosition(this, position, relative);
  }

  /**
   * Marks all messages in this guild as read.
   * <warn>This is only available when using a user account.</warn>
   * @returns {Promise<Guild>}
   */
  acknowledge() {
    return this.client.api.guilds(this.id).ack
      .post({ data: { token: this.client.rest._ackToken } })
      .then(res => {
        if (res.token) this.client.rest._ackToken = res.token;
        return this;
      });
  }

  /**
   * Whether to allow direct messages from guild members.
   * <warn>This is only available when using a user account.</warn>
   * @param {boolean} allow Whether to allow direct messages
   * @returns {Promise<Guild>}
   */
  allowDMs(allow) {
    if (this.client.user.bot) return Promise.reject(new Error('FEATURE_USER_ONLY'));
    const settings = this.client.user.settings;
    if (allow) return settings.removeRestrictedGuild(this);
    else return settings.addRestrictedGuild(this);
  }

  /**
   * Syncs this guild (already done automatically every 30 seconds).
   * <warn>This is only available when using a user account.</warn>
   */
  sync() {
    if (!this.client.user.bot) this.client.syncGuilds([this]);
  }

  /**
   * The data needed for updating a channel's position.
   * @typedef {Object} ChannelPosition
   * @property {ChannelResolvable} channel Channel to update
   * @property {number} position New position for the channel
   */

  /**
   * Batch-updates the guild's channels' positions.
   * @param {ChannelPosition[]} channelPositions Channel positions to update
   * @returns {Promise<Guild>}
   * @example
   * guild.setChannelPositions([{ channel: channelID, position: newChannelIndex }])
   *   .then(guild => console.log(`Updated channel positions for ${guild}`))
   *   .catch(console.error);
   */
  setChannelPositions(channelPositions) {
    const updatedChannels = channelPositions.map(r => ({
      id: this.client.channels.resolveID(r.channel),
      position: r.position,
    }));

    return this.client.api.guilds(this.id).channels.patch({ data: updatedChannels }).then(() =>
      this.client.actions.GuildChannelsPositionUpdate.handle({
        guild_id: this.id,
        channels: updatedChannels,
      }).guild
    );
  }

  /**
   * Leaves the guild.
   * @returns {Promise<Guild>}
   * @example
   * // Leave a guild
   * guild.leave()
   *   .then(g => console.log(`Left the guild ${g}`))
   *   .catch(console.error);
   */
  leave() {
    if (this.ownerID === this.client.user.id) return Promise.reject(new Error('GUILD_OWNED'));
    return this.client.api.users('@me').guilds(this.id).delete()
      .then(() => this.client.actions.GuildDelete.handle({ id: this.id }).guild);
  }

  /**
   * Deletes the guild.
   * @returns {Promise<Guild>}
   * @example
   * // Delete a guild
   * guild.delete()
   *   .then(g => console.log(`Deleted the guild ${g}`))
   *   .catch(console.error);
   */
  delete() {
    return this.client.api.guilds(this.id).delete()
      .then(() => this.client.actions.GuildDelete.handle({ id: this.id }).guild);
  }

  /**
   * Whether this guild equals another guild. It compares all properties, so for most operations
   * it is advisable to just compare `guild.id === guild2.id` as it is much faster and is often
   * what most users need.
   * @param {Guild} guild The guild to compare with
   * @returns {boolean}
   */
  equals(guild) {
    let equal =
      guild &&
      guild instanceof this.constructor &&
      this.id === guild.id &&
      this.available === guild.available &&
      this.splash === guild.splash &&
      this.region === guild.region &&
      this.name === guild.name &&
      this.memberCount === guild.memberCount &&
      this.large === guild.large &&
      this.icon === guild.icon &&
      Util.arraysEqual(this.features, guild.features) &&
      this.ownerID === guild.ownerID &&
      this.verificationLevel === guild.verificationLevel &&
      this.embedEnabled === guild.embedEnabled;

    if (equal) {
      if (this.embedChannel) {
        if (!guild.embedChannel || this.embedChannel.id !== guild.embedChannel.id) equal = false;
      } else if (guild.embedChannel) {
        equal = false;
      }
    }

    return equal;
  }

  /**
   * When concatenated with a string, this automatically returns the guild's name instead of the Guild object.
   * @returns {string}
   * @example
   * // Logs: Hello from My Guild!
   * console.log(`Hello from ${guild}!`);
   */
  toString() {
    return this.name;
  }

  toJSON() {
    const json = super.toJSON({
      available: false,
      createdTimestamp: true,
      nameAcronym: true,
      presences: false,
      voiceStates: false,
    });
    json.iconURL = this.iconURL();
    json.splashURL = this.splashURL();
    return json;
  }

  /**
   * Creates a collection of this guild's roles, sorted by their position and IDs.
   * @returns {Collection<Role>}
   * @private
   */
  _sortedRoles() {
    return Util.discordSort(this.roles);
  }

  /**
   * Creates a collection of this guild's or a specific category's channels, sorted by their position and IDs.
   * @param {GuildChannel} [channel] Category to get the channels of
   * @returns {Collection<GuildChannel>}
   * @private
   */
  _sortedChannels(channel) {
    const category = channel.type === ChannelTypes.CATEGORY;
    return Util.discordSort(this.channels.filter(c =>
      c.type === channel.type && (category || c.parent === channel.parent)
    ));
  }

  /**
   * Handles a user speaking update in a voice channel.
   * @param {Snowflake} user ID of the user that the update is for
   * @param {boolean} speaking Whether the user is speaking
   * @private
   */
  _memberSpeakUpdate(user, speaking) {
    const member = this.members.get(user);
    if (member && member.speaking !== speaking) {
      member.speaking = speaking;
      /**
       * Emitted once a guild member starts/stops speaking.
       * @event Client#guildMemberSpeaking
       * @param {GuildMember} member The member that started/stopped speaking
       * @param {boolean} speaking Whether or not the member is speaking
       */
      this.client.emit(Events.GUILD_MEMBER_SPEAKING, member, speaking);
    }
  }
}

// TODO: Document this thing
class VoiceStateCollection extends Collection {
  constructor(guild) {
    super();
    this.guild = guild;
  }

  set(id, voiceState) {
    const member = this.guild.members.get(id);
    if (member) {
      if (member.voiceChannel && member.voiceChannel.id !== voiceState.channel_id) {
        member.voiceChannel.members.delete(member.id);
      }
      if (!voiceState.channel_id) member.speaking = null;
      const newChannel = this.guild.channels.get(voiceState.channel_id);
      if (newChannel) newChannel.members.set(member.user.id, member);
    }
    super.set(id, voiceState);
  }

  delete(id) {
    const voiceState = this.get(id);
    if (voiceState && voiceState.channel_id) {
      const channel = this.guild.channels.get(voiceState.channel_id);
      if (channel) channel.members.delete(id);
    }
    return super.delete(id);
  }
}

module.exports = Guild;