feat: GuildEmbed support (#2766)

* feat: Guild embed support

* docs: Fixed setEmbed's reason argument not being optional

* fix: Guild#setEmbed should return the guild itself for consistency

* docs: Updated typings

* fix: Requested change

src/structures/Guild.js

@@ -483,6 +483,29 @@ class Guild extends Base {
     });
   }
 
+  /**
+   * The Guild Embed object
+   * @typedef {Object} GuildEmbedData
+   * @property {boolean} enabled Whether the embed is enabled
+   * @property {?GuildChannel} channel The embed channel
+   */
+
+  /**
+   * Fetches the guild embed.
+   * @returns {Promise<GuildEmbedData>}
+   * @example
+   * // Fetches the guild embed
+   * guild.fetchEmbed()
+   *   .then(embed => console.log(`The embed is ${embed.enabled ? 'enabled' : 'disabled'}`))
+   *   .catch(console.error);
+   */
+  fetchEmbed() {
+    return this.client.api.guilds(this.id).embed.get().then(data => ({
+      enabled: data.enabled,
+      channel: data.channel_id ? this.channels.get(data.channel_id) : null,
+    }));
+  }
+
   /**
    * Fetches audit logs for this guild.
    * @param {Object} [options={}] Options for fetching audit logs
@@ -790,6 +813,22 @@ class Guild extends Base {
     );
   }
 
+  /**
+   * Edits the guild's embed.
+   * @param {GuildEmbedData} embed The embed for the guild
+   * @param {string} [reason] Reason for changing the guild's embed
+   * @returns {Promise<Guild>}
+   */
+  setEmbed(embed, reason) {
+    return this.client.api.guilds(this.id).embed.patch({
+      data: {
+        enabled: embed.enabled,
+        channel_id: this.channels.resolveID(embed.channel),
+      },
+      reason,
+    }).then(() => this);
+  }
+
   /**
    * Leaves the guild.
    * @returns {Promise<Guild>}