refactor(helpers): separate functions into files (#667)

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/webhooks/execute_webhook.ts

@@ -0,0 +1,67 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { structures } from "../../structures/mod.ts";
+import {
+  Errors,
+  ExecuteWebhookOptions,
+  MessageCreateOptions,
+} from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+
+/** Execute a webhook with webhook ID and webhook token */
+export async function executeWebhook(
+  webhookID: string,
+  webhookToken: string,
+  options: ExecuteWebhookOptions,
+) {
+  if (!options.content && !options.file && !options.embeds) {
+    throw new Error(Errors.INVALID_WEBHOOK_OPTIONS);
+  }
+
+  if (options.content && options.content.length > 2000) {
+    throw Error(Errors.MESSAGE_MAX_LENGTH);
+  }
+
+  if (options.embeds && options.embeds.length > 10) {
+    options.embeds.splice(10);
+  }
+
+  if (options.mentions) {
+    if (options.mentions.users?.length) {
+      if (options.mentions.parse.includes("users")) {
+        options.mentions.parse = options.mentions.parse.filter(
+          (p) => p !== "users",
+        );
+      }
+
+      if (options.mentions.users.length > 100) {
+        options.mentions.users = options.mentions.users.slice(0, 100);
+      }
+    }
+
+    if (options.mentions.roles?.length) {
+      if (options.mentions.parse.includes("roles")) {
+        options.mentions.parse = options.mentions.parse.filter(
+          (p) => p !== "roles",
+        );
+      }
+
+      if (options.mentions.roles.length > 100) {
+        options.mentions.roles = options.mentions.roles.slice(0, 100);
+      }
+    }
+  }
+
+  const result = await RequestManager.post(
+    `${endpoints.WEBHOOK(webhookID, webhookToken)}${
+      options.wait ? "?wait=true" : ""
+    }`,
+    {
+      ...options,
+      allowed_mentions: options.mentions,
+      avatar_url: options.avatar_url,
+    },
+  );
+  if (!options.wait) return;
+
+  return structures.createMessageStruct(result as MessageCreateOptions);
+}