From 4faeab8bac8145c2b074bc9ee3a9c74b9bd677ea Mon Sep 17 00:00:00 2001
From: ITOH <72305210+itohatweb@users.noreply.github.com>
Date: Sun, 2 May 2021 16:35:26 +0200
Subject: [PATCH] add: startThread

---
 src/helpers/channels/threads/start_thread.ts | 38 ++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/helpers/channels/threads/start_thread.ts

diff --git a/src/helpers/channels/threads/start_thread.ts b/src/helpers/channels/threads/start_thread.ts
new file mode 100644
index 000000000..5fe429c22
--- /dev/null
+++ b/src/helpers/channels/threads/start_thread.ts
@@ -0,0 +1,38 @@
+import { cacheHandlers } from "../../../cache.ts";
+import { rest } from "../../../rest/rest.ts";
+import { ChannelTypes } from "../../../types/channels/channel_types.ts";
+import { StartThread } from "../../../types/channels/threads/start_thread.ts";
+import { Errors } from "../../../types/misc/errors.ts";
+import { endpoints } from "../../../util/constants.ts";
+import { camelKeysToSnakeCase } from "../../../util/utils.ts";
+
+/** 
+ * Creates a new public thread from an existing message. Returns a channel on success, and a 400 BAD REQUEST on invalid parameters. Fires a Thread Create Gateway event. 
+ * @param messageId when provided the thread will be public
+ */
+export async function startThread(
+  channelId: string,
+  options: StartThread & { messageId?: string },
+) {
+  const channel = await cacheHandlers.get("channels", channelId);
+  if (channel) {
+    // TODO(threads): perm check
+    if (
+      ![ChannelTypes.GuildText, ChannelTypes.GuildNews].includes(channel.type)
+    ) {
+      throw new Error(Errors.INVALID_THREAD_PARENT_CHANNEL_TYPE);
+    }
+
+    if (!options.messageId && channel.type === ChannelTypes.GuildNews) {
+      throw new Error(Errors.GUILD_NEWS_CHANNEL_ONLY_SUPPORT_PUBLIC_THREADS);
+    }
+  }
+
+  return rest.runMethod(
+    "post",
+    options?.messageId
+      ? endpoints.THREAD_START_PUBLIC(channelId, options.messageId)
+      : endpoints.THREAD_START_PRIVATE(channelId),
+    camelKeysToSnakeCase(options),
+  );
+}