1 files changed, 74 insertions, 0 deletions
diff --git a/src/sys/handler/index.ts b/src/sys/handler/index.ts
new file mode 100644
index 0000000..c9a5343
--- /dev/null
+++ b/src/sys/handler/index.ts
@@ -0,0 +1,74 @@
+import { REST } from "@discordjs/rest";
+import {
+  APIApplicationCommandInteraction,
+  APIInteraction,
+  APIInteractionResponse,
+  APIInteractionResponseCallbackData,
+  InteractionType,
+  RESTPostAPIApplicationCommandsJSONBody,
+  RESTPostAPIChatInputApplicationCommandsJSONBody,
+  Routes,
+} from "discord-api-types/v10";
+
+export * from "./builder";
+
+export type PromiseLike<T> = T | Promise<T>;
+/**
+ * A simple function that executes a slash command.
+ */
+export type HandlerFn = (
+  data: APIApplicationCommandInteraction
+) => PromiseLike<APIInteractionResponseCallbackData>;
+
+export type Command = {
+  json: RESTPostAPIChatInputApplicationCommandsJSONBody;
+  handler: HandlerFn;
+};
+
+/**
+ * Register all the commands to discord
+ * @param commands List of commands to register
+ * @param rest Rest api instance
+ * @param applicationId Current application id
+ */
+export const registerCommands = async (
+  commands: Iterable<Command>,
+  rest: REST,
+  applicationId: string
+) => {
+  await rest.post(Routes.applicationCommands(applicationId), {
+    body: [...commands].map(
+      (x) => x.json
+    ) as RESTPostAPIApplicationCommandsJSONBody[],
+  });
+};
+
+/**
+ * Creates a new handler to handle the slash commands.
+ * @param commands List of commands to handle
+ * @returns Handler function
+ */
+export const buildHandler = (commands: Iterable<Command>) => {
+  let internal: Map<String, Command> = new Map();
+  for (const command of commands) {
+    internal.set(command.json.name, command);
+  }
+
+  return async (
+    event: APIInteraction,
+    reply?: (data: APIInteractionResponseCallbackData) => void
+  ) => {
+    console.log("executing: ", event.data);
+    if (event.type === InteractionType.ApplicationCommand) {
+      console.log("executing: ", event.data);
+      let command = internal.get(event.data.name);
+
+      if (command) {
+        let data = await command.handler(event);
+        console.log("sending reply", data);
+
+        reply(data);
+      }
+    }
+  };
+};