toOpenAIMessages: also return the username to user id map

This will be used for fetching user descriptions very soon

src/execution.ts

@@ -237,7 +237,7 @@ async function executeFromQueue(channel: string) {
       return b.createdTimestamp - a.createdTimestamp;
     });
 
-    OpenAImessages = toOpenAIMessages(messages.values());
+    [OpenAImessages] = toOpenAIMessages(messages.values());
     let generatedMessage: ChatCompletionMessage | undefined = undefined;
     let answer: Awaited<ReturnType<typeof openai.chat.completions.create>>;
 

src/toOpenAIMessages.ts

@@ -95,28 +95,34 @@ function getAuthorUsername(message: DiscordMessage): string | undefined {
 /**
  * Converts the Iterable of Discord Messages to array of OpenAI Messages to send
  * first message in the interable will be the last of the returned array (reverse order)
+ * (first should be newest)
  * @param messages the iterable to convert
- * @returns the converted messages
+ * @returns [0] the converted messages
+ * @returns [1] username mappings to id
  */
 export default function toOpenAIMessages(
   messages: Iterable<DiscordMessage>,
-): OpenAIMessage[] {
-  const rvalue: OpenAIMessage[] = [];
+): [OpenAIMessage[], Map<string, string>] {
+  const rmessages: OpenAIMessage[] = [];
+  const rUserMap = new Map<string, string>();
   let tokenCount = 0;
 
   for (const message of messages) {
+    // FIXME: multiple users could have the same name here.
     const content = formatMessage(message);
     // FIXME: tokens are not being counted properly (it's lower than it is) but it's enough for me for now.
     tokenCount += countTokens(content);
     if (tokenCount > config.readLimits.tokens) break;
-    rvalue.push({
+    const name = getAuthorUsername(message);
+    rmessages.push({
       role: message.author.id === message.client.user.id ? "assistant" : "user",
       content: content,
-      name: getAuthorUsername(message),
+      name: name,
     });
+    if (name && rUserMap.has(name)) rUserMap.set(name, message.author.id);
   }
 
-  rvalue.push(...config.systemPrompt([...messages][0]).reverse());
+  rmessages.push(...config.systemPrompt([...messages][0]).reverse());
 
-  return rvalue.reverse();
+  return [rmessages.reverse(), rUserMap];
 }