refactor: modularize slack/config/cron/daemon internals

src/slack/monitor/message-handler/prepare-content.ts

@@ -0,0 +1,106 @@
+import { logVerbose } from "../../../globals.js";
+import type { SlackFile, SlackMessageEvent } from "../../types.js";
+import {
+  MAX_SLACK_MEDIA_FILES,
+  resolveSlackAttachmentContent,
+  resolveSlackMedia,
+  type SlackMediaResult,
+  type SlackThreadStarter,
+} from "../media.js";
+
+export type SlackResolvedMessageContent = {
+  rawBody: string;
+  effectiveDirectMedia: SlackMediaResult[] | null;
+};
+
+function filterInheritedParentFiles(params: {
+  files: SlackFile[] | undefined;
+  isThreadReply: boolean;
+  threadStarter: SlackThreadStarter | null;
+}): SlackFile[] | undefined {
+  const { files, isThreadReply, threadStarter } = params;
+  if (!isThreadReply || !files?.length) {
+    return files;
+  }
+  if (!threadStarter?.files?.length) {
+    return files;
+  }
+  const starterFileIds = new Set(threadStarter.files.map((file) => file.id));
+  const filtered = files.filter((file) => !file.id || !starterFileIds.has(file.id));
+  if (filtered.length < files.length) {
+    logVerbose(
+      `slack: filtered ${files.length - filtered.length} inherited parent file(s) from thread reply`,
+    );
+  }
+  return filtered.length > 0 ? filtered : undefined;
+}
+
+export async function resolveSlackMessageContent(params: {
+  message: SlackMessageEvent;
+  isThreadReply: boolean;
+  threadStarter: SlackThreadStarter | null;
+  isBotMessage: boolean;
+  botToken: string;
+  mediaMaxBytes: number;
+}): Promise<SlackResolvedMessageContent | null> {
+  const ownFiles = filterInheritedParentFiles({
+    files: params.message.files,
+    isThreadReply: params.isThreadReply,
+    threadStarter: params.threadStarter,
+  });
+
+  const media = await resolveSlackMedia({
+    files: ownFiles,
+    token: params.botToken,
+    maxBytes: params.mediaMaxBytes,
+  });
+
+  const attachmentContent = await resolveSlackAttachmentContent({
+    attachments: params.message.attachments,
+    token: params.botToken,
+    maxBytes: params.mediaMaxBytes,
+  });
+
+  const mergedMedia = [...(media ?? []), ...(attachmentContent?.media ?? [])];
+  const effectiveDirectMedia = mergedMedia.length > 0 ? mergedMedia : null;
+  const mediaPlaceholder = effectiveDirectMedia
+    ? effectiveDirectMedia.map((item) => item.placeholder).join(" ")
+    : undefined;
+
+  const fallbackFiles = ownFiles ?? [];
+  const fileOnlyFallback =
+    !mediaPlaceholder && fallbackFiles.length > 0
+      ? fallbackFiles
+          .slice(0, MAX_SLACK_MEDIA_FILES)
+          .map((file) => file.name?.trim() || "file")
+          .join(", ")
+      : undefined;
+  const fileOnlyPlaceholder = fileOnlyFallback ? `[Slack file: ${fileOnlyFallback}]` : undefined;
+
+  const botAttachmentText =
+    params.isBotMessage && !attachmentContent?.text
+      ? (params.message.attachments ?? [])
+          .map((attachment) => attachment.text?.trim() || attachment.fallback?.trim())
+          .filter(Boolean)
+          .join("\n")
+      : undefined;
+
+  const rawBody =
+    [
+      (params.message.text ?? "").trim(),
+      attachmentContent?.text,
+      botAttachmentText,
+      mediaPlaceholder,
+      fileOnlyPlaceholder,
+    ]
+      .filter(Boolean)
+      .join("\n") || "";
+  if (!rawBody) {
+    return null;
+  }
+
+  return {
+    rawBody,
+    effectiveDirectMedia,
+  };
+}