/**
 * Persist portal direct-chat transcripts before Goosed escalation wipes snapshot cache.
 */

import { extractConversationMessageText } from './conversation-memory.mjs';

export function filterNonemptyUserVisibleMessages(messages) {
  if (!Array.isArray(messages)) return [];
  return messages.filter((message) => {
    if (message?.metadata?.userVisible === false) return false;
    return Boolean(extractConversationMessageText(message));
  });
}

export async function loadSnapshotMessages(sessionSnapshotService, sessionId) {
  if (!sessionSnapshotService?.get || !sessionId) return [];
  const snapshot = await sessionSnapshotService.get(sessionId).catch(() => null);
  return Array.isArray(snapshot?.messages) ? snapshot.messages : [];
}

export async function persistSessionTranscriptMessages({
  conversationMemoryService,
  sessionId,
  userId,
  messages,
} = {}) {
  if (!conversationMemoryService?.saveConversationMessages || !sessionId || !userId) {
    return { saved: 0, skipped: true };
  }
  const persistable = filterNonemptyUserVisibleMessages(messages);
  if (!persistable.length) return { saved: 0, skipped: true };
  const saved = await conversationMemoryService.saveConversationMessages(
    sessionId,
    userId,
    persistable,
  );
  return { saved: Array.isArray(saved) ? saved.length : persistable.length, skipped: false };
}

export async function persistSessionTranscriptFromSnapshot({
  sessionSnapshotService,
  conversationMemoryService,
  sessionId,
  userId,
  sourceSessionId = null,
} = {}) {
  const sourceIds = [...new Set([sourceSessionId, sessionId].filter(Boolean))];
  let totalSaved = 0;
  for (const sourceId of sourceIds) {
    const messages = await loadSnapshotMessages(sessionSnapshotService, sourceId);
    const result = await persistSessionTranscriptMessages({
      conversationMemoryService,
      sessionId,
      userId,
      messages,
    });
    totalSaved += result.saved;
  }
  return { saved: totalSaved };
}