// Pure path helpers for the chat index cache. Kept in their own
// file so tests can compute expected paths without needing the
// summarizer / indexer modules (which transitively pull in the
// claude CLI spawn code).

import path from "node:path";
import { WORKSPACE_DIRS } from "../paths.js";

// Sourced from WORKSPACE_DIRS so the layout move in #284
// (`chat/` → `conversations/chat/`) can't drift again — a hardcoded
// literal here silently detached the indexer from the real session
// tree between Apr and Jul 2026, leaving every session listing
// preview to fall back to `meta.firstUserMessage` (issue #1902).
export const CHAT_DIR = WORKSPACE_DIRS.chat;
export const INDEX_DIR = "index";
export const MANIFEST_FILE = "manifest.json";

export function chatDirFor(workspaceRoot: string): string {
  return path.join(workspaceRoot, CHAT_DIR);
}

export function indexDirFor(workspaceRoot: string): string {
  return path.join(chatDirFor(workspaceRoot), INDEX_DIR);
}

export function sessionJsonlPathFor(workspaceRoot: string, sessionId: string): string {
  return path.join(chatDirFor(workspaceRoot), `${sessionId}.jsonl`);
}

export function sessionMetaPathFor(workspaceRoot: string, sessionId: string): string {
  return path.join(chatDirFor(workspaceRoot), `${sessionId}.json`);
}

export function indexEntryPathFor(workspaceRoot: string, sessionId: string): string {
  return path.join(indexDirFor(workspaceRoot), `${sessionId}.json`);
}

export function manifestPathFor(workspaceRoot: string): string {
  return path.join(indexDirFor(workspaceRoot), MANIFEST_FILE);
}