/**
 * Resolve the accounts directory.
 *
 * Priority:
 * 1. WEIXIN_MCP_DIR env var (explicit override)
 * 2. If OpenClaw state dir exists → ~/.openclaw/openclaw-weixin/accounts/ (backward compat)
 * 3. Default → ~/.weixin-mcp/accounts/
 */

import fs from "node:fs";
import path from "node:path";
import os from "node:os";

function resolveAccountsDir(): string {
  // Explicit override
  if (process.env.WEIXIN_MCP_DIR?.trim()) {
    return process.env.WEIXIN_MCP_DIR.trim();
  }

  // OpenClaw compat: if the OpenClaw weixin accounts dir exists, use it
  const openclawStateDir =
    process.env.OPENCLAW_STATE_DIR?.trim() ||
    process.env.CLAWDBOT_STATE_DIR?.trim() ||
    path.join(os.homedir(), ".openclaw");

  const openclawAccountsDir = path.join(openclawStateDir, "openclaw-weixin", "accounts");
  if (fs.existsSync(openclawAccountsDir)) {
    return openclawAccountsDir;
  }

  // Default: standalone ~/.weixin-mcp/accounts/
  return path.join(os.homedir(), ".weixin-mcp", "accounts");
}

export const ACCOUNTS_DIR = resolveAccountsDir();