Errors

{
  "error": {
    "code": "PLAN_LIMIT_REACHED",
    "message": "You're at the top of your plan.",
    "action": "Move up a plan for more reads.",
    "retryable": false
  }
}

import type { ErrorCode } from '@/lib/errors';

interface ApiError {
  code: ErrorCode;
  message: string;
  action?: string;
  retryable: boolean;
}

async function callDacard<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`https://app.dacard.ai${path}`, init);
  if (!res.ok) {
    const body = (await res.json().catch(() => ({}))) as { error?: ApiError };
    const err = body.error;

    if (err?.code === 'CREDIT_EXHAUSTED' || err?.code === 'PLAN_LIMIT_REACHED') {
      // Stop. Surface the plan upgrade flow.
      throw new Error(err.message);
    }

    if (err?.retryable && res.status >= 500) {
      // Retry with exponential backoff (handled by the caller).
      throw Object.assign(new Error(err.message), { retryable: true });
    }

    throw new Error(err?.message ?? `HTTP ${res.status}`);
  }
  return res.json() as Promise<T>;
}