const base = () => (process.env.WHATSAPP_GATEWAY_URL || 'http://whatsapp-gateway:3200').replace(/\/$/, '')

export async function whatsappRequest(path, options = {}) {
  const token = String(process.env.WHATSAPP_GATEWAY_TOKEN || '')
  if (token.length < 24) {
    throw Object.assign(new Error('WhatsApp 网关令牌尚未配置'), { status: 503 })
  }
  const response = await fetch(`${base()}${path}`, {
    ...options,
    headers: {
      ...(options.body instanceof FormData ? {} : { 'content-type': 'application/json' }),
      authorization: `Bearer ${token}`,
      ...(options.headers || {}),
    },
  })
  const raw = await response.text()
  let result
  try { result = raw ? JSON.parse(raw) : null } catch { result = raw }
  if (!response.ok) {
    throw Object.assign(
      new Error(result?.message || `WhatsApp 网关请求失败 (${response.status})`),
      { status: response.status, data: result?.data },
    )
  }
  return result?.data ?? result
}

export function postWhatsApp(path, body) {
  return whatsappRequest(path, { method: 'POST', body: JSON.stringify(body) })
}

export function putWhatsApp(path, body) {
  return whatsappRequest(path, { method: 'PUT', body: JSON.stringify(body) })
}

export function uploadWhatsApp(path, formData) {
  return whatsappRequest(path, { method: 'POST', body: formData })
}