/**
 * HttpInterceptor — wraps the global fetch to automatically report
 * HTTP error responses (4xx / 5xx) through XLog.captureError.
 *
 * Usage:
 *   HttpInterceptor.start(XLog.captureError.bind(XLog))
 */

type OnError = (error: unknown, meta?: Record<string, unknown>) => void

let _originalFetch: typeof fetch | null = null

export const HttpInterceptor = {
  start(onError: OnError): void {
    if (_originalFetch) return  // already installed

    _originalFetch = global.fetch

    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    ;(global as any).fetch = async (
      input: RequestInfo | URL,
      init?: RequestInit,
    ): Promise<Response> => {
      const original = _originalFetch!
      try {
        const res = await original(input, init)
        if (!res.ok) {
          const url = typeof input === 'string' ? input : input instanceof URL ? input.toString() : input.url
          onError(new Error(`HTTP ${res.status} ${res.statusText}`), {
            type: 'api_error',
            url,
            status: res.status,
          })
        }
        return res
      } catch (e) {
        const url = typeof input === 'string' ? input : input instanceof URL ? input.toString() : input.url
        onError(e, { type: 'api_error', url })
        throw e
      }
    }
  },

  stop(): void {
    if (_originalFetch) {
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      ;(global as any).fetch = _originalFetch
      _originalFetch = null
    }
  },
}