import type { WorkerErrorData, WorkerMessageEnvelope } from './types'

function isRecordInternal(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null
}

export function isWorkerMessageEnvelope(value: unknown): value is WorkerMessageEnvelope {
  return isRecordInternal(value) && typeof value.type === 'string'
}

function readString(value: unknown): string | undefined {
  return typeof value === 'string' ? value : undefined
}

export function readWorkerErrorData(value: unknown): WorkerErrorData {
  if (!isRecordInternal(value)) {
    return { originalType: undefined, taskId: undefined, error: undefined }
  }
  return { originalType: readString(value.originalType), taskId: readString(value.taskId), error: readString(value.error) }
}

export function isWorkerErrorForOperation(errorData: WorkerErrorData, operation: string): boolean {
  if (errorData.originalType === operation) {
    return true
  }
  return errorData.taskId?.startsWith(operation) === true
}

export function isRecord(value: unknown): value is Record<string, unknown> {
  return isRecordInternal(value)
}