import '../../models/document_model.dart';

enum PollOutcomeKind { done, failed, pending }

/// Result of inspecting a single `GET /documents/:id` poll response.
/// Deliberately separated from the Dio call site
/// (`pending_documents_provider.dart`'s `_pollUntilParsed`) so the
/// parse-status branching is unit-testable without mocking network I/O -
/// mirrors the pure-function pattern already used for `document_sync_merge.dart`
/// (task 6.2) and `product_scan_response_parser.dart` (task 7.1).
class PollOutcome {
  final PollOutcomeKind kind;
  final DocumentModel? document;
  final String? message;

  const PollOutcome._(this.kind, {this.document, this.message});

  factory PollOutcome.done(DocumentModel document) =>
      PollOutcome._(PollOutcomeKind.done, document: document);

  factory PollOutcome.failed(String message) =>
      PollOutcome._(PollOutcomeKind.failed, message: message);

  static const PollOutcome pending = PollOutcome._(PollOutcomeKind.pending);
}

/// `parseStatus` absent/unrecognized (a legacy/cached response predating
/// backend task 9.1) is treated the same as `"pending"` - keep polling rather
/// than surface a false failure.
PollOutcome resolvePollOutcome(DocumentModel fetched) {
  switch (fetched.parseStatus) {
    case 'done':
      return PollOutcome.done(fetched);
    case 'failed':
      return PollOutcome.failed('Gagal mengekstrak data (parsing gagal di server).');
    default:
      return PollOutcome.pending;
  }
}