import "dart:typed_data";
import "package:flutter/foundation.dart";
import "../models/operations/trip.dart";
import "../models/brr_metadata.dart";
import "../exporters/brr_exporter.dart";
import "../exporters/arriva_brr_exporter.dart";
import "../exporters/stagecoach_brr_exporter.dart";

enum BRROperator { arriva, stagecoach }

class ExportResult {
  final Uint8List? bytes;
  final List<String> errors;
  bool get isSuccess => errors.isEmpty;

  ExportResult.success(this.bytes) : errors = [];
  ExportResult.error(this.errors) : bytes = null;
}

class BRRExportService {
  final BRROperator operator;

  BRRExportService({this.operator = BRROperator.arriva});

  BRRExporter get _exporter {
    switch (operator) {
      case BRROperator.arriva:
        return ArrivaBRRExporter();
      case BRROperator.stagecoach:
        return StagecoachBRRExporter();
    }
  }

  Future<ExportResult> exportBRR(
    List<Trip> trips,
    BRRMetadata metadata,
  ) async {
    try {
      final bytes = await _exporter.export(trips, metadata);
      return ExportResult.success(bytes);
    } catch (e, stackTrace) {
      debugPrint("[BRRExportService] exportBRR failed: $e");
      debugPrintStack(stackTrace: stackTrace);
      return ExportResult.error(["Export failed: $e"]);
    }
  }
}