import 'dart:io';

import 'package:flutter/services.dart';

class TvPickerHandler {
  final String packageName;
  final String label;

  const TvPickerHandler({
    required this.packageName,
    required this.label,
  });
}

class TvMediaPickerUnavailable implements Exception {
  final String message;
  final List<TvPickerHandler> handlers;

  const TvMediaPickerUnavailable({
    required this.message,
    required this.handlers,
  });
}

class TvMediaPickerService {
  TvMediaPickerService._();
  static final TvMediaPickerService instance = TvMediaPickerService._();

  static const MethodChannel _channel =
      MethodChannel('jamshalat/tv_media_picker');

  Future<List<String>> pickImages({
    required bool allowMultiple,
  }) async {
    if (!Platform.isAndroid) return const [];

    try {
      final raw = await _channel.invokeMethod<List<dynamic>>(
        'pickImages',
        {'allowMultiple': allowMultiple},
      );
      if (raw == null) return const [];
      return raw
          .map((item) => item?.toString() ?? '')
          .where((path) => path.isNotEmpty)
          .toList(growable: false);
    } on PlatformException catch (error) {
      if (error.code == 'NO_PICKER') {
        throw TvMediaPickerUnavailable(
          message: error.message ??
              'Tidak ada aplikasi pemilih file yang kompatibel di perangkat.',
          handlers: _parseHandlers(error.details),
        );
      }
      rethrow;
    }
  }

  Future<List<TvPickerHandler>> listPickers() async {
    if (!Platform.isAndroid) return const [];
    final raw = await _channel.invokeMethod<List<dynamic>>('listPickers');
    return _parseHandlers(raw);
  }

  List<TvPickerHandler> _parseHandlers(dynamic raw) {
    if (raw is! List) return const [];
    final handlers = <TvPickerHandler>[];
    for (final item in raw) {
      if (item is! Map) continue;
      final packageName = item['packageName']?.toString() ?? '';
      final label = item['label']?.toString() ?? '';
      if (packageName.isEmpty) continue;
      handlers.add(
        TvPickerHandler(
          packageName: packageName,
          label: label.isEmpty ? packageName : label,
        ),
      );
    }
    return handlers;
  }
}