import 'package:dio/dio.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/network/api_exception.dart';
import '../core/network/dio_client.dart';
import '../models/ocr_result.dart';

final ocrApiProvider = Provider<OcrApi>((ref) => OcrApi(ref.watch(dioProvider)));

class OcrApi {
  final Dio _dio;

  OcrApi(this._dio);

  /// 上传图片识别账单，字段名固定为 file（与 uniApp upload 对齐）。
  /// 后端可能返回裸数组或 {code, data:[...]}，两种都兼容。
  Future<List<OcrResult>> recognize(String filePath) async {
    try {
      final formData = FormData.fromMap({
        'file': await MultipartFile.fromFile(filePath, filename: 'receipt.jpg'),
      });
      final res = await _dio.post('/ocr/recognize', data: formData);
      final data = res.data;
      List<dynamic> list;
      if (data is List) {
        list = data;
      } else if (data is Map && data['data'] is List) {
        list = data['data'] as List;
      } else {
        throw ApiException(-1, '未识别到账单信息');
      }
      return list
          .whereType<Map<String, dynamic>>()
          .map(OcrResult.fromJson)
          .toList();
    } on DioException catch (e) {
      final err = e.error;
      throw err is ApiException ? err : ApiException(-1, '识别失败，请重试');
    }
  }
}