import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:dio/dio.dart';
import '../../core/api/api_client.dart';
import '../../shared/models/contract.dart';

// StateNotifier-based list provider (fixes Map equality bug)
class ContractListNotifier extends StateNotifier<AsyncValue<PagedContracts>> {
  ContractListNotifier() : super(const AsyncLoading()) {
    load();
  }

  Future<void> load({String? filter, String? search, int page = 1}) async {
    state = const AsyncLoading();
    try {
      final params = <String, dynamic>{'page': page, 'limit': 20};
      if (filter != null && filter != 'all') params['status'] = filter;
      if (search != null && search.isNotEmpty) params['search'] = search;
      final resp = await apiDio.get('/contracts', queryParameters: params);
      state = AsyncData(PagedContracts.fromJson(resp.data));
    } catch (e) {
      state = AsyncError(e, StackTrace.current);
    }
  }
}

final contractListProvider = StateNotifierProvider<ContractListNotifier, AsyncValue<PagedContracts>>(
  (_) => ContractListNotifier(),
);

final contractDetailProvider = FutureProvider.autoDispose.family<Contract, int>((ref, id) async {
  final resp = await apiDio.get('/contracts/$id');
  return Contract.fromJson(resp.data);
});

Future<ContractAnalysis> analyzePdf(String filePath, String fileName) async {
  final formData = FormData.fromMap({
    'file': await MultipartFile.fromFile(filePath, filename: fileName),
  });
  final resp = await apiDio.post(
    '/contracts/analyze-pdf',
    data: formData,
    options: Options(receiveTimeout: const Duration(seconds: 300)),
  );
  return ContractAnalysis.fromJson(resp.data);
}

Future<Contract> createContract(Map<String, dynamic> data) async {
  final resp = await apiDio.post('/contracts', data: data);
  return Contract.fromJson(resp.data);
}

Future<Contract> updateContract(int id, Map<String, dynamic> data) async {
  final resp = await apiDio.put('/contracts/$id', data: data);
  return Contract.fromJson(resp.data);
}

Future<Contract> uploadContractFile(int id, String filePath, String fileName) async {
  final formData = FormData.fromMap({
    'file': await MultipartFile.fromFile(filePath, filename: fileName),
  });
  final resp = await apiDio.post('/contracts/$id/file', data: formData);
  return Contract.fromJson(resp.data);
}