import 'package:dio/dio.dart';
import '../core/api/api_client.dart';
import '../core/exceptions.dart';
import '../core/models/page_result.dart';
import '../models/finance.dart';

class FinanceRepository {
  final ApiClient _client;
  const FinanceRepository(this._client);

  Future<PageResult<FinanceRecord>> listRecords({
    String? type,
    String? month,
    String? startDate,
    String? endDate,
    int? partnerId,
    int page = 1,
    int pageSize = 50,
  }) async {
    try {
      final params = <String, dynamic>{
        'page': page,
        'page_size': pageSize,
        if (type != null && type.isNotEmpty) 'type': type,
        if (month != null && month.isNotEmpty) 'month': month,
        if (startDate != null && startDate.isNotEmpty) 'start_date': startDate,
        if (endDate != null && endDate.isNotEmpty) 'end_date': endDate,
        if (partnerId != null) 'partner_id': partnerId,
      };
      final resp = await _client.get('/finance/records', params: params);
      return PageResult.fromJson(
        resp.data as Map<String, dynamic>,
        FinanceRecord.fromJson,
      );
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '获取财务记录失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 按往来单位汇总未结清应收/应付（GET /finance/summary）
  Future<List<PartnerFinanceSummary>> partnerSummary() async {
    try {
      final resp = await _client.get('/finance/summary');
      final data = (resp.data as Map<String, dynamic>)['data'];
      return [
        for (final row in (data as List? ?? const []))
          PartnerFinanceSummary.fromJson(row as Map<String, dynamic>),
      ];
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '获取往来汇总失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 近 N 个自然月收支趋势（GET /finance/trend）：in=当月销售额、out=当月采购额。
  Future<List<TrendPoint>> trend({int months = 6}) async {
    try {
      final resp =
          await _client.get('/finance/trend', params: {'months': months});
      final data = (resp.data as Map<String, dynamic>)['data'];
      return [
        for (final row in (data as List? ?? const []))
          TrendPoint.fromJson(row as Map<String, dynamic>),
      ];
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '获取收支趋势失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  Future<void> create(Map<String, dynamic> body) async {
    try {
      await _client.post('/finance/records', data: body);
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '创建记录失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  Future<void> close(int id) async {
    try {
      await _client.put('/finance/records/$id/close');
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '操作失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  Future<void> closeByRef(String refType, int refId) async {
    try {
      await _client
          .put('/finance/records/close-by-ref?ref_type=$refType&ref_id=$refId');
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '结清失败',
        statusCode: e.response?.statusCode,
      );
    }
  }
}