import 'dart:convert';
import 'package:dio/dio.dart';
import '../../core/constants/app_constants.dart';
import '../../core/errors/exceptions.dart';
import '../../domain/entities/contenedor.dart';
import '../../domain/entities/destino.dart';

class BackendApi {
  final Dio _dio;

  BackendApi() : _dio = Dio() {
    _dio.options.connectTimeout = AppConstants.httpTimeout;
    _dio.options.receiveTimeout = AppConstants.httpTimeout;
  }

  Future<Map<String, dynamic>> enviarContenedor(
    Contenedor contenedor,
    Destino destino,
  ) async {
    try {
      final archivosJson = contenedor.archivos.map((a) => {
            'nombre': a.nombre,
            'tipo': a.mimeType,
            'contenido': base64Encode(a.bytes),
          }).toList();

      final response = await _dio.post(
        '${destino.url}/ingest',
        options: Options(
          headers: {
            'X-Auth-Key': destino.hash,
            'Content-Type': 'application/json',
          },
        ),
        data: {
          'hash': contenedor.hash,
          if (contenedor.titulo != null) 'titulo': contenedor.titulo,
          if (contenedor.descripcion != null) 'descripcion': contenedor.descripcion,
          'etiquetas': contenedor.etiquetas,
          if (contenedor.gps != null) 'gps': contenedor.gps!.toJson(),
          'archivos': archivosJson,
        },
      );

      return response.data as Map<String, dynamic>;
    } on DioException catch (e) {
      if (e.response?.statusCode == 409) {
        throw HashExistsException();
      }
      throw NetworkException(
        e.message ?? 'Network error',
        code: e.response?.statusCode?.toString(),
      );
    }
  }

  Future<String> initChunkUpload(
    String hash,
    int totalChunks,
    String fileName,
    Destino destino,
  ) async {
    try {
      final response = await _dio.post(
        '${destino.url}/upload/init',
        options: Options(
          headers: {'X-Auth-Key': destino.hash},
        ),
        data: {
          'hash': hash,
          'total_chunks': totalChunks,
          'file_name': fileName,
        },
      );
      return response.data['upload_id'] as String;
    } on DioException catch (e) {
      throw NetworkException(e.message ?? 'Failed to init upload');
    }
  }

  Future<void> uploadChunk(
    String uploadId,
    int chunkNumber,
    List<int> bytes,
    Destino destino,
  ) async {
    try {
      await _dio.post(
        '${destino.url}/upload/chunk/$uploadId/$chunkNumber',
        options: Options(
          headers: {
            'X-Auth-Key': destino.hash,
            'Content-Type': 'application/octet-stream',
          },
        ),
        data: bytes,
      );
    } on DioException catch (e) {
      throw NetworkException(e.message ?? 'Failed to upload chunk');
    }
  }

  Future<Map<String, dynamic>> completeUpload(
    String uploadId,
    Destino destino,
  ) async {
    try {
      final response = await _dio.post(
        '${destino.url}/upload/complete/$uploadId',
        options: Options(
          headers: {'X-Auth-Key': destino.hash},
        ),
      );
      return response.data as Map<String, dynamic>;
    } on DioException catch (e) {
      throw NetworkException(e.message ?? 'Failed to complete upload');
    }
  }
}