import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:http/http.dart' as http;
import 'package:jiffy/jiffy.dart';

import '../api_request.dart';
import '../errors/network_exception.dart';
import '../errors/parse_exception.dart';
import '../errors/server_exception.dart';

abstract class MhslApi<T> extends ApiRequest {
  String subpath;
  MhslApi(this.subpath);

  http.Response? response;

  Future<http.Response>? request(Uri uri);
  T assemble(String raw);

  Future<T> run() async {
    final endpoint = Uri.parse('https://mhsl.eu/marianum/marianummobile/$subpath');

    final http.Response data;
    try {
      final raw = await request(endpoint);
      if (raw == null) {
        throw const NetworkException(
          userMessage: 'Keine Antwort vom MHSL-Dienst erhalten.',
          technicalDetails: 'mhsl request returned null',
        );
      }
      data = raw;
    } on SocketException catch (e) {
      throw NetworkException(technicalDetails: 'mhsl $subpath: ${e.message}');
    } on TimeoutException catch (e) {
      throw NetworkException.timeout(technicalDetails: 'mhsl $subpath: $e');
    } on http.ClientException catch (e) {
      throw NetworkException(technicalDetails: 'mhsl $subpath: ${e.message}');
    }

    if (data.statusCode > 299) {
      throw ServerException(
        statusCode: data.statusCode,
        technicalDetails: 'mhsl $subpath HTTP ${data.statusCode}',
      );
    }

    try {
      return assemble(utf8.decode(data.bodyBytes));
    } catch (e) {
      throw ParseException(technicalDetails: 'mhsl $subpath assemble: $e');
    }
  }

  static String dateTimeToJson(DateTime time) => Jiffy.parseFromDateTime(time).format(pattern: 'yyyy-MM-dd HH:mm:ss');
  static DateTime dateTimeFromJson(String time) => DateTime.parse(time);
}