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

import 'dart:core';
import 'dart:convert';

import 'transport_helper.dart';

class ApiHandler {
  // TODO: Split next line for better Error Handling
  static final String baseUrl = dotenv.get("VBB_API_URL");
  static final String accessID = dotenv.get("VBB_API_KEY");

  // TODO: function calls for the following API calls
  //   - [x] location.name: findStations
  //   - [ ] location.nearbystops
  //   - [ ] location.details
  //   - [ ] departureBoard
  //   - [ ] multiDepartureBoard
  //   - [ ] journeyDetails

  //static Future<Map<String, dynamic>> findStations(String locationName) async {
  static Future<List<Station>> findStations(
    String locationName, {
    int? maxStations = 5,
  }) async {
    String urlPath = '/api/fahrinfo/latest/location.name';
    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'input': locationName,
      'maxNo': maxStations.toString(),
      'type': 'S', // Station/Stops only
    });
    //print(url);
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;
    //print(httpPackageJson["stopLocationOrCoordLocation"]);
    List<Station> stationList = httpPackageJson["stopLocationOrCoordLocation"]
        .map(
          (x) => Station.fromJson(x["StopLocation"]),
        )
        .toList()
        .cast<Station>();
    return stationList;
  }

  static Future<List<Station>> nearbyStations(
    String latitude,
    String longitude, {
    int? maxStations = 5,
  }) async {
    String urlPath = '/api/fahrinfo/latest/location.nearbystops';
    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'originCoordLat': latitude,
      'originCoordLong': longitude,
      'maxNo': maxStations.toString(),
      'type': 'S', // Station/Stops only
    });
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;
    final stationList = httpPackageJson["stopLocationOrCoordLocation"].map(
      (x) => Station.fromJson(x["StopLocation"]),
    );
    return stationList;
  }

  static Future<List<Departure>> departures(
    String stationId, {
    int? maxDepartures = -1,
    int? duration = 0,
  }) async {
    String urlPath = '/api/fahrinfo/latest/departureBoard';
    String stationString = stationId.replaceAll(' ', '%20'); // reform for URL

    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'id': stationString,
      ////'time': /current time //time from which departures will be shown
      'duration': duration.toString(), //interval time in minutes
      'maxJourneys': maxDepartures.toString(),
      //'type': 'S', // Station/Stops only
    });
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;

    // try {
    List<Departure> departureList = httpPackageJson["Departure"]
        .map(
          (x) => Departure.fromJson(x),
        )
        .toList()
        .cast<Departure>();
    return departureList;
    // } catch (e) {
    //  //  TODO: logging
    //   // empty response
    //   print('Error: $e');
    //   // print(
    //   //   'Response for Station-id "$stationString" contains no field "Departure": $httpPackageJson',
    //   // );
    //   return [];
    // }
  }

  static Future<List<Departure>> departuresAggregate(
    List<String> stationList, {
    int? maxDepartures = -1,
    int? duration = -1,
  }) async {
    String urlPath = '/api/fahrinfo/latest/multiDepartureBoard';
    String stationListString = stationList
        .reduce((value, element) => value + '|' + element)
        .replaceAll(' ', '%20'); // reform for URL

    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'id': stationListString,
      ////'time': /current time //time from which departures will be shown
      'duration': duration.toString(), //interval time in minutes
      'maxJourneys': maxDepartures.toString(),
      'type': 'S', // Station/Stops only
    });
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;
    List<Departure> departureList = httpPackageJson["Departure"].map(
      (x) => Departure.fromJson(x),
    );
    return departureList;
  }

  static Future<List<String>> trip(
    String originId,
    String destinationId, {
    String? via,
    String? viaID,
    String? date,
    String? time,
    int? maxChange,
    int? minChangeTime,
    int? maxChangeTime,
    bool? arrivalTime,
    // int? products, // which transport modi to use - ignore for now
    // String rtMode, // wherether to use real time data
    // String trainFilter,
  }) async {
    String urlPath = '/api/fahrinfo/latest/trip';
    String startId = originId.replaceAll(' ', '%20'); // reform for URL
    String endId = destinationId.replaceAll(' ', '%20'); // reform for URL

    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'originId': startId,
      'destId': endId,
      ////'time': /current time //time from which departures will be shown
      'time': time.toString(), //interval time in minutes
      'maxChange': maxChange.toString(),
      'type': 'S', // Station/Stops only
    });
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;
    final idList = httpPackageJson["Trip"].map(
      (x) => x["LegList"]["Leg"].map((y) => y["JourneyDetail"]["ref"]),
    );
    return idList;
  }

  static Future<List<String>> tripDetail(
    String id, {
    String? date,
    String? fromId,
    int? fromIdx,
    String? toId,
    int? toIdx,
  }) async {
    String urlPath = '/api/fahrinfo/latest/journeyDetail';
    Uri url = Uri.https(baseUrl, urlPath, {
      'accessId': accessID,
      'id': id,
      'fromId': fromId,
      'toId': toId,
    });
    var jsonResponse = await http.get(
      url,
      headers: {'Accept': 'application/json'},
    );
    final httpPackageJson =
        json.decode(jsonResponse.body) as Map<String, dynamic>;
    final idList = httpPackageJson["Stops"]["Stop"].map((x) => x["id"]);
    return idList;
  }
}