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

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:intl/intl.dart';
import 'package:queue_mgr/backend/DebugHelper.dart';
import 'package:queue_mgr/backend/Dialogs.dart';
// DateFormat dateFormat;

final String API_ENDPOINT= "https://vps.playpoolstudios.com/qms/api/";
DateFormat dateFormat = DateFormat("yyyy/MM/dd");
DateFormat timeFormat = DateFormat("hh:mm a");
DateFormat dateTimeFormat = DateFormat("yyyy/MM/dd hh:mm a");
class DataManager{
  static _DataManager? m_instance = null;
  static _DataManager instance(){
    m_instance ??= _DataManager();
    return m_instance!;
  }

}


class _DataManager{
  _DataManager();

  List<dynamic> services = [];

 
  Future<void> GetData() async{
    try{
      var response = (await http.post(
          Uri.parse('${API_ENDPOINT}get_services.php'),
          body: <String, String>{}));
      Debug.LogResponse(response.body.toString());
      services = jsonDecode(response.body.toString());
      Debug.LogResponse(services);
    }catch(e){
      Debug.LogError(e);
    }

    await ProcessServices();
  }

  Future<void> ProcessServices() async{
    List<dynamic> _services= [];
    for (var s in services) {
      Map<String,dynamic> se = jsonDecode(s);

      if(DateTime.now().isAfter(DateTime.parse(se['end_time']))){
        continue;
      }

      try{
        var response = (await http.post(
            Uri.parse('${API_ENDPOINT}get_appointments.php'),
            body: <String, String>{
              'serviceId':se['id']
            }));

        se.putIfAbsent("appointments", () => jsonDecode(response.body.toString()));
      }catch(e){
        Debug.LogError(e);
      }

      _services.add(se);
    }
    services = _services;
  }

  Future<void> AddService(String name, DateTime sTime, DateTime eTime,Duration duration) async {
    try{
      var response = (await http.post(
      Uri.parse('${API_ENDPOINT}add_service.php'),
          body: <String, String>{
            'name':name,
            'stime':sTime.toString(),
            'etime':eTime.toString(),
            'duration':"${duration.ToHoursAndMinutes()}"
          }));
      Debug.LogResponse(response.body.toString());
      services = jsonDecode(response.body.toString());
      Debug.LogResponse(services);
    }catch(e){
      Debug.LogError(e);
    }
    await ProcessServices();

  }

  Future<void> DeleteService(String id) async {
    try{
      var response = (await http.post(
          Uri.parse('${API_ENDPOINT}remove_service.php'),
          body: <String, String>{
            'id':id,
          }));
      Debug.LogResponse(response.body.toString());
      services = jsonDecode(response.body.toString());
      Debug.LogResponse(services);
    }catch(e){
      Debug.LogError(e);
    }
    await ProcessServices();
  }

  Future<void> EditService(String id,String name, DateTime sTime, DateTime eTime,Duration duration) async {
    try{
      var response = (await http.post(
          Uri.parse('${API_ENDPOINT}edit_service.php'),
          body: <String, String>{
            'id':id,
            'name':name,
            'stime':sTime.toString(),
            'etime':eTime.toString(),
            'duration':"${duration.ToHoursAndMinutes()}"
          }));
      Debug.LogResponse(response.body.toString());
      services = jsonDecode(response.body.toString());
      Debug.LogResponse(services);
    }catch(e){
      Debug.LogError(e);
    }
    await ProcessServices();

  }

  Future<String> CompleteService(dynamic serviceId, dynamic tokenId) async {
    String res = "";
    Debug.Log("Completing $tokenId from Service $serviceId");
    try{
      var response = (await http.post(
          Uri.parse('${API_ENDPOINT}complete_token.php'),
          body: <String, String>{
            'service_id':serviceId.toString(),
            'user_id':tokenId.toString(),
          }));
      res = response.body.toString();
      Debug.LogResponse(response.body.toString());
      services = jsonDecode(response.body.toString());
      await ProcessServices();

      Debug.LogResponse(services);
      return "0";
    }catch(e){
      Debug.LogError(e);
      return res;
    }
  }

  Map<String,dynamic> GetServiceById(String id){
    for (var service in services) {
      Map<String,dynamic> s = (service);

      if(s['id']==id){
        return s;
      }
    }
    return {};
  }
}

class Helpers{
  static Duration ParseDuration(String input){
    if(input.contains(":")){
      return Duration(hours: int.parse(input.split(":")[0]), minutes:  int.parse(input.split(":")[1]));
    }

    return Duration(minutes: 0);
  }
}

extension DurationExtensions on Duration{
  String ToHoursAndMinutes(){
    int mins = this.inMinutes %60;
    return "${this.inHours}:${mins}";
  }
}