ilyalehchylin/educats-xamarin

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using EduCATS.Data;
using EduCATS.Data.Models;
using EduCATS.Helpers.Forms;
using EduCATS.Helpers.Logs;
using EduCATS.Pages.Pickers;
using EduCATS.Pages.Statistics.Enums;
using EduCATS.Pages.Statistics.Students.Models;
using EduCATS.Pages.Statistics.Students.ViewModels;
using Nyxbull.Plugins.CrossLocalization;
using Xamarin.Forms;


namespace EduCATS.Pages.Parental.Statistics.ViewsModels
{
    class ParentalStudentsPageViewModel : StudentsPageViewModel
    {

        public ParentalStudentsPageViewModel(IPlatformServices services, int subjectId,List<StatsStudentModel> studentsList, int pageIndex) : base(services,subjectId, studentsList, pageIndex)
        {
        }

        public override void Init()
        {
            CurrentGroup = new GroupItemModel() { GroupId = _service.Preferences.GroupId, GroupName = _service.Preferences.GroupName };

            setStudents(_studentsList);

            Task.Run(async () =>
            {
                if (_studentsList == null || _studentsList.Count == 0)
                {
                    await update();
                }
            });

            GroupChanged += async (id, name) => await update();

        }
    
        protected override async Task update(bool groupsOnly = false)
        {
            try
            {
                await getAndSetStudents();
            }
            catch (Exception ex)
            {
                AppLogs.Log(ex);
            }
        }

        protected override async Task getAndSetStudents()
        {
            PlatformServices.Device.MainThread(() => PlatformServices.Dialogs.ShowLoading());
            IsLoading = false;
            var studentsStatistics = await getStatistics();
            setStudents(studentsStatistics);
            PlatformServices.Device.MainThread(() => PlatformServices.Dialogs.HideLoading());
        }

        protected override async Task<List<StatsStudentModel>> getStatistics()
        {
            if (CurrentGroup == null)
            {
                return null;
            }

            var statisticsModel = await DataAccess.GetStatistics(SubjectId, CurrentGroup.GroupId);

            if (DataAccess.IsError && !DataAccess.IsConnectionError)
            {
                _service.Dialogs.ShowError(DataAccess.ErrorMessage);
            }

            return statisticsModel?.Students?.ToList();
        }
    }
}