using System;
using System.Collections;
using System.Collections.ObjectModel;
using InABox.Clients;
using InABox.Core;
using Comal.Classes;
using Xamarin.Forms;
using System.Linq;
using System.Threading.Tasks;
using InABox.Configuration;
using InABox.Mobile;
using Syncfusion.SfSchedule.XForms;
using XF.Material.Forms;
using XF.Material.Forms.UI.Dialogs;
using XF.Material.Forms.UI.Dialogs.Configurations;

namespace PRS.Mobile
{

    public enum AssignmentViewType
    {
        Day,
        TimeLine
    }

    public enum AssignmentLookupType
    {
        ActiveJobs,
        UnbookedJobs,
        Tasks
    }
    
    public class SelectedColorConverter : AbstractConverter<ILookupShell, Color>
    {
        public Color SelectedColor { get; set; }
        public Color UnselectedColor { get; set; }
        
        protected override Color Convert(ILookupShell value, object? parameter = null)
        {
            return (value?.Parent as ICoreRepository)?.IsSelected(value) == true
                ? SelectedColor
                : UnselectedColor;
        }
    }

    public partial class AssignmentList
    {
        private AssignmentModel DataModel { get; set; }

        private Guid[] _employeeids;

        private readonly AssignmentModuleSettings _settings;

        private AssignmentViewType _view;

        private AssignmentLookupType _lookuptype;

        private String _teamname;
        private DateTime _currentdate;

        public AssignmentList()
        {
            InitializeComponent();
            
            DataModel = new AssignmentModel(App.Data, GetFilter);

            BindingContext = DataModel;
            
            _settings = new LocalConfiguration<AssignmentModuleSettings>().Load();

            _currentdate = _settings.Date.IsEmpty() ? DateTime.Today : _settings.Date;

            _view = _settings.View;

            _employeeids = _settings.Employees ?? new[] { App.Data.Me.ID };

            _lookuptype = _settings.LookupType;
            LookupType.Text = CoreUtils.Neatify(_lookuptype.ToString());

            _teamname = String.IsNullOrWhiteSpace(_settings.TeamName) ? App.Data.Me.Name : _settings.TeamName;
            
            ShowHideSources.IsVisible = Security.IsAllowed<CanViewMobileAssignmentsSidebar>();
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            Task[] tasks = new Task[]
            {
                Task.Run(() => App.Data.Employees.Refresh(false)),
                Task.Run(() => App.Data.Jobs.Refresh(false)),
            };
            Task.WaitAll(tasks);
            
            RefreshLookups();
            
            Reload();
        }
        
        private void RefreshLookups(bool reset = false)
        {
            var items = _lookuptype switch
            {
                AssignmentLookupType.Tasks => App.Data.Kanbans,
                AssignmentLookupType.ActiveJobs => App.Data.Jobs.Search(x => true),
                _ => App.Data.Jobs.Search(x => x.OpenAssignments == 0)
            };
            if (reset)
                items.SelectNone();
            Device.BeginInvokeOnMainThread(() =>
            {
                Lookups.ItemsSource = null;
                Lookups.ItemsSource = items.Items;
            });
        }

        private void Reload()
        {

            DayView.DataSource = null;
            TimeLineView.DataSource = null;

            ScheduleType.Text = _teamname;

            if (_view == AssignmentViewType.Day)
            {
                TimelineFrame.IsVisible = false;
                DayFrame.IsVisible = true;
                DayView.DayViewSettings.DayLabelSettings.TimeFormat = "HH:mm";
            }
            else
            {

                DayFrame.IsVisible = false;
                TimelineFrame.IsVisible = true;
                
                TimeLineView.ResourceViewSettings.VisibleResourceCount = Math.Max(1, Math.Min(16, _employeeids.Length));
                TimeLineView.TimelineViewSettings.AppointmentHeight =
                    (this.Height / TimeLineView.ResourceViewSettings.VisibleResourceCount) + 100;

                var resources = new ObservableCollection<object>();
                foreach (var empid in _employeeids)
                {
                    var emp = App.Data.Employees.Items.FirstOrDefault(x => x.ID == empid);
                    var empname = emp?.Name ?? emp?.Code ?? empid.ToString();
                    if (_employeeids.Length > 10)
                        empname = String.Join("", empname.Split(' ').Select(x => x.Substring(0, 1)));
                    else if (_employeeids.Length > 6)
                    {
                        var comps = empname.Split(' ').ToArray();
                        empname = $"{comps.First()} {String.Join("", comps.Skip(1).Select(x => x.Substring(0, 1)))}";
                    }

                    resources.Add(
                        new ScheduleResource()
                        {
                            Name = empname,
                            Id = empid,
                            Color = Color.Transparent,
                            Image = ""
                        }
                    );
                }
                TimeLineView.ScheduleResources = resources;
                TimeLineView.ShowResourceView = true;
                
            }
            RefreshData();
        }

        private Filter<Assignment> GetFilter() =>
            new Filter<Assignment>(x => x.Date).IsEqualTo(_currentdate)
                .And(x => x.EmployeeLink.ID).InList(_employeeids);

        private void RefreshData()
        {
            DataModel.Refresh(true, () => Device.BeginInvokeOnMainThread(UpdateScreen));
        }

        private void UpdateScreen()
        {
            Title = $"{_currentdate:dd MMMM yyyy}";
            if (_view == AssignmentViewType.Day)
            {
                DayView.DataSource = new ObservableCollection<AssignmentShell>(DataModel.Items);
                DayView.MoveToDate = ShowRelevantTime();
            }
            else
            {
                TimeLineView.DataSource = new ObservableCollection<AssignmentShell>(DataModel.Items);
                TimeLineView.MoveToDate = ShowRelevantTime();
            }
        }

        private DateTime ShowRelevantTime()
        {
            return (DataModel.Items.Count > 0 ? DataModel.Items.First().StartTime : DateTime.Now).AddMinutes(-30);
        }


        
        private void Lookups_OnItemTapped(object sender, ItemTappedEventArgs e)
        {

        }
        
        private void Lookups_Clicked(object sender, EventArgs e)
        {
            var item = (sender as MobileCard)?.BindingContext;
            ICoreRepository model = _lookuptype == AssignmentLookupType.Tasks
                ? App.Data.Kanbans
                : App.Data.Jobs as ICoreRepository;
            model.SelectNone();
            model.SelectItem(item);
        }

        private void LookupsType_Tapped(object sender, EventArgs e)
        {
            _lookuptype = _lookuptype == AssignmentLookupType.Tasks
                ? AssignmentLookupType.ActiveJobs
                : _lookuptype == AssignmentLookupType.ActiveJobs
                    ? AssignmentLookupType.UnbookedJobs
                    : AssignmentLookupType.Tasks;
            _settings.LookupType = _lookuptype;
            LookupType.Text = CoreUtils.Neatify(_lookuptype.ToString());
            new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            RefreshLookups(true);
        }

        private void Schedule_OnCellTapped(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment is AssignmentShell item)
            {
                if (item.DeliveryID != Guid.Empty)
                {
                    ProgressVisible = true;
                    DeliveryEdit editor = null;
                    Task.Run(() => { editor = DeliveryEdit.Load(item.DeliveryID); }).Wait();
                    ProgressVisible = false;
                    if (editor != null)
                        Navigation.PushAsync(editor);
                    else
                        DisplayAlert("Error", "Cannot Load Delivery!", "OK");
                }
                else
                {
                    var editor = new AssignmentEdit(){ Item = item };
                    Navigation.PushAsync(editor);
                }
            }
        }

        private async void Schedule_OnCellLongPressed(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment == null)
            {
                if (Security.CanEdit<Assignment>())
                {
                    CreateAssignment(
                        e.Datetime,
                        e.Resource as ScheduleResource
                    );
                }
            }
            else if (Security.CanDelete<Assignment>()
                     && e.Appointment is AssignmentShell assignment)
            {
                await DeleteAssignment(assignment.ID);
            }
        }

        private void CreateAssignment(DateTime date, ScheduleResource resource)
        {
            var shell = DataModel.AddItem();


            shell.Date = date.Date;
            shell.Title = "New Assignment";
            
            shell.BookedStart = new TimeSpan(date.TimeOfDay.Hours, 0, 0);
            shell.BookedFinish = date.TimeOfDay.Add(new TimeSpan(1, 0, 0));
            shell.BookedDuration = new TimeSpan(1, 0, 0);

            shell.EmployeeID = (resource is { } sr)
                ? (Guid)sr.Id
                : App.Data.Me.ID;

            var job = (_lookuptype == AssignmentLookupType.ActiveJobs) || (_lookuptype == AssignmentLookupType.UnbookedJobs)
                ? App.Data.Jobs.SelectedItems.FirstOrDefault()
                : null;
            if (job != null)
            {
                shell.JobID = job.ID;
                shell.JobNumber = job.JobNumber;
                shell.JobName = job.Name;
                shell.Description = String.Join("\n",job.Notes);
                shell.Title = job.DisplayName;
            }

            var task = _lookuptype == AssignmentLookupType.Tasks
                ? App.Data.Kanbans.SelectedItems.FirstOrDefault()
                : null;
            if (task != null)
            {
                shell.TaskID = task.ID;
                shell.TaskNumber = task.Number;
                shell.TaskName = task.Description;
                shell.Title = task.Title;
                shell.Description = task.Description;
                App.Data.Kanbans.SelectNone();
            }

            var editor = new AssignmentEdit() { Item = shell };
            Navigation.PushAsync(editor);
        }

        private async Task DeleteAssignment(Guid id)
        {
            var confirm = await MaterialDialog.Instance.ConfirmAsync(
                "Are you sure you wish to delete this assignment?",
                "Confirm Deletion",
                "Yes, Delete",
                "Cancel",
                new MaterialAlertDialogConfiguration()
                {
                    ButtonFontFamily = Material.FontFamily.Body2
                }
            );
            if (confirm == true)
            {
                using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Deleting Assignment"))
                {
                    var assignment = new Assignment() { ID = id };
                    new Client<Assignment>().Delete(assignment, "Deleted on Mobile Device");
                }

                RefreshData();
            }
        }

        private void SelectDate_OnClicked(object sender, EventArgs e)
        {
            var selector = new MobileDateSelector();
            selector.Date = _currentdate;
            selector.Changed += (o, args) =>
            {
                ChangeDate(args.Date);
                DismissPopup();
            };
            ShowPopup(() => selector);

        }

        private void ChangeDate(DateTime date)
        {
            if (_employeeids.Any())
            {
                _currentdate = date;
                _settings.Date = date;
                new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            }
            DayView.MoveToDate = date;
            TimeLineView.MoveToDate = date;
            RefreshData();
        }

        private void SelectEmployees_OnClicked(object sender, EventArgs e)
        {
            ShowPopup(() => CreateTeamSelection("Select Employees", (team) =>
            {
                if (team == null)
                {
                    _view = AssignmentViewType.Day;
                    _employeeids = new[] { App.Data.Me.ID };
                    _teamname = App.Data.Me.Name;
                }
                else
                {
                    _view = AssignmentViewType.TimeLine;
                    _employeeids = App.Data.EmployeeTeams.Where(x => x.TeamID == team.ID)
                        .Select(x => x.ID).Distinct().ToArray();
                    _teamname = team.Name;
                }
                
                _settings.Employees = _employeeids;
                _settings.View = _view;
                _settings.TeamName = _teamname;
                new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
                
                Dispatcher.BeginInvokeOnMainThread(Reload);
            }));
        }
        
        private View CreateTeamSelection(String caption, Action<EmployeeTeamSummary> selected)
        {
            SelectionView selection = new SelectionView
            {
                VerticalOptions = LayoutOptions.Fill,
                HorizontalOptions = LayoutOptions.Fill
            };
            selection.Configure += (sender, args) =>
            {
                args.Columns
                    .BeginUpdate()
                    .Clear()
                    .Add(new MobileGridTextColumn<EmployeeTeamSummary>() { Column = x=>x.Name, Width = GridLength.Star, Caption = caption, Alignment = TextAlignment.Start})
                    .EndUpdate();
            };
            selection.Refresh += (sender, args) =>
            {
                App.Data.EmployeeTeams.Refresh(false);
                return App.Data.EmployeeTeams.AvailableTeams;
            };
            selection.SelectionChanged += (sender, args) =>
            {
                selected(args.SelectedItems.FirstOrDefault() as EmployeeTeamSummary);
                DismissPopup();
            };
            selection.AddButton("Only Me", () =>
            {
                selected(null);
                DismissPopup();
            });
            selection.Load();
            return selection;
        }
        
        private bool _sidebarvisible;
        
        private void ShowHideSources_OnClicked(object sender, EventArgs e)
        {
            _sidebarvisible = !_sidebarvisible;
            ShowHideSources.Source = _sidebarvisible
                ? ImageSource.FromFile("arrow_white_right")
                : ImageSource.FromFile("arrow_white_down");
            JobColumn.Width = _sidebarvisible
                ? new GridLength(150, GridUnitType.Absolute)
                : new GridLength(0, GridUnitType.Absolute);
        }

        private void NextDay_OnClicked(object sender, MobileButtonClickEventArgs args)
        {
            ChangeDate(_currentdate.AddDays(1));
        }

        private void PrevDay_OnClicked(object sender, MobileButtonClickEventArgs args)
        {
            ChangeDate(_currentdate.AddDays(-1));
        }


    }
}