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

namespace comal.timesheets
{

    public enum AssignmentView
    {
        Day,
        TimeLine
    }

    public enum AssignmentLookupType
    {
        ActiveJobs,
        UnbookedJobs,
        Tasks
    }
    
    public partial class AssignmentList : ContentPage
    {

        private AssignmentEdit _editor = null;

        private Guid[] _employeeids = new Guid[] { };
        
        private AssignmentModuleSettings _settings = null;

        private AssignmentView _view = AssignmentView.Day;

        private AssignmentLookupType _lookuptype = AssignmentLookupType.UnbookedJobs;

        private String _teamname = "";

        private AssignmentJobDataModel _jobs = null;
        private AssignmentKanbanDataModel _kanbans = null;

        public AssignmentList()
        {
            InitializeComponent();
            _settings = new LocalConfiguration<AssignmentModuleSettings>().Load();

            _jobs = new AssignmentJobDataModel();
            _kanbans = new AssignmentKanbanDataModel();
            
            DatePicker.Date = _settings.Date.IsEmpty() ? DateTime.Today : _settings.Date;
            
            _view = _settings.View;
            
            _employeeids = (_settings.Employees != null)
                ? _settings.Employees
                : new Guid[] { App.Data.Employee.ID };

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

            _teamname = _settings.TeamName;

        }
        
        protected override void OnAppearing()
        {
            base.OnAppearing();
            RefreshLookups();
            Reload();
        }
        
        private void RefreshLookups()
        {
            if (_lookuptype == AssignmentLookupType.Tasks)
            {
                _kanbans.Load(
                    new Filter<Kanban>(x=>x.Completed).IsEqualTo(DateTime.MinValue),
                    () => Dispatcher.BeginInvokeOnMainThread(() =>
                    {
                        Lookups.ItemsSource = new ObservableCollection<AssignmentKanbanItem>(_kanbans.Items);
                    }));
            }
            else if (_lookuptype == AssignmentLookupType.ActiveJobs)
            {
                _jobs.Load(
                    new Filter<Job>(x=>x.JobStatus.Active).IsEqualTo(true),
                    () => Dispatcher.BeginInvokeOnMainThread(() =>
                    {
                        Lookups.ItemsSource = new ObservableCollection<AssignmentJobItem>(_jobs.Items);
                    }));               
            }
            else if (_lookuptype == AssignmentLookupType.UnbookedJobs)
            {
                _jobs.Load(
                    new Filter<Job>(x=>x.JobStatus.Active).IsEqualTo(true)
                        .And(x=>x.OpenAssignments).IsEqualTo(0),
                    () => Dispatcher.BeginInvokeOnMainThread(() =>
                    {
                        Lookups.ItemsSource = new ObservableCollection<AssignmentJobItem>(_jobs.Items);
                    }));                 
            }            
        }
        
        private void Reload()
        {

            DayView.DataSource = null;         
            TimeLineView.DataSource = null;    
            
            ScheduleType.Text = _teamname;
            
            if (_view == AssignmentView.Day)
            {
                DayViewColumn.Width = new GridLength(1, GridUnitType.Star);
                TimeLineViewColumn.Width = new GridLength(0, GridUnitType.Absolute);
                DayView.DayViewSettings.DayLabelSettings.TimeFormat = "HH:mm";
            }
            else
            {
                DayViewColumn.Width = new GridLength(0, GridUnitType.Absolute);
                TimeLineViewColumn.Width = new GridLength(1, GridUnitType.Star);

                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 empname = GlobalVariables.EmployeeShells.FirstOrDefault(x => x.ID == empid)?.Name ?? 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;
                


            }
            Refresh();
        }
        
        private void Refresh()
        {
            Title.Text = $"{DatePicker.Date:dd MMMM yyyy}";
            
            DataModel.Load(
                new Filter<Assignment>(x => x.Date).IsEqualTo(DatePicker.Date).And(x => x.EmployeeLink.ID).InList(_employeeids),
                () =>
                {
                    Dispatcher.BeginInvokeOnMainThread(() =>{
                        if (_view == AssignmentView.Day)
                            DayView.DataSource = new ObservableCollection<AssignmentListDataModelItem>(DataModel.Items);
                        else
                            TimeLineView.DataSource = new ObservableCollection<AssignmentListDataModelItem>(DataModel.Items);
                    });

                }
            );

       }
        
        private void SelectedDate_Tapped(object sender, EventArgs e)
        {
            DatePicker.Focus();
        }

        private void DatePicker_OnDateSelected(object sender, DateChangedEventArgs e)
        {
            if (_employeeids.Any())
            {
                _settings.Date = DatePicker.Date;
                new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            }
            DayView.MoveToDate = DatePicker.Date;
            TimeLineView.MoveToDate = DatePicker.Date;
            Dispatcher.BeginInvokeOnMainThread(()=>
            {
                Refresh();
            });
        }

        private async void SelectEmployees_Tapped(object sender, EventArgs e)
        {

            var actions = new List<string>() { "Only Me" };
            //actions.AddRange(GlobalVariables.TeamEmployeeShells.Where(x=>x.ID == App.Data.Employee.ID).Select(x=>x.TeamName).Distinct());
            actions.AddRange(GlobalVariables.TeamEmployeeShells.Select(x=>x.TeamName).Distinct());

            var result = await MaterialDialog.Instance.SelectActionAsync(title: "Select a Team", 
                actions: actions);

            if (result == 0)
            {
                _view = AssignmentView.Day;
                _employeeids = new Guid[] { App.Data.Employee.ID };
                _teamname = App.Data.Employee.Name;
            }
            else if (result > 0)
            {
                _view = AssignmentView.TimeLine;
                _employeeids = GlobalVariables.TeamEmployeeShells.Where(x => String.Equals(x.TeamName, actions[result]))
                    .Select(x => x.ID).Distinct().ToArray();
                _teamname = actions[result];
            }

            _settings.Employees = _employeeids;
            _settings.View = _view;
            _settings.TeamName = _teamname;
            new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            
            Dispatcher.BeginInvokeOnMainThread(()=>
            {
                Reload();
            });
        }
        
        private void Lookups_OnItemTapped(object sender, ItemTappedEventArgs e)
        {
            if (e.Item is AssignmentLookupItem lookup)
            {
                if (lookup.Selected)
                    lookup.Selected = false;
                else
                {
                    IList<AssignmentLookupItem> lookups = _lookuptype == AssignmentLookupType.Tasks
                        ? _kanbans.Items.ToArray<AssignmentLookupItem>()
                        : _jobs.Items.ToArray<AssignmentLookupItem>();
                    {
                        foreach (var other in lookups.Where(x => x.Selected).ToArray())
                            other.Selected = false;
                    }
                    lookup.Selected = true;
                }
            }
        }

        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();
        }
        
        private async void Schedule_OnCellTapped(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment is AssignmentListDataModelItem item)
            {
                var editor = new AssignmentEdit(item);
                Navigation.PushAsync(editor);
            }
        }
        
        private async void Schedule_OnCellLongPressed(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment == null)
            {

                if (InABox.Core.Security.CanEdit<Assignment>())
                {
                    CreateAssignment(
                        e.Datetime,
                        e.Resource as ScheduleResource
                    );
                }
            }
            else if (InABox.Core.Security.CanDelete<Assignment>() 
                     && e.Appointment is AssignmentListDataModelItem assignment)
            {
                await DeleteAssignment(assignment.Id);
            }
        }

        private void CreateAssignment(DateTime date, ScheduleResource resource)
        {           
            var assignment = new Assignment()
            {
                Date = date.Date,
                Title = "New Assignment",
            };
            assignment.Booked.Start = new TimeSpan(date.TimeOfDay.Hours, 0, 0);
            assignment.Booked.Finish = date.TimeOfDay.Add(new TimeSpan(1, 0, 0));
            assignment.Booked.Duration = new TimeSpan(1, 0, 0);

            assignment.EmployeeLink.ID = (resource is ScheduleResource sr)
                ? (Guid)sr.Id
                : App.Data.Employee.ID;
            
            var job = (_lookuptype == AssignmentLookupType.ActiveJobs) || (_lookuptype == AssignmentLookupType.UnbookedJobs)
                ? _jobs.Items.FirstOrDefault(x => x.Selected)
                : null;
            if (job != null)
            {
                assignment.JobLink.ID = job.Id;
                assignment.JobLink.JobNumber = job.Number;
                assignment.JobLink.Name = job.Name;
                assignment.Description = job.Description;
                assignment.Title = job.Name;
                job.Selected = false;
            }
            
            var task = _lookuptype == AssignmentLookupType.Tasks
                ? _kanbans.Items.FirstOrDefault(x => x.Selected)
                : null;  
            if (task != null)
            {
                assignment.Task.ID = task.Id;
                assignment.Task.Number = int.Parse(task.Number);
                assignment.Task.Title = task.Name;
                assignment.Title = task.Name;
                assignment.Description = task.Description;
                task.Selected = false;
            }            
            
            var editor = new AssignmentEdit(assignment);
            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");
                }

                Refresh();
            }
        }

    }
}