using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.WPF;
using PRSDesktop.WidgetGroups;
using Syncfusion.UI.Xaml.Charts;

namespace PRSDesktop
{
    public class UserActivityDashboardProperties : IDashboardProperties { }

    public class UserActivityDashboardElement : DashboardElement<UserActivity, WidgetGroups.System, UserActivityDashboardProperties> { }

    /// <summary>
    ///     Interaction logic for DatabaseActivityDashboard.xaml
    /// </summary>
    public partial class UserActivity : UserControl, IPanel<ModuleTracking>, IDashboardWidget<WidgetGroups.System, UserActivityDashboardProperties>
    {
        public enum HistoryView
        {
            Day,
            Week,
            Month,
            Year
        }

        private CoreTable _employees;

        private int _selected = -1;

        private readonly BitmapImage back = PRSDesktop.Resources.back.AsBitmapImage(32, 32);

        private HistoryViewModel history;
        private readonly BitmapImage next = PRSDesktop.Resources.next.AsBitmapImage(32, 32);

        public UserActivity()
        {
            InitializeComponent();

            PrevDay.Content = new Image { Source = back };
            NextDay.Content = new Image { Source = next };
        }

        public bool IsReady { get; set; }

        public void CreateToolbarButtons(IPanelHost host)
        {
        }

        public string SectionName => "User Activity";

        public UserActivityDashboardProperties Properties { get; set; }

        public DataModel DataModel(Selection selection)
        {
            return new UserActivityDataModel(history.Summary);
        }

        public void Refresh()
        {
            if (history.To == DateTime.MinValue)
                history.To = DateTime.Today;

            if (history.View == HistoryView.Day)
                CurrentDate.Text = string.Format("{0:ddd, dd MMMM yyyy}", history.To);
            else
                CurrentDate.Text = string.Format("{0:dd MMM yy} - {1:dd MMM yy}", history.From, history.To);

            // Only creating two series  active & inactive

            var colortable = typeof(Colors).GetProperties(BindingFlags.Static | BindingFlags.Public).Where(x => x.PropertyType == typeof(Color))
                .ToArray();
            Hours.Series.Clear();

            var series = new StackingColumnSeries();
            series.ItemsSource = history.Summary;
            series.XBindingPath = "Name";
            series.YBindingPath = "Active";
            series.Label = "Active";
            series.Interior = new SolidColorBrush(Colors.LightSalmon);
            series.SeriesSelectionBrush = new SolidColorBrush(Colors.Salmon);
            Hours.Series.Add(series);

            series = new StackingColumnSeries();
            series.ItemsSource = history.Summary;
            series.XBindingPath = "Name";
            series.YBindingPath = "Idle";
            series.Label = "Idle";
            series.Interior = new SolidColorBrush(Colors.LightSteelBlue);
            series.SeriesSelectionBrush = new SolidColorBrush(Colors.SteelBlue);
            Hours.Series.Add(series);

            var axis = Hours.SecondaryAxis as NumericalAxis;
            axis.Maximum = history.MaxMalue(5.0F);
        }


        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public void Setup()
        {
            history = new HistoryViewModel();

            DataContext = history;

            var grplookups = new Dictionary<Guid, string>();
            //Dictionary<Guid, String> emplookups = new Dictionary<Guid, string>() { { Guid.Empty, "All Staff" } };
            _employees = new Client<Employee>().Query(
                LookupFactory.DefineFilter<Employee>(),
                new Columns<Employee>(
                    x => x.ID,
                    x => x.UserLink.ID,
                    x => x.Name,
                    x => x.Group.ID,
                    x => x.Group.Description
                ),
                new SortOrder<Employee>(x => x.Name)
            );
            foreach (var row in _employees.Rows)
            {
                var grpid = row.Get<Employee, Guid>(x => x.Group.ID);
                var grpname = row.Get<Employee, string>(x => x.Group.Description);
                if (string.IsNullOrEmpty(grpname))
                    grpname = "(No Group Assigned)";
                if (!grplookups.ContainsKey(grpid))
                    grplookups[grpid] = grpname;

                //emplookups[row.Get<Employee, Guid>(x => x.UserLink.ID)] = row.Get<Employee, String>(x => x.Name);
            }

            var groups = grplookups.ToList();
            groups.Sort((pair1, pair2) => pair1.Value.CompareTo(pair2.Value));
            groups.Insert(0, new KeyValuePair<Guid, string>(CoreUtils.FullGuid, "All Groups"));
            GroupView.ItemsSource = groups;

            //StaffView.ItemsSource = emplookups;

            //LoadCategories(Guid.Empty);

            Hours.Legend = new ChartLegend
            {
                LegendPosition = LegendPosition.Outside,
                DockPosition = ChartDock.Right,
                FontSize = 11,
                Width = 100
                //ItemsPanel = Hours.Resources["itemPanelTemplate"] as ItemsPanelTemplate
            };
        }

        public void Shutdown()
        {
        }

        public event DataModelUpdateEvent OnUpdateDataModel;

        public void Heartbeat(TimeSpan time)
        {
            // Nothing to do here
        }

        private bool HasData(List<History> history)
        {
            foreach (var record in history)
            {
                var hasdata = record.Active + record.Idle > 0.0F;
                if (hasdata)
                    return true;
            }

            return false;
        }

        private void LoadCategories(Guid userid)
        {
            history.Categories.Clear();
            if (userid.Equals(Guid.Empty))
            {
                foreach (var row in _employees.Rows)
                    if (GroupView.SelectedValue.Equals(CoreUtils.FullGuid) ||
                        row.Get<Employee, Guid>(x => x.Group.ID).Equals(GroupView.SelectedValue))
                        history.Categories[row.Get<Employee, Guid>(x => x.UserLink.ID).ToString()] = row.Get<Employee, string>(x => x.Name);
            }
            else
            {
                foreach (var module in Modules.All.OrderBy(x => x))
                    history.Categories[module] = module;
            }
        }

        private void GroupView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (history == null)
                return;

            if (e.AddedItems.Count > 0)
            {
                var id = ((KeyValuePair<Guid, string>)e.AddedItems[0]).Key;

                var curhistory = history;
                history = null;

                var emplookups = new Dictionary<Guid, string> { { Guid.Empty, "All Staff" } };
                foreach (var row in _employees.Rows)
                {
                    var grpid = row.Get<Employee, Guid>(x => x.Group.ID);
                    if (id.Equals(CoreUtils.FullGuid) || grpid.Equals(id))
                        emplookups[row.Get<Employee, Guid>(x => x.UserLink.ID)] = row.Get<Employee, string>(x => x.Name);
                }

                StaffView.ItemsSource = null;
                history = curhistory;
                StaffView.ItemsSource = emplookups;
                if (!Guid.Empty.Equals(StaffView.SelectedValue))
                    StaffView.SelectedValue = Guid.Empty;
            }
        }

        private void StaffView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (history == null)
                return;
            if (e.AddedItems.Count > 0)
            {
                var id = ((KeyValuePair<Guid, string>)e.AddedItems[0]).Key;
                LoadCategories(id);
                history.UserID = id;
                Refresh();
                ShowAll.Width = id != Guid.Empty ? new GridLength(70) : new GridLength(0);
            }
        }

        private void ViewStyle_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (history == null)
                return;
            history.View = ViewStyle.SelectedIndex == 0 ? HistoryView.Day :
                ViewStyle.SelectedIndex == 1 ? HistoryView.Week :
                ViewStyle.SelectedIndex == 2 ? HistoryView.Month : HistoryView.Year;
            Refresh();
        }

        private void Search_KeyUp(object sender, KeyEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(Search.Text) || e.Key == Key.Return)
            {
                history.Search = Search.Text;
                Refresh();
            }
        }

        private void PrevDay_Click(object sender, RoutedEventArgs e)
        {
            history.Back();
            Refresh();
        }

        private void CurrentDate_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            history.To = DateTime.Today;
            Refresh();
        }

        private void NextDay_Click(object sender, RoutedEventArgs e)
        {
            history.Forward();
            Refresh();
        }

        private void Export_Click(object sender, RoutedEventArgs e)
        {
        }

        private void Hours_SelectionChanged(object sender, ChartSelectionChangedEventArgs e)
        {
            if (e.IsDataPointSelection)
            {
                if (history.UserID == Guid.Empty && e.SelectedIndex == -1 && _selected > -1)
                {
                    var emps = StaffView.ItemsSource as Dictionary<Guid, string>;
                    var id = emps.Keys.ElementAt(_selected + 1);
                    LoadCategories(id);
                    StaffView.SelectedValue = id;
                }

                _selected = e.SelectedIndex;
            }
        }

        private void ShowAll_Click(object sender, RoutedEventArgs e)
        {
            StaffView.SelectedValue = Guid.Empty;
        }


        // Either:
        // - Person + Time Spent on any module
        // - Module + Time Spent in Specific Module
        public class History
        {
            public string Key { get; set; }
            public string Name { get; set; }
            public double Active { get; set; }
            public double Idle { get; set; }
        }

        public class HistoryViewModel
        {
            private string _search = "";

            private DateTime _to = DateTime.MinValue;

            private Guid _userid = Guid.Empty;

            private HistoryView _view = HistoryView.Day;

            public HistoryViewModel()
            {
                Categories = new Dictionary<string, string>();
                Summary = new List<History>();
                To = DateTime.Today;
            }

            public Guid UserID
            {
                get => _userid;
                set
                {
                    _userid = value;
                    Refresh();
                }
            }

            public HistoryView View
            {
                get => _view;
                set
                {
                    _view = value;
                    Refresh();
                }
            }

            public DateTime To
            {
                get => _to.Date;
                set
                {
                    _to = value;
                    Refresh();
                }
            }

            public DateTime From => _view.Equals(HistoryView.Day) ? _to :
                _view.Equals(HistoryView.Week) ? _to.AddDays(-6) :
                _view.Equals(HistoryView.Month) ? _to.AddMonths(-1).AddDays(1) : _to.AddYears(-1).AddDays(1);

            public Dictionary<string, string> Categories { get; }

            public List<History> Summary { get; set; }

            public string Search
            {
                get => _search;
                set
                {
                    _search = value;
                    Refresh();
                }
            }

            public void Forward()
            {
                To = _view.Equals(HistoryView.Day) ? _to.AddDays(1) :
                    _view.Equals(HistoryView.Week) ? _to.AddDays(7) :
                    _view.Equals(HistoryView.Month) ? _to.AddMonths(1) : _to.AddYears(1);
            }

            public void Back()
            {
                To = _view.Equals(HistoryView.Day) ? _to.AddDays(-1) :
                    _view.Equals(HistoryView.Week) ? _to.AddDays(-7) :
                    _view.Equals(HistoryView.Month) ? _to.AddMonths(-1) : _to.AddYears(-1);
            }

            private void AddSearchCriteria(Filter<ModuleTracking> filter, string search,
                params Expression<Func<ModuleTracking, object>>[] expressions)
            {
                var comps = search.Trim().Split(' ');
                foreach (var comp in comps)
                {
                    Filter<ModuleTracking> result = null;
                    foreach (var expression in expressions)
                        result = result == null ? new Filter<ModuleTracking>(expression).Contains(comp) : result.Or(expression).Contains(comp);
                    filter.Ands.Add(result);
                }
            }

            private void UpdateHistory(CoreRow row)
            {
                var category = "";
                if (_userid.Equals(Guid.Empty))
                    category = row.Get<ModuleTracking, Guid>(x => x.User.ID).ToString();
                else
                    category = row.Get<ModuleTracking, string>(x => x.Module);

                var record = Summary.FirstOrDefault(x => x.Key.Equals(category));
                if (record != null)
                {
                    record.Active += row.Get<ModuleTracking, TimeSpan>(x => x.ActiveTime).TotalHours;
                    record.Idle += row.Get<ModuleTracking, TimeSpan>(x => x.IdleTime).TotalHours;
                }
            }

            public Filter<ModuleTracking> GetFilter()
            {
                var from = _view.Equals(HistoryView.Day) ? _to.AddDays(-1) :
                    _view.Equals(HistoryView.Week) ? _to.AddDays(-7) :
                    _view.Equals(HistoryView.Month) ? _to.AddMonths(-1) : _to.AddYears(-1);

                var criteria = new Filter<ModuleTracking>(x => x.Date).IsGreaterThan(from).And(x => x.Date).IsLessThanOrEqualTo(_to);
                if (!_userid.Equals(Guid.Empty))
                    criteria = criteria.And(x => x.User.ID).IsEqualTo(_userid);

                if (!string.IsNullOrWhiteSpace(_search))
                    criteria = criteria.TextSearch(
                        Search,
                        x => x.User.UserID,
                        x => x.Module
                    );
                return criteria;
            }

            private void Refresh()
            {
                var criteria = GetFilter();

                var data = new Client<ModuleTracking>().Query(
                    criteria,
                    null,
                    new SortOrder<ModuleTracking>(x => x.User.UserID)
                );

                Summary.Clear();
                foreach (var key in Categories.Keys)
                    Summary.Add(new History { Key = key, Name = Categories[key] });
                foreach (var row in data.Rows) UpdateHistory(row);
            }

            public double MaxMalue(double min)
            {
                var result = min;
                foreach (var history in Summary)
                    if (history.Active + history.Idle > result)
                        result = history.Active + history.Idle;
                return Math.Truncate(result + 1.0F);
            }
        }
    }
}