using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.WPF;
using java.nio.file;
using Syncfusion.Data.Extensions;
using Syncfusion.UI.Xaml.Charts;
using Syncfusion.Windows.Controls.Gantt.Chart;
using Syncfusion.Windows.Tools.Controls;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reactive.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using InABox.Configuration;

namespace PRSDesktop
{
    public class JobDocumentItemViewModel
    {
        public string Group { get; set; }

        public string MileStoneCode { get; set; }

        public JobDocumentStatusChart.StatusType Status { get; set; }

        public int Count { get; set; }

        public SolidColorBrush Colour { get; set; }
    }

    public class JobDocumentStatusChartProperties : IUserConfigurationSettings, IDashboardProperties
    {
        public JobDocumentStatusChart.ItemType ItemType { get; set; } = JobDocumentStatusChart.ItemType.Sets;

        public JobDocumentStatusChart.StatusType[]? StatusTypes { get; set; } = null;

        public Guid[] MileStones { get; set; } = Array.Empty<Guid>();

        public Guid JobID { get; set; }
    }

    public class JobDocumentStatusChartElement : DashboardElement<JobDocumentStatusChart, WidgetGroups.Projects, JobDocumentStatusChartProperties> { }

    /// <summary>
    /// Interaction logic for JobDocumentStatusChart.xaml
    /// </summary>
    public partial class JobDocumentStatusChart : UserControl,
        IDashboardWidget<WidgetGroups.Projects, JobDocumentStatusChartProperties>,
        IRequiresCanView<JobDocumentSetMileStone>,
        IHeaderDashboard
    {
        private Dictionary<Guid, Color> MileStoneColours { get; set; }

        private Dictionary<Guid, JobDocumentSetMileStoneType> MilestoneTypes { get; set; }
        private List<KeyValuePair<Guid, string>> JobLookups { get; set; }

        public JobDocumentStatusChartProperties Properties { get; set; }
        public event LoadSettings<JobDocumentStatusChartProperties>? LoadSettings;
        public event SaveSettings<JobDocumentStatusChartProperties>? SaveSettings;

        public DashboardHeader Header { get; } = new();

        public enum ItemType
        {
            Sets,
            Documents
        }

        public enum StatusType
        {
            Failed,
            Incomplete,
            Submitted,
            Approved
        }

        public JobDocumentStatusChart()
        {
            InitializeComponent();
        }

        public void Setup()
        {
            JobLookups = new Client<Job>()
                .Query(null,
                    LookupFactory.DefineColumns<Job>())
                .Rows.Select(x => new KeyValuePair<Guid, string>(
                    (Guid?)x["ID"] ?? Guid.Empty,
                    LookupFactory.FormatLookup<Job>(x.ToDictionary(new[] { "ID" }), Array.Empty<string>())))
                .ToList();
            JobLookups.Insert(0, new(Guid.Empty, "Select Job"));

            var pallete = new ChartColorModel().GetMetroBrushes()
                .Select(x => (x as SolidColorBrush)?.Color)
                .Where(x => x != null)
                .Select(x => x!.Value).ToList();

            MilestoneTypes = new Client<JobDocumentSetMileStoneType>()
                .Query(null,
                    new Columns<JobDocumentSetMileStoneType>(x => x.ID)
                        .Add(x => x.Code)
                        .Add(x => x.Description))
                .ToObjects<JobDocumentSetMileStoneType>().ToDictionary(x => x.ID, x => x);

            int i = 0;
            MileStoneColours = MilestoneTypes.ToDictionary(x => x.Key, x => pallete[i++ % pallete.Count]);

            SetupHeader();
        }

        #region Header

        private ComboBox JobBox;
        private ComboBox ItemTypeBox;
        private ComboBoxAdv MilestoneBox;
        private ComboBoxAdv StatusTypeBox;

        private void SetupHeader()
        {
            JobBox = new ComboBox
            {
                Margin = new Thickness(5, 0, 0, 0)
            };
            JobBox.ItemsSource = JobLookups;
            JobBox.SelectedValuePath = "Key";
            JobBox.DisplayMemberPath = "Value";
            JobBox.SelectedValue = Properties.JobID;
            JobBox.SelectionChanged += JobBox_SelectionChanged;

            ItemTypeBox = new ComboBox
            {
                Margin = new Thickness(5, 0, 0, 0)
            };
            ItemTypeBox.ItemsSource = Enum.GetValues<ItemType>();
            ItemTypeBox.SelectedValue = Properties.ItemType;
            ItemTypeBox.SelectionChanged += ItemTypeBox_SelectionChanged;

            MilestoneBox = new ComboBoxAdv
            {
                VerticalAlignment = VerticalAlignment.Stretch,
                VerticalContentAlignment = VerticalAlignment.Center,
                IsEditable = false,
                AllowMultiSelect = true,
                Width = 150,
                DefaultText = "Select Milestones",

                Margin = new Thickness(5, 0, 0, 0)
            };

            var items = MilestoneTypes.ToDictionary(x => x.Key, x => $"{x.Value.Code}: {x.Value.Description}");
            MilestoneBox.ItemsSource = items;
            MilestoneBox.SelectedValuePath = "Key";
            MilestoneBox.DisplayMemberPath = "Value";
            MilestoneBox.SelectedItems = Properties.MileStones.Select(x => items.Where(y => x == y.Key).FirstOrDefault()).ToObservableCollection();
            MilestoneBox.SelectionChanged += MileStoneBox_SelectionChanged;

            StatusTypeBox = new ComboBoxAdv
            {
                VerticalAlignment = VerticalAlignment.Stretch,
                VerticalContentAlignment = VerticalAlignment.Center,
                IsEditable = false,
                AllowMultiSelect = true,
                Width = 150,
                DefaultText = "Select Status",

                Margin = new Thickness(5, 0, 0, 0)
            };
            StatusTypeBox.ItemsSource = Enum.GetValues<StatusType>();
            StatusTypeBox.SelectedItems = GetStatusTypes().ToObservableCollection();
            StatusTypeBox.SelectionChanged += StatusTypeBox_SelectionChanged;

            Header.BeginUpdate()
                .Add(JobBox)
                .Add(ItemTypeBox)
                .Add(StatusTypeBox)
                .Add(MilestoneBox)
                .EndUpdate();
        }

        private void MileStoneBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Properties.MileStones = MilestoneBox.SelectedItems.Cast<KeyValuePair<Guid, string>>().Select(x => x.Key).ToArray();
            Refresh();
        }

        private void JobBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Properties.JobID = (Guid)JobBox.SelectedValue;
            Refresh();
        }

        private void ItemTypeBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Properties.ItemType = (ItemType)ItemTypeBox.SelectedValue;
            Refresh();
        }

        private void StatusTypeBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Properties.StatusTypes = StatusTypeBox.SelectedItems.Cast<StatusType>().OrderBy(x => x).ToArray();
            Refresh();
        }

        #endregion

        private void ClearView(string message = "No Data")
        {
            NoDataLabel.Content = message;

            Pie.Visibility = Visibility.Collapsed;

            ChartRow.Height = new GridLength(0);
            LabelRow.Height = new GridLength(1, GridUnitType.Star);
        }
        private void ShowView()
        {
            Pie.Visibility = Visibility.Visible;

            ChartRow.Height = new GridLength(1, GridUnitType.Star);
            LabelRow.Height = new GridLength(0);
        }

        private StatusType[] GetStatusTypes()
        {
            Properties.StatusTypes ??= Enum.GetValues<StatusType>().OrderBy(x => x).ToArray();
            return Properties.StatusTypes;
        }

        private StatusType ConvertStatus(JobDocumentSetMileStoneStatus status)
        {
            switch (status)
            {
                case JobDocumentSetMileStoneStatus.Approved:
                    return StatusType.Approved;
                case JobDocumentSetMileStoneStatus.Submitted:
                    return StatusType.Submitted;
                case JobDocumentSetMileStoneStatus.Rejected:
                case JobDocumentSetMileStoneStatus.Cancelled:
                    return StatusType.Failed;
                case JobDocumentSetMileStoneStatus.NotStarted:
                case JobDocumentSetMileStoneStatus.InProgress:
                case JobDocumentSetMileStoneStatus.OnHold:
                case JobDocumentSetMileStoneStatus.InfoRequired:
                case JobDocumentSetMileStoneStatus.Unknown:
                default:
                    return StatusType.Incomplete;
            }
        }

        private Filter<JobDocumentSetMileStone> GetStatusFilter()
        {
            var statusTypes = GetStatusTypes();

            if (statusTypes.Length == 0)
                return new Filter<JobDocumentSetMileStone>().All();

            var statuses = new List<JobDocumentSetMileStoneStatus>();
            if (statusTypes.Contains(StatusType.Incomplete))
            {
                statuses.Add(JobDocumentSetMileStoneStatus.NotStarted);
                statuses.Add(JobDocumentSetMileStoneStatus.InProgress);
                statuses.Add(JobDocumentSetMileStoneStatus.OnHold);
                statuses.Add(JobDocumentSetMileStoneStatus.InfoRequired);
                statuses.Add(JobDocumentSetMileStoneStatus.Unknown);
            }
            if (statusTypes.Contains(StatusType.Approved))
            {
                statuses.Add(JobDocumentSetMileStoneStatus.Approved);
            }
            if (statusTypes.Contains(StatusType.Submitted))
            {
                statuses.Add(JobDocumentSetMileStoneStatus.Submitted);
            }
            if (statusTypes.Contains(StatusType.Failed))
            {
                statuses.Add(JobDocumentSetMileStoneStatus.Rejected);
                statuses.Add(JobDocumentSetMileStoneStatus.Cancelled);
            }

            if (statuses.Count == 0)
                return new Filter<JobDocumentSetMileStone>().None();

            //return new Filter<JobDocumentSetMileStone>(x => x.Status).InList(statuses.ToArray());
            var filter = new Filter<JobDocumentSetMileStone>(x => x.Status).IsEqualTo(statuses[0]);
            for(int i = 1; i < statuses.Count; ++i)
            {
                filter.Or(x => x.Status).IsEqualTo(statuses[i]);
            }
            return filter;
        }

        private Filter<JobDocumentSetMileStone> GetMileStoneFilter()
        {
            if (Properties.MileStones.Length == 0)
                return new Filter<JobDocumentSetMileStone>().All();
            return new Filter<JobDocumentSetMileStone>(x => x.Type.ID).InList(Properties.MileStones);
        }

        public void Refresh()
        {
            if (Properties.JobID == Guid.Empty)
            {
                ClearView("Please select a Job");
                return;
            }

            var statusFilter = GetStatusFilter();
            var milestoneFilter = GetMileStoneFilter();
            var columns = new Columns<JobDocumentSetMileStone>(x => x.ID)
                .Add(x => x.Type.ID)
                .Add(x => x.Status);

            if (Properties.ItemType == ItemType.Documents)
            {
                columns.Add(x => x.Attachments);
            }

            var milestones = new Client<JobDocumentSetMileStone>()
                .Query(
                    new Filter<JobDocumentSetMileStone>(x => x.DocumentSet.Job.ID).IsEqualTo(Properties.JobID)
                        .And(statusFilter)
                        .And(milestoneFilter),
                    columns);
            if (!milestones.Rows.Any())
            {
                ClearView();
                return;
            }

            var grouping = milestones
                .ToObjects<JobDocumentSetMileStone>()
                .GroupBy(x => new { x.Type.ID, Status = ConvertStatus(x.Status) })
                .OrderBy(x => x.Key.ID).ThenBy(x => x.Key.Status);

            var statusTypes = GetStatusTypes();
            if (statusTypes.Length == 0)
                statusTypes = Enum.GetValues<StatusType>();

            float i = 0f;
            var statusShades = statusTypes.ToDictionary(x => x, x => -0.5f + (++i / statusTypes.Length) * 0.5f);

            var data = grouping.Select(x =>
            {
                if (!MilestoneTypes.TryGetValue(x.Key.ID, out var milestoneType)) return null;
                if (!MileStoneColours.TryGetValue(x.Key.ID, out var milestoneColour)) return null;

                return new JobDocumentItemViewModel
                {
                    Group = $"{milestoneType.Code} : {x.Key.Status}",
                    Count = Properties.ItemType == ItemType.Documents ? x.Sum(x => x.Attachments) : x.Count(),
                    MileStoneCode = milestoneType.Code,
                    Status = x.Key.Status,
                    Colour = new SolidColorBrush(ImageUtils.AdjustBrightness(milestoneColour, statusShades[x.Key.Status]))
                };
            }).Where(x => x is not null).Select(x => x!).ToList();

            Legend.ItemsSource = MilestoneTypes.Select(x =>
            {
                var colour = MileStoneColours[x.Key];
                return new { Text = x.Value.Code, Colour = new SolidColorBrush(colour) };
            }).ToList();

            Pie.ItemsSource = data;

            ShowView();
        }

        public void Shutdown()
        {
        }
    }
}