using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.WPF;
using NPOI.HSSF.Util;
using Syncfusion.Windows.Tools.Controls;

namespace PRSDesktop
{
    public class EquipmentSelectorData
    {
        // if first == FullGuid, remainder are selected
        // Otherwise, ignore the rest
        public Guid[] Groups { get; set; }
        
        // if first == FullGuid, select all
        public Guid[] Equipment { get; set; }
        
        public EquipmentSelectorData( Guid[] groups, Guid[] equipment)
        {
            Groups = groups;
            Equipment = equipment;
        }

        public EquipmentSelectorData() : this(new[] { Guid.Empty }, new[] { CoreUtils.FullGuid })
        {
        }
    }

    public class EquipmentSelectorSettings
    {
        public double SplitPosition { get; set; }

        public EquipmentSelectorSettings()
        {
            SplitPosition = 200.0F;
        }
    }
    
    public class EquipmentSelectorSettingsChangedArgs : EventArgs
    {
        public EquipmentSelectorSettings Settings { get; private set; }

        public EquipmentSelectorSettingsChangedArgs(EquipmentSelectorSettings settings)
        {
            Settings = settings;
        }
    }
    
    public delegate void EquipmentSelectorSettingsChanged(object sender, EquipmentSelectorSettingsChangedArgs args);
    
    public class EquipmentSelectorSelectionChangedArgs : EventArgs
    {
        public EquipmentSelectorData Selection { get; private set; }

        public EquipmentSelectorSelectionChangedArgs(EquipmentSelectorData selection)
        {
            Selection = selection;
        }
    }

    public delegate void EquipmentSelectorSelectionChanged(object sender, EquipmentSelectorSelectionChangedArgs args);


    public partial class EquipmentSelector : UserControl
    {

        private enum Suppress
        {
            This
        }

        private class ListEntry
        {
            public Guid Key { get; set; }
            public String Value { get; set; }
            public BitmapImage Image { get; set; }

            public ListEntry(Guid key, String value, BitmapImage image = null)
            {
                Key = key;
                Value = value;
                Image = image;
            }
        }

        public EquipmentSelectorSettings Settings { get; set; }
        
        public event EquipmentSelectorSettingsChanged SettingsChanged;
        public event EquipmentSelectorSelectionChanged SelectionChanged;
        
        private CoreTable _equipment;
        private CoreTable _activities;
        private ListEntry[] _groups;
        private Tuple<Guid,Guid,String, BitmapImage?>[] _equipmentgroups;

        public T[] GetEquipmentData<T>(Func<CoreRow, BitmapImage?, EquipmentActivity[], T> transform)
        {
            List<T> result = new List<T>();
            var selgrps = GetSelectedGroups();
            var seleq = GetSelectedEquipment();
            var eqids = _equipmentgroups
                .Where(x => selgrps.Contains(x.Item1) && seleq.Contains(CoreUtils.FullGuid) || seleq.Contains(x.Item2))
                .Select(x => x.Item2)
                .Distinct()
                .ToArray();
            var rows = _equipment.Rows.Where(r => eqids.Contains(r.Get<Equipment, Guid>(c => c.ID)));
            foreach (var row in rows)
            {
                var activities = _activities.Rows
                    .Where(r => r.Get<EquipmentActivity, Guid>(c => c.Equipment.ID) ==
                                row.Get<Equipment, Guid>(c => c.ID))
                    .Select(r=>r.ToObject<EquipmentActivity>())
                    .ToArray();
                result.Add(
                    transform.Invoke(
                        row,
                        _groups.FirstOrDefault(x => x.Key == row.Get<Equipment, Guid>(c => c.GroupLink.ID))?.Image,
                        activities
                    )
                );
            }

            return result.ToArray();
        }
        
        public EquipmentSelector()
        {
            Settings = new EquipmentSelectorSettings();
            using (new EventSuppressor(Suppress.This))
                InitializeComponent();
        }
        

        public void Setup()
        {
            using (new EventSuppressor(Suppress.This))
            {
                var results = Client.QueryMultiple(
                    new KeyedQueryDef<Equipment>(LookupFactory.DefineFilter<Equipment>()),
                    new KeyedQueryDef<EquipmentActivity>(),
                    new KeyedQueryDef<EquipmentGroup>(LookupFactory.DefineFilter<EquipmentGroup>())
                );

                _equipment = results.Get<Equipment>();
                _activities = results.Get<EquipmentActivity>();
                var groups = results.Get<EquipmentGroup>();
                _groups = groups.Rows.Select(r => new ListEntry(
                    r.Get<EquipmentGroup,Guid>(c=>c.ID), 
                    r.Get<Team,String>(c=>c.Name)
                )).ToArray();
                GroupList.ItemsSource = _groups;
                
                var ids = groups.Rows.Select(r => r.Get<EquipmentGroup,Guid>(c=>c.Thumbnail.ID)).Distinct().Where(x => x != Guid.Empty).ToArray();
                var Images = ids.Any()
                    ? new Client<Document>().Load(new Filter<Document>(x=>x.ID).InList(ids))
                    : new Document[] { };
            
                foreach (var row in groups.Rows)
                {
                    var image = Images.FirstOrDefault(x => x.ID.Equals(row.Get<EquipmentGroup,Guid>(c=>c.Thumbnail.ID)));
                    var grp = _groups.FirstOrDefault(x => x.Key == row.Get<EquipmentGroup, Guid>(c => c.Thumbnail.ID));
                    if (grp != null)
                        grp.Image = ImageUtils.LoadImage(image.Data) ?? PRSDesktop.Resources.truck.AsBitmapImage();
                }
                
                ObservableCollection<ListEntry> groupdata = new() { new ListEntry(Guid.Empty, "All Equipment", PRSDesktop.Resources.truck.AsBitmapImage()) };
                foreach (var group in _groups)
                    groupdata.Add(group);
                groupdata.Add(new ListEntry(CoreUtils.FullGuid, "Multiple Groups", PRSDesktop.Resources.truck.AsBitmapImage()));
                Groups.ItemsSource = groupdata;
                
                _equipmentgroups = _equipment.Rows.Select(
                    row => new Tuple<Guid, Guid, String, BitmapImage?>(
                        row.Get<Equipment, Guid>(c => c.GroupLink.ID),
                        row.Get<Equipment, Guid>(c => c.ID),
                        row.Get<Equipment, String>(c => c.Description),
                        _groups.FirstOrDefault(x=>x.Key == row.Get<Equipment, Guid>(c => c.GroupLink.ID))?.Image
                    )
                ).Union(
                    _equipment.Rows.Select(
                        row => new Tuple<Guid,Guid,String, BitmapImage?>(
                            Guid.Empty,
                            row.Get<Equipment, Guid>(c => c.ID),
                            row.Get<Equipment, String>(c => c.Description),
                            PRSDesktop.Resources.truck.AsBitmapImage()
                        )
                    )    
                ).ToArray();

                Groups.SelectedValue = Guid.Empty;

            }

        }

        private void UpdateSettings()
        {
            bool changed = false;
            
            var groups = GetSelectedGroups();
            if (groups.Contains(CoreUtils.FullGuid) && (Math.Abs(Settings.SplitPosition - GroupListRow.Height.Value) >= 1.0F))
            {
                changed = true;
                Settings.SplitPosition = GroupListRow.Height.Value;
            }

            if (changed && (!EventSuppressor.IsSet(Suppress.This)))
                SettingsChanged?.Invoke(this, new EquipmentSelectorSettingsChangedArgs(Settings));
        }
        
        private Guid[] GetSelectedGroups()
        {
            Guid groupid = Groups.SelectedValue != null ? (Guid)Groups.SelectedValue : Guid.Empty;
            var teams = (groupid == CoreUtils.FullGuid)
                ? GroupList.SelectedItems
                    .OfType<ListEntry>()
                    .Select(x => x.Key)
                    .Prepend(groupid)
                    .ToArray()
                : new Guid[] { groupid };
            return teams;
        }

        private Guid[] GetSelectedEquipment()
        {
            var emps = (SelectedEquipment.SelectedItems.Count == SelectedEquipment.Items.Count)
                ? new Guid[] { CoreUtils.FullGuid }
                : SelectedEquipment.SelectedItems
                    .OfType<ListEntry>()
                    .Select(x => x.Key)
                    .ToArray();
            return emps;
        }

        public EquipmentSelectorData Selection
        {
            get => GetSelectionData();
            set => SelectEquipment(value);
        }
        
        private EquipmentSelectorData GetSelectionData()
        {
            return new EquipmentSelectorData(
                GetSelectedGroups(),
                GetSelectedEquipment()
            );
        }
        
        private void SelectEquipment(EquipmentSelectorData selection)
        {
            using (new EventSuppressor(Suppress.This))
            {
                Groups.SelectedValue = selection.Groups.Contains(CoreUtils.FullGuid)
                    ? CoreUtils.FullGuid
                    : selection.Groups.FirstOrDefault();
                LoadGroups(selection.Groups);
                var equipment = SelectedEquipment.ItemsSource as ObservableCollection<ListEntry>;
                var pairs = equipment.Where(x => selection.Equipment.Contains(CoreUtils.FullGuid) || selection.Equipment.Contains(x.Key));
                SelectedEquipment.SelectedItems.Clear();
                foreach (var pair in pairs)
                    SelectedEquipment.SelectedItems.Add(pair);
            }            
        }
        
        private void LoadGroups(Guid[] groupids)
        {
            using (new EventSuppressor(Suppress.This))
            {
                Guid groupid = groupids.FirstOrDefault();
                if (Guid.Equals(groupid, CoreUtils.FullGuid))
                {
                    GroupListRow.Height = new GridLength(Settings.SplitPosition, GridUnitType.Pixel);
                    GroupListSplitterRow.Height = new GridLength(4, GridUnitType.Pixel);
                    var selected = new ObservableCollection<object>(_groups.Where(x => groupids.Contains(x.Key)));
                    GroupList.SelectedItems = selected;
                    LoadEquipment(groupids.Skip(1).ToArray());
                }
                else
                {
                    GroupListRow.Height = new GridLength(0, GridUnitType.Pixel);
                    GroupListSplitterRow.Height = new GridLength(0, GridUnitType.Pixel);
                    LoadEquipment(new Guid[] { groupid });
                }
            }
        }

        private void LoadEquipment(Guid[] teamids)
        {
            using (new EventSuppressor(Suppress.This))
            {
                var eqs =_equipmentgroups
                    .OrderBy(x => x.Item3)
                    .Where(x => teamids.Contains(x.Item1))
                    .Select(x => new ListEntry(x.Item2, x.Item3))
                    .Distinct()
                    .ToArray();
                SelectedEquipment.ItemsSource = new ObservableCollection<ListEntry>(eqs);
                SelectedEquipment.SelectedItems = new ObservableCollection<object>(eqs);
            }
        }
        
        public void SelectEmployee(Guid employeeid)
        {
            using (new EventSuppressor(Suppress.This))
            {
                LoadGroups(new Guid[] { Guid.Empty });
                if (SelectedEquipment.ItemsSource is ObservableCollection<ListEntry> employees)
                {
                    var emp = employees.FirstOrDefault(x => x.Key == employeeid);
                    if (emp != null)
                        SelectedEquipment.SelectedItems = new ObservableCollection<object>() { emp };
                }
            }
        }
        
        private void TeamsSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.This))
                return;
            using (new EventSuppressor(Suppress.This))
                LoadGroups(GetSelectedGroups());
            UpdateSettings();
            SelectionChanged?.Invoke(this, new EquipmentSelectorSelectionChangedArgs(GetSelectionData())); 
        }
        
        private void SelectedGroups_ItemChecked(object? sender, ItemCheckedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.This))
                return;
            using (new EventSuppressor(Suppress.This))
                LoadEquipment(GetSelectedGroups());
            UpdateSettings();
            SelectionChanged?.Invoke(this, new EquipmentSelectorSelectionChangedArgs(GetSelectionData())); 
        }
        
        private void SelectedEquipment_OnItemChecked(object? sender, ItemCheckedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.This))
                return;
            UpdateSettings();
            SelectionChanged?.Invoke(this, new EquipmentSelectorSelectionChangedArgs(GetSelectionData()));            
        }
        
        private void SelectedGroups_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.This))
                return;
            UpdateSettings();
        }


    }
}