using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using InABox.Core;

namespace Comal.Classes
{
    public class KanbanDocumentCount : CoreAggregate<Kanban, KanbanDocument, Guid>
    {
        public override Expression<Func<KanbanDocument, Guid>> Aggregate => x => x.ID;

        public override AggregateCalculation Calculation => AggregateCalculation.Count;

        public override Dictionary<Expression<Func<KanbanDocument, object>>, Expression<Func<Kanban, object>>> Links =>
            new Dictionary<Expression<Func<KanbanDocument, object>>, Expression<Func<Kanban, object>>> ()
            {
                { KanbanDocument => KanbanDocument.EntityLink.ID, Kanban => Kanban.ID }
            };
    }

    public class KanbaAssignmentDuration : CoreAggregate<Kanban, Assignment, TimeSpan>
    {
        public override Expression<Func<Assignment, TimeSpan>> Aggregate => x => x.Actual.Duration;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

        public override Dictionary<Expression<Func<Assignment, object>>, Expression<Func<Kanban, object>>> Links =>
            new Dictionary<Expression<Func<Assignment, object>>, Expression<Func<Kanban, object>>>()
            {
                { Assignment => Assignment.Task.ID, Kanban => Kanban.ID }
            };
    }

    public enum KanbanCategory
    {
        Open,
        InProgress,
        Waiting,
        Complete
    }

    [UserTracking("Task Management")]
    [Caption("Tasks")]
    public class Kanban : Entity, IPersistent, IRemotable, IKanban, IScheduleAction, IOneToMany<Schedule>, INumericAutoIncrement<Kanban>,
        IOneToMany<Equipment>, ILicense<TaskManagementLicense>, IExportable, IImportable
    {
        
        public static String OPEN => "Open";
        public static String INPROGRESS => "In Progress";
        public static String WAITING => "Waiting";
        public static String COMPLETE => "Complete";

        public static String[] ALL = new String[] { Kanban.OPEN, Kanban.INPROGRESS, Kanban.WAITING, Kanban.COMPLETE };
        
        private bool bChanging;

        [NullEditor]
        public DeliveryLink Delivery { get; set; }

        [IntegerEditor(Editable = Editable.Disabled)]
        [EditorSequence(-1)]
        public int Number { get; set; }

        [TextBoxEditor]
        [EditorSequence(0)]
        public string Title { get; set; }

        [EditorSequence(1)]
        [Caption("Attached to")]
        public JobLink JobLink { get; set; }

        [RichTextEditor]
        [EditorSequence(2)]
        public string Description { get; set; }

        [NotesEditor]
        [EditorSequence(3)]
        public string[] Notes { get; set; } = Array.Empty<string>();

        [MemoEditor(Visible = Visible.Optional, Editable = Editable.Hidden)]
        [EditorSequence(4)]
        public string Summary { get; set; }

        [EditorSequence(5)]
        [Caption("Task Type")]
        public KanbanTypeLink Type { get; set; }

        [DateEditor]
        [EditorSequence(6)]
        public DateTime DueDate { get; set; } = DateTime.Today;

        [EditorSequence(7)]
        [Caption("Assigned To")]
        public EmployeeLink EmployeeLink { get; set; }

        [EditorSequence(8)]
        [Caption("Allocated By")]
        public EmployeeLink ManagerLink { get; set; }

        [DateTimeEditor(Editable = Editable.Hidden)]
        [EditorSequence(9)]
        public DateTime Completed { get; set; } = DateTime.MinValue;

        [EditorSequence("Other", 1)]
        [Caption("Equipment Item")]
        public EquipmentLink Equipment { get; set; }

        [DateEditor]
        [EditorSequence("Other", 2)]
        public DateTime StartDate { get; set; } = DateTime.Today;

        [DurationEditor]
        [EditorSequence("Other", 3)]
        public TimeSpan EstimatedTime { get; set; } = TimeSpan.FromHours(1);

        [Aggregate(typeof(KanbaAssignmentDuration))]
        [EditorSequence("Other", 4)]
        public TimeSpan ActualTime { get; set; }

        [CheckBoxEditor]
        [EditorSequence("Other", 5)]
        public bool Private { get; set; }

        [EditorSequence("Other", 6)]
        [CheckBoxEditor]
        public bool Locked { get; set; }

        [ComboLookupEditor(typeof(KanbanCategoryLookups))]
        [EditorSequence("Other", 7)]
        [LoggableProperty]
        public string Category { get; set; }

        [SecondaryIndex]
        [NullEditor]
        public DateTime Closed { get; set; } = DateTime.MinValue;

        [NullEditor]
        [Aggregate(typeof(KanbanDocumentCount))]
        public int Attachments { get; set; }
        
        public Expression<Func<Kanban, int>> AutoIncrementField()
        {
            return x => x.Number;
        }

        public Filter<Kanban>? AutoIncrementFilter()
        {
            return null;
        }

        [NullEditor]
        public ScheduleLink ScheduleLink { get; set; }

        public static KanbanCategory StringToCategory(string category)
        {
            return string.Equals(category, "Complete")
                ? KanbanCategory.Complete
                : string.Equals(category, "Waiting")
                    ? KanbanCategory.Waiting
                    : string.Equals(category, "In Progress")
                        ? KanbanCategory.InProgress
                        : KanbanCategory.Open;
        }

        public static string CategoryToString(KanbanCategory category)
        {
            return category.Equals(KanbanCategory.Complete)
                ? "Complete"
                : category.Equals(KanbanCategory.Waiting)
                    ? "Waiting"
                    : category.Equals(KanbanCategory.InProgress)
                        ? "In Progress"
                        : "Open";
        }

        private bool IsCompleted(object? value)
        {
            if (value == null)
                return false;
            if (value is DateTime dateTime)
                return !dateTime.IsEmpty();
            return value.Equals("Complete") || value.Equals("Completed");
        }

        protected override void DoPropertyChanged(string name, object? before, object? after)
        {
            base.DoPropertyChanged(name, before, after);

            if (bChanging)
                return;
            bChanging = true;
            if (name.Equals("Completed")) // set the completed date
            {
                Category = IsCompleted(after) ? "Complete" : IsCompleted(Category) ? "In Progress" : Category;
            }
            else if (name.Equals("Category")) // set the completed date
            {
                Completed = IsCompleted(after) ? IsCompleted(Completed) ? Completed : DateTime.Now : DateTime.MinValue;
            }
            else if (name.Equals("Description"))
            {
                var summary = after as string;
                Summary = CoreUtils.StripHTML(summary);
            }

            bChanging = false;
        }

        private class KanbanCategoryLookups : LookupGenerator<object>
        {
            public KanbanCategoryLookups(object[] items) : base(items)
            {
                AddValue(Kanban.OPEN, "To Do");
                AddValue(Kanban.INPROGRESS, "In Progress");
                AddValue(Kanban.WAITING, "Waiting For Others");
                AddValue(Kanban.COMPLETE, "Completed");
            }
        }
        

    }
}