using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics.CodeAnalysis;
using DoubleDeckerbus.Drawing;
using DoubleDeckerbus.Entities;

namespace DoubleDeckerbus.Generics
{
    internal class DrawingBusEqutables : IEqualityComparer<DrawingBus?>
    {
        public bool Equals(DrawingBus? x, DrawingBus? y)
        {
            if (x == null && x.EntityBus == null)
                throw new ArgumentNullException(nameof(x));

            if (y == null && y.EntityBus == null)
                throw new ArgumentNullException(nameof(y));

            if ((x.GetType().Name != y.GetType().Name))
                return false;

            if (x.EntityBus.Speed != y.EntityBus.Speed)
                return false;

            if (x.EntityBus.Weight != y.EntityBus.Weight)
                return false;

            if (x.EntityBus.BodyColor != y.EntityBus.BodyColor)
                return false;

            if (x is DrawingDoubleDeckerbus && y is DrawingDoubleDeckerbus)
            {
                var xDoublebus = (EntityDoubleDeckerbus)x.EntityBus;
                var yDoublebus = (EntityDoubleDeckerbus)y.EntityBus;

                if (xDoublebus.AddColor != yDoublebus.AddColor)
                    return false;

                if (xDoublebus.IsSecondFloor != yDoublebus.IsSecondFloor)
                    return false;

                if (xDoublebus.IsStairs != yDoublebus.IsStairs)
                    return false;
            }
            return true;
        }

        public int GetHashCode([DisallowNull] DrawingBus? obj)
        {
            return obj.GetHashCode();
        }

    }
}