// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable AutoPropertyCanBeMadeGetOnly.Global
// ReSharper disable UnusedMember.Global

using System.Collections.Generic;
using System.Linq;
using RGB.NET.Core;

namespace RGB.NET.Presets.Groups
{
    /// <inheritdoc />
    /// <summary>
    /// Represents a <see cref="T:RGB.NET.Presets.Groups.RectangleLedGroup" /> containing <see cref="T:RGB.NET.Core.Led" /> which physically lay inside a <see cref="T:RGB.NET.Core.Rectangle" />.
    /// </summary>
    public class RectangleLedGroup : AbstractLedGroup
    {
        #region Properties & Fields

        private IList<Led>? _ledCache;

        private Rectangle _rectangle;
        /// <summary>
        /// Gets or sets the <see cref="Core.Rectangle"/> the <see cref="Led"/>  should be taken from.
        /// </summary>
        public Rectangle Rectangle
        {
            get => _rectangle;
            set
            {
                if (SetProperty(ref _rectangle, value))
                    InvalidateCache();
            }
        }

        private double _minOverlayPercentage;
        /// <summary>
        /// Gets or sets the minimal percentage overlay a <see cref="Led"/>  must have with the <see cref="Core.Rectangle" /> to be taken into the <see cref="RectangleLedGroup"/>.
        /// </summary>
        public double MinOverlayPercentage
        {
            get => _minOverlayPercentage;
            set
            {
                if (SetProperty(ref _minOverlayPercentage, value))
                    InvalidateCache();
            }
        }

        #endregion

        #region Constructors

        /// <inheritdoc />
        /// <summary>
        /// Initializes a new instance of the <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> class.
        /// </summary>
        /// <param name="fromLed">They first <see cref="T:RGB.NET.Core.Led" />  to calculate the <see cref="T:RGB.NET.Core.Rectangle" /> of this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> from.</param>
        /// <param name="toLed">They second <see cref="T:RGB.NET.Core.Led" />  to calculate the <see cref="T:RGB.NET.Core.Rectangle" /> of this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> from.</param>
        /// <param name="minOverlayPercentage">(optional) The minimal percentage overlay a <see cref="T:RGB.NET.Core.Led" />  must have with the <see cref="P:RGB.NET.Groups.RectangleLedGroup.Rectangle" /> to be taken into the <see cref="T:RGB.NET.Groups.RectangleLedGroup" />. (default: 0.5)</param>
        /// <param name="autoAttach">(optional) Specifies whether this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> should be automatically attached or not. (default: true)</param>
        public RectangleLedGroup(RGBSurface? surface, Led fromLed, Led toLed, double minOverlayPercentage = 0.5)
            : this(surface, new Rectangle(fromLed.Boundary, toLed.Boundary), minOverlayPercentage)
        { }

        /// <inheritdoc />
        /// <summary>
        /// Initializes a new instance of the <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> class.
        /// </summary>
        /// <param name="fromPoint">They first point to calculate the <see cref="T:RGB.NET.Core.Rectangle" /> of this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> from.</param>
        /// <param name="toPoint">They second point to calculate the <see cref="T:RGB.NET.Core.Rectangle" /> of this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> from.</param>
        /// <param name="minOverlayPercentage">(optional) The minimal percentage overlay a <see cref="T:RGB.NET.Core.Led" />  must have with the <see cref="P:RGB.NET.Groups.RectangleLedGroup.Rectangle" /> to be taken into the <see cref="T:RGB.NET.Groups.RectangleLedGroup" />. (default: 0.5)</param>
        /// <param name="autoAttach">(optional) Specifies whether this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> should be automatically attached or not. (default: true)</param>
        public RectangleLedGroup(RGBSurface? surface, Point fromPoint, Point toPoint, double minOverlayPercentage = 0.5)
            : this(surface, new Rectangle(fromPoint, toPoint), minOverlayPercentage)
        { }

        /// <inheritdoc />
        /// <summary>
        /// Initializes a new instance of the <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> class.
        /// </summary>
        /// <param name="rectangle">The <see cref="T:RGB.NET.Core.Rectangle" /> of this <see cref="T:RGB.NET.Groups.RectangleLedGroup" />.</param>
        /// <param name="minOverlayPercentage">(optional) The minimal percentage overlay a <see cref="T:RGB.NET.Core.Led" />  must have with the <see cref="P:RGB.NET.Groups.RectangleLedGroup.Rectangle" /> to be taken into the <see cref="T:RGB.NET.Groups.RectangleLedGroup" />. (default: 0.5)</param>
        /// <param name="autoAttach">(optional) Specifies whether this <see cref="T:RGB.NET.Groups.RectangleLedGroup" /> should be automatically attached or not. (default: true)</param>
        public RectangleLedGroup(RGBSurface? surface, Rectangle rectangle, double minOverlayPercentage = 0.5)
            : base(surface)
        {
            this.Rectangle = rectangle;
            this.MinOverlayPercentage = minOverlayPercentage;
        }

        #endregion

        #region Methods

        /// <inheritdoc />
        public override void OnAttach()
        {
            base.OnAttach();
            Surface!.SurfaceLayoutChanged += RGBSurfaceOnSurfaceLayoutChanged;
        }

        /// <inheritdoc />
        public override void OnDetach()
        {
            Surface!.SurfaceLayoutChanged -= RGBSurfaceOnSurfaceLayoutChanged;

            base.OnDetach();
        }

        private void RGBSurfaceOnSurfaceLayoutChanged(SurfaceLayoutChangedEventArgs args) => InvalidateCache();

        /// <inheritdoc />
        /// <summary>
        /// Gets a list containing all <see cref="T:RGB.NET.Core.Led" /> of this <see cref="T:RGB.NET.Presets.Groups.RectangleLedGroup" />.
        /// </summary>
        /// <returns>The list containing all <see cref="T:RGB.NET.Core.Led" /> of this <see cref="T:RGB.NET.Presets.Groups.RectangleLedGroup" />.</returns>
        protected override IEnumerable<Led> GetLeds() => _ledCache ??= (Surface?.Leds.Where(led => led.AbsoluteBoundary.CalculateIntersectPercentage(Rectangle) >= MinOverlayPercentage).ToList() ?? new List<Led>());

        private void InvalidateCache() => _ledCache = null;

        #endregion
    }
}