using System;
using Artemis.Core.Services;
using SkiaSharp;
using Stylet;

namespace Artemis.Core.LayerEffects
{
    /// <summary>
    ///     For internal use only, please use <see cref="LayerEffect{T}" /> instead
    /// </summary>
    public abstract class BaseLayerEffect : PropertyChangedBase, IDisposable
    {
        private LayerEffectConfigurationDialog _configurationDialog;
        private LayerEffectDescriptor _descriptor;
        private bool _enabled;
        private Guid _entityId;
        private bool _hasBeenRenamed;
        private string _name;
        private int _order;
        private RenderProfileElement _profileElement;

        /// <summary>
        ///     Gets the unique ID of this effect
        /// </summary>
        public Guid EntityId
        {
            get => _entityId;
            internal set => SetAndNotify(ref _entityId, value);
        }

        /// <summary>
        ///     Gets the profile element (such as layer or folder) this effect is applied to
        /// </summary>
        public RenderProfileElement ProfileElement
        {
            get => _profileElement;
            internal set => SetAndNotify(ref _profileElement, value);
        }

        /// <summary>
        ///     The name which appears in the editor
        /// </summary>
        public string Name
        {
            get => _name;
            set => SetAndNotify(ref _name, value);
        }

        /// <summary>
        ///     Gets or sets the enabled state, if not enabled the effect is skipped in render and update
        /// </summary>
        public bool Enabled
        {
            get => _enabled;
            set => SetAndNotify(ref _enabled, value);
        }

        /// <summary>
        ///     Gets or sets whether the effect has been renamed by the user, if true consider refraining from changing the name
        ///     programatically
        /// </summary>
        public bool HasBeenRenamed
        {
            get => _hasBeenRenamed;
            set => SetAndNotify(ref _hasBeenRenamed, value);
        }

        /// <summary>
        ///     Gets the order in which this effect appears in the update loop and editor
        /// </summary>
        public int Order
        {
            get => _order;
            set => SetAndNotify(ref _order, value);
        }

        /// <summary>
        ///     Gets the <see cref="LayerEffectDescriptor" /> that registered this effect
        /// </summary>
        public LayerEffectDescriptor Descriptor
        {
            get => _descriptor;
            internal set => SetAndNotify(ref _descriptor, value);
        }

        /// <summary>
        ///     Gets or sets a configuration dialog complementing the regular properties
        /// </summary>
        public LayerEffectConfigurationDialog ConfigurationDialog
        {
            get => _configurationDialog;
            protected set => SetAndNotify(ref _configurationDialog, value);
        }

        /// <summary>
        ///     Gets the plugin info that defined this effect
        /// </summary>
        public PluginInfo PluginInfo => Descriptor.LayerEffectProvider?.PluginInfo;

        /// <summary>
        ///     Gets a reference to the layer property group without knowing it's type
        /// </summary>
        public virtual LayerPropertyGroup BaseProperties => null;

        internal string PropertyRootPath => $"LayerEffect.{EntityId}.{GetType().Name}.";

        /// <inheritdoc />
        public void Dispose()
        {
            DisableLayerEffect();
            BaseProperties?.Dispose();
        }

        /// <summary>
        ///     Called when the layer effect is activated
        /// </summary>
        public abstract void EnableLayerEffect();

        /// <summary>
        ///     Called when the layer effect is deactivated
        /// </summary>
        public abstract void DisableLayerEffect();

        /// <summary>
        ///     Called before rendering every frame, write your update logic here
        /// </summary>
        /// <param name="deltaTime"></param>
        public abstract void Update(double deltaTime);

        /// <summary>
        ///     Called before the layer or folder will be rendered
        /// </summary>
        /// <param name="canvas">The canvas used to render the frame</param>
        /// <param name="canvasInfo">Info on the canvas size and pixel type</param>
        /// <param name="renderBounds">The bounds this layer/folder will render in</param>
        /// <param name="paint">The paint this layer/folder will use to render</param>
        public abstract void PreProcess(SKCanvas canvas, SKImageInfo canvasInfo, SKPath renderBounds, SKPaint paint);

        /// <summary>
        ///     Called after the layer of folder has been rendered
        /// </summary>
        /// <param name="canvas">The canvas used to render the frame</param>
        /// <param name="canvasInfo">Info on the canvas size and pixel type</param>
        /// <param name="renderBounds">The bounds this layer/folder rendered in</param>
        /// <param name="paint">The paint this layer/folder used to render</param>
        public abstract void PostProcess(SKCanvas canvas, SKImageInfo canvasInfo, SKPath renderBounds, SKPaint paint);

        // Not only is this needed to initialize properties on the layer effects, it also prevents implementing anything
        // but LayerEffect<T> outside the core
        internal abstract void Initialize();

        internal virtual string GetEffectTypeName() => GetType().Name;
    }
}