// -----------------------------------------------------------------------
// <copyright file="Renderer.cs" company="Steven Kirk">
// Copyright 2013 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex.Direct2D1
{
    using System;
    using Perspex.Direct2D1.Media;
    using Perspex.Media;
    using Perspex.Platform;
    using Perspex.Rendering;
    using SharpDX;
    using SharpDX.Direct2D1;
    using Splat;
    using DwFactory = SharpDX.DirectWrite.Factory;

    public class Renderer : RendererBase
    {
        /// <summary>
        /// The render target.
        /// </summary>
        private RenderTarget renderTarget;

        /// <summary>
        /// Initializes a new instance of the <see cref="Renderer"/> class.
        /// </summary>
        /// <param name="hwnd">The window handle.</param>
        /// <param name="width">The width of the window.</param>
        /// <param name="height">The height of the window.</param>
        public Renderer(IntPtr hwnd, double width, double height)
        {
            this.Direct2DFactory = Locator.Current.GetService<Factory>();
            this.DirectWriteFactory = Locator.Current.GetService<DwFactory>();

            RenderTargetProperties renderTargetProperties = new RenderTargetProperties
            {
            };

            HwndRenderTargetProperties hwndProperties = new HwndRenderTargetProperties
            {
                Hwnd = hwnd,
                PixelSize = new Size2((int)width, (int)height),
                PresentOptions = PresentOptions.Immediately,
            };

            this.renderTarget = new WindowRenderTarget(
                this.Direct2DFactory,
                renderTargetProperties,
                hwndProperties);
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="Renderer"/> class.
        /// </summary>
        /// <param name="renderTarget">The render target.</param>
        public Renderer(RenderTarget renderTarget)
        {
            this.Direct2DFactory = Locator.Current.GetService<Factory>();
            this.DirectWriteFactory = Locator.Current.GetService<DwFactory>();
            this.renderTarget = renderTarget;
        }

        /// <summary>
        /// Gets the Direct2D factory.
        /// </summary>
        public Factory Direct2DFactory
        {
            get;
            private set;
        }

        /// <summary>
        /// Gets the DirectWrite factory.
        /// </summary>
        public DwFactory DirectWriteFactory
        {
            get;
            private set;
        }

        /// <summary>
        /// Resizes the renderer.
        /// </summary>
        /// <param name="width">The new width.</param>
        /// <param name="height">The new height.</param>
        public override void Resize(int width, int height)
        {
            WindowRenderTarget window = this.renderTarget as WindowRenderTarget;

            if (window == null)
            {
                throw new InvalidOperationException(string.Format(
                    "A renderer with a target of type '{0}' cannot be resized.",
                    this.renderTarget.GetType().Name));
            }

            window.Resize(new Size2(width, height));
        }

        /// <summary>
        /// Creates a drawing context for a rendering session.
        /// </summary>
        /// <param name="handle">The platform handle. Unused.</param>
        /// <returns>An <see cref="IDrawingContext"/>.</returns>
        protected override IDrawingContext CreateDrawingContext(IPlatformHandle handle)
        {
            return new DrawingContext(this.renderTarget, this.DirectWriteFactory);
        }
    }
}