using System.Collections.Generic;
using System.Runtime.InteropServices;
using Decal.Interop.Core;
using Decal.Interop.Inject;
using Decal.Interop.Render;

namespace Decal.DecalRender
{
    [ComVisible(true)]
    [Guid("FB3C8286-88ED-4B4D-B413-94B40F346239")]
    [ClassInterface(ClassInterfaceType.None)]
    [ComSourceInterfaces("Decal.Interop.Render.IRenderServiceEvents\0\0")]
    [ProgId("DecalRender.RenderService")]
    public class RenderServiceImpl : IRenderService, IDecalService, IDecalRender
    {
        public event IRenderServiceEvents_DeviceLostEventHandler DeviceLost;

        private object _device;
        private readonly List<HUDViewImpl> _huds = new List<HUDViewImpl>();

        // IRenderService
        public object Device => _device;

        public HUDView CreateHUD(ref tagRECT pRegion)
        {
            var hud = new HUDViewImpl { Region = pRegion };
            _huds.Add(hud);
            return (HUDView)(object)hud;
        }

        public HUDBackground CreateBackground(ref tagRECT pRegion)
        {
            return (HUDBackground)(object)new HUDBackgroundImpl { Region = pRegion };
        }

        public HUDView EncapsulateHUD(ref tagPOINT Coords, object pSurface)
        {
            var region = new tagRECT { left = Coords.x, top = Coords.y };
            var hud = new HUDViewImpl { Region = region };
            hud.SetSurface(pSurface);
            _huds.Add(hud);
            return (HUDView)(object)hud;
        }

        public HUDBackground EncapsulateBackground(ref tagPOINT Coords, object pSurface)
        {
            var region = new tagRECT { left = Coords.x, top = Coords.y };
            var bg = new HUDBackgroundImpl { Region = region };
            bg.SetSurface(pSurface);
            return (HUDBackground)(object)bg;
        }

        public void RemoveHUD(HUDView pHUD)
        {
            var impl = pHUD as HUDViewImpl;
            if (impl != null)
                _huds.Remove(impl);
        }

        // IDecalService
        public void Initialize(DecalCore pDecal) { }
        public void BeforePlugins() { }
        public void AfterPlugins() { }
        public void Terminate() { _huds.Clear(); }

        // IDecalRender
        public void Render2D() { }
        public void Render3D() { }
        public void PreReset() { DeviceLost?.Invoke(); }
        public void PostReset() { }
        public void ChangeHWND() { }
        public void ChangeDirectX() { }
    }
}
