/*******************************************************************************
Copyright © 2015-2022 PICO Technology Co., Ltd.All rights reserved.  

NOTICE：All information contained herein is, and remains the property of 
PICO Technology Co., Ltd. The intellectual and technical concepts 
contained hererin are proprietary to PICO Technology Co., Ltd. and may be 
covered by patents, patents in process, and are protected by trade secret or 
copyright law. Dissemination of this information or reproduction of this 
material is strictly forbidden unless prior written permission is obtained from
PICO Technology Co., Ltd. 
*******************************************************************************/

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.UI;
using UnityEngine.XR.Management;
using UnityEngine.XR;

#if UNITY_INPUT_SYSTEM
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Layouts;
using UnityEngine.InputSystem.XR;
using Unity.XR.PICO.LivePreview.Input;
#endif

#if UNITY_EDITOR
using UnityEditor;
#endif


namespace Unity.XR.PICO.LivePreview
{
#if UNITY_INPUT_SYSTEM
#if UNITY_EDITOR
    [InitializeOnLoad]
#endif
    static class InputLayoutLoader
    {
        static InputLayoutLoader()
        {
            RegisterInputLayouts();
        }

        public static void RegisterInputLayouts()
        {
            InputSystem.RegisterLayout<PXR_PTHMD>(matches: new InputDeviceMatcher().WithInterface(XRUtilities.InterfaceMatchAnyVersion).WithProduct(@"^(PICO Live Preview HMD)"));
            InputSystem.RegisterLayout<PXR_PTController>(matches: new InputDeviceMatcher().WithInterface(XRUtilities.InterfaceMatchAnyVersion).WithProduct(@"^(PICO Live Preview Controller)"));
        }
    }
#endif

    public class PXR_PTLoader : XRLoaderHelper
#if UNITY_EDITOR
    , IXRLoaderPreInit
#endif
    {
        private static List<XRDisplaySubsystemDescriptor> displaySubsystemDescriptors = new List<XRDisplaySubsystemDescriptor>();
        private static List<XRInputSubsystemDescriptor> inputSubsystemDescriptors = new List<XRInputSubsystemDescriptor>();
        
        public XRDisplaySubsystem displaySubsystem
        {
            get
            {
                return GetLoadedSubsystem<XRDisplaySubsystem>();
            }
        }

        public XRInputSubsystem inputSubsystem
        {
            get
            {
                return GetLoadedSubsystem<XRInputSubsystem>();
            }
        }

        public override bool Initialize()
        {
#if UNITY_INPUT_SYSTEM
            InputLayoutLoader.RegisterInputLayouts();
#endif

#if UNITY_2020_1_OR_NEWER

            PXR_PTApi.UPxr_PTSetSRPState(GraphicsSettings.currentRenderPipeline != null);
#else
            PXR_PTApi.System.UPxr_PTSetSRPState(false);
#endif

            CreateSubsystem<XRDisplaySubsystemDescriptor, XRDisplaySubsystem>(displaySubsystemDescriptors, "PICO LP Display");
            CreateSubsystem<XRInputSubsystemDescriptor, XRInputSubsystem>(inputSubsystemDescriptors, "PICO LP Input");

            if (displaySubsystem == null && inputSubsystem == null)
            {
                Debug.LogError("PXRLog Unable to start PICO Plugin.");
            }
            else if (displaySubsystem == null)
            {
                Debug.LogError("PXRLog Failed to load display subsystem.");
            }
            else if (inputSubsystem == null)
            {
                Debug.LogError("PXRLog Failed to load input subsystem.");
            }
 
            return displaySubsystem != null;
        }

        public override bool Start()
        {
            StartSubsystem<XRDisplaySubsystem>();
            StartSubsystem<XRInputSubsystem>();

            Application.targetFrameRate = 72;
            return true;
        }

        public override bool Stop()
        {
            StopSubsystem<XRDisplaySubsystem>();
            StopSubsystem<XRInputSubsystem>();

            return true;
        }

        public override bool Deinitialize()
        {
            DestroySubsystem<XRDisplaySubsystem>();
            DestroySubsystem<XRInputSubsystem>();
            return true;
        }

#if UNITY_EDITOR
        public string GetPreInitLibraryName(BuildTarget buildTarget, BuildTargetGroup buildTargetGroup)
        {
            return "PxrLivePreview";
        }
#endif
    }
}