// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System;
using UnityEngine;

#if WINDOWS_UWP
using Windows.Foundation.Metadata;
#elif (UNITY_WSA && DOTNETWINRT_PRESENT)
using Microsoft.Windows.Foundation.Metadata;
#endif // WINDOWS_UWP

namespace Microsoft.MixedReality.Toolkit.Windows.Utilities
{
    /// <summary>
    /// Helper class for determining if a Windows API contract is available.
    /// </summary>
    /// <remarks>
    /// <para>See https://docs.microsoft.com/uwp/extension-sdks/windows-universal-sdk
    /// for a full list of contracts.</para>
    /// </remarks>
    public static class WindowsApiChecker
    {
        [Obsolete("The CheckApiContracts method is obsolete (and should not need to be called manually regardless) and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        public static void CheckApiContracts()
        {
            // Disable the obsolete warning to enable setting the properties for legacy code.
#if WINDOWS_UWP
            UniversalApiContractV8_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 8);
            UniversalApiContractV7_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 7);
            UniversalApiContractV6_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 6);
            UniversalApiContractV5_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5);
            UniversalApiContractV4_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 4);
            UniversalApiContractV3_IsAvailable = ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 3);
#else
            UniversalApiContractV8_IsAvailable = false;
            UniversalApiContractV7_IsAvailable = false;
            UniversalApiContractV6_IsAvailable = false;
            UniversalApiContractV5_IsAvailable = false;
            UniversalApiContractV4_IsAvailable = false;
            UniversalApiContractV3_IsAvailable = false;
#endif // WINDOWS_UWP
        }

        /// <summary>
        /// Checks to see if the requested method is present on the current platform.
        /// </summary>
        /// <param name="namespaceName">The namespace (ex: "Windows.UI.Input.Spatial") containing the class.</param>
        /// <param name="className">The name of the class containing the method (ex: "SpatialInteractionMananger").</param>
        /// <param name="methodName">The name of the method (ex: "IsSourceKindSupported").</param>
        /// <returns>True if the method is available and can be called. Otherwise, false.</returns>
        public static bool IsMethodAvailable(
            string namespaceName,
            string className,
            string methodName)
        {
#if WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
            return ApiInformation.IsMethodPresent($"{namespaceName}.{className}", methodName);
#else
            return false;
#endif // WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
        }

        /// <summary>
        /// Checks to see if the requested property is present on the current platform.
        /// </summary>
        /// <param name="namespaceName">The namespace (ex: "Windows.UI.Input.Spatial") containing the class.</param>
        /// <param name="className">The name of the class containing the method (ex: "SpatialPointerPose").</param>
        /// <param name="propertyName">The name of the method (ex: "Eyes").</param>
        /// <returns>True if the property is available and can be called. Otherwise, false.</returns>
        public static bool IsPropertyAvailable(
            string namespaceName,
            string className,
            string propertyName)
        {
#if WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
            return ApiInformation.IsPropertyPresent($"{namespaceName}.{className}", propertyName);
#else
            return false;
#endif // WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
        }

        /// <summary>
        /// Checks to see if the requested type is present on the current platform.
        /// </summary>
        /// <param name="namespaceName">The namespace (ex: "Windows.UI.Input.Spatial") containing the class.</param>
        /// <param name="typeName">The name of the class containing the method (ex: "SpatialPointerPose").</param>
        /// <returns>True if the type is available and can be called. Otherwise, false.</returns>
        public static bool IsTypeAvailable(
            string namespaceName,
            string typeName)
        {
#if WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
            return ApiInformation.IsTypePresent($"{namespaceName}.{typeName}");
#else
            return false;
#endif // UNITY_WSA && WINDOWS_UWP || (UNITY_WSA && DOTNETWINRT_PRESENT)
        }

        /// <summary>
        /// Is the Universal API Contract v8.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV8_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV8_IsAvailable { get; private set; }

        /// <summary>
        /// Is the Universal API Contract v7.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV7_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV7_IsAvailable { get; private set; }

        /// <summary>
        /// Is the Universal API Contract v6.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV6_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV6_IsAvailable { get; private set; }

        /// <summary>
        /// Is the Universal API Contract v5.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV5_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV5_IsAvailable { get; private set; }

        /// <summary>
        /// Is the Universal API Contract v4.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV4_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV4_IsAvailable { get; private set; }

        /// <summary>
        /// Is the Universal API Contract v3.0 Available?
        /// </summary>
        [Obsolete("The UniversalApiContractV3_IsAvailable property is obsolete and will be removed from a future version of MRTK. Please use IsMethodAvailable(), IsPropertyAvailable() or IsTypeAvailable().")]
        public static bool UniversalApiContractV3_IsAvailable { get; private set; }
    }
}