using System;
using System.Collections.Generic;
using System.Diagnostics.Tracing;

namespace System.Reflection
{
    public static class RuntimeReflectionExtensions
    {
        private const BindingFlags everything = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;

        private static void CheckAndThrow(Type t)
        {
            if (t == null) throw new ArgumentNullException("type");
            if (!(t is RuntimeType)) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"));
        }

        private static void CheckAndThrow(MethodInfo m)
        {
            if (m == null) throw new ArgumentNullException("method");
            if (!(m is RuntimeMethodInfo)) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeMethodInfo"));
        }

        public static IEnumerable<PropertyInfo> GetRuntimeProperties(this Type type)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeProperties(type.GetFullNameForEtw());
            }
#endif
            IEnumerable<PropertyInfo> properties = type.GetProperties(everything);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeProperties(type.GetFullNameForEtw());
            }
#endif
            return properties;
        }
        public static IEnumerable<EventInfo> GetRuntimeEvents(this Type type)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeEvents(type.GetFullNameForEtw());
            }
#endif
            IEnumerable<EventInfo> events = type.GetEvents(everything);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeEvents(type.GetFullNameForEtw());
            }
#endif
            return events;
        }

        public static IEnumerable<MethodInfo> GetRuntimeMethods(this Type type)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeMethods(type.GetFullNameForEtw());
            }
#endif
            IEnumerable<MethodInfo> methods = type.GetMethods(everything);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeMethods(type.GetFullNameForEtw());
            }
#endif
            return methods;
        }

        public static IEnumerable<FieldInfo> GetRuntimeFields(this Type type)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeFields(type.GetFullNameForEtw());
            }
#endif
            IEnumerable<FieldInfo> fields = type.GetFields(everything);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeFields(type.GetFullNameForEtw());
            }
#endif

            return fields;
        }

        public static PropertyInfo GetRuntimeProperty(this Type type, string name)
        {
             CheckAndThrow(type);
#if !FEATURE_CORECLR
             if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
             {
                 FrameworkEventSource.Log.BeginGetRuntimeProperty(type.GetFullNameForEtw(), name != null ? name : "");
             }
#endif

             PropertyInfo pi = type.GetProperty(name);
#if !FEATURE_CORECLR
             if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
             {
                FrameworkEventSource.Log.EndGetRuntimeProperty(type.GetFullNameForEtw(), pi != null ? pi.GetFullNameForEtw() : "");
             }
#endif

             return pi;
        }
        public static EventInfo GetRuntimeEvent(this Type type, string name)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeEvent(type.GetFullNameForEtw(), name != null ? name : "");
            }
#endif
            EventInfo ei = type.GetEvent(name);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeEvent(type.GetFullNameForEtw(), ei != null ? ei.GetFullNameForEtw() : "");
            }
#endif

            return ei;
        }
        public static MethodInfo GetRuntimeMethod(this Type type, string name, Type[] parameters)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeMethod(type.GetFullNameForEtw(), name != null ? name : "");
            }
#endif
            MethodInfo mi = type.GetMethod(name, parameters);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeMethod(type.GetFullNameForEtw(), mi != null ? mi.GetFullNameForEtw() : "");
            }
#endif

            return mi;
        }
        public static FieldInfo GetRuntimeField(this Type type, string name)
        {
            CheckAndThrow(type);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.BeginGetRuntimeField(type.GetFullNameForEtw(), name != null ? name : "");
            }
#endif
            FieldInfo fi = type.GetField(name);
#if !FEATURE_CORECLR
            if (FrameworkEventSource.IsInitialized && FrameworkEventSource.Log.IsEnabled(EventLevel.Informational, FrameworkEventSource.Keywords.DynamicTypeUsage))
            {
                FrameworkEventSource.Log.EndGetRuntimeField(type.GetFullNameForEtw(), fi != null ? fi.GetFullNameForEtw() : "");
            }
#endif

            return fi;
        }
        public static MethodInfo GetRuntimeBaseDefinition(this MethodInfo method){
            CheckAndThrow(method);
            return method.GetBaseDefinition();
        }

        public static InterfaceMapping GetRuntimeInterfaceMap(this TypeInfo typeInfo, Type interfaceType)
        {
            if (typeInfo == null) throw new ArgumentNullException("typeInfo");
            if (!(typeInfo is RuntimeType)) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"));

            return typeInfo.GetInterfaceMap(interfaceType);
        }

        public static MethodInfo GetMethodInfo(this Delegate del)
        {
            if (del == null) throw new ArgumentNullException("del");

            return del.Method;
        }
    }
}