// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Reflection.Metadata;

namespace System.Reflection.Emit
{
    internal sealed class GenericTypeParameterBuilderImpl : GenericTypeParameterBuilder
    {
        private readonly string _name;
        private readonly TypeBuilder _type;
        private readonly int _genParamPosition;
        private GenericParameterAttributes _genParamAttributes;
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
        private Type? _parent;

        internal List<CustomAttributeWrapper>? _customAttributes;
        internal List<Type>? _interfaces;
        private MethodBuilderImpl? _methodBuilder;
        internal EntityHandle _parentHandle;

        internal GenericTypeParameterBuilderImpl(string name, int genParamPosition, TypeBuilderImpl typeBuilder)
        {
            _name = name;
            _genParamPosition = genParamPosition;
            _type = typeBuilder;
        }

        public GenericTypeParameterBuilderImpl(string name, int genParamPosition, MethodBuilderImpl methodBuilder, TypeBuilderImpl typeBuilder)
        {
            _name = name;
            _genParamPosition = genParamPosition;
            _methodBuilder = methodBuilder;
            _type = typeBuilder;
        }

        protected override void SetBaseTypeConstraintCore([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type? baseTypeConstraint)
        {
            _parent = baseTypeConstraint;

            if (_parent != null)
            {
                _interfaces ??= new List<Type>();
                _interfaces.Add(_parent);
            }
        }

        protected override void SetCustomAttributeCore(ConstructorInfo con, ReadOnlySpan<byte> binaryAttribute)
        {
            _customAttributes ??= new List<CustomAttributeWrapper>();
            _customAttributes.Add(new CustomAttributeWrapper(con, binaryAttribute));
        }

        protected override void SetGenericParameterAttributesCore(GenericParameterAttributes genericParameterAttributes) =>
            _genParamAttributes = genericParameterAttributes;

        protected override void SetInterfaceConstraintsCore(params Type[]? interfaceConstraints)
        {
            if (interfaceConstraints != null)
            {
                _interfaces ??= new List<Type>(interfaceConstraints.Length);
                _interfaces.AddRange(interfaceConstraints);
            }
        }

        public override Type[] GetGenericParameterConstraints() =>
            _interfaces == null ? EmptyTypes : _interfaces.ToArray();
        public override bool IsGenericTypeParameter => _methodBuilder is null;
        public override bool IsGenericMethodParameter => _methodBuilder is not null;
        public override int GenericParameterPosition => _genParamPosition;
        public override GenericParameterAttributes GenericParameterAttributes => _genParamAttributes;
        public override string Name => _name;
        public override Module Module => _type.Module;
        public override Assembly Assembly => _type.Assembly;
        public override string? FullName => null;
        public override string? Namespace => null;
        public override string? AssemblyQualifiedName => null;
        public override Type UnderlyingSystemType => this;
        public override bool IsGenericTypeDefinition => false;
        public override bool IsGenericType => false;
        public override bool IsGenericParameter => true;
        public override bool IsConstructedGenericType => false;
        public override bool ContainsGenericParameters => false;
        public override MethodBase? DeclaringMethod => _type.DeclaringMethod;
        public override Type? BaseType => _parent;
        public override RuntimeTypeHandle TypeHandle => throw new NotSupportedException();
        public override Guid GUID => throw new NotSupportedException();
        protected override bool IsArrayImpl() => false;
        protected override bool IsByRefImpl() => false;
        protected override bool IsPointerImpl() => false;
        protected override bool IsPrimitiveImpl() => false;
        protected override bool IsCOMObjectImpl() => false;
        protected override bool HasElementTypeImpl() => false;
        protected override TypeAttributes GetAttributeFlagsImpl() => TypeAttributes.Public;
        public override Type? GetElementType() => null;
        public override object[] GetCustomAttributes(bool inherit) => throw new NotSupportedException();
        public override object[] GetCustomAttributes(Type attributeType, bool inherit) => throw new NotSupportedException();
        public override bool IsDefined(Type attributeType, bool inherit) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
        protected override ConstructorInfo GetConstructorImpl(BindingFlags bindingAttr, Binder? binder, CallingConventions callConvention, Type[] types, ParameterModifier[]? modifiers) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
        public override ConstructorInfo[] GetConstructors(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.NonPublicMethods)]
        protected override MethodInfo GetMethodImpl(string name, BindingFlags bindingAttr, Binder? binder, CallingConventions callConvention, Type[]? types, ParameterModifier[]? modifiers) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.NonPublicMethods)]
        public override MethodInfo[] GetMethods(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.NonPublicFields)]
        public override FieldInfo GetField(string name, BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.NonPublicFields)]
        public override FieldInfo[] GetFields(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces)]
        [return: DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces)]
        public override Type GetInterface(string name, bool ignoreCase) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces)]
        public override Type[] GetInterfaces() => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicEvents | DynamicallyAccessedMemberTypes.NonPublicEvents)]
        public override EventInfo GetEvent(string name, BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicEvents)]
        public override EventInfo[] GetEvents() => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties | DynamicallyAccessedMemberTypes.NonPublicProperties)]
        protected override PropertyInfo GetPropertyImpl(string name, BindingFlags bindingAttr, Binder? binder, Type? returnType, Type[]? types, ParameterModifier[]? modifiers) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties | DynamicallyAccessedMemberTypes.NonPublicProperties)]
        public override PropertyInfo[] GetProperties(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicNestedTypes | DynamicallyAccessedMemberTypes.NonPublicNestedTypes)]
        public override Type[] GetNestedTypes(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicNestedTypes | DynamicallyAccessedMemberTypes.NonPublicNestedTypes)]
        public override Type GetNestedType(string name, BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(TypeBuilderImpl.GetAllMembers)]
        public override MemberInfo[] GetMember(string name, MemberTypes type, BindingFlags bindingAttr) => throw new NotSupportedException();
        public override InterfaceMapping GetInterfaceMap([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.NonPublicMethods)] Type interfaceType) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicEvents | DynamicallyAccessedMemberTypes.NonPublicEvents)]
        public override EventInfo[] GetEvents(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(TypeBuilderImpl.GetAllMembers)]
        public override MemberInfo[] GetMembers(BindingFlags bindingAttr) => throw new NotSupportedException();
        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.NonPublicFields |
            DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.NonPublicMethods |
            DynamicallyAccessedMemberTypes.PublicProperties | DynamicallyAccessedMemberTypes.NonPublicProperties |
            DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
        public override object InvokeMember(string name, BindingFlags invokeAttr, Binder? binder, object? target, object?[]? args, ParameterModifier[]? modifiers, CultureInfo? culture, string[]? namedParameters) => throw new NotSupportedException();

        public override Type MakePointerType() =>
            SymbolType.FormCompoundType("*", this, 0)!;

        public override Type MakeByRefType() =>
            SymbolType.FormCompoundType("&", this, 0)!;

        [RequiresDynamicCode("The code for an array of the specified type might not be available.")]
        public override Type MakeArrayType() =>
            SymbolType.FormCompoundType("[]", this, 0)!;

        [RequiresDynamicCode("The code for an array of the specified type might not be available.")]
        public override Type MakeArrayType(int rank) =>
            SymbolType.FormCompoundType(SymbolType.FormatRank(rank), this, 0)!;
    }
}