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

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;

namespace Microsoft.Extensions.DependencyInjection.ServiceLookup
{
    internal sealed class IEnumerableCallSite : ServiceCallSite
    {
        internal Type ItemType { get; }
        internal ServiceCallSite[] ServiceCallSites { get; }

        public IEnumerableCallSite(ResultCache cache, Type itemType, ServiceCallSite[] serviceCallSites, object? serviceKey = null) : base(cache, serviceKey)
        {
            Debug.Assert(ServiceProvider.IsDynamicCodeSupported || !itemType.IsValueType, "When dynamic code isn't supported, an IEnumerableCallSite should not be created with a ValueType.");

            ItemType = itemType;
            ServiceCallSites = serviceCallSites;
        }

        [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
            Justification = "When dynamic code isn't supported (ServiceProvider.IsDynamicCodeSupported is false), which is the case by default when PublishAot=true, " +
            "CallSiteFactory ensures ItemType is not a ValueType.")]
        public override Type ServiceType => typeof(IEnumerable<>).MakeGenericType(ItemType);

        [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
            Justification = "When dynamic code isn't supported (ServiceProvider.IsDynamicCodeSupported is false), which is the case by default when PublishAot=true, " +
            "CallSiteFactory ensures ItemType is not a ValueType.")]
        public override Type ImplementationType => ItemType.MakeArrayType();

        public override CallSiteKind Kind { get; } = CallSiteKind.IEnumerable;
    }
}