// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;
using System.Linq;
using Mono.Cecil;
using Mono.Collections.Generic;

namespace Mono.Linker
{
    /// <summary>
    /// This attribute name will be the name hardcoded in trimming which will remove all
    /// attribute usages but not the attribute definition
    /// </summary>
    [AttributeUsage(
        AttributeTargets.Class, Inherited = false)]
    public sealed class RemoveAttributeInstancesAttribute : Attribute
    {
        public RemoveAttributeInstancesAttribute(Collection<CustomAttributeArgument> args)
        {
            if (args.Count == 0)
            {
                Arguments = Array.Empty<CustomAttributeArgument>();
                return;
            }
            var arg = args[0];
            if (arg.Value is CustomAttributeArgument[] innerArgs)
                Arguments = innerArgs.Select(arg => (CustomAttributeArgument)arg.Value).ToArray();
            else
                Arguments = new CustomAttributeArgument[] { (CustomAttributeArgument)arg.Value };
        }

        public CustomAttributeArgument[] Arguments { get; }

        // This might be also useful to add later
        // public bool ExactArgumentsOnly { get; set; }
    }
}