using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Chernobyl.Reflection;
using NUnit.Framework;

namespace Chernobyl.Attribution
{
    /// <summary>
    /// Tests for the <see cref="ProcessParametersAttribute"/> type.
    /// </summary>
    [TestFixture]
    public class ProcessParametersAttributeTests : ProcessAttributesTests<MethodInfo, ParameterInfo>
    {
        protected override Test CreateTest()
        {
            const string method1 = "Method1";
            MethodInfo testMethodInfo = typeof(TestParamClass).GetMethod(method1);
            ProcessParametersAttribute attribute =
                testMethodInfo.GetCustomAttributes<ProcessParametersAttribute>(true).First();

            return new Test(attribute, testMethodInfo,
                            new List<ParameterInfo>(testMethodInfo.GetParameters()),
                            TestReturnProcessParameterAttribute.MethodsProcessed);
        }
    }

    /// <summary>
    /// Helper type that is used to test <see cref="ProcessParametersAttribute"/> and
    /// related types.
    /// </summary>
    [AttributeUsage(AttributeTargets.Parameter)]
    public class TestReturnProcessParameterAttribute : Attribute, IProcessAttribute<ParameterInfo>
    {
        static TestReturnProcessParameterAttribute()
        {
            MethodsProcessed = new List<ParameterInfo>();
        }

        public void Process(ParameterInfo attributeProvider)
        {
            MethodsProcessed.Add(attributeProvider);
        }

        public static ICollection<ParameterInfo> MethodsProcessed { get; private set; }
    }

    public class TestParamClass
    {
        [ProcessParameters]
        public void Method1([TestReturnProcessParameter]int x,
                            [TestReturnProcessParameter]string y)
        { }
    }
}