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using System.Reflection;
using NUnit.Framework;

namespace XenAdminTests.UnitTests.UnitTestHelper
{
    public class VerifyGettersAndSetters : IUnitTestVerifier
    {
        private readonly object classToVerify = null;

        /// <param name="classToVerify">A class with getters and setters to verify</param>
        public VerifyGettersAndSetters(object classToVerify)
        {
            this.classToVerify = classToVerify;
        }

        /// <summary>
        /// Use this when you want to test that some data is set and the same data is retrieved afterwards
        /// </summary>
        /// <param name="expected">A struct of expected data content with members having the same name and return type as the getters and setters of the class</param>
        public void Verify(object expected)
        {
            VerifySettersAndGetters(expected, expected);
        }

        /// <summary>
        /// Use this when you want to test that some data is set and a set of different data is retrieved afterwards.
        /// This is useful when your class manipulates the underlying data before returning/storing it
        /// </summary>
        /// <param name="expected">A struct of expected data content with members having the same name and return type as the getters and setters of the class</param>
        /// <param name="toSet">A struct of data to set with members having the same name and return type as the getters and setters of the class</param>
        public void VerifySettersAndGetters(object expected, object toSet)
        {
            FieldInfo[] fields = expected.GetType().GetFields();
            foreach (FieldInfo fieldInfo in fields)
            {
                object valueToSet = fieldInfo.GetValue(toSet);
                string fieldName = fieldInfo.Name;

                PropertyInfo setter = classToVerify.GetType().GetProperty(fieldName);
                setter.SetValue(classToVerify, valueToSet, null);

                object expectedValue = fieldInfo.GetValue(expected);
                PropertyInfo getter = classToVerify.GetType().GetProperty(fieldName);
                Assert.AreEqual(expectedValue, getter.GetValue(classToVerify, null), "Property mismatched: " + fieldName);
            }
        }
    }
}