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using System;
using System.Collections;
using NUnit.Framework;

namespace SpecUnit
{
	public delegate void MethodThatThrows();

	public static class SpecificationExtensions
	{
		public static void ShouldBeFalse(this bool condition)
		{
			Assert.IsFalse(condition);
		}

		public static void ShouldBeTrue(this bool condition)
		{
			Assert.IsTrue(condition);
		}

		public static object ShouldEqual(this object actual, object expected)
		{
			Assert.AreEqual(expected, actual);
			return expected;
		}

		public static object ShouldNotEqual(this object actual, object expected)
		{
			Assert.AreNotEqual(expected, actual);
			return expected;
		}

		public static void ShouldBeNull(this object anObject)
		{
			Assert.IsNull(anObject);
		}

		public static void ShouldNotBeNull(this object anObject)
		{
			Assert.IsNotNull(anObject);
		}

		public static object ShouldBeTheSameAs(this object actual, object expected)
		{
			Assert.AreSame(expected, actual);
			return expected;
		}

		public static object ShouldNotBeTheSameAs(this object actual, object expected)
		{
			Assert.AreNotSame(expected, actual);
			return expected;
		}

		public static void ShouldBeOfType(this object actual, Type expected)
		{
			Assert.IsInstanceOfType(expected, actual);
		}

		public static void ShouldBe(this object actual, Type expected)
		{
			Assert.IsInstanceOfType(expected, actual);
		}

		public static void ShouldNotBeOfType(this object actual, Type expected)
		{
			Assert.IsNotInstanceOfType(expected, actual);
		}

		public static void ShouldContain(this IList actual, object expected)
		{
			Assert.Contains(expected, actual);
		}

		public static void ShouldNotContain(this IList collection, object expected)
		{
			CollectionAssert.DoesNotContain(collection, expected);
		}

		public static IComparable ShouldBeGreaterThan(this IComparable arg1, IComparable arg2)
		{
			Assert.Greater(arg1, arg2);
			return arg2;
		}

		public static IComparable ShouldBeLessThan(this IComparable arg1, IComparable arg2)
		{
			Assert.Less(arg1, arg2);
			return arg2;
		}

		public static void ShouldBeEmpty(this ICollection collection)
		{
			Assert.IsEmpty(collection);
		}

		public static void ShouldBeEmpty(this string aString)
		{
			Assert.IsEmpty(aString);
		}

		public static void ShouldNotBeEmpty(this ICollection collection)
		{
			Assert.IsNotEmpty(collection);
		}

		public static void ShouldNotBeEmpty(this string aString)
		{
			Assert.IsNotEmpty(aString);
		}

		public static void ShouldContain(this string actual, string expected)
		{
			StringAssert.Contains(expected, actual);
		}

		public static void ShouldNotContain(this string actual, string expected)
		{
			try
			{
				StringAssert.Contains(expected, actual);
			}
			catch (AssertionException)
			{
				return;
			}

			throw new AssertionException(String.Format("\"{0}\" should not contain \"{1}\".", actual, expected));
		}

		public static string ShouldBeEqualIgnoringCase(this string actual, string expected)
		{
			StringAssert.AreEqualIgnoringCase(expected, actual);
			return expected;
		}

		public static void ShouldStartWith(this string actual, string expected)
		{
			StringAssert.StartsWith(expected, actual);
		}

		public static void ShouldEndWith(this string actual, string expected)
		{
			StringAssert.EndsWith(expected, actual);
		}

		public static void ShouldBeSurroundedWith(this string actual, string expectedStartDelimiter, string expectedEndDelimiter)
		{
			StringAssert.StartsWith(expectedStartDelimiter, actual);
			StringAssert.EndsWith(expectedEndDelimiter, actual);
		}

		public static void ShouldBeSurroundedWith(this string actual, string expectedDelimiter)
		{
			StringAssert.StartsWith(expectedDelimiter, actual);
			StringAssert.EndsWith(expectedDelimiter, actual);
		}

		public static void ShouldContainErrorMessage(this Exception exception, string expected)
		{
			StringAssert.Contains(expected, exception.Message);
		}

		public static Exception ShouldBeThrownBy(this Type exceptionType, MethodThatThrows method)
		{
			Exception exception = method.GetException();

			Assert.IsNotNull(exception);
			Assert.AreEqual(exceptionType, exception.GetType());

			return exception;
		}

		public static Exception GetException(this MethodThatThrows method)
		{
			Exception exception = null;

			try
			{
				method();
			}
			catch (Exception e)
			{
				exception = e;
			}

			return exception;
		}
	}
}