//
// ModuleBuilderTest - NUnit Test Cases for the ModuleBuilder class
//
// Zoltan Varga (vargaz@freemail.hu)
//
// (C) Ximian, Inc.  http://www.ximian.com
//
//


using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.IO;
using System.Collections;
using System.Diagnostics.SymbolStore;
using System.Runtime.InteropServices;

using NUnit.Framework;

namespace MonoTests.System.Reflection.Emit
{
	[TestFixture]
	public class ModuleBuilderTest
	{
		static string tempDir = Path.Combine (Path.GetTempPath (), typeof (ModuleBuilderTest).FullName);
		static int nameIndex = 0;

		[SetUp]
		public void SetUp ()
		{
			Random AutoRand = new Random ();
			string basePath = tempDir;
			while (Directory.Exists (tempDir))
				tempDir = Path.Combine (basePath, AutoRand.Next ().ToString ());
			Directory.CreateDirectory (tempDir);
		}

		[TearDown]
		public void TearDown ()
		{
			try {
				// This throws an exception under MS.NET, since the directory contains loaded
				// assemblies.
				Directory.Delete (tempDir, true);
			} catch (Exception) {
			}
		}

		private AssemblyName genAssemblyName ()
		{
			AssemblyName assemblyName = new AssemblyName();
			assemblyName.Name = typeof (ModuleBuilderTest).FullName + (nameIndex ++);
			return assemblyName;
		}

		private AssemblyBuilder genAssembly ()
		{
			return Thread.GetDomain ().DefineDynamicAssembly (genAssemblyName (),
															  AssemblyBuilderAccess.RunAndSave,
															  tempDir);
		}

		[Test]
		public void TestIsTransient ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb1 = ab.DefineDynamicModule ("foo.dll");
			Assert.IsTrue (mb1.IsTransient (), "#1");
			ModuleBuilder mb2 = ab.DefineDynamicModule ("foo2.dll", "foo2.dll");
			Assert.IsFalse (mb2.IsTransient (), "#2");
		}

		// Some of these tests overlap with the tests for Module

		[Test]
		public void TestGlobalData ()
		{
			AssemblyBuilder ab = genAssembly ();

			string resfile = Path.Combine (tempDir, "res");
			using (StreamWriter sw = new StreamWriter (resfile)) {
				sw.WriteLine ("FOO");
			}

			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll");

			mb.DefineInitializedData ("DATA", new byte [100], FieldAttributes.Public);
			mb.DefineInitializedData ("DATA2", new byte [100], FieldAttributes.Public);
			mb.DefineInitializedData ("DATA3", new byte [99], FieldAttributes.Public);
			mb.DefineUninitializedData ("DATA4", 101, FieldAttributes.Public);
			mb.DefineInitializedData ("DATA_PRIVATE", new byte [100], 0);
			mb.CreateGlobalFunctions ();

			ab.Save ("foo.dll");

			Assembly assembly = Assembly.LoadFrom (Path.Combine (tempDir, "foo.dll"));

			Module module = assembly.GetLoadedModules () [0];

			string [] expectedFieldNames = new string [] {
				"DATA", "DATA2", "DATA3", "DATA4" };
			ArrayList fieldNames = new ArrayList ();
			foreach (FieldInfo fi in module.GetFields ()) {
				fieldNames.Add (fi.Name);
			}
			AssertArrayEqualsSorted (expectedFieldNames, fieldNames.ToArray (typeof (string)));

			Assert.IsNotNull (module.GetField ("DATA"), "#1");
			Assert.IsNotNull (module.GetField ("DATA2"), "#2");
			Assert.IsNotNull (module.GetField ("DATA3"), "#3");
			Assert.IsNotNull (module.GetField ("DATA4"), "#4");
			Assert.IsNull (module.GetField ("DATA_PRIVATE"), "#5");
			Assert.IsNotNull (module.GetField ("DATA_PRIVATE", BindingFlags.NonPublic | BindingFlags.Static), "#6");
		}

		[Test]
		public void TestGlobalMethods ()
		{
			AssemblyBuilder builder = genAssembly ();
			ModuleBuilder module = builder.DefineDynamicModule ("MessageModule");
			MethodBuilder method = module.DefinePInvokeMethod ("printf", "libc.so",
															  MethodAttributes.PinvokeImpl | MethodAttributes.Static | MethodAttributes.Public,
															  CallingConventions.Standard, typeof (void), new Type [] { typeof (string) }, CallingConvention.Winapi,
															  CharSet.Auto);
			method.SetImplementationFlags (MethodImplAttributes.PreserveSig |
										   method.GetMethodImplementationFlags ());
			module.CreateGlobalFunctions ();

			Assert.IsNotNull (module.GetMethod ("printf"));
		}

		[Test]
		public void TestDefineType_InterfaceNotAbstract ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll", true);

			try {
				mb.DefineType ("ITest1", TypeAttributes.Interface);
				Assert.Fail ("#A1");
			} catch (InvalidOperationException ex) {
				// Interface must be declared abstract
				Assert.AreEqual (typeof (InvalidOperationException), ex.GetType (), "#A2");
				Assert.IsNull (ex.InnerException, "#A3");
				Assert.IsNotNull (ex.Message, "#A4");
			}

			try {
				mb.DefineType ("ITest2", TypeAttributes.Interface, (Type) null);
				Assert.Fail ("#B1");
			} catch (InvalidOperationException ex) {
				// Interface must be declared abstract
				Assert.AreEqual (typeof (InvalidOperationException), ex.GetType (), "#B2");
				Assert.IsNull (ex.InnerException, "#B3");
				Assert.IsNotNull (ex.Message, "#B4");
			}

			// fail on MS .NET 1.1
#if NET_2_0
			TypeBuilder tb = mb.DefineType ("ITest2", TypeAttributes.Interface,
				typeof (object));
			Assert.AreEqual (typeof (object), tb.BaseType, "#C1");

			tb = mb.DefineType ("ITest3", TypeAttributes.Interface,
				typeof (IDisposable));
			Assert.AreEqual (typeof (IDisposable), tb.BaseType, "#D1");
#endif
		}

		[Test]
		public void DuplicateSymbolDocument ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll", true);

			// Check that it is possible to redefine a symbol document
			ISymbolDocumentWriter doc1 =
				mb.DefineDocument ("foo.il", SymDocumentType.Text,
								  SymLanguageType.ILAssembly, SymLanguageVendor.Microsoft);
			ISymbolDocumentWriter doc2 =
				mb.DefineDocument ("foo.il", SymDocumentType.Text,
								  SymLanguageType.ILAssembly, SymLanguageVendor.Microsoft);
		}

		[Test] // Test case for #80435.
		public void GetArrayMethodToStringTest ()
		{
			AssemblyBuilder assembly = genAssembly ();
			ModuleBuilder module = assembly.DefineDynamicModule ("m", "test.dll");

			Type [] myArrayClass = new Type [1];
			Type [] parameterTypes = { typeof (Array) };
			MethodInfo myMethodInfo = module.GetArrayMethod (myArrayClass.GetType (), "Sort", CallingConventions.Standard, null, parameterTypes);

			string str = myMethodInfo.ToString ();
			Assert.IsNotNull (str);
			// Don't compare string, since MS returns System.Reflection.Emit.SymbolMethod here 
			// (they do not provide an implementation of ToString).
		}

		private static void AssertArrayEqualsSorted (Array o1, Array o2)
		{
			Array s1 = (Array) o1.Clone ();
			Array s2 = (Array) o2.Clone ();

			Array.Sort (s1);
			Array.Sort (s2);

			Assert.AreEqual (s1.Length, s2.Length, "#1");
			for (int i = 0; i < s1.Length; ++i)
				Assert.AreEqual (s1.GetValue (i), s2.GetValue (i), "#2: " + i);
		}

#if NET_2_0
		[Test]
		public void ResolveFieldTokenFieldBuilder ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll");

			TypeBuilder tb = mb.DefineType ("foo");
			FieldBuilder fb = tb.DefineField ("foo", typeof (int), 0);
			tb.CreateType ();

			FieldInfo fi = mb.ResolveField (fb.GetToken ().Token);
			Assert.IsNotNull (fi);
			Assert.AreEqual ("foo", fi.Name);
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void ResolveFieldTokenInvalidToken ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll");

			mb.ResolveField (0x4001234);
		}

		[Test]
		public void ResolveMethodTokenMethodBuilder ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder moduleb = ab.DefineDynamicModule ("foo.dll", "foo.dll");

			TypeBuilder tb = moduleb.DefineType ("foo");
			MethodBuilder mb = tb.DefineMethod("Frub", MethodAttributes.Static, null, new Type[] { typeof(IntPtr) });
			int tok = mb.GetToken().Token;
			mb.SetImplementationFlags(MethodImplAttributes.NoInlining);
			ILGenerator ilgen = mb.GetILGenerator();
			ilgen.Emit(OpCodes.Ret);

			tb.CreateType ();

			MethodBase mi = moduleb.ResolveMethod (tok);
			Assert.IsNotNull (mi);
			Assert.AreEqual ("Frub", mi.Name);
		}
#endif

		[Test]
		public void GetTypes ()
		{
			AssemblyBuilder ab = genAssembly ();
			ModuleBuilder mb = ab.DefineDynamicModule ("foo.dll", "foo.dll");
			
            TypeBuilder tb1 = mb.DefineType("Foo", TypeAttributes.Public);
			
			Type[] types = mb.GetTypes ();
			Assert.AreEqual (1, types.Length);
			Assert.AreEqual (tb1, types [0]);

			// After the type is created, MS seems to return the created type
			tb1.CreateType ();

			types = mb.GetTypes ();
			Assert.AreEqual (tb1.CreateType (), types [0]);
		}
	}
}