//
// Mono.CSharp CSharpCodeCompiler Class implementation
//
// Authors:
//	Sean Kasun (seank@users.sf.net)
//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// Copyright (c) Novell, Inc. (http://www.novell.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

namespace Mono.CSharp
{
	using System;
	using System.CodeDom;
	using System.CodeDom.Compiler;
	using System.IO;
	using System.Text;
	using System.Reflection;
	using System.Collections;
	using System.Collections.Specialized;
	using System.Diagnostics;
	using System.Text.RegularExpressions;

	internal class CSharpCodeCompiler : CSharpCodeGenerator, ICodeCompiler
	{
		static string windowsMcsPath;
		static string windowsMonoPath;

		static CSharpCodeCompiler ()
		{
			if (Path.DirectorySeparatorChar == '\\') {
				// FIXME: right now we use "fixed" version 1.0
				// mcs at any time.
				PropertyInfo gac = typeof (Environment).GetProperty ("GacPath", BindingFlags.Static|BindingFlags.NonPublic);
				MethodInfo get_gac = gac.GetGetMethod (true);
				string p = Path.GetDirectoryName (
					(string) get_gac.Invoke (null, null));
				windowsMonoPath = Path.Combine (
					Path.GetDirectoryName (
						Path.GetDirectoryName (p)),
					"bin\\mono.bat");
				if (!File.Exists (windowsMonoPath))
					windowsMonoPath = Path.Combine (
						Path.GetDirectoryName (
							Path.GetDirectoryName (p)),
						"bin\\mono.exe");
				windowsMcsPath =
					Path.Combine (p, "1.0\\mcs.exe");
			}
		}

		//
		// Constructors
		//
		public CSharpCodeCompiler()
		{
		}

		//
		// Methods
		//
		[MonoTODO]
		public CompilerResults CompileAssemblyFromDom (
			CompilerParameters options,CodeCompileUnit e)
		{
			return CompileAssemblyFromDomBatch(options,new CodeCompileUnit[]{e});
		}
		public CompilerResults CompileAssemblyFromDomBatch (
			CompilerParameters options,CodeCompileUnit[] ea)
		{
			string[] fileNames=new string[ea.Length];
			int i=0;
			if (options == null)
				options = new CompilerParameters ();
			
			StringCollection assemblies = options.ReferencedAssemblies;

			foreach (CodeCompileUnit e in ea) {
				fileNames [i] = GetTempFileNameWithExtension (options.TempFiles, i.ToString () + ".cs");
				FileStream f=new FileStream(fileNames[i],FileMode.OpenOrCreate);
				StreamWriter s=new StreamWriter(f, Encoding.UTF8);
				if (e.ReferencedAssemblies != null) {
					foreach (string str in e.ReferencedAssemblies) {
						if (!assemblies.Contains (str))
							assemblies.Add (str);
					}
				}

				((ICodeGenerator)this).GenerateCodeFromCompileUnit (e, s, new CodeGeneratorOptions());
				s.Close();
				f.Close();
				i++;
			}
			return CompileAssemblyFromFileBatch (options, fileNames);
		}
		
		public CompilerResults CompileAssemblyFromFile (
			CompilerParameters options,string fileName)
		{
			return CompileAssemblyFromFileBatch (options, new string []{fileName});
		}

		public CompilerResults CompileAssemblyFromFileBatch (CompilerParameters options, string[] fileNames)
		{
			if (null == options)
				throw new ArgumentNullException("options");
			if (null == fileNames)
				throw new ArgumentNullException("fileNames");

			CompilerResults results=new CompilerResults(options.TempFiles);
			Process mcs=new Process();

			string mcs_output;
			string[] mcs_output_lines;
			// FIXME: these lines had better be platform independent.
			if (Path.DirectorySeparatorChar == '\\') {
				mcs.StartInfo.FileName = windowsMonoPath;
				mcs.StartInfo.Arguments = windowsMcsPath + ' ' + BuildArgs (options, fileNames);
			}
			else {
#if NET_2_0
				// FIXME: This is a temporary hack to make code genaration work in 2.0
				mcs.StartInfo.FileName="gmcs";
#else
				mcs.StartInfo.FileName="mcs";
#endif
				mcs.StartInfo.Arguments=BuildArgs(options,fileNames);
			}
			mcs.StartInfo.CreateNoWindow=true;
			mcs.StartInfo.UseShellExecute=false;
			mcs.StartInfo.RedirectStandardOutput=true;
			try {
				mcs.Start();
				mcs_output=mcs.StandardOutput.ReadToEnd();
				mcs.WaitForExit();
			} finally {
				results.NativeCompilerReturnValue = mcs.ExitCode;
				mcs.Close();
			}
			mcs_output_lines=mcs_output.Split(
				System.Environment.NewLine.ToCharArray());
			bool loadIt=true;
			foreach (string error_line in mcs_output_lines)
			{
				CompilerError error=CreateErrorFromString(error_line);
				if (null!=error)
				{
					results.Errors.Add(error);
					if (!error.IsWarning) loadIt=false;
				}
			}
			if (loadIt)
				results.CompiledAssembly=Assembly.LoadFrom(options.OutputAssembly);
			else
				results.CompiledAssembly=null;

			return results;
		}
		public CompilerResults CompileAssemblyFromSource (
			CompilerParameters options,string source)
		{
			return CompileAssemblyFromSourceBatch(options,new string[]{source});
		}
		public CompilerResults CompileAssemblyFromSourceBatch (
			CompilerParameters options,string[] sources)
		{
			string[] fileNames=new string[sources.Length];
			int i=0;
			foreach (string source in sources) {
				fileNames [i] = GetTempFileNameWithExtension (options.TempFiles, i.ToString () + ".cs");
				FileStream f=new FileStream(fileNames[i],FileMode.OpenOrCreate);
				StreamWriter s=new StreamWriter(f);
				s.Write(source);
				s.Close();
				f.Close();
				i++;
			}
			return CompileAssemblyFromFileBatch (options, fileNames);
		}
		private static string BuildArgs(
			CompilerParameters options,string[] fileNames)
		{
			StringBuilder args=new StringBuilder();
			if (options.GenerateExecutable)
				args.AppendFormat("/target:exe ");
			else
				args.AppendFormat("/target:library ");
			if (options.IncludeDebugInformation)
				args.AppendFormat("/debug ");
			if (options.TreatWarningsAsErrors)
				args.AppendFormat("/warnaserror ");

			if (options.WarningLevel != -1)
				args.AppendFormat ("/warn:{0} ", options.WarningLevel);

			if (options.OutputAssembly==null)
				options.OutputAssembly = GetTempFileNameWithExtension (options.TempFiles, "dll");
			args.AppendFormat("/out:\"{0}\" ",options.OutputAssembly);
			if (null != options.ReferencedAssemblies)
			{
				foreach (string import in options.ReferencedAssemblies)
					args.AppendFormat("/r:\"{0}\" ",import);
			}
			
			args.Append (" -- ");
			foreach (string source in fileNames)
				args.AppendFormat("\"{0}\" ",source);
			return args.ToString();
		}
		private static CompilerError CreateErrorFromString(string error_string)
		{
			// When IncludeDebugInformation is true, prevents the debug symbols stats from braeking this.
			if (error_string.StartsWith ("WROTE SYMFILE") || error_string.StartsWith ("OffsetTable"))
				return null;

			CompilerError error=new CompilerError();
			Regex reg = new Regex (@"^(\s*(?<file>.*)\((?<line>\d*)(,(?<column>\d*))?\)\s+)*(?<level>\w+)\s*(?<number>.*):\s(?<message>.*)",
				RegexOptions.Compiled | RegexOptions.ExplicitCapture);
			Match match=reg.Match(error_string);
			if (!match.Success) return null;
			if (String.Empty != match.Result("${file}"))
				error.FileName=match.Result("${file}");
			if (String.Empty != match.Result("${line}"))
				error.Line=Int32.Parse(match.Result("${line}"));
			if (String.Empty != match.Result("${column}"))
				error.Column=Int32.Parse(match.Result("${column}"));
			if (match.Result("${level}")=="warning")
				error.IsWarning=true;
			error.ErrorNumber=match.Result("${number}");
			error.ErrorText=match.Result("${message}");
			return error;
		}

		static string GetTempFileNameWithExtension (TempFileCollection temp_files, string extension)
		{
			return temp_files.AddExtension (extension);
		}
	}
}