/*
    Copyright (C) 2014-2019 de4dot@gmail.com

    This file is part of dnSpy

    dnSpy is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    dnSpy is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with dnSpy.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using dnSpy.Contracts.Debugger.StartDebugging;
using dnSpy.Debugger.DotNet.CorDebug.Utilities;

namespace dnSpy.Debugger.DotNet.CorDebug.Impl {
	[ExportDbgProcessStarter(PredefinedDbgProcessStarterOrders.DotNet)]
	sealed class DotNetDbgProcessStarter : DbgProcessStarter {
		string? GetPathToDotNetExeHost() => DotNetHelpers.GetPathToDotNetExeHost(IntPtr.Size * 8);

		public override bool IsSupported(string filename, out ProcessStarterResult result) {
			result = ProcessStarterResult.None;

			if (!DotNetHelpers.IsDotNetExecutable(filename) || GetPathToDotNetExeHost() is null)
				return false;

			var extension = Path.GetExtension(filename);
			if (!StringComparer.OrdinalIgnoreCase.Equals(extension, ".exe") && !StringComparer.OrdinalIgnoreCase.Equals(extension, ".dll"))
				result |= ProcessStarterResult.WrongExtension;
			return true;
		}

		public override bool TryStart(string filename, [NotNullWhen(false)] out string? error) {
			var dotnetExeFilename = GetPathToDotNetExeHost();
			Debug2.Assert(dotnetExeFilename is not null);
			var startInfo = new ProcessStartInfo(dotnetExeFilename);
			startInfo.WorkingDirectory = Path.GetDirectoryName(filename)!;
			startInfo.Arguments = $"exec \"{filename}\"";
			startInfo.UseShellExecute = false;
			Process.Start(startInfo);
			error = null;
			return true;
		}
	}
}