/*
    Copyright (C) 2011 de4dot@gmail.com

    This file is part of de4dot.

    de4dot 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.

    de4dot 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 de4dot.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.Collections.Generic;
using System.IO;
using Mono.Cecil;

namespace de4dot {
	class AssemblyResolver : DefaultAssemblyResolver {
		public static readonly AssemblyResolver Instance = new AssemblyResolver();
		Dictionary<string, bool> addedAssemblies = new Dictionary<string, bool>(StringComparer.Ordinal);
		Dictionary<string, bool> addedDirectories = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);

		static AssemblyResolver() {
			// Make sure there's only ONE assembly resolver
			GlobalAssemblyResolver.Instance = Instance;
		}

		public void addSearchDirectory(string dir) {
			if (!addedDirectories.ContainsKey(dir)) {
				addedDirectories[dir] = true;
				AddSearchDirectory(dir);
			}
		}

		public void addModule(ModuleDefinition module) {
			var dir = Path.GetDirectoryName(module.FullyQualifiedName);
			addSearchDirectory(dir);

			var assembly = module.Assembly;
			if (assembly != null) {
				var name = assembly.Name.FullName;
				if (!addedAssemblies.ContainsKey(name) && cache.ContainsKey(name))
					throw new ApplicationException(string.Format("Assembly {0} was loaded by other code.", name));
				addedAssemblies[name] = true;
				RegisterAssembly(assembly);
			}
		}
	}
}