/*
    Copyright (C) 2011-2015 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.Collections.Generic;
using dnlib.PE;
using dnlib.DotNet.MD;
using dnlib.DotNet.Emit;
using dnlib.DotNet;
using de4dot.blocks;

namespace de4dot.code {
	public class DumpedMethodsRestorer : IRowReader<RawMethodRow>, IColumnReader, IMethodDecrypter {
		ModuleDefMD module;
		DumpedMethods dumpedMethods;

		public ModuleDefMD Module {
			set => module = value;
		}

		public DumpedMethodsRestorer(DumpedMethods dumpedMethods) => this.dumpedMethods = dumpedMethods;

		DumpedMethod GetDumpedMethod(uint rid) => dumpedMethods.Get(0x06000000 | rid);

		public bool TryReadRow(uint rid, out RawMethodRow row) {
			var dm = GetDumpedMethod(rid);
			if (dm == null) {
				row = default;
				return false;
			}
			else {
				row = new RawMethodRow(dm.mdRVA, dm.mdImplFlags, dm.mdFlags, dm.mdName, dm.mdSignature, dm.mdParamList);
				return true;
			}
		}

		public bool ReadColumn(MDTable table, uint rid, ColumnInfo column, out uint value) {
			if (table.Table == Table.Method) {
				if (TryReadRow(rid, out var row)) {
					value = row[column.Index];
					return true;
				}
			}

			value = 0;
			return false;
		}

		public bool GetMethodBody(uint rid, RVA rva, IList<Parameter> parameters, GenericParamContext gpContext, out MethodBody methodBody) {
			var dm = GetDumpedMethod(rid);
			if (dm == null) {
				methodBody = null;
				return false;
			}
			methodBody = MethodBodyReader.CreateCilBody(module, dm.code, dm.extraSections, parameters, dm.mhFlags, dm.mhMaxStack, dm.mhCodeSize, dm.mhLocalVarSigTok, gpContext);
			return true;
		}
	}
}