#region License Information
/* HeuristicLab
 * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab 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.
 *
 * HeuristicLab 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 HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;

namespace HeuristicLab.Common {
  public static class TypeExtensions {
    public static string GetPrettyName(this Type x) {
      return x.GetPrettyName(false);
    }
    public static string GetPrettyName(this Type x, bool includeNamespace) {
      StringBuilder sb = new StringBuilder();
      if ((includeNamespace) && !string.IsNullOrEmpty(x.Namespace))
        sb.Append(x.Namespace).Append(".");
      sb.Append(x.Name);
      if (x.IsGenericType) {
        Type[] genericParams = x.GetGenericArguments();
        sb.Remove(sb.ToString().LastIndexOf('`'), genericParams.Length.ToString().Length + 1);
        sb.Append("<");
        for (int i = 0; i < genericParams.Length; i++) {
          if (i > 0) sb.Append(", ");
          sb.Append(genericParams[i].GetPrettyName(includeNamespace));
        }
        sb.Append(">");
      }
      return sb.ToString();
    }

    public static IEnumerable<FieldInfo> GetAllFields(this Type type) {
      while (type != null) {
        foreach (var field in type.GetFields(BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic))
          yield return field;
        type = type.BaseType;
      }
    }

    // http://stackoverflow.com/questions/457676/c-reflection-check-if-a-class-is-derived-from-a-generic-class
    public static bool IsSubclassOfRawGeneric(this Type toCheck, Type generic) {
      while (toCheck != typeof(object)) {
        var cur = toCheck.IsGenericType ? toCheck.GetGenericTypeDefinition() : toCheck;
        if (generic == cur) {
          return true;
        }
        toCheck = toCheck.BaseType; // baseType is null when toCheck is an Interface
        if (toCheck == null)
          return false;
      }
      return false;
    }
  }
}