#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.Drawing;
using System.Linq;
using System.Reflection;
using HeuristicLab.Common;

namespace HeuristicLab.Core {
  [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
  public sealed class ItemAttribute : Attribute {
    private string name;
    public string Name {
      get { return name; }
      set { name = value == null ? string.Empty : value; }
    }
    private string description;
    public string Description {
      get { return description; }
      set { description = value == null ? string.Empty : value; }
    }
    public bool ExcludeGenericTypeInfo { get; set; }

    public ItemAttribute() : this(string.Empty, string.Empty, false) { }
    public ItemAttribute(string name, string description) : this(name, description, false) { }
    public ItemAttribute(string name, string description, bool excludeGenericTypeInfo) {
      Name = name;
      Description = description;
      ExcludeGenericTypeInfo = excludeGenericTypeInfo;
    }

    public static string GetName(Type type) {
      object[] attribs = type.GetCustomAttributes(typeof(ItemAttribute), false);
      if (attribs.Length > 0) {
        var attribute = (ItemAttribute)attribs[0];
        string name = attribute.Name;
        if (!attribute.ExcludeGenericTypeInfo && type.IsGenericType) {
          name += "<";
          Type[] typeParams = type.GetGenericArguments();
          if (typeParams.Length > 0) {
            name += GetName(typeParams[0]);
            for (int i = 1; i < typeParams.Length; i++)
              name += ", " + GetName(typeParams[i]);
          }
          name += ">";
        }
        return name;
      } else {
        return type.GetPrettyName();
      }
    }
    public static string GetDescription(Type type) {
      object[] attribs = type.GetCustomAttributes(typeof(ItemAttribute), false);
      if (attribs.Length > 0) return ((ItemAttribute)attribs[0]).Description;
      else return string.Empty;
    }
    public static Version GetVersion(Type type) {
      Assembly assembly = Assembly.GetAssembly(type);
      AssemblyFileVersionAttribute version = assembly.GetCustomAttributes(typeof(AssemblyFileVersionAttribute), true).
                                             Cast<AssemblyFileVersionAttribute>().FirstOrDefault();
      if (version != null) {
        return new Version(version.Version);
      } else {
        return assembly.GetName().Version;
      }
    }
    public static Image GetImage(Type type) {
      var staticItemImageProperty = type.GetProperty("StaticItemImage", BindingFlags.Static | BindingFlags.Public | BindingFlags.FlattenHierarchy);
      return staticItemImageProperty == null ? null : (Image)staticItemImageProperty.GetValue(null, null);
    }
  }
}