/*
 Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
*/

// C5 example: collections of collections 2004-11-16

// Compile with 
//   csc /r:C5.dll CollectionCollection.cs 

using System;
using C5;
using SCG = System.Collections.Generic;

namespace CollectionCollection
{
  class MyTest
  {
    private static IList<int> col1 = new LinkedList<int>(),
      col2 = new LinkedList<int>(), col3 = new LinkedList<int>();

    public static void Main(String[] args) {
      ListEqualityComparers();
      IntSetSet();
      CharBagSet();
    }
      
    public static void ListEqualityComparers() {
      col1.AddAll<int>(new int[] { 7, 9, 13 });
      col2.AddAll<int>(new int[] { 7, 9, 13 });
      col3.AddAll<int>(new int[] { 9, 7, 13 });

      // Default equality and hasher == sequenced equality and hasher
      HashSet<IList<int>> hs1 = new HashSet<IList<int>>();
      Equalities("Default equality (sequenced equality)", hs1.EqualityComparer);
      hs1.Add(col1); hs1.Add(col2); hs1.Add(col3);
      Console.WriteLine("hs1.Count = {0}", hs1.Count);

      // Sequenced equality and hasher 
      SCG.IEqualityComparer<IList<int>> seqEqualityComparer
        = SequencedCollectionEqualityComparer<IList<int>, int>.Default;
      HashSet<IList<int>> hs2 = new HashSet<IList<int>>(seqEqualityComparer);
      Equalities("Sequenced equality", hs2.EqualityComparer);
      hs2.Add(col1); hs2.Add(col2); hs2.Add(col3);
      Console.WriteLine("hs2.Count = {0}", hs2.Count);

      // Unsequenced equality and hasher
      SCG.IEqualityComparer<IList<int>> unseqEqualityComparer
        = UnsequencedCollectionEqualityComparer<IList<int>, int>.Default;
      HashSet<IList<int>> hs3 = new HashSet<IList<int>>(unseqEqualityComparer);
      Equalities("Unsequenced equality", hs3.EqualityComparer);
      hs3.Add(col1); hs3.Add(col2); hs3.Add(col3);
      Console.WriteLine("hs3.Count = {0}", hs3.Count);

      // Reference equality and hasher
      SCG.IEqualityComparer<IList<int>> refEqEqualityComparer 
        = ReferenceEqualityComparer<IList<int>>.Default;
      HashSet<IList<int>> hs4 = new HashSet<IList<int>>(refEqEqualityComparer);
      Equalities("Reference equality", hs4.EqualityComparer);
      hs4.Add(col1); hs4.Add(col2); hs4.Add(col3);
      Console.WriteLine("hs4.Count = {0}", hs4.Count);
    }

    public static void Equalities(String msg, SCG.IEqualityComparer<IList<int>> equalityComparer)
    {
      Console.WriteLine("\n{0}:", msg);
      Console.Write("Equals(col1,col2)={0,-5}; ", equalityComparer.Equals(col1, col2));
      Console.Write("Equals(col1,col3)={0,-5}; ", equalityComparer.Equals(col1, col3));
      Console.WriteLine("Equals(col2,col3)={0,-5}", equalityComparer.Equals(col2, col3));
    }

    public static void IntSetSet() {
      ICollection<ISequenced<int>> outer = new HashSet<ISequenced<int>>();
      int[] ss = { 2, 3, 5, 7 };
      TreeSet<int> inner = new TreeSet<int>();
      outer.Add(inner.Snapshot());
      foreach (int i in ss) { 
        inner.Add(i);
        outer.Add(inner.Snapshot());
      }
      foreach (ISequenced<int> s in outer) {
        int sum = 0;
        s.Apply(delegate(int x) { sum += x; });
        Console.WriteLine("Set has {0} elements and sum {1}", s.Count, sum);
      }
    }

    public static void CharBagSet() { 
      String text = 
        @"three sorted streams aligned by leading masters are stored 
          there; an integral triangle ends, and stable tables keep;
          being alert, they later reread the logarithm, peek at the
          recent center, then begin to send their reader algorithm.";
      String[] words = text.Split(' ', '\n', '\r', ';', ',', '.');
      ICollection<ICollection<char>> anagrams 
        = new HashSet<ICollection<char>>();
      int count = 0;
      foreach (String word in words) {
        if (word != "") {
          count++;
          HashBag<char> anagram = new HashBag<char>();
          anagram.AddAll<char>(word.ToCharArray());
          anagrams.Add(anagram);
        }
      }
      Console.WriteLine("Found {0} anagrams", count - anagrams.Count);
    }
  }
}