using System;
using System.Collections.Generic;
 
namespace DoFactory.GangOfFour.Bridge.RealWorld
{
  /// 

  /// MainApp startup class for Real-World 
  /// Bridge Design Pattern.
  /// 

  class MainApp
  {
    /// 

    /// Entry point into console application.
    /// 
    static void Main()
    {
      // Create RefinedAbstraction
      Customers customers = new Customers("Chicago");
 
      // Set ConcreteImplementor
      customers.Data = new CustomersData();
 
      // Exercise the bridge
      customers.Show();
      customers.Next();
      customers.Show();
      customers.Next();
      customers.Show();
      customers.Add("Henry Velasquez");
 
      customers.ShowAll();
 
      // Wait for user
      Console.ReadKey();
    }
  }
 
  /// 

  /// The 'Abstraction' class
  /// 
  class CustomersBase
  {
    private DataObject _dataObject;
    protected string group;
 
    public CustomersBase(string group)
    {
      this.group = group;
    }
 
    // Property
    public DataObject Data
    {
      set { _dataObject = value; }
      get { return _dataObject; }
    }
 
    public virtual void Next()
    {
      _dataObject.NextRecord();
    }
 
    public virtual void Prior()
    {
      _dataObject.PriorRecord();
    }
 
    public virtual void Add(string customer)
    {
      _dataObject.AddRecord(customer);
    }
 
    public virtual void Delete(string customer)
    {
      _dataObject.DeleteRecord(customer);
    }
 
    public virtual void Show()
    {
      _dataObject.ShowRecord();
    }
 
    public virtual void ShowAll()
    {
      Console.WriteLine("Customer Group: " + group);
      _dataObject.ShowAllRecords();
    }
  }
 
  /// 

  /// The 'RefinedAbstraction' class
  /// 

  class Customers : CustomersBase
  {
    // Constructor
    public Customers(string group)
      : base(group)
    {
    }
 
    public override void ShowAll()
    {
      // Add separator lines
      Console.WriteLine();
      Console.WriteLine("------------------------");
      base.ShowAll();
      Console.WriteLine("------------------------");
    }
  }
 
  /// 

  /// The 'Implementor' abstract class
  /// 

  abstract class DataObject
  {
    public abstract void NextRecord();
    public abstract void PriorRecord();
    public abstract void AddRecord(string name);
    public abstract void DeleteRecord(string name);
    public abstract void ShowRecord();
    public abstract void ShowAllRecords();
  }
 
  /// 

  /// The 'ConcreteImplementor' class
  /// 

  class CustomersData : DataObject
  {
    private List  _customers = new List ();
    private int _current = 0;
 
    public CustomersData()
    {
      // Loaded from a database 
      _customers.Add("Jim Jones");
      _customers.Add("Samual Jackson");
      _customers.Add("Allen Good");
      _customers.Add("Ann Stills");
      _customers.Add("Lisa Giolani");
    }
 
    public override void NextRecord()
    {
      if (_current <= _customers.Count - 1)
      {
        _current++;
      }
    }
 
    public override void PriorRecord()
    {
      if (_current > 0)
      {
        _current--;
      }
    }
 
    public override void AddRecord(string customer)
    {
      _customers.Add(customer);
    }
 
    public override void DeleteRecord(string customer)
    {
      _customers.Remove(customer);
    }
 
    public override void ShowRecord()
    {
      Console.WriteLine(_customers[_current]);
    }
 
    public override void ShowAllRecords()
    {
      foreach (string customer in _customers)
      {
        Console.WriteLine(" " + customer);
      }
    }
  }
}