using System;

namespace DoFactory.GangOfFour.Adapter.RealWorld
{
  /// <summary>
  /// MainApp startup class for Real-World
  /// Adapter Design Pattern.
  /// </summary>
  class MainApp
  {
    /// <summary>
    /// Entry point into console application.
    /// </summary>
    static void Main()
    {
      // Non-adapted chemical compound
      Compound unknown = new Compound("Unknown");
      unknown.Display();

      // Adapted chemical compounds
      Compound water = new RichCompound("Water");
      water.Display();

      Compound benzene = new RichCompound("Benzene");
      benzene.Display();

      Compound ethanol = new RichCompound("Ethanol");
      ethanol.Display();

      // Wait for user
      Console.ReadKey();
    }
  }

  /// <summary>
  /// The 'Target' class
  /// </summary>
  class Compound
  {
    protected string _chemical;
    protected float _boilingPoint;
    protected float _meltingPoint;
    protected double _molecularWeight;
    protected string _molecularFormula;

    // Constructor
    public Compound(string chemical)
    {
      this._chemical = chemical;
    }

    public virtual void Display()
    {
      Console.WriteLine("\nCompound: {0} ------ ", _chemical);
    }
  }

  /// <summary>
  /// The 'Adapter' class
  /// </summary>
  class RichCompound : Compound
  {
    private ChemicalDatabank _bank;

    // Constructor
    public RichCompound(string name)
      : base(name)
    {
    }

    public override void Display()
    {
      // The Adaptee
      _bank = new ChemicalDatabank();

      _boilingPoint = _bank.GetCriticalPoint(_chemical, "B");
      _meltingPoint = _bank.GetCriticalPoint(_chemical, "M");
      _molecularWeight = _bank.GetMolecularWeight(_chemical);
      _molecularFormula = _bank.GetMolecularStructure(_chemical);

      base.Display();
      Console.WriteLine(" Formula: {0}", _molecularFormula);
      Console.WriteLine(" Weight : {0}", _molecularWeight);
      Console.WriteLine(" Melting Pt: {0}", _meltingPoint);
      Console.WriteLine(" Boiling Pt: {0}", _boilingPoint);
    }
  }

  /// <summary>
  /// The 'Adaptee' class
  /// </summary>
  class ChemicalDatabank
  {
    // The databank 'legacy API'
    public float GetCriticalPoint(string compound, string point)
    {
      // Melting Point
      if (point == "M")
      {
        switch (compound.ToLower())
        {
          case "water": return 0.0f;
          case "benzene": return 5.5f;
          case "ethanol": return -114.1f;
          default: return 0f;
        }
      }
      // Boiling Point
      else
      {
        switch (compound.ToLower())
        {
          case "water": return 100.0f;
          case "benzene": return 80.1f;
          case "ethanol": return 78.3f;
          default: return 0f;
        }
      }
    }

    public string GetMolecularStructure(string compound)
    {
      switch (compound.ToLower())
      {
        case "water": return "H20";
        case "benzene": return "C6H6";
        case "ethanol": return "C2H5OH";
        default: return "";
      }
    }

    public double GetMolecularWeight(string compound)
    {
      switch (compound.ToLower())
      {
        case "water": return 18.015;
        case "benzene": return 78.1134;
        case "ethanol": return 46.0688;
        default: return 0d;
      }
    }
  }
}