using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;

namespace Server
{
  public class NameList
  {
    public string Type { get; }

    public string[] List { get; }

    public bool ContainsName(string name)
    {
      for (int i = 0; i < List.Length; i++)
        if (name == List[i])
          return true;

      return false;
    }

    public NameList(string type, XmlElement xml)
    {
      Type = type;
      List = xml.InnerText.Split(',');

      for (int i = 0; i < List.Length; ++i)
        List[i] = Utility.Intern(List[i].Trim());
    }

    public string GetRandomName()
    {
      if (List.Length > 0)
        return List[Utility.Random(List.Length)];

      return "";
    }

    public static NameList GetNameList(string type)
    {
      m_Table.TryGetValue(type, out NameList n);
      return n;
    }

    public static string RandomName(string type) => GetNameList(type)?.GetRandomName() ?? "";

    private static readonly Dictionary<string, NameList> m_Table;

    static NameList()
    {
      m_Table = new Dictionary<string, NameList>(StringComparer.OrdinalIgnoreCase);

      string filePath = Path.Combine(Core.BaseDirectory, "Data/names.xml");

      if (!File.Exists(filePath))
        return;

      try
      {
        Load(filePath);
      }
      catch (Exception e)
      {
        Console.WriteLine("Warning: Exception caught loading name lists:");
        Console.WriteLine(e);
      }
    }

    private static void Load(string filePath)
    {
      XmlDocument doc = new XmlDocument();
      doc.Load(filePath);

      XmlElement root = doc["names"];

      foreach (XmlElement element in root.GetElementsByTagName("namelist"))
      {
        string type = element.GetAttribute("type");

        if (string.IsNullOrEmpty(type))
          continue;

        try
        {
          NameList list = new NameList(type, element);

          m_Table[type] = list;
        }
        catch
        {
          // ignored
        }
      }
    }
  }
}