namespace FeedbackGeneratorQQ.Utils
{
   using System.Collections.Generic;
   using System.IO;
   using System.Linq;
   using System.Threading.Tasks;

   using FeedbackGeneratorQQ.Models;

   public static class AttributesHelper
   {
      /// <summary>
      /// Default attributes root folder
      /// </summary>
      private const string _attributesFolder = "AttributeTemplates";

      /// <summary>
      /// Default template name
      /// </summary>
      private const string _templateName = "Template.xml";

      /// <summary>
      /// Default template root node
      /// </summary>
      public const string TemplateRootNode = "Template";

      /// <summary>
      /// %sheHe% and %heShe% replacer
      /// </summary>
      private static string _sheHeReplacer;

      /// <summary>
      /// %SheHe% and %HeShe% replacer
      /// </summary>
      private static string _sheHeUpperReplacer;

      /// <summary>
      /// %himHer% and %herHim% replacer
      /// </summary>
      private static string _himHerReplacer;

      /// <summary>
      /// %himselfHerself% and %herselfHimself% replacer
      /// </summary>
      private static string _himselfHerselfReplacer;

      /// <summary>
      /// %hisHer% and %herHis% replacer
      /// </summary>
      private static string _hisHerReplacer;

      /// <summary>
      /// %HisHer% and %HerHis% replacer
      /// </summary>
      private static string _hisHerUpperReplacer;

      private static string GetAppPath()
      {
         return System.AppDomain.CurrentDomain.BaseDirectory;
      }

      private static string GetAttributesFolderPath()
      {
         return Path.Combine(GetAppPath(), _attributesFolder);
      }

      public static string GetAttributePath(string attributeFolder)
      {
         return Path.Combine(attributeFolder, _templateName);
      }

      /// <summary>
      /// Gets attributes and their content
      /// </summary>
      /// <returns> Returns list of attributes (Task) </returns>
      public static Task<IEnumerable<AttributeModel>> GetAttributesAsync()
      {
         return Task.Factory.StartNew(() =>
         {
            return Directory.EnumerateDirectories(GetAttributesFolderPath(), "*", SearchOption.TopDirectoryOnly)
               .Select(path => new AttributeModel(path))
               .Where(attributeModel => attributeModel.Types.Any());
         });
      }

      /// <summary>
      /// Configures replacers based on selected gender
      /// </summary>
      /// <param name="gender"> The gender </param>
      public static void ConfigureReplacers(string gender)
      {
         bool isMale = gender.Equals("Male");
         _sheHeReplacer = isMale ? "he" : "she";
         _sheHeUpperReplacer = isMale ? "He" : "She";
         _himHerReplacer = isMale ? "him" : "her";
         _himselfHerselfReplacer = isMale ? "himself" : "herself";
         _hisHerReplacer = isMale ? "his" : "her";
         _hisHerUpperReplacer = isMale ? "His" : "Her";
      }

      /// <summary>
      /// Replaces all known replacers into the given message
      /// </summary>
      /// <param name="inputMessage"> The input message </param>
      /// <param name="firstName"> The first name </param>
      /// <param name="lastName"> The last name </param>
      /// <returns> Returns updated message </returns>
      public static string ApplyReplacers(
         string inputMessage,
         string firstName,
         string lastName)
      {
         return inputMessage
            .Replace("%UserName%", $"{firstName} {lastName}")
            .Replace("%LastName%", lastName)
            .Replace("%FirstName%", firstName)
            .Replace("%SheHe%", _sheHeUpperReplacer)
            .Replace("%HeShe%", _sheHeUpperReplacer)
            .Replace("%sheHe%", _sheHeReplacer)
            .Replace("%heShe%", _sheHeReplacer)
            .Replace("%himHer%", _himHerReplacer)
            .Replace("%herHim%", _himHerReplacer)
            .Replace("%himselfHerself%", _himselfHerselfReplacer)
            .Replace("%herselfHimself%", _himselfHerselfReplacer)
            .Replace("%HisHer%", _hisHerUpperReplacer)
            .Replace("%HerHis%", _hisHerUpperReplacer)
            .Replace("%hisHer%", _hisHerReplacer)
            .Replace("%herHis%", _hisHerReplacer);
      }
   }
}