using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

using Model;

namespace ConsoleApp.Menu
{
    /// <summary>
    /// An utility to find a recipe.
    /// </summary>
    public class SearcherRecipe : SelectMenu<Recipe>
    {
        #region Attribute
        private RecipeCollection _recipeOnSearch;
        #endregion

        #region Properties
        /// <summary>
        /// A collection of recipe where the title contain the search string
        /// </summary>
        public RecipeCollection SearchResult { get; private set; }

        /// <summary>
        /// The search string
        /// </summary>
        public string ResearchStr { get; set; }
        #endregion

        /// <summary>
        /// Constructor of the SearcherRecipe utility.
        /// </summary>
        /// <param name="recipeOnSearch">The collection of recipe where to search</param>
        public SearcherRecipe(RecipeCollection recipeOnSearch)
        {
            _recipeOnSearch = recipeOnSearch;
            SearchResult = _recipeOnSearch;
            ResearchStr = "";
        }

        #region Methodes
        /// <summary>
        /// Launch a search by name request in the collection of Recipe with with a string.
        /// </summary>
        /// <param name="researchStr">The string for search</param>
        /// <returns>True if the result of the search gave at least 1 element. False otherwise.</returns>
        public bool ComputeSearch(string researchStr = "")
        {
            ResearchStr = researchStr;
            SearchResult = _recipeOnSearch.ResearchByName(ResearchStr.ToLower());
            _maxLines = SearchResult.Count - 1;

            return SearchResult.Count > 0;
        }

        public override void UpdateDisplay()
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("---------------------------------------------------------");
            sb.AppendLine($" Research: {ResearchStr}");
            sb.AppendLine("---------------------------------------------------------");
            for (int i = 0; i < SearchResult.Count; i++)
            {
                if (i == CurrentLine)
                {
                    CurrentSelected = SearchResult[i];
                    sb.Append($">");
                }
                sb.AppendLine($" [ {SearchResult[i].Id} ]:\t{SearchResult[i].Title} ");
            }
            Console.Clear();
            Console.WriteLine(sb);
        }

        /// <summary>
        /// Launch and pilot the search menu.
        /// </summary>
        /// <param name="recipeOnSearch">The collection of recipe where to search</param>
        /// <returns>The recipe selected</returns>
        public static Recipe? ResearchOn(RecipeCollection recipeOnSearch)
        {
            SearcherRecipe sr = new SearcherRecipe(recipeOnSearch);
            StringBuilder sb = new StringBuilder();
            sr.ComputeSearch();
            sr.UpdateDisplay();

            ConsoleKeyInfo cki;

            do
            {
                cki = Console.ReadKey(true);

                switch (cki.Key)
                {
                    case ConsoleKey.UpArrow:
                        sr.SelectPrevioustLine();
                        break;
                    case ConsoleKey.DownArrow:
                        sr.SelectNextLine();
                        break;
                    case ConsoleKey.Backspace:
                        if (sb.Length > 0)
                        {
                            sb.Remove(sb.Length - 1, 1);
                            sr.ComputeSearch(sb.ToString());
                        }
                        break;
                    default:
                        sb.Append(cki.KeyChar);
                        sr.ComputeSearch(sb.ToString());
                        break;
                }

                sr.UpdateDisplay();

            } while (cki.Key != ConsoleKey.Enter);

            return sr.CurrentSelected;
        }
        #endregion
    }
}