using CzokoŚmieciarka.MonoGameView.DataModels.Enums;
using CzokoŚmieciarka.MonoGameView.DataModels.Interfaces;
using CzokoŚmieciarka.MonoGameView.DataModels.Interfaces.GarbageCollector;
using CzokoŚmieciarka.MonoGameView.DataModels.Interfaces.TrashCans;
using CzokoŚmieciarka.MonoGameView.DataModels.Models;
using CzokoŚmieciarka.MonoGameView.DataModels.Models.Steps;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xna.Framework.Content;

namespace CzokoŚmieciarka.MonoGameView.Algorithms
{
    public class DFS
    {
        public DFS()
        {
        }
        int count = 0;


        public List<IStep> BestPath(ContentManager content, AGarbageCollector collector, object[,] grid)
        {
            var r=Search(content, collector, grid, 0).Key;
            Console.WriteLine(count);
            if (r == null) return new List<IStep>();
            return r;
        }

        List<IStep> PossibleSteps(ContentManager content, AGarbageCollector collector, object[,] grid)
        {


            var result = new List<IStep>();
            var moveSteps = new List<IStep>()
            {
                new MoveStep(Direction.Up),
                new MoveStep(Direction.Down),
                new MoveStep(Direction.Left),
                new MoveStep(Direction.Right)
            };
            var filteredMoveSteps = new List<IStep>();
            foreach (var item in moveSteps)
            {
                var copyCollector = (AGarbageCollector)collector.Clone(content);
                var copyGrid = (object[,])grid.Clone();
                try
                {
                    item.Invoke(copyCollector, grid);
                    var gcx = copyCollector.Coords.X;
                    var gcy = copyCollector.Coords.Y;
                    if (grid[gcx, gcy] is IRoad1 || grid[gcx, gcy] is IGarbageLocalization || grid[gcx, gcy] is ADump)
                    {
                        result.Add(item);
                    }
                }
                catch (Exception e)
                {

                }
            }

            return result;
        }

        KeyValuePair<List<IStep>, int> Search(ContentManager content, AGarbageCollector collector, object[,] grid, int length)
        {
            count++;
            if (length > 40) return new KeyValuePair<List<IStep>, int>(new List<IStep>(), length);
            var possibleSteps = PossibleSteps(content, collector, grid);
                                   
            foreach (var item in possibleSteps)
            {
                var copyCollector = (AGarbageCollector)collector.Clone(content);
                var copyGrid = (object[,])grid.Clone();


                //if (copyGrid[copyCollector.Coords.X, copyCollector.Coords.Y] is IRoad1) copyGrid[copyCollector.Coords.X, copyCollector.Coords.Y] = new Road2();
                item.Invoke(copyCollector, copyGrid);
                var s = Search(content, copyCollector, copyGrid, length + 1);
                if (s.Key != null)
                {
                    s.Key.Insert(0, item);
                    return s;
                }
            }
            return new KeyValuePair<List<IStep>, int>(null, length);
            /*var min = int.MaxValue;
            var min_index = 0;
            for (int i = 0; i < mapped.Count; i++)
            {
                if (mapped.ElementAt(i).Value <= min)
                {
                    min = mapped.ElementAt(i).Value;
                    min_index = i;
                }
            }
            return mapped.ElementAt(min_index);
            */


        }
    }
}