using HeuristicLab.Core;
using HeuristicLab.Data.MoveVectorData.Interfaces;
using System;
using System.Collections.Generic;
using System.Text;

namespace HeuristicLab.Data.MoveVectorData.Moves
{
    public struct TwoPointMove : IMove
    {
        public bool Enabled { get; set; }
        public int pickup;
        public int putdown;

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            if (Enabled) sb.Append("("); else sb.Append("<");
            sb.Append(pickup.ToString() + "," + putdown.ToString());
            if (Enabled) sb.Append(")"); else sb.Append(">");
            return sb.ToString();
        }

        public bool TryParse(string s)
        {
            bool enable = false;
            if (s.StartsWith("(") && s.EndsWith(")"))
            {
                enable = true;
            }
            else if (s.StartsWith("<") && s.EndsWith(">"))
            {
                enable = false;
            }
            else {
                return false;
            }
            string s1 = s.Substring(1, s.Length - 1);
            string[] valueStrings = s1.Split(',');
            if (valueStrings.Length != 2)
            {
                return false;
            }
            int valPickup;
            if (!int.TryParse(valueStrings[0], out valPickup))
            {
                return false;
            }
            int valPutdown;
            if (!int.TryParse(valueStrings[1], out valPutdown))
            {
                return false;
            }
            this.Enabled = enable;
            this.pickup = valPickup;
            this.putdown = valPutdown;
            return true;
        }

        public void Randomize(IRandom random, int min, int max, int step = 1)
        {
            int numbers = (int)Math.Floor((max - min) / (double)step);
            do
            {
                pickup = random.Next(numbers) * step + min;
                putdown = random.Next(numbers) * step + min;
            } while (pickup == putdown);
            Enabled = true;
        }

        public int Apply(ref StackingArea area, ref Stack inputStack, out int realMoves)
        {
            if (!Enabled)
            {
                realMoves = 0;
                return 0;
            }
            if (area[putdown].CurrentHeight < area[putdown].Length &&
                area[pickup].CurrentHeight > 0)
            {
                int pick = area[pickup].Pop();
                area[putdown].Push(pick);
                realMoves = 1;
                return 2;
            }
            realMoves = 0;
            return 1;
        }

        public IEnumerable<IMove> GenerateNeighbours(IRandom random, int min, int max, int step = 1)
        {
            var moves = new List<IMove>();
            moves.Add(new TwoPointMove() { Enabled = !this.Enabled, putdown = this.putdown, pickup = this.pickup });

            /* 
            int numbers = (int)Math.Floor((max - min) / (double)step);
            int newPickup;
            int newPutdown;
            do
            {
                newPickup = random.Next(numbers) * step + min;
                putdown = random.Next(numbers) * step + min;
            } while (newPickup == putdown);
            do
            {
                pickup = random.Next(numbers) * step + min;
                newPutdown = random.Next(numbers) * step + min;
            } while (pickup == newPutdown);

            moves.Add(new TwoPointMove() { Enabled = true, putdown = newPutdown, pickup = this.pickup });
            moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown, pickup = newPickup });
            */

            for(int i = min; i < max; i++)
            {
                moves.Add(new TwoPointMove() { Enabled = true, putdown = i, pickup = this.pickup });
                moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown, pickup = i });
            }

            /*
            if (putdown + step <= max)
                moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown + step, pickup = this.pickup });
            if (putdown - step >= min)
                moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown - step, pickup = this.pickup });
            if (pickup + step <= max)
                moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown, pickup = this.pickup + step });
            if (pickup - step >= min)
                moves.Add(new TwoPointMove() { Enabled = true, putdown = this.putdown, pickup = this.pickup - step  });*/
            return moves;
        }
    }
}