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

namespace HeuristicLab.Data.MoveVectorData.Moves
{
    public struct OutgoingMove : IMove
    {
        public bool Enabled { get; set; }

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

        public bool TryParse(string s)
        {
            bool enable = false;
            if (s.StartsWith("(o") && s.EndsWith(")"))
            {
                enable = true;
            }
            else if (s.StartsWith("<o") && s.EndsWith(">"))
            {
                enable = false;
            }
            else {
                return false;
            }
            Enabled = enable;
            return true;
        }

        public void Randomize(IRandom random, int min, int max, int step = 1)
        {
            Enabled = true;
        }

        public int Apply(ref StackingArea area, ref Stack inputStack, out int realMoves)
        {
            if (Enabled)
            {
                var minValue = Int32.MaxValue;
                var minStack = Int32.MaxValue;
                var minRow = Int32.MaxValue;
                for (int stack = 0; stack < area.Size; stack++)
                {
                    for (int row = area.MaxHeight - 1; row >= 0; row--)
                    {
                        if(area[row, stack] != 0 && area[row, stack] < minValue)
                        {
                            minValue = area[row, stack];
                            minStack = stack;
                            minRow = row;
                        }
                    }
                }

                for (int stack = 0; stack < inputStack.Capacity; stack++)
                {
                    if (inputStack[stack] != 0 && inputStack[stack] < minValue)
                    {
                        realMoves = 0;
                        return 1;
                    }
                }

                if (minValue == Int32.MaxValue)
                {
                    realMoves = 0;
                    return 1;
                }

                area[minRow, minStack] = 0;
                int atop = 0;
                for (int row = minRow; row < area.MaxHeight; row++)
                {
                    if (row < area.MaxHeight - 1)
                    {
                        area[row, minStack] = area[row + 1, minStack];
                    } else
                    {
                        area[row, minStack] = 0;
                    }
                    atop = atop + 1;
                }
                realMoves = atop * 2 + 1;
                return atop * 2 + 1;
            }
            realMoves = 0;
            return 0;
        }

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