using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CDSAE3_Lian_Lian_Kan.Boards
{
    internal class Board_funcs
    {
        private Random random = new Random();
        internal int getval(ref int[] temp_val_per_Image, ref int last_val, int types)
        {
            int not_zero = 0;
            foreach (int x in temp_val_per_Image)
                if (x != 0)
                {
                    not_zero++;
                    if (not_zero > 1)
                        break;
                }
            if (not_zero <= 1)
            {
                int k = 0;
                for (int i = 0; i < temp_val_per_Image.Length; i++)
                    if (temp_val_per_Image[i] != 0)
                    {
                        k = i;
                        break;
                    }
                temp_val_per_Image[k]--;
                return k;
            }
            int t = random.Next(0, types);
            if (temp_val_per_Image[t] <= 0 || t == last_val)
            {
                int i = (t + 1) % types;
                for (; temp_val_per_Image[i] <= 0 || i == last_val; i %= types)
                    i++;
                temp_val_per_Image[i]--;
                last_val = i;
                return i;
            }
            temp_val_per_Image[t]--;
            last_val = t;
            return t;
        }
        internal int[] get_vals_per_image(int total, int type_num)
        {
            int[] vals_per_Image = new int[type_num];
            int single = total / type_num;
            for (int k = total; k > 0; k -= 2)
            {
                int t = random.Next(0, type_num);
                if (vals_per_Image[t] >= 1.5 * single && single != 0)
                {
                    k += 2;
                    continue;
                }
                vals_per_Image[t] += 2;
            }
            return vals_per_Image;
        }
    }
}