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

namespace ConsoleApp1
{
    public class MatrixService
    {

        static readonly Random rand = new Random();

        public int[,] RandomGenerateMatrix(int dimensionsCount)
        {
            int[,] result = new int[dimensionsCount, dimensionsCount];
            for (int i = 0; i < dimensionsCount; i++)
            {
                for (int j = 0; j < dimensionsCount; j++)
                {
                    result[i, j] = rand.Next(1000);
                }
            }
            return result;
        }

        public int[,] MultiplicationMatrix(int[,] matrix1, int[,] matrix2, int threadCount)
        {
            var result = new int[matrix1.GetLength(0), matrix1.GetLength(1)];
            for(int i = 0; i < result.GetLength(0); i++)
            {
                for (int j = 0; j < result.GetLength(1); j++)
                {
                    result[i, j] = 0;
                }
            }

            for (int i = 0; i < matrix1.GetLength(0); i++)
            {
                Parallel.For(0, matrix2.GetLength(1), new ParallelOptions() { MaxDegreeOfParallelism = threadCount },
                    (j) =>
                {

                    for (int k = 0; k < matrix2.GetLength(0); k++)
                    {
                        var value = matrix1[i, k] * matrix2[k, j];
                        Interlocked.Add(ref result[i, j], value);
                    }
                });
            }

            return result;
        }
    }
}