Array Manipulator

using System;
using System.Collections.Generic;
using System.Linq;

namespace _02.ArrayManipulator
{
    class ArrayManipulator
    {
        static void Main()
        {
            int[] array = Console.ReadLine().Split(new[] { " " },
                                             StringSplitOptions.RemoveEmptyEntries).
                                             Select(int.Parse).ToArray();
            string input = Console.ReadLine();

            int leng = array.Length;

            while (input != "end")
            {
                string[] command = input.Split(new[] { " "},
                                               StringSplitOptions.RemoveEmptyEntries);

                if(command[0] == "exchange")
                {
                    int index = int.Parse(command[1]);
                    if(index >= leng || index < 0)
                    {
                        Console.WriteLine("Invalid index");
                    }
                    else
                    {
                        array = ExchangeArray(array, index);
                    }
                }
                else if (command[0] == "max")
                {
                    string type = command[1];

                    int max = ReturnMaxNumberOfType(array, type);

                    if(max == -1)
                    {
                        Console.WriteLine("No matches");
                    }
                    else
                    {
                        Console.WriteLine("{0}", max);
                    }
                }
                else if (command[0] == "min")
                {
                    string type = command[1];

                    int min = ReturnMinNumberOfType(array, type);

                    if (min == -1)
                    {
                        Console.WriteLine("No matches");
                    }
                    else
                    {
                        Console.WriteLine("{0}", min);
                    }
                }
                else if (command[0] == "first")
                {
                    int count = int.Parse(command[1]);
                    string type = command[2];

                    if(count > leng)
                    {
                        Console.WriteLine("Invalid count");
                    }
                    else
                    {
                        GetFirstCountNumbersOfType(array, count, type);
                    }
                }
                else if (command[0] == "last")
                {
                    int count = int.Parse(command[1]);
                    string type = command[2];

                    if (count > leng)
                    {
                        Console.WriteLine("Invalid count");
                    }
                    else
                    {
                        GetLastCountNumbersOfType(array, count, type);
                    }
                }
                input = Console.ReadLine();
            }

            Console.WriteLine("[{0}]", String.Join(", ", array));
        }

        static int[] ExchangeArray(int[] array, int index)
        {
            var newList = new List<int>();

            for (int pos = index + 1; pos < array.Length; pos++)
            {
                newList.Add(array[pos]);
            }

            for (int pos = 0; pos < index + 1; pos++)
            {
                newList.Add(array[pos]);
            }

            return newList.ToArray();
        }

        static int ReturnMaxNumberOfType(int[] array, string type)
        {
            int maxEven = int.MinValue;
            int maxOdd = int.MinValue;
            int indexMaxEven = 0;
            int indexMaxOdd = 0;

            for (int index = 0; index < array.Length; index++)
            {
                int number = array[index];

                if(number % 2 == 0)
                {
                    if(number >= maxEven)
                    {
                        maxEven = number;
                        indexMaxEven = index;
                    }
                }
                else
                {
                    if (number >= maxOdd)
                    {
                        maxOdd = number;
                        indexMaxOdd = index;
                    }
                }
            }

            if(type == "even")
            {
                if(maxEven == int.MinValue)
                {
                    return -1;
                }
                return indexMaxEven;
            }
            else
            {
                if (maxOdd == int.MinValue)
                {
                    return -1;
                }
                return indexMaxOdd;
            }
        }

        static int ReturnMinNumberOfType(int[] array, string type)
        {
            int minEven = int.MaxValue;
            int minOdd = int.MaxValue;
            int indexMinEven = 0;
            int indexMinOdd = 0;

            for (int index = 0; index < array.Length; index++)
            {
                int number = array[index];

                if (number % 2 == 0)
                {
                    if (number <= minEven)
                    {
                        minEven = number;
                        indexMinEven = index;
                    }
                }
                else
                {
                    if (number <= minOdd)
                    {
                        minOdd = number;
                        indexMinOdd = index;
                    }
                }
            }

            if (type == "even")
            {
                if (minEven == int.MaxValue)
                {
                    return -1;
                }
                return indexMinEven;
            }
            else
            {
                if (minOdd == int.MaxValue)
                {
                    return -1;
                }
                return indexMinOdd;
            }
        }

        static void GetFirstCountNumbersOfType(int[] array, int count,string type)
        {
            if(type == "even")
            {
                int[] arrayOfEvens = GetGroupedElementsByType(array).Item2;

                if(arrayOfEvens.Length == 0)
                {
                    Console.WriteLine("[]");
                }
                else
                {
                    if(count >= arrayOfEvens.Length)
                    {
                        Console.WriteLine("[{0}]", String.Join(", ",arrayOfEvens));
                    }
                    else
                    {
                        Console.WriteLine("[{0}]", String.Join(", ", arrayOfEvens.Take(count)));
                    }
                }
            }
            else
            {
                int[] arrayOfOdds = GetGroupedElementsByType(array).Item1;

                if (arrayOfOdds.Length == 0)
                {
                    Console.WriteLine("[]");
                }
                else
                {
                    if (count >= arrayOfOdds.Length)
                    {
                        Console.WriteLine("[{0}]", String.Join(", ", arrayOfOdds));
                    }
                    else
                    {
                        Console.WriteLine("[{0}]", String.Join(", ", arrayOfOdds.Take(count)));
                    }
                }
            }
        }

        static void GetLastCountNumbersOfType(int[] array, int count, string type)
        {
            if (type == "even")
            {
                int[] arrayOfEvens = GetGroupedElementsByType(array).Item2;

                if (arrayOfEvens.Length == 0)
                {
                    Console.WriteLine("[]");
                }
                else
                {
                    if (count >= arrayOfEvens.Length)
                    {
                        Console.WriteLine("[{0}]", String.Join(", ", arrayOfEvens));
                    }
                    else
                    {
                        Console.WriteLine("[{0}]",
                            String.Join(", ", arrayOfEvens.Skip(arrayOfEvens.Length - count).Take(count)));
                    }
                }
            }
            else
            {
                int[] arrayOfOdds = GetGroupedElementsByType(array).Item1;

                if (arrayOfOdds.Length == 0)
                {
                    Console.WriteLine("[]");
                }
                else
                {
                    if (count >= arrayOfOdds.Length)
                    {
                        Console.WriteLine("[{0}]", String.Join(", ", arrayOfOdds));
                    }
                    else
                    {
                        Console.WriteLine("[{0}]",
                            String.Join(", ", arrayOfOdds.Skip(arrayOfOdds.Length - count).Take(count)));
                    }
                }
            }
        }

        static Tuple<int[],int[]> GetGroupedElementsByType(int[] array)
        {
            var oddElements = new List<int>();
            var evenElements = new List<int>();
            for (int index = 0; index < array.Length; index++)
            {
                int number = array[index];

                if(number % 2 == 1)
                {
                    oddElements.Add(number);
                }
                else
                {
                    evenElements.Add(number);
                }
            }
            return new Tuple<int[],int[]>(oddElements.ToArray(), evenElements.ToArray());
        }
    }
}