using System;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Euler.Palindrome
{
    [TestClass]
    public class Palindrome
    {
        [TestMethod]
        public void should_be_a_palindrome()
        {
            Convert.ToInt64(9889).IsPalindrome().ShouldBeTrue();
        }

        [TestMethod]
        public void should_still_be_a_palindrome()
        {

            Convert.ToInt64(98089).IsPalindrome().ShouldBeTrue();
        }

        [TestMethod]
        public void should_not_be_a_palindrome()
        {
            Convert.ToInt64(908).IsPalindrome().ShouldBeFalse();
        }

        [TestMethod]
        public void find_it()
        {
            Int64 start = 9999;
            for(Int64 product=Convert.ToInt64(9999*start); product>0;product--)
            {
                if(product.IsPalindrome())
                {
                    for (Int64 j = start; j > start-1000;j-- )
                    {
                        if (product % j == 0 && (product / j).ToString().Length.Equals(3))
                        {
                            product.Say(j, product / j);
                            return;
                        }
                    }
                }
            }
        }
    }

    public static class extensions
    {
        public static bool IsPalindrome(this Int64 number)
        {
            //var array = number.ToString().ToCharArray();
            //Array.Reverse(array);
            //return array.Equals(number.ToString().ToCharArray());

            var s = number.ToString();
            var len = s.Length;

            for (int i = 0; i < len / 2; i++)
            {
                if (s[i] != s[len - i - 1])
                    return false;
            }
            return true;
        }

        public static void ShouldBeTrue(this bool actual)
        {
            Assert.IsTrue(actual);
        }
        public static void ShouldBeFalse(this bool actual)
        {
            Assert.IsFalse(actual);
        }
        public static void Say(this object o, params object[] objects)
        {
            var toSay = string.Empty;

            var things = new[] { o }.Union(objects);

            things.Do(t => toSay += t + " ");

            toSay.Say();
        }
        public static void Do<T>(this IEnumerable<T> source, Action<T> action)
        {
            foreach (var item in source)
                action(item);
        }

    }
}