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


namespace listas2
{
	/*
		Author: F. Raszeja
		2nd Assignment List delivery date: 10/09/2020
		Translated to English: 30/08/2021
	*/
	
    class Lista2
    {
		
		static void exercicio1(){
			for(int i = 11; i <= 250; i++)
			{
				if(i % 2 == 0)Console.WriteLine(i + " is even");
			}
		}
		static void exercicio2(){
			int a,b,tmp;
			Console.WriteLine("Write a number, then press ENTER.");
			a = int.Parse(Console.ReadLine());
			b = int.Parse(Console.ReadLine());
			if (a < b)
			{
				tmp = a;
				a = b;
				b = tmp;
			}
			// b -- lowest value; a -- highest value
			for(int i = a; i >= b; i--)
			{
				if(!(i % 2 == 0))Console.WriteLine(i + " is odd");
			}
		}
		static void exercicio3(){
			int a;
			Console.WriteLine("Write a number, then press ENTER.");
			a = int.Parse(Console.ReadLine());
			for(int i = 1; i <= 10; i++)
			{
				Console.WriteLine("{0} x {1} = {2}",a,i,a*i);
			}
		}
		static void exercicio4(){
			int a,b,tmp,c = 0;
			Console.WriteLine("Write a number, then press ENTER.");
			a = int.Parse(Console.ReadLine());
			b = int.Parse(Console.ReadLine());
			if (a < b)
			{
				tmp = a;
				a = b;
				b = tmp;
			}
			// b -- lowest value; a -- highest value
			for(int i = a; i >= b; i--)
			{
				if(!(i % 2 == 0))c++;
			}
			Console.WriteLine("{0} odd numbers",c);
		}
		static void exercicio5(){
			int[] input = new int[15];
			int val = 0;
			Console.WriteLine("Insert 15 numbers");
			for(int i = 0; i < input.Length; i++)
			{
				input[i] = int.Parse(Console.ReadLine());
			}
			// Easier for me to just use Linq
			// Console.WriteLine(input.Max());
			// But I'll instead use a foreach
			foreach(int num in input)
			{
				if(num > val)val = num;
			}
			Console.WriteLine(val + " is the biggest number.");
		}
		static void exercicio6(){
			int[] notas = new int[10];
			int cur, med, cou;
			med = cou = 0;
			while(cou < notas.Length){
				Console.WriteLine("Insert a Grade (0-10)");
				cur = int.Parse(Console.ReadLine());
				if(!(cur <= 10 && cur >= 0))
				{
					Console.WriteLine("Invalid value. Try again.");
				}
				else
				{
					notas[cou] = cur;
					cou++;
				}	
			}
			// Linq -> notas.Sum();
			foreach(int e in notas)
			{
				med += e;
			}
			Console.WriteLine("The sum of all grades: {0}, Avg. grade: {1:N2}",med,(double)med/notas.Length);
		}
		static void exercicio7(){
			for(int i = 1; i <= 100; i++)
			{
				if(i % 10 == 0)Console.WriteLine("{0} is a multiple of 10",i);
			}
		}
		static void exercicio8(){
			int val,fat = 1;
			Console.WriteLine("Insert a value");
			val = int.Parse(Console.ReadLine());
			
			for(int i = 1; i <= val; i++)
			{
				fat *= i;
			}
			Console.WriteLine("{0}! = {1}",val,fat);
			
		}
		static void exercicio9(){
			List<int> vals = new List<int>();
			// Making a list to help me out
			ConsoleKeyInfo sel;
			
			int countA,countB,countC,countD;
			countA=countB=countC=countD=0;
			Console.Clear();
			do
			{
				Console.WriteLine("\n------------------");
				Console.WriteLine("Insert a number.");
				vals.Add(int.Parse(Console.ReadLine()));
				Console.WriteLine("Added. Continue (Y/N)?");
				sel = Console.ReadKey();
			} while(sel.Key == ConsoleKey.Y);
			
			foreach(int e in vals)
			{
				if(e % 2 == 0){countA++;}else{countB++;}
				if(e >= 0){countC++;}else{countD++;}
			}
			Console.WriteLine("\nFrom the list, {0} even numbers, {1} odd, {2} positives, {3} negatives",countA,countB,countC,countD);
		}
		static void exercicio10(){
			int c, n;
			double e = 0;
			
			ConsoleKeyInfo sel;
			
			do{
				Console.Clear();
				Console.WriteLine("Employee No.:");
				c = int.Parse(Console.ReadLine());
				Console.WriteLine("Worked hours:");
				n = int.Parse(Console.ReadLine());

				for(int i = 1; i <= n; i++)
				{
					if(i > 50){e+=20;}else{e = 0;}
				}
				
				Console.WriteLine("No. {0}, Regular Salary {1}, Exceeding Salary {2}, Total Salary {3}",c,(n*10),e, (n*10)+e);
				Console.WriteLine("Continue (Y/N)?");
				sel = Console.ReadKey();
			} while(sel.Key == ConsoleKey.Y);
		}

		static bool ParseStr(string val)
		{
			if (!val.Any(x=> char.IsLetter(x))){
				int tmp = int.Parse(val);
				if (tmp != 0 && tmp <= 10) return true;
			}
			return false;
		}
		
        static void Main(string[] args)
		// UI code again...
        {
			string sel = "";
			do{
				Console.Clear();
				
				Console.BackgroundColor = ConsoleColor.White;
				Console.ForegroundColor = ConsoleColor.Black;
				Console.WriteLine("Select one of the Examples");
				Console.ResetColor();
				
				Console.WriteLine("\n1-10\tExamples 1-10");
				Console.WriteLine("\texit\tQuit to desktop.");
				
				Console.Write("--> ");
				sel = Console.ReadLine();
				
				if(sel != "exit" && ParseStr(sel)){
					Type typesPrograma = typeof(Lista2);
					MethodInfo aInvocar = typesPrograma.GetMethod(
						"exercicio"+sel, BindingFlags.Static | BindingFlags.NonPublic);
					aInvocar.Invoke(null, null);
				}
				Console.WriteLine("\nPress any key to continue...");
				Console.ReadKey();
			}
			while(sel.ToLower() != "exit");
        }
    }
}