using System;
using System.Collections.Generic;
using System.Text;
using UnitTestSharp;
using Sunweaver.Commands.Abstracts;
using Sunweaver.Commands;
using Sunweaver.VM;

namespace Sunweaver.UnitTesting.Commands
{    
    public class mulTests : TestFixture
    {
        BasePair bp = new mul();
        VirtualMachine VM;
        
        public override void TestSetup()
        {
            VM = new VirtualMachine();
        }
        
        public void MultsCorrectly()
        {            
            VM.Stack.Push(25);
            VM.Stack.Push(30);

            bp.Implementation(VM);

            CheckEqual(750, VM.Stack.Pop());
        }
        
        public void NameTest()
        {
            CheckEqual("mul", bp.ToString());
        }

        /// <summary>
        /// Try to weird out the mult operator.  This will fail if theirs any loss of bit precision
        /// </summary>
        
        public void Overflow_NP()
        {            
            //18 nines
            VM.Stack.Push(IntStack.Min);
            VM.Stack.Push(IntStack.Max);

            bp.Implementation(VM);

            CheckEqual(-1, VM.Stack.Pop());
        }

        public void Overflow_PN()
        {
            //18 nines
            VM.Stack.Push(IntStack.Max);
            VM.Stack.Push(IntStack.Min);

            bp.Implementation(VM);

            CheckEqual(-1, VM.Stack.Pop());
        }

        public void Overflow_NN()
        {
            //18 nines
            VM.Stack.Push(IntStack.Min);
            VM.Stack.Push(IntStack.Min);

            bp.Implementation(VM);

            CheckEqual(1, VM.Stack.Pop());
        }

        public void Overflow_PP()
        {
            //18 nines
            VM.Stack.Push(IntStack.Max);
            VM.Stack.Push(IntStack.Max);

            bp.Implementation(VM);

            CheckEqual(1, VM.Stack.Pop());
        }
    }
}