using System;
using Antlr4.Runtime;
using ChaosBot.Services;
using NUnit.Framework;

namespace ChaosBot.UnitTests
{
    public class TimerTests
    {
        [SetUp]
        public void Setup()
        {
        }

        [Test]
        public void RunAt_RunningTimerAtTimestamp_True()
        {           
            DateTime current = DateTime.Now;
            DateTime runAt = current + new TimeSpan(TimeSpan.TicksPerSecond * 10);
            DateTime testAt = current + new TimeSpan(TimeSpan.TicksPerSecond * 2);

            int totalRuns = 0;
            
            void ToRun()
            {
                totalRuns++;
            }

            int timerId = Timer.RunAt(ToRun, runAt);

            Assert.AreEqual(totalRuns, 0);
            // Wait for the timer to finish
            Timer.Join(timerId);
            Assert.AreEqual(totalRuns, 1);
            Assert.GreaterOrEqual(DateTime.Now, testAt);
        }

        [Test]
        public void RunIn_RunningTimerInTimeSpan_True()
        {           
            DateTime current = DateTime.Now;
            TimeSpan runIn = new TimeSpan(TimeSpan.TicksPerSecond * 10);
            DateTime testAt = current + new TimeSpan(TimeSpan.TicksPerSecond * 2);

            int totalRuns = 0;
            
            void ToRun()
            {
                totalRuns++;
            }

            int timerId = Timer.RunIn(ToRun, runIn);

            Assert.AreEqual(totalRuns, 0);
            // Wait for the timer to finish
            Timer.Join(timerId);
            Assert.AreEqual(totalRuns, 1);
            Assert.GreaterOrEqual(DateTime.Now, testAt);
        }

        [Test]
        public void RunTimer_RunningTimerCountingExecutions_True()
        {           
            DateTime current = DateTime.Now;
            TimeSpan interval = new TimeSpan(TimeSpan.TicksPerSecond * 2);
            DateTime testAt = current + new TimeSpan(TimeSpan.TicksPerSecond * 11);

            int totalRuns = 0;
            
            void ToRun()
            {
                totalRuns++;
            }

            int timerId = Timer.RunTimer(ToRun, interval, offset: interval);

            void CancelCallback()
            {
                Timer.CancelTimer(timerId);
            }

            int cancelTimerId = Timer.RunAt(CancelCallback, testAt);

            Assert.AreEqual(totalRuns, 0);
            // Wait for the cancel timer to finish
            Timer.Join(cancelTimerId);
            Assert.AreEqual(totalRuns, 5);
        }
    }
}