using System.Collections;
using System.Collections.Generic;
using NUnit.Framework;
using CSVReader;
using UnityEngine;
using UnityEngine.TestTools;
using System.Threading;
using System;

namespace Tests
{
    public class CSVReaderTest
    {
        private ICSVReader ICSVReader { get; set; }


        [SetUp]
        public void Setup()
        {
            string filepath = "SampleOutput.bin";
            ICSVReader = new CSVReader.UnitCSVReader(filepath);
        }

        [Test]
        public void TestPeekAndReadForward()
        {
            InputObject inpObj;

            //Read first entry of file
            Assert.AreEqual(0.0, ICSVReader.Peek(true), "Peek at 1. Elem of File");
            inpObj = ICSVReader.ReadNextEntry(true);
            Assert.IsNotNull(inpObj, "Test if Item is null");
            Assert.AreEqual(0.0, inpObj.Time, "Test timestamp of first InputObject");

            //jump to last entry and try to read next
            Assert.AreEqual(99.75, ICSVReader.JumpToEntry(99.75, true), "Jump in File");
            Assert.AreEqual(99.75, ICSVReader.Peek(true), "Peek at (last+1) Elem of File");
            ICSVReader.ReadNextEntry(true);//read through the 99.75 time slot
            ICSVReader.ReadNextEntry(true);
            ICSVReader.ReadNextEntry(true);
            ICSVReader.ReadNextEntry(true);
            inpObj = ICSVReader.ReadNextEntry(true);
            Assert.IsNull(inpObj, "(last+1) Elem should be null");
        }

        [Test]
        public void TestPeekAndReadBackward()
        {
            InputObject inpObj;

            //try to read -1 entry
            Assert.AreEqual(0, ICSVReader.Peek(false), "Test backward peek of first element");
            inpObj = ICSVReader.ReadNextEntry(false);
            Assert.IsNull(inpObj, ("Found another Entry after the last with " + true));

            //jump in file and read backwards
            Assert.AreEqual(10, ICSVReader.JumpToEntry(10, false), "Jump in File");
            Assert.AreEqual(10, ICSVReader.Peek(false), "Peek at backward Elem");
            inpObj = ICSVReader.ReadNextEntry(false);
            Assert.IsNotNull(inpObj, "Test if entry is not null");
            Assert.AreEqual(10, inpObj.Time, "Test timestamp of InputObject");
        }

        [Test]
        public void TestOutOfBounds()
        {
            Assert.IsTrue(ICSVReader.IsInBounds(0));
            Assert.IsTrue(ICSVReader.IsInBounds(5));
            Assert.IsTrue(ICSVReader.IsInBounds(99.75));
            Assert.IsFalse(ICSVReader.IsInBounds(-1));
            Assert.IsFalse(ICSVReader.IsInBounds(100));
            Assert.IsFalse(ICSVReader.IsInBounds(double.NaN));
            Assert.IsFalse(ICSVReader.IsInBounds(double.MaxValue));
            Assert.IsFalse(ICSVReader.IsInBounds(double.MinValue));
        }

        [Test]
        public void TestWrongFilename()
        {
            InputObject inpObj;

            ICSVReader iAmWrong = new UnitCSVReader("WerBinIch.bin");

            inpObj = iAmWrong.ReadNextEntry(true);
            Assert.IsNull(inpObj, "Hat Werte trotz falschem Dateinamen");
            inpObj = iAmWrong.ReadNextEntry(false);
            Assert.IsNull(inpObj, "Hat Werte trotz falschem Dateinamen");
            Assert.AreEqual(-1, iAmWrong.JumpToEntry(1, false));
            Assert.AreEqual(false, iAmWrong.IsInBounds(1));
            Assert.AreEqual(-1, iAmWrong.Peek(true));
            Assert.AreEqual(-1, iAmWrong.Peek(false));

            bool except = false;
            string msg = string.Empty;
            try
            {
                iAmWrong.TearDown();
            }
            catch (Exception e)
            {
                except = true;
                msg = e.Message;
            }
            Assert.IsFalse(except, "Exception was thrown on Teardown: " + msg);

        }
        public void TestFirstAndLastTimestamp()
        {
            Assert.AreEqual(0, ICSVReader.GetFirstTimestamp());
            Assert.AreEqual(99.75, ICSVReader.GetLastTimestamp());
        }
        [TearDown]
        public void TearDown()
        {
            ICSVReader.TearDown();
        }
    }
}