using Moq;
using NUnit.Framework;
using System;
using System.Collections.Generic;
using Tasks.Lab_3;

namespace Lab_NUnit_Tests.Lab_3
{
    [TestFixture]
    public class BookingHelperTests
    {
        private DateTime Before(DateTime dateTime, int days = 1) { return dateTime.AddDays(-days); }
        private DateTime After(DateTime dateTime, int days = 1) { return dateTime.AddDays(days); }

        private Mock<IBookingRepository> bookingRepositoryMock;

        private Booking bookingFixture = new Booking
        {
            ArrivalDate = new DateTime(2019, 11, 29, 11, 05, 0),
            DepartureDate = new DateTime(2019, 12, 23, 11, 30, 0),
            Id = 1,
            Reference = "test",
            Status = "Pending",
        };

        [OneTimeSetUp]
        public void StorageMockSetupUp()
        {
            bookingRepositoryMock = new Mock<IBookingRepository>();

            bookingRepositoryMock.Setup(repository => repository.GetActiveBookings(1)).Returns(new List<Booking> { bookingFixture });
        }

        [TearDown]
        public void StorageMockTearDown()
        {
            bookingRepositoryMock.Invocations.Clear();
        }

        [Test]
        public void BookingStartsAndFinishesBeforeAnExistingBookingReturnsEmptyString()
        {
            var result = BookingHelper.OverlappingBookingsExist(new Booking
            {
                Id = 1,
                ArrivalDate = Before(bookingFixture.ArrivalDate, 2),
                DepartureDate = Before(bookingFixture.ArrivalDate)
            }, bookingRepositoryMock.Object);

            Assert.AreEqual(result, string.Empty);
        }

        [Test]
        public void BookingFinishesDuringAnExistingBookingReturnsOverlappingReference()
        {
            var result = BookingHelper.OverlappingBookingsExist(new Booking
            {
                Id = 1,
                ArrivalDate = Before(bookingFixture.ArrivalDate, 1),
                DepartureDate = After(bookingFixture.ArrivalDate, 1)
            }, bookingRepositoryMock.Object);

            Assert.AreEqual(result, bookingFixture.Reference);
        }

        [Test]
        public void BookingStartsDuringAnExistingBookingReturnsOverlappingReference()
        {
            var result = BookingHelper.OverlappingBookingsExist(new Booking
            {
                Id = 1,
                ArrivalDate = After(bookingFixture.ArrivalDate, 1),
                DepartureDate = After(bookingFixture.DepartureDate, 1)
            }, bookingRepositoryMock.Object);

            Assert.AreEqual(result, bookingFixture.Reference);
        }

        [Test]
        public void BookingStartsBeforeAndFinishesAfterExistingBookingReturnsOverlappingReference()
        {
            var result = BookingHelper.OverlappingBookingsExist(new Booking
            {
                Id = 1,
                ArrivalDate = Before(bookingFixture.ArrivalDate, 1),
                DepartureDate = After(bookingFixture.DepartureDate, 1)
            }, bookingRepositoryMock.Object);

            Assert.AreEqual(result, bookingFixture.Reference);
        }
    }
}