using LibrarySystem.Core;
using LibrarySystem.Interfaces;
using NUnit.Framework;

namespace LibrarySystem.Tests
{
    [TestFixture]
    public class LibraryTests
    {
        /*
         * Factory that creates:
         *      Library with 10 books (2 x Lord of the Flies, 3 x 1984, 5 x Brave New World)
        */
        private ILibrary CreateScenario()
        {
            #region Publisher

            IPublisher penguin = new Publisher() {Name = "Penguin"};
            
            #endregion

            #region Publications

            IPublication lordOfTheFlies = new Publication()
            {
                Author = "William Golding",
                ISBN = "0140283331",
                Publisher = penguin,
                Title = "Lord of the Flies"
            };

            IPublication nineteenEightyFour = new Publication()
            {
                Author = "George Orwell",
                ISBN = "0452284236",
                Title = "Nineteen Eighty-Four"
            };

            IPublication braveNewWorld = new Publication()
            {
                Author = "Aldous Huxley",
                ISBN = "0060850523",
                Title = "Brave New World"
            };

            #endregion

            #region Books

            // Lord of the flies
            IBook book1 = new Book(lordOfTheFlies)
                {Id = "0000001", CurrentFee = 1.25m};
            IBook book2 = new Book(lordOfTheFlies)
                {Id = "0000002", CurrentFee = 1.25m};
            IBook book3 = new Book(lordOfTheFlies)
                {Id = "0000003", CurrentFee = 1.25m};

            // 1984
            IBook book4 = new Book(nineteenEightyFour)
                {Id = "0000004", CurrentFee = 1.5m};
            IBook book5 = new Book(nineteenEightyFour)
                {Id = "0000005", CurrentFee = 1.5m};

            // Brave new world
            IBook book6 = new Book(braveNewWorld)
                {Id = "0000006", CurrentFee = 1.8m};
            IBook book7 = new Book(braveNewWorld)
                {Id = "0000007", CurrentFee = 1.8m};
            IBook book8 = new Book(braveNewWorld)
                {Id = "0000008", CurrentFee = 1.8m};
            IBook book9 = new Book(braveNewWorld)
                {Id = "0000009", CurrentFee = 1.8m};
            IBook book10 = new Book(braveNewWorld)
                {Id = "0000010", CurrentFee = 1.8m};

            #endregion
            
            #region Library

            ILibrary library = new Library();
            library.Location = "Leicester Square";
            library.AddStock(book1, book2, book3, book4, book5, book6, book7, book8, book9, book10);

            #endregion

            return library;
        }

        [Test]
        public void AddStockShouldIncreaseStockListCountByOne()
        {
            //arrange
            var library = new Library();
            var expected = library.StockList.Count + 1;
            var dummyBook = new Book(new Publication());

            //act
            library.AddStock(dummyBook);
            var actual = library.StockList.Count;

            //assert
            Assert.AreEqual(expected, actual);
        }

        [Test]
        public void SearchForAvailableBookByIBSNShouldReturnTrue()
        {
            var library = CreateScenario();

            // Lord of the flies
            var validISBN = "0140283331";

            var actual = library.IsBookAvailableByISBN(validISBN);

            Assert.IsTrue(actual);
        }

        [Test]
        public void SearchForUnavailableBookByIBSNShouldReturnFalse()
        {
            var library = CreateScenario();

            // rubbish data
            var invalidISBN = "X";

            var actual = library.IsBookAvailableByISBN(invalidISBN);

            Assert.IsFalse(actual);
        }

        [Test]
        public void FindBooksByValidSearchTitleString()
        {
            var library = CreateScenario();

            // good search string
            var searchString = "Flies";

            // number of Lord of the Flies books expected
            var expected = 3;
            var actual = library.FindBooks(searchString).Count;

            Assert.AreEqual(expected, actual);
        }


        [Test]
        public void FindBooksByValidSearchTitleStringLowerCase()
        {
            var library = CreateScenario();

            // good search string
            var searchString = "flies";

            // number of Lord of the Flies books expected
            var expected = 3;
            var actual = library.FindBooks(searchString).Count;

            Assert.AreEqual(expected, actual);
        }

        [Test]
        public void FindBooksByValidSearchStringMultiplePublications()
        {
            var library = CreateScenario();

            // good search string
            var searchString = "e";

            // number of Lord of the Flies books expected
            var expected = 10;
            var actual = library.FindBooks(searchString).Count;

            Assert.AreEqual(expected, actual);
        }

        [Test]
        public void FindBooksByValidSearchAuthorString()
        {
            var library = CreateScenario();

            // number of Brave New World books expected
            var expected = 5;
            var searchString = "ldous";

            var actual = library.FindBooks(searchString).Count;

            Assert.AreEqual(expected, actual);
        }

        [Test]
        public void FindBooksByInvalidSearchString()
        {
            var library = CreateScenario();

            // rubbish data
            var searchString = "XYZ";

            var actual = library.FindBooks(searchString);

            Assert.IsEmpty(actual);            
        }
    }
}