using DbConnectionLibrairie;
using Entities;
using EntityManagers;
using Newtonsoft.Json;

namespace UnitTestsEntityManagers
{
    public class UnitTestAnswerManager : AbstractUnitTestEM
    {
        IEnumerable<AnswerEntity> answers = JsonConvert
            .DeserializeObject<IEnumerable<AnswerEntity>>
            (File.ReadAllTextAsync("../fake-Answers.json").Result)!; // if this is null, we don't want to continue

        AnswerEntityManager mgr;
        public UnitTestAnswerManager()
            : base()
        {
            mgr = new AnswerEntityManager(dbContext);
        }

        /// <summary>
        /// test of the 'ajouterAnswer' method of an AnswerManager
        /// </summary>
        [Fact]
        public void TestAjouterAnswer()
        {
            var answerToAdd = new AnswerEntity { Id = -1, Content = "châteîgne" };
            var a = mgr.ajouterAnswer(answerToAdd);
            // 1) with an id less than 0
            // WF : it works so 'a' is not null,
            // his content is equal to the
            // content of 'answerToAdd'
            // and since it's the first answer
            // that we add, his id equal 0
            Assert.NotNull(a);
            Assert.Equal(answerToAdd.Content, a.Content);
            Assert.NotEqual(0, a.Id);

            answerToAdd = new AnswerEntity { Id = 5, Content = "damien" };
            a = mgr.ajouterAnswer(answerToAdd);
            // 2) with a random id greater than 0
            // WF : it works so 'a' is not null,
            // his content is equal to the
            // content of 'answerToAdd'
            // and since it's the second answer
            // that we add, his id equal 1
            Assert.NotNull(a);
            Assert.Equal(answerToAdd.Content, a.Content);
            Assert.NotEqual(1, a.Id);

            answerToAdd = new AnswerEntity { Id = 7, Content = "châteîgne" };
            a = mgr.ajouterAnswer(answerToAdd);
            // 3) with a content that we already have added
            // WF : it don't works so 'a' is null
            Assert.Null(a);

            answerToAdd = new AnswerEntity { Id = 7, Content = "CHÂTEÎGNE" };
            a = mgr.ajouterAnswer(answerToAdd);
            // 3) with a content that we already have added
            // but in upperCase instead of lowerCase
            // WF : it don't works so 'a' is null
            Assert.Null(a);
        }

        /// <summary>
        /// test of the 'supprimerAnswer' method of an AnswerManager
        /// </summary>
        [Fact]
        public void TestSupprimerAnswer()
        {
            // remember that we have only 2 answers in the database :
            // 1) (0, "châteigne")
            // 2) (1, "damien")
            var a = mgr.supprimerAnswer(-3);
            // 1) with an id less than 0
            // WF : it don't work because there's no
            // negative id so 'a' is null
            Assert.Null(a);

            a = mgr.supprimerAnswer(3);
            // 2) with an id greater or equal
            // to the number of element
            // WF : it don't works so 'a' is null,
            Assert.Null(a);

            a = mgr.supprimerAnswer(0);
            // 1) with an id that belongs to an answer
            // WF : it works so 'a' is not null,
            // and since we've delete the answer with
            // the id 0, the content is "châteigne"
            Assert.NotNull(a);
            Assert.Equal(0, a.Id);
            Assert.Equal("châteigne", a.Content);

            a = mgr.supprimerAnswer(0);
            // 1) same thing with the id 1 just
            // for cleaning the database
            // WF : it works so 'a' is not null,
            // and since we've delete the answer with
            // the id 1, the content is "damien"
            Assert.NotNull(a);
            Assert.Equal(0, a.Id);
            Assert.Equal("damien", a.Content);

            // now, the database should be clean
        }

        // /!\ WARNING : since there was 2 answers added to the base,
        // id index while now start at 2 (even though we've delete those)

        /// <summary>
        /// test of the 'getNbElement' method of an AnswerManager
        /// </summary>
        [Fact]
        public void TestGetNbElement()
        {
            Assert.Equal(0, mgr.getNbElement()); // just to be sure

            Assert.NotNull(answers); // just to be sure

            int count = 0;
            foreach (var answer in answers)
            {
                mgr.ajouterAnswer(answer);
                count++;
                Assert.Equal(count, mgr.getNbElement());
            }
        }

        // getAnswers

        // modifierAnswer

        // supprimerAnswer (les 2)

        // getAnswersByIdQuestion
    }
}