using DbConnectionLibrairie;
using Entities;
using EntityManagers;

namespace UnitTestsEntityManagers
{
    public class UnitTestAnswerManager : AbstractUnitTestEM
    {

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

        /// <summary>
        /// test of the 'ajouterAnswer' method of an AnswerManager
        /// </summary>
        [Fact]
        public async void TestAddAnswer()
        {
            var answerToAdd = new AnswerEntity { Id = 1, Content = "chateîgne" };
            var a = await mgr.addAnswer(answerToAdd);
            // 1) normal insertion
            // WF : a is the same
            // as answerToAdd
            Assert.Equal(answerToAdd.Content, a.Content);
            Assert.Equal(answerToAdd.Id, a.Id);

            answerToAdd = new AnswerEntity { Id = 5, Content = "damien" };
            a = await mgr.addAnswer(answerToAdd);
            // 2) with a random id greater than 0
            // WF : 'a' content is equal to the
            // content of 'answerToAdd'
            // and since it's the second answer
            // that we add, his id equal 2
            Assert.Equal(answerToAdd.Content, a.Content);
            Assert.Equal((uint)2, a.Id);

            answerToAdd = new AnswerEntity { Id = 7, Content = "chateîgne" };
            a = await mgr.addAnswer(answerToAdd);
            // 3) with a content that we already have added
            // WF : the function return the answer which already
            // have the same content so the content of 'a' is "châteigne"
            // and his id is 1
            Assert.Equal("chateîgne", a.Content);
            Assert.Equal((uint)1, a.Id);

            answerToAdd = new AnswerEntity { Id = 7, Content = "CHATEÎGNE" };
            a = await mgr.addAnswer(answerToAdd);
            // 3) with a content that we already have added
            // but in upperCase instead of lowerCase
            // WF : the function return the answer which
            // already have the same content so the content
            // of 'a' is "chateîgne" and his id is 1
            Assert.Equal("chateîgne", a.Content);
            Assert.Equal((uint)1, a.Id);
        }

        /// <summary>
        /// test of the 'supprimerAnswer' method of an AnswerManager
        /// </summary>
        [Fact]
        public async Task TestRemoveAnswer()
        {
            // remember that we have only 2 answers in the database :
            // 1) (1, "châteigne")
            // 2) (2, "damien")
            var a = await mgr.removeAnswer(3);
            // 1) with an id greater or equal
            // to the number of element
            // WF : it don't works so 'a' is null,
            Assert.Null(a);

            a = await mgr.removeAnswer(1);
            // 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 1, the content is "châteigne"
            Assert.NotNull(a);
            Assert.Equal((uint)1, a.Id);
            Assert.Equal("châteigne", a.Content);

            a = await mgr.removeAnswer(2);
            // 1) same thing with the id 1 just
            // to clean the database
            // WF : it works so 'a' is not null,
            // and since we've delete the answer with
            // the id 2, the content is "damien"
            Assert.NotNull(a);
            Assert.Equal((uint)2, 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 3 (even though we've delete those)

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

            Assert.NotNull(fakeAnswers.datas); // just to be sure

            int count = 0;
            foreach (var answer in fakeAnswers.datas)
            {
                await mgr.addAnswer(answer);
                count++;
                Assert.Equal(count, mgr.getNbElements()); // ok, it's incremented
            }
        }

        public static IEnumerable<Object?[]> TestGetAnswer_Datas()
        {
            var datas = fakeAnswers.datas;
            uint max = 0;
            foreach (var item in datas)
            {
                yield return new Object[] { item.Id, item };
                if(max < item.Id) max = item.Id;
            }
            yield return new Object[] { max+1, null };
        }
        [Theory]
        [MemberData(nameof(TestGetAnswer_Datas))]
        public async Task TestGetAnswer(uint id, AnswerEntity? waiting)
        {
            var tmp = await mgr.getAnswer(id + 2);
            Assert.Equal(waiting?.Content, tmp?.Content);
        }

        // modifierAnswer

        // supprimerAnswer (les 2)

        // getAnswersByIdQuestion
    }
}