using DbConnectionLibrairie;
using Entities;
using EntityManagers;
using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;
using OrderCriterias;
using StubbedDbContextLibrary;

var connection = new SqliteConnection("DataSource=:memory:");

connection.Open();

var opt = new DbContextOptionsBuilder<StubbedDbContext>()
    .UseSqlite(connection)
    .Options;
using var context = new StubbedDbContext();
context.Database.EnsureCreated();

/// <summary>
/// test of the 'addAnswer' method of an AnswerManager
/// </summary>
void TestAddAnswer()
{
    var connection = new SqliteConnection("DataSource=:memory:");

    connection.Open();

    var opt = new DbContextOptionsBuilder<MyDbContext>()
        .UseSqlite(connection)
        .Options;
    using (var context = new MyDbContext(opt))
    {
        context.Database.EnsureCreated();
        var manager = new AnswerEntityManager(context);
        var answerToAdd = new AnswerEntity { Id = 1, Content = "chateîgne" };
        var a = manager.addAnswer(answerToAdd).Result;
        // 1) normal insertion
        // WF : a is the same
        // as answerToAdd
        if (a.Content == answerToAdd.Content && a.Id == answerToAdd.Id)
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("test 1 AnswerEntityManager.addAnswer OK");
            Console.ResetColor();
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("test 1 AnswerEntityManager.addAnswer KO");
            Console.ResetColor();
        }

        answerToAdd = new AnswerEntity { Id = 5, Content = "damien" };
        a = manager.addAnswer(answerToAdd).Result;
        // 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
        if (a.Content == answerToAdd.Content && a.Id == 2)
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("test 2 AnswerEntityManager.addAnswer OK");
            Console.ResetColor();
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("test 2 AnswerEntityManager.addAnswer KO");
            Console.ResetColor();
        }

        answerToAdd = new AnswerEntity { Id = 7, Content = "chateîgne" };
        a = manager.addAnswer(answerToAdd).Result;
        // 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
        if (a.Content == "chateîgne" && a.Id == 1)
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("test 3 AnswerEntityManager.addAnswer OK");
            Console.ResetColor();
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("test 3 AnswerEntityManager.addAnswer KO");
            Console.ResetColor();
        }

        answerToAdd = new AnswerEntity { Id = 7, Content = "CHATEÎGNE" };
        a = manager.addAnswer(answerToAdd).Result;
        // 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
        if (a.Content == "chateîgne" && a.Id == 1)
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("test 4 AnswerEntityManager.addAnswer OK");
            Console.ResetColor();
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("test 4 AnswerEntityManager.addAnswer KO");
            Console.ResetColor();
        }
        foreach (var item in context.Answers) context.Answers.Remove(item); // we remove all database answers
        context.SaveChanges();
    }
}

/// <summary>
/// test of the 'supprimerAnswer' method of an AnswerManager
/// </summary>
void TestRemoveAnswerById(MyDbContext context)
{
    var mgr = new AnswerEntityManager(context);
    var a = mgr.removeAnswer(context.Answers.Select(a => a.Id).Max() + 1).Result;
    // 1) with an id greater or equal
    // to the number of element
    // WF : it don't works so 'a' is null,
    if(a == null)
    {
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine("test 1 AnswerEntityManager.RemoveAnswer OK");
        Console.ResetColor();
    }
    else
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("test 1 AnswerEntityManager.RemoveAnswer KO");
        Console.ResetColor();
    }

    a = mgr.removeAnswer(context.Answers.Select(a => a.Id).Min()).Result;
    // 1) with an id that is allowed 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"
    if (a != null && a.Content == context.Answers.Single(a => a.Id == context.Answers.Select(a => a.Id).Min()).Content
        && a.Id == context.Answers.Select(a => a.Id).Min())
    {
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine("test 2 AnswerEntityManager.RemoveAnswer OK");
        Console.ResetColor();
    }
    else
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("test 2 AnswerEntityManager.RemoveAnswer KO");
        Console.ResetColor();
    }
}

/// <summary>
/// test of the 'getNbElement' method of an AnswerManager
/// </summary>
void TestGetNbAnswers(MyDbContext context)
{
    var mgr = new AnswerEntityManager(context);
    int count = context.Answers.CountAsync().Result;
    int nb = 0;
    foreach (var answer in fakeAnswers.datas)
    {
        var tmp = mgr.addAnswer(answer).Result;
        count++;
        nb++;
        if (mgr.getNbAnswers() == count)
        { // ok, it's incremented
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine($"test {nb} AnswerEntityManager.getNbAnswers OK");
            Console.ResetColor();
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine($"test {nb} AnswerEntityManager.getNbAnswers KO");
            Console.ResetColor();
        }
    }
}

/// <summary>
/// member data for the 'TestGetAnswer' test method
/// </summary>
/// <returns>a set of all inline datas for the test method</returns>
IEnumerable<Object?[]> TestGetAnswer_Datas()
{
    var datas = fakeAnswers.datas;
    int max = 0;
    List<Object?[]> tmp = new List<Object?[]>();
    foreach (var item in datas)
    {
        tmp.Add(new Object[] { item.Id, item });
        if (max < item.Id) max = item.Id;
    }
    tmp.Add(new Object[] { max + 1, null! });
    return tmp;
}

/// <summary>
/// test of the 'getAnswer' method of an AnswerManager
/// </summary>
/// <param name="id">identifiant of the answer to get</param>
/// <param name="waiting">answer expected</param>
/// <returns>nothing but a Task</returns>
void TestGetAnswer(MyDbContext context, int numTest, int id, AnswerEntity? waiting)
{
    context.Database.EnsureCreated();
    var mgr = new AnswerEntityManager(context);

    var tmp = mgr.getAnswer(id + 2).Result;
    if (tmp?.Content == waiting?.Content)
    {
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine($"test {numTest} AnswerEntityManager.addAnswer OK");
        Console.ResetColor();
    }
    else
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine($"test {numTest} AnswerEntityManager.addAnswer KO");
        Console.ResetColor();
    }
}

/// <summary>
/// member data for the 'TestGetAnswer' test method
/// </summary>
/// <returns>a set of all inline datas for the test method</returns>
static IEnumerable<Object?[]> TestGetSomeAnswers_Datas()
{
    var datas = fakeAnswers.datas;
    var count = datas.Count();
    // remind that to add answers, we haven't ordered this collection
    // but we just have done a foreach

    return new List<Object?[]>
    {
        // 1 : 0 answer from the page 1 then, -1 answer from this page
        // WF : count < 1 so we got null
        new object?[] { 1, 0, null },
        new object?[] { 1, -1, null },
        // 2 : 1 answers from the page 0 then, 1 answers from the page -1
        // WF : page < 1 so we got null
        new object?[] { 0, 1, null },
        new object?[] { -1, 1, null },
        // 3 : 10 answers from the page 1
        // WF : the first 10 element of datas
        new object?[] { 1, 10, datas.Take(10) },
        // 4 : 10 elements from the page 1 order by id
        // WF : the first 10 element of datas order by id
        new object?[] { 1, 10, datas.OrderBy(e => e.Id).Take(10), AnswerOrderCriteria.ById },
        // 5 : 10 elements from the page 1 order by content
        // WF : the first 10 element of datas order by content
        new object?[] { 1, 10, datas.OrderBy(e => e.Content).Take(10), AnswerOrderCriteria.ById },
        // 6 : repeat 3, 4 and 5 with the page 2
        // WF : the 10 next answer from each case
        new object?[] { 2, 10, datas.Skip(10).Take(10) },
        new object?[] { 1, 10, datas.OrderBy(e => e.Id).Skip(10).Take(10), AnswerOrderCriteria.ById },
        new object?[] { 1, 10, datas.OrderBy(e => e.Content).Skip(10).Take(10), AnswerOrderCriteria.ByContent },
        // 7 : count/4 elements from the page 4
        // WF : the lasts count/4 elements of datas
        new object?[] { 4, count / 4, datas.TakeLast(count / 4) },
        // 8 : count/4 elements from the page 5
        // WF : null since num (4) >= count / (count/4)
        new object?[] { 5, count / 4, null },
        // 9 : 10 elements from the page 4
        // WF : since there's only 31 elements in fake datas,
        // we got the last element
        new object?[] { 4, 10, datas.TakeLast(1) }
    };
}

/// <summary>
/// test of the 'getAnswer' method of an AnswerManager
/// </summary>
/// <param name="num">the page number</param>
/// <param name="count">page elements number</param>
/// <param name="waiting">set of answers expected</param>
/// <param name="orderCriteria">the order criteria</param>
/// <returns>nothing but a Task</returns>
void TestGetSomeAnswers(MyDbContext context, int numTest, int num, int count, IEnumerable<AnswerEntity>? waiting, AnswerOrderCriteria orderCriteria = AnswerOrderCriteria.ById)
{
    context.Database.EnsureCreated();
    var mgr = new AnswerEntityManager(context);

    var nbPages = count == 0 ? -1 : mgr.getNbAnswers() / count;
    var tmp = mgr.getAnswers(num, count, orderCriteria).Result;
    if(tmp.nbPages == nbPages){
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine($"test {numTest} AnswerEntityManager.getSomeAnswers OK");
        Console.ResetColor();
    }
    else
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine($"test {numTest} AnswerEntityManager.getSomeAnswers KO");
        Console.ResetColor();
    }

    if (waiting == null && tmp.answers == null)
    {
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers OK");
        Console.ResetColor();
    }
    else if (waiting != null && tmp.answers != null)
    {
        if (waiting?.Count() == 0)
        {
            if(tmp.answers == null)
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers OK");
                Console.ResetColor();
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers KO");
                Console.ResetColor();
            }
        }
        else
        {
            var nbFautes = 0;
            for (var i = 0; i < count; i++)
            {
                var e1 = waiting!.ElementAt(i);
                var e2 = tmp.answers.ElementAt(i);
                if(e2.Content != e1.Content || e2.IdQuestion != e1.IdQuestion) nbFautes++;
            }
            if (nbFautes == 0)
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers OK");
                Console.ResetColor();
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers KO");
                Console.ResetColor();
            }
        }
    }
    else
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine($"test {numTest + 1} AnswerEntityManager.getSomeAnswers KO");
        Console.ResetColor();
    }
}

// Tests of an answer
{
    TestAddAnswer();
    TestRemoveAnswerById(context);
    TestGetNbAnswers(context);
    var tmp = TestGetAnswer_Datas();
    for (int i = 0; i < tmp.Count(); i++)
    {
        TestGetAnswer(context, i, (int)tmp.ElementAt(i).ElementAt(0)!, (AnswerEntity)tmp.ElementAt(i).ElementAt(1)!);
    }
    tmp = TestGetSomeAnswers_Datas();
    for (int i = 0; i < tmp.Count(); i++)
    {
        TestGetSomeAnswers(context, i, (int)tmp.ElementAt(i).ElementAt(0)!, (int)tmp.ElementAt(i).ElementAt(1)!,
            (IEnumerable<AnswerEntity>?)tmp.ElementAt(i).ElementAtOrDefault(2),
            (AnswerOrderCriteria)(tmp.ElementAt(i).ElementAtOrDefault(i) ?? AnswerOrderCriteria.ById)
        );
    }
}



// removeAnswer by element

// updateAnswer