using System.Data;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Vit.Linq;

namespace Vitorm.MsTest.CommonTest
{

    [TestClass]
    public class Query_Method_Test
    {

        [TestMethod]
        public void Test_PlainQuery()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var userList = userQuery.OrderBy(m => m.id).ToList();
                Assert.AreEqual(6, userList.Count);
                Assert.AreEqual(1, userList.First().id);
                Assert.AreEqual(6, userList.Last().id);
            }


            {
                var userList = userQuery.OrderBy(m => m.id).Select(u => u.id).ToList();
                Assert.AreEqual(6, userList.Count);
                Assert.AreEqual(1, userList.First());
                Assert.AreEqual(6, userList.Last());
            }
        }


        [TestMethod]
        public void Test_AllFeatures()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            #region users.Where().OrderBy().Skip().Take().ToList
            /*
            users.Where(row => row.user.id > 2)
            .OrderBy(user=>user.id)
            .Select(row => new {row.user })
            .Skip(1).Take(2);
             */
            {
                var query = (from user in userQuery
                             where user.id > 2
                             orderby user.id descending
                             select new
                             {
                                 user
                             })
                            .Skip(1).Take(2);

                var list = query.ToList();

                Assert.AreEqual(2, list.Count);
                Assert.AreEqual(5, list[0].user.id);
                Assert.AreEqual(4, list[1].user.id);
            }
            #endregion
        }



        [TestMethod]
        public void Test_Get()
        {
            {
                using var dbContext = DataSource.CreateDbContext();
                var user = dbContext.Get<User>(3);
                Assert.AreEqual(3, user?.id);
            }
            {
                using var dbContext = DataSource.CreateDbContext();
                var user = dbContext.DbSet<User>().Get(5);
                Assert.AreEqual(5, user?.id);
            }
        }



        [TestMethod]
        public void Test_Select()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var userList = userQuery.Select(u => u).Where(user => user.id == 3).Select(u => u).ToList();
                Assert.AreEqual(1, userList.Count);
                Assert.AreEqual(3, userList.First().id);
            }

            {
                var userList = userQuery.Where(user => user.id == 3).Select(u => (float)u.id).ToList();
                Assert.AreEqual(1, userList.Count);
                Assert.AreEqual(3.0, userList.First());
            }

            {
                var query =
                    from user in userQuery
                    orderby user.id
                    select new
                    {
                        uniqueId1 = user.id + "_" + user.fatherId + "_" + user.motherId,
                        uniqueId2 = $"{user.id}_{user.fatherId}_{user.motherId}"
                    };

                var userList = query.ToList();
                Assert.AreEqual(6, userList.Count);
                Assert.AreEqual("1_4_6", userList[0].uniqueId1);
                Assert.AreEqual("1_4_6", userList[0].uniqueId2);
                Assert.AreEqual("4__", userList[3].uniqueId1);
                Assert.AreEqual("4__", userList[3].uniqueId2);
            }

        }


        [TestMethod]
        public void Test_OrderBy()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var query = userQuery.OrderByDescending(user => user.id);

                var userList = query.ToList();
                Assert.AreEqual(6, userList.Count);
                Assert.AreEqual(6, userList[0].id);
            }

            {
                var query = userQuery.OrderByDescending(user => user.id).Select(user => new { fid = user.fatherId, user.id });

                var userList = query.ToList();
                Assert.AreEqual(6, userList.Count);
                Assert.AreEqual(6, userList[0].id);
            }
        }



        [TestMethod]
        public void Test_Count()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            // Count
            {
                var query = userQuery.Where(user => user.id > 2);

                var count = query.Count();
                Assert.AreEqual(4, count);
            }
            // Skip Take Count
            {
                var query = userQuery.Where(user => user.id > 2);

                query = query.Skip(1).Take(10);

                var count = query.Count();
                Assert.AreEqual(3, count);
            }
        }


        [TestMethod]
        public void Test_TotalCount()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            // TotalCountAsync
            {
                var query = userQuery.Where(user => user.id > 2);

                var count = query.TotalCount();
                Assert.AreEqual(4, count);
            }

            // Skip Take TotalCountAsync
            {
                var query = userQuery.Where(user => user.id > 2);

                query = query.Skip(1).Take(10);

                var count = query.TotalCount();
                Assert.AreEqual(4, count);
            }
        }


        [TestMethod]
        public void Test_ToListAndTotal()
        {
            using var dbContext = DataSource.CreateDbContext();

            // ToListAndTotalCount
            {
                var query = dbContext.Query<User>().Where(user => user.id > 2).Skip(1).Take(2);
                var (list, totalCount) = query.ToListAndTotalCount();
                Assert.AreEqual(2, list.Count);
                Assert.AreEqual(4, totalCount);
            }
        }



        [TestMethod]
        public void Test_FirstOrDefault()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var id = userQuery.OrderBy(m => m.id).Select(u => u.id).FirstOrDefault();
                Assert.AreEqual(1, id);
            }

            {
                var user = userQuery.OrderBy(m => m.id).FirstOrDefault();
                Assert.AreEqual(1, user?.id);
            }

            {
                var user = userQuery.FirstOrDefault(user => user.id == 3);
                Assert.AreEqual(3, user?.id);
            }

            {
                var user = userQuery.FirstOrDefault(user => user.id == 13);
                Assert.AreEqual(null, user?.id);
            }

            {
                var user = userQuery.OrderByDescending(m => m.id).FirstOrDefault();
                Assert.AreEqual(6, user?.id);
            }

            {
                var user = userQuery.OrderBy(m => m.id).Skip(1).Take(2).FirstOrDefault();
                Assert.AreEqual(2, user?.id);
            }
        }


        [TestMethod]
        public void Test_First()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var user = userQuery.OrderBy(m => m.id).First();
                Assert.AreEqual(1, user?.id);
            }

            {
                var user = userQuery.First(user => user.id == 3);
                Assert.AreEqual(3, user?.id);
            }

            {
                try
                {
                    var user = userQuery.First(user => user.id == 13);
                    Assert.Fail("IQueryable.First should throw Exception");
                }
                catch (Exception ex) when (ex is not AssertFailedException)
                {
                }
            }

            {
                var user = userQuery.OrderBy(m => m.id).Skip(1).Take(2).First();
                Assert.AreEqual(2, user?.id);
            }
        }



        [TestMethod]
        public void Test_LastOrDefault()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var id = userQuery.OrderBy(m => m.id).Select(u => u.id).FirstOrDefault();
                Assert.AreEqual(1, id);
            }
            {
                var user = userQuery.OrderBy(m => m.id).LastOrDefault();
                Assert.AreEqual(6, user?.id);
            }

            {
                var user = userQuery.LastOrDefault(user => user.id == 3);
                Assert.AreEqual(3, user?.id);
            }

            {
                var user = userQuery.LastOrDefault(user => user.id == 13);
                Assert.AreEqual(null, user?.id);
            }

            {
                var user = userQuery.OrderByDescending(m => m.id).LastOrDefault();
                Assert.AreEqual(1, user?.id);
            }

            {
                var user = userQuery.OrderBy(m => m.id).Skip(1).Take(2).LastOrDefault();
                Assert.AreEqual(3, user?.id);
            }
        }


        [TestMethod]
        public void Test_Last()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var user = userQuery.OrderBy(m => m.id).Last();
                Assert.AreEqual(6, user?.id);
            }

            {
                var user = userQuery.Last(user => user.id == 3);
                Assert.AreEqual(3, user?.id);
            }

            {
                try
                {
                    var user = userQuery.Last(user => user.id == 13);
                    Assert.Fail("IQueryable.Last should throw Exception");
                }
                catch (Exception ex) when (ex is not AssertFailedException)
                {
                }
            }

            {
                var user = userQuery.OrderBy(m => m.id).Skip(1).Take(2).Last();
                Assert.AreEqual(3, user?.id);
            }
        }

        // Enumerable.ToArray
        [TestMethod]
        public void Test_Enumerable_ToArray()
        {
            using var dbContext = DataSource.CreateDbContext();
            var userQuery = dbContext.Query<User>();

            {
                var userList = userQuery.OrderBy(m => m.id).ToArray();
                Assert.AreEqual(6, userList.Length);
                Assert.AreEqual(1, userList.First().id);
                Assert.AreEqual(6, userList.Last().id);
            }

            {
                var userList = userQuery.OrderBy(m => m.id).Select(u => u.id).ToArray();
                Assert.AreEqual(6, userList.Length);
                Assert.AreEqual(1, userList.First());
                Assert.AreEqual(6, userList.Last());
            }
        }




    }
}