using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using Xunit;

namespace Dapper.Tests
{
    [Collection("MultiMapTests")]
    public sealed class SystemSqlClientMultiMapTests : MultiMapTests<SystemSqlClientProvider> { }
#if MSSQLCLIENT
    [Collection("MultiMapTests")]
    public sealed class MicrosoftSqlClientMultiMapTests : MultiMapTests<MicrosoftSqlClientProvider> { }
#endif
    public abstract class MultiMapTests<TProvider> : TestBase<TProvider> where TProvider : DatabaseProvider
    {
        [Fact]
        public void ParentChildIdentityAssociations()
        {
            var lookup = new Dictionary<int, Parent>();
            var parents = connection.Query<Parent, Child, Parent>("select 1 as [Id], 1 as [Id] union all select 1,2 union all select 2,3 union all select 1,4 union all select 3,5",
                (parent, child) =>
                {
                    if (!lookup.TryGetValue(parent.Id, out Parent? found))
                    {
                        lookup.Add(parent.Id, found = parent);
                    }
                    found.Children.Add(child);
                    return found;
                }).Distinct().ToDictionary(p => p.Id);
            Assert.Equal(3, parents.Count);
            Assert.True(parents[1].Children.Select(c => c.Id).SequenceEqual(new[] { 1, 2, 4 }));
            Assert.True(parents[2].Children.Select(c => c.Id).SequenceEqual(new[] { 3 }));
            Assert.True(parents[3].Children.Select(c => c.Id).SequenceEqual(new[] { 5 }));
        }

        private class Parent
        {
            public int Id { get; set; }
            public readonly List<Child> Children = new List<Child>();
        }

        private class Child
        {
            public int Id { get; set; }
        }

        [Fact]
        public void TestMultiMap()
        {
            const string createSql = @"
                create table #Users (Id int, Name varchar(20))
                create table #Posts (Id int, OwnerId int, Content varchar(20))

                insert #Users values(99, 'Sam')
                insert #Users values(2, 'I am')

                insert #Posts values(1, 99, 'Sams Post1')
                insert #Posts values(2, 99, 'Sams Post2')
                insert #Posts values(3, null, 'no ones post')
";
            connection.Execute(createSql);
            try
            {
                const string sql =
    @"select * from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id";

                var data = connection.Query<Post, User, Post>(sql, (post, user) => { post.Owner = user; return post; }).ToList();
                var p = data[0];

                Assert.Equal("Sams Post1", p.Content);
                Assert.Equal(1, p.Id);
                Assert.NotNull(p.Owner);
                Assert.Equal("Sam", p.Owner.Name);
                Assert.Equal(99, p.Owner.Id);

                Assert.Null(data[2].Owner);
            }
            finally
            {
                connection.Execute("drop table #Users drop table #Posts");
            }
        }

        [Fact]
        public void TestSchemaChangedMultiMap()
        {
            connection.Execute("create table #dog(Age int, Name nvarchar(max)) insert #dog values(1, 'Alf')");
            try
            {
                var tuple = connection.Query<Dog, Dog, Tuple<Dog, Dog>>("select * from #dog d1 join #dog d2 on 1=1", Tuple.Create, splitOn: "Age").Single();

                Assert.Equal("Alf", tuple.Item1.Name);
                Assert.Equal(1, tuple.Item1.Age);
                Assert.Equal("Alf", tuple.Item2.Name);
                Assert.Equal(1, tuple.Item2.Age);

                connection.Execute("alter table #dog drop column Name");
                tuple = connection.Query<Dog, Dog, Tuple<Dog, Dog>>("select * from #dog d1 join #dog d2 on 1=1", Tuple.Create, splitOn: "Age").Single();

                Assert.Null(tuple.Item1.Name);
                Assert.Equal(1, tuple.Item1.Age);
                Assert.Null(tuple.Item2.Name);
                Assert.Equal(1, tuple.Item2.Age);
            }
            finally
            {
                connection.Execute("drop table #dog");
            }
        }

        [Fact]
        public void TestReadMultipleIntegersWithSplitOnAny()
        {
            Assert.Equal(
                new[] { Tuple.Create(1, 2, 3), Tuple.Create(4, 5, 6) },
                connection.Query<int, int, int, Tuple<int, int, int>>("select 1,2,3 union all select 4,5,6", Tuple.Create, splitOn: "*")
            );
        }

        private class Multi1
        {
            public int Id { get; set; }
        }

        private class Multi2
        {
            public int Id { get; set; }
        }

        [Fact]
        public void QueryMultimapFromClosed()
        {
            using var conn = GetClosedConnection();
            Assert.Equal(ConnectionState.Closed, conn.State);
            var i = conn.Query<Multi1, Multi2, int>("select 2 as [Id], 3 as [Id]", (x, y) => x.Id + y.Id).Single();
            Assert.Equal(ConnectionState.Closed, conn.State);
            Assert.Equal(5, i);
        }

        [Fact]
        public void TestMultiMapThreeTypesWithGridReader()
        {
            const string createSql = @"
                create table #Users (Id int, Name varchar(20))
                create table #Posts (Id int, OwnerId int, Content varchar(20))
                create table #Comments (Id int, PostId int, CommentData varchar(20))

                insert #Users values(99, 'Sam')
                insert #Users values(2, 'I am')

                insert #Posts values(1, 99, 'Sams Post1')
                insert #Posts values(2, 99, 'Sams Post2')
                insert #Posts values(3, null, 'no ones post')

                insert #Comments values(1, 1, 'Comment 1')";
            connection.Execute(createSql);
            try
            {
                const string sql = @"SELECT p.* FROM #Posts p

select p.*, u.Id, u.Name + '0' Name, c.Id, c.CommentData from #Posts p 
left join #Users u on u.Id = p.OwnerId 
left join #Comments c on c.PostId = p.Id
where p.Id = 1
Order by p.Id";

                var grid = connection.QueryMultiple(sql);

                var post1 = grid.Read<Post>().ToList();

                var post2 = grid.Read<Post, User, Comment, Post>((post, user, comment) => { post.Owner = user; post.Comment = comment; return post; }).SingleOrDefault();

                Assert.NotNull(post2);
                Assert.NotNull(post2.Comment);
                Assert.Equal(1, post2.Comment.Id);
                Assert.NotNull(post2.Owner);
                Assert.Equal(99, post2.Owner.Id);
            }
            finally
            {
                connection.Execute("drop table #Users drop table #Posts drop table #Comments");
            }
        }

        [Fact]
        public void TestMultiMapperIsNotConfusedWithUnorderedCols()
        {
            var result = connection.Query<Foo1, Bar1, Tuple<Foo1, Bar1>>("select 1 as Id, 2 as BarId, 3 as BarId, 'a' as Name", Tuple.Create, splitOn: "BarId").First();

            Assert.Equal(1, result.Item1.Id);
            Assert.Equal(2, result.Item1.BarId);
            Assert.Equal(3, result.Item2.BarId);
            Assert.Equal("a", result.Item2.Name);
        }

        [Fact]
        public void TestMultiMapperSplitOnError()
        {
            var ex = Assert.Throws<ArgumentException>(() => connection.Query<Foo1, Bar1, Tuple<Foo1, Bar1>>("select 1 as Id, 2 as BarId", Tuple.Create, splitOn: "DoesntExist").First());
            Assert.StartsWith("Multi-map error: splitOn column 'DoesntExist' was not found - please ensure your splitOn parameter is set and in the correct order", ex.Message);
        }

        [Fact]
        public void TestMultiMapDynamic()
        {
            const string createSql = @"
                create table #Users (Id int, Name varchar(20))
                create table #Posts (Id int, OwnerId int, Content varchar(20))

                insert #Users values(99, 'Sam')
                insert #Users values(2, 'I am')

                insert #Posts values(1, 99, 'Sams Post1')
                insert #Posts values(2, 99, 'Sams Post2')
                insert #Posts values(3, null, 'no ones post')
";
            connection.Execute(createSql);

            const string sql =
@"select * from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id";

            var data = connection.Query<dynamic, dynamic, dynamic>(sql, (post, user) => { post.Owner = user; return post; }).ToList();
            var p = data[0];

            // hairy extension method support for dynamics
            Assert.Equal("Sams Post1", (string)p.Content);
            Assert.Equal(1, (int)p.Id);
            Assert.Equal("Sam", (string)p.Owner.Name);
            Assert.Equal(99, (int)p.Owner.Id);

            Assert.Null((object)data[2].Owner);

            connection.Execute("drop table #Users drop table #Posts");
        }

        [Fact]
        public void TestMultiMapWithSplit() // https://stackoverflow.com/q/6056778/23354
        {
            const string sql = "select 1 as id, 'abc' as name, 2 as id, 'def' as name";
            var product = connection.Query<Product, Category, Product>(sql, (prod, cat) =>
            {
                prod.Category = cat;
                return prod;
            }).First();
            // assertions
            Assert.Equal(1, product.Id);
            Assert.Equal("abc", product.Name);
            Assert.NotNull(product.Category);
            Assert.Equal(2, product.Category.Id);
            Assert.Equal("def", product.Category.Name);
        }

        [Fact]
        public void TestMultiMapWithSplitWithNullValue() // https://stackoverflow.com/q/10744728/449906
        {
            const string sql = "select 1 as id, 'abc' as name, NULL as description, 'def' as name";
            var product = connection.Query<Product, Category, Product>(sql, (prod, cat) =>
            {
                prod.Category = cat;
                return prod;
            }, splitOn: "description").First();
            // assertions
            Assert.Equal(1, product.Id);
            Assert.Equal("abc", product.Name);
            Assert.Null(product.Category);
        }

        [Fact]
        public void TestMultiMapWithSplitWithNullValueAndSpoofColumn() // https://stackoverflow.com/q/10744728/449906
        {
            const string sql = "select 1 as id, 'abc' as name, 1 as spoof, NULL as description, 'def' as name";
            var product = connection.Query<Product, Category, Product>(sql, (prod, cat) =>
            {
                prod.Category = cat;
                return prod;
            }, splitOn: "spoof").First();
            // assertions
            Assert.Equal(1, product.Id);
            Assert.Equal("abc", product.Name);
            Assert.NotNull(product.Category);
            Assert.Equal(0, product.Category.Id);
            Assert.Equal("def", product.Category.Name);
            Assert.Null(product.Category.Description);
        }

        [Fact]
        public void TestMultiMappingVariations()
        {
            const string sql = "select 1 as Id, 'a' as Content, 2 as Id, 'b' as Content, 3 as Id, 'c' as Content, 4 as Id, 'd' as Content, 5 as Id, 'e' as Content";

            var order = connection.Query<dynamic, dynamic, dynamic, dynamic>(sql, (o, owner, creator) => { o.Owner = owner; o.Creator = creator; return o; }).First();

            Assert.Equal(order.Id, 1);
            Assert.Equal(order.Content, "a");
            Assert.Equal(order.Owner.Id, 2);
            Assert.Equal(order.Owner.Content, "b");
            Assert.Equal(order.Creator.Id, 3);
            Assert.Equal(order.Creator.Content, "c");

            order = connection.Query<dynamic, dynamic, dynamic, dynamic, dynamic>(sql, (o, owner, creator, address) =>
            {
                o.Owner = owner;
                o.Creator = creator;
                o.Owner.Address = address;
                return o;
            }).First();

            Assert.Equal(order.Id, 1);
            Assert.Equal(order.Content, "a");
            Assert.Equal(order.Owner.Id, 2);
            Assert.Equal(order.Owner.Content, "b");
            Assert.Equal(order.Creator.Id, 3);
            Assert.Equal(order.Creator.Content, "c");
            Assert.Equal(order.Owner.Address.Id, 4);
            Assert.Equal(order.Owner.Address.Content, "d");

            order = connection.Query<dynamic, dynamic, dynamic, dynamic, dynamic, dynamic>(sql, (a, b, c, d, e) => { a.B = b; a.C = c; a.C.D = d; a.E = e; return a; }).First();

            Assert.Equal(order.Id, 1);
            Assert.Equal(order.Content, "a");
            Assert.Equal(order.B.Id, 2);
            Assert.Equal(order.B.Content, "b");
            Assert.Equal(order.C.Id, 3);
            Assert.Equal(order.C.Content, "c");
            Assert.Equal(order.C.D.Id, 4);
            Assert.Equal(order.C.D.Content, "d");
            Assert.Equal(order.E.Id, 5);
            Assert.Equal(order.E.Content, "e");
        }

        private class UserWithConstructor
        {
            public UserWithConstructor(int id, string name)
            {
                Ident = id;
                FullName = name;
            }

            public int Ident { get; set; }
            public string FullName { get; set; }
        }

        private class PostWithConstructor
        {
            public PostWithConstructor(int id, int ownerid, string content)
            {
                Ident = id;
                FullContent = content;
            }

            public int Ident { get; set; }
            public UserWithConstructor? Owner { get; set; }
            public string FullContent { get; set; }
            public Comment? Comment { get; set; }
        }

        [Fact]
        public void TestMultiMapWithConstructor()
        {
            const string createSql = @"
                create table #Users (Id int, Name varchar(20))
                create table #Posts (Id int, OwnerId int, Content varchar(20))

                insert #Users values(99, 'Sam')
                insert #Users values(2, 'I am')

                insert #Posts values(1, 99, 'Sams Post1')
                insert #Posts values(2, 99, 'Sams Post2')
                insert #Posts values(3, null, 'no ones post')";
            connection.Execute(createSql);
            try
            {
                const string sql = @"select * from #Posts p 
                           left join #Users u on u.Id = p.OwnerId 
                           Order by p.Id";
                PostWithConstructor[] data = connection.Query<PostWithConstructor, UserWithConstructor, PostWithConstructor>(sql, (post, user) => { post.Owner = user; return post; }).ToArray();
                var p = data.First();

                Assert.Equal("Sams Post1", p.FullContent);
                Assert.Equal(1, p.Ident);
                Assert.NotNull(p.Owner);
                Assert.Equal("Sam", p.Owner.FullName);
                Assert.Equal(99, p.Owner.Ident);

                Assert.Null(data[2].Owner);
            }
            finally
            {
                connection.Execute("drop table #Users drop table #Posts");
            }
        }

        [Fact]
        public void TestMultiMapArbitraryMaps()
        {
            // please excuse the trite example, but it is easier to follow than a more real-world one
            const string createSql = @"
                create table #ReviewBoards (Id int, Name varchar(20), User1Id int, User2Id int, User3Id int, User4Id int, User5Id int, User6Id int, User7Id int, User8Id int, User9Id int)
                create table #Users (Id int, Name varchar(20))

                insert #Users values(1, 'User 1')
                insert #Users values(2, 'User 2')
                insert #Users values(3, 'User 3')
                insert #Users values(4, 'User 4')
                insert #Users values(5, 'User 5')
                insert #Users values(6, 'User 6')
                insert #Users values(7, 'User 7')
                insert #Users values(8, 'User 8')
                insert #Users values(9, 'User 9')

                insert #ReviewBoards values(1, 'Review Board 1', 1, 2, 3, 4, 5, 6, 7, 8, 9)
";
            connection.Execute(createSql);
            try
            {
                const string sql = @"
                    select 
                        rb.Id, rb.Name,
                        u1.*, u2.*, u3.*, u4.*, u5.*, u6.*, u7.*, u8.*, u9.*
                    from #ReviewBoards rb
                        inner join #Users u1 on u1.Id = rb.User1Id
                        inner join #Users u2 on u2.Id = rb.User2Id
                        inner join #Users u3 on u3.Id = rb.User3Id
                        inner join #Users u4 on u4.Id = rb.User4Id
                        inner join #Users u5 on u5.Id = rb.User5Id
                        inner join #Users u6 on u6.Id = rb.User6Id
                        inner join #Users u7 on u7.Id = rb.User7Id
                        inner join #Users u8 on u8.Id = rb.User8Id
                        inner join #Users u9 on u9.Id = rb.User9Id
";

                var types = new[] { typeof(ReviewBoard), typeof(User), typeof(User), typeof(User), typeof(User), typeof(User), typeof(User), typeof(User), typeof(User), typeof(User) };

                Func<object[], ReviewBoard> mapper = (objects) =>
                {
                    var board = (ReviewBoard)objects[0];
                    board.User1 = (User)objects[1];
                    board.User2 = (User)objects[2];
                    board.User3 = (User)objects[3];
                    board.User4 = (User)objects[4];
                    board.User5 = (User)objects[5];
                    board.User6 = (User)objects[6];
                    board.User7 = (User)objects[7];
                    board.User8 = (User)objects[8];
                    board.User9 = (User)objects[9];
                    return board;
                };

                var data = connection.Query<ReviewBoard>(sql, types, mapper).ToList();

                var p = data[0];
                Assert.Equal(1, p.Id);
                Assert.Equal("Review Board 1", p.Name);
                Assert.NotNull(p.User1);
                Assert.NotNull(p.User2);
                Assert.NotNull(p.User3);
                Assert.NotNull(p.User4);
                Assert.NotNull(p.User5);
                Assert.NotNull(p.User6);
                Assert.NotNull(p.User7);
                Assert.NotNull(p.User8);
                Assert.NotNull(p.User9);
                Assert.Equal(1, p.User1.Id);
                Assert.Equal(2, p.User2.Id);
                Assert.Equal(3, p.User3.Id);
                Assert.Equal(4, p.User4.Id);
                Assert.Equal(5, p.User5.Id);
                Assert.Equal(6, p.User6.Id);
                Assert.Equal(7, p.User7.Id);
                Assert.Equal(8, p.User8.Id);
                Assert.Equal(9, p.User9.Id);
                Assert.Equal("User 1", p.User1.Name);
                Assert.Equal("User 2", p.User2.Name);
                Assert.Equal("User 3", p.User3.Name);
                Assert.Equal("User 4", p.User4.Name);
                Assert.Equal("User 5", p.User5.Name);
                Assert.Equal("User 6", p.User6.Name);
                Assert.Equal("User 7", p.User7.Name);
                Assert.Equal("User 8", p.User8.Name);
                Assert.Equal("User 9", p.User9.Name);
            }
            finally
            {
                connection.Execute("drop table #Users drop table #ReviewBoards");
            }
        }

        [Fact]
        public void TestMultiMapGridReader()
        {
            const string createSql = @"
                create table #Users (Id int, Name varchar(20))
                create table #Posts (Id int, OwnerId int, Content varchar(20))

                insert #Users values(99, 'Sam')
                insert #Users values(2, 'I am')

                insert #Posts values(1, 99, 'Sams Post1')
                insert #Posts values(2, 99, 'Sams Post2')
                insert #Posts values(3, null, 'no ones post')
";
            connection.Execute(createSql);

            const string sql =
@"select p.*, u.Id, u.Name + '0' Name from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id

select p.*, u.Id, u.Name + '1' Name from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id
";

            var grid = connection.QueryMultiple(sql);

            for (int i = 0; i < 2; i++)
            {
                var data = grid.Read<Post, User, Post>((post, user) => { post.Owner = user; return post; }).ToList();
                var p = data[0];

                Assert.Equal("Sams Post1", p.Content);
                Assert.Equal(1, p.Id);
                Assert.NotNull(p.Owner);
                Assert.Equal(p.Owner.Name, "Sam" + i);
                Assert.Equal(99, p.Owner.Id);

                Assert.Null(data[2].Owner);
            }

            connection.Execute("drop table #Users drop table #Posts");
        }

        [Fact]
        public void TestFlexibleMultiMapping()
        {
            const string sql =
@"select 
    1 as PersonId, 'bob' as Name, 
    2 as AddressId, 'abc street' as Name, 1 as PersonId,
    3 as Id, 'fred' as Name
    ";
            var personWithAddress = connection.Query<Person, Address, Extra, Tuple<Person, Address, Extra>>
                (sql, Tuple.Create, splitOn: "AddressId,Id").First();

            Assert.Equal(1, personWithAddress.Item1.PersonId);
            Assert.Equal("bob", personWithAddress.Item1.Name);
            Assert.Equal(2, personWithAddress.Item2.AddressId);
            Assert.Equal("abc street", personWithAddress.Item2.Name);
            Assert.Equal(1, personWithAddress.Item2.PersonId);
            Assert.Equal(3, personWithAddress.Item3.Id);
            Assert.Equal("fred", personWithAddress.Item3.Name);
        }

        [Fact]
        public void TestMultiMappingWithSplitOnSpaceBetweenCommas()
        {
            const string sql = @"select 
                        1 as PersonId, 'bob' as Name, 
                        2 as AddressId, 'abc street' as Name, 1 as PersonId,
                        3 as Id, 'fred' as Name
                        ";
            var personWithAddress = connection.Query<Person, Address, Extra, Tuple<Person, Address, Extra>>
                (sql, Tuple.Create, splitOn: "AddressId, Id").First();

            Assert.Equal(1, personWithAddress.Item1.PersonId);
            Assert.Equal("bob", personWithAddress.Item1.Name);
            Assert.Equal(2, personWithAddress.Item2.AddressId);
            Assert.Equal("abc street", personWithAddress.Item2.Name);
            Assert.Equal(1, personWithAddress.Item2.PersonId);
            Assert.Equal(3, personWithAddress.Item3.Id);
            Assert.Equal("fred", personWithAddress.Item3.Name);
        }

        private class Extra
        {
            public int Id { get; set; }
            public string? Name { get; set; }
        }

        [Fact]
        public void TestMultiMappingWithNonReturnedProperty()
        {
            const string sql = @"select 
                            1 as PostId, 'Title' as Title,
                            2 as BlogId, 'Blog' as Title";
            var postWithBlog = connection.Query<Post_DupeProp, Blog_DupeProp, Post_DupeProp>(sql,
                (p, b) =>
                {
                    p.Blog = b;
                    return p;
                }, splitOn: "BlogId").First();

            Assert.Equal(1, postWithBlog.PostId);
            Assert.Equal("Title", postWithBlog.Title);
            Assert.NotNull(postWithBlog.Blog);
            Assert.Equal(2, postWithBlog.Blog.BlogId);
            Assert.Equal("Blog", postWithBlog.Blog.Title);
        }

        private class Post_DupeProp
        {
            public int PostId { get; set; }
            public string? Title { get; set; }
            public int BlogId { get; set; }
            public Blog_DupeProp? Blog { get; set; }
        }

        private class Blog_DupeProp
        {
            public int BlogId { get; set; }
            public string? Title { get; set; }
        }

        // see https://stackoverflow.com/questions/16955357/issue-about-dapper
        [Fact]
        public void TestSplitWithMissingMembers()
        {
            var result = connection.Query<Topic, Profile, Topic>(
            @"select 123 as ID, 'abc' as Title,
                     cast('01 Feb 2013' as datetime) as CreateDate,
                     'ghi' as Name, 'def' as Phone",
            (T, P) => { T.Author = P; return T; },
            null, null, true, "ID,Name").Single();

            Assert.Equal(123, result.ID);
            Assert.Equal("abc", result.Title);
            Assert.Equal(new DateTime(2013, 2, 1), result.CreateDate);
            Assert.Null(result.Name);
            Assert.Null(result.Content);

            Assert.NotNull(result.Author);
            Assert.Equal("def", result.Author.Phone);
            Assert.Equal("ghi", result.Author.Name);
            Assert.Equal(0, result.Author.ID);
            Assert.Null(result.Author.Address);
        }

        public class Profile
        {
            public int ID { get; set; }
            public string? Name { get; set; }
            public string? Phone { get; set; }
            public string? Address { get; set; }
            //public ExtraInfo Extra { get; set; }
        }

        public class Topic
        {
            public int ID { get; set; }
            public string? Title { get; set; }
            public DateTime CreateDate { get; set; }
            public string? Content { get; set; }
            public int UID { get; set; }
            public int TestColum { get; set; }
            public string? Name { get; set; }
            public Profile? Author { get; set; }
            //public Attachment Attach { get; set; }
        }

        [Fact]
        public void TestInvalidSplitCausesNiceError()
        {
            try
            {
                connection.Query<User, User, User>("select 1 A, 2 B, 3 C", (x, y) => x);
            }
            catch (ArgumentException)
            {
                // expecting an app exception due to multi mapping being bodged 
            }

            try
            {
                connection.Query<dynamic, dynamic, dynamic>("select 1 A, 2 B, 3 C", (x, y) => x);
            }
            catch (ArgumentException)
            {
                // expecting an app exception due to multi mapping being bodged 
            }
        }
    }
}