// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Threading.Tasks;
using EntityFrameworkCore.Jet.Data;
using EntityFrameworkCore.Jet.FunctionalTests.TestUtilities;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.TestUtilities;
using Microsoft.Extensions.DependencyInjection;
using Xunit;
#nullable disable
namespace EntityFrameworkCore.Jet.FunctionalTests
{
    public class ComputedColumnTest : IAsyncLifetime
    {
        [ConditionalFact]
        public void Can_use_computed_columns()
        {
            var serviceProvider = new ServiceCollection()
                .AddEntityFrameworkJet()
                .BuildServiceProvider(validateScopes: true);

            using var context = new Context(serviceProvider, TestStore.Name);
            context.Database.EnsureCreatedResiliently();

            var entity = context.Add(
                new Entity
                {
                    P1 = 20,
                    P2 = 30,
                    P3 = 80
                }).Entity;

            context.SaveChanges();

            Assert.Equal(50, entity.P4);
            Assert.Equal(100, entity.P5);
        }

        [ConditionalFact]
        public void Can_use_computed_columns_with_null_values()
        {
            var serviceProvider = new ServiceCollection()
                .AddEntityFrameworkJet()
                .BuildServiceProvider(validateScopes: true);

            using var context = new Context(serviceProvider, TestStore.Name);
            context.Database.EnsureCreatedResiliently();

            var entity = context.Add(new Entity { P1 = 20, P2 = 30 }).Entity;

            context.SaveChanges();

            Assert.Equal(50, entity.P4);
            Assert.Null(entity.P5);
        }

        private class Context(IServiceProvider serviceProvider, string databaseName) : DbContext
        {
            public DbSet<Entity> Entities { get; set; }

            protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
                => optionsBuilder
                    .UseJet(JetTestStore.CreateConnectionString(databaseName), TestEnvironment.DataAccessProviderFactory, b => b.ApplyConfiguration())
                    .UseInternalServiceProvider(serviceProvider);

            protected override void OnModelCreating(ModelBuilder modelBuilder)
            {
                modelBuilder.Entity<Entity>()
                    .Property(e => e.P4)
                    .HasComputedColumnSql("P1 + P2");

                modelBuilder.Entity<Entity>()
                    .Property(e => e.P5)
                    .HasComputedColumnSql("P1 + P3");
            }
        }

        private class Entity
        {
            public int Id { get; set; }
            public int P1 { get; set; }
            public int P2 { get; set; }
            public int? P3 { get; set; }
            public int P4 { get; set; }
            public int? P5 { get; set; }
        }

        [Flags]
        public enum FlagEnum
        {
            None = 0x0,
            AValue = 0x1,
            BValue = 0x2
        }

        public class EnumItem
        {
            public int EnumItemId { get; set; }
            public FlagEnum FlagEnum { get; set; }
            public FlagEnum? OptionalFlagEnum { get; set; }
            public FlagEnum? CalculatedFlagEnum { get; set; }
        }

        private class NullableContext(IServiceProvider serviceProvider, string databaseName) : DbContext
        {
            public DbSet<EnumItem> EnumItems { get; set; }

            protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
                => optionsBuilder
                    .UseJet(JetTestStore.CreateConnectionString(databaseName), TestEnvironment.DataAccessProviderFactory, b => b.ApplyConfiguration())
                    .UseInternalServiceProvider(serviceProvider);

            protected override void OnModelCreating(ModelBuilder modelBuilder)
                => modelBuilder.Entity<EnumItem>()
                    .Property(entity => entity.CalculatedFlagEnum)
                    .HasComputedColumnSql("FlagEnum | OptionalFlagEnum");
        }

        [ConditionalFact]
        public void Can_use_computed_columns_with_nullable_enum()
        {
            var serviceProvider = new ServiceCollection()
                .AddEntityFrameworkJet()
                .BuildServiceProvider(validateScopes: true);

            using var context = new NullableContext(serviceProvider, TestStore.Name);
            context.Database.EnsureCreatedResiliently();

            var entity = context.EnumItems.Add(new EnumItem { FlagEnum = FlagEnum.AValue, OptionalFlagEnum = FlagEnum.BValue }).Entity;
            context.SaveChanges();

            Assert.Equal(FlagEnum.AValue | FlagEnum.BValue, entity.CalculatedFlagEnum);
        }

        protected JetTestStore TestStore { get; private set; }

        public async Task InitializeAsync()
            => TestStore = await JetTestStore.CreateInitializedAsync("ComputedColumnTest");

        public async Task DisposeAsync()
            => await TestStore.DisposeAsync();
    }
}