// Copyright (c) 2020 Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0, as
// published by the Free Software Foundation.
//
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using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Update;
using MySql.EntityFrameworkCore.Infrastructure.Internal;
using MySql.EntityFrameworkCore.Utils;
using System.Linq;

namespace MySql.EntityFrameworkCore.Update
{
  /// <summary>
  /// IModificationCommandBatchFactory implemntation for MySQL
  /// </summary>
  internal class MySQLModificationCommandBatchFactory : IModificationCommandBatchFactory
  {
    private readonly ModificationCommandBatchFactoryDependencies _dependencies;
    private readonly IDbContextOptions _options;

    /// <summary>
    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
    ///     any release. You should only use it directly in your code with extreme caution and knowing that
    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
    /// </summary>
    public MySQLModificationCommandBatchFactory(
            [NotNull] ModificationCommandBatchFactoryDependencies dependencies,
            [NotNull] IDbContextOptions options)
    {
      Check.NotNull(dependencies, nameof(dependencies));
      Check.NotNull(options, nameof(options));

      _dependencies = dependencies;
      _options = options;
    }

    /// <summary>
    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
    ///     any release. You should only use it directly in your code with extreme caution and knowing that
    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
    /// </summary>
    public virtual ModificationCommandBatch Create()
    {
      var optionsExtension = _options.Extensions.OfType<MySQLOptionsExtension>().FirstOrDefault();

      return new MySQLModificationCommandBatch(_dependencies, optionsExtension?.MaxBatchSize);
    }
  }
}
