// 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
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using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Conventions;
using Microsoft.EntityFrameworkCore.Metadata.Conventions.Infrastructure;
using Microsoft.Extensions.DependencyInjection;
using MySql.Data.EntityFrameworkCore.Extensions;

namespace MySql.Data.EntityFrameworkCore.Metadata.Conventions
{
  /// <summary>
  ///     <para>
  ///         A builder for building conventions for MySQL.
  ///     </para>
  ///     <para>
  ///         The service lifetime is <see cref="ServiceLifetime.Scoped" /> and multiple registrations
  ///         are allowed. This means that each <see cref="DbContext" /> instance will use its own
  ///         set of instances of this service.
  ///         The implementations may depend on other services registered with any lifetime.
  ///         The implementations do not need to be thread-safe.
  ///     </para>
  /// </summary>
  internal class MySQLConventionSetBuilder : RelationalConventionSetBuilder
  {
    public MySQLConventionSetBuilder(
      [NotNull] ProviderConventionSetBuilderDependencies dependencies,
      [NotNull] RelationalConventionSetBuilderDependencies relationalDependencies)
      : base(dependencies, relationalDependencies)
    {
    }

    /// <summary>
    /// Builds and returns the convention set for MySQL.
    /// </summary>
    /// <returns> The convention set for MySQL. </returns>
    public override ConventionSet CreateConventionSet()
    {
      var conventionSet = base.CreateConventionSet();

      conventionSet.ModelInitializedConventions.Add(new RelationalMaxIdentifierLengthConvention(64, Dependencies, RelationalDependencies));

      ValueGenerationConvention valueGeneratorConvention = new MySQLValueGenerationConvention(Dependencies, RelationalDependencies);
      ReplaceConvention(conventionSet.EntityTypeBaseTypeChangedConventions, valueGeneratorConvention);
      ReplaceConvention(conventionSet.EntityTypePrimaryKeyChangedConventions, valueGeneratorConvention);
      ReplaceConvention(conventionSet.ForeignKeyAddedConventions, valueGeneratorConvention);
      ReplaceConvention(conventionSet.ForeignKeyRemovedConventions, valueGeneratorConvention);

      conventionSet.PropertyAnnotationChangedConventions.Add((MySQLValueGenerationConvention)valueGeneratorConvention);
      conventionSet.PropertyAddedConventions.Add(new MySqlCharsetAttributeConvention(Dependencies));
      conventionSet.PropertyAddedConventions.Add(new MySqlCollationAttributeConvention(Dependencies));
      conventionSet.EntityTypeAddedConventions.Add(new MySqlEntityCharsetAttributeConvention(Dependencies));
      conventionSet.EntityTypeAddedConventions.Add(new MySqlEntityCollationAttributeConvention(Dependencies));

      return conventionSet;
    }

    /// <summary>
    /// <para>
    /// Call this method to build a <see cref="ConventionSet" /> for MySQL Server when using
    /// the <see cref="ModelBuilder" /> outside of <see cref="DbContext.OnModelCreating" />.
    /// </para>
    /// <para>
    /// Note that it is unusual to use this method.
    /// Consider using <see cref="DbContext" /> in the normal way instead.
    /// </para>
    /// </summary>
    /// <returns> The convention set. </returns>
    public static ConventionSet Build()
    {
      var serviceProvider = new ServiceCollection()
          .AddEntityFrameworkMySQL()
          .AddDbContext<DbContext>(o => o.UseMySQL("Server=."))
          .BuildServiceProvider();

      using (var serviceScope = serviceProvider.GetRequiredService<IServiceScopeFactory>().CreateScope())
      {
        using (var context = serviceScope.ServiceProvider.GetService<DbContext>())
        {
          return ConventionSet.CreateConventionSet(context);
        }
      }
    }
  }
}
