// Licensed to the .NET Foundation under one or more agreements.

// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.EntityFrameworkCore.ChangeTracking.Internal;

namespace Microsoft.EntityFrameworkCore.Diagnostics;

/// <summary>

/// A <see cref="DiagnosticSource" /> event payload used when a <see cref="DbUpdateConcurrencyException" /> is being thrown.

/// </summary>

/// <remarks>

/// See <see href="https://aka.ms/efcore-docs-diagnostics">Logging, events, and diagnostics</see> for more information and examples.

/// </remarks>

public class ConcurrencyExceptionEventData : DbContextErrorEventData

{

private readonly IReadOnlyList<IUpdateEntry> _internalEntries;

/// <summary>

/// Constructs the event payload.

/// </summary>

/// <param name="eventDefinition">The event definition.</param>

/// <param name="messageGenerator">A delegate that generates a log message for this event.</param>

/// <param name="context">The current <see cref="DbContext" />.</param>

/// <param name="entries">The entries that were involved in the concurrency violation.</param>

/// <param name="exception">The exception that will be thrown, unless throwing is suppressed.</param>

public ConcurrencyExceptionEventData(

EventDefinitionBase eventDefinition,

Func<EventDefinitionBase, EventData, string> messageGenerator,

DbContext context,

IReadOnlyList<IUpdateEntry> entries,

DbUpdateConcurrencyException exception)

: base(eventDefinition, messageGenerator, context, exception)

=> _internalEntries = entries;

/// <summary>

/// The exception that will be thrown, unless throwing is suppressed.

/// </summary>

public new virtual DbUpdateConcurrencyException Exception

=> (DbUpdateConcurrencyException)base.Exception;

/// <summary>

/// The entries that were involved in the concurrency violation.

/// </summary>

[field: AllowNull, MaybeNull]

public virtual IReadOnlyList<EntityEntry> Entries

=> field ??= _internalEntries.Select(e => new EntityEntry((InternalEntityEntry)e)).ToList();

}