using BuildFlow.Shared.Domain.Common;
using BuildFlow.Shared.Infrastructure;
using File.Application.Common;
using File.Application.Features.Files.Commands;
using File.Application.Features.Files.Handlers;
using File.Application.Features.Folders.Commands;
using File.Application.Features.Folders.Handlers;
using File.Application.Features.Multipart.Commands;
using File.Application.Features.Multipart.DTOs;
using File.Application.Features.Multipart.Handlers;
using File.Domain.Entities.FileMeta;
using File.Domain.Entities.MultipartUploadSession;
using File.Domain.Values;
using File.Infrastructure.Persistence;
using File.Infrastructure.Storage;
using FluentAssertions;
using MediatR;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using Moq;
using Xunit;

namespace BuildFlow.File.Tests;

/// <summary>文件大小确认状态在上传路径与 EF 模型中的持久化契约测试。</summary>
public class FileSizeVerifiedTests
{
    private const string OwnerId = "user-001";
    private const string Bucket = "files";

    [Fact]
    public async Task DirectZeroByteUploadMarksSizeVerified()
    {
        var (db, s3, user) = CreateDependencies();
        var handler = new UploadFileCommandHandler(
            s3.Object,
            db,
            user.Object,
            CreateBucketResolver(),
            new Mock<IMediator>().Object);

        await handler.Handle(
            new UploadFileCommand("empty.txt", Stream.Null, "text/plain", 0),
            CancellationToken.None);

        var file = await db.Files.SingleAsync();
        file.Size.Should().Be(0);
        file.SizeVerified.Should().BeTrue();
    }

    [Fact]
    public async Task FolderUploadMarksSizeVerified()
    {
        var (db, s3, user) = CreateDependencies();
        var handler = new UploadToFolderCommandHandler(
            db,
            s3.Object,
            user.Object,
            CreateBucketResolver());

        await handler.Handle(
            new UploadToFolderCommand(
                Guid.NewGuid(),
                "report.pdf",
                new MemoryStream([1, 2, 3]),
                "application/pdf",
                3),
            CancellationToken.None);

        (await db.Files.SingleAsync()).SizeVerified.Should().BeTrue();
    }

    [Fact]
    public async Task CompletedMultipartUploadMarksSizeVerified()
    {
        var (db, s3, user) = CreateDependencies();
        db.UploadSessions.Add(new MultipartUploadSessionEntity
        {
            BucketName = Bucket,
            ObjectKey = "multipart-key",
            UploadId = "upload-1",
            OwnerId = OwnerId,
            Status = UploadSessionStatus.Active,
        });
        await db.SaveChangesAsync();
        var handler = new CompleteMultipartCommandHandler(
            s3.Object,
            db,
            user.Object,
            CreateBucketResolver());

        await handler.Handle(
            new CompleteMultipartCommand(
                "multipart-key",
                "upload-1",
                [new CompletedPartDto(1, "etag-1")],
                "archive.zip",
                1024),
            CancellationToken.None);

        (await db.Files.SingleAsync()).SizeVerified.Should().BeTrue();
    }

    [Fact]
    public void ModelHasPendingSizeVerificationIndex()
    {
        var (db, _, _) = CreateDependencies();
        var entity = db.Model.FindEntityType(typeof(FileMetaEntity));

        entity.Should().NotBeNull();
        var sizeVerified = entity!.FindProperty(nameof(FileMetaEntity.SizeVerified));
        sizeVerified.Should().NotBeNull();
        sizeVerified!.GetColumnName(StoreObjectIdentifier.Table("b_files", null))
            .Should().Be("size_verified");
        entity!.GetIndexes().Should().Contain(index =>
            index.Properties.Select(property => property.Name)
                .SequenceEqual(new[] { nameof(FileMetaEntity.SizeVerified), nameof(FileMetaEntity.CreatedAt) }));
    }

    private static (FileDbContext Db, Mock<IS3StorageService> S3, Mock<ICurrentUserContext> User)
        CreateDependencies()
    {
        var user = new Mock<ICurrentUserContext>();
        user.SetupGet(context => context.UserId).Returns(OwnerId);
        user.SetupGet(context => context.IPAddress).Returns("127.0.0.1");
        var options = new DbContextOptionsBuilder<FileDbContext>()
            .UseInMemoryDatabase($"file-size-verified-{Guid.NewGuid():N}")
            .AddInterceptors(new AuditInterceptor(user.Object))
            .Options;

        return (new FileDbContext(options), new Mock<IS3StorageService>(), user);
    }

    private static IBucketResolver CreateBucketResolver()
    {
        var resolver = new Mock<IBucketResolver>();
        resolver.Setup(x => x.GetDefaultBucketAsync(It.IsAny<CancellationToken>()))
            .ReturnsAsync(Bucket);
        return resolver.Object;
    }
}