using File.Application.Features.Files.Commands;
using File.Application.Features.Files.Handlers;
using File.Application.Features.Files.Services;
using File.Domain.Entities.FileMeta;
using File.Infrastructure.Persistence;
using File.Infrastructure.Storage;
using FluentAssertions;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;

namespace BuildFlow.File.Tests;

/// <summary>
/// ProcessUnverifiedFileSizesCommandHandler 测试。该 Handler 仅将命令委托给
/// FileSizeVerificationProcessor，故覆盖：成功回填大小 + 委托层对越界参数的前置校验。
/// </summary>
public class ProcessUnverifiedFileSizesCommandHandlerTests
{
    private static FileSizeVerificationProcessor NewProcessor(FileDbContext db, Mock<IS3StorageService> s3)
        => new(db, s3.Object, NullLogger<FileSizeVerificationProcessor>.Instance);

    private static FileMetaEntity NewUnverifiedFile()
        => new()
        {
            Name = "f.bin",
            S3Key = Guid.NewGuid().ToString(),
            S3Bucket = "files",
            ContentType = "application/octet-stream",
            OwnerId = "user-001",
            Size = 0,
            SizeVerified = false,
        };

    [Fact]
    public async Task Process_存在未确认文件_经S3回填大小并标记已确认()
    {
        await using var db = FileTestDb.Create();
        var file = NewUnverifiedFile();
        db.Files.Add(file);
        await db.SaveChangesAsync();

        var s3 = new Mock<IS3StorageService>();
        s3.Setup(x => x.GetObjectSizeAsync(file.S3Bucket, file.S3Key, It.IsAny<CancellationToken>()))
          .ReturnsAsync(2048L);

        var handler = new ProcessUnverifiedFileSizesCommandHandler(NewProcessor(db, s3));

        var processed = await handler.Handle(new ProcessUnverifiedFileSizesCommand(100, 4), CancellationToken.None);

        processed.Should().Be(1, "应处理 1 个未确认文件");
        // file 为同一 DbContext 跟踪的实例，处理器 SaveChangesAsync 后属性已更新
        file.Size.Should().Be(2048L);
        file.SizeVerified.Should().BeTrue("大小应被标记已确认");
    }

    [Fact]
    public async Task Process_批量大小越界_委托处理器抛出参数范围异常()
    {
        await using var db = FileTestDb.Create();
        var handler = new ProcessUnverifiedFileSizesCommandHandler(NewProcessor(db, new Mock<IS3StorageService>()));

        var act = async () => await handler.Handle(
            new ProcessUnverifiedFileSizesCommand(0, 4), CancellationToken.None);

        // 越界校验在依赖（S3/DB）调用之前，可在 InMemory 直接覆盖。
        await act.Should().ThrowAsync<ArgumentOutOfRangeException>();
    }
}