using BuildFlow.Shared.Domain.Common;
using BuildFlow.Shared.Infrastructure;
using File.Application.Features.Multipart.Commands;
using File.Application.Features.Multipart.DTOs;
using File.Application.Features.Multipart.Handlers;
using File.Domain.Entities;
using File.Infrastructure.Persistence;
using File.Infrastructure.Storage;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Moq;
using Xunit;

namespace BuildFlow.File.Tests;

/// <summary>
/// 秒传在分片上传路径的端到端测试。覆盖缺陷 2、3 的修复：
/// - InitMultipart 命中同用户同哈希同大小文件 → Instant=true（缺陷3：三元组判定）
/// - CompleteMultipart 完成后落 FileMeta（缺陷2：分片秒传数据来源）
/// 两者串联验证：分片上传完成后，再次 init 同文件能命中秒传。
/// </summary>
public class InstantUploadTests
{
    private const string OwnerId = "user-001";
    private const string Sha = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824";

    private static (FileDbContext db, Mock<IS3StorageService> s3, Mock<ICurrentUserContext> user) CreateDeps(string dbName)
    {
        var user = new Mock<ICurrentUserContext>();
        user.SetupGet(u => u.UserId).Returns(OwnerId);
        user.SetupGet(u => u.IPAddress).Returns("127.0.0.1");
        var options = new DbContextOptionsBuilder<FileDbContext>()
            .UseInMemoryDatabase(dbName)
            .AddInterceptors(new AuditInterceptor(user.Object))
            .Options;
        return (new FileDbContext(options), new Mock<IS3StorageService>(), user);
    }

    [Fact]
    public async Task Init_同用户同哈希同大小文件存在_返回Instant秒传()
    {
        var (db, s3, user) = CreateDeps(nameof(Init_同用户同哈希同大小文件存在_返回Instant秒传));
        // 预置一条已存在的文件（模拟此前上传完成）
        db.Files.Add(new FileMeta
        {
            Name = "a.bin", S3Key = "k1", S3Bucket = "files",
            Size = 1024, ContentType = "application/octet-stream",
            ContentHash = Sha, OwnerId = OwnerId,
        });
        await db.SaveChangesAsync();

        var handler = new InitMultipartCommandHandler(s3.Object, db, user.Object);

        var result = await handler.Handle(new InitMultipartCommand("files", "obj", Sha, TotalParts: 1, Size: 1024), CancellationToken.None);

        result.Instant.Should().BeTrue("同用户同哈希同大小应命中秒传");
        result.UploadId.Should().BeEmpty("秒传不需要 uploadId");
        result.Resume.Should().BeFalse();
        // 秒传命中不应发起 S3 multipart
        s3.Verify(x => x.CreateMultipartUploadAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()), Times.Never);
    }

    [Fact]
    public async Task Init_同哈希但大小不同_不命中秒传_走正常init()
    {
        // 缺陷3回归：Size 防碰撞。库里 1024，请求 2048，哈希相同也不应误判秒传。
        var (db, s3, user) = CreateDeps(nameof(Init_同哈希但大小不同_不命中秒传_走正常init));
        db.Files.Add(new FileMeta
        {
            Name = "a.bin", S3Key = "k1", S3Bucket = "files",
            Size = 1024, ContentType = "application/octet-stream",
            ContentHash = Sha, OwnerId = OwnerId,
        });
        await db.SaveChangesAsync();
        s3.Setup(x => x.CreateMultipartUploadAsync("files", "obj", default)).ReturnsAsync("uid-1");
        var handler = new InitMultipartCommandHandler(s3.Object, db, user.Object);

        var result = await handler.Handle(new InitMultipartCommand("files", "obj", Sha, TotalParts: 1, Size: 2048), CancellationToken.None);

        result.Instant.Should().BeFalse("大小不同不应命中秒传");
        result.UploadId.Should().Be("uid-1");
    }

    [Fact]
    public async Task Init_他人文件不命中秒传_所有权隔离()
    {
        var (db, s3, user) = CreateDeps(nameof(Init_他人文件不命中秒传_所有权隔离));
        db.Files.Add(new FileMeta
        {
            Name = "a.bin", S3Key = "k1", S3Bucket = "files",
            Size = 1024, ContentType = "application/octet-stream",
            ContentHash = Sha, OwnerId = "another-user",
        });
        await db.SaveChangesAsync();
        s3.Setup(x => x.CreateMultipartUploadAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>())).ReturnsAsync("uid-1");
        var handler = new InitMultipartCommandHandler(s3.Object, db, user.Object);

        var result = await handler.Handle(new InitMultipartCommand("files", "obj", Sha, TotalParts: 1, Size: 1024), CancellationToken.None);

        result.Instant.Should().BeFalse("他人文件不参与当前用户秒传");
    }

    [Fact]
    public async Task Complete_成功后落FileMeta_使后续分片秒传可命中()
    {
        // 缺陷2核心回归：分片完成必须落 FileMeta，否则同文件再次分片上传永远命中不了秒传。
        var (db, s3, user) = CreateDeps(nameof(Complete_成功后落FileMeta_使后续分片秒传可命中));
        // 预置一个 Active 会话（带 ContentHash）
        db.UploadSessions.Add(new MultipartUploadSession
        {
            BucketName = "files", ObjectKey = "obj-key", UploadId = "uid-1",
            ContentHash = Sha, OwnerId = OwnerId, Status = UploadSessionStatus.Active,
        });
        await db.SaveChangesAsync();

        var parts = new List<CompletedPartDto>
        {
            new(1, "etag-1"), new(2, "etag-2"),
        };
        var handler = new CompleteMultipartCommandHandler(s3.Object, db, user.Object);

        var result = await handler.Handle(new CompleteMultipartCommand("files", "obj-key", "uid-1", parts, FileName: "a.bin", Size: 1024), CancellationToken.None);

        result.Location.Should().Be("files/obj-key");
        // FileMeta 应被创建
        var meta = await db.Files.SingleOrDefaultAsync();
        meta.Should().NotBeNull("分片完成后应落 FileMeta 供秒传查重");
        meta!.ContentHash.Should().Be(Sha);
        meta.Size.Should().Be(1024);
        meta.Name.Should().Be("a.bin");
        meta.OwnerId.Should().Be(OwnerId);

        // 会话应标记为 Completed
        var session = await db.UploadSessions.SingleAsync();
        session.Status.Should().Be(UploadSessionStatus.Completed);

        // 串联验证：再次 init 同文件现在能命中秒传
        var initHandler = new InitMultipartCommandHandler(s3.Object, db, user.Object);
        var initResult = await initHandler.Handle(new InitMultipartCommand("files", "obj2", Sha, TotalParts: 2, Size: 1024), CancellationToken.None);
        initResult.Instant.Should().BeTrue("FileMeta 已落库，再次分片上传同文件应秒传");
    }
}