using Health.Application.Users;
using Health.Domain.Entities;
using Health.Infrastructure.Users;

namespace Health.Tests;

public sealed class AccountDeletionTests
{
    [Fact]
    public async Task LocalCleanup_DeletesOwnedUploadsWithoutTouchingOtherFiles()
    {
        var root = Path.Combine(Path.GetTempPath(), $"health-account-delete-{Guid.NewGuid():N}");
        var userId = Guid.NewGuid();
        var userDirectory = Path.Combine(root, "users", userId.ToString("N"));
        var reportPath = Path.Combine(root, "reports", "owned-report.pdf");
        var chatFileName = $"{Guid.NewGuid()}.jpg";
        var chatImagePath = Path.Combine(userDirectory, chatFileName);
        var otherUserId = Guid.NewGuid();
        var otherUserPath = Path.Combine(root, "users", otherUserId.ToString("N"), "keep.jpg");
        var outsidePath = Path.Combine(Path.GetDirectoryName(root)!, "outside-account-file.txt");

        try
        {
            Directory.CreateDirectory(userDirectory);
            Directory.CreateDirectory(Path.GetDirectoryName(reportPath)!);
            Directory.CreateDirectory(Path.GetDirectoryName(otherUserPath)!);
            await File.WriteAllTextAsync(Path.Combine(userDirectory, "unlinked-upload.jpg"), "owned");
            await File.WriteAllTextAsync(reportPath, "owned");
            await File.WriteAllTextAsync(chatImagePath, "owned");
            await File.WriteAllTextAsync(otherUserPath, "other");
            await File.WriteAllTextAsync(outsidePath, "outside");

            var cleanup = new LocalAccountFileCleanup(root);
            var references = new AccountFileReferences(
                ["/uploads/reports/owned-report.pdf", "/uploads/../outside-account-file.txt"],
                [$"{{\"imageUrl\":\"/uploads/users/{userId:N}/{chatFileName}\"}}", $"{{\"imageUrl\":\"/uploads/users/{otherUserId:N}/keep.jpg\"}}"]);

            await cleanup.DeleteAsync(userId, references, CancellationToken.None);

            Assert.False(Directory.Exists(userDirectory));
            Assert.False(File.Exists(reportPath));
            Assert.False(File.Exists(chatImagePath));
            Assert.True(File.Exists(otherUserPath));
            Assert.True(File.Exists(outsidePath));
        }
        finally
        {
            if (Directory.Exists(root)) Directory.Delete(root, recursive: true);
            if (File.Exists(outsidePath)) File.Delete(outsidePath);
        }
    }

    [Fact]
    public async Task UserService_CleansFilesBeforeDeletingDatabaseData()
    {
        var calls = new List<string>();
        var references = new AccountFileReferences(["/uploads/reports/report.pdf"], []);
        var repository = new FakeUserRepository(references, calls);
        var cleanup = new FakeAccountFileCleanup(calls);
        var service = new UserService(repository, cleanup);

        await service.DeleteAccountAsync(Guid.NewGuid(), CancellationToken.None);

        Assert.Equal(["references", "files", "database"], calls);
        Assert.Same(references, cleanup.ReceivedReferences);
    }

    [Fact]
    public async Task UserService_DoesNotDeleteDatabaseWhenFileCleanupFails()
    {
        var calls = new List<string>();
        var repository = new FakeUserRepository(new AccountFileReferences([], []), calls);
        var service = new UserService(repository, new FailingAccountFileCleanup(calls));

        await Assert.ThrowsAsync<IOException>(() =>
            service.DeleteAccountAsync(Guid.NewGuid(), CancellationToken.None));

        Assert.Equal(["references", "files"], calls);
    }

    private sealed class FakeUserRepository(
        AccountFileReferences references,
        List<string> calls) : IUserRepository
    {
        public Task<User?> GetAsync(Guid userId, CancellationToken ct) => Task.FromResult<User?>(null);

        public Task<AccountFileReferences> GetAccountFileReferencesAsync(Guid userId, CancellationToken ct)
        {
            calls.Add("references");
            return Task.FromResult(references);
        }

        public Task SaveChangesAsync(CancellationToken ct) => Task.CompletedTask;

        public Task DeleteAccountDataAsync(Guid userId, CancellationToken ct)
        {
            calls.Add("database");
            return Task.CompletedTask;
        }
    }

    private sealed class FakeAccountFileCleanup(List<string> calls) : IAccountFileCleanup
    {
        public AccountFileReferences? ReceivedReferences { get; private set; }

        public Task DeleteAsync(Guid userId, AccountFileReferences references, CancellationToken ct)
        {
            calls.Add("files");
            ReceivedReferences = references;
            return Task.CompletedTask;
        }
    }

    private sealed class FailingAccountFileCleanup(List<string> calls) : IAccountFileCleanup
    {
        public Task DeleteAsync(Guid userId, AccountFileReferences references, CancellationToken ct)
        {
            calls.Add("files");
            throw new IOException("file is locked");
        }
    }
}