using McpSsh.Server;
using McpSsh.Server.Audit;
using McpSsh.Server.Sftp;
using McpSsh.Server.Ssh;
using Renci.SshNet;

namespace McpSsh.Tests;

public sealed class SftpServiceTests
{
    [Fact]
    public async Task PutAsync_ReturnsErrorWhenLocalFileIsOutsideWorkingDirectory()
    {
        var service = CreateService();

        var result = await service.PutAsync("host", "user", "/tmp/file.txt", "/tmp/file.txt", null, null, null, null, null, CancellationToken.None);

        Assert.Equal("unsafe_local_path", result.Error);
    }

    [Fact]
    public async Task PutAsync_ReturnsErrorWhenLocalFileIsMissing()
    {
        var service = CreateService();

        var result = await service.PutAsync("host", "user", "missing-file.txt", "/tmp/file.txt", null, null, null, null, null, CancellationToken.None);

        Assert.Equal("local_file_not_found", result.Error);
    }

    [Fact]
    public async Task GetAsync_ReturnsErrorWhenLocalFileExistsAndOverwriteIsFalse()
    {
        var path = Path.Combine("sftp-test-existing.txt");
        await File.WriteAllTextAsync(path, "existing");
        try
        {
            var service = CreateService();

            var result = await service.GetAsync("host", "user", "/tmp/file.txt", path, null, null, null, overwrite: false, maxBytes: null, CancellationToken.None);

            Assert.Equal("local_file_exists", result.Error);
        }
        finally
        {
            File.Delete(path);
        }
    }

    private static SftpService CreateService()
    {
        return new SftpService(new ThrowingClientFactory(), new CapturingAuditLogger(), new FixedClock());
    }

    private sealed class ThrowingClientFactory : ISshClientFactory
    {
        public SshClient CreateSshClient(SshConnectionRequest request) => throw new NotSupportedException();

        public SftpClient CreateSftpClient(SshConnectionRequest request) => throw new NotSupportedException();

        public ScpClient CreateScpClient(SshConnectionRequest request) => throw new NotSupportedException();
    }

    private sealed class CapturingAuditLogger : IAuditLogger
    {
        public void Log(AuditEvent auditEvent)
        {
        }
    }

    private sealed class FixedClock : ISystemClock
    {
        public DateTimeOffset UtcNow => DateTimeOffset.Parse("2026-05-24T12:00:00Z");
    }
}