using System.Diagnostics;
using System.Globalization;

namespace Azaion.Missions.E2E.Helpers;

/// <summary>
/// Scrapes <c>docker logs</c> from inside the e2e-consumer container, used
/// to assert "unhandled exception" and structured log lines emitted by the
/// SUT (NFT-SEC-08 stack-not-leaked, NFT-RES-01..04 cascade/migrator log
/// invariants, NFT-RES-06 Npgsql 3D000).
/// </summary>
/// <remarks>
/// Like the docker-compose fixtures, this helper requires docker CLI access
/// (and typically a docker socket bind). Tests that depend on it must
/// <see cref="Xunit.Skip.IfNot(bool, string)"/> when the CLI is not
/// available — silent passing is rejected.
/// </remarks>
public static class DockerLogs
{
    public static bool Contains(string container, string needle, DateTime sinceUtc)
        => Read(container, sinceUtc).Contains(needle, StringComparison.Ordinal);

    /// <summary>Returns the combined stdout+stderr log slice since <paramref name="sinceUtc"/>.</summary>
    public static string Read(string container, DateTime? sinceUtc = null)
    {
        var args = sinceUtc is { } cutoff
            ? $"logs --since {cutoff.ToString("yyyy-MM-ddTHH:mm:ssZ", CultureInfo.InvariantCulture)} {container}"
            : $"logs {container}";
        var psi = new ProcessStartInfo("docker", args)
        {
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false
        };
        try
        {
            using var p = Process.Start(psi)
                ?? throw new InvalidOperationException("docker command not available");
            var stdout = p.StandardOutput.ReadToEnd();
            var stderr = p.StandardError.ReadToEnd();
            p.WaitForExit();
            return stdout + stderr;
        }
        catch (System.ComponentModel.Win32Exception)
        {
            // No docker CLI in PATH — surface, do not silently pass.
            throw new InvalidOperationException(
                $"docker CLI not available; cannot scrape logs for '{container}'. " +
                "Mount /var/run/docker.sock and install docker-cli in the e2e-consumer image.");
        }
    }
}