using System.Diagnostics;

namespace Azaion.Missions.E2E.Fixtures;

/// <summary>
/// Collection-scoped fixture for scenarios that assert startup-time behavior
/// (migrator side-effects, JWKS bootstrap, env-var presence). Re-creates the
/// compose stack between scenarios via <c>docker compose down -v &amp;&amp; up -d</c>.
/// </summary>
/// <remarks>
/// The fixture only runs when <c>COMPOSE_RESTART_ENABLED=1</c> in the consumer
/// container. CI sets this; per-developer runs leave it unset to keep the
/// inner-loop fast. Tests that depend on the fixture must skip with a clear
/// reason when it is disabled.
/// </remarks>
public sealed class ComposeRestartFixture
{
    public bool Enabled => Environment.GetEnvironmentVariable("COMPOSE_RESTART_ENABLED") == "1";

    public string ComposeFile =>
        Environment.GetEnvironmentVariable("COMPOSE_FILE_PATH") ?? "/workspace/docker-compose.test.yml";

    public void RestartStack()
    {
        if (!Enabled)
            throw new InvalidOperationException(
                "ComposeRestartFixture is disabled; set COMPOSE_RESTART_ENABLED=1 to use it.");

        Run("docker", $"compose -f {ComposeFile} down -v");
        Run("docker", $"compose -f {ComposeFile} up -d postgres-test missions jwks-mock");
    }

    private static void Run(string file, string args)
    {
        var psi = new ProcessStartInfo(file, args)
        {
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false
        };
        using var p = Process.Start(psi)
            ?? throw new InvalidOperationException($"Failed to launch {file} {args}");
        p.WaitForExit();
        if (p.ExitCode != 0)
        {
            var err = p.StandardError.ReadToEnd();
            throw new InvalidOperationException($"`{file} {args}` exited {p.ExitCode}: {err}");
        }
    }
}