using Xunit;
using Npgsql;
using Testcontainers.PostgreSql;

namespace Kbx.Tests.Scenarios;

/// <summary>
/// Host repository reference fixture. Requires Testcontainers.PostgreSql and Npgsql.
/// The container is disposable; never point this fixture at a production connection string.
/// </summary>
public sealed class KbxScenarioPostgresFixture : IAsyncLifetime
{
    private readonly PostgreSqlContainer _postgres = new PostgreSqlBuilder()
        .WithImage("postgres:17-alpine")
        .WithDatabase("kbx_scenario_test")
        .WithUsername("kbx")
        .WithPassword("kbx-test-only")
        .Build();

    public string ConnectionString => _postgres.GetConnectionString();

    public async Task InitializeAsync()
    {
        await _postgres.StartAsync();
        // Host: run DbUp migrations in filename order, then bootstrap/reset/seed SQL.
    }

    public Task DisposeAsync() => _postgres.DisposeAsync().AsTask();

    public static async Task AssertTestGuardAsync(string connectionString, CancellationToken ct = default)
    {
        await using var connection = new NpgsqlConnection(connectionString);
        await connection.OpenAsync(ct);
        await using var command = new NpgsqlCommand(
            "select exists(select 1 from kbx_test.environment_guard where marker='KBX_SCENARIO_TEST_ONLY')", connection);
        if (await command.ExecuteScalarAsync(ct) is not true)
            throw new InvalidOperationException("KBX scenario database guard is missing.");
    }
}