// -----------------------------------------------------------------------------
// PostgresOnlyStartupTests.cs
// Sprint: SPRINT_5100_0001_0001_mongodb_cli_cleanup_consolidation
// Task: T1.13 - PostgreSQL-only Platform Startup Test
// Description: Validates platform can start with PostgreSQL-only infrastructure.
// -----------------------------------------------------------------------------

using System.Reflection;
using StellaOps.Infrastructure.Postgres.Testing;
using Testcontainers.PostgreSql;

namespace StellaOps.Integration.Platform;

/// <summary>
/// Integration tests validating PostgreSQL-only platform startup.
/// </summary>
/// <remarks>
/// T1.13-AC1: Platform starts successfully with PostgreSQL only
/// T1.13-AC2: All services connect to PostgreSQL correctly
/// T1.13-AC3: Schema migrations run successfully
/// T1.13-AC4: No MongoDB connection attempts in logs
/// </remarks>
[Trait("Category", "Integration")]
[Trait("Category", "Platform")]
[Trait("Category", "PostgresOnly")]
public class PostgresOnlyStartupTests : IAsyncLifetime
{
    private PostgreSqlContainer? _container;
    private string? _connectionString;

    public async Task InitializeAsync()
    {
        _container = new PostgreSqlBuilder()
            .WithImage("postgres:16-alpine")
            .Build();

        await _container.StartAsync();
        _connectionString = _container.GetConnectionString();
    }

    public async Task DisposeAsync()
    {
        if (_container != null)
        {
            await _container.DisposeAsync();
        }
    }

    #region T1.13-AC1: Platform starts successfully with PostgreSQL only

    [Fact(DisplayName = "T1.13-AC1.1: PostgreSQL container starts and accepts connections")]
    public async Task PostgresContainer_StartsAndAcceptsConnections()
    {
        // Arrange & Act - already done in InitializeAsync

        // Assert
        _connectionString.Should().NotBeNullOrEmpty();
        _container!.State.Should().Be(DotNet.Testcontainers.Containers.TestcontainersStates.Running);

        // Verify connection works
        using var connection = new Npgsql.NpgsqlConnection(_connectionString);
        await connection.OpenAsync();
        connection.State.Should().Be(System.Data.ConnectionState.Open);
    }

    [Fact(DisplayName = "T1.13-AC1.2: PostgreSQL connection string contains no MongoDB references")]
    public void ConnectionString_ContainsNoMongoDbReferences()
    {
        // Assert
        _connectionString.Should().NotContainAny("mongo", "mongodb", "27017");
    }

    #endregion

    #region T1.13-AC2: Services connect to PostgreSQL correctly

    [Fact(DisplayName = "T1.13-AC2.1: Can create and verify database schema")]
    public async Task Database_CanCreateAndVerifySchema()
    {
        // Arrange
        using var connection = new Npgsql.NpgsqlConnection(_connectionString);
        await connection.OpenAsync();

        // Act - Create a test schema
        using var createCmd = connection.CreateCommand();
        createCmd.CommandText = "CREATE SCHEMA IF NOT EXISTS test_platform";
        await createCmd.ExecuteNonQueryAsync();

        // Assert - Verify schema exists
        using var verifyCmd = connection.CreateCommand();
        verifyCmd.CommandText = @"
            SELECT schema_name
            FROM information_schema.schemata
            WHERE schema_name = 'test_platform'";
        var result = await verifyCmd.ExecuteScalarAsync();
        result.Should().Be("test_platform");
    }

    [Fact(DisplayName = "T1.13-AC2.2: Can perform basic CRUD operations")]
    public async Task Database_CanPerformCrudOperations()
    {
        // Arrange
        using var connection = new Npgsql.NpgsqlConnection(_connectionString);
        await connection.OpenAsync();

        // Create test table
        using var createCmd = connection.CreateCommand();
        createCmd.CommandText = @"
            CREATE TABLE IF NOT EXISTS test_crud (
                id SERIAL PRIMARY KEY,
                name VARCHAR(100) NOT NULL,
                created_at TIMESTAMPTZ DEFAULT NOW()
            )";
        await createCmd.ExecuteNonQueryAsync();

        // Act - Insert
        using var insertCmd = connection.CreateCommand();
        insertCmd.CommandText = "INSERT INTO test_crud (name) VALUES ('test-record') RETURNING id";
        var insertedId = await insertCmd.ExecuteScalarAsync();
        insertedId.Should().NotBeNull();

        // Act - Select
        using var selectCmd = connection.CreateCommand();
        selectCmd.CommandText = "SELECT name FROM test_crud WHERE id = @id";
        selectCmd.Parameters.AddWithValue("id", insertedId!);
        var name = await selectCmd.ExecuteScalarAsync();
        name.Should().Be("test-record");

        // Act - Update
        using var updateCmd = connection.CreateCommand();
        updateCmd.CommandText = "UPDATE test_crud SET name = 'updated-record' WHERE id = @id";
        updateCmd.Parameters.AddWithValue("id", insertedId!);
        var rowsAffected = await updateCmd.ExecuteNonQueryAsync();
        rowsAffected.Should().Be(1);

        // Act - Delete
        using var deleteCmd = connection.CreateCommand();
        deleteCmd.CommandText = "DELETE FROM test_crud WHERE id = @id";
        deleteCmd.Parameters.AddWithValue("id", insertedId!);
        rowsAffected = await deleteCmd.ExecuteNonQueryAsync();
        rowsAffected.Should().Be(1);
    }

    #endregion

    #region T1.13-AC3: Schema migrations run successfully

    [Fact(DisplayName = "T1.13-AC3.1: Can run DDL migrations")]
    public async Task Database_CanRunDdlMigrations()
    {
        // Arrange
        using var connection = new Npgsql.NpgsqlConnection(_connectionString);
        await connection.OpenAsync();

        // Act - Run a migration-like DDL script
        var migrationScript = @"
            -- V1: Create migrations tracking table
            CREATE TABLE IF NOT EXISTS schema_migrations (
                version VARCHAR(50) PRIMARY KEY,
                applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
                checksum VARCHAR(64) NOT NULL
            );

            -- V2: Create sample domain table
            CREATE TABLE IF NOT EXISTS scan_results (
                id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
                image_ref TEXT NOT NULL,
                findings_count INT NOT NULL DEFAULT 0,
                created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
            );

            -- Record migration
            INSERT INTO schema_migrations (version, checksum)
            VALUES ('V2_create_scan_results', 'abc123')
            ON CONFLICT (version) DO NOTHING;
        ";

        using var migrateCmd = connection.CreateCommand();
        migrateCmd.CommandText = migrationScript;
        await migrateCmd.ExecuteNonQueryAsync();

        // Assert - Verify migration recorded
        using var verifyCmd = connection.CreateCommand();
        verifyCmd.CommandText = "SELECT COUNT(*) FROM schema_migrations WHERE version = 'V2_create_scan_results'";
        var count = await verifyCmd.ExecuteScalarAsync();
        Convert.ToInt32(count).Should().Be(1);
    }

    [Fact(DisplayName = "T1.13-AC3.2: PostgreSQL extensions can be created")]
    public async Task Database_CanCreateExtensions()
    {
        // Arrange
        using var connection = new Npgsql.NpgsqlConnection(_connectionString);
        await connection.OpenAsync();

        // Act - Create common extensions used by StellaOps
        using var extCmd = connection.CreateCommand();
        extCmd.CommandText = "CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\"";
        await extCmd.ExecuteNonQueryAsync();

        // Assert - Verify extension exists
        using var verifyCmd = connection.CreateCommand();
        verifyCmd.CommandText = "SELECT COUNT(*) FROM pg_extension WHERE extname = 'uuid-ossp'";
        var count = await verifyCmd.ExecuteScalarAsync();
        Convert.ToInt32(count).Should().Be(1);
    }

    #endregion

    #region T1.13-AC4: No MongoDB connection attempts

    [Fact(DisplayName = "T1.13-AC4.1: Environment variables contain no MongoDB references")]
    public void EnvironmentVariables_ContainNoMongoDbReferences()
    {
        // Arrange - Get all environment variables
        var envVars = Environment.GetEnvironmentVariables();

        // Act & Assert
        foreach (string key in envVars.Keys)
        {
            var value = envVars[key]?.ToString() ?? "";

            // Skip if this is our test connection string
            if (key.Contains("POSTGRES", StringComparison.OrdinalIgnoreCase))
                continue;

            key.Should().NotContainEquivalentOf("mongo",
                $"Environment variable key '{key}' should not reference MongoDB");
        }
    }

    [Fact(DisplayName = "T1.13-AC4.2: PostgreSQL-only configuration is valid")]
    public void Configuration_IsPostgresOnly()
    {
        // This test documents the expected configuration pattern
        var expectedConfig = new Dictionary<string, string>
        {
            ["STELLAOPS_STORAGE_DRIVER"] = "postgres",
            ["STELLAOPS_CACHE_DRIVER"] = "valkey",  // or "redis" for compatibility
        };

        // Assert - Document the expected pattern
        expectedConfig["STELLAOPS_STORAGE_DRIVER"].Should().NotBe("mongodb");
        expectedConfig["STELLAOPS_STORAGE_DRIVER"].Should().Be("postgres");
    }

    #endregion
}