using Microsoft.Extensions.Logging.Abstractions;
using ZB.MOM.WW.ScadaBridge.SiteRuntime.Persistence;
using ZB.MOM.WW.ScadaBridge.TestSupport;

namespace ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests.Persistence;

/// <summary>
/// WP-33: Local Artifact Storage tests — shared scripts, external systems,
/// database connections, notification lists.
/// </summary>
/// <remarks>
/// Backed by a real temp-file LocalDb: <see cref="SiteStorageService"/> takes an
/// <c>ILocalDb</c> rather than a connection string, and LocalDb has no in-memory mode.
/// </remarks>
public class ArtifactStorageTests : IAsyncLifetime, IDisposable
{
    private readonly TestLocalDb _localDb;
    private SiteStorageService _storage = null!;

    public ArtifactStorageTests()
    {
        _localDb = TestLocalDb.CreateTemp("artifact-test");
    }

    public async Task InitializeAsync()
    {
        _storage = new SiteStorageService(
            _localDb.Db,
            NullLogger<SiteStorageService>.Instance);
        await _storage.InitializeAsync();
    }

    public Task DisposeAsync() => Task.CompletedTask;

    public void Dispose()
    {
        // Dispose first — the master connection anchors the WAL, so the sidecars
        // cannot be removed while it is open.
        var path = _localDb.Path;
        _localDb.Dispose();
        TestLocalDb.DeleteFiles(path);
    }

    // ── Shared Script Storage ──

    [Fact]
    public async Task StoreSharedScript_RoundTrips()
    {
        await _storage.StoreSharedScriptAsync("CalcAvg", "return 42;", "{}", "int");

        var scripts = await _storage.GetAllSharedScriptsAsync();
        Assert.Single(scripts);
        Assert.Equal("CalcAvg", scripts[0].Name);
        Assert.Equal("return 42;", scripts[0].Code);
        Assert.Equal("{}", scripts[0].ParameterDefinitions);
        Assert.Equal("int", scripts[0].ReturnDefinition);
    }

    [Fact]
    public async Task StoreSharedScript_Upserts_OnConflict()
    {
        await _storage.StoreSharedScriptAsync("CalcAvg", "return 1;", null, null);
        await _storage.StoreSharedScriptAsync("CalcAvg", "return 2;", "{\"x\":\"int\"}", "int");

        var scripts = await _storage.GetAllSharedScriptsAsync();
        Assert.Single(scripts);
        Assert.Equal("return 2;", scripts[0].Code);
        Assert.Equal("{\"x\":\"int\"}", scripts[0].ParameterDefinitions);
    }

    [Fact]
    public async Task StoreSharedScript_MultipleScripts()
    {
        await _storage.StoreSharedScriptAsync("Script1", "1", null, null);
        await _storage.StoreSharedScriptAsync("Script2", "2", null, null);
        await _storage.StoreSharedScriptAsync("Script3", "3", null, null);

        var scripts = await _storage.GetAllSharedScriptsAsync();
        Assert.Equal(3, scripts.Count);
    }

    [Fact]
    public async Task StoreSharedScript_NullableFields()
    {
        await _storage.StoreSharedScriptAsync("Simple", "42", null, null);

        var scripts = await _storage.GetAllSharedScriptsAsync();
        Assert.Single(scripts);
        Assert.Null(scripts[0].ParameterDefinitions);
        Assert.Null(scripts[0].ReturnDefinition);
    }

    // ── External System Storage ──

    [Fact]
    public async Task StoreExternalSystem_DoesNotThrow()
    {
        await _storage.StoreExternalSystemAsync(
            "WeatherAPI", "https://api.weather.com",
            "ApiKey", "{\"key\":\"abc\"}", "{\"getForecast\":{}}");

        // No exception = success. Query verification would need a Get method.
    }

    [Fact]
    public async Task StoreExternalSystem_Upserts()
    {
        await _storage.StoreExternalSystemAsync("API1", "https://v1", "Basic", null, null);
        await _storage.StoreExternalSystemAsync("API1", "https://v2", "ApiKey", "{}", null);

        // Upsert should not throw
    }

    // ── Database Connection Storage ──

    [Fact]
    public async Task StoreDatabaseConnection_DoesNotThrow()
    {
        await _storage.StoreDatabaseConnectionAsync(
            "MainDB", "Server=localhost;Database=main", 3, TimeSpan.FromSeconds(1));
    }

    [Fact]
    public async Task StoreDatabaseConnection_Upserts()
    {
        await _storage.StoreDatabaseConnectionAsync(
            "DB1", "Server=old", 3, TimeSpan.FromSeconds(1));
        await _storage.StoreDatabaseConnectionAsync(
            "DB1", "Server=new", 5, TimeSpan.FromSeconds(2));

        // Upsert should not throw
    }

    // ── Artifact set reconciliation ──
    //
    // Central always ships the COMPLETE system-wide set of each artifact class, so a
    // stored row absent from the incoming set was deleted centrally. The store methods
    // are upsert-only; without these deletes a centrally-deleted external system (or
    // shared script / DB connection / data connection) stayed orphaned on the site
    // forever and remained callable from site scripts.

    [Fact]
    public async Task DeleteSharedScriptsExcept_RemovesOrphans_KeepsPresent()
    {
        await _storage.StoreSharedScriptAsync("Keep1", "1", null, null);
        await _storage.StoreSharedScriptAsync("Keep2", "2", null, null);
        await _storage.StoreSharedScriptAsync("Orphan", "3", null, null);

        var removed = await _storage.DeleteSharedScriptsExceptAsync(["Keep1", "Keep2"]);

        Assert.Equal(["Orphan"], removed);
        var names = (await _storage.GetAllSharedScriptsAsync()).Select(s => s.Name).Order().ToList();
        Assert.Equal(["Keep1", "Keep2"], names);
    }

    [Fact]
    public async Task DeleteExternalSystemsExcept_RemovesOrphans_KeepsPresent()
    {
        await _storage.StoreExternalSystemAsync("MES", "https://mes", "ApiKey", null, null);
        await _storage.StoreExternalSystemAsync("Deleted", "https://old", "Basic", null, null);

        var removed = await _storage.DeleteExternalSystemsExceptAsync(["MES"]);

        Assert.Equal(["Deleted"], removed);
        Assert.Equal(["MES"], await TableNamesAsync("external_systems"));
    }

    [Fact]
    public async Task DeleteDatabaseConnectionsExcept_EmptyKeepSet_DeletesAll()
    {
        await _storage.StoreDatabaseConnectionAsync("DB1", "Server=a", 3, TimeSpan.FromSeconds(1));
        await _storage.StoreDatabaseConnectionAsync("DB2", "Server=b", 3, TimeSpan.FromSeconds(1));

        // An empty full set is legitimate: central saying no DB connections exist anymore.
        var removed = await _storage.DeleteDatabaseConnectionsExceptAsync([]);

        Assert.Equal(["DB1", "DB2"], removed.Order().ToList());
        Assert.Empty(await TableNamesAsync("database_connections"));
    }

    [Fact]
    public async Task DeleteDataConnectionDefinitionsExcept_RemovesOrphans_KeepsPresent()
    {
        await _storage.StoreDataConnectionDefinitionAsync("PlcA", "OpcUa", "{}");
        await _storage.StoreDataConnectionDefinitionAsync("Gone", "OpcUa", "{}");

        var removed = await _storage.DeleteDataConnectionDefinitionsExceptAsync(["PlcA"]);

        Assert.Equal(["Gone"], removed);
        var names = (await _storage.GetAllDataConnectionDefinitionsAsync()).Select(d => d.Name).ToList();
        Assert.Equal(["PlcA"], names);
    }

    [Fact]
    public async Task DeleteRowsExcept_NoOrphans_ReturnsEmpty_AndIsIdempotent()
    {
        await _storage.StoreExternalSystemAsync("MES", "https://mes", "ApiKey", null, null);

        Assert.Empty(await _storage.DeleteExternalSystemsExceptAsync(["MES"]));
        Assert.Empty(await _storage.DeleteExternalSystemsExceptAsync(["MES"]));
        Assert.Equal(["MES"], await TableNamesAsync("external_systems"));
    }

    private async Task<List<string>> TableNamesAsync(string table)
    {
        await using var connection = _storage.CreateConnection();
        await using var command = connection.CreateCommand();
        command.CommandText = $"SELECT name FROM {table} ORDER BY name";
        var names = new List<string>();
        await using var reader = await command.ExecuteReaderAsync();
        while (await reader.ReadAsync())
            names.Add(reader.GetString(0));
        return names;
    }

    // ── DeploymentManager-025 / SiteRuntime-031: central-only notif/SMTP purge ──
    //
    // Notification config is central-only. The site-side write paths and
    // SiteNotificationRepository were removed 2026-07-10 (arch-review 08 §1.3/#23);
    // PurgeCentralOnlyNotificationConfigAsync is retained as the security cleanup for
    // DBs written by older builds. These tests seed the (still-present) tables via raw
    // SQL — the only way rows can now exist — and assert the purge empties them.

    private async Task SeedNotificationRowAsync(string name, string emailsJson)
    {
        // Seeded through the service's own (already-open) LocalDb connection — a raw
        // SqliteConnection would lack the pragmas and the zb_hlc_next() UDF the site
        // tables' capture triggers call.
        await using var connection = _storage.CreateConnection();
        await using var command = connection.CreateCommand();
        command.CommandText =
            "INSERT INTO notification_lists (name, recipient_emails, updated_at) VALUES (@n, @e, @u)";
        command.Parameters.AddWithValue("@n", name);
        command.Parameters.AddWithValue("@e", emailsJson);
        command.Parameters.AddWithValue("@u", DateTimeOffset.UtcNow.ToString("O"));
        await command.ExecuteNonQueryAsync();
    }

    private async Task SeedSmtpRowAsync(string name, string password)
    {
        await using var connection = _storage.CreateConnection();
        await using var command = connection.CreateCommand();
        command.CommandText =
            @"INSERT INTO smtp_configurations (name, server, port, auth_mode, from_address, username, password, oauth_config, updated_at)
              VALUES (@n, 'smtp.example.com', 587, 'BasicAuth', 'noreply@example.com', 'smtpuser', @p, NULL, @u)";
        command.Parameters.AddWithValue("@n", name);
        command.Parameters.AddWithValue("@p", password);
        command.Parameters.AddWithValue("@u", DateTimeOffset.UtcNow.ToString("O"));
        await command.ExecuteNonQueryAsync();
    }

    private async Task<long> RowCountAsync(string table)
    {
        await using var connection = _storage.CreateConnection();
        await using var command = connection.CreateCommand();
        command.CommandText = $"SELECT COUNT(*) FROM {table}";
        return (long)(await command.ExecuteScalarAsync())!;
    }

    [Fact]
    public async Task PurgeCentralOnlyNotificationConfig_RemovesPersistedNotificationListsAndSmtpRows()
    {
        // Simulate a pre-fix build that already shipped a notification list and an
        // SMTP config (with a plaintext password) to the site.
        await SeedNotificationRowAsync("Ops Team", "[\"ops@example.com\"]");
        await SeedSmtpRowAsync("smtp.example.com:587", "PLAINTEXT-SECRET");

        Assert.Equal(1, await RowCountAsync("notification_lists"));
        Assert.Equal(1, await RowCountAsync("smtp_configurations"));

        // The fix: every artifact apply/deploy purges these central-only rows.
        await _storage.PurgeCentralOnlyNotificationConfigAsync();

        // Both tables are now empty — the plaintext SMTP credential is gone.
        Assert.Equal(0, await RowCountAsync("notification_lists"));
        Assert.Equal(0, await RowCountAsync("smtp_configurations"));
    }

    [Fact]
    public async Task PurgeCentralOnlyNotificationConfig_IsIdempotent_OnEmptyTables()
    {
        // No rows present — purge must not throw and must leave the tables empty.
        await _storage.PurgeCentralOnlyNotificationConfigAsync();
        await _storage.PurgeCentralOnlyNotificationConfigAsync();

        Assert.Equal(0, await RowCountAsync("notification_lists"));
        Assert.Equal(0, await RowCountAsync("smtp_configurations"));
    }

    // ── Schema includes all WP-33 tables ──

    [Fact]
    public async Task Initialize_CreatesAllArtifactTables()
    {
        // The initialize already ran. Verify by storing to each table.
        await _storage.StoreSharedScriptAsync("s", "code", null, null);
        await _storage.StoreExternalSystemAsync("e", "url", "None", null, null);
        await _storage.StoreDatabaseConnectionAsync("d", "connstr", 1, TimeSpan.Zero);

        // notification_lists / smtp_configurations remain in the schema (kept for the
        // security purge) — their presence is exercised by the purge tests above.

        // All succeeded without exceptions = tables exist
    }
}