using Microsoft.Data.SqlClient;
using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Data;

/// <summary>
/// Schreibt Deployment-Lauf-Ergebnisse in die SQL-Datenbank.
/// Tabellen: dbo.DeploymentRuns (GUID-PK) + dbo.DeploymentTargetResults.
/// Ist kein ConnectionString konfiguriert, werden alle Operationen still übersprungen.
/// </summary>
public sealed class SqlRunLogger
{
    private readonly string? _connectionString;

    public SqlRunLogger(string? connectionString)
    {
        _connectionString = string.IsNullOrWhiteSpace(connectionString)
            ? null
            : connectionString;
    }

    public bool IsEnabled => _connectionString is not null;

    /// <summary>
    /// Legt einen neuen Lauf-Datensatz an.
    /// </summary>
    public async Task BeginRunAsync(
        Guid runId,
        DateTimeOffset startedAt,
        string certificateFilePath,
        string certificateFingerprint,
        CancellationToken cancellationToken = default)
    {
        if (_connectionString is null) return;

        const string sql = """
            INSERT INTO dbo.DeploymentRuns
                (Id, StartedAtUtc, SourceFile, SourceFingerprint, StartedBy, MachineName, OverallStatus)
            VALUES
                (@Id, @StartedAtUtc, @SourceFile, @SourceFingerprint, @StartedBy, @MachineName, N'Running');
            """;

        await using SqlConnection conn = new(_connectionString);
        await conn.OpenAsync(cancellationToken);
        await using SqlCommand cmd = new(sql, conn);

        cmd.Parameters.AddWithValue("@Id", runId);
        cmd.Parameters.AddWithValue("@StartedAtUtc", startedAt.UtcDateTime);
        cmd.Parameters.AddWithValue("@SourceFile", Path.GetFileName(certificateFilePath));
        cmd.Parameters.AddWithValue("@SourceFingerprint", certificateFingerprint);
        cmd.Parameters.AddWithValue("@StartedBy", Environment.UserName);
        cmd.Parameters.AddWithValue("@MachineName", Environment.MachineName);

        await cmd.ExecuteNonQueryAsync(cancellationToken);
    }

    /// <summary>
    /// Aktualisiert den Lauf-Datensatz mit Endzeitpunkt und Gesamtstatus.
    /// </summary>
    public async Task CompleteRunAsync(
        Guid runId,
        DateTimeOffset finishedAt,
        bool overallSuccess,
        int successCount,
        int totalCount,
        CancellationToken cancellationToken = default)
    {
        if (_connectionString is null) return;

        string status = overallSuccess
            ? "Success"
            : (successCount > 0 ? "PartialFailure" : "Failure");

        const string sql = """
            UPDATE dbo.DeploymentRuns
            SET FinishedAtUtc = @FinishedAtUtc,
                OverallStatus = @OverallStatus
            WHERE Id = @Id;
            """;

        await using SqlConnection conn = new(_connectionString);
        await conn.OpenAsync(cancellationToken);
        await using SqlCommand cmd = new(sql, conn);

        cmd.Parameters.AddWithValue("@Id", runId);
        cmd.Parameters.AddWithValue("@FinishedAtUtc", finishedAt.UtcDateTime);
        cmd.Parameters.AddWithValue("@OverallStatus", status);

        await cmd.ExecuteNonQueryAsync(cancellationToken);
    }

    /// <summary>
    /// Schreibt das Ergebnis eines einzelnen Deployment-Ziels.
    /// </summary>
    public async Task WriteTargetResultAsync(
        Guid runId,
        TargetStepResult step,
        CancellationToken cancellationToken = default)
    {
        if (_connectionString is null) return;

        string status = step.Success ? "Success" : "Failure";

        const string sql = """
            INSERT INTO dbo.DeploymentTargetResults
                (DeploymentRunId, TargetId, TargetName,
                 StartedAtUtc, FinishedAtUtc,
                 CopySucceeded, RestartSucceeded, TlsSucceeded,
                 ObservedFingerprint, Status, ErrorMessage)
            VALUES
                (@RunId, @TargetId, @TargetName,
                 @StartedAtUtc, @FinishedAtUtc,
                 @CopySucceeded, @RestartSucceeded, @TlsSucceeded,
                 @ObservedFingerprint, @Status, @ErrorMessage);
            """;

        await using SqlConnection conn = new(_connectionString);
        await conn.OpenAsync(cancellationToken);
        await using SqlCommand cmd = new(sql, conn);

        cmd.Parameters.AddWithValue("@RunId", runId);
        cmd.Parameters.AddWithValue("@TargetId", step.TargetId);
        cmd.Parameters.AddWithValue("@TargetName", step.TargetName);
        cmd.Parameters.AddWithValue("@StartedAtUtc", step.StartedAt.UtcDateTime);
        cmd.Parameters.AddWithValue("@FinishedAtUtc", step.FinishedAt.UtcDateTime);
        cmd.Parameters.AddWithValue("@CopySucceeded", step.CopySucceeded);
        cmd.Parameters.AddWithValue("@RestartSucceeded", step.RestartSucceeded);
        cmd.Parameters.AddWithValue("@TlsSucceeded", step.TlsSucceeded);
        cmd.Parameters.AddWithValue("@ObservedFingerprint", (object?)step.ObservedFingerprint ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@Status", status);
        cmd.Parameters.AddWithValue("@ErrorMessage", step.Success ? DBNull.Value : (object?)(step.Detail ?? step.StatusText));

        await cmd.ExecuteNonQueryAsync(cancellationToken);
    }

    /// <summary>
    /// Persistiert ein vollständiges <see cref="DeploymentRunResult"/> in einem einzigen Aufruf.
    /// </summary>
    public async Task PersistRunResultAsync(
        DeploymentRunResult runResult,
        CancellationToken cancellationToken = default)
    {
        if (_connectionString is null) return;

        await BeginRunAsync(
            runResult.RunId,
            runResult.StartedAt,
            runResult.CertificateFilePath,
            runResult.CertificateFingerprint,
            cancellationToken);

        foreach (TargetStepResult step in runResult.TargetResults)
        {
            await WriteTargetResultAsync(runResult.RunId, step, cancellationToken);
        }

        int successCount = runResult.TargetResults.Count(r => r.Success);

        await CompleteRunAsync(
            runResult.RunId,
            runResult.FinishedAt,
            runResult.OverallSuccess,
            successCount,
            runResult.TargetResults.Count,
            cancellationToken);
    }
}