using DigitalData.Modules.Database;
using EnvelopeGenerator.Service.Schedulers;
using Microsoft.Extensions.Options;

namespace EnvelopeGenerator.Service;

public sealed class Worker : BackgroundService
{
    private readonly ILogger<Worker> _logger;
    private readonly ServiceConfig _config;
    private readonly string _connectionString;
    private readonly TempFiles _tempFiles;
    private readonly SchedulerFinishEnvelope _schedulerFinishEnvelope;
    private readonly SchedulerEnvelopeTaskApi _schedulerEnvelopeTaskApi;

    public Worker(
        ILogger<Worker> logger,
        IOptions<ServiceConfig> config,
        IConfiguration configuration,
        TempFiles tempFiles,
        SchedulerFinishEnvelope schedulerFinishEnvelope,
        SchedulerEnvelopeTaskApi schedulerEnvelopeTaskApi)
    {
        _logger = logger;
        _config = config.Value;
        _connectionString = configuration.GetConnectionString("Default")
            ?? throw new InvalidOperationException("ConnectionStrings:Default is not configured.");
        _tempFiles = tempFiles;
        _schedulerFinishEnvelope = schedulerFinishEnvelope;
        _schedulerEnvelopeTaskApi = schedulerEnvelopeTaskApi;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        try
        {
            _logger.LogInformation("EnvelopeGenerator.Service starting...");

            // 1. Validate connection string
            if (string.IsNullOrWhiteSpace(_connectionString))
                throw new InvalidOperationException("Connection string is empty!");

            // 2. Build LogConfig (required by CommonServices jobs via JobDataMap)
            var logConfig = LogConfigFactory.Create(_config);
            _logger.LogInformation("DEBUG = {Debug}", _config.Debug);

            // 3. Connect to DB and load GDPicture license
            _logger.LogDebug("Initializing Database...");
            var database = new MSSQLServer(logConfig, _connectionString);

            if (!database.DBInitialized)
                throw new InvalidOperationException("Database connection could not be established!");

            _logger.LogDebug("Database initialized.");

            var licenseKey = database.GetScalarValue(
                "SELECT LICENSE FROM TBDD_3RD_PARTY_MODULES WHERE NAME = 'GDPICTURE' AND ACTIVE = 1") as string;

            if (string.IsNullOrWhiteSpace(licenseKey))
                throw new InvalidOperationException("GDPicture license could not be loaded!");

            _logger.LogDebug("GDPicture license loaded.");

            // 4. Create service-level temp directory
            _tempFiles.Create();

            // 5. Start FinalizeDocument scheduler
            _logger.LogDebug("Initializing schedulers...");
            await _schedulerFinishEnvelope.Start(licenseKey!, logConfig);

            // 6. Delay between schedulers (legacy behavior preserved)
            await Task.Delay(2500, stoppingToken);

            // 7. Start API envelope scheduler
            await _schedulerEnvelopeTaskApi.Start(logConfig);

            _logger.LogInformation("EnvelopeGenerator.Service started!");

            // 8. Wait for cancellation (service runs until stopped)
            await Task.Delay(Timeout.Infinite, stoppingToken);
        }
        catch (OperationCanceledException)
        {
            // Normal shutdown � not an error
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "EnvelopeGenerator.Service encountered a fatal error during startup.");
            throw;
        }
    }

    public override async Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("EnvelopeGenerator.Service stopping...");

        try
        {
            await _schedulerFinishEnvelope.Stop();
            await _schedulerEnvelopeTaskApi.Stop();
            _tempFiles.CleanUp();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error during service shutdown.");
        }

        await base.StopAsync(cancellationToken);
        _logger.LogInformation("EnvelopeGenerator.Service stopped!");
    }
}