using ConsoleApp2.Entities;
using ConsoleApp2.Helpers;
using ConsoleApp2.Services;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace ConsoleApp2.HostedServices;

public class SqlFileOutputService : BackgroundService
{
    private readonly string _outputFile = "D:/DumpOutput/cferp_test_1.sql"; //
    private readonly DataRecordQueue _consumerQueue;
    private readonly ILogger _logger;
    private readonly ProcessContext _context;

    public SqlFileOutputService(
        ILogger<SqlFileOutputService> logger,
        [FromKeyedServices(ProcessStep.Consumer)]
        DataRecordQueue consumerQueue,
        ProcessContext context)
    {
        _logger = logger;
        _consumerQueue = consumerQueue;
        _context = context;
    }


    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("***** Sql file output service started, thread id: {ThreadId} *****", Environment.CurrentManagedThreadId);
        var count = 0;
        var tableRecords = new Dictionary<string, IList<DataRecord>>();
        while (!_context.IsTransformCompleted || _consumerQueue.Count > 0)
        {
            if (!_consumerQueue.TryDequeue(out var record)) continue;

            tableRecords.AddOrUpdate(record.TableName, [record], (key, value) =>
            {
                value.Add(record);
                return value;
            });

            ++count;

            if (count >= 200)
            {
                await File.AppendAllTextAsync(_outputFile,
                    MySqlDestination.SerializeRecords(tableRecords), stoppingToken);
                tableRecords.Clear();
                _context.AddOutput(count);
                count = 0;
            }
        }
        await File.AppendAllTextAsync(_outputFile,
            MySqlDestination.SerializeRecords(tableRecords), stoppingToken);
        tableRecords.Clear();
        _context.AddOutput(count);
        _context.CompleteOutput();
        
        _logger.LogInformation("***** Sql file output service completed *****");
    }
   
}