using ConsoleApp2.Const;
using ConsoleApp2.HostedServices.Abstractions;
using ConsoleApp2.Options;
using ConsoleApp2.Services;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace ConsoleApp2.HostedServices;

/// <summary>
/// 数据处理服务，对导入后的数据进行处理
/// </summary>
public class TransformService : ITransformService
{
    private readonly ILogger _logger;
    private readonly IOptions<DataTransformOptions> _options;
    private readonly DataRecordQueue _producerQueue;
    private readonly DataRecordQueue _consumerQueue;
    private readonly ProcessContext _context;


    public TransformService(ILogger<TransformService> logger, 
        IOptions<DataTransformOptions> options,
        [FromKeyedServices(ProcessStep.Producer)]DataRecordQueue producerQueue,
        [FromKeyedServices(ProcessStep.Consumer)]DataRecordQueue consumerQueue, 
        ProcessContext context)
    {
        _logger = logger;
        _options = options;
        _producerQueue = producerQueue;
        _consumerQueue = consumerQueue;
        _context = context;
    }

    public async Task ExecuteAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("***** Data transform service started, thread id: {ThreadId} *****", Environment.CurrentManagedThreadId);
        while (!_context.IsInputCompleted || _producerQueue.Count > 0)
        {
            // var dbOptions = _options.Value.DatabaseFilter(record);
            if (!_producerQueue.TryDequeue(out var record)) continue;
            record.Database = _options.Value.DatabaseFilter?.Invoke(record);

            for (var i = 0; i < record.Fields.Length; i++)
            {
                var field = record[i];

                if (field == "\\N")
                {
                    field = "NULL";
                    goto Escape;
                }
                // else if(DumpDataHelper.CheckHexField(field))
                //     field = $"0x{field}";

                switch (_options.Value.GetColumnType(record.TableName, record.Headers[i]))
                {
                    case ColumnType.Blob or ColumnType.Text:
                        field = string.IsNullOrEmpty(field) ? "''" : $"0x{field}";
                        break;
                    default:
                        break;
                }

                Escape:
                record[i] = field;
            }
            
            // TODO: 数据处理/过滤/复制
            
            _consumerQueue.Enqueue(record);
            _context.AddTransform();
        }

        _context.CompleteTransform();
        _logger.LogInformation("***** Data transformation service completed *****");
    }
}