using ConsoleApp2.HostedServices.Abstractions;
using ConsoleApp2.Options;
using ConsoleApp2.Services;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
namespace ConsoleApp2.HostedServices;

/// <summary>
/// 数据导出服务，将数据导出至MySql服务
/// </summary>
public class OutputService : IOutputService
{
    private readonly ILogger _logger;
    private readonly IOptions<DatabaseOutputOptions> _outputOptions;
    private readonly IOptions<DataTransformOptions> _transformOptions;
    private readonly ProcessContext _context;
    private readonly TaskManager _taskManager;
    private readonly ErrorRecorder _errorRecorder;

    public OutputService(ILogger<OutputService> logger,
        IOptions<DatabaseOutputOptions> outputOptions,
        ProcessContext context,
        TaskManager taskManager, 
        IOptions<DataTransformOptions> transformOptions, 
        ErrorRecorder errorRecorder)
    {
        _logger = logger;
        _outputOptions = outputOptions;
        _context = context;
        _taskManager = taskManager;
        _transformOptions = transformOptions;
        _errorRecorder = errorRecorder;
    }
    private int _runingTaskCount;
    public int RuningTaskCount
    {
        get => _runingTaskCount;
    }
    public void DoTask() => Interlocked.Increment(ref _runingTaskCount);
    public void FinishTask() => Interlocked.Decrement(ref _runingTaskCount);
    public void ExecuteAsync(TasksOptions tasksOptions, DataRecordQueue consumerQueue, ProcessContext context, CancellationToken cancellationToken)
    {
        if (context.IsTransformCompleted == false && consumerQueue.Count < tasksOptions.OutPutOptions.FlushCount) return;
        if (RuningTaskCount >= tasksOptions.OutPutOptions.OutPutTaskCount ) return;
        var records = new List<DataRecord>();

        for (int i = 0; i < tasksOptions.OutPutOptions.FlushCount; i++)
        {
            if (consumerQueue.TryDequeue(out var record)) records.Add(record);
            else break;
        }
        if (records.Count > 0)
        {
            ThreadPool.QueueUserWorkItem(async (queueState) =>
            {
                DoTask();
                await FlushAsync(records);
                FinishTask();
            });
        }
    }

    private async Task FlushAsync(IEnumerable<DataRecord> records)
    {
        var count = 0;
        await using var output = new MySqlDestination(
            _outputOptions.Value.ConnectionString ?? throw new InvalidOperationException("Connection string is required"),
            _logger, _context, _transformOptions, _errorRecorder);
        //if (records == null || records.Count() == 0) return;
        //var dbName = $"cferp_test_1";
        //if (records != null && records.Count() > 0)
        //{
        //    dbName = $"cferp_test_{records.FirstOrDefault()?.CompanyID}";
        //}

        //await  using var output = new MySqlDestination(new MySqlConnectionStringBuilder
        //{
        //    Server = "127.0.0.1",
        //    Port = 34309,
        //    Database = dbName,
        //    UserID = "root",
        //    Password = "123456",
        //    MaximumPoolSize = 50,
        //}.ConnectionString, _logger,true);
        foreach (var record in records)
        {
            await output.WriteRecordAsync(record);
            count++;
        }
        await output.FlushAsync(_outputOptions.Value.MaxAllowedPacket);
        _context.AddOutput(count);
    }
}