using ConsoleApp2.Helpers;
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;
    }

    public async Task ExecuteAsync(TasksOptions tasksOptions, DataRecordQueue consumerQueue, ProcessContext context, CancellationToken cancellationToken)
    {
        _logger.LogInformation("***** Mysql output service started *****");
        _taskManager.CreateTasks(async () =>
        {
            //k: database v: records，按照要导出的数据库名分组
            var databaseDict = new Dictionary<string, List<DataRecord>>();
            while (!context.IsTransformCompleted || consumerQueue.Count > 0)
            {
                if (!consumerQueue.TryDequeue(out var record)) continue;
                var dbName = record.Database;
                var records = databaseDict.AddOrUpdate(dbName, [record], (_, list) =>
                {
                    list.Add(record);
                    return list;
                });
                
                if (records.Count >= tasksOptions.OutPutOptions.FlushCount)
                {
                    await FlushAsync(dbName, records);
                    records.Clear();
                }
            }

            foreach (var (db, records) in databaseDict)
            {
                if (records.Count > 0)
                {
                    await FlushAsync(db, records);
                    records.Clear();
                }
            }

            databaseDict.Clear();
            _logger.LogInformation("***** Mysql output thread completed *****");
        }, tasksOptions.OutPutOptions.OutPutTaskCount);

        await _taskManager.WaitAll();
        //_context.CompleteOutput();
        _logger.LogInformation("***** Mysql output service completed *****");

    }

    private async Task FlushAsync(string dbName, IEnumerable<DataRecord> records)
    {
        var count = 0;
        var connStr = _outputOptions.Value.ConnectionString ?? throw new InvalidOperationException("ConnectionString is null");
        await using var output = new MySqlDestination($"{connStr};Database={dbName};", _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);
    }
}