using ConsoleApp2.Entities;
using ConsoleApp2.Helpers;
using Microsoft.Extensions.Logging;
using ServiceStack.Text;

namespace ConsoleApp2.Services;

public class JsvSource : IDisposable
{
    private readonly string _filePath;
    private readonly JsvStringSerializer _jsv;
    private readonly StreamReader _reader;
    // ReSharper disable once PrivateFieldCanBeConvertedToLocalVariable
    private readonly ILogger? _logger;
    private readonly string _tableName;

    public DataRecord Current { get; protected set; } = null!;
    public string[]? Headers { get; }
    public bool EndOfSource => _reader.EndOfStream;

    public JsvSource(string filePath, string[]? headers = null, ILogger? logger = null)
    {
        _filePath = filePath;
        _jsv = new JsvStringSerializer();
        _reader = new StreamReader(filePath);
        Headers = headers;
        _logger = logger;
        // _logger?.LogInformation("Reading file: {FilePath}", filePath);
        _tableName = DumpDataHelper.GetTableName(filePath);
    }
    
    public async ValueTask<bool> ReadAsync()
    {
        var str = await _reader.ReadLineAsync();
        if (string.IsNullOrEmpty(str))
            return false;
        var fields = _jsv.DeserializeFromString<string[]>(str);
        
        Current = new DataRecord(fields, _tableName, Headers);
        return true;
    }

    public void Dispose()
    {
        _reader.Dispose();
    }
}