using System.Text;

namespace InnovEnergy.App.SaliMax;

public class LogFileConcatenator
{
    private readonly string _logDirectory;

    public LogFileConcatenator(String logDirectory = "LogDirectory/")
    {
        _logDirectory = logDirectory;
    }

    public String ConcatenateFiles(int numberOfFiles)
    {
        var logFiles = Directory
            .GetFiles(_logDirectory, "log_*.csv")
            .OrderByDescending(file => file)
            .Take(numberOfFiles)
            .OrderBy(file => file)
            .ToList();

        var concatenatedContent = new StringBuilder();

        foreach (var fileContent in logFiles.Select(File.ReadAllText))
        {
            concatenatedContent.AppendLine(fileContent);
            //concatenatedContent.AppendLine(); // Append an empty line to separate the files // maybe we don't need this 
        }

        return concatenatedContent.ToString();
    }
}