using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MedsProcessor.Common;
using MedsProcessor.Common.Models;

namespace MedsProcessor.WebAPI.Core
{
  public class HzzoData
  {
    public HzzoData(AppPathsInfo appPaths)
    {
      this._appPaths = appPaths;
    }

    private ISet<HzzoMedsDownloadDto> _set;
    private readonly AppPathsInfo _appPaths;

    public ISet<HzzoMedsDownloadDto> Set
    {
      get => _set ??
        throw new InvalidOperationException("The dataset was not loaded.");

      private set
      {
        if (_set != null)
          throw new InvalidOperationException("The dataset was already loaded.");

        _set = value ??
          throw new InvalidOperationException("The loaded dataset can not be null.");
      }
    }

    internal void Load(ISet<HzzoMedsDownloadDto> data) =>
      Set = data;

    internal bool IsLoaded() =>
      _set != null && _set.All(x => x.IsDownloaded && x.IsDataParsed);

    internal void Clear()
    {
      _set = null;

      var downloadDir = Path.Combine(_appPaths.ApplicationRootPath, Constants.DOWNLOAD_DIR);
      Directory.Delete(downloadDir, true);
    }
  }
}