package com.iluwatar.model.view.presenter;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

/**
 * Every instance of this class represents the Model component in the Model-View-Presenter
 * architectural pattern.
 * <p>
 * It is responsible for reading and loading the contents of a given file.
 */
public class FileLoader {

  /**
   * Indicates if the file is loaded or not.
   */
  private boolean loaded = false;

  /**
   * The name of the file that we want to load.
   */
  private String fileName;

  /**
   * Loads the data of the file specified.
   */
  public String loadData() {
    try {
      BufferedReader br = new BufferedReader(new FileReader(new File(this.fileName)));
      StringBuilder sb = new StringBuilder();
      String line;

      while ((line = br.readLine()) != null) {
        sb.append(line).append('\n');
      }

      this.loaded = true;
      br.close();

      return sb.toString();
    } catch (Exception e) {
      e.printStackTrace();
    }

    return null;
  }

  /**
   * Sets the path of the file to be loaded, to the given value.
   * 
   * @param fileName The path of the file to be loaded.
   */
  public void setFileName(String fileName) {
    this.fileName = fileName;
  }

  /**
   * @return fileName The path of the file to be loaded.
   */
  public String getFileName() {
    return this.fileName;
  }

  /**
   * @return True, if the file given exists, false otherwise.
   */
  public boolean fileExists() {
    return new File(this.fileName).exists();
  }

  /**
   * @return True, if the file is loaded, false otherwise.
   */
  public boolean isLoaded() {
    return this.loaded;
  }
}
