import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class DirectoryFilesCollector {

		public ArrayList<File> fileArraySource(String pPathToDirectory) {
			//pPathToDirector example: "D:/pdf/"
			String directoryPath = pPathToDirectory; 
	        File directory = new File(directoryPath);
			ArrayList<File> filesInDirectory = new ArrayList<>();
			
	        if (directory.exists() && directory.isDirectory()) {
	            File[] files = directory.listFiles();
	            if (files != null) {
	                for (File file : files) {
	                    filesInDirectory.add(file);
	                }
	            }
	        } else {
	            System.out.println("Directory does not exist or is not a directory.");
	        }

	        // Now filesInDirectory contains all the File objects from the specified directory
	        /* test:
	        for (File file : filesInDirectory) {
	            System.out.println(file.getName());
	        }
			*/
	        // sort:
	        filesInDirectory.sort(null);
			return filesInDirectory;
		}
		
		public ArrayList<String> fileAsArrayOfString(String pPathToDirectory) {
			ArrayList<File> filesInDirectory = new ArrayList<>();
			
			filesInDirectory = fileArraySource(pPathToDirectory);
					
			ArrayList<String> strFilesInDirectory = new ArrayList<String>();
            for (File file : filesInDirectory) {
                strFilesInDirectory.add(file.getName());
            }
            strFilesInDirectory.sort(null);
			return strFilesInDirectory;
		}
		
		public ArrayList<String> getAbsolutePathAsArrayOfString(String pPathToDirectory) {
			ArrayList<File> filesInDirectory = new ArrayList<>();
			
			filesInDirectory = fileArraySource(pPathToDirectory);
					
			ArrayList<String> strFilesInDirectory = new ArrayList<String>();
            for (File file : filesInDirectory) {
                //strFilesInDirectory.add(file.getName());
                strFilesInDirectory.add(file.getAbsolutePath());
            }
            strFilesInDirectory.sort(null);
			return strFilesInDirectory;
		}
		
		public ArrayList<String> getCanonicalPathAsArrayOfString(String pPathToDirectory) {
			ArrayList<File> filesInDirectory = new ArrayList<>();
			
			filesInDirectory = fileArraySource(pPathToDirectory);
					
			ArrayList<String> strFilesInDirectory = new ArrayList<String>();
            for (File file : filesInDirectory) {
                try {
					strFilesInDirectory.add(file.getCanonicalPath());
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
            }
            strFilesInDirectory.sort(null);
			return strFilesInDirectory;
		}
		
		public ArrayList<File> getFilteredArrayOfFiles (String pPathToDirectory, String pToken) {
			ArrayList<File> filesInDirectory = new ArrayList<>();
			
			filesInDirectory = fileArraySource(pPathToDirectory);
			ArrayList<File> filteredFilesInDirectory = new ArrayList<File>();
			for(File file: filesInDirectory) {
				if( file.getName().toLowerCase().contains(pToken.toLowerCase())) {
				filteredFilesInDirectory.add((file));
				}
			}
				filteredFilesInDirectory.sort(null);
				return filteredFilesInDirectory;
			}
		}