package class5_2_PathsAndFiles;// Dr. Yoder. MSOE. 12 January 2017

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.InputMismatchException;
import java.util.Iterator;
import java.util.Scanner;
import java.util.stream.Stream;

public class PathDriver {
    public static void main(String[] args) {
        // main(args); to get a StackOverflowError

        Scanner in = new Scanner(System.in);
        System.out.println("This is a text-based program that allows \n" +
                "you to explore the files on your computer.");

        String name;
        do {
            System.out.println("The files in your current directory are: ");
            Path path = Paths.get("./example");
//            Path path = Paths.get("C:\\d\\MyDocs\\Documents\\msoe\\class\\17q2\\se1021\\cfarc");
//            for(Path folder: path) {
//                System.out.println("folder = " + folder);
//            }
            System.out.println("path = " + path);
            System.out.println("Files.exists(path) = " + Files.exists(path));
            System.out.println("Files.isDirectory() = " + Files.isDirectory(path));
            System.out.println("Files.isRegularFile(path) = " + Files.isRegularFile(path));
            try {
                System.out.println("Files.walk() = " + Files.walk(path));
                Stream<Path> stream =  Files.walk(path);
                Iterator<Path> iterator = stream.iterator();
                while(iterator.hasNext()) {
                    Path subThing = iterator.next();
                    System.out.println("subThing = " + subThing);
                }
            } catch (IOException e) {
                System.out.println("Could not walk directory. Something went wrong!");
                // TODO: Can I recover?
            }
            // Other Throwables
            InputMismatchException e;
            StackOverflowError e2;


            System.out.println("Enter the name of the file or\n" +
                    "directory to select (blank line to exit): ");
            name = in.nextLine();
            Path chosenPath = Paths.get("./example/"+name);
            System.out.println("chosenPath = " + chosenPath);
            System.out.println("Files.isDirectory(path]) = " + Files.isDirectory(chosenPath));
            System.out.println("Files.exists(chosenPath) = " + Files.exists(chosenPath));
            System.out.println("Files.isRegularFile() = " + Files.isRegularFile(chosenPath));

            if(Files.isRegularFile(chosenPath)) {
                System.out.println("Opening the file!");
                try {
                    Scanner fileScanner = new Scanner(chosenPath);
                    while(fileScanner.hasNextLine()) {
                        System.out.println(fileScanner.nextLine());
                    }
                } catch (IOException e3) {
                    System.out.println("Could not open the file, even though it exists!");
                    // TODO: recover somehow?
                }
            } else {
                System.out.println("The chosen file is not a a regular file.   Check the path?");
                System.out.println("chosenPath that could not be opened = " + chosenPath);
            }
        } while (name != null && !name.isEmpty());
        System.out.println("Thank you for using the text-based file explorer!");
    }
}