import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.Date;

/**
 * Utility class for loading a collection of books from a text file.
 * 
 * @author Alvin Chao
 * @author R.Grove
 * @version 2016-11-26
 */
public class Driver {

   /**
    * Load the Patron file.
    * 
    * The data file should contain four comma-separated values pre line: name,
    * email, number (int), balance (double)
    * 
    * @param fileName = name of file for input.
    * @return Patron[] array of patrons.
    */
   public static Patron[] loadPatrons(String fileName) {
      ArrayList<Patron> patronList = new ArrayList<>();

      Scanner inFile = null;
      try {
         inFile = new Scanner(new File(fileName));
         while (inFile.hasNextLine()) {
            String[] terms = inFile.nextLine().split(",");
            Patron patron = new Patron(terms[0], terms[1],
                  Integer.parseInt(terms[2].trim()),
                  Double.parseDouble(terms[3].trim()));
            patronList.add(patron);
         }
      } catch (IOException e) {
         System.out.println("Error reading patron file: " + fileName);
         System.exit(0);
      } finally {
         if (inFile != null) {
            inFile.close();
         }
      }

      return patronList.toArray(new Patron[0]);
   }

   /**
    * Load a set of books from the provided file.
    * 
    * @param fileName - The name of the file to load.
    * @param patrons - Array of patron objects one per ptraon from patron file.
    * @return - An array of Book objects, one per Book stored in the file
    */
   public static Book[] loadBooks(String fileName, Patron[] patrons) {
      Book[] books = null;
      String getLine;
      String[] splitLine;
      int rating;
      String[] reviewText;
      int numLines = 0;
      int bookIndex = 0;

      try {
         numLines = countLines(fileName);
         books = new Book[numLines];

         Scanner scanner = new Scanner(new File(fileName));
         // fields: title author year isbn pages
         while (scanner.hasNextLine()) {
            getLine = scanner.nextLine();
            // splitLine = getLine.split("[\\p{Punct}\\s]+");
            splitLine = getLine.split("~");
            String title = splitLine[0];
            String author = splitLine[1];
            String isbn = splitLine[2];
            int year = Integer.parseInt(splitLine[3]);
            int pages = Integer.parseInt(splitLine[4]);
            // create book
            books[bookIndex] = new Book(title, author, isbn, year, pages);
            // setup an initial dueDate of today
            Date dueDate = new Date();
            double rand2 = Math.random() * 60;
            int randLate = (int) rand2;
            dueDate = DateUtils.addDays(dueDate, -randLate);
            int numPatrons = patrons.length;
            // for every 5th book - check it out to a random patron.
            if (bookIndex / 5 == 0) {
               double rand = Math.random() * numPatrons;
               int randPatron = (int) rand;
               books[bookIndex].checkout(patrons[randPatron], dueDate);
            }
            bookIndex++;
         }
      } catch (FileNotFoundException e) {
         System.out.println("Problem reading " + fileName);
      }
      return books;
   }

   /**
    * Helper method for determining the number of lines in the file.
    * 
    * @param fileName - Name of the file
    * @return The number of lines in the file
    * @throws FileNotFoundException If the file cannot be opened for reading
    */
   private static int countLines(String fileName) throws FileNotFoundException {

      int numLines = 0;

      Scanner scanner = new Scanner(new File(fileName));

      while (scanner.hasNextLine()) {
         scanner.nextLine();
         numLines++;
      }
      return numLines;
   }

   /**
    * List all books in the library.
    * 
    * @param catalog = array of all books in libary.
    */
   public static void listCatalog(Book[] catalog) {
      // output the book catalog to the screen
      for (Book book : catalog) {
         String title = book.getTitle();
         String author = book.getAuthor();
         String isbn = book.getIsbn();
         int year = book.getYear();
         int pages = book.getPages();
         int status = book.getStatus();
         Date dueDate = book.getDue();
         System.out.println(title + "\t\t" + author + "\t\t" + isbn + "\t\t"
               + year + "\t\t" + pages + "\t\t" + status + "\t\t" + dueDate);
      }
   }

   /**
    * List the Patron array.
    * 
    * @param patrons The Patron array
    */
   public static void listPatrons(Patron[] patrons) {
      for (Patron patron : patrons) {
         System.out.println(patron.toString());
      }
   }

   /**
    * Main Method. Used to load and test books.
    * 
    * @param args = command line arguments.
    */
   public static void main(String[] args) {
      // filename lflbooks.txt

      String filename = "lflbooks.txt";

      // load patrons from file patrons.txt
      Patron[] patrons = loadPatrons("patrons.txt");

      // load the books from the file into the catalog
      Book[] catalog = loadBooks(filename, patrons);

      Library library = new Library(catalog, patrons);

      // Checkout some default books

      Scanner input = new Scanner(System.in);
      char option;

      do {
         System.out.println("\nEnter an option:");
         System.out.println("  B: List the book catalog");
         System.out.println("  b: List the details of a book");
         System.out.println("  P: List the Patrons");
         System.out.println("  p: List details of a patron");
         System.out.println("  S: Search for a book");
         System.out.println("  O: Check out a book");
         System.out.println("  I: Check in a book");
         System.out.println("  F: Determine the fine amount for a book");
         System.out.println("  Q: Quit");
         System.out.print("Option: ");

         String inLine = input.nextLine();
         if (inLine.length() > 0) {
            option = inLine.charAt(0);
         } else {
            option = ' ';
         }

         if (option == 'B') {
            listCatalog(catalog);
         }
         if (option == 'b') {
            System.out.print("Enter ISBN: ");
            String isbn = input.nextLine();
            for (Book b : catalog) {
               if (isbn.equals(b.getIsbn())) {
                  System.out.println("Title: " + b.getTitle());
                  System.out.println("Author: " + b.getAuthor());
                  System.out.println("Year: " + b.getYear());
                  System.out.println("Pages: " + b.getPages());
                  System.out.println("Status: " + b.getStatus());
                  System.out.println("Due: " + b.getDue());
                  System.out.println("Patron: " + b.getPatron());
               }
            }
         } else if (option == 'P') {
            listPatrons(patrons);
         } else if (option == 'p') {
            System.out.print("Enter Patron Nr: ");
            Integer patronNr = Integer.parseInt(input.nextLine());
            for (int x = 0; x < patrons.length; x++) {
               if (patrons[x].equals(patronNr)) {
                  System.out.println(patrons[x].toString());
               }
            }
         } else if (option == 'S') {
            System.out.print("Enter Title: ");
            String searchTitle = input.nextLine();
            for (Book b : catalog) {
               if (searchTitle.equals(b.getTitle())) {
                  System.out.println("Title: " + b.getTitle());
                  System.out.println("Author: " + b.getAuthor());
                  System.out.println("Year: " + b.getYear());
                  System.out.println("Pages: " + b.getPages());
                  System.out.println("Status: " + b.getStatus());
                  System.out.println("Due: " + b.getDue());
                  System.out.println("Patron: " + b.getPatron());
               }
            }

         } else if (option == 'O') {
            Book book = null;
            Patron patron = null;

            System.out.print("Enter ISBN: ");
            String isbn = input.nextLine();
            for (Book b : catalog) {
               if (isbn.equals(b.getIsbn())) {
                  book = b;
               }
            }
            if (book == null) {
               System.out.println("That ISBN is not in the catalog.");
               continue;
            }

            System.out.print("Enter Patron Nr: ");
            Integer patronNr = Integer.parseInt(input.nextLine());
            for (Patron p : patrons) {
               if (p.equals(patronNr)) {
                  patron = p;
               }
            }
            if (patron == null) {
               System.out.println("That patron number does not exist.");
               continue;
            }

            library.checkout(book, patron);
         } else if (option == 'I') {
            Book book = null;

            System.out.print("Enter ISBN: ");
            String isbn = input.nextLine();
            for (Book b : catalog) {
               if (isbn.equals(b.getIsbn())) {
                  book = b;
               }
            }
            if (book == null) {
               System.out.println("That ISBN is not in the catalog.");
               continue;
            }

            library.checkin(book);

         } else if (option == 'F') {
            System.out.print("Enter ISBN: ");
            String isbn = input.nextLine();
            for (Book b : catalog) {
               if (isbn.equals(b.getIsbn())) {
                  double fine = library.determineFine(b);
                  System.out.printf("Fine: %.2f%n", fine);
               }
            }
         }

      } while (Character.toLowerCase(option) != 'q');

   }
}