import java.util.*;
import java.io.*;

public class Library {

	/**
	 * Description: 	This Program take book names, its writer and isbn from a library.txt file.
	 * 					you can list books by its writer, also take and return it.
	 * 					you must include the library.txt file in the same folder.
	 * Author:			Naqibullah Danishjo.
	 * Date: 			06/01/2010 at 02:45
	 * contact:			danishjo.webs.com
	 * E-mail: 			danishjo@yashlar.net
	*
	* library.txt Example : copy the text bellow and paste in a text file called library. you can add 
	* more books in this format. 


	* Gazali KimyayiSaadet 252525
	* Mawlana Mathanawi 246896
	* Sadi Gulistan 121223
	* Attar PandNama 454554
	* Hafez DiwanHafez 787878
	* Nizami Ganjnama 458569
	* sadi	bostan 25345

	*/
	
	
	public static void main(String[] args) throws FileNotFoundException  {
		
		char select='0';
		System.out.println("\t\t\tWelcome To Danishjo Library");
		System.out.println("\t\t\t***************************");
		System.out.println("___________________________");
		file("library.txt");
		select= menu();
		
		
		while (select != '6')
		{
			if (select == '1')
			{
				// get book method
				int get=getBook();
				if (get==1){
					System.out.println("Book Succesfully Has Gotten.");
					System.out.println("___________________________");
				}
				else if(get==-1){
					System.out.println("Book not found!");
					System.out.println("_______________");
				}
				else if(get==0){
					System.out.println("Book has already been taken.");
					System.out.println("____________________________");
				}
			}
			else if (select == '2')
			{
				// list all book
				listAll();
			}
			else if (select == '3')
			{
				//list by writer
				if (!byWriter())
				{
					System.out.println("No Book For The Given Writer");
					System.out.println("_____________________________");
				}	
			}
			else if (select == '4')
			{
				// return book
				int get2 = returnBook();
				if(get2==1){
					System.out.println("book successfully returned");
					System.out.println("___________________________");
				}
				else{
					System.out.println("Sorry. Book not found!!");
					System.out.println("_______________________");
				}
				
			}
			else if(select=='5'){
				if (!FindBook())
				{
					System.out.println("Book Not Found");
					System.out.println("_______________");
				}
			}
			
			else 
			{
				// invalid selection//
				System.out.println("INVALID SELECTION. PLEASE ENTER THE NUMBER RESPECT TO THE ACTION");
			}
			select  = menu();
		}
		System.out.println("\t\t_________Thank you for using our Library_______");
		
	}
	public static boolean FindBook(){
		Scanner input = new Scanner(System.in);
		System.out.print("Book name required : ");
		String book = input.next();
		for(int i=0; i<bookNum;i++){
			if(book.equalsIgnoreCase(books[i])){
				System.out.println("book: "+books[i]+"\t\tISBN: "+isbns[i] +"\t\tWriter: "+writers[i]+"\t\t "+available[i]);
				System.out.println("__________________________________________________________________________________");
				return true;
			}
		}
		return false;
	}
	public static int returnBook(){
		System.out.print("Book name required : ");
		Scanner input = new Scanner(System.in);
		String book = input.next();
		for(int i=0; i<takenCounter;i++){
			if(book.equalsIgnoreCase(takens[i])){
				//books[i]=book;
				takens[i] = "";
				
				for( int j=0; j<bookNum; j++){
					if(book.equalsIgnoreCase(books[j])){
						available[j] = "Available";
					}
				}
				return 1;
			}
		}
		return -1;
	}
	
	public static boolean byWriter(){
		boolean check = false;
		Scanner input = new Scanner(System.in);
		System.out.print("writer name required : ");
		String writer = input.next();
		for(int i=0;i<bookNum;i++){
			if(writer.equalsIgnoreCase(writers[i])){
				System.out.println("Writer: "+writers[i]+"\t\t book: "+books[i]+"\t\tISBN: "+isbns[i] +"\t\t "+available[i]);
				check = true;
			} 
		}
		System.out.println("__________________________________________________________________________________");
		if (check)
		{
			return true;
		}
		return false;
	}
	public static void listAll(){
			for(int i=0;i<bookNum; i++){
	            	System.out.println((i+1)+"."+books[i]+"\t\t\tWriter: "+writers[i]+"\t\tISBN: "+isbns[i] +"\t\t"+available[i]);
			}
			System.out.println("__________________________________________________________________________________");
	}
	
	public static int getBook(){
		Scanner console = new Scanner(System.in);
		System.out.println("book name please: ");
		String s1= console.nextLine();
		for (int i=0; i<takenCounter; i++)
		{
			if(s1.equalsIgnoreCase(takens[i])){
				return 0;
			}
		}
		for( int j=0; j<bookNum; j++){
			if(s1.equalsIgnoreCase(books[j])){
				for (int i=0; i<takenCounter; i++)
				{
					if (takens[i] == "")
					{
						takens[i]=s1;
						available[j] = "Unavailable";
						return 1;
					}
				}
				takens[takenCounter]=s1;
				takenCounter++;
				available[j] = "Unavailable";
				return 1;
			}
		}
		return -1;
	}
	
	public static String[] writers = new String[100];
	public static  String[] books = new String[100];
	public static int [] isbns = new int[100];
	public static String [] available = new String[100];
	public static String[] takens = new String[100];
	public static int bookNum = 0;
	public static int takenCounter=0;
	public static char menu(){
		String select;
	
		System.out.println("1.get a book");
		System.out.println("2.list all books");
		System.out.println("3.list by writer");
		System.out.println("4.return book");
		System.out.println("5.search by book");
		System.out.println("6.exit");
		System.out.println("___________________");
		System.out.print("Select An Action : ");
		Scanner console= new Scanner(System.in);
		select = console.next();	
		return select.charAt(0);
		
	}
	
	public static void file(String file) throws FileNotFoundException {
		Scanner input = new Scanner(new File(file));
        int i=0;
		while (input.hasNextLine()) {
	            String line = input.nextLine();
	            Scanner lineScan = new Scanner(line);
	            while(lineScan.hasNext()){
	            	writers[i]=lineScan.next();
	            	books[i] = lineScan.next();
	            	isbns[i]= lineScan.nextInt();
	            	available[i] = "Available";
	            	i++;
	            	bookNum++;
	            }
		}
	
		
	
	}

}