/*
 *Progamer's Name: Dillon Bong Zi Hang
 *Program Description: Library Management System Login Menu
 *Last Updated: 24 - January - 2016
 */

// Header File
#include"LMS_Header.h"

/* Library Management System Login Menu  */

int main(void)
{
	// Label A for invalid input in Login
	A:

	// Get username and password and ignore whitespace
	printf("***********************************************\n");
	printf("*           Library Management System         *\n");
	printf("***********************************************\n\n");
	printf("Username: ");
	scanf("%s", &u);
	fflush(stdin);
	printf("\nPassword: ");
	scanf("%s", &p);
	fflush(stdin);

	// Entered username and password is equal to Admin
	if ((stricmp(username, u)) == 0 && (strcmp(password, p)) == 0)
	{
		// Login success from login menu. Go to Main Menu
		{
			printf("\nLogin Successful\n\n");
			system("pause");
			system("cls");
			Main_Menu();
		}
	}
	else
	{
	// Login failed from login menu. Re-enter username and password
		printf("\nLogin Failed\n\n");
		system("pause");
		system("cls");
		goto A;
	}
	system("pause>nul");
	return 0;
	getch();
}

/* Library Management System Main Menu */
Main_Menu(void)
{
	printf("***********************************************\n");
	printf("*           Main Menu                         *\n");
	printf("***********************************************\n\n");
	printf("1. Add New Book\n");
	printf("2. Modify Book Details\n");
	printf("3. Remove Book\n");
	printf("4. View Book List\n");
	printf("5. Book Check In\n");
	printf("6. Book Check Out\n");
	printf("7. Search Menu\n");
	printf("8. View Logs\n");
	printf("9. Exit\n\n");
	printf("Please select an option: ");
	{
		// Gets user's option
		gets(main_menu_option);
		// if user confirmation's string length is equal to 1
		if (strlen(main_menu_option) == 1)
		{
			switch (main_menu_option[0])
			{
				// Goto Add New Book Menu
				case '1':
					fflush(stdin);
					system("cls");
					Add_New_Book();
					break;
					// Goto Modify Book Details
				case '2':
					fflush(stdin);
					system("cls");
					Modify_Book_Details();
					break;
				case '3':
					printf("");
					break;
				case '4':
					printf("");
					break;
				case '5':
					printf("");
					break;
				case '6':
					printf("");
					break;
				case '7':
					printf("");
					break;
				case '8':
					printf("");
					break;
				case '9':
					// Terminating the Program
					printf("\nProgram will now terminate. Press any key to continue");
					system("pause>nul");
					exit(0);
					break;
				default:
					// Invalid Input from the user
					printf("\nInvalid input please re-enter an option");
					system("pause>nul");
					system("cls");
					Main_Menu();
					break;
			}
		}
		else
		{
			printf("\nInvalid input please re-enter an option");
			system("pause>nul");
			system("cls");
			Main_Menu();
			fflush(stdin);
		}

	}
}


/* Add New Book Menu */
void Add_New_Book(void)
{
	struct Books_Data t;
	{
		// Open Book Data Text File in append or create binary mode
		file_pointer = fopen("Book Data.dat", "ab");
		// If file is unable to open, then display error
		if (file_pointer == NULL)
		{
			printf("\nFile cannot be opened.");
			system("pause>nul");
			system("cls");
			Main_Menu();
		}
		else
		{
			printf("***********************************************\n");
			printf("*               Add New Book                  *\n");
			printf("***********************************************\n\n");

			// Accept Book ID as input
			printf("1. Book ID: ");
			gets(t.Book_ID);
			fflush(stdin);

			// Accept Book Title as input
			printf("\n2. Book Title: ");
			gets(t.Book_Title);
			fflush(stdin);

			// Accept Book Edition as input
			printf("\n3. Book Edition: ");
			gets(t.Book_Edition);
			fflush(stdin);

			// Accept Year of Publication as input
			printf("\n4. Year of Publication: ");
			gets(t.Year_of_Publication);
			fflush(stdin);

			// Accept Shelf Location as input
			printf("\n5. Shelf Location: ");
			gets(t.Shelf_Location);
			fflush(stdin);

			// Accept Price as input
			printf("\n5. Price(RM): ");
			gets(t.Price);
			fflush(stdin);

			// Do loop to confirm data
			printf("\nConfirm (y/n)? Type esc to return to Main Menu: ");
			do
			{
				// Set num equals to 0
				num = 0;
				gets(add_new_book_confirm);
				fflush(stdin);
				// Compare user input to escape
				if (stricmp(add_new_book_confirm, escape) != 0)
				{
					// if user confirmation's string length is equal to 1
					if (strlen(add_new_book_confirm) == 1)
					{
						switch (add_new_book_confirm[0])
						{
							// Save all data into file
							case 'y':
							{
								fwrite(&t, sizeof(t), 1, file_pointer);
								fclose(file_pointer);
								fflush(stdin);
								num1 = 0;
								printf("\nRecord Successfully Added. Add new book (y/n): ");
								// Do loop to get add new book input
								do
								{
								gets(add_more_book_confirm);
								fflush(stdin);
									if (strlen(add_more_book_confirm) == 1)
									{
										switch (add_more_book_confirm[0])
										{
										case 'y':
											system("cls");
											Add_New_Book();
											break;
										case 'n':
											system("cls");
											Main_Menu();
											break;
										default:
											fflush(stdin);
											printf("\nInvalid input. Please Re-Enter Confirmation to Add New Book: ");
											num1++;
										}
									}
									else
									{
										fflush(stdin);
										printf("\nInvalid input. Please Re-Enter Confirmation to Add New Book: ");
										num1++;
									}
								} while (num1 == 1);
							break;
							}
							// Return to Add New Book Menu
							case 'n':
							{
								fflush(stdin);
								fclose(file_pointer);
								system("cls");
								Add_New_Book();
								break;
							}
							// Invalid Input. Re-enter user confirmation and increment 1 to num
							default:
							{
								fflush(stdin);
								printf("\nInvalid input. Please Re-Enter Confirmation: ");
								num++;
								break;
							}
						}
					}
					else
					{
						// Invalid Input. Re-enter user confirmation and increment 1 to num
						printf("\nInvalid input. Please Re-Enter Confirmation: ");
						num++;
					}

				}
				// User input equals to esc then return to main menu
				else if (stricmp(add_new_book_confirm, escape) == 0)
				{
					fclose(file_pointer);
					printf("\nThe program will now return to Main Menu");
					system("pause>nul");
					system("cls");
					Main_Menu();
				}
			// Do while num equals to 1
			} while (num == 1);
		}
	}
}

int Modify_Book_Details(void)
{
	printf("***********************************************\n");
	printf("*              Modify Book Details            *\n");
	printf("***********************************************\n\n");

}