/// <summary>
/// this method is about Choosing options in the menu
/// </summary>
/// <param name="mediaArray">array of Media</param>
/// <returns>true</returns>
private static bool Choice(Media[] mediaArray)
{
//create Books list
List <Book> Books = new List <Book>();
//create Movies list
List <Movie> Movies = new List <Movie>();
//create Songs list
List <Song> Songs = new List <Song>();
//store the object data in the assigned list according to the type of object
foreach (Media element in mediaArray)
{
if (element is Book)
{
Books.Add((Book)element);
}
else if (element is Movie)
{
Movies.Add((Movie)element);
}
else if (element is Song)
{
Songs.Add((Song)element);
}
}
//diplay the menu option
DisplayMenu();
while (true)
{
//get the input from the user
string input = Console.ReadLine();
Console.WriteLine();
//show the error if the user's input is wrong
if ((int.TryParse(input, out int userSelection) == false) ||
userSelection < 1 || userSelection > 6)
{
Console.WriteLine("\n*** Invalid Choice - Try Again ***\n");
Console.WriteLine("\nPress any key to continue . . .");
input = Console.ReadLine();
Console.Clear();
DisplayMenu();
continue;
}
//display the output according to the user's input
if (userSelection == 1)
{
//foreach statement of the Books list
foreach (Book element in Books)
{
//display the information
Console.WriteLine(element.ToString());
Console.WriteLine("-----------------------");
}
}
else if (userSelection == 2)
{
foreach (Movie element in Movies)
{
Console.WriteLine(element.ToString());
Console.WriteLine("-----------------------");
}
}
else if (userSelection == 3)
{
foreach (Song element in Songs)
{
Console.WriteLine(element.ToString());
Console.WriteLine("-----------------------");
}
}
else if (userSelection == 4)
{
foreach (Media element in mediaArray)
{
Console.WriteLine(element.ToString());
Console.WriteLine("-----------------------");
}
}
else if (userSelection == 5)
{
Console.Write("\nEnter a search string: ");
//get the keyword from the user
string keyword = Console.ReadLine();
Console.WriteLine();
//foreach statement of the mediaArray array
int keywordResultCount = 0;
foreach (Media element in mediaArray)
{
//check the keyword is found or not
if (element.Search(keyword))
{
//check the keyword is Book object
if (Books.Contains(element))
{
Book book = (Book)element;
Console.WriteLine(element.ToString());
//decrpt the Summary and display on the screen
Console.WriteLine("Summary: " + book.Decrypt());
Console.WriteLine("-----------------------");
book.Encrypt();
keywordResultCount++;
}
//check the keyword is Movies object
else if (Movies.Contains(element))
{
Movie movie = (Movie)element;
Console.WriteLine(element.ToString());
//decrpt the Summary and display on the screen
Console.WriteLine("Summary: " + movie.Decrypt());
Console.WriteLine("-----------------------");
movie.Encrypt();
keywordResultCount++;
}
//keyword is Song object
else
{
Console.WriteLine(element.ToString());
Console.WriteLine("-----------------------");
keywordResultCount++;
}
}
else
{
if (keywordResultCount > 0)
{
Console.WriteLine(keywordResultCount + " results are found");
}
else
{
Console.WriteLine("No search result");
}
break;
}
if (keywordResultCount == mediaArray.Length)
{
Console.WriteLine(keywordResultCount + " results are found");
}
}
}
else
{
// if userSelection is 6, then exit
break;
}
Console.WriteLine("\nPress any key to continue . . .");
string continueInput = Console.ReadLine();
if (continueInput != null)
{
//clear the screen and show the display menu
Console.Clear();
DisplayMenu();
}
}
return(true);
}
