Chris_Ching's_Swift_Chalange_03

//
// CodeWithChris Learn Swift for Beginners
// http://codewithchris.com/learn-swift
//
// Challenge #3: The Library Challenge
//
// Instructions:
// Complete the class definition so that you get the expected output in the console(specified below the class definitions). See TODOs.
//

class Person {

    var name:String!

    init(_ fullName:String) {
        name = fullName
    }
}


//let newPerson = Person("Sebet")



class Book {

    var title:String!
    var author:String!

    init(_ bookTitle:String, _ bookAuthor:String) {
        title = bookTitle
        author = bookAuthor
    }

}

//let newBook = Book("The Adventures of Tom Soyare", "Samuel Longhorn Clemens")

// --- Your code goes below this line ---

class Library {

    var catalogue = ["ORW":Book("1985", "George Orwell"), "RAY":Book("Fahrenheit 451", "Ray Bradbury")]
    var checkedOutBooks = [String:Person]()

    func searchByTitle(_ title:String) -> String {

        // TODO: This function searches the catalogue dictionary for a title
        //
        // Returns "Available" if the book exists and isn't checked out
        //
        // Returns "Checked out by name" if the book exists and is checked out
        //
        // Returns "Not in catalogue" if the book doesn't exist

        for item in catalogue {
            if item.value.title.lowercased() == title.lowercased() && checkedOutBooks[item.key] == nil {
                return "Available"
            } else if item.value.title.lowercased() == title.lowercased() && checkedOutBooks[item.key] != nil {
                return "Checked out by " + (String)(checkedOutBooks[item.key]?.name ?? "nobody")
            }
        }

        return "Not in catalogue"
    }

    func checkOut(_ bookId:String, _ person:Person) -> String {

        // TODO: This function adds to the checkedOutBooks dictionary
        //
        // Returns "Error: Book already checked out" if the book is already in the checkedOutBooks dictionary
        //
        // Returns "Successfully checked out" and adds the bookId,person key-value pair if the book doesn't currently exist in the checkedOutbooks dictionary
        //
        // Returns "Book doesn't exist" if the book isn't in the catalogue dictionary

        if catalogue[bookId] != nil {
            if checkedOutBooks[bookId] != nil {
                return "Error: Book already checked out"
            } else if checkedOutBooks[bookId] == nil  {
                checkedOutBooks[bookId] = person
                return "Successfully checked out"
            }
        }

        return "Book doesn't exist"
    }

    func checkIn(_ bookId:String) -> String {

        // TODO: This function removes the bookId,person key-value pair from the checkedOutBooks dictionary
        //
        // Returns "Book doesn't exist" if the book isn't in the catalogue dictionary
        //
        // Returns "Error: Can't check in a book that hasn't been checked out" if the book wasn't checked out in the first place
        //
        // Returns "Successfully checked in"

        if catalogue[bookId] != nil {
            if checkedOutBooks[bookId] != nil {
                checkedOutBooks.removeValue(forKey: bookId)
                return "Successfully checked in"
            } else if checkedOutBooks[bookId] == nil  {
                return "Error: Can't check in a book that hasn't been checked out"
            }
        }

        return "Book doesn't exist"
    }

}
// --- Your code goes above this line ---

// --- Don't edit or add anything below this line ---

let lib = Library()
let borrower1 = Person("Curious George")
let borrower2 = Person("Mark Twain")

// George searches for a book
let searchResult = lib.searchByTitle("1985")
print(searchResult)

// Expected Output in console:
// "Available"

// George checks out the book
let borrowResult = lib.checkOut("ORW", borrower1)
print(borrowResult)

// Expected Output in console:
// "Successfully checked out"

// Mark searches for a book
let searchResult2 = lib.searchByTitle("1985")
print(searchResult2)

// Expected Output in console:
// "Checked out by Curious George"

// Mark tries to borrow a book that's already checked out
let borrowResult2 = lib.checkOut("ORW", borrower2)
print(borrowResult2)

// Expected Output in console:
// "Error: Book already checked out"

// A book is checked in
let checkInResult = lib.checkIn("RAY")
print(checkInResult)

// Expected Output in console:
// "Error: Can't check in a book that hasn't been checked out"

// George checks in his book
let checkInResult2 = lib.checkIn("ORW")
print(checkInResult2)

// Expected Output in console:
// "Successfully checked in"

// Mark attempts to borrow the book again
let borrowResult3 = lib.checkOut("ORW", borrower2)
print(borrowResult3)

// Expected Output in console:
// "Successfully checked out"