// Fig. 20.12: Book.cpp
// Book member-function definitions.
#include <fmt/format.h>
#include <iostream>
#include <memory>
#include <string>
#include <string_view>
#include "Author.h"
#include "Book.h"

Book::Book(std::string_view bookTitle) : title(bookTitle) {}

Book::~Book() {
   std::cout << fmt::format("Destroying Book: {}\n", title);
}

// print the name of this Book's Author
void Book::printAuthorName() {
   // if weakAuthorPtr.lock() returns a non-empty shared_ptr
   if (std::shared_ptr<Author> authorPtr{weakAuthorPtr.lock()}) {
      // show the reference count increase and print the Author's name
      std::cout << fmt::format("Reference count for Author {} is {}\n",
         authorPtr->name, authorPtr.use_count());
      std::cout << fmt::format("The book {} was written by {}\n",
         title, authorPtr->name);
   }
   else { // weakAuthorPtr points to NULL
      std::cout << "This Book has no Author.\n";
   }
}


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