manager.py

import json
from dataclasses import dataclass,asdict
from my_package import json_utilities 
file_name = "library.json"
library = json_utilities.load_file(file_name)

@dataclass
class BookBlueprint:
    title:str
    author_name:str
    isbn:str
    year:int
    availability:str

def add_book():
    print("You choose option 1, Please enter the details:\n")
    title = input("Please enter book title: ")
    author_name = input("Please enter author name: ")
    while True:
        check = True
        isbn = input("Please enter isbn number: ")
        isbn = isbn.replace("-","")
        if len(isbn) == 13:
            if library:
                for lib in library:
                    if lib:
                        if lib["isbn"] == isbn:
                            check =False
                            print("A book with this ISBN already exists\n")
                            break
            if check:
                break
        else:
            print("Not the correct format Please enter a 13 digit ISBN\n")
    while True:
        try:
            year = int(input("Please enter book published year: "))
            if len(str(year)) == 4:
                break
            else:
                print("Please enter year in YYYY format\n")
        except ValueError:
            print("Please enter a integer value only\n")
    availability = "Available"
    if library:
        library.append(asdict(BookBlueprint(title,author_name,isbn,year,availability)))
        json_utilities.save_file(file_name,library)
        print(f"The Book {title} by {author_name} has been added to the Library\n")

def print_books(lib):
    for key,val in lib.items():
        print(f"{key} : {val}")
    print()
def view_books():
    print("You choose option 2, Here are all the books:\n")
    check = False
    if library:
        for lib in library:
            if lib :
                check = True
                print_books(lib)
    if not check:
        print("No books exist Start adding now\n")
def search_book_by(what,value):
    if library:
        check = False
        for lib in library:
            if lib :
                if lib[what] == value:
                    check=True
                    print_books(lib)
        if not check:
            print(f"The book with this {what} : {value} doesn't exist\n")
    else:
        print("The library is empty\n")

def search_book(by_what,value):
    print("You choose option 3 Lets search:\n")
    if by_what.lower() == "title":
        search_book_by("title",value)
    elif by_what.lower() == "isbn":
        search_book_by("isbn",value)
    elif by_what.lower() == "author":
        search_book_by("author_name",value)
    elif by_what.lower() == "year":
        value = int(value)
        search_book_by("year",value)
    elif by_what.lower() == "availability":
        search_book_by("availability",value)
    else:
        print(f"You can't search using {by_what}\n")

def update_book(isbn):
    print("You choose option 4, Let us check the ISBN:\n")
    selected_lib = {}
    if library:
        for lib in library:
            if lib :
                if lib["isbn"] == isbn:
                    print("ISBN verified\n")
                    selected_lib = lib
                    try:
                        ask_user = int(input("What would you like to update\n" \
                        "1.Title\n" \
                        "2.Author\n" \
                        "3.ISBN\n" \
                        "4.Year\n" \
                        "5.Availibility\n" \
                        "6.Cancel"))
                        if ask_user==1:
                            ask_title = input("Please enter updated title\n")
                            print(f"The book {selected_lib["title"]} was updated to {ask_title}\n")
                            selected_lib["title"] = ask_title
                            json_utilities.save_file(file_name,library)
                            break
                        elif ask_user == 2:
                            ask_author = input("Please enter updated Author\n")
                            print(f"The book {selected_lib["title"]} author was updated to {ask_author} from {selected_lib["author_name"] }\n")
                            selected_lib["author_name"] = ask_author
                            json_utilities.save_file(file_name,library)
                            break
                        elif ask_user == 3:
                            isbn = input("Please enter updated ISBN\n")
                            check = True
                            for lib_nest in library:
                                if lib_nest:
                                    if lib_nest != selected_lib and lib_nest["isbn"] == isbn:
                                        check =False
                                        print("A book with this ISBN already exists\n")
                                        break
                            if check:
                                print(f"The book {selected_lib["title"]} ISBN was updated to {isbn} from {selected_lib["isbn"]}\n")
                                selected_lib["isbn"] = isbn
                                json_utilities.save_file(file_name,library)
                        elif ask_user == 4:
                            while True:
                                try:
                                    year = int(input("Please enter updated year: "))
                                    if len(str(year)) == 4:
                                        break
                                    else:
                                        print("Please enter year in YYYY format\n")
                                except ValueError:
                                    print("Please enter a integer value only\n")
                            print(f"The book {selected_lib["title"]} published year was updated to {year} from {selected_lib["year"]}\n")
                            selected_lib["year"] = year
                            json_utilities.save_file(file_name,library)
                        elif ask_user == 5:
                            avail = input("Please enter updated availability: ").lower()
                            if avail == "available" or avail == "borrow":
                                print(f"The book {selected_lib["title"]} availability was updated to {avail.title()} from {selected_lib["availability"]}\n")
                                selected_lib["availability"] = avail.title()
                                json_utilities.save_file(file_name,library)
                        elif ask_user == 6:
                            return
                        else:
                            print("Please enter a value between 1-6 only\n")
                    except ValueError:
                        print("Please enter a integer Value only\n")

    else:
        print("The Library is empty")
def remove_book():
    print("You choose option 5:\n")
    check = True
    user = input("Please enter the book ISBN(without -) you want to borrow: ")
    if library:
        for lib in library:
            if lib :
                if lib["isbn"] == user:
                    check = False
                    print(f"The Book {lib["title"]} is removed\n")
                    library.remove(lib)
                    json_utilities.save_file(file_name,library)
        if check:
            print("This book doesn't exist\n")
    else:
        print("The Library is empty")
def borrow_book():
    print("You choose option 6:\n")
    check = True
    user = input("Please enter the book ISBN you want to borrow: ")
    if library:
        for lib in library:
            if lib :
                if lib["isbn"] == user and lib["availability"] != "Borrow":
                    check = False
                    print(f"The book {lib["title"]} is available you can borrow it\n")
                if not check:
                    lib["availability"] = "Borrow"
                    json_utilities.save_file(file_name,library)
                    break
        if check:
            print("This book is already borrowed or doesn't exist")
    else:
        print("The Library is empty")

def return_book():
    print("You choose option 7:\n")
    check = True
    user = input("Please enter the book ISBN you want to return: ")
    if library:
        for lib in library:
            if lib :
                if lib["isbn"] == user and lib["availability"] != "Available":
                    check = False
                    print(f"Thanks for using our library and returning The book {lib["title"]} \n")
                if not check:
                    lib["availability"] = "Available"
                    json_utilities.save_file(file_name,library)
                    break
        if check:
                print("This book is already returned or doesn't exist")
    else:
        print("The Library is empty")