from dateutil import parser

from datetime import datetime

authors = {

"steven king": "Horror",

"rudyard kipling": "Adventure",

"isaac asimov": "Science Fiction",

"suzanne collins": "YA Fiction"

}

class Book:

def __init__(self, title, dateOfPublication, author, numberOfPages):

self.title = title

self.dateOfPublication = dateOfPublication

self.numberOfPages = numberOfPages

self.author = author

def getInput():

splitInputByBook = []

print("Enter books formatted as Title,Date,Author,Length with date formatted as mm/dd/yyyy or mm-dd-yyyy")

while True:

userInput = input()

splitInputByBook.append(userInput)

if userInput == "":

splitInputByBook.pop()

break

return splitInputByBook

def parseInput(userInput):

if userInput == None or len(userInput) == 0:

raise ValueError("Invalid Input") from None

else:

booksArray = []

for book in userInput:

tempList = book.split(",")

if len(tempList) == 4:

booksArray.append(tempList)

if len(booksArray) == 0:

raise ValueError(

"Invalid Input: Book must be formatted as title,date,author,length")

booksArrayByDetails = []

for book in booksArray:

try:

book[1] = parser.parse(book[1])

except:

raise ValueError(

"Date must be formatted in mm/dd/yyyy or mm-dd-yyyy") from None

try:

book[3] = int(book[3])

except ValueError:

raise ValueError(

"Invalid Input: Number of pages must be a valid number") from None

booksArrayByDetails.append(

Book(book[0], book[1], book[2].lower(), book[3]))

return booksArrayByDetails

def findAuthorWithMostBooks(books):

dictionary = {}

for book in books:

if book.author not in dictionary:

dictionary[book.author] = 1

else:

dictionary[book.author] += 1

maxNumberOfBooks = max(dictionary.values())

mostBooksAuthorsList = []

for author in dictionary:

if dictionary[author] == maxNumberOfBooks:

mostBooksAuthorsList.append(author)

mostBooksAuthorObjects = []

for author in mostBooksAuthorsList:

for book in books:

if book.author == author:

mostBooksAuthorObjects.append(book)

return mostBooksAuthorObjects

def findOldestBook(books):

neededBook = books[0]

oldestBook = parser.parse("12/31/2500")

for book in books:

currentDate = book.dateOfPublication

if currentDate < oldestBook:

oldestBook = currentDate

neededBook = book

return neededBook

def getGenre():

try:

genre = authors[neededBook.author]

except KeyError as e:

raise KeyError(

f"Sorry but {e} is not in the given list of authors") from None

print(f"{neededBook.title}, written by {genre} writer {neededBook.author.title()} on {neededBook.dateOfPublication.strftime('%m/%d/%Y')} is {neededBook.numberOfPages} pages long")

#Calling Functions

splitInputByBook = getInput()

books = parseInput(splitInputByBook)

mostBooksAuthorObjects = findAuthorWithMostBooks(books)

neededBook = findOldestBook(mostBooksAuthorObjects)

getGenre()