|
| 1 | +from .book import Book |
| 2 | +from .member import Member |
| 3 | +from .exceptions import ( |
| 4 | + BookNotAvailableError, |
| 5 | + BookNotFoundError, |
| 6 | + MemberNotFoundError, |
| 7 | + MaxBooksExceededError |
| 8 | +) |
| 9 | + |
| 10 | + |
| 11 | +class LibrarySystem: |
| 12 | + """Main library management system.""" |
| 13 | + |
| 14 | + def __init__(self, name="City Library"): |
| 15 | + self.name = name |
| 16 | + self.books = {} # {isbn: Book} |
| 17 | + self.members = {} # {member_id: Member} |
| 18 | + self.transaction_history = [] |
| 19 | + |
| 20 | + # Book Management |
| 21 | + def add_book(self, isbn, title, author, year, genre, copies=1): |
| 22 | + """Add a new book to the library.""" |
| 23 | + if isbn in self.books: |
| 24 | + # If book exists, just increase copies |
| 25 | + self.books[isbn].total_copies += int(copies) |
| 26 | + self.books[isbn].available_copies += int(copies) |
| 27 | + else: |
| 28 | + self.books[isbn] = Book(isbn, title, author, year, genre, copies) |
| 29 | + return f"Added {copies} copy/copies of '{title}'" |
| 30 | + |
| 31 | + def remove_book(self, isbn): |
| 32 | + """Remove a book from the library.""" |
| 33 | + if isbn not in self.books: |
| 34 | + raise BookNotFoundError(f"Book with ISBN {isbn} not found") |
| 35 | + |
| 36 | + if self.books[isbn].available_copies < self.books[isbn].total_copies: |
| 37 | + return "Cannot remove book: some copies are borrowed" |
| 38 | + |
| 39 | + del self.books[isbn] |
| 40 | + return "Book removed successfully" |
| 41 | + |
| 42 | + def get_book(self, isbn): |
| 43 | + """Get book by ISBN.""" |
| 44 | + if isbn not in self.books: |
| 45 | + raise BookNotFoundError(f"Book with ISBN {isbn} not found") |
| 46 | + return self.books[isbn] |
| 47 | + |
| 48 | + def search_books_by_title(self, title): |
| 49 | + """Search books by title (case-insensitive partial match).""" |
| 50 | + results = [] |
| 51 | + for book in self.books.values(): |
| 52 | + if title.lower() in book.title.lower(): |
| 53 | + results.append(book) |
| 54 | + return results |
| 55 | + |
| 56 | + def search_books_by_author(self, author): |
| 57 | + """Search books by author (case-insensitive partial match).""" |
| 58 | + results = [] |
| 59 | + for book in self.books.values(): |
| 60 | + if author.lower() in book.author.lower(): |
| 61 | + results.append(book) |
| 62 | + return results |
| 63 | + |
| 64 | + def get_books_by_genre(self, genre): |
| 65 | + """Get all books of a specific genre.""" |
| 66 | + results = [] |
| 67 | + for book in self.books.values(): |
| 68 | + if book.genre.lower() == genre.lower(): |
| 69 | + results.append(book) |
| 70 | + return results |
| 71 | + |
| 72 | + def get_available_books(self): |
| 73 | + """Get all available books.""" |
| 74 | + return [book for book in self.books.values() if book.is_available()] |
| 75 | + |
| 76 | + def get_total_books_count(self): |
| 77 | + """Get total number of books in library.""" |
| 78 | + return sum(book.total_copies for book in self.books.values()) |
| 79 | + |
| 80 | + def get_available_books_count(self): |
| 81 | + """Get number of available books.""" |
| 82 | + return sum(book.available_copies for book in self.books.values()) |
| 83 | + |
| 84 | + # Member Management |
| 85 | + def register_member(self, member_id, name, email, membership_type='regular'): |
| 86 | + """Register a new member.""" |
| 87 | + if member_id in self.members: |
| 88 | + return "Member ID already exists" |
| 89 | + |
| 90 | + self.members[member_id] = Member(member_id, name, email, membership_type) |
| 91 | + return f"Member {name} registered successfully" |
| 92 | + |
| 93 | + def remove_member(self, member_id): |
| 94 | + """Remove a member.""" |
| 95 | + if member_id not in self.members: |
| 96 | + raise MemberNotFoundError(f"Member {member_id} not found") |
| 97 | + |
| 98 | + if len(self.members[member_id].borrowed_books) > 0: |
| 99 | + return "Cannot remove member: has borrowed books" |
| 100 | + |
| 101 | + del self.members[member_id] |
| 102 | + return "Member removed successfully" |
| 103 | + |
| 104 | + def get_member(self, member_id): |
| 105 | + """Get member by ID.""" |
| 106 | + if member_id not in self.members: |
| 107 | + raise MemberNotFoundError(f"Member {member_id} not found") |
| 108 | + return self.members[member_id] |
| 109 | + |
| 110 | + def suspend_member(self, member_id): |
| 111 | + """Suspend a member.""" |
| 112 | + member = self.get_member(member_id) |
| 113 | + member.suspend() |
| 114 | + return f"Member {member_id} suspended" |
| 115 | + |
| 116 | + def reactivate_member(self, member_id): |
| 117 | + """Reactivate a suspended member.""" |
| 118 | + member = self.get_member(member_id) |
| 119 | + member.reactivate() |
| 120 | + return f"Member {member_id} reactivated" |
| 121 | + |
| 122 | + # Borrowing and Returning |
| 123 | + def borrow_book(self, member_id, isbn, date): |
| 124 | + """Process book borrowing.""" |
| 125 | + member = self.get_member(member_id) |
| 126 | + book = self.get_book(isbn) |
| 127 | + |
| 128 | + if not member.is_active: |
| 129 | + raise MaxBooksExceededError("Member account is suspended") |
| 130 | + |
| 131 | + if not book.is_available(): |
| 132 | + raise BookNotAvailableError(f"Book '{book.title}' is not available") |
| 133 | + |
| 134 | + if not member.can_borrow(): |
| 135 | + raise MaxBooksExceededError("Member has reached maximum borrowed books limit") |
| 136 | + |
| 137 | + book.borrow(member_id, date) |
| 138 | + member.borrow_book(isbn, date) |
| 139 | + |
| 140 | + self.transaction_history.append({ |
| 141 | + 'type': 'borrow', |
| 142 | + 'member_id': member_id, |
| 143 | + 'isbn': isbn, |
| 144 | + 'date': date |
| 145 | + }) |
| 146 | + |
| 147 | + return f"Book '{book.title}' borrowed by {member.name}" |
| 148 | + |
| 149 | + def return_book(self, member_id, isbn, return_date): |
| 150 | + """Process book return.""" |
| 151 | + member = self.get_member(member_id) |
| 152 | + book = self.get_book(isbn) |
| 153 | + |
| 154 | + if isbn not in member.borrowed_books: |
| 155 | + return "This book was not borrowed by this member" |
| 156 | + |
| 157 | + # Calculate and add fine if overdue |
| 158 | + fine = member.calculate_fine(isbn, return_date) |
| 159 | + if fine > 0: |
| 160 | + member.add_fine(fine) |
| 161 | + |
| 162 | + book.return_book(member_id) |
| 163 | + member.return_book(isbn) |
| 164 | + |
| 165 | + self.transaction_history.append({ |
| 166 | + 'type': 'return', |
| 167 | + 'member_id': member_id, |
| 168 | + 'isbn': isbn, |
| 169 | + 'date': return_date, |
| 170 | + 'fine': fine |
| 171 | + }) |
| 172 | + |
| 173 | + return f"Book '{book.title}' returned. Fine: ${fine:.2f}" |
| 174 | + |
| 175 | + # Statistics |
| 176 | + def get_most_borrowed_books(self, limit=5): |
| 177 | + """Get most borrowed books.""" |
| 178 | + books_with_count = [(book, len(book.borrowed_by)) for book in self.books.values()] |
| 179 | + books_with_count.sort(key=lambda x: x[1], reverse=True) |
| 180 | + return [book for book, _ in books_with_count[:limit]] |
| 181 | + |
| 182 | + def get_members_with_fines(self): |
| 183 | + """Get all members who have outstanding fines.""" |
| 184 | + return [member for member in self.members.values() if member.fine_amount > 0] |
| 185 | + |
| 186 | + def get_overdue_books(self): |
| 187 | + """Get all overdue books.""" |
| 188 | + from datetime import datetime, timedelta |
| 189 | + overdue = [] |
| 190 | + |
| 191 | + for member in self.members.values(): |
| 192 | + for isbn, borrow_date in member.borrowed_books.items(): |
| 193 | + borrow_datetime = datetime.strptime(borrow_date, '%Y-%m-%d') |
| 194 | + due_date = borrow_datetime + timedelta(days=Member.LOAN_PERIOD_DAYS) |
| 195 | + if datetime.now() > due_date: |
| 196 | + overdue.append({ |
| 197 | + 'member': member, |
| 198 | + 'book': self.books[isbn], |
| 199 | + 'due_date': due_date.strftime('%Y-%m-%d') |
| 200 | + }) |
| 201 | + |
| 202 | + return overdue |
| 203 | + |
| 204 | + def get_statistics(self): |
| 205 | + """Get library statistics.""" |
| 206 | + return { |
| 207 | + 'total_books': len(self.books), |
| 208 | + 'total_copies': self.get_total_books_count(), |
| 209 | + 'available_copies': self.get_available_books_count(), |
| 210 | + 'borrowed_copies': self.get_total_books_count() - self.get_available_books_count(), |
| 211 | + 'total_members': len(self.members), |
| 212 | + 'active_members': len([m for m in self.members.values() if m.is_active]), |
| 213 | + 'members_with_fines': len(self.get_members_with_fines()), |
| 214 | + 'total_transactions': len(self.transaction_history) |
| 215 | + } |
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