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# file_service.py
import json
import os
from typing import List, Dict, Any
from calendar_entry import CalendarEntry
from config import EventConfig
class FileService:
"""Centralized file operations with error handling"""
@staticmethod
def save_calendar_to_file(entries: List[CalendarEntry], filename: str) -> bool:
"""Save calendar entries to a JSON file"""
try:
# Ensure directory exists
os.makedirs(os.path.dirname(filename) if os.path.dirname(filename) else '.', exist_ok=True)
# Convert entries to dictionaries
data = [entry.to_dict() for entry in entries]
# Write to file
with open(filename, 'w', encoding='utf-8') as f:
json.dump(data, f, indent=4, ensure_ascii=False)
return True
except Exception as e:
print(f"Error saving calendar to file {filename}: {e}")
return False
@staticmethod
def load_calendar_from_file(filename: str) -> List[CalendarEntry]:
"""Load calendar entries from a JSON file"""
try:
if not os.path.exists(filename):
print(f"File {filename} does not exist")
return []
with open(filename, 'r', encoding='utf-8') as f:
data = json.load(f)
# Convert dictionaries to CalendarEntry objects
entries = []
for entry_data in data:
try:
entry = CalendarEntry.from_dict(entry_data)
entries.append(entry)
except Exception as e:
print(f"Error parsing entry: {e}")
continue
return entries
except (FileNotFoundError, json.JSONDecodeError) as e:
print(f"Error loading calendar from file {filename}: {e}")
return []
except Exception as e:
print(f"Unexpected error loading calendar from file {filename}: {e}")
return []
@staticmethod
def validate_file_extension(filename: str) -> bool:
"""Validate that file has correct extension"""
if not filename:
return False
# Add extension if missing
if not filename.endswith(EventConfig.DEFAULT_FILE_EXTENSION):
filename += EventConfig.DEFAULT_FILE_EXTENSION
return True
@staticmethod
def ensure_json_extension(filename: str) -> str:
"""Ensure filename has .json extension"""
if not filename.endswith(EventConfig.DEFAULT_FILE_EXTENSION):
return filename + EventConfig.DEFAULT_FILE_EXTENSION
return filename
@staticmethod
def file_exists(filename: str) -> bool:
"""Check if file exists"""
return os.path.exists(filename)
@staticmethod
def get_file_size(filename: str) -> int:
"""Get file size in bytes"""
try:
return os.path.getsize(filename)
except OSError:
return 0
@staticmethod
def backup_file(filename: str) -> str:
"""Create a backup of the file"""
if not os.path.exists(filename):
return filename
backup_filename = filename.replace('.json', '_backup.json')
try:
with open(filename, 'r', encoding='utf-8') as src:
with open(backup_filename, 'w', encoding='utf-8') as dst:
dst.write(src.read())
return backup_filename
except Exception as e:
print(f"Error creating backup: {e}")
return filename
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