From 95d784fb414c6270e560fc0cf7ed289765ddd3ab Mon Sep 17 00:00:00 2001
From: matin <matin.kaufmann@gmail.com>
Date: Fri, 12 Sep 2025 20:45:28 +0200
Subject: AI refactoring (see architecture analysis and refactoring_summary)

---
 file_service.py | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 file_service.py

(limited to 'file_service.py')

diff --git a/file_service.py b/file_service.py
new file mode 100644
index 0000000..a8de2c0
--- /dev/null
+++ b/file_service.py
@@ -0,0 +1,105 @@
+# 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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