Refactor code structure for improved readability and maintainability

SPADKI_INTEGRATION_SUMMARY.md

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+# Power System Designer - Integration Summary
+
+## ✅ **Fixes and Improvements Implemented**
+
+### **1. Fixed Object Selection**
+- **Issue**: Selection tool didn't work properly
+- **Fix**: 
+  - Implemented proper `findObjectAt()` function with correct hit detection
+  - Added visual feedback for selected objects (blue glow)
+  - Improved click detection accuracy with 20px radius
+
+### **2. Added Object Dragging**
+- **Issue**: Objects couldn't be moved
+- **Fix**:
+  - Implemented `handleCanvasMouseDown`, `handleCanvasMouseMove`, and `handleCanvasMouseUp` event handlers
+  - Added drag state management with `isDragging` and `dragOffset`
+  - Objects snap to 20px grid while dragging
+  - Visual feedback during dragging operations
+
+### **3. Fixed Cable Connection Tool**
+- **Issue**: Cable connection tool didn't work at all
+- **Fix**:
+  - Proper two-click connection workflow
+  - Visual feedback showing selected connection source (orange highlight)
+  - Connection status indicator overlay
+  - Automatic cable length calculation based on object positions
+  - Prevention of duplicate connections and self-connections
+  - Error messages for invalid connections
+
+### **4. Enhanced Object Data Structure**
+- **Issue**: Objects didn't have all necessary information
+- **Fix**:
+  - Added comprehensive object properties:
+    - `typeDescription` - Custom type descriptions
+    - `load` - Current load vs rated power
+    - `voltage` - Operating voltage
+    - `current` - Current flow (for calculations)
+    - Position tracking (`x`, `y`)
+    - Proper default values for each object type
+
+### **5. Improved Cable Data Structure**
+- **Enhanced Cable Properties**:
+  - `resistance` - Electrical resistance based on cable type/size
+  - Better cable type handling (underground vs overhead)
+  - Automatic resistance calculation
+  - Improved cable length calculation
+
+### **6. Enhanced User Interface**
+
+#### **Object Properties Panel**:
+- Object type indicator with ID
+- Position display (X, Y coordinates)
+- Type-specific property fields
+- Enhanced transformer properties (primary/secondary voltage, power rating)
+- Load vs power rating for distribution points
+- Custom type descriptions
+
+#### **Cable Properties Panel**:
+- Connection source/destination display
+- Electrical parameters (resistance, installation type)
+- Cable type selection with proper underground/overhead distinction
+- Cross-section selection with standard sizes
+- Delete cable functionality
+
+#### **Visual Improvements**:
+- Better object highlighting (selected vs connection source)
+- Improved cable rendering with proper colors:
+  - Purple: Underground cables (YAKY, NA2XY-J)
+  - Orange: Overhead cables (AL, AsXSn)
+  - Dashed lines for overhead cables
+- Cable labels with background for better readability
+- Connection status indicator overlay
+
+### **7. Added Interaction Features**
+
+#### **Mouse Controls**:
+- **Left Click**: Select/place objects
+- **Drag**: Move selected objects (with grid snapping)
+- **Connect Mode**: Two-click cable connection workflow
+
+#### **Keyboard Shortcuts**:
+- **Delete/Backspace**: Delete selected object or cable
+- **Escape**: Clear selection and return to select mode
+
+#### **Object Management**:
+- Delete objects (with automatic cable cleanup)
+- Delete cables individually
+- Proper state management for selections
+
+### **8. Error Handling and Validation**
+- Transformer limit enforcement (only one allowed)
+- Duplicate connection prevention
+- Self-connection prevention
+- Error messages with clear descriptions
+- Input validation for numeric fields
+
+### **9. Technical Improvements**
+
+#### **Event System**:
+- Proper mouse event handling with coordinate transformation
+- Grid snapping for precise placement
+- Drag offset calculation for smooth object movement
+
+#### **State Management**:
+- Clean separation of object and cable selections
+- Proper state updates with React patterns
+- Automatic re-rendering on state changes
+
+#### **Performance**:
+- Efficient hit detection algorithms
+- Optimized canvas rendering
+- Proper event listener cleanup
+
+## **🎯 Key Features Now Working**
+
+1. **✅ Object Selection**: Click objects to select and edit properties
+2. **✅ Object Movement**: Drag objects to new positions with grid snapping
+3. **✅ Cable Connections**: Two-click workflow to connect objects
+4. **✅ Property Editing**: Comprehensive property panels for all object types
+5. **✅ Visual Feedback**: Clear indication of selected items and connection states
+6. **✅ Delete Functions**: Remove objects and cables with keyboard shortcuts
+7. **✅ Data Persistence**: Export/import with complete object data
+8. **✅ Electrical Calculations**: Ready for voltage drop analysis
+
+## **🔧 Usage Instructions**
+
+### **Adding Objects**:
+1. Click object type button in toolbar (Transformer, Box, Pole, End Connection)
+2. Click on canvas to place object
+3. Object automatically snaps to grid
+
+### **Selecting and Moving**:
+1. Click "Wybierz" (Select) tool
+2. Click object to select (blue highlight appears)
+3. Drag selected object to move (snaps to grid)
+
+### **Connecting with Cables**:
+1. Click "Połącz kablem" (Connect with Cable) tool
+2. Click first object (orange highlight appears)
+3. Click second object to create cable connection
+4. Cable appears with automatic length calculation
+
+### **Editing Properties**:
+1. Select object or cable
+2. Use properties panel on right to edit all parameters
+3. Changes are saved automatically
+
+### **Deleting Items**:
+1. Select object or cable
+2. Press Delete/Backspace key, OR
+3. Use "Usuń" (Delete) button in properties panel
+
+The power system designer is now fully functional with professional-grade features for electrical system design and analysis!