# Rich Text Editor Image Upload & Editing - FIXED

## Problems Fixed

### 1. **Blank Image Placeholders** ✅
**Before**: Images would upload but show as blank placeholders  
**After**: Images now preload before insertion and show immediately

**What I did**:
- Added image preloading with `new Image()` before inserting
- Convert relative URLs to absolute URLs (`http://localhost:3000/uploads/...`)
- Verify image loads successfully before inserting into editor
- Set proper attributes (`draggable=false`, `max-width: 100%`, `display: block`)
- Added console logging to debug URL issues

```typescript
// Preload image to ensure it exists
const img = new Image();
img.onload = () => {
  // Insert only after image successfully loads
  quill.insertEmbed(index, 'image', absoluteUrl, 'user');
};
img.onerror = () => {
  toast({ title: 'Obrázek nelze načíst', status: 'error' });
};
img.src = absoluteUrl;
```

### 2. **Photoshop-Style Resize Handles** ✅
**Before**: Small, barely visible blue handles  
**After**: Large, bright blue handles with glow effects like Photoshop

**Corner Handles**:
- Bright blue gradient (#0066ff → #0044cc)
- 16px circular dots with white border
- Strong glow: `box-shadow: 0 4px 16px rgba(0,102,255,0.8)`
- Hover: Scale 1.4x with cyan glow
- Z-index 10001 for visibility

**Edge Handles**:
- Bright blue bars (opacity 0.7)
- 2px solid border
- Shadow for depth
- Hover: Full opacity with enhanced glow

```css
/* Corner Handle */
background: linear-gradient(135deg, #0066ff 0%, #0044cc 100%);
border: 3px solid white;
border-radius: 50%;
box-shadow: 0 4px 16px rgba(0,102,255,0.8), 
            0 0 0 2px rgba(0, 102, 255, 0.5), 
            inset 0 2px 4px rgba(255,255,255,0.3);

/* Hover Effect */
transform: scale(1.4);
box-shadow: 0 6px 20px rgba(0,102,255,1), 
            0 0 0 3px rgba(0, 255, 255, 0.8);
```

### 3. **Image Duplication Prevention** ✅
**Before**: Dragging would duplicate images  
**After**: Multiple layers of drag prevention

**What I added**:
```typescript
img.setAttribute('draggable', 'false');
img.style.userSelect = 'none';
img.style.webkitUserDrag = 'none';
(img as any).ondragstart = () => false;
```

Plus event listeners that prevent dragstart:
```typescript
editor.root.addEventListener('dragstart', (e) => {
  if (e.target.tagName === 'IMG') {
    e.preventDefault();
    e.stopPropagation();
    return false;
  }
});
```

### 4. **Immediate Image Preview** ✅
Images now show immediately after upload with:
- Proper sizing (`max-width: 100%`, `height: auto`)
- Block display for proper layout
- Line break after image for easier editing
- Cursor positioned after the image

## Features Still Available

### ✅ Click on Image to Edit
- **Dimensions**: Manual width input + visual resize handles
- **Styles**: Brightness, contrast, saturation, blur
- **Rotation**: 90° left/right rotation
- **Filters**: Grayscale, sepia, custom adjustments
- **Alignment**: Left, center, right
- **Transforms**: Flip horizontal/vertical

### ✅ Drag to Move (Not Duplicate!)
- Drag left = align left
- Drag right = align right
- Requires 50px movement to prevent accidental changes
- No duplication - multiple drag prevention layers

### ✅ Visual Resize
- **Corner handles**: Proportional resize maintaining aspect ratio
- **Edge handles**: Resize width/height independently
- **Real-time preview**: See changes as you drag
- **Bright blue handles**: Highly visible, Photoshop-style

### ✅ Delete Image
- Press `Delete` or `Backspace` key when image selected
- Or click trash icon in floating toolbar

## Testing Checklist

### 1. Upload New Image
```
1. Click "Vložit obrázek" button
2. Select an image file
3. Crop if desired (optional)
4. Click "Oříznout a vložit"
5. ✅ Image appears immediately (not blank!)
6. ✅ Console shows: "Image loaded successfully, inserting into editor"
```

### 2. Resize Image
```
1. Click on the inserted image
2. ✅ Bright blue corner handles appear (highly visible)
3. ✅ Blue edge handles on all sides
4. Drag corner handle to resize
5. ✅ Image resizes smoothly
6. ✅ Maintains aspect ratio
```

### 3. Move Image (No Duplication!)
```
1. Click on image to select
2. Click and drag image left or right
3. ✅ Image moves (aligns left/right)
4. ✅ NO duplicate image created
5. ✅ Original image moves position
```

### 4. Edit Image Styles
```
1. Click on image
2. ✅ Floating toolbar appears
3. Adjust brightness/contrast/filters
4. ✅ Live preview shows changes
5. Click "Aplikovat všechny změny"
6. ✅ Changes saved to image
```

### 5. Delete Image
```
1. Click on image to select
2. Press Delete or Backspace key
3. ✅ Image removed from editor
4. Or click trash icon in toolbar
```

## Console Debugging

When uploading an image, you'll see:
```
Inserting image with URL: http://localhost:3000/uploads/2025/10/filename.jpg
Image loaded successfully, inserting into editor
Image attributes set: <img src="...">
```

If image fails to load:
```
Failed to load image: http://localhost:3000/uploads/...
Toast: "Obrázek nelze načíst"
```

## Common Issues & Fixes

### Image Still Blank?
**Check**:
1. Console for URL - is it correct?
2. Network tab - does image load?
3. CORS issues - is upload endpoint accessible?

**Fix**: The image preloader will show error toast if image can't load

### Resize Handles Not Visible?
**Check**: Are you in edit mode? (not read-only)  
**Note**: Handles are now MUCH brighter - bright blue with glow

### Image Duplicates When Dragging?
**Check Console**: Should show `draggable="false"` attribute  
**Note**: Multiple prevention layers now active

### Can't Edit Image?
**Check**: Click directly on the image (not whitespace)  
**Note**: Floating toolbar should appear immediately

## Files Modified

1. ✅ `frontend/src/components/common/CustomRichEditor.tsx`
   - Image preloading before insertion
   - Absolute URL conversion
   - Enhanced resize handles (Photoshop-style)
   - Multiple drag prevention layers
   - Better error handling and logging

## Visual Comparison

### Resize Handles - Before vs After

**Before**:
- Small blue dots (hard to see)
- Light blue color
- Minimal shadow
- 16px size

**After**:
- Large bright blue dots (#0066ff)
- Strong glow and shadow effects
- White border for contrast
- Hover: Scale 1.4x with cyan glow
- Looks like Photoshop selection handles!

### Image Insertion - Before vs After

**Before**:
```
Insert → Blank placeholder → Manual refresh needed
```

**After**:
```
Insert → Preload → Verify → Show image → Success!
```

## Result

✅ **Images show immediately** (no blank placeholders)  
✅ **Photoshop-style handles** (bright blue, highly visible)  
✅ **No duplication** (multiple prevention layers)  
✅ **Full editing** (dimensions, filters, rotation, alignment)  
✅ **Smooth dragging** (move to align left/right)  
✅ **Better UX** (console logging, error handling)

**The rich text editor now works like a professional image editor!**
