# Custom Instructions Integration Fix

**Date**: 2025-10-17  
**Version**: v3.6.2-beta → v3.6.3-beta (pending)

## Problem Identified

Custom Instructions feature appeared to work in the UI but **was not actually integrated into the translation workflow**.

### Root Cause

1. **Activation worked**: Clicking "✅ Use in Current Project" correctly stored the Custom Instruction in `self.active_custom_instruction`
2. **Display worked**: Active label showed the Custom Instruction name
3. **Integration MISSING**: The `get_context_aware_prompt()` method (line 738) never checked for or appended `self.active_custom_instruction` to the system prompt
4. **Result**: Custom Instructions were stored but never sent to the AI

## Changes Made

### 1. Fixed `get_context_aware_prompt()` Method (Line 738)

**Before**:
```python
def get_context_aware_prompt(self, mode: str = "single") -> str:
    """Get the appropriate translation prompt based on context."""
    # If user has selected a custom prompt, use that
    if hasattr(self, 'current_translate_prompt') and self.current_translate_prompt != self.single_segment_prompt:
        return self.current_translate_prompt
    
    # Otherwise, select based on mode
    if mode == "single":
        return self.single_segment_prompt
    elif mode == "batch_docx":
        return self.batch_docx_prompt
    # ... etc
```

**After**:
```python
def get_context_aware_prompt(self, mode: str = "single") -> str:
    """Get the appropriate translation prompt based on context.
    
    Returns:
        The appropriate prompt template for the given context, with Custom Instructions appended if active
    """
    # Determine base prompt
    base_prompt = None
    
    # If user has selected a custom prompt, use that
    if hasattr(self, 'current_translate_prompt') and self.current_translate_prompt != self.single_segment_prompt:
        base_prompt = self.current_translate_prompt
    else:
        # Otherwise, select based on mode
        if mode == "single":
            base_prompt = self.single_segment_prompt
        elif mode == "batch_docx":
            base_prompt = self.batch_docx_prompt
        elif mode == "batch_bilingual":
            base_prompt = self.batch_bilingual_prompt
        else:
            base_prompt = self.single_segment_prompt  # Default fallback
    
    # Append Custom Instructions if active
    if hasattr(self, 'active_custom_instruction') and self.active_custom_instruction:
        combined_prompt = base_prompt + "\n\n" + "**CUSTOM INSTRUCTIONS:**\n" + self.active_custom_instruction
        return combined_prompt
    
    return base_prompt
```

**Key Changes**:
- Now checks for `self.active_custom_instruction`
- Appends Custom Instructions to base prompt with clear header
- Returns combined prompt that includes both System Prompt and Custom Instructions

### 2. Added "Clear" Button (Line ~2505)

**Before**:
- Only had "✅ Use in Current Project" button
- No way to deactivate a Custom Instruction once set

**After**:
```python
tk.Button(custom_btn_frame, text="✅ Use in Current Project",
         command=self._pl_activate_custom_instruction,
         bg='#4CAF50', fg='white', font=('Segoe UI', 9, 'bold')).pack(side='left', padx=5)
tk.Button(custom_btn_frame, text="✖ Clear",
         command=self._pl_clear_custom_instruction,
         bg='#f44336', fg='white', font=('Segoe UI', 9)).pack(side='left', padx=5)
```

### 3. Implemented Clear Functionality (Line ~2792)

```python
def _pl_clear_custom_instruction(self):
    """Clear the active custom instruction"""
    if not hasattr(self, 'active_custom_instruction') or not self.active_custom_instruction:
        messagebox.showinfo("No Active Custom Instruction", "No Custom Instruction is currently active.")
        return
    
    # Clear the active custom instruction
    self.active_custom_instruction = None
    self.active_custom_instruction_name = None
    
    # Update label
    if hasattr(self, 'pl_active_custom_label'):
        self.pl_active_custom_label.config(text='None')
    
    self.log("✖ Cleared Custom Instruction")
    messagebox.showinfo("Cleared", "Custom Instruction has been cleared.")
```

## How Custom Instructions Now Work

### Activation Flow

1. User opens **Prompt Library** tab
2. Selects **Custom Instructions** sub-tab
3. Clicks on a Custom Instruction to view it
4. Clicks **"✅ Use in Current Project"**
5. Custom Instruction is stored in `self.active_custom_instruction`
6. Label updates: `Custom instructions: [Name]`

### Translation Integration

When translating a segment:

1. `translate_segment()` calls `get_context_aware_prompt(mode="single")`
2. `get_context_aware_prompt()` builds the prompt:
   - Gets base System Prompt (Default or activated)
   - Checks for `self.active_custom_instruction`
   - If active, appends: `"\n\n**CUSTOM INSTRUCTIONS:**\n" + content`
3. Combined prompt is sent to AI with both System Prompt and Custom Instructions

### Example Combined Prompt

```
You are an expert English to Dutch translator with deep understanding of context...
[Full System Prompt content]

**CUSTOM INSTRUCTIONS:**
## Style Guidelines
- Use formal tone (U-form instead of je-form)
- Preserve technical terminology in English
- Adapt cultural references for Dutch audience

## Specific Terms
- "API" → Keep in English
- "Cloud computing" → "cloudcomputing" (no space)
```

### Deactivation Flow

1. User clicks **"✖ Clear"** button
2. Custom Instruction is cleared (`self.active_custom_instruction = None`)
3. Label updates: `Custom instructions: None`
4. Translations now use only System Prompt (no Custom Instructions appended)

## Testing Checklist

- [ ] Activate a System Prompt for Translation
- [ ] Activate a Custom Instruction
- [ ] Verify active bar shows both: `Translation system prompt: [Name] | Custom instructions: [Name]`
- [ ] Import a document and translate a segment
- [ ] Check AI output to verify Custom Instructions were followed
- [ ] Use "Show Prompt" feature to see the actual prompt sent to AI
- [ ] Click "✖ Clear" button
- [ ] Verify label updates to "None"
- [ ] Translate another segment to confirm Custom Instructions no longer applied
- [ ] Check session report shows correct prompt configuration

## Impact

**Before**: Custom Instructions UI was non-functional (stored but never used)  
**After**: Custom Instructions fully integrated into translation workflow

**User Benefit**: Users can now:
- Define project-specific rules (tone, terminology, style)
- Activate them with one click
- Have them automatically applied to all translations
- Clear them when switching projects
- See what's active at all times

## Next Steps

1. **Version Bump**: Update to v3.6.3-beta
2. **Documentation**: Update CHANGELOG and user guides
3. **Testing**: Full integration testing with actual translation workflow
4. **Session Reports**: Verify Custom Instructions are shown in reports
5. **Show Prompt**: Test that "Show Prompt" displays combined prompt correctly
