# IGNY8 AI Functions - Complete Technical Reference
**Date:** December 3, 2025  
**Version:** 2.0 - CORRECTED AFTER AUTOMATION AUDIT  
**100% Based on Actual Codebase (Backend + Frontend + Automation Integration)**

---

## Table of Contents
1. [Overview](#overview)
2. [AI Architecture](#ai-architecture)
3. [AI Function Registry](#ai-function-registry)
4. [Planner Module AI Functions](#planner-module-ai-functions)
5. [Writer Module AI Functions](#writer-module-ai-functions)
6. [AI Function Base Class](#ai-function-base-class)
7. [AI Engine & Execution](#ai-engine--execution)
8. [Credit System Integration](#credit-system-integration)
9. [Progress Tracking](#progress-tracking)

---

## Overview

IGNY8 uses a centralized AI function architecture where all AI operations inherit from `BaseAIFunction` and execute through `AIEngine`. This ensures consistent:
- Credit management
- Progress tracking
- Error handling
- Logging
- Response parsing

**Total AI Functions: 6**

| Function | Module | Purpose | Input | Output | Credits |
|----------|--------|---------|-------|--------|---------|
| `auto_cluster` | Planner | Group keywords into semantic clusters | Keyword IDs | Clusters created | ~1 per 5 keywords |
| `generate_ideas` | Planner | Generate content ideas from clusters | Cluster IDs | Ideas created | 2 per cluster |
| `generate_content` | Writer | Generate article content from tasks | Task IDs | Content drafts | ~5 per 2500 words |
| `generate_image_prompts` | Writer | Extract image prompts from content | Content IDs | Image records with prompts | ~2 per content |
| `generate_images` | Writer | Generate actual images from prompts | Image IDs | Image URLs | 1-4 per image |
| `optimize_content` | Writer | SEO optimization of content | Content IDs | Updated content | ~1 per content |

---

## AI Architecture

### Directory Structure

```
backend/igny8_core/ai/
├── __init__.py
├── base.py                    # BaseAIFunction (abstract class)
├── engine.py                  # AIEngine (execution orchestrator)
├── registry.py                # Function registration & lazy loading
├── ai_core.py                 # Core AI API interactions
├── prompts.py                 # PromptRegistry
├── tasks.py                   # Celery tasks for async execution
├── models.py                  # AITaskLog, AIUsageLog
├── validators.py              # Input validation helpers
├── settings.py                # AI configuration
├── tracker.py                 # ProgressTracker, StepTracker
└── functions/
    ├── __init__.py
    ├── auto_cluster.py        # AutoClusterFunction
    ├── generate_ideas.py      # GenerateIdeasFunction
    ├── generate_content.py    # GenerateContentFunction
    ├── generate_image_prompts.py  # GenerateImagePromptsFunction
    ├── generate_images.py     # GenerateImagesFunction
    └── optimize_content.py    # OptimizeContentFunction
```

### Execution Flow

```
User Action → API Endpoint → Service Layer → AIEngine.execute()
                                                    ↓
                                            BaseAIFunction
                                                    ↓
                                ┌───────────────────┴───────────────────┐
                                ↓                                       ↓
                        Synchronous (small ops)              Async (Celery task)
                                ↓                                       ↓
                    Direct function execution              run_ai_task.delay()
                                ↓                                       ↓
                    INIT → PREP → AI_CALL → PARSE → SAVE → DONE
                                ↓
                    Credit deduction (automatic)
                                ↓
                    Progress tracking (StepTracker)
                                ↓
                    AIUsageLog created
```

---

## AI Function Registry

**File:** `backend/igny8_core/ai/registry.py`

### Lazy Loading System

Functions are registered with lazy loaders and only imported when called:

```python
_FUNCTION_REGISTRY: Dict[str, Type[BaseAIFunction]] = {}
_FUNCTION_LOADERS: Dict[str, callable] = {}

def get_function_instance(name: str) -> Optional[BaseAIFunction]:
    """Get function instance by name - lazy loads if needed"""
    actual_name = FUNCTION_ALIASES.get(name, name)
    fn_class = get_function(actual_name)
    if fn_class:
        return fn_class()
    return None
```

### Registered Functions

```python
# Lazy loaders
register_lazy_function('auto_cluster', _load_auto_cluster)
register_lazy_function('generate_ideas', _load_generate_ideas)
register_lazy_function('generate_content', _load_generate_content)
register_lazy_function('generate_images', _load_generate_images)
register_lazy_function('generate_image_prompts', _load_generate_image_prompts)
register_lazy_function('optimize_content', _load_optimize_content)
```

---

## Planner Module AI Functions

### 1. AutoClusterFunction

**File:** `backend/igny8_core/ai/functions/auto_cluster.py`

**Purpose:** Groups semantically related keywords into topic clusters using AI

**Class Definition:**
```python
class AutoClusterFunction(BaseAIFunction):
    def get_name(self) -> str:
        return 'auto_cluster'
```

**Metadata:**
```python
{
    'display_name': 'Auto Cluster Keywords',
    'description': 'Group related keywords into semantic clusters using AI',
    'phases': {
        'INIT': 'Initializing clustering...',
        'PREP': 'Loading keywords...',
        'AI_CALL': 'Analyzing keyword relationships...',
        'PARSE': 'Parsing cluster data...',
        'SAVE': 'Creating clusters...',
        'DONE': 'Clustering complete!'
    }
}
```

**Method: validate()**
```python
def validate(self, payload: dict, account=None) -> Dict:
    # Validates:
    # - IDs exist
    # - Keywords exist in database
    # - Account ownership
    # NO MAX LIMIT - processes any count
    return {'valid': True}
```

**Method: prepare()**
```python
def prepare(self, payload: dict, account=None) -> Dict:
    ids = payload.get('ids', [])
    sector_id = payload.get('sector_id')
    
    keywords = Keywords.objects.filter(id__in=ids, account=account).select_related(
        'account', 'site', 'sector', 'seed_keyword'
    )
    
    return {
        'keywords': keywords,  # Keyword objects
        'keyword_data': [      # Data for AI
            {
                'id': kw.id,
                'keyword': kw.keyword,  # From seed_keyword relationship
                'volume': kw.volume,
                'difficulty': kw.difficulty,
                'intent': kw.intent,
            }
            for kw in keywords
        ],
        'sector_id': sector_id
    }
```

**Method: build_prompt()**
```python
def build_prompt(self, data: Dict, account=None) -> str:
    keyword_data = data['keyword_data']
    
    # Format keywords for prompt
    keywords_text = '\n'.join([
        f"- {kw['keyword']} (Volume: {kw['volume']}, Difficulty: {kw['difficulty']}, Intent: {kw['intent']})"
        for kw in keyword_data
    ])
    
    # Get prompt template from registry
    prompt = PromptRegistry.get_prompt(
        function_name='auto_cluster',
        account=account,
        context={'KEYWORDS': keywords_text}
    )
    
    # Ensure JSON mode compatibility
    if 'json' not in prompt.lower():
        prompt += "\n\nIMPORTANT: You must respond with valid JSON only."
    
    return prompt
```

**Method: parse_response()**
```python
def parse_response(self, response: str, step_tracker=None) -> List[Dict]:
    # Try direct JSON parse
    try:
        json_data = json.loads(response.strip())
    except json.JSONDecodeError:
        # Fallback to extract_json (handles markdown code blocks)
        ai_core = AICore(account=self.account)
        json_data = ai_core.extract_json(response)
    
    # Extract clusters array
    if isinstance(json_data, dict):
        clusters = json_data.get('clusters', [])
    elif isinstance(json_data, list):
        clusters = json_data
    
    return clusters  # [{name, keywords: [], description}]
```

**Method: save_output()**
```python
def save_output(self, parsed: List[Dict], original_data: Dict, account=None, 
                progress_tracker=None, step_tracker=None) -> Dict:
    keywords = original_data['keywords']
    account = account or keywords[0].account
    site = keywords[0].site
    sector = keywords[0].sector
    
    clusters_created = 0
    keywords_updated = 0
    
    with transaction.atomic():
        for cluster_data in parsed:
            cluster_name = cluster_data.get('name', '')
            cluster_keywords = cluster_data.get('keywords', [])
            
            # Get or create cluster
            cluster, created = Clusters.objects.get_or_create(
                name=cluster_name,
                account=account,
                site=site,
                sector=sector,
                defaults={
                    'description': cluster_data.get('description', ''),
                    'status': 'active',
                }
            )
            
            if created:
                clusters_created += 1
            
            # Match keywords (case-insensitive)
            for keyword_obj in keywords:
                if keyword_obj.keyword.lower() in [k.lower() for k in cluster_keywords]:
                    keyword_obj.cluster = cluster
                    keyword_obj.status = 'mapped'
                    keyword_obj.save()
                    keywords_updated += 1
        
        # Recalculate cluster metrics
        for cluster in Clusters.objects.filter(account=account, site=site, sector=sector):
            cluster.keywords_count = Keywords.objects.filter(cluster=cluster).count()
            cluster.volume = Keywords.objects.filter(cluster=cluster).aggregate(
                total=Sum(Case(
                    When(volume_override__isnull=False, then=F('volume_override')),
                    default=F('seed_keyword__volume'),
                    output_field=IntegerField()
                ))
            )['total'] or 0
            cluster.save()
    
    return {
        'count': clusters_created,
        'clusters_created': clusters_created,
        'keywords_updated': keywords_updated
    }
```

**Service Integration:**
```python
# backend/igny8_core/business/planning/services/clustering_service.py
class ClusteringService:
    def cluster_keywords(self, keyword_ids, account, sector_id=None):
        from igny8_core.ai.tasks import run_ai_task
        
        payload = {'ids': keyword_ids, 'sector_id': sector_id}
        
        if hasattr(run_ai_task, 'delay'):
            # Async via Celery
            task = run_ai_task.delay(
                function_name='auto_cluster',
                payload=payload,
                account_id=account.id
            )
            return {'success': True, 'task_id': str(task.id)}
        else:
            # Sync execution
            result = run_ai_task(
                function_name='auto_cluster',
                payload=payload,
                account_id=account.id
            )
            return result
```

---

### 2. GenerateIdeasFunction

**File:** `backend/igny8_core/ai/functions/generate_ideas.py`

**Purpose:** Generate SEO-optimized content ideas from keyword clusters

**Class Definition:**
```python
class GenerateIdeasFunction(BaseAIFunction):
    def get_name(self) -> str:
        return 'generate_ideas'
    
    def get_max_items(self) -> int:
        return 10  # Max clusters per batch
```

**Metadata:**
```python
{
    'display_name': 'Generate Ideas',
    'description': 'Generate SEO-optimized content ideas from keyword clusters',
    'phases': {
        'INIT': 'Initializing idea generation...',
        'PREP': 'Loading clusters...',
        'AI_CALL': 'Generating ideas with AI...',
        'PARSE': 'Parsing idea data...',
        'SAVE': 'Saving ideas...',
        'DONE': 'Ideas generated!'
    }
}
```

**Method: prepare()**
```python
def prepare(self, payload: dict, account=None) -> Dict:
    cluster_ids = payload.get('ids', [])
    
    clusters = Clusters.objects.filter(id__in=cluster_ids, account=account).select_related(
        'sector', 'account', 'site'
    ).prefetch_related('keywords')
    
    cluster_data = []
    for cluster in clusters:
        # Get keywords from Keywords model (via seed_keyword relationship)
        keyword_objects = Keywords.objects.filter(cluster=cluster).select_related('seed_keyword')
        keywords = [kw.seed_keyword.keyword for kw in keyword_objects if kw.seed_keyword]
        
        cluster_data.append({
            'id': cluster.id,
            'name': cluster.name,
            'description': cluster.description or '',
            'keywords': keywords,
        })
    
    return {
        'clusters': clusters,
        'cluster_data': cluster_data,
        'account': account or clusters[0].account
    }
```

**Method: build_prompt()**
```python
def build_prompt(self, data: Dict, account=None) -> str:
    cluster_data = data['cluster_data']
    
    clusters_text = '\n'.join([
        f"Cluster ID: {c['id']} | Name: {c['name']} | Description: {c.get('description', '')}"
        for c in cluster_data
    ])
    
    cluster_keywords_text = '\n'.join([
        f"Cluster ID: {c['id']} | Name: {c['name']} | Keywords: {', '.join(c.get('keywords', []))}"
        for c in cluster_data
    ])
    
    prompt = PromptRegistry.get_prompt(
        function_name='generate_ideas',
        account=account or data['account'],
        context={
            'CLUSTERS': clusters_text,
            'CLUSTER_KEYWORDS': cluster_keywords_text,
        }
    )
    
    return prompt
```

**Method: parse_response()**
```python
def parse_response(self, response: str, step_tracker=None) -> List[Dict]:
    ai_core = AICore(account=self.account)
    json_data = ai_core.extract_json(response)
    
    if not json_data or 'ideas' not in json_data:
        raise ValueError(f"Failed to parse ideas response")
    
    return json_data.get('ideas', [])
    # Expected format: [{title, description, cluster_id, content_type, content_structure, ...}]
```

**Method: save_output()**
```python
def save_output(self, parsed: List[Dict], original_data: Dict, account=None,
                progress_tracker=None, step_tracker=None) -> Dict:
    clusters = original_data['clusters']
    account = account or original_data['account']
    
    ideas_created = 0
    
    with transaction.atomic():
        for idea_data in parsed:
            # Match cluster by ID or name
            cluster = None
            cluster_id_from_ai = idea_data.get('cluster_id')
            cluster_name = idea_data.get('cluster_name', '')
            
            if cluster_id_from_ai:
                cluster = next((c for c in clusters if c.id == cluster_id_from_ai), None)
            
            if not cluster and cluster_name:
                cluster = next((c for c in clusters if c.name == cluster_name), None)
            
            if not cluster:
                continue
            
            site = cluster.site or (cluster.sector.site if cluster.sector else None)
            
            # Handle description (might be dict or string)
            description = idea_data.get('description', '')
            if isinstance(description, dict):
                description = json.dumps(description)
            
            # Create ContentIdeas record
            ContentIdeas.objects.create(
                idea_title=idea_data.get('title', 'Untitled Idea'),
                description=description,
                content_type=idea_data.get('content_type', 'post'),
                content_structure=idea_data.get('content_structure', 'article'),
                target_keywords=idea_data.get('covered_keywords', '') or idea_data.get('target_keywords', ''),
                keyword_cluster=cluster,
                estimated_word_count=idea_data.get('estimated_word_count', 1500),
                status='new',
                account=account,
                site=site,
                sector=cluster.sector,
            )
            ideas_created += 1
            
            # Update cluster status
            if cluster.status == 'new':
                cluster.status = 'mapped'
                cluster.save()
    
    return {
        'count': ideas_created,
        'ideas_created': ideas_created
    }
```

**Service Integration:**
```python
# backend/igny8_core/business/planning/services/ideas_service.py
class IdeasService:
    def generate_ideas(self, cluster_ids, account):
        from igny8_core.ai.tasks import run_ai_task
        
        payload = {'ids': cluster_ids}
        
        if hasattr(run_ai_task, 'delay'):
            task = run_ai_task.delay(
                function_name='auto_generate_ideas',
                payload=payload,
                account_id=account.id
            )
            return {'success': True, 'task_id': str(task.id)}
        else:
            result = run_ai_task(
                function_name='auto_generate_ideas',
                payload=payload,
                account_id=account.id
            )
            return result
```

---

## Writer Module AI Functions

### 3. GenerateContentFunction

**File:** `backend/igny8_core/ai/functions/generate_content.py`

**Purpose:** Generate complete article content from task requirements

**Class Definition:**
```python
class GenerateContentFunction(BaseAIFunction):
    def get_name(self) -> str:
        return 'generate_content'
    
    def get_max_items(self) -> int:
        return 50  # Max tasks per batch
```

**Key Implementation Details:**

**Method: prepare()**
```python
def prepare(self, payload: dict, account=None) -> List:
    task_ids = payload.get('ids', [])
    
    tasks = Tasks.objects.filter(id__in=task_ids, account=account).select_related(
        'account', 'site', 'sector', 'cluster', 'taxonomy_term'
    )
    
    return list(tasks)
```

**Method: build_prompt()**
```python
def build_prompt(self, data: Any, account=None) -> str:
    task = data[0] if isinstance(data, list) else data
    
    # Build idea data
    idea_data = f"Title: {task.title or 'Untitled'}\n"
    if task.description:
        idea_data += f"Description: {task.description}\n"
    idea_data += f"Content Type: {task.content_type or 'post'}\n"
    idea_data += f"Content Structure: {task.content_structure or 'article'}\n"
    
    # Build cluster context
    cluster_data = ''
    if task.cluster:
        cluster_data = f"Cluster Name: {task.cluster.name}\n"
        if task.cluster.description:
            cluster_data += f"Description: {task.cluster.description}\n"
    
    # Build taxonomy context
    taxonomy_data = ''
    if task.taxonomy_term:
        taxonomy_data = f"Taxonomy: {task.taxonomy_term.name}\n"
        if task.taxonomy_term.taxonomy_type:
            taxonomy_data += f"Type: {task.taxonomy_term.get_taxonomy_type_display()}\n"
    
    # Build keywords
    keywords_data = ''
    if task.keywords:
        keywords_data = f"Keywords: {task.keywords}\n"
    
    prompt = PromptRegistry.get_prompt(
        function_name='generate_content',
        account=account or task.account,
        task=task,
        context={
            'IDEA': idea_data,
            'CLUSTER': cluster_data,
            'TAXONOMY': taxonomy_data,
            'KEYWORDS': keywords_data,
        }
    )
    
    return prompt
```

**Method: parse_response()**
```python
def parse_response(self, response: str, step_tracker=None) -> Dict:
    # Try JSON parse first
    try:
        parsed_json = json.loads(response.strip())
        if isinstance(parsed_json, dict):
            return parsed_json
    except (json.JSONDecodeError, ValueError):
        pass
    
    # Fallback: normalize plain HTML content
    try:
        from igny8_core.utils.content_normalizer import normalize_content
        normalized = normalize_content(response)
        return {'content': normalized['normalized_content']}
    except Exception:
        return {'content': response}
```

**Method: save_output() - CRITICAL WITH TAGS/CATEGORIES**
```python
def save_output(self, parsed: Any, original_data: Any, account=None,
                progress_tracker=None, step_tracker=None) -> Dict:
    task = original_data[0] if isinstance(original_data, list) else original_data
    
    # Extract fields from parsed response
    if isinstance(parsed, dict):
        content_html = parsed.get('content', '')
        title = parsed.get('title') or task.title
        meta_title = parsed.get('meta_title') or parsed.get('seo_title') or title
        meta_description = parsed.get('meta_description') or parsed.get('seo_description')
        primary_keyword = parsed.get('primary_keyword') or parsed.get('focus_keyword')
        secondary_keywords = parsed.get('secondary_keywords') or parsed.get('keywords', [])
        tags_from_response = parsed.get('tags', [])
        categories_from_response = parsed.get('categories', [])
    else:
        content_html = str(parsed)
        title = task.title
        # ... defaults
        tags_from_response = []
        categories_from_response = []
    
    # Calculate word count
    word_count = 0
    if content_html:
        text_for_counting = re.sub(r'<[^>]+>', '', content_html)
        word_count = len(text_for_counting.split())
    
    # Create Content record (independent, NOT OneToOne with Task)
    content_record = Content.objects.create(
        title=title,
        content_html=content_html,
        word_count=word_count,
        meta_title=meta_title,
        meta_description=meta_description,
        primary_keyword=primary_keyword,
        secondary_keywords=secondary_keywords if isinstance(secondary_keywords, list) else [],
        cluster=task.cluster,
        content_type=task.content_type,
        content_structure=task.content_structure,
        source='igny8',
        status='draft',
        account=task.account,
        site=task.site,
        sector=task.sector,
    )
    
    # Link taxonomy term from task
    if task.taxonomy_term:
        content_record.taxonomy_terms.add(task.taxonomy_term)
    
    # Process tags from AI response
    if tags_from_response and isinstance(tags_from_response, list):
        from django.utils.text import slugify
        for tag_name in tags_from_response:
            if tag_name and isinstance(tag_name, str):
                tag_name = tag_name.strip()
                if tag_name:
                    tag_slug = slugify(tag_name)
                    tag_obj, created = ContentTaxonomy.objects.get_or_create(
                        site=task.site,
                        slug=tag_slug,
                        taxonomy_type='tag',
                        defaults={
                            'name': tag_name,
                            'sector': task.sector,
                            'account': task.account,
                        }
                    )
                    content_record.taxonomy_terms.add(tag_obj)
    
    # Process categories from AI response
    if categories_from_response and isinstance(categories_from_response, list):
        from django.utils.text import slugify
        for category_name in categories_from_response:
            if category_name and isinstance(category_name, str):
                category_name = category_name.strip()
                if category_name:
                    category_slug = slugify(category_name)
                    category_obj, created = ContentTaxonomy.objects.get_or_create(
                        site=task.site,
                        slug=category_slug,
                        taxonomy_type='category',
                        defaults={
                            'name': category_name,
                            'sector': task.sector,
                            'account': task.account,
                        }
                    )
                    content_record.taxonomy_terms.add(category_obj)
    
    # Update task status
    task.status = 'completed'
    task.save(update_fields=['status', 'updated_at'])
    
    # Auto-sync idea status
    if hasattr(task, 'idea') and task.idea:
        task.idea.status = 'completed'
        task.idea.save(update_fields=['status', 'updated_at'])
    
    return {
        'count': 1,
        'content_id': content_record.id,
        'task_id': task.id,
        'word_count': word_count,
    }
```

---

### 4. GenerateImagePromptsFunction

**File:** `backend/igny8_core/ai/functions/generate_image_prompts.py`

**Purpose:** Extract detailed image generation prompts from content HTML

**Class Definition:**
```python
class GenerateImagePromptsFunction(BaseAIFunction):
    def get_name(self) -> str:
        return 'generate_image_prompts'
    
    def get_max_items(self) -> int:
        return 50  # Max content records per batch
```

**Method: prepare()**
```python
def prepare(self, payload: dict, account=None) -> List:
    content_ids = payload.get('ids', [])
    
    contents = Content.objects.filter(id__in=content_ids, account=account).select_related(
        'account', 'site', 'sector', 'cluster'
    )
    
    max_images = self._get_max_in_article_images(account)
    
    extracted_data = []
    for content in contents:
        extracted = self._extract_content_elements(content, max_images)
        extracted_data.append({
            'content': content,
            'extracted': extracted,
            'max_images': max_images,
        })
    
    return extracted_data
```

**Helper: _extract_content_elements()**
```python
def _extract_content_elements(self, content: Content, max_images: int) -> Dict:
    from bs4 import BeautifulSoup
    
    html_content = content.content_html or ''
    soup = BeautifulSoup(html_content, 'html.parser')
    
    # Extract title
    title = content.title or ''
    
    # Extract intro paragraphs (skip italic hook)
    paragraphs = soup.find_all('p')
    intro_paragraphs = []
    for p in paragraphs[:3]:
        text = p.get_text(strip=True)
        if len(text.split()) > 50:  # Real paragraph
            intro_paragraphs.append(text)
            if len(intro_paragraphs) >= 2:
                break
    
    # Extract H2 headings
    h2_tags = soup.find_all('h2')
    h2_headings = [h2.get_text(strip=True) for h2 in h2_tags[:max_images]]
    
    return {
        'title': title,
        'intro_paragraphs': intro_paragraphs,
        'h2_headings': h2_headings,
    }
```

**Method: save_output()**
```python
def save_output(self, parsed: Dict, original_data: Any, account=None,
                progress_tracker=None, step_tracker=None) -> Dict:
    data = original_data[0] if isinstance(original_data, list) else original_data
    content = data['content']
    max_images = data['max_images']
    
    prompts_created = 0
    
    with transaction.atomic():
        # Save featured image prompt
        Images.objects.update_or_create(
            content=content,
            image_type='featured',
            defaults={
                'prompt': parsed['featured_prompt'],
                'status': 'pending',
                'position': 0,
            }
        )
        prompts_created += 1
        
        # Save in-article image prompts
        in_article_prompts = parsed.get('in_article_prompts', [])
        for idx, prompt_text in enumerate(in_article_prompts[:max_images]):
            Images.objects.update_or_create(
                content=content,
                image_type='in_article',
                position=idx + 1,
                defaults={
                    'prompt': prompt_text,
                    'status': 'pending',
                }
            )
            prompts_created += 1
    
    return {
        'count': prompts_created,
        'prompts_created': prompts_created,
    }
```

---

### 5. GenerateImagesFunction

**File:** `backend/igny8_core/ai/functions/generate_images.py`

**Purpose:** Generate actual image URLs from Image records with prompts

**Note:** This function is partially implemented. The actual image generation happens via provider APIs.

---

## AI Function Base Class

**File:** `backend/igny8_core/ai/base.py`

All AI functions inherit from this abstract base:

```python
class BaseAIFunction(ABC):
    """Base class for all AI functions"""
    
    @abstractmethod
    def get_name(self) -> str:
        """Return function name (e.g., 'auto_cluster')"""
        pass
    
    def get_metadata(self) -> Dict:
        """Return function metadata (display name, description, phases)"""
        return {
            'display_name': self.get_name().replace('_', ' ').title(),
            'description': f'{self.get_name()} AI function',
            'phases': {
                'INIT': 'Initializing...',
                'PREP': 'Preparing data...',
                'AI_CALL': 'Processing with AI...',
                'PARSE': 'Parsing response...',
                'SAVE': 'Saving results...',
                'DONE': 'Complete!'
            }
        }
    
    def validate(self, payload: dict, account=None) -> Dict[str, Any]:
        """Validate input payload"""
        ids = payload.get('ids', [])
        if not ids:
            return {'valid': False, 'error': 'No IDs provided'}
        return {'valid': True}
    
    def get_max_items(self) -> Optional[int]:
        """Override to set max items limit"""
        return None
    
    @abstractmethod
    def prepare(self, payload: dict, account=None) -> Any:
        """Load and prepare data for AI processing"""
        pass
    
    @abstractmethod
    def build_prompt(self, data: Any, account=None) -> str:
        """Build AI prompt from prepared data"""
        pass
    
    def get_model(self, account=None) -> Optional[str]:
        """Override to specify model (defaults to account's default model)"""
        return None
    
    @abstractmethod
    def parse_response(self, response: str, step_tracker=None) -> Any:
        """Parse AI response into structured data"""
        pass
    
    @abstractmethod
    def save_output(self, parsed: Any, original_data: Any, account=None,
                    progress_tracker=None, step_tracker=None) -> Dict:
        """Save parsed results to database"""
        pass
```

---

## AI Engine & Execution

**File:** `backend/igny8_core/ai/engine.py`

The `AIEngine` orchestrates all AI function execution:

```python
class AIEngine:
    def __init__(self, account: Account):
        self.account = account
        self.ai_core = AICore(account=account)
    
    def execute(self, fn: BaseAIFunction, payload: dict) -> Dict:
        """
        Execute AI function with full orchestration:
        1. Validation
        2. Preparation
        3. AI call
        4. Response parsing
        5. Output saving
        6. Credit deduction (automatic)
        7. Progress tracking
        8. Logging
        """
        
        # Step 1: Validate
        validation = fn.validate(payload, self.account)
        if not validation['valid']:
            return {'success': False, 'error': validation['error']}
        
        # Step 2: Prepare data
        prepared_data = fn.prepare(payload, self.account)
        
        # Step 3: Build prompt
        prompt = fn.build_prompt(prepared_data, self.account)
        
        # Step 4: Call AI (via AICore)
        model = fn.get_model(self.account) or self._get_default_model()
        response = self.ai_core.run_ai_request(
            prompt=prompt,
            model=model,
            function_name=fn.get_name()
        )
        
        # Step 5: Parse response
        parsed = fn.parse_response(response['content'])
        
        # Step 6: Save output
        result = fn.save_output(parsed, prepared_data, self.account)
        
        # Step 7: Deduct credits (AUTOMATIC - line 395)
        CreditService.deduct_credits_for_operation(
            account=self.account,
            operation_type=self._get_operation_type(),
            amount=self._get_actual_amount(),
        )
        
        # Step 8: Log to AIUsageLog
        AIUsageLog.objects.create(
            account=self.account,
            function_name=fn.get_name(),
            credits_used=credits_deducted,
            # ... other fields
        )
        
        return {
            'success': True,
            **result
        }
```

**Key Point:** Credits are AUTOMATICALLY deducted by AIEngine. AI functions do NOT handle credits themselves.

---

## Credit System Integration

**Automatic Credit Deduction:**

All credit management happens in `AIEngine.execute()` at line 395:

```python
# backend/igny8_core/ai/engine.py line 395
CreditService.deduct_credits_for_operation(
    account=account,
    operation_type=self._get_operation_type(),
    amount=self._get_actual_amount(),
)
```

**AI Functions DO NOT:**
- Calculate credit costs
- Call `CreditService` manually
- Handle credit errors (handled by AIEngine)

**AI Functions ONLY:**
- Focus on their specific logic
- Return `{'count': N}` in `save_output()`
- AIEngine uses `count` to calculate credits

---

## Progress Tracking

**StepTracker & ProgressTracker:**

All AI functions emit progress events through trackers:

```python
# Phases emitted automatically by AIEngine
phases = {
    'INIT': 'Initializing...',           # 0-10%
    'PREP': 'Preparing data...',         # 10-20%
    'AI_CALL': 'Processing with AI...',  # 20-80%
    'PARSE': 'Parsing response...',      # 80-90%
    'SAVE': 'Saving results...',         # 90-100%
    'DONE': 'Complete!'                  # 100%
}
```

Frontend can listen to these events via:
- Celery task status polling
- WebSocket connections
- REST API `/task-progress/:task_id/` endpoint

---

## Summary

**6 AI Functions - All Production Ready:**

| Function | Lines of Code | Status | Used By |
|----------|---------------|--------|---------|
| `auto_cluster` | ~380 | ✅ Complete | Planner, Automation Stage 1 |
| `generate_ideas` | ~250 | ✅ Complete | Planner, Automation Stage 2 |
| `generate_content` | ~400 | ✅ Complete | Writer, Automation Stage 4 |
| `generate_image_prompts` | ~280 | ✅ Complete | Writer, Automation Stage 5 |
| `generate_images` | ~300 | ⚠️ Partial | Writer, Automation Stage 6 |
| `optimize_content` | ~200 | ✅ Complete | Writer (Manual) |

**Architecture Benefits:**
- Single source of truth for AI operations
- Consistent credit management
- Unified error handling
- Centralized progress tracking
- Easy to add new AI functions (inherit from BaseAIFunction)

### Current gaps vs code (Dec 2025)
- AIEngine now performs a credit pre-check before the AI call (still deducts after SAVE); this is not reflected in earlier notes.
- `generate_images` implementation is partially broken: it expects task IDs (not image IDs), tries to read `task.content` (field does not exist), and uses the `extract_image_prompts` prompt path; credit estimation also looks for `image_ids`. Treat it as partial/needs fix.
- AIEngine includes messaging/cost maps for `generate_site_structure` (extra function beyond the documented six); not presently documented above.

---

## Automation Integration

**VERIFIED:** All AI functions are integrated into the IGNY8 Automation Pipeline.

### 7-Stage Automation Pipeline

The automation system (`backend/igny8_core/business/automation/services/automation_service.py`) uses 5 of the 6 AI functions:

```
Stage 1: Keywords → Clusters
  ↓ Uses: AutoClusterFunction
  ↓ Credits: ~0.2 per keyword
  
Stage 2: Clusters → Ideas
  ↓ Uses: GenerateIdeasFunction
  ↓ Credits: 2 per cluster
  
Stage 3: Ideas → Tasks
  ↓ Uses: None (Local operation)
  ↓ Credits: 0
  
Stage 4: Tasks → Content
  ↓ Uses: GenerateContentFunction
  ↓ Credits: ~5 per task (2500 words)
  
Stage 5: Content → Image Prompts
  ↓ Uses: GenerateImagePromptsFunction
  ↓ Credits: ~2 per content
  
Stage 6: Image Prompts → Images
  ↓ Uses: GenerateImagesFunction ⚠️
  ↓ Credits: 1-4 per image
  
Stage 7: Manual Review Gate
  ↓ Uses: None (Manual intervention)
  ↓ Credits: 0
```

### Automation Execution Flow

```python
# AutomationService.run_stage_1() example
def run_stage_1(self):
    keywords = Keywords.objects.filter(site=self.site, status='new')[:batch_size]
    
    # Call AI function via Celery
    from igny8_core.ai.tasks import run_ai_task
    result = run_ai_task(
        function_name='auto_cluster',
        payload={'ids': [k.id for k in keywords]},
        account_id=self.account.id
    )
    
    # Credits automatically deducted by AIEngine
    return {
        'keywords_processed': len(keywords),
        'clusters_created': result.get('count', 0),
        'credits_used': result.get('credits_used', 0)
    }
```

### Frontend Access

**Automation Page:** `/automation` (Fully functional)
- Real-time pipeline overview
- Manual trigger ("Run Now" button)
- Pause/Resume controls
- Live progress tracking
- Activity logs
- Run history

**Planner & Writer Pages:** Individual AI function triggers
- Cluster keywords (Stage 1)
- Generate ideas (Stage 2)
- Generate content (Stage 4)
- Extract image prompts (Stage 5)
- Generate images (Stage 6)

---

**End of AI Functions Reference**