"""
Four-Bucket Context Assembly - Modernized prompt construction for luzia.
Phase 4 of Luzia modernization: Integrate hybrid retriever + semantic router into luzia CLI.

ENHANCED (Jan 2026): Added per-project RAG context injection.
- Each project can have .knowledge/ directory with project-specific facts
- Luzia injects relevant project knowledge before task dispatch
- Falls back to global KG if no project-specific knowledge exists
"""

import json
import os
import logging
from typing import Dict, List, Any, Optional
from datetime import datetime

logging.basicConfig(level=logging.INFO, format='%(levelname)s: %(message)s')
logger = logging.getLogger(__name__)


class FourBucketContextAssembler:
    """Assemble 4-bucket context for luzia prompt injection."""

    def __init__(self):
        self.hybrid_retriever = None
        self.semantic_router = None
        self.project_knowledge_loader = None
        self._initialize_components()

    def _initialize_components(self):
        """Lazy-load hybrid retriever, semantic router, and project knowledge loader."""
        try:
            # Import after paths are set up
            import sys
            sys.path.insert(0, os.path.dirname(__file__))
            from langchain_kg_retriever import KnowledgeGraphRetriever
            from semantic_router import SemanticRouter

            self.hybrid_retriever = KnowledgeGraphRetriever()
            self.semantic_router = SemanticRouter()
            logger.debug("✓ Hybrid retriever and semantic router loaded")
        except Exception as e:
            logger.debug(f"Could not load new retrievers (OK for fallback): {e}")
            self.hybrid_retriever = None
            self.semantic_router = None

        # Load project-specific knowledge loader
        try:
            from project_knowledge_loader import ProjectKnowledgeLoader
            self.project_knowledge_loader = ProjectKnowledgeLoader()
            logger.debug("✓ Project knowledge loader initialized")
        except Exception as e:
            logger.debug(f"Could not load project knowledge loader: {e}")
            self.project_knowledge_loader = None
    
    def get_global_identity(self) -> str:
        """Bucket 1: Global identity context (static)."""
        return """You are Claude, an AI assistant by Anthropic.
You specialize in software engineering and systems administration.
You have access to a knowledge graph of learned solutions and best practices.
Your goal is to help users accomplish their tasks efficiently and safely."""
    
    def get_project_grounding(self, project: str, user: str, cwd: str) -> str:
        """Bucket 2: Project-specific grounding (static, highest priority)."""
        return f"""PROJECT CONTEXT (HIGHEST PRIORITY):
- Project: {project}
- User: {user}
- Working Directory: {cwd}
- Permissions: Use luzia for cross-project work
- File Ownership: All changes must preserve ownership

IMPORTANT: This context is provided LAST for maximum precedence."""
    
    def get_project_knowledge_context(self, project: str, query: str) -> Dict[str, Any]:
        """Bucket 2.5: Project-specific RAG context from .knowledge/ directory."""

        if not self.project_knowledge_loader:
            return {"source": "none", "context": "", "entities": []}

        try:
            # Check if project has .knowledge/ directory
            if not self.project_knowledge_loader.has_knowledge(project):
                logger.debug(f"No .knowledge/ directory for {project}")
                return {"source": "none", "context": "", "entities": []}

            # Get formatted context for prompt
            context = self.project_knowledge_loader.format_for_prompt(project, query, max_tokens=1500)

            # Get relevant entities for metadata
            entities = self.project_knowledge_loader.search_project_knowledge(project, query, top_k=5)

            logger.debug(f"Loaded project knowledge for {project}: {len(entities)} relevant entities")

            return {
                "source": "project_kg",
                "context": context,
                "entities": entities,
                "timestamp": datetime.now().isoformat()
            }
        except Exception as e:
            logger.debug(f"Project knowledge retrieval failed: {e}")
            return {"source": "error", "context": "", "entities": [], "error": str(e)}

    def get_intelligence_context(self, query: str, project: str, max_results: int = 5) -> Dict[str, Any]:
        """Bucket 3: Dynamic intelligence from global KG retrieval."""

        if not self.hybrid_retriever:
            return {"source": "fallback", "results": []}

        try:
            # Build search query
            search_query = f"{project} {query}"

            # Retrieve relevant entities
            kg_results = self.hybrid_retriever.retrieve(search_query, top_k=max_results)

            logger.debug(f"Retrieved {len(kg_results)} KG results for '{search_query}'")

            return {
                "source": "hybrid_retrieval",
                "timestamp": datetime.now().isoformat(),
                "results": kg_results,
                "count": len(kg_results)
            }
        except Exception as e:
            logger.debug(f"KG retrieval failed (using fallback): {e}")
            return {"source": "fallback", "results": [], "error": str(e)}
    
    def get_task_context(self, query: str) -> Dict[str, Any]:
        """Bucket 4: Dynamic task context with domain detection."""
        
        task_context = {
            "original_query": query,
            "timestamp": datetime.now().isoformat()
        }
        
        if self.semantic_router:
            try:
                routing = self.semantic_router.route(query)
                task_context.update({
                    "detected_domain": routing["primary_domain"],
                    "domain_confidence": routing["confidence"],
                    "reasoning_enabled": routing["reasoning_enabled"],
                    "system_instructions": routing["system_instructions"]
                })
                logger.debug(f"Detected domain: {routing['primary_domain']} ({routing['confidence']:.2f})")
            except Exception as e:
                logger.debug(f"Domain detection failed: {e}")
        
        return task_context
    
    def assemble_prompt_context(self, query: str, project: str, user: str, cwd: str) -> str:
        """
        Assemble complete 5-bucket context for prompt injection.

        Order (IMPORTANT - recency bias means LAST items have highest precedence):
        1. Bucket 1: Identity (global)
        2. Bucket 3: Global Intelligence (learned solutions from /etc/luz-knowledge/)
        3. Bucket 2.5: Project Knowledge (from .knowledge/ directory - NEW)
        4. Bucket 4: Task (domain-specific)
        5. Bucket 2: Grounding (project, placed LAST for precedence)
        """

        buckets = []

        # Bucket 1: Identity
        buckets.append("## SYSTEM CONTEXT\n" + self.get_global_identity())

        # Bucket 3: Global Intelligence
        intelligence = self.get_intelligence_context(query, project)
        if intelligence.get("results"):
            intel_text = "## LEARNED KNOWLEDGE\nRelevant solutions from global knowledge graph:\n"
            for result in intelligence["results"]:
                intel_text += f"\n- {result.get('name', 'Unknown')}"
                if result.get('content'):
                    content_preview = result['content'][:100]
                    intel_text += f": {content_preview}..."
            buckets.append(intel_text)

        # Bucket 2.5: Project-Specific Knowledge (NEW - RAG from .knowledge/)
        project_knowledge = self.get_project_knowledge_context(project, query)
        if project_knowledge.get("context"):
            buckets.append("## PROJECT-SPECIFIC KNOWLEDGE\n" + project_knowledge["context"])
            logger.debug(f"Injected project knowledge ({len(project_knowledge.get('entities', []))} entities)")

        # Bucket 4: Task
        task_info = self.get_task_context(query)
        task_text = f"## TASK CONTEXT\nDetected Domain: {task_info.get('detected_domain', 'general')}\n"
        if task_info.get("system_instructions"):
            task_text += f"\n{task_info['system_instructions']}\n"
        buckets.append(task_text)

        # Bucket 2: Grounding (LAST for precedence)
        buckets.append("## PROJECT GROUNDING (HIGHEST PRIORITY)\n" +
                      self.get_project_grounding(project, user, cwd))

        return "\n\n".join(buckets)


class ContextCache:
    """Cache assembled context for efficiency."""
    
    def __init__(self, cache_dir: str = "/tmp/luzia_context_cache"):
        self.cache_dir = cache_dir
        os.makedirs(cache_dir, exist_ok=True)
    
    def get_cache_key(self, query: str, project: str) -> str:
        """Generate cache key for context."""
        import hashlib
        key = f"{project}:{query}"
        return hashlib.md5(key.encode()).hexdigest()[:16]
    
    def get(self, query: str, project: str) -> Optional[str]:
        """Retrieve cached context if available."""
        try:
            cache_file = os.path.join(self.cache_dir, self.get_cache_key(query, project))
            if os.path.exists(cache_file):
                with open(cache_file, 'r') as f:
                    data = json.load(f)
                    if (datetime.now().timestamp() - data['timestamp']) < 3600:  # 1 hour TTL
                        logger.debug("Using cached context")
                        return data['context']
        except Exception as e:
            logger.debug(f"Cache read failed: {e}")
        return None
    
    def set(self, query: str, project: str, context: str):
        """Cache assembled context."""
        try:
            cache_file = os.path.join(self.cache_dir, self.get_cache_key(query, project))
            data = {
                'timestamp': datetime.now().timestamp(),
                'context': context
            }
            with open(cache_file, 'w') as f:
                json.dump(data, f)
        except Exception as e:
            logger.debug(f"Cache write failed: {e}")


# Factory function for luzia integration
def create_context_assembler() -> FourBucketContextAssembler:
    """Factory function to create and configure assembler."""
    return FourBucketContextAssembler()


def assemble_prompt_context(query: str, project: str, user: str, cwd: str) -> str:
    """
    High-level API for luzia to use.
    
    Usage in luzia CLI:
        from four_bucket_context import assemble_prompt_context
        context = assemble_prompt_context(task_query, project_name, user, cwd)
    """
    assembler = create_context_assembler()
    return assembler.assemble_prompt_context(query, project, user, cwd)


# Testing
if __name__ == "__main__":
    logger.info("=" * 60)
    logger.info("PHASE 4+: Five-Bucket Context Assembly (with Project RAG)")
    logger.info("=" * 60)

    # Test context assembly
    test_query = "Create a REST API for user authentication with database"
    test_project = "musica"
    test_user = "admin"
    test_cwd = "/home/musica"

    logger.info(f"\nAssembling context for: {test_query}")

    assembler = create_context_assembler()

    # Show project knowledge status
    if assembler.project_knowledge_loader:
        logger.info("\nProject Knowledge Status:")
        projects_status = assembler.project_knowledge_loader.list_projects_with_knowledge()
        for p in projects_status[:5]:  # Show first 5
            status = "Has KG" if p["has_knowledge"] else "No KG"
            logger.info(f"  {p['project']}: {status}")

    context = assembler.assemble_prompt_context(test_query, test_project, test_user, test_cwd)

    logger.info("\nGenerated 5-Bucket Context:")
    logger.info("-" * 60)
    print(context[:2000])
    if len(context) > 2000:
        print(f"\n... ({len(context) - 2000} more characters)")
    logger.info("-" * 60)

    logger.info("\n✅ PHASE 4+ COMPLETE: Ready for luzia integration with project RAG")