# AI Workflow Agent - Decision Agent (Core Brain)
"""
Decision Agent using LLM (Gemini 2.5 Flash or Ollama)
Analyzes user queries and decides:
- n8n automation
- ComfyUI generative workflow
- Hybrid (n8n + ComfyUI)
- External repo project
"""

import httpx
import json
import logging
from typing import Dict, Any, Optional, List

from config import settings, ProjectType, CLASSIFICATION_KEYWORDS

logger = logging.getLogger(__name__)


class DecisionAgent:
    """
    Core decision-making agent that analyzes user queries
    and determines the appropriate workflow type.
    """
    
    def __init__(self):
        self.llm_provider = settings.LLM_PROVIDER
        self.gemini_api_key = settings.GEMINI_API_KEY
        self.ollama_host = settings.OLLAMA_HOST
        self.ollama_model = settings.OLLAMA_MODEL
        self.client = httpx.AsyncClient(timeout=120.0)
    
    async def check_ollama_health(self) -> str:
        """Check if Ollama is running and responsive."""
        try:
            response = await self.client.get(f"{self.ollama_host}/api/tags")
            if response.status_code == 200:
                return "healthy"
            return "unhealthy"
        except Exception as e:
            logger.debug(f"Ollama health check failed: {e}")
            return "unreachable"
    
    async def ensure_model_available(self) -> bool:
        """Ensure the required model is available in Ollama."""
        try:
            # Check if model exists
            response = await self.client.get(f"{self.ollama_host}/api/tags")
            if response.status_code == 200:
                models = response.json().get("models", [])
                model_names = [m.get("name", "") for m in models]
                
                if self.model not in model_names and f"{self.model}:latest" not in model_names:
                    logger.info(f"Pulling model {self.model}...")
                    # Pull the model
                    pull_response = await self.client.post(
                        f"{self.ollama_host}/api/pull",
                        json={"name": self.model},
                        timeout=600.0  # 10 minutes for large models
                    )
                    return pull_response.status_code == 200
                return True
            return False
        except Exception as e:
            logger.debug(f"Model check failed: {e}")
            return False
    
    async def analyze(self, query: str, context: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """
        Analyze user query and determine project type.
        
        STRATEGY: Respect user's LLM toggle from context
        - If context says use_llm=True → Use Gemini (if available)
        - If context says use_llm=False → Use keywords only
        - If no context → Use Gemini (if available)
        
        Returns:
            Dict with project_type, confidence, explanation, suggested_tools, next_steps
        """
        
        # Check if LLM is explicitly disabled in context
        use_llm = True  # Default to LLM
        if context and isinstance(context, dict):
            use_llm = context.get('use_llm', True)  # Respect the toggle
        
        # PRIMARY: Try LLM if enabled and available
        if use_llm and self.gemini_api_key:
            llm_result = await self._llm_analyze(query, context)
            
            # If Gemini succeeded, use it
            if llm_result["project_type"] != ProjectType.UNKNOWN:
                final_result = llm_result
                final_result["classification_method"] = "Gemini 2.5 Flash (LLM)"
                logger.info(f"Decision (Gemini): {final_result['project_type']} (confidence: {final_result['confidence']:.2f})")
                final_result["suggested_tools"] = self._get_suggested_tools(final_result["project_type"])
                final_result["next_steps"] = self._get_next_steps(final_result["project_type"], query)
                return final_result
        
        # FALLBACK: Use keywords when LLM disabled or unavailable
        keyword_result = self._keyword_classify(query)
        keyword_result["classification_method"] = "Keyword Matching (Fallback)"
        logger.info(f"Decision (Keywords): {keyword_result['project_type']} (confidence: {keyword_result['confidence']:.2f})")
        keyword_result["suggested_tools"] = self._get_suggested_tools(keyword_result["project_type"])
        keyword_result["next_steps"] = self._get_next_steps(keyword_result["project_type"], query)
        return keyword_result
    
    def _keyword_classify(self, query: str) -> Dict[str, Any]:
        """Fast keyword-based classification (FALLBACK ONLY).
        
        Logic:
        - If both COMFYUI + N8N keywords present → HYBRID
        - Otherwise pick highest scoring type
        """
        query_lower = query.lower()
        scores = {}
        
        for project_type, keywords in CLASSIFICATION_KEYWORDS.items():
            score = sum(1 for kw in keywords if kw in query_lower)
            scores[project_type] = score
        
        # Check for HYBRID: both image generation AND automation keywords present
        comfyui_score = scores.get(ProjectType.COMFYUI, 0)
        n8n_score = scores.get(ProjectType.N8N, 0)
        
        # If both types have keywords, it's HYBRID
        if comfyui_score >= 1 and n8n_score >= 1:
            confidence = min((comfyui_score + n8n_score) / 3, 1.0)
            return {
                "project_type": ProjectType.HYBRID,
                "confidence": confidence,
                "explanation": "Detected hybrid automation + AI task."
            }
        
        # Otherwise use highest score
        if not scores or max(scores.values()) == 0:
            return {
                "project_type": ProjectType.N8N,
                "confidence": 0.3,
                "explanation": "Default to n8n automation. Tell me more about what you want to automate."
            }
        
        best_type = max(scores, key=scores.get)
        max_score = scores[best_type]
        confidence = min(max_score / 3, 1.0)
        
        explanations = {
            ProjectType.N8N: "Detected automation task.",
            ProjectType.COMFYUI: "Detected image generation task.",
            ProjectType.HYBRID: "Detected hybrid automation + AI task.",
            ProjectType.EXTERNAL_REPO: "Detected GitHub repository request."
        }
        
        return {
            "project_type": best_type,
            "confidence": confidence,
            "explanation": explanations.get(best_type, f"Detected {best_type}.")
        }
    
    async def _llm_analyze(self, query: str, context: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """LLM-based analysis using configured provider (Gemini or Ollama)."""
        
        if self.llm_provider == "gemini" and self.gemini_api_key:
            return await self._gemini_analyze(query, context)
        else:
            return await self._ollama_analyze(query, context)
    
    async def _gemini_analyze(self, query: str, context: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """Analyze using Google Gemini 2.5 Flash API.
        
        Use PRINCIPLE-BASED reasoning, not example-based.
        This way the LLM handles edge cases intelligently without constant prompt tweaking.
        """
        
        system_prompt = """You are a project classification assistant. Classify user requests into project types based on PRINCIPLES, not examples.

PRINCIPLES:
- **n8n**: Automation, workflows, data processing. Handles logic/connections/scheduling. (CSV reports are DATA, not images)
- **comfyui**: Visual generation. Creates images/photos/artwork using AI. (Image generation ONLY)
- **hybrid**: Both automation AND image generation in one workflow. (Must involve creating images AND automating something)
- **external_repo**: User wants to download/use existing code from GitHub

KEY DISTINCTION:
- "Report" = data document (n8n) 
- "Image/photo" = visual content (comfyui)
- Both = hybrid

Respond ONLY with valid JSON:
{"project_type": "n8n" | "comfyui" | "hybrid" | "external_repo" | "unknown", "confidence": 0.0-1.0, "explanation": "..."}"""

        user_prompt = f'Classify: "{query}"'
        
        try:
            response = await self.client.post(
                "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent",
                headers={"Content-Type": "application/json"},
                json={
                    "contents": [{
                        "parts": [{
                            "text": f"{system_prompt}\n\n{user_prompt}"
                        }]
                    }]
                },
                params={"key": self.gemini_api_key}
            )
            
            if response.status_code == 200:
                result = response.json()
                try:
                    # Extract text from Gemini response
                    text_content = result["candidates"][0]["content"]["parts"][0]["text"]
                    
                    # Try to extract JSON from the response
                    # Sometimes Gemini wraps JSON in markdown code blocks
                    if "```json" in text_content:
                        json_str = text_content.split("```json")[1].split("```")[0].strip()
                    elif "```" in text_content:
                        json_str = text_content.split("```")[1].split("```")[0].strip()
                    else:
                        json_str = text_content
                    
                    parsed = json.loads(json_str)
                    return {
                        "project_type": parsed.get("project_type", ProjectType.UNKNOWN),
                        "confidence": float(parsed.get("confidence", 0.5)),
                        "explanation": parsed.get("explanation", "Gemini analysis")
                    }
                except (json.JSONDecodeError, KeyError, IndexError) as e:
                    logger.warning(f"Failed to parse Gemini response: {e}")
                    return {
                        "project_type": ProjectType.UNKNOWN,
                        "confidence": 0.0,
                        "explanation": "Gemini response parsing failed"
                    }
            else:
                logger.debug(f"Gemini request failed: {response.status_code}")
                return {
                    "project_type": ProjectType.UNKNOWN,
                    "confidence": 0.0,
                    "explanation": "Gemini request failed"
                }
                
        except Exception as e:
            logger.debug(f"Gemini analysis error: {e}")
            return {
                "project_type": ProjectType.UNKNOWN,
                "confidence": 0.0,
                "explanation": f"Gemini error: {str(e)}"
            }

    async def _ollama_analyze(self, query: str, context: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """Analyze using Ollama (Qwen2.5 or other model).
        
        Use PRINCIPLE-BASED reasoning, not example-based.
        """
        
        system_prompt = """You are a project classification assistant. Classify user requests into project types based on PRINCIPLES, not examples.

PRINCIPLES:
- **n8n**: Automation, workflows, data processing. Handles logic/connections/scheduling. (CSV reports are DATA, not images)
- **comfyui**: Visual generation. Creates images/photos/artwork using AI. (Image generation ONLY)
- **hybrid**: Both automation AND image generation in one workflow. (Must involve creating images AND automating something)
- **external_repo**: User wants to download/use existing code from GitHub

KEY DISTINCTION:
- "Report" = data document (n8n) 
- "Image/photo" = visual content (comfyui)
- Both = hybrid

Respond ONLY with valid JSON:
{"project_type": "n8n" | "comfyui" | "hybrid" | "external_repo" | "unknown", "confidence": 0.0-1.0, "explanation": "..."}"""

        user_prompt = f'Classify: "{query}"'
        
        try:
            response = await self.client.post(
                f"{self.ollama_host}/api/generate",
                json={
                    "model": self.ollama_model,
                    "prompt": f"{system_prompt}\n\n{user_prompt}",
                    "stream": False,
                    "format": "json"
                }
            )
            
            if response.status_code == 200:
                result = response.json()
                llm_response = result.get("response", "{}")
                
                # Parse JSON response
                try:
                    parsed = json.loads(llm_response)
                    return {
                        "project_type": parsed.get("project_type", ProjectType.UNKNOWN),
                        "confidence": float(parsed.get("confidence", 0.5)),
                        "explanation": parsed.get("explanation", "Ollama analysis")
                    }
                except json.JSONDecodeError:
                    logger.warning(f"Failed to parse Ollama response: {llm_response}")
                    return {
                        "project_type": ProjectType.UNKNOWN,
                        "confidence": 0.0,
                        "explanation": "Ollama response parsing failed"
                    }
            else:
                logger.debug(f"Ollama request failed: {response.status_code}")
                return {
                    "project_type": ProjectType.UNKNOWN,
                    "confidence": 0.0,
                    "explanation": "Ollama request failed"
                }
                
        except Exception as e:
            logger.debug(f"Ollama analysis error: {e}")
            return {
                "project_type": ProjectType.UNKNOWN,
                "confidence": 0.0,
                "explanation": f"Ollama error: {str(e)}"
            }
    
    def _get_suggested_tools(self, project_type: str) -> List[str]:
        """Get suggested tools based on project type."""
        tools_map = {
            ProjectType.N8N: [
                "n8n_builder - Generate workflow JSON",
                "n8n_deploy - Deploy to n8n instance",
                "webhook_trigger - Setup webhook triggers"
            ],
            ProjectType.COMFYUI: [
                "comfyui_builder - Generate workflow graph",
                "comfyui_execute - Run workflow",
                "model_download - Download required models"
            ],
            ProjectType.HYBRID: [
                "n8n_builder - Generate automation workflow",
                "comfyui_builder - Generate AI workflow",
                "api_connector - Connect n8n to ComfyUI"
            ],
            ProjectType.EXTERNAL_REPO: [
                "github_search - Find relevant repositories",
                "docker_helper - Clone and build",
                "error_analyzer - Fix build issues"
            ]
        }
        return tools_map.get(project_type, ["unknown_tool"])
    
    def _get_next_steps(self, project_type: str, query: str) -> List[str]:
        """Get recommended next steps."""
        steps_map = {
            ProjectType.N8N: [
                "1. Generate workflow JSON template",
                "2. Customize nodes and connections",
                "3. Deploy to n8n instance",
                "4. Test with sample data"
            ],
            ProjectType.COMFYUI: [
                "1. Generate ComfyUI workflow graph",
                "2. Check required models are installed",
                "3. Execute workflow",
                "4. Review generated output"
            ],
            ProjectType.HYBRID: [
                "1. Create ComfyUI workflow for AI task",
                "2. Create n8n workflow for automation",
                "3. Connect n8n → ComfyUI via HTTP",
                "4. Test end-to-end pipeline"
            ],
            ProjectType.EXTERNAL_REPO: [
                "1. Search GitHub for relevant projects",
                "2. Select best matching repository",
                "3. Clone and configure with Docker",
                "4. Validate and fix any errors"
            ]
        }
        return steps_map.get(project_type, ["Please provide more details"])


# ============================================
# CrewAI Integration (Advanced Mode)
# ============================================

class CrewAIDecisionAgent:
    """
    Advanced decision agent using CrewAI framework.
    Used for more complex multi-step reasoning.
    """
    
    def __init__(self):
        self.simple_agent = DecisionAgent()
        # CrewAI setup would go here
        # We use simple agent for Phase 0, upgrade to CrewAI in Milestone 1
    
    async def analyze_complex(self, query: str, context: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        """
        Complex analysis using CrewAI agents.
        Reserved for Milestone 1 implementation.
        """
        # For now, delegate to simple agent
        return await self.simple_agent.analyze(query, context)