"""
Tools Service for LLM Function Calling
HuggingFace-compatible với prompt engineering
"""
import httpx
from typing import List, Dict, Any, Optional
import json
import asyncio


class ToolsService:
    """
    Manages external API tools that LLM can call via prompt engineering
    """
    
    def __init__(self, base_url: str = "https://hoalacrent.io.vn/api/v0"):
        self.base_url = base_url
        self.client = httpx.AsyncClient(timeout=10.0)
    
    def get_tools_definition(self) -> List[Dict]:
        """
        Return list of tool definitions (OpenAI format style)
        Used for constructing system prompt
        """
        return [
            {
                "name": "search_events",
                "description": "Tìm kiếm sự kiện phù hợp theo từ khóa, vibe, hoặc thời gian.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "query": {"type": "string", "description": "Từ khóa tìm kiếm (VD: 'nhạc rock', 'hài kịch')"},
                        "vibe": {"type": "string", "description": "Vibe/Mood (VD: 'chill', 'sôi động', 'hẹn hò')"},
                        "time": {"type": "string", "description": "Thời gian (VD: 'cuối tuần này', 'tối nay')"}
                    }
                }
            },
            {
                "name": "get_event_details",
                "description": "Lấy thông tin chi tiết (giá, địa điểm, thời gian) của sự kiện.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "event_id": {"type": "string", "description": "ID của sự kiện (MongoDB ID)"}
                    },
                    "required": ["event_id"]
                }
            },
            {
                "name": "get_purchased_events",
                "description": "Kiểm tra lịch sử các sự kiện user đã mua vé hoặc tham gia.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "user_id": {"type": "string", "description": "ID của user"}
                    },
                    "required": ["user_id"]
                }
            },
            {
                "name": "save_feedback",
                "description": "Lưu đánh giá/feedback của user về sự kiện.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "event_id": {"type": "string", "description": "ID sự kiện"},
                        "rating": {"type": "integer", "description": "Số sao đánh giá (1-5)"},
                        "comment": {"type": "string", "description": "Nội dung nhận xét"}
                    },
                    "required": ["event_id", "rating"]
                }
            },
            {
                "name": "save_lead",
                "description": "Lưu thông tin khách hàng quan tâm (Lead).",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "email": {"type": "string"},
                        "phone": {"type": "string"},
                        "interest": {"type": "string"}
                    }
                }
            }
        ]

    async def execute_tool(self, tool_name: str, arguments: Dict, access_token: Optional[str] = None) -> Any:
        """
        Execute a tool by name with arguments
        
        Args:
            tool_name: Name of the tool
            arguments: Tool arguments
            access_token: JWT token for authenticated API calls
        """
        print(f"🔧 Executing Tool: {tool_name} with args: {arguments}")
        
        try:
            if tool_name == "get_event_details":
                return await self._get_event_details(arguments.get("event_id") or arguments.get("event_code"))
            
            elif tool_name == "get_purchased_events":
                return await self._get_purchased_events(
                    arguments.get("user_id"),
                    access_token=access_token  # Pass access_token
                )
            
            elif tool_name == "save_feedback":
                return await self._save_feedback(
                    arguments.get("event_id"),
                    arguments.get("rating"),
                    arguments.get("comment")
                )
            
            elif tool_name == "search_events":
                # Note: This usually requires RAG service, so we return a special signal
                # The Agent Service will handle RAG search
                return {"action": "run_rag_search", "query": arguments}
            
            elif tool_name == "save_lead":
                # Placeholder for lead saving
                return {"success": True, "message": "Lead saved successfully"}
            
            else:
                return {"error": f"Unknown tool: {tool_name}"}
                
        except Exception as e:
            print(f"⚠️ Tool Execution Error: {e}")
            return {"error": str(e)}

    async def _get_event_details(self, event_id: str) -> Dict:
        """Call API to get event details"""
        if not event_id:
            return {"error": "Missing event_id"}
            
        try:
            url = f"{self.base_url}/event/get-event-by-id"
            
            response = await self.client.get(url, params={"id": event_id})
            if response.status_code == 200:
                data = response.json()
                if data.get("success"):
                    return data.get("data")
            return {"error": "Event not found", "details": response.text}
        except Exception as e:
            return {"error": str(e)}

    async def _get_purchased_events(self, user_id: str, access_token: Optional[str] = None) -> List[Dict]:
        """Call API to get purchased events for user (requires auth)"""
        if not user_id:
            return []
            
        try:
            url = f"{self.base_url}/event/get-purchase-event-by-user-id/{user_id}"
            print(f"🔍 Calling API: {url}")
            
            # Add Authorization header if access_token provided
            headers = {}
            if access_token:
                headers["Authorization"] = f"Bearer {access_token}"
                print(f"🔐 Using access_token for authentication")
            
            response = await self.client.get(url, headers=headers)
            if response.status_code == 200:
                data = response.json()
                # API returns {data: [...]}
                return data.get("data", [])
            
            print(f"⚠️ API Error: {response.status_code} - {response.text}")
            return []
        except Exception as e:
            print(f"⚠️ API Exception: {e}")
            return []

    async def _save_feedback(self, event_id: str, rating: int, comment: str) -> Dict:
        """Save feedback (Mock or Real API)"""
        # TODO: Implement real API call when available
        print(f"📝 Saving Feedback: Event={event_id}, Rating={rating}, Comment={comment}")
        return {"success": True, "message": "Feedback recorded"}

    async def close(self):
        """Close HTTP client"""
        await self.client.aclose()