"""
Enhanced SAAP Agent Manager with OpenRouter Integration & Cost Efficiency Logging
Supports multi-provider architecture: colossus + OpenRouter with cost optimization
"""

import asyncio
import logging
import time
from datetime import datetime, timedelta
from typing import Dict, List, Optional, Any, Tuple
import json
from dataclasses import dataclass, asdict
from enum import Enum

import aiohttp
import openai  # For OpenRouter compatibility
from openai import AsyncOpenAI

from ..config.settings import get_settings
from ..models.agent import SaapAgent, AgentStatus, AgentCapability
from ..models.chat import ChatMessage, MessageRole
from ..database.service import DatabaseService

# Cost efficiency logging
cost_logger = logging.getLogger("saap.cost")
performance_logger = logging.getLogger("saap.performance")

@dataclass
class CostMetrics:
    """Cost tracking metrics for OpenRouter requests"""
    provider: str
    model: str
    input_tokens: int
    output_tokens: int
    total_tokens: int
    cost_usd: float
    response_time_seconds: float
    timestamp: datetime
    request_success: bool
    agent_id: str
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary for logging"""
        return {
            **asdict(self),
            'timestamp': self.timestamp.isoformat(),
            'cost_per_1k_tokens': round(self.cost_usd / (self.total_tokens / 1000), 6) if self.total_tokens > 0 else 0,
            'tokens_per_second': round(self.total_tokens / self.response_time_seconds, 2) if self.response_time_seconds > 0 else 0
        }

@dataclass  
class PerformanceMetrics:
    """Performance tracking for different providers"""
    provider: str
    model: str
    avg_response_time: float
    success_rate: float
    total_requests: int
    avg_cost_per_request: float
    tokens_per_second: float
    last_24h_cost: float
    
class ProviderType(Enum):
    COLOSSUS = "colossus"
    OPENROUTER = "openrouter"
    HYBRID = "hybrid"

class EnhancedAgentManager:
    """Enhanced Agent Manager with Multi-Provider Support & Cost Optimization"""
    
    def __init__(self, database_service: Optional[DatabaseService] = None):
        self.settings = get_settings()
        self.database = database_service
        self.agents: Dict[str, SaapAgent] = {}
        self.agent_clients: Dict[str, Any] = {}
        
        # Cost tracking
        self.cost_metrics: List[CostMetrics] = []
        self.daily_cost_budget = self.settings.agents.daily_cost_budget
        self.current_daily_cost = 0.0
        self.cost_alert_threshold = self.settings.agents.warning_cost_threshold
        
        # Performance tracking
        self.performance_stats: Dict[str, PerformanceMetrics] = {}
        
        # Provider configurations
        self._setup_providers()
        
        # Initialize cost logger
        if self.settings.openrouter.enable_cost_tracking:
            cost_logger.info(f"💰 Cost tracking initialized - Daily budget: ${self.daily_cost_budget}")
            cost_logger.info(f"📊 Alert threshold: {self.cost_alert_threshold*100}% of budget")
    
    def _setup_providers(self):
        """Setup provider configurations"""
        self.providers = {}
        
        # colossus Configuration
        if self.settings.colossus.api_key:
            self.providers[ProviderType.COLOSSUS] = {
                'client': None,  # Will be set up per agent
                'base_url': self.settings.colossus.api_base,
                'api_key': self.settings.colossus.api_key,
                'default_model': self.settings.colossus.default_model,
                'cost_per_1m_tokens': 0.0,  # colossus is free
                'timeout': self.settings.colossus.timeout
            }
        
        # OpenRouter Configuration  
        if self.settings.openrouter.enabled and self.settings.openrouter.api_key:
            self.providers[ProviderType.OPENROUTER] = {
                'client': AsyncOpenAI(
                    api_key=self.settings.openrouter.api_key,
                    base_url=self.settings.openrouter.base_url,
                ),
                'base_url': self.settings.openrouter.base_url,
                'api_key': self.settings.openrouter.api_key,
                'models': self._get_openrouter_models(),
                'timeout': 30
            }
            
            cost_logger.info(f"🔗 OpenRouter provider initialized with {len(self._get_openrouter_models())} models")
    
    def _get_openrouter_models(self) -> Dict[str, Dict[str, Any]]:
        """Get OpenRouter model configurations with cost data"""
        models = {
            # Jane Alesi - Coordination & Management (GPT-4o-mini)
            'jane_alesi': {
                'model': self.settings.openrouter.jane_model,
                'max_tokens': self.settings.openrouter.jane_max_tokens,
                'temperature': self.settings.openrouter.jane_temperature,
                'cost_per_1m_input': 0.15,
                'cost_per_1m_output': 0.60,
                'description': 'General coordination and management tasks'
            },
            
            # John Alesi - Development & Code (Claude-3-Haiku)  
            'john_alesi': {
                'model': self.settings.openrouter.john_model,
                'max_tokens': self.settings.openrouter.john_max_tokens,
                'temperature': self.settings.openrouter.john_temperature,
                'cost_per_1m_input': 0.25,
                'cost_per_1m_output': 1.25,
                'description': 'Code generation and development tasks'
            },
            
            # Lara Alesi - Medical & Analysis (GPT-4o-mini)
            'lara_alesi': {
                'model': self.settings.openrouter.lara_model, 
                'max_tokens': self.settings.openrouter.lara_max_tokens,
                'temperature': self.settings.openrouter.lara_temperature,
                'cost_per_1m_input': 0.15,
                'cost_per_1m_output': 0.60,
                'description': 'Medical analysis and specialized queries'
            },
            
            # Fallback Model - Free (Meta Llama)
            'fallback': {
                'model': self.settings.openrouter.fallback_model,
                'max_tokens': 600,
                'temperature': 0.7,
                'cost_per_1m_input': 0.0,
                'cost_per_1m_output': 0.0,
                'description': 'Cost-free fallback for budget limits'
            }
        }
        
        return models
    
    async def create_agent(self, agent_data: Dict[str, Any]) -> SaapAgent:
        """Create new agent with provider selection"""
        agent_id = agent_data.get('agent_id', f"agent_{len(self.agents)}")
        
        # Determine optimal provider based on agent type and cost considerations
        provider = self._select_optimal_provider(agent_id, agent_data)
        
        agent = SaapAgent(
            agent_id=agent_id,
            name=agent_data.get('name', f'Agent {agent_id}'),
            role=agent_data.get('role', 'General Assistant'),
            capabilities=agent_data.get('capabilities', [AgentCapability.CHAT]),
            status=AgentStatus.CREATED,
            llm_config=agent_data.get('llm_config', {}),
            personality=agent_data.get('personality', {}),
            provider=provider.value
        )
        
        # Setup provider-specific client
        await self._setup_agent_client(agent)
        
        self.agents[agent_id] = agent
        
        # Log agent creation with cost implications
        cost_logger.info(f"🤖 Agent created: {agent_id} using {provider.value} provider")
        if provider == ProviderType.OPENROUTER:
            model_config = self._get_openrouter_models().get(agent_id, self._get_openrouter_models()['fallback'])
            cost_logger.info(f"💰 Model: {model_config['model']} - Cost: ${model_config['cost_per_1m_input']}/1M input tokens")
        
        # Database persistence
        if self.database:
            await self.database.create_agent(agent)
        
        return agent
    
    def _select_optimal_provider(self, agent_id: str, agent_data: Dict[str, Any]) -> ProviderType:
        """Select optimal provider based on cost and performance requirements"""
        
        # Check daily budget constraints
        if self.current_daily_cost >= (self.daily_cost_budget * self.cost_alert_threshold):
            cost_logger.warning(f"⚠️ Daily cost budget at {self.cost_alert_threshold*100}% - using free providers")
            if ProviderType.COLOSSUS in self.providers:
                return ProviderType.COLOSSUS
        
        # Agent-specific provider selection
        primary_provider = getattr(self.settings.agents, 'primary_provider', 'colossus')
        
        if primary_provider == 'openrouter' and ProviderType.OPENROUTER in self.providers:
            # Use OpenRouter with cost-optimized models
            return ProviderType.OPENROUTER
        elif primary_provider == 'colossus' and ProviderType.COLOSSUS in self.providers:
            # Use colossus as primary (free)
            return ProviderType.COLOSSUS
        else:
            # Fallback to available provider
            if ProviderType.COLOSSUS in self.providers:
                return ProviderType.COLOSSUS
            elif ProviderType.OPENROUTER in self.providers:
                return ProviderType.OPENROUTER
            else:
                raise ValueError("No providers available")
    
    async def _setup_agent_client(self, agent: SaapAgent):
        """Setup provider-specific client for agent"""
        provider_type = ProviderType(agent.provider)
        
        if provider_type == ProviderType.COLOSSUS:
            # colossus HTTP client setup (existing logic)
            self.agent_clients[agent.agent_id] = aiohttp.ClientSession(
                timeout=aiohttp.ClientTimeout(total=self.settings.colossus.timeout)
            )
        
        elif provider_type == ProviderType.OPENROUTER:
            # OpenRouter client already set up in providers
            self.agent_clients[agent.agent_id] = self.providers[ProviderType.OPENROUTER]['client']
        
    async def start_agent(self, agent_id: str) -> bool:
        """Start agent with provider-specific initialization"""
        if agent_id not in self.agents:
            raise ValueError(f"Agent {agent_id} not found")
        
        agent = self.agents[agent_id]
        
        try:
            # Provider-specific startup
            if agent.provider == ProviderType.COLOSSUS.value:
                success = await self._start_colossus_agent(agent)
            elif agent.provider == ProviderType.OPENROUTER.value:
                success = await self._start_openrouter_agent(agent)
            else:
                success = False
            
            if success:
                agent.status = AgentStatus.ACTIVE
                agent.metrics.last_active = datetime.now()
                cost_logger.info(f"✅ Agent {agent_id} started successfully using {agent.provider}")
                
                # Database update
                if self.database:
                    await self.database.update_agent_status(agent_id, AgentStatus.ACTIVE)
            
            return success
            
        except Exception as e:
            cost_logger.error(f"❌ Failed to start agent {agent_id}: {str(e)}")
            agent.status = AgentStatus.ERROR
            return False
    
    async def _start_colossus_agent(self, agent: SaapAgent) -> bool:
        """Start colossus agent (existing logic)"""
        try:
            client = self.agent_clients[agent.agent_id]
            
            # Test connection to colossus
            async with client.post(
                f"{self.settings.colossus.api_base}/v1/chat/completions",
                headers={"Authorization": f"Bearer {self.settings.colossus.api_key}"},
                json={
                    "model": self.settings.colossus.default_model,
                    "messages": [{"role": "user", "content": "Test connection"}],
                    "max_tokens": 10
                }
            ) as response:
                return response.status == 200
                
        except Exception as e:
            cost_logger.error(f"colossus connection failed for {agent.agent_id}: {str(e)}")
            return False
    
    async def _start_openrouter_agent(self, agent: SaapAgent) -> bool:
        """Start OpenRouter agent"""
        try:
            client = self.agent_clients[agent.agent_id]
            model_config = self._get_openrouter_models().get(agent.agent_id, self._get_openrouter_models()['fallback'])
            
            # Test connection to OpenRouter
            response = await client.chat.completions.create(
                model=model_config['model'],
                messages=[{"role": "user", "content": "Test connection"}],
                max_tokens=10,
                temperature=model_config['temperature']
            )
            
            cost_logger.info(f"🔗 OpenRouter agent {agent.agent_id} connected - Model: {model_config['model']}")
            return True
            
        except Exception as e:
            cost_logger.error(f"OpenRouter connection failed for {agent.agent_id}: {str(e)}")
            return False
    
    async def send_message(self, agent_id: str, message: str, conversation_context: Optional[List[Dict]] = None) -> ChatMessage:
        """Send message to agent with cost tracking"""
        if agent_id not in self.agents:
            raise ValueError(f"Agent {agent_id} not found")
        
        agent = self.agents[agent_id]
        start_time = time.time()
        
        try:
            if agent.provider == ProviderType.COLOSSUS.value:
                response = await self._send_colossus_message(agent, message, conversation_context)
            elif agent.provider == ProviderType.OPENROUTER.value:
                response = await self._send_openrouter_message(agent, message, conversation_context)
            else:
                raise ValueError(f"Unsupported provider: {agent.provider}")
            
            response_time = time.time() - start_time
            
            # Update agent metrics
            agent.metrics.messages_processed += 1
            agent.metrics.last_active = datetime.now()
            agent.metrics.avg_response_time = (
                (agent.metrics.avg_response_time * (agent.metrics.messages_processed - 1) + response_time) 
                / agent.metrics.messages_processed
            )
            
            # Log performance
            performance_logger.info(f"📊 Agent {agent_id} - Response time: {response_time:.2f}s, Total messages: {agent.metrics.messages_processed}")
            
            return response
            
        except Exception as e:
            cost_logger.error(f"❌ Message failed for agent {agent_id}: {str(e)}")
            agent.status = AgentStatus.ERROR
            raise
    
    async def _send_colossus_message(self, agent: SaapAgent, message: str, context: Optional[List[Dict]] = None) -> ChatMessage:
        """Send message via colossus (existing logic with cost tracking)"""
        client = self.agent_clients[agent.agent_id]
        
        # Prepare messages
        messages = []
        if context:
            messages.extend(context)
        messages.append({"role": "user", "content": message})
        
        start_time = time.time()
        
        try:
            async with client.post(
                f"{self.settings.colossus.api_base}/v1/chat/completions",
                headers={"Authorization": f"Bearer {self.settings.colossus.api_key}"},
                json={
                    "model": self.settings.colossus.default_model,
                    "messages": messages,
                    "max_tokens": 800,
                    "temperature": 0.7
                }
            ) as response:
                if response.status != 200:
                    raise Exception(f"colossus API error: {response.status}")
                
                data = await response.json()
                content = data['choices'][0]['message']['content']
                response_time = time.time() - start_time
                
                # Cost tracking for colossus (free)
                cost_metrics = CostMetrics(
                    provider="colossus",
                    model=self.settings.colossus.default_model,
                    input_tokens=data.get('usage', {}).get('prompt_tokens', 0),
                    output_tokens=data.get('usage', {}).get('completion_tokens', 0),
                    total_tokens=data.get('usage', {}).get('total_tokens', 0),
                    cost_usd=0.0,  # colossus is free
                    response_time_seconds=response_time,
                    timestamp=datetime.now(),
                    request_success=True,
                    agent_id=agent.agent_id
                )
                
                self._log_cost_metrics(cost_metrics)
                
                return ChatMessage(
                    message_id=f"msg_{int(time.time())}",
                    role=MessageRole.ASSISTANT,
                    content=content,
                    timestamp=datetime.now(),
                    agent_id=agent.agent_id,
                    metadata={'provider': 'colossus', 'cost_usd': 0.0, 'tokens': cost_metrics.total_tokens}
                )
                
        except Exception as e:
            # Log failed request
            cost_metrics = CostMetrics(
                provider="colossus",
                model=self.settings.colossus.default_model,
                input_tokens=0,
                output_tokens=0,
                total_tokens=0,
                cost_usd=0.0,
                response_time_seconds=time.time() - start_time,
                timestamp=datetime.now(),
                request_success=False,
                agent_id=agent.agent_id
            )
            self._log_cost_metrics(cost_metrics)
            raise
    
    async def _send_openrouter_message(self, agent: SaapAgent, message: str, context: Optional[List[Dict]] = None) -> ChatMessage:
        """Send message via OpenRouter with cost tracking"""
        client = self.agent_clients[agent.agent_id]
        model_config = self._get_openrouter_models().get(agent.agent_id, self._get_openrouter_models()['fallback'])
        
        # Check budget before expensive request
        estimated_cost = self._estimate_request_cost(message, model_config)
        if self.current_daily_cost + estimated_cost > self.daily_cost_budget:
            cost_logger.warning(f"💸 Daily budget exceeded - switching to free fallback model")
            model_config = self._get_openrouter_models()['fallback']
        
        # Prepare messages
        messages = []
        if context:
            messages.extend(context)
        messages.append({"role": "user", "content": message})
        
        start_time = time.time()
        
        try:
            response = await client.chat.completions.create(
                model=model_config['model'],
                messages=messages,
                max_tokens=model_config['max_tokens'],
                temperature=model_config['temperature']
            )
            
            response_time = time.time() - start_time
            content = response.choices[0].message.content
            
            # Calculate actual cost
            input_tokens = response.usage.prompt_tokens
            output_tokens = response.usage.completion_tokens
            total_tokens = response.usage.total_tokens
            
            cost_usd = (
                (input_tokens / 1_000_000) * model_config['cost_per_1m_input'] +
                (output_tokens / 1_000_000) * model_config['cost_per_1m_output']
            )
            
            # Update daily cost tracking
            self.current_daily_cost += cost_usd
            
            # Cost tracking
            cost_metrics = CostMetrics(
                provider="openrouter",
                model=model_config['model'],
                input_tokens=input_tokens,
                output_tokens=output_tokens,
                total_tokens=total_tokens,
                cost_usd=cost_usd,
                response_time_seconds=response_time,
                timestamp=datetime.now(),
                request_success=True,
                agent_id=agent.agent_id
            )
            
            self._log_cost_metrics(cost_metrics)
            
            # Budget alert check
            if self.current_daily_cost >= (self.daily_cost_budget * self.cost_alert_threshold):
                cost_logger.warning(f"⚠️ Cost alert: ${self.current_daily_cost:.4f} / ${self.daily_cost_budget} ({self.current_daily_cost/self.daily_cost_budget*100:.1f}%)")
            
            return ChatMessage(
                message_id=f"msg_{int(time.time())}",
                role=MessageRole.ASSISTANT,
                content=content,
                timestamp=datetime.now(),
                agent_id=agent.agent_id,
                metadata={
                    'provider': 'openrouter', 
                    'model': model_config['model'],
                    'cost_usd': cost_usd,
                    'tokens': total_tokens,
                    'cost_efficiency': f"${cost_usd:.6f} ({total_tokens} tokens, {response_time:.1f}s)"
                }
            )
            
        except Exception as e:
            # Log failed request
            cost_metrics = CostMetrics(
                provider="openrouter",
                model=model_config['model'],
                input_tokens=0,
                output_tokens=0,
                total_tokens=0,
                cost_usd=0.0,
                response_time_seconds=time.time() - start_time,
                timestamp=datetime.now(),
                request_success=False,
                agent_id=agent.agent_id
            )
            self._log_cost_metrics(cost_metrics)
            raise
    
    def _estimate_request_cost(self, message: str, model_config: Dict[str, Any]) -> float:
        """Estimate cost for request (rough approximation)"""
        # Rough token estimation: ~4 chars per token
        estimated_input_tokens = len(message) / 4
        estimated_output_tokens = model_config['max_tokens'] * 0.5  # Assume 50% of max tokens
        
        cost_usd = (
            (estimated_input_tokens / 1_000_000) * model_config['cost_per_1m_input'] +
            (estimated_output_tokens / 1_000_000) * model_config['cost_per_1m_output']
        )
        
        return cost_usd
    
    def _log_cost_metrics(self, metrics: CostMetrics):
        """Log cost metrics for analysis"""
        self.cost_metrics.append(metrics)
        
        # Detailed cost logging
        cost_logger.info(f"💰 Cost Metrics: {json.dumps(metrics.to_dict())}")
        
        # Performance summary
        if metrics.request_success:
            efficiency = f"{metrics.total_tokens/metrics.response_time_seconds:.1f}" if metrics.response_time_seconds > 0 else "N/A"
            cost_logger.info(f"📊 {metrics.agent_id} - ${metrics.cost_usd:.6f} | {metrics.total_tokens} tokens | {metrics.response_time_seconds:.2f}s | {efficiency} tokens/s")
        
        # Cleanup old metrics (keep last 1000)
        if len(self.cost_metrics) > 1000:
            self.cost_metrics = self.cost_metrics[-1000:]
    
    def get_cost_summary(self, hours: int = 24) -> Dict[str, Any]:
        """Get cost summary for specified time period"""
        cutoff_time = datetime.now() - timedelta(hours=hours)
        recent_metrics = [m for m in self.cost_metrics if m.timestamp >= cutoff_time]
        
        if not recent_metrics:
            return {"total_cost": 0.0, "total_requests": 0, "average_cost_per_request": 0.0}
        
        total_cost = sum(m.cost_usd for m in recent_metrics)
        successful_requests = [m for m in recent_metrics if m.request_success]
        
        by_provider = {}
        for metrics in recent_metrics:
            if metrics.provider not in by_provider:
                by_provider[metrics.provider] = {"cost": 0.0, "requests": 0, "tokens": 0}
            by_provider[metrics.provider]["cost"] += metrics.cost_usd
            by_provider[metrics.provider]["requests"] += 1
            by_provider[metrics.provider]["tokens"] += metrics.total_tokens
        
        return {
            "total_cost_usd": round(total_cost, 4),
            "total_requests": len(recent_metrics),
            "successful_requests": len(successful_requests),
            "success_rate": len(successful_requests) / len(recent_metrics) if recent_metrics else 0,
            "average_cost_per_request": round(total_cost / len(recent_metrics), 6) if recent_metrics else 0,
            "daily_budget_used": round(self.current_daily_cost / self.daily_cost_budget * 100, 1),
            "by_provider": by_provider,
            "period_hours": hours,
            "budget_remaining_usd": max(0, self.daily_cost_budget - self.current_daily_cost)
        }
    
    async def get_all_agents(self) -> List[SaapAgent]:
        """Get all agents with current status"""
        return list(self.agents.values())
    
    async def get_agent(self, agent_id: str) -> Optional[SaapAgent]:
        """Get specific agent"""
        return self.agents.get(agent_id)
    
    async def stop_agent(self, agent_id: str) -> bool:
        """Stop agent and cleanup resources"""
        if agent_id not in self.agents:
            return False
        
        agent = self.agents[agent_id]
        agent.status = AgentStatus.INACTIVE
        
        # Cleanup client connection
        if agent_id in self.agent_clients:
            client = self.agent_clients[agent_id]
            if hasattr(client, 'close'):
                if asyncio.iscoroutinefunction(client.close):
                    await client.close()
                else:
                    client.close()
            del self.agent_clients[agent_id]
        
        cost_logger.info(f"🛑 Agent {agent_id} stopped")
        
        # Database update
        if self.database:
            await self.database.update_agent_status(agent_id, AgentStatus.INACTIVE)
        
        return True
    
    async def delete_agent(self, agent_id: str) -> bool:
        """Delete agent completely"""
        if agent_id not in self.agents:
            return False
        
        # Stop agent first
        await self.stop_agent(agent_id)
        
        # Remove from memory
        del self.agents[agent_id]
        
        cost_logger.info(f"🗑️ Agent {agent_id} deleted")
        
        # Database deletion
        if self.database:
            await self.database.delete_agent(agent_id)
        
        return True
    
    def reset_daily_costs(self):
        """Reset daily cost tracking (called at midnight)"""
        yesterday_cost = self.current_daily_cost
        self.current_daily_cost = 0.0
        
        cost_logger.info(f"📅 Daily cost reset - Yesterday: ${yesterday_cost:.4f}")
    
    async def __aenter__(self):
        """Async context manager entry"""
        return self
    
    async def __aexit__(self, exc_type, exc_val, exc_tb):
        """Async context manager exit - cleanup all resources"""
        for agent_id in list(self.agent_clients.keys()):
            await self.stop_agent(agent_id)
        cost_logger.info("🧹 Enhanced Agent Manager cleanup completed")