"""
Response formatter for API responses.
"""

from typing import Any, Dict, Optional
from datetime import datetime


class ResponseFormatter:
    """Format API responses consistently"""
    
    def __init__(self):
        self.stats = {
            'responses_formatted': 0,
            'errors_formatted': 0,
            'success_responses': 0,
            'created_at': datetime.utcnow().isoformat()
        }
    
    def success(self, data: Any, message: str = "Success", metadata: Optional[Dict] = None) -> Dict[str, Any]:
        """Format success response"""
        self.stats['responses_formatted'] += 1
        self.stats['success_responses'] += 1
        
        response = {
            "status": "success",
            "message": message,
            "data": data,
            "timestamp": datetime.utcnow().isoformat()
        }
        
        if metadata:
            response["metadata"] = metadata
            
        return response
    
    def error(self, message: str, code: str = "ERROR", details: Optional[Dict] = None) -> Dict[str, Any]:
        """Format error response"""
        self.stats['responses_formatted'] += 1
        self.stats['errors_formatted'] += 1
        
        response = {
            "status": "error",
            "message": message,
            "code": code,
            "timestamp": datetime.utcnow().isoformat()
        }
        
        if details:
            response["details"] = details
            
        return response
    
    def health(self, healthy: bool = True, components: Optional[Dict] = None) -> Dict[str, Any]:
        """Format health check response"""
        self.stats['responses_formatted'] += 1
        
        return {
            "status": "healthy" if healthy else "unhealthy",
            "timestamp": datetime.utcnow().isoformat(),
            "components": components or {}
        }
    
    def rate_limit_error(self, client_stats: Dict) -> Dict[str, Any]:
        """Format rate limit error response"""
        self.stats['responses_formatted'] += 1
        self.stats['errors_formatted'] += 1
        
        return {
            "status": "error",
            "message": "Rate limit exceeded",
            "code": "RATE_LIMIT_EXCEEDED",
            "timestamp": datetime.utcnow().isoformat(),
            "details": {
                "remaining_tokens": client_stats.get('remaining_tokens', 0),
                "reset_time": client_stats.get('reset_time', 0),
                "requests_per_minute": client_stats.get('requests_per_minute', 0)
            }
        }
    
    def validation_error(self, field: str, message: str) -> Dict[str, Any]:
        """Format validation error response"""
        self.stats['responses_formatted'] += 1
        self.stats['errors_formatted'] += 1
        
        return {
            "status": "error",
            "message": f"Validation error: {message}",
            "code": "VALIDATION_ERROR",
            "timestamp": datetime.utcnow().isoformat(),
            "details": {
                "field": field,
                "validation_message": message
            }
        }
    
    def status_response(self, data: Dict) -> Dict[str, Any]:
        """Format status response"""
        self.stats['responses_formatted'] += 1
        self.stats['success_responses'] += 1
        
        return {
            "status": "success",
            "message": "System status",
            "data": data,
            "timestamp": datetime.utcnow().isoformat()
        }
    
    def heatmap_response(self, heatmap_data: Any, symbol: str, exchange: Optional[str] = None) -> Dict[str, Any]:
        """Format heatmap response"""
        self.stats['responses_formatted'] += 1
        self.stats['success_responses'] += 1
        
        if not heatmap_data:
            return self.error("Heatmap data not found", "HEATMAP_NOT_FOUND")
        
        return {
            "status": "success",
            "message": f"Heatmap data for {symbol}",
            "data": {
                "symbol": symbol,
                "exchange": exchange or "consolidated",
                "heatmap": heatmap_data
            },
            "timestamp": datetime.utcnow().isoformat()
        }
    
    def orderbook_response(self, orderbook_data: Any, symbol: str, exchange: str) -> Dict[str, Any]:
        """Format order book response"""
        self.stats['responses_formatted'] += 1
        self.stats['success_responses'] += 1
        
        if not orderbook_data:
            return self.error("Order book data not found", "ORDERBOOK_NOT_FOUND")
        
        return {
            "status": "success",
            "message": f"Order book data for {symbol}@{exchange}",
            "data": {
                "symbol": symbol,
                "exchange": exchange,
                "orderbook": orderbook_data
            },
            "timestamp": datetime.utcnow().isoformat()
        }
    
    def metrics_response(self, metrics_data: Any, symbol: str, exchange: str) -> Dict[str, Any]:
        """Format metrics response"""
        self.stats['responses_formatted'] += 1
        self.stats['success_responses'] += 1
        
        if not metrics_data:
            return self.error("Metrics data not found", "METRICS_NOT_FOUND")
        
        return {
            "status": "success",
            "message": f"Metrics data for {symbol}@{exchange}",
            "data": {
                "symbol": symbol,
                "exchange": exchange,
                "metrics": metrics_data
            },
            "timestamp": datetime.utcnow().isoformat()
        }
    
    def get_stats(self) -> Dict[str, Any]:
        """Get formatter statistics"""
        return {
            **self.stats,
            'uptime_seconds': (datetime.utcnow() - datetime.fromisoformat(self.stats['created_at'])).total_seconds(),
            'error_rate': self.stats['errors_formatted'] / max(1, self.stats['responses_formatted'])
        }