"""
MEXC Futures Web Client

This module implements a web-based client for MEXC futures trading
since their official API doesn't support futures (leverage) trading.

It mimics browser behavior by replicating the exact HTTP requests
that the web interface makes.
"""

import logging
import requests
import time
import json
import hmac
import hashlib
import base64
from typing import Dict, List, Optional, Any
from datetime import datetime
import uuid
from urllib.parse import urlencode

logger = logging.getLogger(__name__)

class MEXCFuturesWebClient:
    """
    MEXC Futures Web Client that mimics browser behavior for futures trading.
    
    Since MEXC's official API doesn't support futures, this client replicates
    the exact HTTP requests made by their web interface.
    """
    
    def __init__(self, session_cookies: Dict[str, str] = None):
        """
        Initialize the MEXC Futures Web Client
        
        Args:
            session_cookies: Dictionary of cookies from an authenticated browser session
        """
        self.session = requests.Session()
        
        # Base URLs for different endpoints
        self.base_url = "https://www.mexc.com"
        self.futures_api_url = "https://futures.mexc.com/api/v1"
        self.captcha_url = f"{self.base_url}/ucgateway/captcha_api/captcha/robot"
        
        # Session state
        self.is_authenticated = False
        self.user_id = None
        self.auth_token = None
        self.fingerprint = None
        self.visitor_id = None
        
        # Load session cookies if provided
        if session_cookies:
            self.load_session_cookies(session_cookies)
        
        # Setup default headers that mimic a real browser
        self.setup_browser_headers()
        
    def setup_browser_headers(self):
        """Setup default headers that mimic Chrome browser"""
        self.session.headers.update({
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36',
            'Accept': '*/*',
            'Accept-Language': 'en-GB,en-US;q=0.9,en;q=0.8',
            'Accept-Encoding': 'gzip, deflate, br',
            'sec-ch-ua': '"Chromium";v="136", "Google Chrome";v="136", "Not.A/Brand";v="99"',
            'sec-ch-ua-mobile': '?0',
            'sec-ch-ua-platform': '"Windows"',
            'sec-fetch-dest': 'empty',
            'sec-fetch-mode': 'cors',
            'sec-fetch-site': 'same-origin',
            'Cache-Control': 'no-cache',
            'Pragma': 'no-cache',
            'Referer': f'{self.base_url}/en-GB/futures/ETH_USDT?type=linear_swap',
            'Language': 'English',
            'X-Language': 'en-GB',
            'trochilus-trace-id': f"{uuid.uuid4()}-{int(time.time() * 1000) % 10000:04d}",
            'trochilus-uid': str(self.user_id) if self.user_id is not None else ''
        })
        
    def load_session_cookies(self, cookies: Dict[str, str]):
        """
        Load session cookies from browser
        
        Args:
            cookies: Dictionary of cookie name-value pairs
        """
        for name, value in cookies.items():
            self.session.cookies.set(name, value)
            
        # Extract important session info from cookies
        self.auth_token = cookies.get('uc_token')
        self.user_id = cookies.get('u_id') 
        self.fingerprint = cookies.get('x-mxc-fingerprint')
        self.visitor_id = cookies.get('mexc_fingerprint_visitorId')
        
        if self.auth_token and self.user_id:
            self.is_authenticated = True
            logger.info("MEXC: Loaded authenticated session")
        else:
            logger.warning("MEXC: Session cookies incomplete - authentication may fail")
    
    def extract_cookies_from_browser(self, cookie_string: str) -> Dict[str, str]:
        """
        Extract cookies from a browser cookie string
        
        Args:
            cookie_string: Raw cookie string from browser (copy from Network tab)
            
        Returns:
            Dictionary of parsed cookies
        """
        cookies = {}
        cookie_pairs = cookie_string.split(';')
        
        for pair in cookie_pairs:
            if '=' in pair:
                name, value = pair.strip().split('=', 1)
                cookies[name] = value
                
        return cookies
    
    def verify_captcha(self, symbol: str, side: str, leverage: str) -> bool:
        """
        Verify captcha for robot trading protection
        
        Args:
            symbol: Trading symbol (e.g., 'ETH_USDT')
            side: 'openlong', 'closelong', 'openshort', 'closeshort'
            leverage: Leverage string (e.g., '200X')
            
        Returns:
            bool: True if captcha verification successful
        """
        if not self.is_authenticated:
            logger.error("MEXC: Cannot verify captcha - not authenticated")
            return False
            
        # Build captcha endpoint URL
        endpoint = f"robot.future.{side}.{symbol}.{leverage}"
        url = f"{self.captcha_url}/{endpoint}"
        
        # Setup headers for captcha request
        headers = {
            'Content-Type': 'application/json',
            'Language': 'en-GB',
            'Referer': f'{self.base_url}/en-GB/futures/{symbol}?type=linear_swap',
            'trochilus-uid': self.user_id if self.user_id else '',
            'trochilus-trace-id': f"{uuid.uuid4()}-{int(time.time() * 1000) % 10000:04d}"
        }
        
        # Add captcha token if available (this would need to be extracted from browser)
        # For now, we'll make the request without it and see what happens
        
        try:
            response = self.session.get(url, headers=headers, timeout=10)
            
            if response.status_code == 200:
                data = response.json()
                if data.get('success') and data.get('code') == 0:
                    logger.info(f"MEXC: Captcha verification successful for {side} {symbol}")
                    return True
                else:
                    logger.warning(f"MEXC: Captcha verification failed: {data}")
                    return False
            else:
                logger.error(f"MEXC: Captcha request failed with status {response.status_code}")
                return False
                
        except Exception as e:
            logger.error(f"MEXC: Captcha verification error: {e}")
            return False
    
    def generate_signature(self, method: str, path: str, params: Dict[str, Any], 
                          timestamp: int, nonce: int) -> str:
        """
        Generate signature for MEXC futures API requests
        
        This is reverse-engineered from the browser requests
        """
        # This is a placeholder - the actual signature generation would need
        # to be reverse-engineered from the browser's JavaScript
        # For now, return empty string and rely on cookie authentication
        return ""
    
    def open_long_position(self, symbol: str, volume: float, leverage: int = 200,
                          price: Optional[float] = None) -> Dict[str, Any]:
        """
        Open a long futures position
        
        Args:
            symbol: Trading symbol (e.g., 'ETH_USDT')
            volume: Position size (contracts)
            leverage: Leverage multiplier (default 200)
            price: Limit price (None for market order)
            
        Returns:
            dict: Order response with order ID
        """
        if not self.is_authenticated:
            logger.error("MEXC: Cannot open position - not authenticated")
            return {'success': False, 'error': 'Not authenticated'}
        
        # First verify captcha
        if not self.verify_captcha(symbol, 'openlong', f'{leverage}X'):
            logger.error("MEXC: Captcha verification failed for opening long position")
            return {'success': False, 'error': 'Captcha verification failed'}
        
        # Prepare order parameters based on the request dump
        timestamp = int(time.time() * 1000)
        nonce = timestamp
        
        order_data = {
            'symbol': symbol,
            'side': 1,  # 1 = long, 2 = short
            'openType': 2,  # Open position
            'type': '5',  # Market order (might be '1' for limit)
            'vol': volume,
            'leverage': leverage,
            'marketCeiling': False,
            'priceProtect': '0',
            'ts': timestamp,
            'mhash': self._generate_mhash(),  # This needs to be implemented
            'mtoken': self.visitor_id
        }
        
        # Add price for limit orders
        if price is not None:
            order_data['price'] = price
            order_data['type'] = '1'  # Limit order
        
        # Add encrypted parameters (these would need proper implementation)
        order_data['p0'] = self._encrypt_p0(order_data)  # Placeholder
        order_data['k0'] = self._encrypt_k0(order_data)  # Placeholder
        order_data['chash'] = self._generate_chash(order_data)  # Placeholder
        
        # Setup headers for the order request
        headers = {
            'Authorization': self.auth_token,
            'Content-Type': 'application/json',
            'Language': 'English',
            'x-language': 'en-GB',
            'x-mxc-nonce': str(nonce),
            'x-mxc-sign': self.generate_signature('POST', '/private/order/create', order_data, timestamp, nonce),
            'trochilus-uid': self.user_id,
            'trochilus-trace-id': f"{uuid.uuid4()}-{int(time.time() * 1000) % 10000:04d}",
            'Referer': 'https://www.mexc.com/'
        }
        
        # Make the order request
        url = f"{self.futures_api_url}/private/order/create"
        
        try:
            # First make OPTIONS request (preflight)
            options_response = self.session.options(url, headers=headers, timeout=10)
            
            if options_response.status_code == 200:
                # Now make the actual POST request
                response = self.session.post(url, json=order_data, headers=headers, timeout=15)
                
                if response.status_code == 200:
                    data = response.json()
                    if data.get('success') and data.get('code') == 0:
                        order_id = data.get('data', {}).get('orderId')
                        logger.info(f"MEXC: Long position opened successfully - Order ID: {order_id}")
                        return {
                            'success': True,
                            'order_id': order_id,
                            'timestamp': data.get('data', {}).get('ts'),
                            'symbol': symbol,
                            'side': 'long',
                            'volume': volume,
                            'leverage': leverage
                        }
                    else:
                        logger.error(f"MEXC: Order failed: {data}")
                        return {'success': False, 'error': data.get('msg', 'Unknown error')}
                else:
                    logger.error(f"MEXC: Order request failed with status {response.status_code}")
                    return {'success': False, 'error': f'HTTP {response.status_code}'}
            else:
                logger.error(f"MEXC: OPTIONS preflight failed with status {options_response.status_code}")
                return {'success': False, 'error': f'Preflight failed: HTTP {options_response.status_code}'}
                
        except Exception as e:
            logger.error(f"MEXC: Order execution error: {e}")
            return {'success': False, 'error': str(e)}
    
    def close_long_position(self, symbol: str, volume: float, leverage: int = 200,
                           price: Optional[float] = None) -> Dict[str, Any]:
        """
        Close a long futures position
        
        Args:
            symbol: Trading symbol (e.g., 'ETH_USDT')
            volume: Position size to close (contracts)
            leverage: Leverage multiplier
            price: Limit price (None for market order)
            
        Returns:
            dict: Order response
        """
        if not self.is_authenticated:
            logger.error("MEXC: Cannot close position - not authenticated")
            return {'success': False, 'error': 'Not authenticated'}
        
        # First verify captcha
        if not self.verify_captcha(symbol, 'closelong', f'{leverage}X'):
            logger.error("MEXC: Captcha verification failed for closing long position")
            return {'success': False, 'error': 'Captcha verification failed'}
        
        # Similar to open_long_position but with closeType instead of openType
        timestamp = int(time.time() * 1000)
        nonce = timestamp
        
        order_data = {
            'symbol': symbol,
            'side': 2,  # Close side is opposite
            'closeType': 1,  # Close position
            'type': '5',  # Market order
            'vol': volume,
            'leverage': leverage,
            'marketCeiling': False,
            'priceProtect': '0',
            'ts': timestamp,
            'mhash': self._generate_mhash(),
            'mtoken': self.visitor_id
        }
        
        if price is not None:
            order_data['price'] = price
            order_data['type'] = '1'
        
        order_data['p0'] = self._encrypt_p0(order_data)
        order_data['k0'] = self._encrypt_k0(order_data)
        order_data['chash'] = self._generate_chash(order_data)
        
        return self._execute_order(order_data, 'close_long')
    
    def open_short_position(self, symbol: str, volume: float, leverage: int = 200,
                           price: Optional[float] = None) -> Dict[str, Any]:
        """Open a short futures position"""
        if not self.verify_captcha(symbol, 'openshort', f'{leverage}X'):
            return {'success': False, 'error': 'Captcha verification failed'}
        
        order_data = {
            'symbol': symbol,
            'side': 2,  # 2 = short
            'openType': 2,
            'type': '5',
            'vol': volume,
            'leverage': leverage,
            'marketCeiling': False,
            'priceProtect': '0',
            'ts': int(time.time() * 1000),
            'mhash': self._generate_mhash(),
            'mtoken': self.visitor_id
        }
        
        if price is not None:
            order_data['price'] = price
            order_data['type'] = '1'
        
        order_data['p0'] = self._encrypt_p0(order_data)
        order_data['k0'] = self._encrypt_k0(order_data)
        order_data['chash'] = self._generate_chash(order_data)
        
        return self._execute_order(order_data, 'open_short')
    
    def close_short_position(self, symbol: str, volume: float, leverage: int = 200,
                            price: Optional[float] = None) -> Dict[str, Any]:
        """Close a short futures position"""
        if not self.verify_captcha(symbol, 'closeshort', f'{leverage}X'):
            return {'success': False, 'error': 'Captcha verification failed'}
        
        order_data = {
            'symbol': symbol,
            'side': 1,  # Close side is opposite
            'closeType': 1,
            'type': '5',
            'vol': volume,
            'leverage': leverage,
            'marketCeiling': False,
            'priceProtect': '0',
            'ts': int(time.time() * 1000),
            'mhash': self._generate_mhash(),
            'mtoken': self.visitor_id
        }
        
        if price is not None:
            order_data['price'] = price
            order_data['type'] = '1'
        
        order_data['p0'] = self._encrypt_p0(order_data)
        order_data['k0'] = self._encrypt_k0(order_data)
        order_data['chash'] = self._generate_chash(order_data)
        
        return self._execute_order(order_data, 'close_short')
    
    def _execute_order(self, order_data: Dict[str, Any], action: str) -> Dict[str, Any]:
        """Common order execution logic"""
        timestamp = order_data['ts']
        nonce = timestamp
        
        headers = {
            'Authorization': self.auth_token,
            'Content-Type': 'application/json',
            'Language': 'English',
            'x-language': 'en-GB',
            'x-mxc-nonce': str(nonce),
            'x-mxc-sign': self.generate_signature('POST', '/private/order/create', order_data, timestamp, nonce),
            'trochilus-uid': self.user_id,
            'trochilus-trace-id': f"{uuid.uuid4()}-{int(time.time() * 1000) % 10000:04d}",
            'Referer': 'https://www.mexc.com/'
        }
        
        url = f"{self.futures_api_url}/private/order/create"
        
        try:
            response = self.session.post(url, json=order_data, headers=headers, timeout=15)
            
            if response.status_code == 200:
                data = response.json()
                if data.get('success') and data.get('code') == 0:
                    order_id = data.get('data', {}).get('orderId')
                    logger.info(f"MEXC: {action} executed successfully - Order ID: {order_id}")
                    return {
                        'success': True,
                        'order_id': order_id,
                        'timestamp': data.get('data', {}).get('ts'),
                        'action': action
                    }
                else:
                    logger.error(f"MEXC: {action} failed: {data}")
                    return {'success': False, 'error': data.get('msg', 'Unknown error')}
            else:
                logger.error(f"MEXC: {action} request failed with status {response.status_code}")
                return {'success': False, 'error': f'HTTP {response.status_code}'}
                
        except Exception as e:
            logger.error(f"MEXC: {action} execution error: {e}")
            return {'success': False, 'error': str(e)}
    
    # Placeholder methods for encryption/hashing - these need proper implementation
    def _generate_mhash(self) -> str:
        """Generate mhash parameter (needs reverse engineering)"""
        return "a0015441fd4c3b6ba427b894b76cb7dd"  # Placeholder from request dump
    
    def _encrypt_p0(self, order_data: Dict[str, Any]) -> str:
        """Encrypt p0 parameter (needs reverse engineering)"""
        return "placeholder_p0_encryption"  # This needs proper implementation
    
    def _encrypt_k0(self, order_data: Dict[str, Any]) -> str:
        """Encrypt k0 parameter (needs reverse engineering)"""
        return "placeholder_k0_encryption"  # This needs proper implementation
    
    def _generate_chash(self, order_data: Dict[str, Any]) -> str:
        """Generate chash parameter (needs reverse engineering)"""
        return "d6c64d28e362f314071b3f9d78ff7494d9cd7177ae0465e772d1840e9f7905d8"  # Placeholder
    
    def get_account_info(self) -> Dict[str, Any]:
        """Get account information including positions and balances"""
        if not self.is_authenticated:
            return {'success': False, 'error': 'Not authenticated'}
        
        # This would need to be implemented by reverse engineering the account info endpoints
        logger.info("MEXC: Account info endpoint not yet implemented")
        return {'success': False, 'error': 'Not implemented'}
    
    def get_open_positions(self) -> List[Dict[str, Any]]:
        """Get list of open futures positions"""
        if not self.is_authenticated:
            return []
        
        # This would need to be implemented by reverse engineering the positions endpoint
        logger.info("MEXC: Open positions endpoint not yet implemented")
        return []