"""
MCP component for MCP server integration
"""

import subprocess
import sys
import json
from typing import Dict, List, Tuple, Any
from pathlib import Path

from ..base.component import Component
from ..core.settings_manager import SettingsManager
from ..utils.logger import get_logger
from ..utils.ui import confirm, display_info, display_warning


class MCPComponent(Component):
    """MCP servers integration component"""
    
    def __init__(self, install_dir: Path = None):
        """Initialize MCP component"""
        super().__init__(install_dir)
        self.logger = get_logger()
        self.settings_manager = SettingsManager(self.install_dir)
        
        # Define MCP servers to install
        self.mcp_servers = {
            "sequential-thinking": {
                "name": "sequential-thinking",
                "description": "Multi-step problem solving and systematic analysis",
                "npm_package": "@modelcontextprotocol/server-sequential-thinking",
                "command": "npx @modelcontextprotocol/server-sequential-thinking",
                "required": True
            },
            "context7": {
                "name": "context7", 
                "description": "Official library documentation and code examples",
                "npm_package": "@context7/mcp",
                "command": "npx @context7/mcp",
                "required": True
            },
            "magic": {
                "name": "magic",
                "description": "Modern UI component generation and design systems",
                "npm_package": "@21st/mcp",
                "command": "npx @21st/mcp",
                "required": False,
                "api_key_env": "TWENTYFIRST_API_KEY",
                "api_key_description": "21st.dev API key for UI component generation"
            },
            "playwright": {
                "name": "playwright",
                "description": "Cross-browser E2E testing and automation",
                "npm_package": "@modelcontextprotocol/server-playwright",
                "command": "npx @modelcontextprotocol/server-playwright",
                "required": False
            }
        }
    
    def get_metadata(self) -> Dict[str, str]:
        """Get component metadata"""
        return {
            "name": "mcp",
            "version": "3.0.0",
            "description": "MCP server integration (Context7, Sequential, Magic, Playwright)",
            "category": "integration"
        }
    
    def validate_prerequisites(self) -> Tuple[bool, List[str]]:
        """Check prerequisites"""
        errors = []
        
        # Check if Node.js is available
        try:
            result = subprocess.run(
                ["node", "--version"], 
                capture_output=True, 
                text=True, 
                timeout=10,
                shell=(sys.platform == "win32")
            )
            if result.returncode != 0:
                errors.append("Node.js not found - required for MCP servers")
            else:
                version = result.stdout.strip()
                self.logger.debug(f"Found Node.js {version}")
                
                # Check version (require 18+)
                try:
                    version_num = int(version.lstrip('v').split('.')[0])
                    if version_num < 18:
                        errors.append(f"Node.js version {version} found, but version 18+ required")
                except:
                    self.logger.warning(f"Could not parse Node.js version: {version}")
        except (subprocess.TimeoutExpired, FileNotFoundError):
            errors.append("Node.js not found - required for MCP servers")
        
        # Check if Claude CLI is available
        try:
            result = subprocess.run(
                ["claude", "--version"], 
                capture_output=True, 
                text=True, 
                timeout=10,
                shell=(sys.platform == "win32")
            )
            if result.returncode != 0:
                errors.append("Claude CLI not found - required for MCP server management")
            else:
                version = result.stdout.strip()
                self.logger.debug(f"Found Claude CLI {version}")
        except (subprocess.TimeoutExpired, FileNotFoundError):
            errors.append("Claude CLI not found - required for MCP server management")
        
        # Check if npm is available
        try:
            result = subprocess.run(
                ["npm", "--version"], 
                capture_output=True, 
                text=True, 
                timeout=10,
                shell=(sys.platform == "win32")
            )
            if result.returncode != 0:
                errors.append("npm not found - required for MCP server installation")
            else:
                version = result.stdout.strip()
                self.logger.debug(f"Found npm {version}")
        except (subprocess.TimeoutExpired, FileNotFoundError):
            errors.append("npm not found - required for MCP server installation")
        
        return len(errors) == 0, errors
    
    def get_files_to_install(self) -> List[Tuple[Path, Path]]:
        """Get files to install (none for MCP component)"""
        return []
    
    def get_metadata_modifications(self) -> Dict[str, Any]:
        """Get metadata modifications for MCP component"""
        return {
            "components": {
                "mcp": {
                    "version": "3.0.0",
                    "installed": True,
                    "servers_count": len(self.mcp_servers)
                }
            },
            "mcp": {
                "enabled": True,
                "servers": list(self.mcp_servers.keys()),
                "auto_update": False
            }
        }
    
    def get_settings_modifications(self) -> Dict[str, Any]:
        """Get settings.json modifications (now only Claude Code compatible settings)"""
        # Return empty dict as we don't modify Claude Code settings
        return {}
    
    def _check_mcp_server_installed(self, server_name: str) -> bool:
        """Check if MCP server is already installed"""
        try:
            result = subprocess.run(
                ["claude", "mcp", "list"], 
                capture_output=True, 
                text=True, 
                timeout=15,
                shell=(sys.platform == "win32")
            )
            
            if result.returncode != 0:
                self.logger.warning(f"Could not list MCP servers: {result.stderr}")
                return False
            
            # Parse output to check if server is installed
            output = result.stdout.lower()
            return server_name.lower() in output
            
        except (subprocess.TimeoutExpired, subprocess.SubprocessError) as e:
            self.logger.warning(f"Error checking MCP server status: {e}")
            return False
    
    def _install_mcp_server(self, server_info: Dict[str, Any], config: Dict[str, Any]) -> bool:
        """Install a single MCP server"""
        server_name = server_info["name"]
        npm_package = server_info["npm_package"]
        
        # Get the command to use - either specified in server_info or default to npx format
        command = server_info.get("command", f"npx {npm_package}")
        
        try:
            self.logger.info(f"Installing MCP server: {server_name}")
            
            # Check if already installed
            if self._check_mcp_server_installed(server_name):
                self.logger.info(f"MCP server {server_name} already installed")
                return True
            
            # Handle API key requirements
            if "api_key_env" in server_info:
                api_key_env = server_info["api_key_env"]
                api_key_desc = server_info.get("api_key_description", f"API key for {server_name}")
                
                if not config.get("dry_run", False):
                    display_info(f"MCP server '{server_name}' requires an API key")
                    display_info(f"Environment variable: {api_key_env}")
                    display_info(f"Description: {api_key_desc}")
                    
                    # Check if API key is already set
                    import os
                    if not os.getenv(api_key_env):
                        display_warning(f"API key {api_key_env} not found in environment")
                        self.logger.warning(f"Proceeding without {api_key_env} - server may not function properly")
            
            # Install using Claude CLI
            if config.get("dry_run", False):
                self.logger.info(f"Would install MCP server (user scope): claude mcp add -s user {server_name} {command}")
                return True
            
            self.logger.debug(f"Running: claude mcp add -s user {server_name} {command}")
            
            result = subprocess.run(
                ["claude", "mcp", "add", "-s", "user", server_name, command],
                capture_output=True,
                text=True,
                timeout=120,  # 2 minutes timeout for installation
                shell=(sys.platform == "win32")
            )
            
            if result.returncode == 0:
                self.logger.success(f"Successfully installed MCP server (user scope): {server_name}")
                return True
            else:
                error_msg = result.stderr.strip() if result.stderr else "Unknown error"
                self.logger.error(f"Failed to install MCP server {server_name}: {error_msg}")
                return False
                
        except subprocess.TimeoutExpired:
            self.logger.error(f"Timeout installing MCP server {server_name}")
            return False
        except Exception as e:
            self.logger.error(f"Error installing MCP server {server_name}: {e}")
            return False
    
    def _uninstall_mcp_server(self, server_name: str) -> bool:
        """Uninstall a single MCP server"""
        try:
            self.logger.info(f"Uninstalling MCP server: {server_name}")
            
            # Check if installed
            if not self._check_mcp_server_installed(server_name):
                self.logger.info(f"MCP server {server_name} not installed")
                return True
            
            self.logger.debug(f"Running: claude mcp remove {server_name} (auto-detect scope)")
            
            result = subprocess.run(
                ["claude", "mcp", "remove", server_name],
                capture_output=True,
                text=True,
                timeout=60,
                shell=(sys.platform == "win32")
            )
            
            if result.returncode == 0:
                self.logger.success(f"Successfully uninstalled MCP server: {server_name}")
                return True
            else:
                error_msg = result.stderr.strip() if result.stderr else "Unknown error"
                self.logger.error(f"Failed to uninstall MCP server {server_name}: {error_msg}")
                return False
                
        except subprocess.TimeoutExpired:
            self.logger.error(f"Timeout uninstalling MCP server {server_name}")
            return False
        except Exception as e:
            self.logger.error(f"Error uninstalling MCP server {server_name}: {e}")
            return False
    
    def install(self, config: Dict[str, Any]) -> bool:
        """Install MCP component"""
        try:
            self.logger.info("Installing SuperClaude MCP servers...")
            
            # Validate prerequisites
            success, errors = self.validate_prerequisites()
            if not success:
                for error in errors:
                    self.logger.error(error)
                return False
            
            # Install each MCP server
            installed_count = 0
            failed_servers = []
            
            for server_name, server_info in self.mcp_servers.items():
                if self._install_mcp_server(server_info, config):
                    installed_count += 1
                else:
                    failed_servers.append(server_name)
                    
                    # Check if this is a required server
                    if server_info.get("required", False):
                        self.logger.error(f"Required MCP server {server_name} failed to install")
                        return False
            
            # Update metadata
            try:
                # Add component registration to metadata
                self.settings_manager.add_component_registration("mcp", {
                    "version": "3.0.0",
                    "category": "integration",
                    "servers_count": len(self.mcp_servers)
                })
                
                # Add MCP configuration to metadata
                metadata = self.settings_manager.load_metadata()
                metadata["mcp"] = {
                    "enabled": True,
                    "servers": list(self.mcp_servers.keys()),
                    "auto_update": False
                }
                self.settings_manager.save_metadata(metadata)
                
                self.logger.info("Updated metadata with MCP component registration")
            except Exception as e:
                self.logger.error(f"Failed to update metadata: {e}")
                return False
            
            # Verify installation
            if not config.get("dry_run", False):
                self.logger.info("Verifying MCP server installation...")
                try:
                    result = subprocess.run(
                        ["claude", "mcp", "list"],
                        capture_output=True,
                        text=True,
                        timeout=15,
                        shell=(sys.platform == "win32")
                    )
                    
                    if result.returncode == 0:
                        self.logger.debug("MCP servers list:")
                        for line in result.stdout.strip().split('\n'):
                            if line.strip():
                                self.logger.debug(f"  {line.strip()}")
                    else:
                        self.logger.warning("Could not verify MCP server installation")
                        
                except Exception as e:
                    self.logger.warning(f"Could not verify MCP installation: {e}")
            
            if failed_servers:
                self.logger.warning(f"Some MCP servers failed to install: {failed_servers}")
                self.logger.success(f"MCP component partially installed ({installed_count} servers)")
            else:
                self.logger.success(f"MCP component installed successfully ({installed_count} servers)")
            
            return True
            
        except Exception as e:
            self.logger.exception(f"Unexpected error during MCP installation: {e}")
            return False
    
    def uninstall(self) -> bool:
        """Uninstall MCP component"""
        try:
            self.logger.info("Uninstalling SuperClaude MCP servers...")
            
            # Uninstall each MCP server
            uninstalled_count = 0
            
            for server_name in self.mcp_servers.keys():
                if self._uninstall_mcp_server(server_name):
                    uninstalled_count += 1
            
            # Update metadata to remove MCP component
            try:
                if self.settings_manager.is_component_installed("mcp"):
                    self.settings_manager.remove_component_registration("mcp")
                    # Also remove MCP configuration from metadata
                    metadata = self.settings_manager.load_metadata()
                    if "mcp" in metadata:
                        del metadata["mcp"]
                        self.settings_manager.save_metadata(metadata)
                    self.logger.info("Removed MCP component from metadata")
            except Exception as e:
                self.logger.warning(f"Could not update metadata: {e}")
            
            self.logger.success(f"MCP component uninstalled ({uninstalled_count} servers removed)")
            return True
            
        except Exception as e:
            self.logger.exception(f"Unexpected error during MCP uninstallation: {e}")
            return False
    
    def get_dependencies(self) -> List[str]:
        """Get dependencies"""
        return ["core"]
    
    def update(self, config: Dict[str, Any]) -> bool:
        """Update MCP component"""
        try:
            self.logger.info("Updating SuperClaude MCP servers...")
            
            # Check current version
            current_version = self.settings_manager.get_component_version("mcp")
            target_version = self.get_metadata()["version"]
            
            if current_version == target_version:
                self.logger.info(f"MCP component already at version {target_version}")
                return True
            
            self.logger.info(f"Updating MCP component from {current_version} to {target_version}")
            
            # For MCP servers, update means reinstall to get latest versions
            updated_count = 0
            failed_servers = []
            
            for server_name, server_info in self.mcp_servers.items():
                try:
                    # Uninstall old version
                    if self._check_mcp_server_installed(server_name):
                        self._uninstall_mcp_server(server_name)
                    
                    # Install new version
                    if self._install_mcp_server(server_info, config):
                        updated_count += 1
                    else:
                        failed_servers.append(server_name)
                        
                except Exception as e:
                    self.logger.error(f"Error updating MCP server {server_name}: {e}")
                    failed_servers.append(server_name)
            
            # Update metadata
            try:
                # Update component version in metadata
                metadata = self.settings_manager.load_metadata()
                if "components" in metadata and "mcp" in metadata["components"]:
                    metadata["components"]["mcp"]["version"] = target_version
                    metadata["components"]["mcp"]["servers_count"] = len(self.mcp_servers)
                if "mcp" in metadata:
                    metadata["mcp"]["servers"] = list(self.mcp_servers.keys())
                self.settings_manager.save_metadata(metadata)
            except Exception as e:
                self.logger.warning(f"Could not update metadata: {e}")
            
            if failed_servers:
                self.logger.warning(f"Some MCP servers failed to update: {failed_servers}")
                return False
            else:
                self.logger.success(f"MCP component updated to version {target_version}")
                return True
            
        except Exception as e:
            self.logger.exception(f"Unexpected error during MCP update: {e}")
            return False
    
    def validate_installation(self) -> Tuple[bool, List[str]]:
        """Validate MCP component installation"""
        errors = []
        
        # Check metadata registration
        if not self.settings_manager.is_component_installed("mcp"):
            errors.append("MCP component not registered in metadata")
            return False, errors
        
        # Check version matches
        installed_version = self.settings_manager.get_component_version("mcp")
        expected_version = self.get_metadata()["version"]
        if installed_version != expected_version:
            errors.append(f"Version mismatch: installed {installed_version}, expected {expected_version}")
        
        # Check if Claude CLI is available
        try:
            result = subprocess.run(
                ["claude", "mcp", "list"],
                capture_output=True,
                text=True,
                timeout=15,
                shell=(sys.platform == "win32")
            )
            
            if result.returncode != 0:
                errors.append("Could not communicate with Claude CLI for MCP server verification")
            else:
                # Check if required servers are installed
                output = result.stdout.lower()
                for server_name, server_info in self.mcp_servers.items():
                    if server_info.get("required", False):
                        if server_name.lower() not in output:
                            errors.append(f"Required MCP server not found: {server_name}")
                            
        except Exception as e:
            errors.append(f"Could not verify MCP server installation: {e}")
        
        return len(errors) == 0, errors
    
    def get_size_estimate(self) -> int:
        """Get estimated installation size"""
        # MCP servers are installed via npm, estimate based on typical sizes
        base_size = 50 * 1024 * 1024  # ~50MB for all servers combined
        return base_size
    
    def get_installation_summary(self) -> Dict[str, Any]:
        """Get installation summary"""
        return {
            "component": self.get_metadata()["name"],
            "version": self.get_metadata()["version"],
            "servers_count": len(self.mcp_servers),
            "mcp_servers": list(self.mcp_servers.keys()),
            "estimated_size": self.get_size_estimate(),
            "dependencies": self.get_dependencies(),
            "required_tools": ["node", "npm", "claude"]
        }