package com.openosrs.client.core.bridge;

import net.runelite.api.Client;
import net.runelite.client.RuneLite;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

/**
 * ClientConnector - Handles connecting to an existing RuneLite client instance.
 * 
 * This class provides methods to locate and connect to a running RuneLite client,
 * enabling our modernized client to extract data from the actual game client.
 */
public class ClientConnector {
    private static final Logger logger = LoggerFactory.getLogger(ClientConnector.class);
    
    private static Client connectedClient;
    private static boolean searchInProgress = false;
    
    /**
     * Attempt to connect to an existing RuneLite client instance.
     * 
     * @return CompletableFuture that completes with the client instance or null if not found
     */
    public static CompletableFuture<Client> connectToRuneLiteClient() {
        if (connectedClient != null) {
            logger.info("Already connected to RuneLite client");
            return CompletableFuture.completedFuture(connectedClient);
        }
        
        if (searchInProgress) {
            logger.info("Client connection search already in progress");
            return CompletableFuture.completedFuture(null);
        }
        
        searchInProgress = true;
        
        return CompletableFuture.supplyAsync(() -> {
            try {
                logger.info("Searching for RuneLite client instance...");
                
                // Method 1: Try to get from static RuneLite instance
                Client client = tryGetFromRuneLiteStatic();
                if (client != null) {
                    logger.info("Connected to RuneLite client via static instance");
                    connectedClient = client;
                    return client;
                }
                
                // Method 2: Try to find via reflection in current JVM
                client = tryFindViaReflection();
                if (client != null) {
                    logger.info("Connected to RuneLite client via reflection");
                    connectedClient = client;
                    return client;
                }
                
                // Method 3: Try to start embedded RuneLite client
                client = tryStartEmbeddedClient();
                if (client != null) {
                    logger.info("Connected to embedded RuneLite client");
                    connectedClient = client;
                    return client;
                }
                
                logger.warn("Could not connect to any RuneLite client instance");
                return null;
                
            } catch (Exception e) {
                logger.error("Error connecting to RuneLite client", e);
                return null;
            } finally {
                searchInProgress = false;
            }
        });
    }
    
    /**
     * Try to get client from RuneLite static instance.
     */
    private static Client tryGetFromRuneLiteStatic() {
        try {
            // Look for RuneLite singleton or static client
            Class<?> runeLiteClass = Class.forName("net.runelite.client.RuneLite");
            
            // Try to find a static client field
            Field[] fields = runeLiteClass.getDeclaredFields();
            for (Field field : fields) {
                if (Client.class.isAssignableFrom(field.getType())) {
                    field.setAccessible(true);
                    Object value = field.get(null);
                    if (value instanceof Client) {
                        return (Client) value;
                    }
                }
            }
            
            // Try to find a getInstance method
            try {
                Method getInstanceMethod = runeLiteClass.getMethod("getInstance");
                Object instance = getInstanceMethod.invoke(null);
                
                if (instance != null) {
                    // Look for client field in the instance
                    Field[] instanceFields = instance.getClass().getDeclaredFields();
                    for (Field field : instanceFields) {
                        if (Client.class.isAssignableFrom(field.getType())) {
                            field.setAccessible(true);
                            Object value = field.get(instance);
                            if (value instanceof Client) {
                                return (Client) value;
                            }
                        }
                    }
                }
            } catch (NoSuchMethodException e) {
                // getInstance method doesn't exist, that's fine
            }
            
        } catch (Exception e) {
            logger.debug("Could not get client from RuneLite static: {}", e.getMessage());
        }
        
        return null;
    }
    
    /**
     * Try to find client via reflection search.
     */
    private static Client tryFindViaReflection() {
        try {
            // Search through all classes in the current classloader
            // This is a more aggressive search for any Client instances
            
            // Get the current thread's context class loader
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            
            // Look for any objects in memory that implement Client
            // This is a simplified approach - in practice you'd need more sophisticated
            // heap scanning or dependency injection framework integration
            
            logger.debug("Reflection-based client search not fully implemented yet");
            
        } catch (Exception e) {
            logger.debug("Could not find client via reflection: {}", e.getMessage());
        }
        
        return null;
    }
    
    /**
     * Try to start an embedded RuneLite client.
     */
    private static Client tryStartEmbeddedClient() {
        try {
            logger.info("Attempting to start embedded RuneLite client...");
            
            // This would require careful integration with RuneLite's startup process
            // For now, we'll just log that this is not implemented
            logger.warn("Embedded client startup not yet implemented");
            
            // In a full implementation, this would:
            // 1. Initialize RuneLite's dependency injection
            // 2. Start the game client
            // 3. Return the client instance
            
        } catch (Exception e) {
            logger.error("Could not start embedded client: {}", e.getMessage());
        }
        
        return null;
    }
    
    /**
     * Manually set the client instance (for testing or external integration).
     */
    public static void setClientInstance(Client client) {
        connectedClient = client;
        logger.info("Client instance manually set");
    }
    
    /**
     * Get the currently connected client.
     */
    public static Client getConnectedClient() {
        return connectedClient;
    }
    
    /**
     * Check if we're connected to a client.
     */
    public static boolean isConnected() {
        return connectedClient != null;
    }
    
    /**
     * Disconnect from the current client.
     */
    public static void disconnect() {
        if (connectedClient != null) {
            logger.info("Disconnecting from RuneLite client");
            connectedClient = null;
        }
    }
    
    /**
     * Wait for a client connection with timeout.
     */
    public static CompletableFuture<Client> waitForConnection(long timeoutSeconds) {
        return CompletableFuture.supplyAsync(() -> {
            long startTime = System.currentTimeMillis();
            long timeoutMs = timeoutSeconds * 1000;
            
            while (System.currentTimeMillis() - startTime < timeoutMs) {
                if (connectedClient != null) {
                    return connectedClient;
                }
                
                try {
                    Thread.sleep(500); // Check every 500ms
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    break;
                }
            }
            
            logger.warn("Timeout waiting for client connection after {} seconds", timeoutSeconds);
            return null;
        });
    }
}