import express from 'express';
import { WebSocketServer } from 'ws';
import cors from 'cors';
import { createServer } from 'http';
import * as db from './database.js';
import { Turtle } from './Turtle.js';

const app = express();
const PORT = 3001;
const WS_PORT = 3002;

app.use(cors());
app.use(express.json({ limit: '5mb' }));

// Initialize database
db.initializeDatabase();

// Load persisted data from database
console.log('📂 Loading persisted data from database...');
const savedHomes = db.getAllTurtleHomes();
const savedBlocks = db.getWorldBlocks();
console.log(`   Loaded ${savedHomes.length} turtle homes`);
console.log(`   Loaded ${savedBlocks.length} world blocks`);

// Store connected web clients and turtle data
const webClients = new Set();
const turtles = new Map(); // turtleID -> Turtle instance
const worldBlocks = new Map(); // "x,y,z" -> {name, metadata, discoveredBy, timestamp}
const turtleHomes = new Map(); // turtleID -> {x, y, z} home position
const turtleConfig = new Map(); // turtleID -> {maxDistance, facing, etc}

// Legacy compat: turtleData getter (returns serialized Turtle data)
const turtleData = {
  has(id) { return turtles.has(id); },
  get(id) { const t = turtles.get(id); return t ? t.toJSON() : undefined; },
  set(id, _val) { /* no-op, use getOrCreateTurtle */ },
  delete(id) { return turtles.delete(id); },
  get size() { return turtles.size; },
  entries() { return Array.from(turtles.entries()).map(([id, t]) => [id, t.toJSON()])[Symbol.iterator](); },
  values() { return Array.from(turtles.values()).map(t => t.toJSON())[Symbol.iterator](); },
  keys() { return turtles.keys(); },
};

// Load saved homes into memory
for (const home of savedHomes) {
  turtleHomes.set(home.turtle_id, { x: home.x, y: home.y, z: home.z });
}

// Load saved blocks into memory
for (const block of savedBlocks) {
  const key = `${block.x},${block.y},${block.z}`;
  worldBlocks.set(key, {
    name: block.block_name,
    metadata: block.metadata,
    discoveredBy: block.discovered_by,
    timestamp: block.discovered_at
  });
}

// Timeout for considering turtles offline (30 seconds)
const TURTLE_TIMEOUT = 30000;

// Broadcast to all web clients
function broadcastToClients(data) {
  const message = JSON.stringify(data);
  webClients.forEach((client) => {
    if (client.readyState === 1) { // OPEN
      client.send(message);
    }
  });
}

// ========== Turtle Instance Management ==========

/**
 * Get or create a Turtle instance for the given ID.
 * Wires up event handlers for the state machine and command forwarding.
 */
function getOrCreateTurtle(turtleID) {
  if (turtles.has(turtleID)) {
    return turtles.get(turtleID);
  }

  console.log(`✨ Creating Turtle instance for #${turtleID}`);
  const turtle = new Turtle(turtleID, {
    worldBlocks,
    broadcastToClients,
    storeBlock,
    db,
  });

  // Restore home position from DB
  const savedHome = turtleHomes.get(turtleID);
  if (savedHome) {
    turtle.homePosition = savedHome;
  }

  // ---- Event handlers ----

  // Forward eval commands to webbridge via pending command queue
  turtle.on('sendCommand', (command) => {
    // Queue eval command for webbridge to poll
    turtle.pendingLegacyCommands.push({
      ...command,
      timestamp: Date.now(),
    });
  });

  // Store discovered blocks
  turtle.on('blocksDiscovered', (blocks) => {
    for (const block of blocks) {
      storeBlock(block.x, block.y, block.z, { name: block.name, metadata: block.metadata }, block.discoveredBy);
    }
    // Broadcast blocks to web clients
    broadcastToClients({
      type: 'blocks_discovered',
      blocks: blocks.map(b => ({
        x: b.x, y: b.y, z: b.z,
        name: b.name,
        metadata: b.metadata,
        discoveredBy: b.discoveredBy,
        timestamp: Date.now(),
      })),
    });
  });

  // Broadcast turtle updates to web clients
  turtle.on('update', (data) => {
    broadcastToClients({
      type: 'turtle_update',
      turtle: data,
    });
  });

  // Handle turtle disconnect
  turtle.on('disconnect', (id) => {
    broadcastToClients({
      type: 'turtle_removed',
      turtleID: id,
    });
  });

  turtles.set(turtleID, turtle);
  return turtle;
}

// Cleanup stale turtles periodically
setInterval(() => {
  const now = Date.now();
  let removedCount = 0;
  
  for (const [turtleID, turtle] of turtles.entries()) {
    if (now - turtle.lastUpdate > TURTLE_TIMEOUT) {
      console.log(`🔌 Turtle ${turtleID} timed out (last seen ${Math.floor((now - turtle.lastUpdate) / 1000)}s ago)`);
      turtle.disconnect();
      turtles.delete(turtleID);
      removedCount++;
    }
  }
  
  if (removedCount > 0) {
    console.log(`🧹 Cleaned up ${removedCount} offline turtle(s)`);
  }
}, 10000); // Check every 10 seconds

// Helper to store discovered blocks
function storeBlock(x, y, z, blockData, turtleID) {
  const key = `${x},${y},${z}`;
  worldBlocks.set(key, {
    ...blockData,
    discoveredBy: turtleID,
    timestamp: Date.now()
  });
  
  // Persist to database
  db.saveWorldBlock(x, y, z, blockData.name, blockData.metadata, turtleID);
}

// Helper to calculate block position based on turtle position and facing
function getBlockPosition(turtlePos, facing, direction) {
  if (!turtlePos) return null;
  
  const pos = { ...turtlePos };
  
  if (direction === 'up') {
    pos.y += 1;
  } else if (direction === 'down') {
    pos.y -= 1;
  } else if (direction === 'forward') {
    if (facing === 0) pos.z -= 1; // North
    else if (facing === 1) pos.x += 1; // East
    else if (facing === 2) pos.z += 1; // South
    else if (facing === 3) pos.x -= 1; // West
  }
  
  return pos;
}

// Create HTTP server
const server = createServer(app);

// WebSocket server for web clients
const wss = new WebSocketServer({ port: WS_PORT });

console.log(`🚀 Turtle Control Server starting...`);
console.log(`📡 HTTP Server: http://localhost:${PORT}`);
console.log(`🔌 WebSocket Server: ws://localhost:${WS_PORT}`);

// WebSocket connection handler
wss.on('connection', (ws) => {
  console.log('🌐 New web client connected');
  webClients.add(ws);

  // Send current turtle data and world blocks to new client
  const blocks = [];
  for (const [key, blockData] of worldBlocks.entries()) {
    const [x, y, z] = key.split(',').map(Number);
    blocks.push({ x, y, z, ...blockData });
  }
  
  ws.send(JSON.stringify({
    type: 'initial_state',
    turtles: Array.from(turtles.values()).map(t => t.toJSON()),
    blocks: blocks
  }));

  ws.on('message', (message) => {
    try {
      const data = JSON.parse(message);
      console.log('📨 Received from web client:', data);

      // Handle commands from web client
      if (data.type === 'command') {
        const turtleID = data.turtleID;
        const turtle = turtles.get(turtleID);
        
        if (turtle) {
          // Check for state change commands
          if (data.command === 'set_state' || data.command === 'setState') {
            const stateName = data.param?.state || data.param;
            const stateData = data.param?.data || {};
            turtle.setState(stateName, stateData);
            console.log(`✅ State set for turtle ${turtleID}: ${stateName}`);
          } else {
            // Legacy command - queue for webbridge polling
            turtle.pendingLegacyCommands.push({
              command: data.command,
              param: data.param,
              timestamp: Date.now()
            });
            console.log(`✅ Command queued for turtle ${turtleID}: ${data.command}`, data.param ? `(param: ${JSON.stringify(data.param)})` : '');
          }
        } else {
          console.log(`❌ Turtle ${turtleID} not found`);
          console.log(`   Available turtles:`, Array.from(turtles.keys()));
        }
      }
    } catch (error) {
      console.error('❌ Error processing web client message:', error);
    }
  });

  ws.on('close', () => {
    console.log('👋 Web client disconnected');
    webClients.delete(ws);
  });

  ws.on('error', (error) => {
    console.error('❌ WebSocket error:', error);
  });
});

// REST API endpoint for turtles to update their status
app.post('/api/turtle/update', (req, res) => {
  try {
    const turtleUpdate = req.body;
    const turtleID = turtleUpdate.turtleID;

    console.log(`🐢 Status update from Turtle ${turtleID}`);

    // Get or create Turtle instance
    const turtle = getOrCreateTurtle(turtleID);
    
    // Update turtle from status data
    turtle.updateFromStatus(turtleUpdate);

    // Server's home takes precedence
    const serverHome = turtleHomes.get(turtleID);
    if (serverHome) {
      turtle.homePosition = serverHome;
    }
    
    // If turtle reports a home but server doesn't have one, store it
    if (turtleUpdate.homePosition && !serverHome) {
      turtleHomes.set(turtleID, turtleUpdate.homePosition);
      turtle.homePosition = turtleUpdate.homePosition;
      console.log(`  📍 Stored home position for turtle ${turtleID}:`, turtleUpdate.homePosition);
    }
    
    // Store discovered blocks in world map
    if (turtleUpdate.surroundings && turtleUpdate.position && turtleUpdate.facing !== undefined) {
      for (const [direction, blockData] of Object.entries(turtleUpdate.surroundings)) {
        const blockPos = getBlockPosition(turtleUpdate.position, turtleUpdate.facing, direction);
        if (blockPos) {
          storeBlock(blockPos.x, blockPos.y, blockPos.z, blockData, turtleID);
        }
      }
    }

    // Broadcast to web clients
    broadcastToClients({
      type: 'turtle_update',
      turtle: turtle.toJSON()
    });

    // Send back server-authoritative data
    res.json({ 
      success: true,
      homePosition: turtleHomes.get(turtleID),
      config: turtleConfig.get(turtleID) || {}
    });
  } catch (error) {
    console.error('❌ Error processing turtle update:', error);
    res.status(500).json({ error: error.message });
  }
});

// Endpoint for webbridge to poll for commands (includes eval + legacy)
app.get('/api/turtle/:id/commands', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const turtle = turtles.get(turtleID);

    if (turtle) {
      // Combine eval commands + legacy commands
      const commands = turtle.pendingLegacyCommands || [];
      
      // Clean up old commands (older than 30 seconds)
      const now = Date.now();
      turtle.pendingLegacyCommands = commands.filter(cmd => (now - cmd.timestamp) < 30000);
      
      if (turtle.pendingLegacyCommands.length > 0) {
        console.log(`📤 Sending ${turtle.pendingLegacyCommands.length} command(s) to turtle ${turtleID}`);
        turtle.pendingLegacyCommands.forEach(cmd => {
          if (cmd.type === 'eval') {
            console.log(`   - EVAL ${(cmd.uuid || '').substring(0, 8)}`);
          } else {
            console.log(`   - ${cmd.command}`, cmd.param ? `(${JSON.stringify(cmd.param)})` : '');
          }
        });
      }
      
      res.json({ commands: turtle.pendingLegacyCommands });
    } else {
      res.json({ commands: [] });
    }
  } catch (error) {
    console.error('❌ Error getting commands:', error);
    res.status(500).json({ error: error.message });
  }
});

// Acknowledge commands were delivered (clears them)
app.post('/api/turtle/:id/commands/ack', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const turtle = turtles.get(turtleID);
    
    if (turtle) {
      const clearedCount = (turtle.pendingLegacyCommands || []).length;
      
      if (clearedCount > 0) {
        console.log(`✅ Turtle ${turtleID} acknowledged ${clearedCount} command(s)`);
        turtle.pendingLegacyCommands = [];
      }
      
      res.json({ success: true, cleared: clearedCount });
    } else {
      res.status(404).json({ error: 'Turtle not found' });
    }
  } catch (error) {
    console.error('❌ Error acknowledging commands:', error);
    res.status(500).json({ error: error.message });
  }
});

// Receive real-time events from turtles (inventory, peripherals)
app.post('/api/turtle/event', (req, res) => {
  try {
    const { turtleID, type, message } = req.body;
    
    if (!turtleID || !type) {
      return res.status(400).json({ error: 'Missing turtleID or type' });
    }

    const turtle = turtles.get(turtleID);
    if (turtle) {
      turtle.handleEvent(type, message);
      console.log(`📡 Event from T#${turtleID}: ${type}`);
    }

    res.json({ success: true });
  } catch (error) {
    console.error('❌ Error processing turtle event:', error);
    res.status(500).json({ error: error.message });
  }
});

// Get all turtles
app.get('/api/turtles', (req, res) => {
  res.json({
    turtles: Array.from(turtles.values()).map(t => t.toJSON())
  });
});

// Set home position for a turtle
app.post('/api/turtle/:id/home', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const { position } = req.body;
    
    if (!position || position.x === undefined || position.y === undefined || position.z === undefined) {
      return res.status(400).json({ error: 'Invalid position' });
    }
    
    turtleHomes.set(turtleID, position);
    console.log(`📍 Set home for turtle ${turtleID}:`, position);
    
    // Persist to database
    db.saveTurtleHome(turtleID, position);
    
    // Update turtle instance
    const turtle = turtles.get(turtleID);
    if (turtle) {
      turtle.homePosition = position;
      
      // Broadcast update
      broadcastToClients({
        type: 'turtle_update',
        turtle: turtle.toJSON()
      });
    }
    
    res.json({ success: true, homePosition: position });
  } catch (error) {
    console.error('❌ Error setting home:', error);
    res.status(500).json({ error: error.message });
  }
});

// Get turtle home position
app.get('/api/turtle/:id/home', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const home = turtleHomes.get(turtleID);
    
    res.json({ 
      success: true, 
      homePosition: home || null 
    });
  } catch (error) {
    console.error('❌ Error getting home:', error);
    res.status(500).json({ error: error.message });
  }
});

// Get world blocks for map visualization
app.get('/api/world/blocks', (req, res) => {
  const blocks = [];
  for (const [key, blockData] of worldBlocks.entries()) {
    const [x, y, z] = key.split(',').map(Number);
    blocks.push({
      x, y, z,
      ...blockData
    });
  }
  res.json({ blocks });
});

// Store a discovered block
app.post('/api/world/blocks', (req, res) => {
  try {
    const { x, y, z, blockName, metadata, discoveredBy } = req.body;
    
    if (x === undefined || y === undefined || z === undefined || !blockName) {
      return res.status(400).json({ error: 'Missing required fields: x, y, z, blockName' });
    }
    
    const blockData = { name: blockName, metadata: metadata || 0 };
    storeBlock(x, y, z, blockData, discoveredBy);
    
    // Broadcast to web clients
    broadcastToClients({
      type: 'block_discovered',
      block: { x, y, z, name: blockName, metadata: metadata || 0, discoveredBy, timestamp: Date.now() }
    });
    
    res.json({ success: true });
  } catch (error) {
    console.error('❌ Error storing block:', error);
    res.status(500).json({ error: error.message });
  }
});

// Send command to turtle
app.post('/api/turtle/:id/command', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const { command, param } = req.body;
    const turtle = turtles.get(turtleID);

    if (turtle) {
      // Check for state change commands
      if (command === 'set_state' || command === 'setState') {
        const stateName = param?.state || param;
        const stateData = param?.data || {};
        turtle.setState(stateName, stateData);
        console.log(`📤 State set for turtle ${turtleID}: ${stateName}`);
      } else {
        // Legacy command - queue for webbridge
        turtle.pendingLegacyCommands.push({
          command,
          param,
          timestamp: Date.now()
        });
        console.log(`📤 Command queued for turtle ${turtleID}:`, command);
      }
      res.json({ success: true });
    } else {
      res.status(404).json({ error: 'Turtle not found' });
    }
  } catch (error) {
    console.error('❌ Error sending command:', error);
    res.status(500).json({ error: error.message });
  }
});

// ========== EVAL PROTOCOL ENDPOINTS ==========

// Receive eval response from webbridge (turtle -> webbridge -> server)
app.post('/api/turtle/eval-response', (req, res) => {
  try {
    const { turtleID, uuid, result, error } = req.body;
    
    if (!turtleID || !uuid) {
      return res.status(400).json({ error: 'Missing turtleID or uuid' });
    }

    const turtle = turtles.get(turtleID);
    if (turtle) {
      const handled = turtle.handleResponse(uuid, result, error);
      if (handled) {
        console.log(`📩 Eval response from T#${turtleID} uuid:${uuid.substring(0, 8)} - resolved`);
      } else {
        console.log(`📩 Eval response from T#${turtleID} uuid:${uuid.substring(0, 8)} - no matching pending command`);
      }
    } else {
      console.log(`📩 Eval response from unknown turtle ${turtleID}`);
    }

    res.json({ success: true });
  } catch (error) {
    console.error('❌ Error processing eval response:', error);
    res.status(500).json({ error: error.message });
  }
});

// Set turtle state (state machine control)
app.post('/api/turtle/:id/state', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const { state, data } = req.body;
    
    if (!state) {
      return res.status(400).json({ error: 'Missing state name' });
    }

    const turtle = turtles.get(turtleID);
    if (turtle) {
      turtle.setState(state, data || {});
      console.log(`🔄 State set for turtle ${turtleID}: ${state}`);
      res.json({ success: true, state: turtle.stateName, description: turtle.stateDescription });
    } else {
      res.status(404).json({ error: 'Turtle not found' });
    }
  } catch (error) {
    console.error('❌ Error setting state:', error);
    res.status(500).json({ error: error.message });
  }
});

// Get turtle state
app.get('/api/turtle/:id/state', (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const turtle = turtles.get(turtleID);
    
    if (turtle) {
      res.json({
        state: turtle.stateName,
        description: turtle.stateDescription,
        turtleID,
      });
    } else {
      res.status(404).json({ error: 'Turtle not found' });
    }
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Execute Lua code on a turtle directly (for debugging/admin)
app.post('/api/turtle/:id/exec', async (req, res) => {
  try {
    const turtleID = parseInt(req.params.id);
    const { code, timeout } = req.body;
    
    if (!code) {
      return res.status(400).json({ error: 'Missing code' });
    }

    const turtle = turtles.get(turtleID);
    if (!turtle) {
      return res.status(404).json({ error: 'Turtle not found' });
    }

    const result = await turtle.exec(code, timeout || 30000);
    res.json({ success: true, result });
  } catch (error) {
    console.error(`❌ Exec error for turtle ${req.params.id}:`, error.message);
    res.json({ success: false, error: error.message });
  }
});

// Bulk blocks discovery (from webbridge batch uploads)
app.post('/api/world/blocks/batch', (req, res) => {
  try {
    const { blocks, turtleID } = req.body;
    
    if (!Array.isArray(blocks)) {
      return res.status(400).json({ error: 'blocks must be an array' });
    }

    let stored = 0;
    for (const block of blocks) {
      if (block.x !== undefined && block.y !== undefined && block.z !== undefined && block.name) {
        storeBlock(block.x, block.y, block.z, { name: block.name, metadata: block.metadata || 0 }, turtleID || block.discoveredBy);
        stored++;
      }
    }

    // Broadcast to web clients
    if (stored > 0) {
      broadcastToClients({
        type: 'blocks_discovered',
        blocks: blocks.filter(b => b.x !== undefined && b.name).map(b => ({
          x: b.x, y: b.y, z: b.z,
          name: b.name,
          metadata: b.metadata || 0,
          discoveredBy: turtleID || b.discoveredBy,
          timestamp: Date.now(),
        })),
      });
    }

    res.json({ success: true, stored });
  } catch (error) {
    console.error('❌ Error batch storing blocks:', error);
    res.status(500).json({ error: error.message });
  }
});

// ========== PATH RECORDING ENDPOINTS ==========

// Save a recorded path
app.post('/api/paths', (req, res) => {
  try {
    const { turtleId, pathName, pathData } = req.body;
    const pathId = db.savePath(turtleId, pathName, pathData || []);
    res.json({ success: true, pathId, message: 'Path saved' });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get all paths (optionally filtered by turtleId)
app.get('/api/paths', (req, res) => {
  try {
    const paths = db.getPaths();
    res.json(paths.map(p => ({
      pathId: p.id,
      turtleId: p.turtle_id,
      name: p.path_name,
      pathData: p.path_data,
      waypointCount: Array.isArray(p.path_data) ? p.path_data.length : 0,
      createdAt: p.created_at,
      updatedAt: p.updated_at
    })));
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get paths for a specific turtle
app.get('/api/paths/turtle/:turtleId', (req, res) => {
  try {
    const turtleId = parseInt(req.params.turtleId);
    const paths = db.getPaths(turtleId);
    res.json(paths.map(p => ({
      pathId: p.id,
      turtleId: p.turtle_id,
      name: p.path_name,
      pathData: p.path_data,
      waypointCount: Array.isArray(p.path_data) ? p.path_data.length : 0,
      createdAt: p.created_at,
      updatedAt: p.updated_at
    })));
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get a specific path with full details
app.get('/api/paths/:pathId', (req, res) => {
  try {
    const pathId = parseInt(req.params.pathId);
    const path = db.getPath(pathId);
    if (!path) {
      return res.status(404).json({ error: 'Path not found' });
    }
    res.json({
      pathId: path.id,
      turtleId: path.turtle_id,
      name: path.path_name,
      waypoints: path.path_data,
      createdAt: path.created_at,
      updatedAt: path.updated_at
    });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Delete a path
app.delete('/api/paths/:pathId', (req, res) => {
  try {
    const pathId = parseInt(req.params.pathId);
    db.deletePath(pathId);
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// ========== TASK QUEUE ENDPOINTS ==========

// Create a new task
app.post('/api/tasks', (req, res) => {
  try {
    const { taskType, priority, assignedTurtleId, parameters } = req.body;
    const taskData = parameters || {};
    const taskId = db.createTask(taskType, taskData, priority || 0, assignedTurtleId || null);
    
    broadcastToClients({
      type: 'task_created',
      taskId,
      taskType,
      priority
    });
    
    res.json({ success: true, taskId });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get all tasks (with optional status filter)
app.get('/api/tasks', (req, res) => {
  try {
    const status = req.query.status || null;
    const rawTasks = db.getAllTasks(status);
    const tasks = rawTasks.map(t => ({
      taskId: t.id,
      taskType: t.task_type,
      priority: t.priority,
      status: t.status,
      assignedTurtleId: t.assigned_turtle_id,
      parameters: t.task_data,
      result: t.task_data?.result || null,
      createdAt: t.created_at,
      updatedAt: t.updated_at
    }));
    res.json(tasks);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get next available task
app.get('/api/tasks/next', (req, res) => {
  try {
    const task = db.getNextTask();
    res.json({ task });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Update task status
app.put('/api/tasks/:taskId', (req, res) => {
  try {
    const taskId = parseInt(req.params.taskId);
    const { status, result } = req.body;
    db.updateTaskStatus(taskId, status, result);
    
    broadcastToClients({
      type: 'task_updated',
      taskId,
      status
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Delete a task
app.delete('/api/tasks/:taskId', (req, res) => {
  try {
    const taskId = parseInt(req.params.taskId);
    db.deleteTask(taskId);
    
    broadcastToClients({
      type: 'task_deleted',
      taskId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Assign task to turtle
app.post('/api/tasks/:taskId/assign', (req, res) => {
  try {
    const taskId = parseInt(req.params.taskId);
    const { turtleId } = req.body;
    db.assignTask(taskId, turtleId);
    
    broadcastToClients({
      type: 'task_assigned',
      taskId,
      turtleId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Complete a task
app.post('/api/tasks/:taskId/complete', (req, res) => {
  try {
    const taskId = parseInt(req.params.taskId);
    db.completeTask(taskId);
    
    broadcastToClients({
      type: 'task_completed',
      taskId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// ========== MINING AREA ENDPOINTS ==========

// Helper to format mining area for API response
function formatMiningArea(area) {
  return {
    areaID: area.id,
    turtleID: area.turtle_id,
    startX: area.min_x,
    startY: area.min_y,
    startZ: area.min_z,
    endX: area.max_x,
    endY: area.max_y,
    endZ: area.max_z,
    status: area.status,
    createdAt: area.created_at,
    updatedAt: area.updated_at
  };
}

// Save a mining area
app.post('/api/mining-areas', (req, res) => {
  try {
    const { turtleId, turtleID, bounds, startX, startY, startZ, endX, endY, endZ, areaName, status } = req.body;
    const tid = turtleId || turtleID;
    
    // Support both {turtleId, bounds} and flat {startX,startY,...} formats
    const areaBounds = bounds || {
      minX: Math.min(Number(startX), Number(endX)),
      minY: Math.min(Number(startY), Number(endY)),
      minZ: Math.min(Number(startZ), Number(endZ)),
      maxX: Math.max(Number(startX), Number(endX)),
      maxY: Math.max(Number(startY), Number(endY)),
      maxZ: Math.max(Number(startZ), Number(endZ))
    };
    
    db.saveMiningArea(tid, areaBounds, areaName || null, status || 'planned');
    
    const areas = db.getMiningAreas();
    broadcastToClients({
      type: 'mining_areas_updated',
      areas: areas.map(formatMiningArea)
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get all mining areas
app.get('/api/mining-areas', (req, res) => {
  try {
    const areas = db.getMiningAreas();
    res.json(areas.map(formatMiningArea));
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Update mining area status
app.put('/api/mining-areas/:areaId', (req, res) => {
  try {
    const areaId = parseInt(req.params.areaId);
    const { status } = req.body;
    db.updateMiningAreaStatus(areaId, status);
    
    const areas = db.getMiningAreas();
    broadcastToClients({
      type: 'mining_areas_updated',
      areas: areas.map(formatMiningArea)
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Delete a mining area
app.delete('/api/mining-areas/:areaId', (req, res) => {
  try {
    const areaId = parseInt(req.params.areaId);
    db.deleteMiningArea(areaId);
    
    const areas = db.getMiningAreas();
    broadcastToClients({
      type: 'mining_areas_updated',
      areas: areas.map(formatMiningArea)
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Close a mining area (legacy endpoint)
app.post('/api/mining-areas/:areaId/close', (req, res) => {
  try {
    const areaId = parseInt(req.params.areaId);
    db.closeMiningArea(areaId);
    
    const areas = db.getMiningAreas();
    broadcastToClients({
      type: 'mining_areas_updated',
      areas: areas.map(formatMiningArea)
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// ========== CHUNK ANALYSIS ENDPOINTS ==========

// Get all chunk analyses
app.get('/api/chunks', (req, res) => {
  try {
    const chunks = db.getAllChunkAnalyses();
    res.json(chunks);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get specific chunk analysis
app.get('/api/chunks/:x/:z', (req, res) => {
  try {
    const x = parseInt(req.params.x);
    const z = parseInt(req.params.z);
    const chunk = db.getChunkAnalysis(x, z);
    res.json(chunk || { x, z, analysis: {} });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Save chunk analysis
app.post('/api/chunks', (req, res) => {
  try {
    const { x, z, analysis } = req.body;
    db.saveChunkAnalysis(x, z, analysis || {});
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Search blocks by name pattern in area
app.get('/api/world/blocks/search', (req, res) => {
  try {
    const { fromX, fromY, fromZ, toX, toY, toZ, pattern } = req.query;
    if (!pattern) {
      return res.status(400).json({ error: 'Missing pattern parameter' });
    }
    const blocks = db.getBlocksWithNameLike(
      parseInt(fromX) || -1000, parseInt(fromY) || -64, parseInt(fromZ) || -1000,
      parseInt(toX) || 1000, parseInt(toY) || 320, parseInt(toZ) || 1000,
      pattern
    );
    res.json({ blocks });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get single block info
app.get('/api/world/block/:x/:y/:z', (req, res) => {
  try {
    const x = parseInt(req.params.x);
    const y = parseInt(req.params.y);
    const z = parseInt(req.params.z);
    const block = db.getBlock(x, y, z);
    res.json(block || null);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// ========== STATISTICS ENDPOINTS ==========

// Get server statistics
app.get('/api/stats', (req, res) => {
  try {
    const stats = {
      activeTurtles: turtles.size,
      turtles: turtles.size,
      totalBlocks: worldBlocks.size,
      blocks: worldBlocks.size,
      savedHomes: turtleHomes.size,
      connectedClients: webClients.size,
      tasks: db.getAllTasks().length,
      miningAreas: db.getMiningAreas().length,
      groups: db.getAllGroups().length
    };
    res.json(stats);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get mining statistics
app.get('/api/stats/mining/:turtleId?', (req, res) => {
  try {
    const turtleId = req.params.turtleId ? parseInt(req.params.turtleId) : null;
    const days = parseInt(req.query.days) || 7;
    const stats = db.getMiningStats(turtleId, days);
    
    if (turtleId) {
      // Single turtle: return { turtleId, blocks: [{blockType, count}] }
      res.json({
        turtleId,
        blocks: stats.map(s => ({ blockType: s.block_type, count: s.total_count }))
      });
    } else {
      // All turtles: group by turtle_id, return array of { turtleId, blocks: [...] }
      const grouped = {};
      stats.forEach(s => {
        if (!grouped[s.turtle_id]) {
          grouped[s.turtle_id] = { turtleId: s.turtle_id, blocks: [] };
        }
        grouped[s.turtle_id].blocks.push({ blockType: s.block_type, count: s.total_count });
      });
      res.json(Object.values(grouped));
    }
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get top miners leaderboard
app.get('/api/stats/top-miners', (req, res) => {
  try {
    const limit = parseInt(req.query.limit) || 10;
    const topMiners = db.getTopMiners(limit);
    res.json(topMiners.map(m => ({
      turtleId: m.turtle_id,
      totalBlocks: m.total_blocks,
      uniqueTypes: m.unique_types
    })));
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Record block mined (called by turtles)
app.post('/api/stats/block-mined', (req, res) => {
  try {
    const { turtleId, blockType } = req.body;
    db.recordBlockMined(turtleId, blockType);
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// ========== TURTLE GROUPS/TEAMS ENDPOINTS ==========

// Helper to format group for API response
function formatGroup(group, members) {
  return {
    groupId: group.id,
    groupName: group.group_name,
    color: group.color,
    memberCount: members.length,
    members: members.map(m => ({ turtleId: m.turtle_id, joinedAt: m.joined_at })),
    createdAt: group.created_at
  };
}

// Create a new group
app.post('/api/groups', (req, res) => {
  try {
    const { groupName, color } = req.body;
    const groupId = db.createGroup(groupName, color);
    
    broadcastToClients({
      type: 'group_created',
      groupId,
      groupName,
      color
    });
    
    res.json({ success: true, groupId });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get all groups
app.get('/api/groups', (req, res) => {
  try {
    const groups = db.getAllGroups();
    const result = groups.map(group => {
      const members = db.getGroupMembers(group.id);
      return formatGroup(group, members);
    });
    res.json(result);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Delete a group
app.delete('/api/groups/:groupId', (req, res) => {
  try {
    const groupId = parseInt(req.params.groupId);
    db.deleteGroup(groupId);
    
    broadcastToClients({
      type: 'group_deleted',
      groupId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Add turtle to group
app.post('/api/groups/:groupId/members', (req, res) => {
  try {
    const groupId = parseInt(req.params.groupId);
    const { turtleId } = req.body;
    db.addTurtleToGroup(turtleId, groupId);
    
    broadcastToClients({
      type: 'turtle_added_to_group',
      groupId,
      turtleId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Remove turtle from group
app.delete('/api/groups/:groupId/members/:turtleId', (req, res) => {
  try {
    const groupId = parseInt(req.params.groupId);
    const turtleId = parseInt(req.params.turtleId);
    db.removeTurtleFromGroup(turtleId, groupId);
    
    broadcastToClients({
      type: 'turtle_removed_from_group',
      groupId,
      turtleId
    });
    
    res.json({ success: true });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Get turtle's groups
app.get('/api/turtles/:turtleId/groups', (req, res) => {
  try {
    const turtleId = parseInt(req.params.turtleId);
    const groups = db.getTurtleGroups(turtleId);
    res.json({ groups });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Send command to all turtles in a group
app.post('/api/groups/:groupId/command', (req, res) => {
  try {
    const groupId = parseInt(req.params.groupId);
    const { command, param } = req.body;
    const members = db.getGroupMembers(groupId);
    
    let successCount = 0;
    for (const member of members) {
      const turtle = turtles.get(member.turtle_id);
      if (turtle) {
        if (command === 'set_state' || command === 'setState') {
          const stateName = param?.state || param;
          const stateData = param?.data || {};
          turtle.setState(stateName, stateData);
        } else {
          turtle.pendingLegacyCommands.push({
            command,
            param,
            timestamp: Date.now()
          });
        }
        successCount++;
      }
    }
    
    res.json({ success: true, sentTo: successCount });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Player position endpoints
app.post('/api/player/update', (req, res) => {
  try {
    const { playerID, position, timestamp } = req.body;
    
    if (!playerID || !position) {
      return res.status(400).json({ error: 'Missing playerID or position' });
    }

    db.savePlayerPosition(playerID, position);
    
    // Broadcast to WebSocket clients
    broadcastToClients({
      type: 'player_update',
      playerID,
      position,
      timestamp: timestamp || Date.now()
    });

    res.json({ success: true, playerID, position });
  } catch (error) {
    console.error('Error updating player position:', error);
    res.status(500).json({ error: error.message });
  }
});

app.get('/api/players', (req, res) => {
  try {
    const players = db.getAllPlayerPositions();
    res.json(players);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

app.get('/api/player/:id', (req, res) => {
  try {
    const playerId = parseInt(req.params.id);
    const player = db.getPlayerPosition(playerId);
    
    if (!player) {
      return res.status(404).json({ error: 'Player not found' });
    }
    
    res.json(player);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Graceful shutdown
process.on('SIGINT', () => {
  console.log('\n🛑 Shutting down server...');
  db.closeDatabase();
  process.exit(0);
});

server.listen(PORT, () => {
  console.log(`✅ Server ready!`);
  console.log(`\nConfigured turtles to send updates to:`);
  console.log(`  http://localhost:${PORT}/api/turtle/update`);
});