XRPL for Game Developers

import { Client, Wallet, xrpToDrops } from 'xrpl';

class XRPLGameClient {
  constructor(serverUrl = 'wss://xrplcluster.com') {
    this.client = new Client(serverUrl);
    this.gameWallet = null;
    this.playerWallet = null;
  }

  async initialize(gameWalletSeed, playerWalletSeed) {
    await this.client.connect();
    this.gameWallet = Wallet.fromSeed(gameWalletSeed);
    this.playerWallet = Wallet.fromSeed(playerWalletSeed);
    
    // Verify account activation and funding
    await this.verifyAccountSetup();
  }

  async verifyAccountSetup() {
    const gameAccountInfo = await this.client.request({
      command: 'account_info',
      account: this.gameWallet.address
    });
    
    if (gameAccountInfo.result.account_data.Balance < xrpToDrops(100)) {
      throw new Error('Game wallet insufficient balance for operations');
    }
  }
}

class GameAccountManager {
  constructor(client) {
    this.client = client;
    this.accounts = {
      master: null,      // High-security, multi-sig
      operator: null,    // Daily operations
      treasury: null,    // Asset distribution
      rewards: null      // Automated payouts
    };
  }

  async setupAccountHierarchy() {
    // Configure master account with multi-signature
    await this.setupMultiSigMaster();
    
    // Setup operator accounts with spending limits
    await this.setupOperatorAccounts();
    
    // Configure automated reward distribution
    await this.setupRewardSystems();
  }

  async setupMultiSigMaster() {
    const signerListSet = {
      TransactionType: 'SignerListSet',
      Account: this.accounts.master.address,
      SignerQuorum: 3,
      SignerEntries: [
        { SignerEntry: { Account: 'rCEO...', SignerWeight: 2 }},
        { SignerEntry: { Account: 'rCTO...', SignerWeight: 2 }},
        { SignerEntry: { Account: 'rCFO...', SignerWeight: 1 }}
      ]
    };
    
    await this.submitTransaction(signerListSet, this.accounts.master);
  }
}

async setupPlayerAccount(playerWallet, gameTokenCurrency) {
  // Set up trust line for game token
  const trustSet = {
    TransactionType: 'TrustSet',
    Account: playerWallet.address,
    LimitAmount: {
      currency: gameTokenCurrency,
      issuer: this.accounts.treasury.address,
      value: '1000000' // Maximum trust limit
    }
  };
  
  await this.submitTransaction(trustSet, playerWallet);
  
  // Configure account settings for gaming
  const accountSet = {
    TransactionType: 'AccountSet',
    Account: playerWallet.address,
    SetFlag: 8, // RequireDest flag for additional security
    Domain: this.encodeGameDomain('game.xrpladder.com')
  };
  
  await this.submitTransaction(accountSet, playerWallet);
}

class PaymentChannelManager {
  constructor(client, gameWallet) {
    this.client = client;
    this.gameWallet = gameWallet;
    this.activeChannels = new Map();
  }

  async openPlayerChannel(playerAddress, channelAmount) {
    const channelCreate = {
      TransactionType: 'PaymentChannelCreate',
      Account: this.gameWallet.address,
      Destination: playerAddress,
      Amount: xrpToDrops(channelAmount),
      SettleDelay: 86400, // 24 hours
      PublicKey: this.gameWallet.publicKey
    };

    const result = await this.client.submitAndWait(channelCreate, {
      wallet: this.gameWallet
    });

    this.activeChannels.set(playerAddress, {
      channelId: result.result.hash,
      amount: channelAmount,
      balance: 0
    });

    return result.result.hash;
  }

  async processMicrotransaction(playerAddress, amount, itemId) {
    const channel = this.activeChannels.get(playerAddress);
    if (!channel) {
      throw new Error('No active payment channel for player');
    }

    channel.balance += amount;
    if (channel.balance > channel.amount) {
      throw new Error('Transaction exceeds channel capacity');
    }

    // Create signed claim for this transaction
    const claim = this.createChannelClaim(
      channel.channelId, 
      channel.balance,
      itemId
    );

    // Store claim for later settlement
    await this.storeChannelClaim(playerAddress, claim);
    
    return claim;
  }
}

async distributeRewards(rewardList) {
  // Group rewards by token type for optimization
  const groupedRewards = this.groupRewardsByToken(rewardList);
  
  for (const [tokenType, rewards] of groupedRewards) {
    const batchSize = 10; // XRPL memo limit consideration
    const batches = this.chunkArray(rewards, batchSize);
    
    for (const batch of batches) {
      await this.processBatchRewards(tokenType, batch);
    }
  }
}

async processBatchRewards(tokenType, rewards) {
  const payment = {
    TransactionType: 'Payment',
    Account: this.accounts.rewards.address,
    Destination: this.accounts.treasury.address, // Intermediate account
    Amount: '1', // Minimal XRP amount
    Memos: rewards.map(reward => ({
      Memo: {
        MemoType: this.encodeHex('REWARD'),
        MemoData: this.encodeHex(JSON.stringify({
          player: reward.playerAddress,
          amount: reward.amount,
          reason: reward.reason
        }))
      }
    }))
  };

  // Follow up with individual token distributions
  await this.processTokenDistribution(tokenType, rewards);
}

class GameStateManager {
  constructor(xrplClient) {
    this.xrplClient = xrplClient;
    this.pendingStates = new Map();
    this.checkpointInterval = 300000; // 5 minutes
    
    setInterval(() => this.processCheckpoint(), this.checkpointInterval);
  }

  async updatePlayerState(playerId, stateChange) {
    // Update local state immediately
    await this.updateLocalState(playerId, stateChange);
    
    // Queue for blockchain checkpoint if value-bearing
    if (this.isValueBearing(stateChange)) {
      this.queueBlockchainUpdate(playerId, stateChange);
    }
  }

  isValueBearing(stateChange) {
    return stateChange.type === 'asset_earned' || 
           stateChange.type === 'token_spent' ||
           stateChange.type === 'nft_acquired';
  }

  async processCheckpoint() {
    const pendingUpdates = Array.from(this.pendingStates.entries());
    if (pendingUpdates.length === 0) return;

    // Batch process all pending value-bearing state changes
    await this.batchProcessStateChanges(pendingUpdates);
    this.pendingStates.clear();
  }
}

class OnChainGameState {
  async updatePlayerStats(playerAddress, newStats) {
    const accountSet = {
      TransactionType: 'AccountSet',
      Account: playerAddress,
      Domain: this.encodeGameData({
        level: newStats.level,
        experience: newStats.experience,
        lastActive: Date.now()
      })
    };

    // Every stat update requires blockchain transaction
    await this.client.submitAndWait(accountSet, { wallet: playerWallet });
  }

  async recordGameAction(playerAddress, action) {
    const payment = {
      TransactionType: 'Payment',
      Account: playerAddress,
      Destination: this.gameAddress,
      Amount: '1',
      Memos: [{
        Memo: {
          MemoType: this.encodeHex('ACTION'),
          MemoData: this.encodeHex(JSON.stringify(action))
        }
      }]
    };

    await this.submitTransaction(payment, playerWallet);
  }
}

class HybridStateManager {
  constructor(xrplClient, gameDatabase) {
    this.xrplClient = xrplClient;
    this.gameDB = gameDatabase;
    this.syncQueue = [];
    this.syncInterval = 60000; // 1 minute
  }

  async handleGameAction(playerId, action) {
    switch (action.type) {
      case 'move_character':
      case 'cast_spell':
      case 'chat_message':
        // Off-chain only, immediate update
        return await this.updateOffChainState(playerId, action);
        
      case 'earn_token':
      case 'trade_item':
      case 'mint_nft':
        // Requires on-chain confirmation
        return await this.processOnChainAction(playerId, action);
        
      case 'level_up':
      case 'complete_quest':
        // Hybrid: immediate off-chain, queued on-chain
        await this.updateOffChainState(playerId, action);
        this.queueOnChainSync(playerId, action);
        return true;
    }
  }

  async processOnChainAction(playerId, action) {
    try {
      // Update off-chain state first
      await this.updateOffChainState(playerId, action);
      
      // Submit blockchain transaction
      const result = await this.submitBlockchainTransaction(action);
      
      // Confirm state consistency
      await this.verifyStateConsistency(playerId, action, result);
      
      return result;
    } catch (error) {
      // Rollback off-chain state on blockchain failure
      await this.rollbackOffChainState(playerId, action);
      throw error;
    }
  }
}

class EventSourcedGameState {
  constructor(xrplClient, eventStore) {
    this.xrplClient = xrplClient;
    this.eventStore = eventStore;
    this.checkpointEvents = new Set([
      'ASSET_EARNED', 'ASSET_TRADED', 'NFT_MINTED', 'TOURNAMENT_WIN'
    ]);
  }

  async processGameEvent(playerId, event) {
    // Store event in local event store
    const eventId = await this.eventStore.append(playerId, event);
    
    // Update derived state
    await this.updateProjectedState(playerId, event);
    
    // Checkpoint to blockchain if critical
    if (this.checkpointEvents.has(event.type)) {
      await this.checkpointToBlockchain(playerId, event, eventId);
    }
    
    return eventId;
  }

  async rebuildPlayerState(playerId, fromCheckpoint = null) {
    let events;
    if (fromCheckpoint) {
      // Start from last blockchain checkpoint
      const checkpointData = await this.getBlockchainCheckpoint(playerId);
      events = await this.eventStore.getEventsSince(playerId, checkpointData.eventId);
    } else {
      // Full rebuild from genesis
      events = await this.eventStore.getAllEvents(playerId);
    }
    
    // Replay events to rebuild current state
    let state = fromCheckpoint || this.getInitialState();
    for (const event of events) {
      state = this.applyEvent(state, event);
    }
    
    return state;
  }
}

class GameLogicServer {
  constructor(xrplManager, gameDatabase) {
    this.xrpl = xrplManager;
    this.db = gameDatabase;
    this.playerSessions = new Map();
  }

  async handlePlayerAction(sessionId, action) {
    const session = this.playerSessions.get(sessionId);
    if (!session) throw new Error('Invalid session');

    // Validate action against game rules
    const validation = await this.validateAction(session.playerId, action);
    if (!validation.valid) {
      return { success: false, error: validation.error };
    }

    // Process based on action type
    switch (action.type) {
      case 'MOVE_CHARACTER':
        return await this.processMovement(session, action);
      
      case 'ATTACK_MONSTER':
        return await this.processCombat(session, action);
      
      case 'CLAIM_REWARD':
        return await this.processRewardClaim(session, action);
      
      case 'TRADE_WITH_PLAYER':
        return await this.processPlayerTrade(session, action);
    }
  }

  async processRewardClaim(session, action) {
    // Update game state immediately
    const reward = await this.calculateReward(session.playerId, action.questId);
    await this.db.updatePlayerInventory(session.playerId, reward);

    // Queue blockchain transaction for valuable rewards
    if (reward.value > this.blockchainThreshold) {
      await this.xrpl.queueAssetTransfer(session.playerAddress, reward);
    }

    return { 
      success: true, 
      reward: reward,
      blockchainPending: reward.value > this.blockchainThreshold 
    };
  }
}

class XRPLValueLayer {
  constructor(config) {
    this.client = new Client(config.xrplServer);
    this.wallets = this.loadSecureWallets(config.walletConfig);
    this.transactionQueue = new PriorityQueue();
    this.rateLimiter = new RateLimiter({ requestsPerSecond: 10 });
  }

  async transferAsset(fromAddress, toAddress, asset) {
    // Validate transfer authorization
    await this.validateTransferAuthorization(fromAddress, toAddress, asset);

    // Queue transaction with appropriate priority
    const transaction = this.buildAssetTransfer(fromAddress, toAddress, asset);
    await this.transactionQueue.add(transaction, this.calculatePriority(asset));

    return await this.processTransactionQueue();
  }

  async validateTransferAuthorization(fromAddress, toAddress, asset) {
    // Check account balances
    const fromBalance = await this.getAccountBalance(fromAddress, asset.currency);
    if (fromBalance < asset.amount) {
      throw new Error('Insufficient balance for transfer');
    }

    // Verify trust lines for custom tokens
    if (asset.currency !== 'XRP') {
      const trustLine = await this.getTrustLine(toAddress, asset.currency);
      if (!trustLine || trustLine.limit < asset.amount) {
        throw new Error('Recipient trust line insufficient');
      }
    }

    // Check for any restrictions (escrow, freezing, etc.)
    await this.validateAccountRestrictions(fromAddress, toAddress);
  }
}

class InventoryMicroservice {
  constructor(xrplClient, inventoryDB) {
    this.xrpl = xrplClient;
    this.db = inventoryDB;
    this.syncManager = new InventorySyncManager();
  }

  async addItemToInventory(playerId, item) {
    // Immediate database update for gameplay
    await this.db.addItem(playerId, item);

    // Blockchain sync for valuable items
    if (this.isBlockchainWorthy(item)) {
      await this.syncManager.queueBlockchainUpdate(playerId, {
        action: 'ADD_ITEM',
        item: item,
        timestamp: Date.now()
      });
    }

    // Notify other services
    await this.publishInventoryEvent('ITEM_ADDED', { playerId, item });
  }

  isBlockchainWorthy(item) {
    return item.rarity >= 4 || // Epic or Legendary items
           item.tradeable === true || // Tradeable items
           item.value > 100; // High-value items
  }
}

class GameEventBus {
  constructor(xrplManager) {
    this.xrpl = xrplManager;
    this.subscribers = new Map();
    this.eventQueue = new EventQueue();
  }

  async publishEvent(eventType, eventData) {
    const event = {
      id: generateUUID(),
      type: eventType,
      data: eventData,
      timestamp: Date.now(),
      blockchainRequired: this.requiresBlockchain(eventType)
    };

    // Process immediately for gameplay
    await this.processEvent(event);

    // Queue for blockchain if needed
    if (event.blockchainRequired) {
      await this.xrpl.processGameEvent(event);
    }
  }

  requiresBlockchain(eventType) {
    const blockchainEvents = new Set([
      'ASSET_EARNED', 'ASSET_TRADED', 'NFT_MINTED', 
      'TOURNAMENT_COMPLETED', 'GUILD_TREASURY_UPDATED'
    ]);
    
    return blockchainEvents.has(eventType);
  }
}

class FeeOptimizationManager {
  constructor(xrplClient) {
    this.client = xrplClient;
    this.feeHistory = [];
    this.feeThresholds = {
      normal: 12,      // drops
      elevated: 50,    // drops  
      congested: 200   // drops
    };
  }

  async calculateOptimalFee(transaction) {
    const currentFee = await this.getCurrentFee();
    const transactionSize = this.estimateTransactionSize(transaction);
    
    // Add buffer for fee escalation during submission
    const bufferMultiplier = this.getFeeBufferMultiplier(currentFee);
    
    return Math.ceil(currentFee * transactionSize * bufferMultiplier);
  }

  getFeeBufferMultiplier(currentFee) {
    if (currentFee <= this.feeThresholds.normal) return 1.1;
    if (currentFee <= this.feeThresholds.elevated) return 1.3;
    return 1.5; // High congestion buffer
  }

  async shouldDelayTransaction(transaction, urgency) {
    const currentFee = await this.getCurrentFee();
    
    if (urgency === 'LOW' && currentFee > this.feeThresholds.elevated) {
      // Delay non-urgent transactions during congestion
      return true;
    }
    
    if (urgency === 'MEDIUM' && currentFee > this.feeThresholds.congested) {
      // Even medium-priority transactions should wait for extreme congestion
      return true;
    }
    
    return false; // HIGH urgency always proceeds
  }
}

class TransactionAggregator {
  constructor(xrplClient) {
    this.client = xrplClient;
    this.pendingOperations = new Map();
    this.aggregationTimeout = 30000; // 30 seconds
  }

  async queueOperation(operationType, operation) {
    if (!this.pendingOperations.has(operationType)) {
      this.pendingOperations.set(operationType, []);
      
      // Set timeout for this operation type
      setTimeout(() => {
        this.processAggregatedOperations(operationType);
      }, this.aggregationTimeout);
    }

    this.pendingOperations.get(operationType).push(operation);

    // Process immediately if batch is full
    if (this.pendingOperations.get(operationType).length >= this.getBatchSize(operationType)) {
      await this.processAggregatedOperations(operationType);
    }
  }

  getBatchSize(operationType) {
    const batchSizes = {
      'REWARD_DISTRIBUTION': 20,
      'NFT_MINTING': 10,
      'TOKEN_ISSUANCE': 15,
      'ACCOUNT_SETUP': 25
    };
    
    return batchSizes[operationType] || 10;
  }

  async processAggregatedOperations(operationType) {
    const operations = this.pendingOperations.get(operationType) || [];
    if (operations.length === 0) return;

    this.pendingOperations.delete(operationType);

    switch (operationType) {
      case 'REWARD_DISTRIBUTION':
        await this.processRewardBatch(operations);
        break;
      case 'NFT_MINTING':
        await this.processNFTBatch(operations);
        break;
      // ... other operation types
    }
  }
}

class ConditionalExecutionEngine {
  constructor(xrplManager) {
    this.xrpl = xrplManager;
    this.thresholds = this.loadExecutionThresholds();
    this.playerBehaviorData = new Map();
  }

  loadExecutionThresholds() {
    return {
      minimumValue: 0.1,        // USD equivalent
      playerActivityLevel: {
        casual: 1.0,            // Higher threshold for casual players
        regular: 0.5,           // Medium threshold for regular players
        hardcore: 0.1           // Lower threshold for engaged players
      },
      actionTypes: {
        'DAILY_REWARD': 0.05,
        'QUEST_COMPLETION': 0.25,
        'PVP_VICTORY': 0.50,
        'TOURNAMENT_WIN': 0.01, // Always execute
        'RARE_DROP': 0.01       // Always execute
      }
    };
  }

  async shouldExecuteOnChain(playerId, action, value) {
    const playerLevel = this.getPlayerActivityLevel(playerId);
    const actionThreshold = this.thresholds.actionTypes[action.type] || this.thresholds.minimumValue;
    const playerThreshold = this.thresholds.playerActivityLevel[playerLevel];

    const effectiveThreshold = Math.min(actionThreshold, playerThreshold);

    // Consider accumulated pending value
    const pendingValue = await this.getPendingValue(playerId);
    const totalValue = value + pendingValue;

    if (totalValue >= effectiveThreshold) {
      // Execute and clear pending value
      await this.clearPendingValue(playerId);
      return true;
    }

    // Accumulate for future execution
    await this.addToPendingValue(playerId, value);
    return false;
  }

  getPlayerActivityLevel(playerId) {
    const behaviorData = this.playerBehaviorData.get(playerId);
    if (!behaviorData) return 'casual';

    const dailyActions = behaviorData.actionsLast7Days / 7;
    const valueGenerated = behaviorData.valueGeneratedLast30Days;

    if (dailyActions > 50 && valueGenerated > 10) return 'hardcore';
    if (dailyActions > 20 && valueGenerated > 5) return 'regular';
    return 'casual';
  }
}

class GasPricePredictor {
  constructor(xrplClient) {
    this.client = xrplClient;
    this.feeHistory = [];
    this.networkMetrics = new Map();
  }

  async predictOptimalSubmissionTime(urgency, targetFee) {
    const currentFee = await this.getCurrentFee();
    
    if (currentFee <= targetFee) {
      return { shouldSubmit: true, estimatedWait: 0 };
    }

    if (urgency === 'HIGH') {
      return { shouldSubmit: true, estimatedWait: 0, warningFee: currentFee };
    }

    // Predict when fees will drop below target
    const prediction = await this.predictFeeDecline(targetFee);
    
    return {
      shouldSubmit: false,
      estimatedWait: prediction.timeMinutes,
      currentFee: currentFee,
      targetFee: targetFee,
      confidence: prediction.confidence
    };
  }

  async predictFeeDecline(targetFee) {
    const recentTrends = this.analyzeRecentFeeHistory();
    const networkActivity = await this.getNetworkActivityMetrics();
    
    // Simple prediction model (production would use more sophisticated ML)
    const trendFactor = recentTrends.isDecreasing ? 0.7 : 1.3;
    const activityFactor = networkActivity.txnVolume > networkActivity.avgVolume ? 1.5 : 0.8;
    
    const estimatedMinutes = Math.max(5, Math.min(180, 
      (targetFee / recentTrends.currentFee) * 60 * trendFactor * activityFactor
    ));

    return {
      timeMinutes: estimatedMinutes,
      confidence: this.calculatePredictionConfidence(recentTrends, networkActivity)
    };
  }
}