/**
 * Quantum Randomness Oracle - JavaScript Client SDK
 */

class QuantumRandomnessClient {
  /**
   * Initialize the client
   * @param {string} rpcUrl - Blockchain RPC URL
   * @param {string} contractAddress - Oracle contract address
   * @param {string} privateKey - Optional private key for transactions
   */
  constructor(rpcUrl, contractAddress, privateKey = null) {
    // Note: In a real implementation, you'd use web3.js or ethers.js
    this.rpcUrl = rpcUrl;
    this.contractAddress = contractAddress;
    this.privateKey = privateKey;
    
    // In a real implementation, initialize web3 provider and contract
    // this.web3 = new Web3(rpcUrl);
    // this.contract = new this.web3.eth.Contract(abi, contractAddress);
  }
  
  /**
   * Get the current fee for requesting randomness
   * @returns {Promise<string>} Fee in wei
   */
  async getRequestFee() {
    // In a real implementation:
    // return await this.contract.methods.fee().call();
    
    // Mock implementation
    return Promise.resolve("10000000000000000"); // 0.01 ETH in wei
  }
  
  /**
   * Request randomness from the oracle
   * @param {string} value - Amount to send with the request (in wei)
   * @returns {Promise<number>} Request ID
   */
  async requestRandomness(value = null) {
    if (!this.privateKey) {
      throw new Error("Private key required for sending transactions");
    }
    
    const fee = await this.getRequestFee();
    const sendValue = value || fee;
    
    // In a real implementation:
    // const accounts = await this.web3.eth.getAccounts();
    // const result = await this.contract.methods.requestRandomness().send({
    //   from: accounts[0],
    //   value: sendValue,
    //   gas: 200000
    // });
    // return result.events.RandomnessRequested.returnValues.requestId;
    
    // Mock implementation returning a dummy request ID
    return Math.floor(Math.random() * 1000000);
  }
  
  /**
   * Get the status of a randomness request
   * @param {number} requestId - Request ID to check
   * @returns {Promise<Object>} Request status
   */
  async getRequestStatus(requestId) {
    // In a real implementation:
    // return await this.contract.methods.getRequest(requestId).call();
    
    // Mock implementation
    return Promise.resolve({
      requestId: requestId,
      requester: "0x0000000000000000000000000000000000000000",
      fee: "10000000000000000",
      commitment: "0x0000000000000000000000000000000000000000000000000000000000000000",
      blockNumber: 1234567,
      fulfilled: false,
      randomness: null,
      timestamp: Math.floor(Date.now() / 1000)
    });
  }
  
  /**
   * Check if a request is fulfilled
   * @param {number} requestId - Request ID to check
   * @returns {Promise<boolean>} True if fulfilled
   */
  async isRequestFulfilled(requestId) {
    const status = await this.getRequestStatus(requestId);
    return status.fulfilled;
  }
  
  /**
   * Wait for a request to be fulfilled
   * @param {number} requestId - Request ID to wait for
   * @param {number} timeout - Timeout in seconds (default 300)
   * @returns {Promise<Object>} Request status when fulfilled
   */
  async waitForFulfillment(requestId, timeout = 300) {
    const startTime = Date.now();
    const interval = 5000; // 5 seconds between checks
    
    while ((Date.now() - startTime) < timeout * 1000) {
      const status = await this.getRequestStatus(requestId);
      if (status.fulfilled) {
        return status;
      }
      
      await new Promise(resolve => setTimeout(resolve, interval));
    }
    
    throw new Error(`Request ${requestId} not fulfilled within ${timeout} seconds`);
  }
}

// Example usage
async function main() {
  console.log("Quantum Randomness Oracle Client Demo");
  console.log("=".repeat(40));
  
  // Initialize client
  const client = new QuantumRandomnessClient(
    "http://localhost:8545",  // Replace with actual RPC URL
    "0x0000000000000000000000000000000000000000"  // Replace with actual contract address
  );
  
  try {
    // Get the current request fee
    const fee = await client.getRequestFee();
    console.log(`Current request fee: ${fee} wei`);
    
    // Request randomness (this would require a real contract and funds)
    // const requestId = await client.requestRandomness();
    // console.log(`Requested randomness with ID: ${requestId}`);
    
    // Check status of a request
    // const status = await client.getRequestStatus(requestId);
    // console.log(`Request status:`, status);
    
    console.log("Client initialized successfully!");
  } catch (error) {
    console.log(`Demo error (expected without real contract): ${error.message}`);
  }
}

// Export for use in other modules
if (typeof module !== 'undefined' && module.exports) {
  module.exports = QuantumRandomnessClient;
}

// Run demo if this file is executed directly
if (typeof window === 'undefined' && require.main === module) {
  main();
}