loyalty card

adpoint.dart

import 'package:web3dart/web3dart.dart';

// Assume that the contract address and ABI are stored in variables
// called 'contractAddress' and 'contractAbi', respectively

// Create a new instance of the EthereumClient class
final client = Web3Client(rpcUrl, httpClient: httpClient);

// Load the contract using the contract address and ABI
final contract = DeployedContract(
  ContractAbi.fromJson(contractAbi, 'LoyaltyCard'),
  EthereumAddress.fromHex(contractAddress),
);

// Create a function call request to call the 'addPoints' function
final request = contract.function('addPoints').call(
  // Pass the member's address and the number of points to add as arguments
  [memberAddress, pointsToAdd],
);

// Send the request to the Ethereum network
final result = await client.sendTransaction(
  Transaction.callContract(
    contract: contract,
    function: request,
    // Set the maximum amount of gas to use
    maxGas: 1000000,
  ),
  // Sign the transaction using the private key of the account sending the transaction
  credentials,
);

// Check the result of the transaction to see if it was successful
if (result.status == TransactionReceiptStatus.success) {
  print('Transaction was successful');
} else {
  print('Transaction failed');
}

loyalty_card.sol

pragma solidity ^0.7.0;

// Define the contract
contract LoyaltyCard {
  // Define a struct to store the data for each member
  struct Member {
    string name;
    uint points;
  }

  // Define a mapping to store the data for each member
  mapping (address => Member) public members;

  // Define a function to add points to a member's balance
  function addPoints(address _member, uint _points) public {
    // Retrieve the member's data from the mapping
    Member storage member = members[_member];
    // Add the points to the member's balance
    member.points += _points;
  }

  // Define a function to redeem points for a reward
  function redeemPoints(address _member, uint _points) public {
    // Retrieve the member's data from the mapping
    Member storage member = members[_member];
    // Ensure the member has enough points to redeem
    require(member.points >= _points, "Not enough points to redeem");
    // Subtract the points from the member's balance
    member.points -= _points;
  }
}

multiple_cards_loyalty.sol

pragma solidity ^0.7.0;

// Define the contract
contract LoyaltyCard {
  // Define a struct to represent a loyalty card
  struct Card {
    string name;
    uint points;
  }

  // Define a struct to store the data for each member
  struct Member {
    address owner;
    Card[] cards;
  }

  // Define a mapping to store the data for each member
  mapping (address => Member) public members;

  // Define a function to add a new loyalty card for a member
  function addCard(address _member, string _name) public {
    // Retrieve the member's data from the mapping
    Member storage member = members[_member];
    // Create a new loyalty card for the member
    Card memory card = Card(_name, 0);
    // Add the card to the member's array of cards
    member.cards.push(card);
  }

  // Define a function to add points to a member's loyalty card
  function addPoints(address _member, uint _cardIndex, uint _points) public {
    // Retrieve the member's data from the mapping
    Member storage member = members[_member];
    // Retrieve the specified loyalty card from the member's array of cards
    Card storage card = member.cards[_cardIndex];
    // Add the points to the card's balance
    card.points += _points;
  }

  // Define a function to redeem points for a reward
  function redeemPoints(address _member, uint _cardIndex, uint _points) public {
    // Retrieve the member's data from the mapping
    Member storage member = members[_member];
    // Retrieve the specified loyalty card from the member's array of cards
    Card storage card = member.cards[_cardIndex];
    // Ensure the card has enough points to redeem
    require(card.points >= _points, "Not enough points to redeem");
    // Subtract the points from the card's balance
    card.points -= _points;
  }
}

redeem.dart

import 'package:web3dart/web3dart.dart';

// Assume that the contract address and ABI are stored in variables
// called 'contractAddress' and 'contractAbi', respectively

// Create a new instance of the EthereumClient class
final client = Web3Client(rpcUrl, httpClient: httpClient);

// Load the contract using the contract address and ABI
final contract = DeployedContract(
  ContractAbi.fromJson(contractAbi, 'LoyaltyCard'),
  EthereumAddress.fromHex(contractAddress),
);

// Create a function call request to call the 'redeemPoints' function
final request = contract.function('redeemPoints').call(
  // Pass the member's address and the number of points to redeem as arguments
  [memberAddress, pointsToRedeem],
);

// Send the request to the Ethereum network
final result = await client.sendTransaction(
  Transaction.callContract(
    contract: contract,
    function: request,
    // Set the maximum amount of gas to use
    maxGas: 1000000,
  ),
  // Sign the transaction using the private key of the account sending the transaction
  credentials,
);

// Check the result of the transaction to see if it was successful
if (result.status == TransactionReceiptStatus.success) {
  print('Transaction was successful');
} else {
  print('Transaction failed');
}