contract Portal is IntentSource, Inbox, Semver {
    constructor() {}
}

function getIntentHash(
    Intent memory intent
) public pure returns (
    bytes32 intentHash,
    bytes32 routeHash,
    bytes32 rewardHash
) {
    routeHash = keccak256(abi.encode(intent.route));
    rewardHash = keccak256(abi.encode(intent.reward));
    intentHash = keccak256(
        abi.encodePacked(intent.destination, routeHash, rewardHash)
    );
}

function _fulfill(
    bytes32 intentHash,
    Route memory route,
    bytes32 rewardHash,
    bytes32 claimant
) internal returns (bytes[] memory) {
    // Validate intent hash
    bytes32 routeHash = keccak256(abi.encode(route));
    bytes32 computedIntentHash = keccak256(
        abi.encodePacked(CHAIN_ID, routeHash, rewardHash)
    );
    
    require(computedIntentHash == intentHash, "InvalidHash");
    require(claimants[intentHash] == bytes32(0), "AlreadyFulfilled");
    
    // Mark as fulfilled
    claimants[intentHash] = claimant;
    
    // Execute calls
    return executor.execute{value: route.nativeAmount}(route.calls);
}

function _getOrDeployVault(bytes32 intentHash) internal returns (address) {
    address vault = _getVault(intentHash);
    
    return vault.code.length > 0
        ? vault
        : VAULT_IMPLEMENTATION.clone(intentHash);
}

struct Intent {
    uint64 destination;     // Target chain ID
    Route route;           // Execution instructions
    Reward reward;         // Incentive structure
}

struct Route {
    bytes32 salt;              // Unique identifier
    uint64 deadline;           // Execution deadline
    address portal;            // Destination portal address
    uint256 nativeAmount;      // Native tokens to send
    TokenAmount[] tokens;      // ERC20 tokens needed
    Call[] calls;             // Contract calls to execute
}

struct Reward {
    uint64 deadline;           // Fulfillment deadline
    address creator;           // Intent creator
    address prover;            // Prover contract address
    uint256 nativeAmount;      // Native token reward
    TokenAmount[] tokens;      // ERC20 token rewards
}

struct Call {
    address target;    // Contract to call
    bytes data;        // ABI-encoded function data
    uint256 value;     // Native tokens to send
}