IERC20Mintable public token;      // Reward token (mintable)
address public daoAddress;         // DAO receives share of rewards
uint256 public daoShare;           // DAO share divisor
uint256 public bonusEndBlock;      // When 2x bonus ends
uint256 public rewardPerBlock;     // Tokens minted per block
uint256 public startBlock;         // When farming starts
uint256 public totalAllocPoint;    // Sum of all pool weights

struct PoolInfo {
    IERC20 lpToken;            // LP token to stake
    uint256 allocPoint;        // Pool weight
    uint256 lastRewardBlock;   // Last update block
    uint256 accRewardPerShare; // Accumulated rewards per share
}

struct UserInfo {
    uint256 amount;     // Staked LP tokens
    uint256 rewardDebt; // Reward debt for accounting
}

function deposit(uint256 _pid, uint256 _amount) public

function withdraw(uint256 _pid, uint256 _amount) public

function emergencyWithdraw(uint256 _pid) public

function pendingReward(uint256 _pid, address _user) external view returns (uint256)

function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner

function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner

uint256 public constant BONUS_MULTIPLIER = 2;

function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
    if (_to <= bonusEndBlock) {
        return (_to - _from) * BONUS_MULTIPLIER;
    } else if (_from >= bonusEndBlock) {
        return _to - _from;
    } else {
        return (bonusEndBlock - _from) * BONUS_MULTIPLIER + (_to - bonusEndBlock);
    }
}

import "@luxfi/standard/src/Farm.sol";

// Deploy farm
Farm farm = new Farm(
    daoAddress,
    10,              // DAO gets 1/10 of rewards
    rewardToken,
    1e18,            // 1 token per block
    startBlock,
    bonusEndBlock
);

// Add LP pool with 100 allocation points
farm.add(100, lpToken, true);

// User stakes LP tokens
lpToken.approve(address(farm), amount);
farm.deposit(0, amount);

// Check pending rewards
uint256 pending = farm.pendingReward(0, msg.sender);

// Withdraw and claim
farm.withdraw(0, amount);

event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);