// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity 0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

contract PillRewards is Ownable {
    IERC20 public immutable token;
    
    mapping(address => uint256) public tier;
    mapping(address => bool) public claimedOrBurned;

    uint256 public constant DECIMALS = 18;
    uint256 public constant tier1 = 500000 * (10 ** DECIMALS);
    uint256 public constant tier2 = 250000 * (10 ** DECIMALS);
    uint256 public constant tier3 = 50000 * (10 ** DECIMALS);

    uint256 public constant threshold = 69000 * (10 ** DECIMALS);
    
    error TheLengthDoesNotMatch();
    error YourTierIsZero();
    error TheBalanceIsLessThanThreshold();
    error HaveYouAlreadyUsedClaimOrBurn();

    event Claim(address indexed holder, uint256 tier);
    event Burn(address indexed holder, uint256 tier);

    constructor(address _token) {
        token = IERC20(_token);
    }

    function claim() external {
        uint256 balance = token.balanceOf(msg.sender);
        uint256 _tier = tier[msg.sender];
        uint256 amount;

        if(_tier == 0) revert YourTierIsZero();
        if(balance < threshold) revert TheBalanceIsLessThanThreshold();
        if(claimedOrBurned[msg.sender]) revert HaveYouAlreadyUsedClaimOrBurn();
        
        if(_tier == 1) {
            amount = tier1;
        } else if(_tier == 2) {
            amount = tier2;
        } else {
            amount = tier3;
        }
        claimedOrBurned[msg.sender] = true;
        token.transfer(msg.sender, amount);

        emit Claim(msg.sender, amount);
    }

    function burn() external {
        uint256 balance = token.balanceOf(msg.sender);
        uint256 _tier = tier[msg.sender];
        uint256 amount;
        uint256 halfAmount;

        if(_tier == 0) revert YourTierIsZero();
        if(balance < threshold) revert TheBalanceIsLessThanThreshold();
        if(claimedOrBurned[msg.sender]) revert HaveYouAlreadyUsedClaimOrBurn();

        if(_tier == 1) {
            amount = tier1;
        } else if(_tier == 2) {
            amount = tier2;
        } else {
            amount = tier3;
        }
        halfAmount = amount / 2;
    
        claimedOrBurned[msg.sender] = true;
        token.transfer(msg.sender, halfAmount);
        token.transfer(0x8b8E219439bd31761A81333ae1dd041376EC22C8, halfAmount);
       
        emit Burn(msg.sender, halfAmount);
    }

    function setWhitelist(address[] calldata holders, uint256[] calldata tiers) external onlyOwner {
        if(holders.length != tiers.length) {
            revert TheLengthDoesNotMatch();
        }

        uint256 length = holders.length;

        for(uint256 i; i < length; ) {
            tier[holders[i]] = tiers[i];

            unchecked {
                ++i;
            }
        }
    }

    function withdrawTokens() external onlyOwner {
        uint256 balance = token.balanceOf(address(this));
        token.transfer(msg.sender, balance);
    }
}

{
  "compilationTarget": {
    "src/PillRewards.sol": "PillRewards"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@openzeppelin/=node_modules/@openzeppelin/",
    ":forge-std/=lib/forge-std/src/"
  ]
}