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// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {Owned} from "solmate/auth/Owned.sol";
import {IBitcoin} from "../interfaces/IBitcoin.sol";
import {DropBox} from "./DropBox.sol";

contract WrappedBitcoin is ERC20 {
    // =============================================================
    //                           ERRORS
    // =============================================================

    error DropBoxNotCreated(address owner);
    error DropBoxAlreadyExists(address owner);
    error DropBoxInsufficientBalance(address owner);
    error OwnerInsufficientBalance(address owner);

    // =============================================================
    //                           EVENTS
    // =============================================================

    event DropBoxCreated(address indexed owner);
    event Deposit(address indexed from, uint256 amount);
    event Withdrawal(address indexed to, uint256 amount);

    // =============================================================
    //                           CONSTANTS
    // =============================================================

    /// @dev The address of the underlying token.
    address private constant _UNDERLYING = address(0x853737186cb24D4152f979B9152F652b67F7e9b7);

    // =============================================================
    //                           STORAGE
    // =============================================================

    /// @notice The mapping of drop boxes.
    mapping(address => address) public dropBoxes;

    // =============================================================
    //                           CONSTRUCTOR
    // =============================================================

    constructor() ERC20("Wrapped Bitcoin", "WBTC", 8) {}

    // =============================================================
    //                           FUNCTIONS
    // =============================================================

    /// @notice Creates a drop box for the caller.
    function createDropBox() public {
        if (dropBoxes[msg.sender] != address(0)) revert DropBoxAlreadyExists(msg.sender);

        dropBoxes[msg.sender] = address(new DropBox(address(this)));

        emit DropBoxCreated(msg.sender);
    }

    /// @notice Deposits tokens into the wrapper.
    /// @param amount The amount of tokens to deposit.
    function deposit(uint256 amount) public {
        address dropBox = dropBoxes[msg.sender];

        if (dropBox == address(0)) revert DropBoxNotCreated(msg.sender);
        if (IBitcoin(_UNDERLYING).balanceOf(dropBox) < amount) revert DropBoxInsufficientBalance(msg.sender);

        _mint(msg.sender, amount);
        DropBox(dropBox).collect(amount, IBitcoin(_UNDERLYING));

        emit Deposit(msg.sender, amount);
    }

    /// @notice Withdraws tokens from the wrapper.
    /// @param amount The amount of tokens to withdraw.
    function withdraw(uint256 amount) public {
        if (balanceOf[msg.sender] < amount) revert OwnerInsufficientBalance(msg.sender);

        _burn(msg.sender, amount);
        IBitcoin(_UNDERLYING).transfer(msg.sender, amount);

        emit Withdrawal(msg.sender, amount);
    }

    /// @notice Returns the underlying token.
    function underlying() public pure returns (address) {
        return _UNDERLYING;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Simple single owner authorization mixin.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
abstract contract Owned {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

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

    /*//////////////////////////////////////////////////////////////
                            OWNERSHIP STORAGE
    //////////////////////////////////////////////////////////////*/

    address public owner;

    modifier onlyOwner() virtual {
        require(msg.sender == owner, "UNAUTHORIZED");

        _;
    }

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address _owner) {
        owner = _owner;

        emit OwnershipTransferred(address(0), _owner);
    }

    /*//////////////////////////////////////////////////////////////
                             OWNERSHIP LOGIC
    //////////////////////////////////////////////////////////////*/

    function transferOwnership(address newOwner) public virtual onlyOwner {
        owner = newOwner;

        emit OwnershipTransferred(msg.sender, newOwner);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

interface IBitcoin {
    function balanceOf(address owner) external returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function decimals() external returns (uint8);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

import {Owned} from "solmate/auth/Owned.sol";
import {IBitcoin} from "../interfaces/IBitcoin.sol";

contract DropBox is Owned {
    constructor(address owner_) Owned(owner_) {}

    function collect(uint256 value, IBitcoin underlying) public onlyOwner {
        underlying.transfer(owner, value);
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "libraries": {}
}

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uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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