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

// From:
// https://github.com/erc6551/reference/blob/main/src/ERC6551Registry.sol

import "@openzeppelin/contracts/utils/Create2.sol";

import "./interfaces/IERC6551Registry.sol";
import "./lib/ERC6551Bytecode.sol";

contract PackRegistry is IERC6551Registry {
    error AccountCreationFailed();

    function createAccount(
        address implementation,
        uint256 chainId,
        address tokenContract,
        uint256 tokenId,
        uint256 salt,
        bytes calldata initData
    ) external returns (address) {
        bytes memory code = ERC6551BytecodeLib.getCreationCode(
            implementation,
            chainId,
            tokenContract,
            tokenId,
            salt
        );

        address _account = Create2.computeAddress(
            bytes32(salt),
            keccak256(code)
        );

        if (_account.code.length != 0) return _account;

        emit AccountCreated(
            _account,
            implementation,
            chainId,
            tokenContract,
            tokenId,
            salt
        );

        assembly {
            _account := create2(0, add(code, 0x20), mload(code), salt)
        }

        if (_account == address(0)) revert AccountCreationFailed();

        if (initData.length != 0) {
            (bool success, bytes memory result) = _account.call(initData);

            if (!success) {
                assembly {
                    revert(add(result, 32), mload(result))
                }
            }
        }

        return _account;
    }

    function account(
        address implementation,
        uint256 chainId,
        address tokenContract,
        uint256 tokenId,
        uint256 salt
    ) external view returns (address) {
        bytes32 bytecodeHash = keccak256(
            ERC6551BytecodeLib.getCreationCode(
                implementation,
                chainId,
                tokenContract,
                tokenId,
                salt
            )
        );

        return Create2.computeAddress(bytes32(salt), bytecodeHash);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Create2.sol)

pragma solidity ^0.8.20;

/**
 * @dev Helper to make usage of the `CREATE2` EVM opcode easier and safer.
 * `CREATE2` can be used to compute in advance the address where a smart
 * contract will be deployed, which allows for interesting new mechanisms known
 * as 'counterfactual interactions'.
 *
 * See the https://eips.ethereum.org/EIPS/eip-1014#motivation[EIP] for more
 * information.
 */
library Create2 {
    /**
     * @dev Not enough balance for performing a CREATE2 deploy.
     */
    error Create2InsufficientBalance(uint256 balance, uint256 needed);

    /**
     * @dev There's no code to deploy.
     */
    error Create2EmptyBytecode();

    /**
     * @dev The deployment failed.
     */
    error Create2FailedDeployment();

    /**
     * @dev Deploys a contract using `CREATE2`. The address where the contract
     * will be deployed can be known in advance via {computeAddress}.
     *
     * The bytecode for a contract can be obtained from Solidity with
     * `type(contractName).creationCode`.
     *
     * Requirements:
     *
     * - `bytecode` must not be empty.
     * - `salt` must have not been used for `bytecode` already.
     * - the factory must have a balance of at least `amount`.
     * - if `amount` is non-zero, `bytecode` must have a `payable` constructor.
     */
    function deploy(uint256 amount, bytes32 salt, bytes memory bytecode) internal returns (address addr) {
        if (address(this).balance < amount) {
            revert Create2InsufficientBalance(address(this).balance, amount);
        }
        if (bytecode.length == 0) {
            revert Create2EmptyBytecode();
        }
        /// @solidity memory-safe-assembly
        assembly {
            addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt)
        }
        if (addr == address(0)) {
            revert Create2FailedDeployment();
        }
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy}. Any change in the
     * `bytecodeHash` or `salt` will result in a new destination address.
     */
    function computeAddress(bytes32 salt, bytes32 bytecodeHash) internal view returns (address) {
        return computeAddress(salt, bytecodeHash, address(this));
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy} from a contract located at
     * `deployer`. If `deployer` is this contract's address, returns the same value as {computeAddress}.
     */
    function computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) internal pure returns (address addr) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40) // Get free memory pointer

            // |                   | ↓ ptr ...  ↓ ptr + 0x0B (start) ...  ↓ ptr + 0x20 ...  ↓ ptr + 0x40 ...   |
            // |-------------------|---------------------------------------------------------------------------|
            // | bytecodeHash      |                                                        CCCCCCCCCCCCC...CC |
            // | salt              |                                      BBBBBBBBBBBBB...BB                   |
            // | deployer          | 000000...0000AAAAAAAAAAAAAAAAAAA...AA                                     |
            // | 0xFF              |            FF                                                             |
            // |-------------------|---------------------------------------------------------------------------|
            // | memory            | 000000...00FFAAAAAAAAAAAAAAAAAAA...AABBBBBBBBBBBBB...BBCCCCCCCCCCCCC...CC |
            // | keccak(start, 85) |            ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑ |

            mstore(add(ptr, 0x40), bytecodeHash)
            mstore(add(ptr, 0x20), salt)
            mstore(ptr, deployer) // Right-aligned with 12 preceding garbage bytes
            let start := add(ptr, 0x0b) // The hashed data starts at the final garbage byte which we will set to 0xff
            mstore8(start, 0xff)
            addr := keccak256(start, 85)
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC6551Registry {
    /**
     * @dev The registry SHALL emit the AccountCreated event upon successful account creation
     */
    event AccountCreated(
        address account,
        address indexed implementation,
        uint256 chainId,
        address indexed tokenContract,
        uint256 indexed tokenId,
        uint256 salt
    );

    /**
     * @dev Creates a token bound account for a non-fungible token
     *
     * If account has already been created, returns the account address without calling create2
     *
     * If initData is not empty and account has not yet been created, calls account with
     * provided initData after creation
     *
     * Emits AccountCreated event
     *
     * @return the address of the account
     */
    function createAccount(
        address implementation,
        uint256 chainId,
        address tokenContract,
        uint256 tokenId,
        uint256 seed,
        bytes calldata initData
    ) external returns (address);

    /**
     * @dev Returns the computed token bound account address for a non-fungible token
     *
     * @return The computed address of the token bound account
     */
    function account(
        address implementation,
        uint256 chainId,
        address tokenContract,
        uint256 tokenId,
        uint256 salt
    ) external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// From:
// https://github.com/erc6551/reference/blob/main/src/lib/ERC6551BytecodeLib.sol

library ERC6551BytecodeLib {
    function getCreationCode(
        address implementation_,
        uint256 chainId_,
        address tokenContract_,
        uint256 tokenId_,
        uint256 salt_
    ) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                hex"3d60ad80600a3d3981f3363d3d373d3d3d363d73",
                implementation_,
                hex"5af43d82803e903d91602b57fd5bf3",
                abi.encode(salt_, chainId_, tokenContract_, tokenId_)
            );
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"name":"AccountCreationFailed","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"implementation","type":"address"},{"indexed":false,"internalType":"uint256","name":"chainId","type":"uint256"},{"indexed":true,"internalType":"address","name":"tokenContract","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"salt","type":"uint256"}],"name":"AccountCreated","type":"event"},{"inputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"salt","type":"uint256"}],"name":"account","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"bytes","name":"initData","type":"bytes"}],"name":"createAccount","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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