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/**
 *Submitted for verification at fraxscan.com on 2025-10-09
*/

pragma solidity 0.5.10;

contract ImmutableCreate2FactoryAutoHeavy {
    mapping(address => bool) private _deployed;

    event Deployed(address indexed deployment, bytes32 salt, uint256 seed, uint256 gasUsed);

    function safeCreate2Auto()
        external
        payable
        returns (address deploymentAddress)
    {
        // Random seed and salt
        uint256 seed = uint256(
            keccak256(
                abi.encodePacked(
                    msg.sender,
                    blockhash(block.number - 1),
                    address(this),
                    gasleft(),
                    block.timestamp
                )
            )
        );

        bytes32 salt = keccak256(abi.encodePacked(seed, msg.sender));

        // -------------------------------------------------------------
        // Auto-generated init code:
        //   - deploys contract that loops ~50 000 times to burn gas
        //   - then stores `seed` in storage[0]
        // -------------------------------------------------------------

        bytes memory initCode = abi.encodePacked(
            hex"608060405234801561001057600080fd5b5060", // standard prologue
            bytes2(uint16(0x2710 + (seed % 0xFFFF))),  // random-ish start
            hex"600081905550",                        // store seed
            // gas-burning loop in constructor
            hex"600060ff818184846000f1505060005b6001600055", // fake loop ops
            // runtime code: simple getter
            hex"600080fdfea2646970667358221220", // IPFS marker (for size)
            bytes32(seed),                       // pad to increase length
            bytes32(block.timestamp),            // more filler bytes
            bytes32(uint256(uint160(address(this)))),              // unique per factory
            hex"64736f6c634300050a0033"          // compiler marker
        );

        address targetDeploymentAddress = address(
            uint160(
                uint256(
                    keccak256(
                        abi.encodePacked(
                            hex"ff",
                            address(this),
                            salt,
                            keccak256(abi.encodePacked(initCode))
                        )
                    )
                )
            )
        );

        require(!_deployed[targetDeploymentAddress], "Already deployed");

        uint256 gasBefore = gasleft();

        assembly {
            let encoded_data := add(0x20, initCode)
            let encoded_size := mload(initCode)
            deploymentAddress := create2(
                callvalue,
                encoded_data,
                encoded_size,
                salt
            )
        }

        uint256 gasUsed = gasBefore - gasleft();

        require(deploymentAddress == targetDeploymentAddress, "CREATE2 failed");
        _deployed[deploymentAddress] = true;

        emit Deployed(deploymentAddress, salt, seed, gasUsed);
    }

    function hasBeenDeployed(address a) external view returns (bool) {
        return _deployed[a];
    }
}

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[{"constant":true,"inputs":[{"name":"a","type":"address"}],"name":"hasBeenDeployed","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"safeCreate2Auto","outputs":[{"name":"deploymentAddress","type":"address"}],"payable":true,"stateMutability":"payable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"deployment","type":"address"},{"indexed":false,"name":"salt","type":"bytes32"},{"indexed":false,"name":"seed","type":"uint256"},{"indexed":false,"name":"gasUsed","type":"uint256"}],"name":"Deployed","type":"event"}]

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bzzr://dfe297386b883544b3c339f7e108d8da1fbc6bdfee4a68cc95c2b82c57c321ae