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

pragma solidity 0.5.10;

contract ImmutableCreate2FactoryAuto {
    mapping(address => bool) private _deployed;

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

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

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

        // Build simple randomized init code (a tiny contract returning seed % 1e18)
        // This bytecode = runtime code of a contract returning a fixed value.
        bytes memory initCode = abi.encodePacked(
            hex"600a600c600039600a6000f3", // deploy + return runtime code
            hex"602a60005260206000f3",   // runtime: push random value & return
            bytes32(seed)               // random constant
        );

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

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

        // Perform CREATE2 with gas cap
        assembly {
            let encoded_data := add(0x20, initCode)
            let encoded_size := mload(initCode)
            deploymentAddress := create2(
                callvalue,
                encoded_data,
                encoded_size,
                salt
            )
        }

        require(
            deploymentAddress == targetDeploymentAddress,
            "CREATE2 failed"
        );

        _deployed[deploymentAddress] = true;
        emit Deployed(deploymentAddress, salt, seed);
    }

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

    function findCreate2AddressAuto()
        external
        view
        returns (address predicted)
    {
        uint256 seed = uint256(
            keccak256(
                abi.encodePacked(
                    msg.sender,
                    block.number,
                    address(this)
                )
            )
        );
        bytes32 salt = keccak256(abi.encodePacked(seed, msg.sender));
        bytes memory initCode = abi.encodePacked(
            hex"600a600c600039600a6000f3",
            hex"602a60005260206000f3",
            bytes32(seed)
        );
        predicted = address(
            uint160(
                uint256(
                    keccak256(
                        abi.encodePacked(
                            hex"ff",
                            address(this),
                            salt,
                            keccak256(abi.encodePacked(initCode))
                        )
                    )
                )
            )
        );
        if (_deployed[predicted]) return address(0);
    }
}

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[{"constant":true,"inputs":[{"name":"a","type":"address"}],"name":"hasBeenDeployed","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"findCreate2AddressAuto","outputs":[{"name":"predicted","type":"address"}],"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"}],"name":"Deployed","type":"event"}]

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bzzr://9728f66b03bdf6ad60de37e1bda1edea33cb602789739d9f0ca2e08c6d054dd7