// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.9.0;

import "./console2.sol";

abstract contract StdUtils {
    uint256 private constant UINT256_MAX =
        115792089237316195423570985008687907853269984665640564039457584007913129639935;

    function _bound(uint256 x, uint256 min, uint256 max) internal pure virtual returns (uint256 result) {
        require(min <= max, "StdUtils bound(uint256,uint256,uint256): Max is less than min.");

        // If x is between min and max, return x directly. This is to ensure that dictionary values
        // do not get shifted if the min is nonzero. More info: https://github.com/foundry-rs/forge-std/issues/188
        if (x >= min && x <= max) return x;

        uint256 size = max - min + 1;

        // If the value is 0, 1, 2, 3, warp that to min, min+1, min+2, min+3. Similarly for the UINT256_MAX side.
        // This helps ensure coverage of the min/max values.
        if (x <= 3 && size > x) return min + x;
        if (x >= UINT256_MAX - 3 && size > UINT256_MAX - x) return max - (UINT256_MAX - x);

        // Otherwise, wrap x into the range [min, max], i.e. the range is inclusive.
        if (x > max) {
            uint256 diff = x - max;
            uint256 rem = diff % size;
            if (rem == 0) return max;
            result = min + rem - 1;
        } else if (x < max) {
            uint256 diff = min - x;
            uint256 rem = diff % size;
            if (rem == 0) return min;
            result = max - rem + 1;
        }
    }

    function bound(uint256 x, uint256 min, uint256 max) internal view virtual returns (uint256 result) {
        result = _bound(x, min, max);
        console2.log("Bound Result", result);
    }

    /// @dev Compute the address a contract will be deployed at for a given deployer address and nonce
    /// @notice adapated from Solmate implementation (https://github.com/Rari-Capital/solmate/blob/main/src/utils/LibRLP.sol)
    function computeCreateAddress(address deployer, uint256 nonce) internal pure virtual returns (address) {
        // forgefmt: disable-start
        // The integer zero is treated as an empty byte string, and as a result it only has a length prefix, 0x80, computed via 0x80 + 0.
        // A one byte integer uses its own value as its length prefix, there is no additional "0x80 + length" prefix that comes before it.
        if (nonce == 0x00)      return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd6), bytes1(0x94), deployer, bytes1(0x80))));
        if (nonce <= 0x7f)      return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd6), bytes1(0x94), deployer, uint8(nonce))));

        // Nonces greater than 1 byte all follow a consistent encoding scheme, where each value is preceded by a prefix of 0x80 + length.
        if (nonce <= 2**8 - 1)  return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd7), bytes1(0x94), deployer, bytes1(0x81), uint8(nonce))));
        if (nonce <= 2**16 - 1) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd8), bytes1(0x94), deployer, bytes1(0x82), uint16(nonce))));
        if (nonce <= 2**24 - 1) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd9), bytes1(0x94), deployer, bytes1(0x83), uint24(nonce))));
        // forgefmt: disable-end

        // More details about RLP encoding can be found here: https://eth.wiki/fundamentals/rlp
        // 0xda = 0xc0 (short RLP prefix) + 0x16 (length of: 0x94 ++ proxy ++ 0x84 ++ nonce)
        // 0x94 = 0x80 + 0x14 (0x14 = the length of an address, 20 bytes, in hex)
        // 0x84 = 0x80 + 0x04 (0x04 = the bytes length of the nonce, 4 bytes, in hex)
        // We assume nobody can have a nonce large enough to require more than 32 bytes.
        return addressFromLast20Bytes(
            keccak256(abi.encodePacked(bytes1(0xda), bytes1(0x94), deployer, bytes1(0x84), uint32(nonce)))
        );
    }

    function computeCreate2Address(bytes32 salt, bytes32 initcodeHash, address deployer)
        internal
        pure
        virtual
        returns (address)
    {
        return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xff), deployer, salt, initcodeHash)));
    }

    function addressFromLast20Bytes(bytes32 bytesValue) private pure returns (address) {
        return address(uint160(uint256(bytesValue)));
    }
}