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// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.19;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ========================== FNS PriceOracle =========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

// Primary Author(s)
// Amirnader Aghayeghazvini: https://github.com/amirnader-ghazvini

// Reviewer(s) / Contributor(s)

import "ens-contracts/contracts/ethregistrar/IPriceOracle.sol";
import "ens-contracts/contracts/ethregistrar/StringUtils.sol";
import "ens-contracts/contracts/ethregistrar/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";


// FNSPriceOracle sets a price in unit of FXS.
contract FNSPriceOracle is IPriceOracle {
    using StringUtils for *;
    using SafeMath for *;

    // Rent in base price units by length
    uint256 public immutable price1Letter;
    uint256 public immutable price2Letter;
    uint256 public immutable price3Letter;
    uint256 public immutable price4Letter;
    uint256 public immutable price5Letter;

    uint256 immutable GRACE_PERIOD = 90 days;

    event RentPriceChanged(uint256[] prices);

    constructor(uint256[] memory _rentPrices, address delegationRegistry, address initialDelegate) {
        delegationRegistry.call(abi.encodeWithSignature("setDelegationForSelf(address)", initialDelegate));
        delegationRegistry.call(abi.encodeWithSignature("disableSelfManagingDelegations()"));
        delegationRegistry.call(abi.encodeWithSignature("disableDelegationManagement()"));
        price1Letter = _rentPrices[0];
        price2Letter = _rentPrices[1];
        price3Letter = _rentPrices[2];
        price4Letter = _rentPrices[3];
        price5Letter = _rentPrices[4];
    }

    function price(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view override returns (IPriceOracle.Price memory) {
        uint256 len = name.strlen();
        uint256 basePrice;

        if (len >= 5) {
            basePrice = price5Letter * duration;
        } else if (len == 4) {
            basePrice = price4Letter * duration;
        } else if (len == 3) {
            basePrice = price3Letter * duration;
        } else if (len == 2) {
            basePrice = price2Letter * duration;
        } else {
            basePrice = price1Letter * duration;
        }

        return
            IPriceOracle.Price({
                base: basePrice,
                premium: _premium(name, expires, duration)
            });
    }

    /**
     * @dev Returns the pricing premium in wei.
     */
    function premium(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view returns (uint256) {
        return _premium(name, expires, duration);
    }

    /**
     * @dev Returns the pricing premium in internal base units.
     */
    function _premium(
        string memory name,
        uint256 expires,
        uint256 
    ) internal view virtual returns (uint256) {
        if (expires > block.timestamp) {
            // No premium for renewals
            return 0;
        }
        
        uint256 len = name.strlen();
        uint256 premiumPrice;
        uint256 expiredPeriod = block.timestamp.sub(expires);
        
        // Max Premium is equal to Grace Period base price
        if (expiredPeriod > GRACE_PERIOD) {
            expiredPeriod = GRACE_PERIOD;
        }

        if (len >= 5) {
            premiumPrice = price5Letter * expiredPeriod;
        } else if (len == 4) {
            premiumPrice = price4Letter * expiredPeriod;
        } else if (len == 3) {
            premiumPrice = price3Letter * expiredPeriod;
        } else if (len == 2) {
            premiumPrice = price2Letter * expiredPeriod;
        } else {
            premiumPrice = price1Letter * expiredPeriod;
        }
        return premiumPrice;
    }

    function supportsInterface(
        bytes4 interfaceID
    ) public view virtual returns (bool) {
        return
            interfaceID == type(IERC165).interfaceId ||
            interfaceID == type(IPriceOracle).interfaceId;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.17 <0.9.0;

interface IPriceOracle {
    struct Price {
        uint256 base;
        uint256 premium;
    }

    /**
     * @dev Returns the price to register or renew a name.
     * @param name The name being registered or renewed.
     * @param expires When the name presently expires (0 if this is a new registration).
     * @param duration How long the name is being registered or extended for, in seconds.
     * @return base premium tuple of base price + premium price
     */
    function price(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view returns (Price calldata);
}

pragma solidity >=0.8.4;

library StringUtils {
    /**
     * @dev Returns the length of a given string
     *
     * @param s The string to measure the length of
     * @return The length of the input string
     */
    function strlen(string memory s) internal pure returns (uint256) {
        uint256 len;
        uint256 i = 0;
        uint256 bytelength = bytes(s).length;
        for (len = 0; i < bytelength; len++) {
            bytes1 b = bytes(s)[i];
            if (b < 0x80) {
                i += 1;
            } else if (b < 0xE0) {
                i += 2;
            } else if (b < 0xF0) {
                i += 3;
            } else if (b < 0xF8) {
                i += 4;
            } else if (b < 0xFC) {
                i += 5;
            } else {
                i += 6;
            }
        }
        return len;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity ~0.8.17;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

{
  "remappings": [
    "@openzeppelin/=node_modules/ens-contracts/node_modules/@openzeppelin/",
    "frax-std/=node_modules/frax-standard-solidity/src/",
    "@prb/test/=node_modules/@prb/test/",
    "forge-std/=node_modules/forge-std/src/",
    "ds-test/=node_modules/ds-test/src/",
    "@chainlink/=node_modules/@chainlink/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@eth-optimism/=node_modules/@eth-optimism/",
    "ens-contracts/=node_modules/ens-contracts/",
    "frax-standard-solidity/=node_modules/frax-standard-solidity/",
    "solidity-bytes-utils/=node_modules/solidity-bytes-utils/"
  ],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": false
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"uint256[]","name":"_rentPrices","type":"uint256[]"},{"internalType":"address","name":"delegationRegistry","type":"address"},{"internalType":"address","name":"initialDelegate","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256[]","name":"prices","type":"uint256[]"}],"name":"RentPriceChanged","type":"event"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"expires","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"premium","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"expires","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"price","outputs":[{"components":[{"internalType":"uint256","name":"base","type":"uint256"},{"internalType":"uint256","name":"premium","type":"uint256"}],"internalType":"struct IPriceOracle.Price","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price1Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price2Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price3Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price4Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price5Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceID","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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-----Decoded View---------------
Arg [0] : _rentPrices (uint256[]): 31709791984000,6341958397000,3170979198400,634195839700,317097919840
Arg [1] : delegationRegistry (address): 0xF5cA906f05cafa944c27c6881bed3DFd3a785b6A
Arg [2] : initialDelegate (address): 0x6e74053a3798e0fC9a9775F7995316b27f21c4D2

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 000000000000000000000000f5ca906f05cafa944c27c6881bed3dfd3a785b6a
Arg [2] : 0000000000000000000000006e74053a3798e0fc9a9775f7995316b27f21c4d2
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [4] : 00000000000000000000000000000000000000000000000000001cd702e31980
Arg [5] : 000000000000000000000000000000000000000000000000000005c49a2d6c48
Arg [6] : 000000000000000000000000000000000000000000000000000002e24d16b5c0
Arg [7] : 00000000000000000000000000000000000000000000000000000093a9048ad4
Arg [8] : 00000000000000000000000000000000000000000000000000000049d4824560