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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.27;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ECDSA} from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import {IUpdateVerifier} from "./interfaces/IUpdateVerifier.sol";
import {IStateOracle} from "./interfaces/IStateOracle.sol";

/// Validators registry is an update verifier which use its internal storage of validators.
/// To be owned by UpdateManager, to allow setting validators by signed updates.
/// @custom:security-contact [email protected]
contract ValidatorsRegistry is Ownable, IUpdateVerifier {

    mapping(address validatorId => uint256 weight) public validatorWeight;
    mapping(address validatorAddr => uint256 validatorId) public validatorId;
    uint256 public totalWeight;
    address[] public validatorAddress;
    IStateOracle public immutable stateOracle; // for threshold decreasing on stateOracle inactivity

    constructor(address _stateOracle, address _ownedBy) Ownable(_ownedBy) {
        stateOracle = IStateOracle(_stateOracle); // zero allowed (if no threshold decreasing should be applied)
        validatorAddress.push(); // avoid lastValidatorId underflow
    }

    function lastValidatorId() public view returns(uint256) {
        return validatorAddress.length - 1; // index 0 is not used
    }

    function setValidators(bytes calldata newValidatorsBytes) onlyOwner external {
        IUpdateVerifier.Validator[] memory newValidators = abi.decode(newValidatorsBytes, (IUpdateVerifier.Validator[]));
        uint256 total = totalWeight;
        for (uint16 i; i < newValidators.length; i++) {
            uint256 id = newValidators[i].id;
            address newAddr = newValidators[i].addr;
            uint256 newWeight = newValidators[i].weight;
            require(id != 0, "validator id cannot be 0");

            if (validatorAddress.length <= id) {
                // adding new validator id
                require(validatorId[newAddr] == 0, "setting duplicate address");
                extendValidatorsArray(id + 1);
                validatorAddress[id] = newAddr;
                validatorId[newAddr] = id;

            } else {
                // existing validator id
                address oldAddr = validatorAddress[id];
                total -= validatorWeight[oldAddr];

                if (oldAddr != newAddr) {
                    // setting new address (public key)
                    require(validatorId[newAddr] == 0, "setting duplicate address");
                    delete validatorWeight[oldAddr];
                    delete validatorId[oldAddr];
                    validatorAddress[id] = newAddr;
                    validatorId[newAddr] = id;
                }
            }

            validatorWeight[newAddr] = newWeight;
            total += newWeight;
        }
        totalWeight = total;
    }

    function extendValidatorsArray(uint256 newLength) private {
        // set validatorAddress.length
        assembly {
            sstore(validatorAddress.slot, newLength)
        }
    }

    /// Verify the state oracle update signatures
    function verifyUpdate(uint256 blockNum, bytes32 stateRoot, uint256 chainId, bytes calldata newValidators, address proofVerifier, address updateVerifier, address exitAdmin, bytes[] calldata signatures) external view returns (uint256[] memory) {
        bytes32 messageHash = keccak256(abi.encodePacked(uint8(0x19), uint8(0x00), msg.sender, blockNum, stateRoot, chainId, newValidators, proofVerifier, updateVerifier, exitAdmin));

        uint256 weight = 0;
        address lastSigner = address(0);
        uint256[] memory signers = new uint256[](signatures.length);

        for (uint16 i; i < signatures.length; i++) {
            address signer = ECDSA.recover(messageHash, signatures[i]);
            uint256 signerWeight = validatorWeight[signer];
            require(signerWeight > 0, "Invalid signer");
            require(signer > lastSigner, "Invalid signatures order"); // ensures signers uniqueness
            lastSigner = signer;
            weight += signerWeight;
            signers[i] = validatorId[signer];
        }

        if (weight > (totalWeight * 2 / 3)) {
            return signers; // fast path
        }
        // allow updating with lower quorum if the oracle is dying
        if (weight > getQuorum()) {
            return signers;
        }
        revert("Insufficient signatures weight");
    }

    function getQuorum() public view returns (uint256) {
        uint256 total = totalWeight;
        uint256 initialQuorum = total * 2 / 3; // 66%
        uint256 recoveryQuorum = total * 55 / 100; // 55%
        uint256 rebornQuorum = total / 3; // 33%

        if (address(stateOracle) == address(0)) {
            return initialQuorum; // threshold decreasing not enabled
        }
        uint256 lastUpdateTime = stateOracle.lastUpdateTime();
        if (lastUpdateTime == 0) {
            return initialQuorum; // state oracle not initialized yet
        }
        uint256 offlineTime = block.timestamp - lastUpdateTime;

        if (offlineTime <= 5 days) {
            return initialQuorum;
        }
        if (offlineTime <= 7 days) {
            return slope(initialQuorum, recoveryQuorum, offlineTime - 5 days, 2 days);
        }
        if (offlineTime <= 182 days) {
            return recoveryQuorum;
        }
        if (offlineTime <= 189 days) {
            return slope(recoveryQuorum, rebornQuorum, offlineTime - 182 days, 7 days);
        }
        return rebornQuorum;
    }

    function slope(uint256 maxOut, uint256 minOut, uint256 currentDuration, uint256 totalDuration) private pure returns (uint256) {
        uint256 slopeHeight = maxOut - minOut;
        return maxOut - (slopeHeight * currentDuration / totalDuration);
    }

}

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

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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 (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.20;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
     * return address(0) without also returning an error description. Errors are documented using an enum (error type)
     * and a bytes32 providing additional information about the error.
     *
     * If no error is returned, then the address can be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(
        bytes32 hash,
        bytes memory signature
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly ("memory-safe") {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[ERC-2098 short signatures]
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.27;

/// State oracle provides the hash of a different chain state.
interface IStateOracle {
    function lastState() external view returns (bytes32);
    function lastBlockNum() external view returns (uint256);
    function lastUpdateTime() external view returns (uint256);
    function chainId() external view returns (uint256);

    function update(uint256 blockNum, bytes32 stateRoot) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.27;

/// Update verifier provides a way to verify validators signatures on an update.
/// It provides access to the validators registry for the purpose of inter-chain synchronization.
interface IUpdateVerifier {
    struct Validator {
        uint256 id;
        address addr;
        uint256 weight;
    }

    /// Verify the state oracle update signatures
    function verifyUpdate(uint256 blockNum, bytes32 stateRoot, uint256 chainId, bytes calldata newValidators, address proofVerifier, address updateVerifier, address exitAdmin, bytes[] calldata signatures) external view returns (uint256[] memory);

    /// Write into the validators registry - reverts if the registry is readonly.
    function setValidators(bytes calldata newValidators) external;

    /// Get the highest validator id for purpose of iterating
    function lastValidatorId() external view returns(uint256);

    /// Get validator pubkey address by validator id
    function validatorAddress(uint256 index) external view returns(address);

    /// Get validator weight by validator address
    function validatorWeight(address addr) external view returns(uint256);

    /// Get validator id by validator pubkey address
    function validatorId(address addr) external view returns(uint256);

    /// Get weight of all registered validators
    function totalWeight() external view returns(uint256);

    /// Get weight necessary to update the state oracle
    function getQuorum() external view returns (uint256);
}

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

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[{"inputs":[{"internalType":"address","name":"_stateOracle","type":"address"},{"internalType":"address","name":"_ownedBy","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ECDSAInvalidSignature","type":"error"},{"inputs":[{"internalType":"uint256","name":"length","type":"uint256"}],"name":"ECDSAInvalidSignatureLength","type":"error"},{"inputs":[{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"ECDSAInvalidSignatureS","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"getQuorum","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastValidatorId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"newValidatorsBytes","type":"bytes"}],"name":"setValidators","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stateOracle","outputs":[{"internalType":"contract IStateOracle","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalWeight","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"validatorAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"validatorAddr","type":"address"}],"name":"validatorId","outputs":[{"internalType":"uint256","name":"validatorId","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"validatorId","type":"address"}],"name":"validatorWeight","outputs":[{"internalType":"uint256","name":"weight","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"blockNum","type":"uint256"},{"internalType":"bytes32","name":"stateRoot","type":"bytes32"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"bytes","name":"newValidators","type":"bytes"},{"internalType":"address","name":"proofVerifier","type":"address"},{"internalType":"address","name":"updateVerifier","type":"address"},{"internalType":"address","name":"exitAdmin","type":"address"},{"internalType":"bytes[]","name":"signatures","type":"bytes[]"}],"name":"verifyUpdate","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080957d62c7cc252e5dd2f8691a9afb3087f88fa1

-----Decoded View---------------
Arg [0] : _stateOracle (address): 0x0000000000000000000000000000000000000000
Arg [1] : _ownedBy (address): 0x80957D62C7Cc252E5dd2f8691a9afB3087f88Fa1

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 00000000000000000000000080957d62c7cc252e5dd2f8691a9afb3087f88fa1