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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title POHNodeRegistry — Proof of Planet Node Registration
 * @notice Manages the registration and reputation of mining nodes in the
 *         Proof of Planet network. Supports two tiers:
 *
 *   Tier 1 — Data Nodes:       Any phone. Collect sensor data + run science compute.
 *   Tier 2 — Validation Nodes: More powerful devices. Cross-check and verify data.
 *
 * Features:
 *   - Device registration with unique device IDs
 *   - School program: batch-register devices under a school name (higher caps)
 *   - Validator staking: optional POH stake for premium validator rewards
 *   - Slashing: bad validators lose staked tokens
 *   - Reputation: on-chain reputation score tracked per address
 */
contract POHNodeRegistry is Ownable {
    using SafeERC20 for IERC20;

    // ── Constants ─────────────────────────────────────────────────────────
    uint8 public constant TIER_DATA = 1;
    uint8 public constant TIER_VALIDATOR = 2;
    uint256 public constant MIN_STAKE = 1000 ether; // 1,000 POH minimum stake

    // ── State ─────────────────────────────────────────────────────────────
    IERC20 public immutable token;

    struct Node {
        address owner;
        uint8 tier;
        bool active;
        uint256 registeredAt;
    }

    struct School {
        string name;
        address admin;
        uint256 registeredAt;
        uint256 nodeCount;
    }

    /// @notice Node data by device ID
    mapping(bytes32 => Node) public nodes;

    /// @notice All device IDs owned by an address
    mapping(address => bytes32[]) public ownerDevices;

    /// @notice School data by school ID (keccak256 of name)
    mapping(bytes32 => School) public schools;

    /// @notice Device ID → school ID (zero if not a school device)
    mapping(bytes32 => bytes32) public deviceSchool;

    /// @notice Validator stake amount per address
    mapping(address => uint256) public validatorStake;

    /// @notice Reputation score per address (starts at 0, increases with good behavior)
    mapping(address => uint256) public reputation;

    // ── Counters ──────────────────────────────────────────────────────────
    uint256 public totalNodes;
    uint256 public totalValidators;
    uint256 public totalSchools;
    uint256 public totalStaked;

    // ── Events ────────────────────────────────────────────────────────────
    event NodeRegistered(
        bytes32 indexed deviceId,
        address indexed owner,
        uint8 tier
    );
    event NodeDeactivated(bytes32 indexed deviceId, address indexed owner);
    event SchoolRegistered(
        bytes32 indexed schoolId,
        string name,
        address indexed admin,
        uint256 nodeCount
    );
    event StakeDeposited(address indexed validator, uint256 amount);
    event StakeWithdrawn(address indexed validator, uint256 amount);
    event ValidatorSlashed(
        address indexed validator,
        uint256 amount,
        string reason
    );
    event ReputationUpdated(address indexed node, uint256 newScore);

    // ── Constructor ───────────────────────────────────────────────────────
    constructor(address _token) Ownable(msg.sender) {
        require(_token != address(0), "Registry: token is zero");
        token = IERC20(_token);
    }

    // ── Register a node ───────────────────────────────────────────────────
    /**
     * @notice Register a device as a Data Node (tier 1) or Validation Node (tier 2).
     * @param _deviceId Unique device identifier (hash of device attestation)
     * @param _tier 1 = Data Node, 2 = Validation Node
     */
    function registerNode(bytes32 _deviceId, uint8 _tier) external {
        require(_deviceId != bytes32(0), "Registry: empty device ID");
        require(_tier == TIER_DATA || _tier == TIER_VALIDATOR, "Registry: invalid tier");
        require(nodes[_deviceId].owner == address(0), "Registry: device already registered");

        nodes[_deviceId] = Node({
            owner: msg.sender,
            tier: _tier,
            active: true,
            registeredAt: block.timestamp
        });

        ownerDevices[msg.sender].push(_deviceId);
        totalNodes++;

        if (_tier == TIER_VALIDATOR) {
            totalValidators++;
        }

        emit NodeRegistered(_deviceId, msg.sender, _tier);
    }

    // ── Deactivate a node ─────────────────────────────────────────────────
    /**
     * @notice Deactivate a node. Only the node owner can deactivate.
     * @param _deviceId The device to deactivate
     */
    function deactivateNode(bytes32 _deviceId) external {
        Node storage node = nodes[_deviceId];
        require(node.owner == msg.sender, "Registry: not your device");
        require(node.active, "Registry: already inactive");

        node.active = false;
        totalNodes--;

        if (node.tier == TIER_VALIDATOR) {
            totalValidators--;
        }

        emit NodeDeactivated(_deviceId, msg.sender);
    }

    // ── Register a school ─────────────────────────────────────────────────
    /**
     * @notice Register a school with multiple devices. Schools get higher
     *         reward caps to incentivize educational participation.
     * @param _name Human-readable school name (stored on-chain)
     * @param _deviceIds Array of device IDs for the school's nodes
     */
    function registerSchool(
        string calldata _name,
        bytes32[] calldata _deviceIds
    ) external {
        require(bytes(_name).length > 0, "Registry: empty name");
        require(_deviceIds.length > 0, "Registry: no devices");

        bytes32 schoolId = keccak256(abi.encodePacked(_name, msg.sender));
        require(schools[schoolId].admin == address(0), "Registry: school exists");

        schools[schoolId] = School({
            name: _name,
            admin: msg.sender,
            registeredAt: block.timestamp,
            nodeCount: _deviceIds.length
        });

        for (uint256 i = 0; i < _deviceIds.length; i++) {
            bytes32 deviceId = _deviceIds[i];
            require(deviceId != bytes32(0), "Registry: empty device ID");
            require(nodes[deviceId].owner == address(0), "Registry: device already registered");

            nodes[deviceId] = Node({
                owner: msg.sender,
                tier: TIER_DATA,
                active: true,
                registeredAt: block.timestamp
            });

            ownerDevices[msg.sender].push(deviceId);
            deviceSchool[deviceId] = schoolId;
            totalNodes++;
        }

        totalSchools++;
        emit SchoolRegistered(schoolId, _name, msg.sender, _deviceIds.length);
    }

    // ── Validator staking ─────────────────────────────────────────────────
    /**
     * @notice Stake POH tokens to become a premium validator. Higher stake =
     *         higher trust and rewards. Must approve tokens first.
     * @param _amount Amount of POH to stake (minimum MIN_STAKE)
     */
    function stakeForValidation(uint256 _amount) external {
        require(_amount >= MIN_STAKE, "Registry: below minimum stake");

        token.safeTransferFrom(msg.sender, address(this), _amount);
        validatorStake[msg.sender] += _amount;
        totalStaked += _amount;

        emit StakeDeposited(msg.sender, _amount);
    }

    /**
     * @notice Withdraw staked tokens. Validators can unstake at any time,
     *         but lose premium rewards while unstaked.
     * @param _amount Amount of POH to withdraw
     */
    function unstake(uint256 _amount) external {
        require(_amount > 0, "Registry: zero amount");
        require(validatorStake[msg.sender] >= _amount, "Registry: insufficient stake");

        validatorStake[msg.sender] -= _amount;
        totalStaked -= _amount;

        token.safeTransfer(msg.sender, _amount);
        emit StakeWithdrawn(msg.sender, _amount);
    }

    // ── Owner: Slash a bad validator ──────────────────────────────────────
    /**
     * @notice Slash a validator's stake for approving fake data or malicious
     *         behavior. Slashed tokens are burned (sent to address(0) is not
     *         possible with SafeERC20, so they stay in the contract as a
     *         penalty pool for future redistribution).
     * @param _validator The validator to slash
     * @param _amount Amount to slash (cannot exceed their stake)
     * @param _reason Human-readable reason (stored in event for transparency)
     */
    function slashValidator(
        address _validator,
        uint256 _amount,
        string calldata _reason
    ) external onlyOwner {
        require(_amount > 0, "Registry: zero amount");
        require(validatorStake[_validator] >= _amount, "Registry: slash exceeds stake");
        require(bytes(_reason).length > 0, "Registry: reason required");

        validatorStake[_validator] -= _amount;
        totalStaked -= _amount;
        // Slashed tokens remain in contract as penalty pool

        // Reduce reputation
        if (reputation[_validator] >= 10) {
            reputation[_validator] -= 10;
        } else {
            reputation[_validator] = 0;
        }

        emit ValidatorSlashed(_validator, _amount, _reason);
        emit ReputationUpdated(_validator, reputation[_validator]);
    }

    // ── Owner: Update reputation ──────────────────────────────────────────
    /**
     * @notice Update a node operator's reputation score. Called by backend
     *         after validating data quality over time.
     * @param _node The node operator's address
     * @param _score New reputation score
     */
    function setReputation(address _node, uint256 _score) external onlyOwner {
        reputation[_node] = _score;
        emit ReputationUpdated(_node, _score);
    }

    /**
     * @notice Batch update reputation scores for multiple addresses.
     * @param _nodes Array of node operator addresses
     * @param _scores Array of new reputation scores
     */
    function setReputationBatch(
        address[] calldata _nodes,
        uint256[] calldata _scores
    ) external onlyOwner {
        require(_nodes.length == _scores.length, "Registry: length mismatch");

        for (uint256 i = 0; i < _nodes.length; i++) {
            reputation[_nodes[i]] = _scores[i];
            emit ReputationUpdated(_nodes[i], _scores[i]);
        }
    }

    // ── View: Get devices for an owner ────────────────────────────────────
    function getOwnerDevices(address _owner) external view returns (bytes32[] memory) {
        return ownerDevices[_owner];
    }

    /// @notice Get the number of devices registered by an address
    function getOwnerDeviceCount(address _owner) external view returns (uint256) {
        return ownerDevices[_owner].length;
    }

    /// @notice Check if a device is registered and active
    function isActiveNode(bytes32 _deviceId) external view returns (bool) {
        return nodes[_deviceId].active;
    }

    /// @notice Check if an address is a staked validator
    function isStakedValidator(address _addr) external view returns (bool) {
        return validatorStake[_addr] >= MIN_STAKE;
    }
}

// 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 v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// 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 v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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ceId","type":"bytes32"},{"internalType":"uint8","name":"_tier","type":"uint8"}],"name":"registerNode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"bytes32[]","name":"_deviceIds","type":"bytes32[]"}],"name":"registerSchool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"reputation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"schools","outputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"address","name":"admin","type":"address"},{"internalType":"uint256","name":"registeredAt","type":"uint256"},{"internalType":"uint256","name":"nodeCount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_node","type":"address"},{"internalType":"uint256","name":"_score","type":"uint256"}],"name":"setReputation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_nodes","type":"address[]"},{"internalType":"uint256[]","name":"_scores","type":"uint256[]"}],"name":"setReputationBatch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_validator","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"string","name":"_reason","type":"string"}],"name":"slashValidator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"stakeForValidation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract 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000000000000000000000000280ddb8b67ad8cf791d370fe59227d19e989fb07

-----Decoded View---------------
Arg [0] : _token (address): 0x280Ddb8b67Ad8cf791D370FE59227d19e989Fb07

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000280ddb8b67ad8cf791d370fe59227d19e989fb07