/*
 * Copyright ConsenSys AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
pragma solidity >=0.6.0 <0.9.0;

import "./NodeRulesProxy.sol";
import "./NodeRulesList.sol";
import "./NodeIngress.sol";
import "./Admin.sol";


contract NodeRules is NodeRulesProxy, NodeRulesList {

    event NodeAdded(
        bool nodeAdded,
        string enodeId,
        string enodeHost,
        uint16 enodePort
    );

    event NodeRemoved(
        bool nodeRemoved,
        string enodeId,
        string enodeHost,
        uint16 enodePort
    );

    // in read-only mode rules can't be added/removed
    // this will be used to protect data when upgrading contracts
    bool private readOnlyMode = false;
    // version of this contract: semver like 1.2.14 represented like 001002014
    uint private version = 3000000;

    NodeIngress private nodeIngressContract;

    modifier onlyOnEditMode() {
        require(!readOnlyMode, "In read only mode: rules cannot be modified");
        _;
    }

    modifier onlyAdmin() {
        address adminContractAddress = nodeIngressContract.getContractAddress(nodeIngressContract.ADMIN_CONTRACT());

        require(adminContractAddress != address(0), "Ingress contract must have Admin contract registered");
        require(Admin(adminContractAddress).isAuthorized(msg.sender), "Sender not authorized");
        _;
    }

    constructor (NodeIngress _nodeIngressAddress, NodeStorage _storage) public {
        setStorage(_storage);
        nodeIngressContract = _nodeIngressAddress;
    }

    // VERSION
    function getContractVersion() external view returns (uint) {
        return version;
    }

    // READ ONLY MODE
    function isReadOnly() external view returns (bool) {
        return readOnlyMode;
    }

    function enterReadOnly() external onlyAdmin returns (bool) {
        require(readOnlyMode == false, "Already in read only mode");
        readOnlyMode = true;
        return true;
    }

    function exitReadOnly() external onlyAdmin returns (bool) {
        require(readOnlyMode == true, "Not in read only mode");
        readOnlyMode = false;
        return true;
    }

    function connectionAllowed(
        string calldata enodeId,
        string calldata enodeHost,
        uint16 enodePort
    ) external override view returns (bool) {
        return
            enodePermitted (
                enodeId,
                enodeHost,
                enodePort
            );
    }

    function enodePermitted(
        string memory enodeId,
        string memory host,
        uint16 port
    ) public view returns (bool) {
        return exists(enodeId, host, port);
    }

    function addEnode(
        string calldata enodeId,
        string calldata host,
        uint16 port
    ) external onlyAdmin onlyOnEditMode returns (bool) {
        bool added = add(enodeId, host, port);

        if (added) {
            triggerRulesChangeEvent(false);
        }
        emit NodeAdded(
            added,
            enodeId,
            host,
            port
        );

        return added;
    }

    function removeEnode(
        string calldata enodeId,
        string calldata host,
        uint16 port
    ) external onlyAdmin onlyOnEditMode returns (bool) {
        bool removed = remove(enodeId, host, port);

        if (removed) {
            triggerRulesChangeEvent(true);
        }
        emit NodeRemoved(
            removed,
            enodeId,
            host,
            port
        );

        return removed;
    }

    function getSize() external view returns (uint) {
        return size();
    }

    function triggerRulesChangeEvent(bool addsRestrictions) public {
        nodeIngressContract.emitRulesChangeEvent(addsRestrictions);
    }

    function activateValidationEnodeIdOnly(bool _onlyUseEnodeId) external onlyAdmin onlyOnEditMode returns (bool) {
        return setValidateEnodeIdOnly(_onlyUseEnodeId);
    }
}