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/**
 *     NOTICE
 *
 *     The T-REX software is licensed under a proprietary license or the GPL v.3.
 *     If you choose to receive it under the GPL v.3 license, the following applies:
 *     T-REX is a suite of smart contracts implementing the ERC-3643 standard and
 *     developed by Tokeny to manage and transfer financial assets on EVM blockchains
 *
 *     Copyright (C) 2023, Tokeny sàrl.
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

pragma solidity 0.8.17;

import "../../roles/AgentRole.sol";
import "./ICompliance.sol";
import "../../token/IToken.sol";

abstract contract BasicCompliance is AgentRole, ICompliance {

    /// Mapping between agents and their statuses
    mapping(address => bool) private _tokenAgentsList;

    /// Mapping of tokens linked to the compliance contract
    IToken public tokenBound;

    /**
     * @dev Throws if called by any address that is not a token bound to the compliance.
     */
    modifier onlyToken() {
        require(_isToken(), "error : this address is not a token bound to the compliance contract");
        _;
    }

    /**
     * @dev Throws if called by any address that is not owner of compliance or agent of the token.
     */
    modifier onlyAdmin() {
        require(owner() == msg.sender || (AgentRole(address(tokenBound))).isAgent(msg.sender) ,
            "can be called only by Admin address");
        _;
    }

    /**
     *  @dev See {ICompliance-addTokenAgent}.
     *  this function is deprecated, but still implemented to avoid breaking interfaces
     */
    function addTokenAgent(address _agentAddress) external override onlyOwner {
        require(!_tokenAgentsList[_agentAddress], "This Agent is already registered");
        _tokenAgentsList[_agentAddress] = true;
        emit TokenAgentAdded(_agentAddress);
    }

    /**
    *  @dev See {ICompliance-isTokenAgent}.
    */
    function removeTokenAgent(address _agentAddress) external override onlyOwner {
        require(_tokenAgentsList[_agentAddress], "This Agent is not registered yet");
        _tokenAgentsList[_agentAddress] = false;
        emit TokenAgentRemoved(_agentAddress);
    }

    /**
     *  @dev See {ICompliance-bindToken}.
     */
    function bindToken(address _token) external override {
        require(owner() == msg.sender || (address(tokenBound) == address(0) && msg.sender == _token),
            "only owner or token can call");
        tokenBound = IToken(_token);
        emit TokenBound(_token);
    }

    /**
    *  @dev See {ICompliance-unbindToken}.
    */
    function unbindToken(address _token) external override {
        require(owner() == msg.sender || msg.sender == _token , "only owner or token can call");
        require(_token == address(tokenBound), "This token is not bound");
        delete tokenBound;
        emit TokenUnbound(_token);
    }

    /**
    *  @dev See {ICompliance-isTokenAgent}.
    */
    function isTokenAgent(address _agentAddress) public override view returns (bool) {
        if (!_tokenAgentsList[_agentAddress] && !(AgentRole(address(tokenBound))).isAgent(_agentAddress)) {
            return false;
        }
        return true;
    }

    /**
    *  @dev See {ICompliance-isTokenBound}.
    */
    function isTokenBound(address _token) public override view returns (bool) {
        if (_token != address(tokenBound)){
            return false;
        }
        return true;
    }

    /**
    *  @dev Returns true if the sender corresponds to a token that is bound with the Compliance contract
    */
    function _isToken() internal view returns (bool) {
        return isTokenBound(msg.sender);
    }

    /**
    *  @dev Returns the ONCHAINID (Identity) of the _userAddress
    *  @param _userAddress Address of the wallet
    *  internal function, can be called only from the functions of the Compliance smart contract
    */
    function _getIdentity(address _userAddress) internal view returns (address) {
        return address(tokenBound.identityRegistry().identity(_userAddress));
    }

    /**
    *  @dev Returns the country of residence of the _userAddress
    *  @param _userAddress Address of the wallet
    *  internal function, can be called only from the functions of the Compliance smart contract
    */
    function _getCountry(address _userAddress) internal view returns (uint16) {
        return tokenBound.identityRegistry().investorCountry(_userAddress);
    }

}