// SPDX-License-Identifier: GPL-3.0-or-later
// 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 <http://www.gnu.org/licenses/>.

pragma solidity ^0.8.0;

import '@mimic-fi/v2-helpers/contracts/math/FixedPoint.sol';

import './BaseAction.sol';

/**
 * @title TokenThresholdAction
 * @dev Action that offers a token threshold limit. It can be used for minimum swap amounts, or minimum withdrawal
 * amounts, etc. This type of action does not require any specific permission on the Smart Vault.
 */
abstract contract TokenThresholdAction is BaseAction {
    using FixedPoint for uint256;

    address public thresholdToken;
    uint256 public thresholdAmount;

    event ThresholdSet(address indexed token, uint256 amount);

    /**
     * @dev Sets a new threshold configuration. Sender must be authorized.
     * @param token New token threshold to be set
     * @param amount New amount threshold to be set
     */
    function setThreshold(address token, uint256 amount) external auth {
        thresholdToken = token;
        thresholdAmount = amount;
        emit ThresholdSet(token, amount);
    }

    /**
     * @dev Internal function to check the set threshold
     * @param token Token address of the given amount to evaluate the threshold
     * @param amount Amount of tokens to validate the threshold
     */
    function _passesThreshold(address token, uint256 amount) internal view returns (bool) {
        uint256 price = _getPrice(_wrappedIfNative(token), thresholdToken);
        // Result balance is rounded down to make sure we always match at least the threshold
        return amount.mulDown(price) >= thresholdAmount;
    }

    /**
     * @dev Internal function to validate the set threshold
     * @param token Token address of the given amount to evaluate the threshold
     * @param amount Amount of tokens to validate the threshold
     */
    function _validateThreshold(address token, uint256 amount) internal view {
        require(_passesThreshold(token, amount), 'MIN_THRESHOLD_NOT_MET');
    }
}