// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity >=0.8.0;

import './IERC20.sol';
import './IRewarder.sol';
import '../libraries/Types.sol';

/// @dev Pools interface
/// @author Alexandas
interface IPools {

	/// @dev emit when ERC20 Token contract updated
	/// @param token ERC20 Token contract
	event TokenUpdated(IERC20 token);

	/// @dev emit when `Rewarder` contract updated
	/// @param rewarder `Rewarder` contract 
	event RewarderUpdated(IRewarder rewarder);

	/// @dev emit when `rewardPerSecond` updated
	/// @param rewardPerSecond reward generated for per second
	event RewardPerSecondUpdated(uint256 rewardPerSecond);

	/// @dev emit when shares precision updated
	/// @param precision shares precision
	event PrecisionUpdated(uint256 precision);

	/// @dev emit when max coefficient updated
	/// @param maxCoef max coefficient
	event MaxCoefUpdated(uint256 maxCoef);

	/// @dev emit when add a pool
	/// @param grade pool grade
	event AddPool(Types.Grade grade);

	/// @dev emit when pool updated
	/// @param grade pool grade
	event PoolUpdated(Types.Grade grade);

	/// @dev return ERC20 token address
	function token() external view returns(IERC20);

	/// @dev return `Rewarder` contract address
	function rewarder() external view returns(IRewarder);

	/// @dev return precision for shares
	function ACC_PRECISION() external view returns(uint256);

	/// @dev return max coefficient
	function MAXCOEF() external view returns(uint256);

	/// @dev return total pools allocation points
	function totalAllocPoint() external view returns(uint256);

	/// @dev return reward generated for per second
	function rewardPerSecond() external view returns(uint256);

	/// @dev update a specific pool
	/// @param grade pool grade
	/// @return pool pool info
	function updatePool(Types.Grade grade) external returns (Types.PoolInfo memory pool);

	/// @dev return a specific pool
	/// @param grade pool grade
	/// @return pool pool info
	function poolInfo(Types.Grade grade) external view returns(Types.PoolInfo memory);

}