// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

contract UniPool {
    struct Slot0 {
        // the current price
        uint160 sqrtPriceX96;
        // the current tick
        int24 tick;
        // the most-recently updated index of the observations array
        uint16 observationIndex;
        // the current maximum number of observations that are being stored
        uint16 observationCardinality;
        // the next maximum number of observations to store, triggered in observations.write
        uint16 observationCardinalityNext;
        // the current protocol fee as a percentage of the swap fee taken on withdrawal
        // represented as an integer denominator (1/x)%
        uint8 feeProtocol;
        // whether the pool is locked
        bool unlocked;
    }

    Slot0 public slot0;

    function tickSpacing() external pure returns (int24) { return 0; }

    function observe(uint32[] calldata /* secondsAgos */)
        external
        pure
        returns (int56[] memory tickCumulatives, uint160[] memory secondsPerLiquidityCumulativeX128s)
    {
        return (tickCumulatives, secondsPerLiquidityCumulativeX128s);
    }
}