pragma solidity 0.5.16;

// https://docs.peri.finance/contracts/source/interfaces/isystemstatus
interface ISystemStatus {
    struct Status {
        bool canSuspend;
        bool canResume;
    }

    struct Suspension {
        bool suspended;
        // reason is an integer code,
        // 0 => no reason, 1 => upgrading, 2+ => defined by system usage
        uint248 reason;
    }

    // Views
    function accessControl(bytes32 section, address account) external view returns (bool canSuspend, bool canResume);

    function requireSystemActive() external view;

    function requireIssuanceActive() external view;

    function requireExchangeActive() external view;

    function requireExchangeBetweenPynthsAllowed(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function requirePynthActive(bytes32 currencyKey) external view;

    function requirePynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function systemSuspension() external view returns (bool suspended, uint248 reason);

    function issuanceSuspension() external view returns (bool suspended, uint248 reason);

    function exchangeSuspension() external view returns (bool suspended, uint248 reason);

    function pynthExchangeSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function pynthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function getPynthExchangeSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory exchangeSuspensions, uint256[] memory reasons);

    function getPynthSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory suspensions, uint256[] memory reasons);

    // Restricted functions
    function suspendPynth(bytes32 currencyKey, uint256 reason) external;

    function updateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) external;
}