// Contract: DssSpell
// Target function: function increaseIlkDebtCeiling(bytes32 _ilk, uint256 _amount, bool _global) public
 be cast on a weekday
            uint256 hour = _ts / 1 hours % 24;
            if (hour < 14 || hour >= 21)  { return false; }  // Outside office hours
        }
        return true;
    }

    /**
        @dev Calculate the next available cast time in epoch seconds
        @param _eta          The scheduled time of the spell plus the pause delay
        @param _ts           The current timestamp, usually block.timestamp
        @param _officeHours  true if office hours is enabled.
        @return castTime     The next available cast timestamp
    */
    function nextCastTime(uint40 _eta, uint40 _ts, bool _officeHours) public pure returns (uint256 castTime) {
        require(_eta != 0);  // "DssExecLib/invalid eta"
        require(_ts  != 0);  // "DssExecLib/invalid ts"
        castTime = _ts > _eta ? _ts : _eta; // Any day at XX:YY

        if (_officeHours) {
            uint256 day    = (castTime / 1 days + 3) % 7;
            uint256 hour   = castTime / 1 hours % 24;
            uint256 minute = castTime / 1 minutes % 60;
            uint256 second = castTime % 60;

            if (day >= 5) {
                castTime += (6 - day) * 1 days;                 // Go to Sunday XX:YY
                castTime += (24 - hour + 14) * 1 hours;         // Go to 14:YY UTC Monday
                castTime -= minute * 1 minutes + second;        // Go to 14:00 UTC
            } else {
                if (hour >= 21) {
                    if (day == 4) castTime += 2 days;           // If Friday, fast forward to Sunday XX:YY
                    castTime += (24 - hour + 14) * 1 hours;     // Go to 14:YY UTC next day
                    castTime -= minute * 1 minutes + second;    // Go to 14:00 UTC
                } else if (hour < 14) {
                    castTime += (14 - hour) * 1 hours;          // Go to 14:YY UTC same day
                    castTime -= minute * 1 minutes + second;    // Go to 14:00 UTC
                }
            }
        }
    }

    /**************************/
    /*** Accumulating Rates ***/
    /**************************/
    /**
        @dev Update rate accumulation for the Dai Savings Rate (DSR).
    */
    function accumulateDSR() public {
        Drippable(pot()).drip();
    }
    /**
        @dev Update rate accumulation for the stability fees of a given collateral type.
        @param _ilk   Collateral type
    */
    function accumulateCollateralStabilityFees(bytes32 _ilk) public {
        Drippable(jug()).drip(_ilk);
    }

    /*********************/
    /*** Price Updates ***/
    /*********************/
    /**
        @dev Update price of a given collateral type.
        @param _ilk   Collateral type
    */
    function updateCollateralPrice(bytes32 _ilk) public {
        Pricing(spotter()).poke(_ilk);
    }

    /****************************/
    /*** System Configuration ***/
    /****************************/
    /**
        @dev Set a contract in another contract, defining the relationship (ex. set a new Calc contract in Clip)
        @param _base   The address of the contract where the new contract address will be filed
        @param _what   Name of contract to file
        @param _addr   Address of contract to file
    */
    function setContract(address _base, bytes32 _what, address _addr) public {
        Fileable(_base).file(_what, _addr);
    }
    /**
        @dev Set a contract in another contract, defining the relationship (ex. set a new Calc contract in a Clip)
        @param _base   The address of the contract where the new contract address will be filed
        @param _ilk    Collateral type
        @param _what   Name of contract to file
        @param _addr   Address of contract to file
    */
    function setContract(address _base, bytes32 _ilk, bytes32 _what, address _addr) public {
        Fileable(_base).file(_ilk, _what, _addr);
    }
    /**
        @dev Set a value in a contract, via a governance authorized File pattern.
        @param _base   The address of the contract where the new contract address will be filed
        @param _what   Name of tag for the value (e.x. "Line")
        @param _amt    The value to set or update
    */
    function setValue(address _base, bytes32 _what, uint256 _amt) public {
        Fileable(_base).file(_what, _amt);
    }
    /**
        @dev Set an ilk-specific value in a contract, via a governance authorized File pattern.
        @param _base   The address of the contract where the new value will be filed
        @param _ilk    Collateral type
        @param _what   Name of tag for the value (e.x. "Line")
        @param _amt    The value to set or update
    */
    function setValue(address _base, bytes32 _ilk, bytes32 _what, uint256 _amt) public {
        Fileable(_base).file(_ilk, _what, _amt);
    }

    /******************************/
    /*** System Risk Parameters ***/
    /******************************/
    // function setGlobalDebtCeiling(uint256 _amount) public { setGlobalDebtCeiling(vat(), _amount); }
    /**
        @dev Set the global debt ceiling. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 10m DAI amount == 10000000)
    */
    function setGlobalDebtCeiling(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-global-Line-precision"
        setValue(vat(), "Line", _amount * RAD);
    }
    /**
        @dev Increase the global debt ceiling by a specific amount. Amount will be converted to the correct internal precision.
        @param _amount The amount to add in DAI (ex. 10m DAI amount == 10000000)
    */
    function increaseGlobalDebtCeiling(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-Line-increase-precision"
        address _vat = vat();
        setValue(_vat, "Line", add(DssVat(_vat).Line(), _amount * RAD));
    }
    /**
        @dev Decrease the global debt ceiling by a specific amount. Amount will be converted to the correct internal precision.
        @param _amount The amount to reduce in DAI (ex. 10m DAI amount == 10000000)
    */
    function decreaseGlobalDebtCeiling(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-Line-decrease-precision"
        address _vat = vat();
        setValue(_vat, "Line", sub(DssVat(_vat).Line(), _amount * RAD));
    }
    /**
        @dev Set the Dai Savings Rate. See: docs/rates.txt
        @param _rate   The accumulated rate (ex. 4% => 1000000001243680656318820312)
        @param _doDrip `true` to accumulate interest owed
    */
    function setDSR(uint256 _rate, bool _doDrip) public {
        require((_rate >= RAY) && (_rate <= RATES_ONE_HUNDRED_PCT));  // "LibDssExec/dsr-out-of-bounds"
        if (_doDrip) Drippable(pot()).drip();
        setValue(pot(), "dsr", _rate);
    }
    /**
        @dev Set the DAI amount for system surplus auctions. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 10m DAI amount == 10000000)
    */
    function setSurplusAuctionAmount(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-vow-bump-precision"
        setValue(vow(), "bump", _amount * RAD);
    }
    /**
        @dev Set the DAI amount for system surplus buffer, must be exceeded before surplus auctions start. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 10m DAI amount == 10000000)
    */
    function setSurplusBuffer(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-vow-hump-precision"
        setValue(vow(), "hump", _amount * RAD);
    }
    /**
        @dev Set minimum bid increase for surplus auctions. Amount will be converted to the correct internal precision.
        @dev Equation used for conversion is (1 + pct / 10,000) * WAD
        @param _pct_bps The pct, in basis points, to set in integer form (x100). (ex. 5% = 5 * 100 = 500)
    */
    function setMinSurplusAuctionBidIncrease(uint256 _pct_bps) public {
        require(_pct_bps < BPS_ONE_HUNDRED_PCT);  // "LibDssExec/incorrect-flap-beg-precision"
        setValue(flap(), "beg", add(WAD, wdiv(_pct_bps, BPS_ONE_HUNDRED_PCT)));
    }
    /**
        @dev Set bid duration for surplus auctions.
        @param _duration Amount of time for bids. (in seconds)
    */
    function setSurplusAuctionBidDuration(uint256 _duration) public {
        setValue(flap(), "ttl", _duration);
    }
    /**
        @dev Set total auction duration for surplus auctions.
        @param _duration Amount of time for auctions. (in seconds)
    */
    function setSurplusAuctionDuration(uint256 _duration) public {
        setValue(flap(), "tau", _duration);
    }
    /**
        @dev Set the number of seconds that pass before system debt is auctioned for MKR tokens.
        @param _duration Duration in seconds
    */
    function setDebtAuctionDelay(uint256 _duration) public {
        setValue(vow(), "wait", _duration);
    }
    /**
        @dev Set the DAI amount for system debt to be covered by each debt auction. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 10m DAI amount == 10000000)
    */
    function setDebtAuctionDAIAmount(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-vow-sump-precision"
        setValue(vow(), "sump", _amount * RAD);
    }
    /**
        @dev Set the starting MKR amount to be auctioned off to cover system debt in debt auctions. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in MKR (ex. 250 MKR amount == 250)
    */
    function setDebtAuctionMKRAmount(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-vow-dump-precision"
        setValue(vow(), "dump", _amount * WAD);
    }
    /**
        @dev Set minimum bid increase for debt auctions. Amount will be converted to the correct internal precision.
        @dev Equation used for conversion is (1 + pct / 10,000) * WAD
        @param _pct_bps    The pct, in basis points, to set in integer form (x100). (ex. 5% = 5 * 100 = 500)
    */
    function setMinDebtAuctionBidIncrease(uint256 _pct_bps) public {
        require(_pct_bps < BPS_ONE_HUNDRED_PCT);  // "LibDssExec/incorrect-flap-beg-precision"
        setValue(flop(), "beg", add(WAD, wdiv(_pct_bps, BPS_ONE_HUNDRED_PCT)));
    }
    /**
        @dev Set bid duration for debt auctions.
        @param _duration Amount of time for bids.
    */
    function setDebtAuctionBidDuration(uint256 _duration) public {
        setValue(flop(), "ttl", _duration);
    }
    /**
        @dev Set total auction duration for debt auctions.
        @param _duration Amount of time for auctions.
    */
    function setDebtAuctionDuration(uint256 _duration) public {
        setValue(flop(), "tau", _duration);
    }
    /**
        @dev Set the rate of increasing amount of MKR out for auction during debt auctions. Amount will be converted to the correct internal precision.
        @dev MKR amount is increased by this rate every "tick" (if auction duration has passed and no one has bid on the MKR)
        @dev Equation used for conversion is (1 + pct / 10,000) * WAD
        @param _pct_bps    The pct, in basis points, to set in integer form (x100). (ex. 5% = 5 * 100 = 500)
    */
    function setDebtAuctionMKRIncreaseRate(uint256 _pct_bps) public {
        setValue(flop(), "pad", add(WAD, wdiv(_pct_bps, BPS_ONE_HUNDRED_PCT)));
    }
    /**
        @dev Set the maximum total DAI amount that can be out for liquidation in the system at any point. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 250,000 DAI amount == 250000)
    */
    function setMaxTotalDAILiquidationAmount(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-dog-Hole-precision"
        setValue(dog(), "Hole", _amount * RAD);
    }
    /**
        @dev (LIQ 1.2) Set the maximum total DAI amount that can be out for liquidation in the system at any point. Amount will be converted to the correct internal precision.
        @param _amount The amount to set in DAI (ex. 250,000 DAI amount == 250000)
    */
    function setMaxTotalDAILiquidationAmountLEGACY(uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-cat-box-amount"
        setValue(cat(), "box", _amount * RAD);
    }
    /**
        @dev Set the duration of time that has to pass during emergency shutdown before collateral can start being claimed by DAI holders.
        @param _duration Time in seconds to set for ES processing time
    */
    function setEmergencyShutdownProcessingTime(uint256 _duration) public {
        setValue(end(), "wait", _duration);
    }
    /**
        @dev Set the global stability fee (is not typically used, currently is 0).
            Many of the settings that change weekly rely on the rate accumulator
            described at https://docs.makerdao.com/smart-contract-modules/rates-module
            To check this yourself, use the following rate calculation (example 8%):

            $ bc -l <<< 'scale=27; e( l(1.08)/(60 * 60 * 24 * 365) )'

            A table of rates can also be found at:
            https://ipfs.io/ipfs/QmefQMseb3AiTapiAKKexdKHig8wroKuZbmLtPLv4u2YwW
        @param _rate   The accumulated rate (ex. 4% => 1000000001243680656318820312)
    */
    function setGlobalStabilityFee(uint256 _rate) public {
        require((_rate >= RAY) && (_rate <= RATES_ONE_HUNDRED_PCT));  // "LibDssExec/global-stability-fee-out-of-bounds"
        setValue(jug(), "base", _rate);
    }
    /**
        @dev Set the value of DAI in the reference asset (e.g. $1 per DAI). Value will be converted to the correct internal precision.
        @dev Equation used for conversion is value * RAY / 1000
        @param _value The value to set as integer (x1000) (ex. $1.025 == 1025)
    */
    function setDAIReferenceValue(uint256 _value) public {
        require(_value < WAD);  // "LibDssExec/incorrect-par-precision"
        setValue(spotter(), "par", rdiv(_value, 1000));
    }

    /*****************************/
    /*** Collateral Management ***/
    /*****************************/
    /**
        @dev Set a collateral debt ceiling. Amount will be converted to the correct internal precision.
        @param _ilk    The ilk to update (ex. bytes32("ETH-A"))
        @param _amount The amount to set in DAI (ex. 10m DAI amount == 10000000)
    */
    function setIlkDebtCeiling(bytes32 _ilk, uint256 _amount) public {
        require(_amount < WAD);  // "LibDssExec/incorrect-ilk-line-precision"
        setValue(vat(), _ilk, "line", _amount * RAD);
    }