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103/**
104 * @notice Toggles pause/unpause for some or all of the protocol.
105 *
106 * Toggle all regions if none are specified.
107 *
108 * Reverts if:
109 * - A region is specified more than once
110 *
111 * @param _regions - an array of regions to pause/unpause. See: {BosonTypes.PausableRegion}
112 * @param _pause - a boolean indicating whether to pause (true) or unpause (false)
113 */
114function togglePause(BosonTypes.PausableRegion[] calldata _regions, bool _pause) internal {
115    // Cache protocol status for reference
116    ProtocolLib.ProtocolStatus storage status = protocolStatus();
117
118    // Toggle all regions if none are specified.
119    if (_regions.length == 0) {
120        // Store the toggle scenario
121        status.pauseScenario = _pause ? ALL_REGIONS_MASK : 0;
122        return;
123    }
124
125    uint256 region;
126    uint256 incomingScenario;
127
128    // Calculate the incoming scenario as the sum of individual regions
129    // Use "or" to get the correct value even if the same region is specified more than once
130    for (uint256 i = 0; i < _regions.length; i++) {
131        // Get enum value as power of 2
132        region = 1 << uint256(_regions[i]);
133        incomingScenario |= region;
134    }
135
136    // Store the toggle scenario
137    if (_pause) {
138        // for pausing, just "or" the incoming scenario with the existing one
139        // equivalent to summation
140        status.pauseScenario |= incomingScenario;
141    } else {
142        // for unpausing, "and" the inverse of the incoming scenario with the existing one
143        // equivalent to subtraction
144        status.pauseScenario &= ~incomingScenario;
145    }
146}