contract TribalChiefSyncV2 {
    ITribalChief public immutable tribalChief;
    IAutoRewardsDistributor public immutable autoRewardsDistributor;
    ITimelock public immutable timelock;

    /// @notice a mapping from reward rates to timestamps after which they become active
    mapping(uint256 => uint256) public rewardsSchedule;

    /// @notice rewards schedule in reverse order
    uint256[] public rewardsArray;

    // TribalChief struct
    struct RewardData {
        uint128 lockLength;
        uint128 rewardMultiplier;
    }

    constructor(
        ITribalChief _tribalChief,
        IAutoRewardsDistributor _autoRewardsDistributor,
        ITimelock _timelock,
        uint256[] memory rewards,
        uint256[] memory timestamps
    ) {
        tribalChief = _tribalChief;
        autoRewardsDistributor = _autoRewardsDistributor;
        timelock = _timelock;

        require(rewards.length == timestamps.length, "length");

        uint256 lastReward = type(uint256).max;
        uint256 lastTimestamp = block.timestamp;
        uint256 len = rewards.length;
        rewardsArray = new uint256[](len);

        for (uint256 i = 0; i < len; i++) {
            uint256 nextReward = rewards[i];
            uint256 nextTimestamp = timestamps[i];
            
            require(nextReward < lastReward, "rewards");
            require(nextTimestamp > lastTimestamp, "timestamp");
            
            rewardsSchedule[nextReward] = nextTimestamp;
            rewardsArray[len - i - 1] = nextReward;

            lastReward = nextReward;
            lastTimestamp = nextTimestamp;
        }
    }

    /// @notice Before an action, mass update all pools, after sync the autoRewardsDistributor
    modifier update {
        uint256 numPools = tribalChief.numPools();
        uint256[] memory pids = new uint256[](numPools);
        for (uint256 i = 0; i < numPools; i++) {
            pids[i] = i;
        }
        tribalChief.massUpdatePools(pids);
        _;
        autoRewardsDistributor.setAutoRewardsDistribution();
    }

    /// @notice Sync a rewards rate change automatically using pre-approved map
    function autoDecreaseRewards() external update {
        require(isRewardDecreaseAvailable(), "time not passed");
        uint256 tribePerBlock = nextRewardsRate();
        tribalChief.updateBlockReward(tribePerBlock);
        rewardsArray.pop();
    }

    function isRewardDecreaseAvailable() public view returns(bool) {
        return rewardsArray.length > 0 && nextRewardTimestamp() < block.timestamp;
    }

    function nextRewardTimestamp() public view returns(uint256) {
        return rewardsSchedule[nextRewardsRate()];
    }

    function nextRewardsRate() public view returns(uint256) {
        return rewardsArray[rewardsArray.length - 1];
    }

    /// @notice Sync a rewards rate change
    function decreaseRewards(uint256 tribePerBlock, bytes32 salt) external update {
        bytes memory data = abi.encodeWithSelector(
            tribalChief.updateBlockReward.selector, 
            tribePerBlock
        );
        timelock.execute(
            address(tribalChief), 
            0, 
            data, 
            bytes32(0), 
            salt
        );
    }

    /// @notice Sync a pool addition
    function addPool(
        uint120 allocPoint, 
        address stakedToken, 
        address rewarder, 
        RewardData[] memory rewardData, 
        bytes32 salt
    ) external update {
        bytes memory data = abi.encodeWithSelector(
            tribalChief.add.selector, 
            allocPoint,
            stakedToken,
            rewarder,
            rewardData
        );
        timelock.execute(
            address(tribalChief), 
            0, 
            data, 
            bytes32(0), 
            salt
        );
    }

    /// @notice Sync a pool set action
    function setPool(
        uint256 pid,
        uint120 allocPoint,
        IRewarder rewarder,
        bool overwrite,
        bytes32 salt
    ) external update {
        bytes memory data = abi.encodeWithSelector(
            tribalChief.set.selector,
            pid,
            allocPoint,
            rewarder,
            overwrite
        );
        timelock.execute(
            address(tribalChief), 
            0, 
            data, 
            bytes32(0), 
            salt
        );
    }

    /// @notice Sync a pool reset rewards action
    function resetPool(
        uint256 pid,
        bytes32 salt
    ) external update {
        bytes memory data = abi.encodeWithSelector(
            tribalChief.resetRewards.selector,
            pid
        );
        timelock.execute(
            address(tribalChief), 
            0, 
            data, 
            bytes32(0), 
            salt
        );
    }
}
/**
 @title TribalChief Synchronize contract
 This contract is able to keep the tribalChief and autoRewardsDistributor in sync when either:
 1. adding pools or
 2. updating block rewards
 
 It needs the EXECUTOR role on the optimistic timelock, so it can atomically trigger the 3 actions.
 
 It also includes a mapping for updating block rewards according to the schedule in https://tribe.fei.money/t/tribe-liquidity-mining-emission-schedule/3549
 It needs the TRIBAL_CHIEF_ADMIN_ROLE role to auto trigger reward decreases.
 */
function autoDecreaseRewards() external update {
        require(isRewardDecreaseAvailable(), "time not passed");
        uint256 tribePerBlock = nextRewardsRate();
        tribalChief.updateBlockReward(tribePerBlock);
        rewardsArray.pop();
    }
/// @notice Sync a rewards rate change automatically using pre-approved map