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76/**
77    @dev Unstakes a certain amount of tokens, this SHOULD return the given amount of tokens to the account, if unstaking is currently not possible the function MUST revert
78    @param amount Amount of tokens to remove from the stake
79    @param isTokenA true if unstaking tokenA
80*/
81function unstake(uint256 amount, bool isTokenA) external {
82    stakingContractEth.unstakeFrom(msg.sender, amount);
83
84    uint256[] storage tokens;
85    if(isTokenA)
86        tokens = tokenOwnershipA[msg.sender];
87    else
88        tokens = tokenOwnershipB[msg.sender];
89
90    for(uint i = 0; i < amount; i++) {
91        uint256 id = tokens[tokens.length - 1];
92        tokens.pop();
93        if(isTokenA)
94            tokenA.transferFrom(address(this), msg.sender, id);
95        else
96            tokenB.transferFrom(address(this), msg.sender, id);
97    }
98
99    emit Unstaked(msg.sender, amount, totalStakedFor(msg.sender));
100    emit StakeChanged(stakingContractEth.totalStaked(), block.timestamp);
101}