{
    "Function": "_stake",
    "File": "contracts/DelegatedStaking.sol",
    "Parent Contracts": [
        "node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)",
        "_tokensToShares",
        "_updateValidator",
        "require(bool,string)",
        "_transferToContract",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "_tokensToShares",
        "_updateGlobalExchangeRate",
        "require(bool,string)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _stake(uint128 validatorId, uint128 amount, bool withTransfer) internal {\n        require(amount >= divider, \"Amount must be at least 1 token\");\n        require(validatorId < validatorsN, \"Invalid validator\");\n        Validator storage v = validators[validatorId];\n        require(v.disabledEpoch == 0, \"Validator is disabled\");\n        // if this is the first stake, then set the end epoch\n        if (endEpoch == 0){\n            unchecked { endEpoch = uint128(block.number) + rewardsLocked / allocatedTokensPerEpoch; }\n            rewardsLocked = 0; // no longer used and saves a bit of gas\n        }\n        require(endEpoch > block.number, \"Program ended\");\n        _updateGlobalExchangeRate();\n        _updateValidator(v);\n        // if staker is validator who self delegates\n        if (msg.sender == v._address){\n            require(amount + v.stakings[msg.sender].staked >= validatorMinStakedRequired, \"Amount < min staked required\");\n        }\n        else {\n            // otherwise need to check for max cap\n            uint128 validatorStaked = v.stakings[v._address].staked;\n            uint128 validatorMaxCap = validatorStaked * maxCapMultiplier;\n            uint128 newDelegated = v.delegated - validatorStaked + amount;\n            require(newDelegated <= validatorMaxCap, \"Validator max capacity exceeded\");\n        }\n        // it is set to true when there is a stake\n        // it is set to false when we recover delegation from unstaking\n        if (withTransfer)\n            _transferToContract(msg.sender, amount);\n        Staking storage s = v.stakings[msg.sender];\n\n        // update global shares #\n        uint128 globalSharesToAdd = _tokensToShares(amount, globalExchangeRate);\n        unchecked { totalGlobalShares += globalSharesToAdd; }\n        unchecked { v.globalShares += globalSharesToAdd; }\n\n        // update validator shares #\n        uint128 newDelegatorSharesN = _tokensToShares(amount, v.exchangeRate);\n        unchecked { v.totalShares += newDelegatorSharesN; }\n        unchecked { s.shares += newDelegatorSharesN; }\n        unchecked { v.delegated += amount; }\n        unchecked { s.staked += amount; }\n        emit Staked(validatorId, msg.sender, amount);\n    }"
}