// File: contracts/KingToken.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";

// KingToken with Governance.
contract KingToken is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name = "KingToken";
    string private _symbol = "$KING";
    uint8 private _decimals = 18;

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);

        _moveDelegates(_delegates[sender], _delegates[recipient], amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }

    /// @notice Creates `_amount` token to `_to`. Must only be called by the owner (Archbishop).
    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    // Copied and modified from YAM code:
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
    // Which is copied and modified from COMPOUND:
    // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol

    /// @notice A record of each accounts delegate
    mapping (address => address) internal _delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping (address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of states for signing / validating signatures
    mapping (address => uint) public nonces;

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator)
        external
        view
        returns (address)
    {
        return _delegates[delegator];
    }

   /**
    * @notice Delegate votes from `msg.sender` to `delegatee`
    * @param delegatee The address to delegate votes to
    */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name())),
                getChainId(),
                address(this)
            )
        );

        bytes32 structHash = keccak256(
            abi.encode(
                DELEGATION_TYPEHASH,
                delegatee,
                nonce,
                expiry
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                structHash
            )
        );

        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "KING::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "KING::delegateBySig: invalid nonce");
        require(now <= expiry, "KING::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account)
        external
        view
        returns (uint256)
    {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber)
        external
        view
        returns (uint256)
    {
        require(blockNumber < block.number, "KING::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee)
        internal
    {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying KINGs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    )
        internal
    {
        uint32 blockNumber = safe32(block.number, "KING::_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: contracts/StakeHolderFund.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./KingToken.sol";

contract StakeHolderFund is Ownable {
    using SafeMath for uint;

    // the king token
    KingToken public king;
    
    //Early Liquidity Provider
    struct ELPInfo {
        address walletAddress;
        uint index;
        uint256 allocPoint; // How many allocation points assigned to this pool. KINGs to distribute per block.
        bool statusActive;
    }

    struct UserInfo{
        address walletAddress;
        // Assume it as ID rather than Index, will be index-1 in the Array *important*
        uint index;
        // Inactive would mean the wallet will not recieve token
        bool statusActive;
    }

    // Advisor Address.
    // Assume the uint as the Index, will be identical to index in the Array
    mapping(address => uint) public advAddress;
    UserInfo[] public advArray;
    uint advActiveSize;

    // EarlyLP Address.
    mapping(address => uint) public elpAddress;
    ELPInfo[] public elpArray;
    uint elpActiveSize;

    // eTeam Address.
    mapping(address => uint) public eteamAddress;
    UserInfo[] public eteamArray;
    uint eteamActiveSize;


    // Company Address.
    address public companyaddr;

    // StakeholderFund Timelock address
    address public stakeHolderFundTimelock;
    
    //Default Constructor
    constructor(KingToken _king, 
     ELPInfo[]  memory _elpaddr,
     UserInfo[] memory _advaddr,
     UserInfo[] memory _eteamaddr,
     address _companyaddr,
     address _stakeHolderFundTimelock)
    public{
        king = _king;
        //Initialize LPinfo address
        updateELPInfo(_elpaddr,elpArray);
        updateMappingELPInfo(elpAddress,_elpaddr);

        //Initialize userinfo address
        updateUserInfo(_advaddr,advArray);
        //Set the active size for advisor
        advActiveSize = advArray.length;
        updateMappingUserInfo(advAddress,_advaddr);
        updateUserInfo(_eteamaddr,eteamArray);
        eteamActiveSize = eteamArray.length;
        updateMappingUserInfo(eteamAddress,_eteamaddr);

        stakeHolderFundTimelock = _stakeHolderFundTimelock;
        companyaddr = _companyaddr;
    }

    //event NewRequest(uint);
    event fundRequest(uint);
    //Load the mapping for first few ELP
    function updateELPInfo(ELPInfo[] memory init,ELPInfo[] storage mainArray) internal {
        uint256 length = init.length;
        //Set the active size for ELP
        elpActiveSize = length;
        for (uint i = 0 ; i < length; i++){
            address walletAddress = init[i].walletAddress;
            uint index = init[i].index;
            uint point = init[i].allocPoint;
            bool status = init[i].statusActive;
            ELPInfo memory e = ELPInfo({
                walletAddress:walletAddress,
                index: index,
                allocPoint: point,
                statusActive: status});

            //store in array checker address. Index will be -1 to represent the position.
            mainArray.push(e);
        }
        
    }
    function updateMappingELPInfo(mapping(address => uint) storage map,ELPInfo[] memory init) internal{
        // Add all the users into the address
        for (uint i = 0 ; i < init.length; i++){
            // Retrieve wallet address
            address walletAddress = init[i].walletAddress;
            //store in map.
            uint index = i + 1;
            map[walletAddress] = index;
        }
    }
    function updateUserInfo(UserInfo[] memory init,UserInfo[] storage mainArray) internal {
        uint256 length = init.length;
        for (uint i = 0 ; i < length; i++){
            address walletAddress = init[i].walletAddress;
            uint index = init[i].index;
            bool statusActive = init[i].statusActive;
            UserInfo memory e = UserInfo({
                walletAddress: walletAddress,
                index: index,
                statusActive: statusActive});

            //store in array checker address. Index will be -1 to represent the position.
            mainArray.push(e);
        }
    }

    //Initialize the mapping
    function updateMappingUserInfo(mapping(address => uint) storage map,UserInfo[] memory init) internal{
        // Add all the users into the address
        for (uint i = 0 ; i < init.length; i++){
            // Retrieve wallet address
            address walletAddress = init[i].walletAddress;
            //store in map.
            uint index = i + 1;
            map[walletAddress] = index;
        }
    }


    function getTotalAdv() onlyOwner external view returns(uint){
        return advArray.length;
    }

    function getTotalEteam() onlyOwner external view returns(uint){
        return eteamArray.length;
    }

    function getTotalELP()  external view returns(uint){
        return elpArray.length;
    }

    //calculate total allocation point
    function ELPAllocPoint() internal view returns(uint) {
        uint totalAllocPoint = 0;
        for(uint i = 0 ;i < elpArray.length; i++){
            //calculate only for wallet with active status.
            if(elpArray[i].statusActive == true){
                totalAllocPoint = totalAllocPoint + elpArray[i].allocPoint;
            }
        }
        return totalAllocPoint;
    }

    //Anyone can call it but it will be split to only the people in this address.
    function withdraw() public onlyOwner{
        uint _amount = king.balanceOf(address(this));
        require(_amount > 0, "zero king amount");
        uint amountReal = _amount;
        uint totalAllocPoint = ELPAllocPoint();
        uint balance = amountReal;
        
        //Transfer this amount to this contract address
        uint shFundTimeLock = amountReal.mul(1170).div(3600);
        king.transfer(stakeHolderFundTimelock, shFundTimeLock);
        
        balance = balance.sub(shFundTimeLock);

        // This contract is suppose to get 3600
        // elp supposed to get 1500 out of 3600
        for(uint i = 0 ; i < elpArray.length; i ++){

            //only for active wallet address
            if(elpArray[i].statusActive == true){
                //Actual indiividual ELP amount : Real Amount * AllocationPoint Per ELP/Total Allocation * ELP Share/Total Share 
                uint fund = amountReal.mul(elpArray[i].allocPoint).mul(1500).div(totalAllocPoint.mul(3600));
                balance = balance.sub(fund);
                king.transfer(elpArray[i].walletAddress, fund);
            }
        }
        
        // Advisor suppose to get 100 out of 3600 : Real Amount * Advisor Share/Totalshare
        for(uint i = 0 ; i < advArray.length; i ++){

            //only for active advisor wallet address
            if(advArray[i].statusActive == true){
                //based total advisor in team divide equally
                uint advFund = amountReal.mul(100).div((advActiveSize).mul(3600));
                balance = balance.sub(advFund);
                king.transfer(advArray[i].walletAddress, advFund);
            }
        }
        
        // Eteam suppose to get 250 out of 3600
        for(uint i = 0 ; i < eteamArray.length; i ++){

            //only for active eteam wallet address
            if(eteamArray[i].statusActive == true){

                //based total team members in team divide equally
                uint eteamFund = amountReal.mul(250).div((eteamActiveSize).mul(3600));
                 emit fundRequest(eteamFund);
                balance = balance.sub(eteamFund);
                king.transfer(eteamArray[i].walletAddress, eteamFund);
            }
        }
        //emit balanceRequest(balance);
        
        //Company suppose to get 580 out 3600
        king.transfer(companyaddr,balance);
    }
    //event balanceRequest(uint);
    function addAdvAddress(address _advAddress) public onlyOwner{
        if(advAddress[_advAddress]==0){
            uint index = advArray.length;
            if(advArray.length == 0){
                index = 1;
            }
            //Index need to plus as it takes the length
            advAddress[_advAddress] = index+1;
            require(advArray.length <=100 , "AdvArray reach 100 limit");
            advArray.push(UserInfo({
                walletAddress: _advAddress,
                index: index,
                statusActive: true}));
                advActiveSize = advActiveSize + 1;
        }
    }

    function addelpAddress(address _elpAddress,uint256 _point) public onlyOwner{
        if(elpAddress[_elpAddress]==0){
            uint index = elpArray.length;
            if(elpArray.length == 0){
                index = 1;
            }
            elpAddress[_elpAddress] = index-1;
            require(elpArray.length <=100 , "elpArray reach 100 limit");
            elpArray.push(ELPInfo({
                walletAddress: _elpAddress,
                index: index,
                allocPoint: _point,
                statusActive : true}));
                elpActiveSize = elpActiveSize + 1;
        }
    }

    function addeteamAddress(address _eteamAddress) public onlyOwner{
        if(eteamAddress[_eteamAddress]==0){
            uint index = eteamArray.length;
            if(eteamArray.length == 0){
                index = 1;
            }
            eteamAddress[_eteamAddress] = index+1;
            require(eteamArray.length <=100 , "eteamArray reach 100 limit");
            eteamArray.push(UserInfo({
                walletAddress: _eteamAddress,
                index: index,
                statusActive: true}));
                eteamActiveSize = eteamActiveSize +1;
        }
    }


    // Disabled adv address from advArray by setting statusActive to false
    function removeAdvAddress(address _advAddress) public onlyOwner{
         if(advAddress[_advAddress]>0){
             for(uint i = 0; i < advArray.length ; i++){
                 if(advArray[i].walletAddress == _advAddress){
                    advArray[i].statusActive = false;
                 }
             }
            advActiveSize = advActiveSize - 1;
         }
    }

    // Disabled eteam address from eteamArray by setting statusActive to false
    function removeEteamAddress(address _eteamAddress) public onlyOwner{
          if(eteamAddress[_eteamAddress]>0){
             for(uint i = 0; i < eteamArray.length ; i++){
                 if(eteamArray[i].walletAddress == _eteamAddress){
                    eteamArray[i].statusActive = false;
                 }
             }
            eteamActiveSize = eteamActiveSize - 1;
         }
    }

    // Disabled eteam address from eteamArray by setting statusActive to false
    function removElpAddress(address _elpAddress) public onlyOwner{
          if(elpAddress[_elpAddress]>0){
             for(uint i = 0; i < elpArray.length ; i++){
                 if(elpArray[i].walletAddress == _elpAddress){
                    elpArray[i].statusActive = false;
                 }
             }
             elpActiveSize = elpActiveSize - 1;
         }
    }

    function changeStakeHolderFundTimeLock(address _stakeHolderFundTimelock) public onlyOwner{
       stakeHolderFundTimelock = _stakeHolderFundTimelock;
    } 

}
// File: contracts/StakeHolderFundTimelock.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./KingToken.sol";

contract StakeHolderFundTimeLock is Ownable {
    using SafeMath for uint;

    struct UserInfo{
        address walletAddress;
        // Assume it as ID rather than Index, will be index-1 in the Array *important*
        uint index;
        // Inactive would mean the wallet will not recieve token
        bool statusActive;
    }

    // the king token
    KingToken public king;
    // last withdraw block, use kingswap online block as default
    uint public lastWithdrawBlock = 0;
    // withdraw interval ~ 1 weeks
    uint public constant WITHDRAW_INTERVAL = 40320;
    // total amount for Co and Founder
    uint public constant TOTAL_WITHDRAWAL_AMT_PER_INTERVAL = 2340000;


    // Co-founder Address.
    mapping(address => uint) public cofdrAddress;
    UserInfo[] public cofdrArray;
    uint cofdrActiveSize;
    // Founder Address.
    address public fdraddr;

    //Default Constructor
    constructor(KingToken _king,
     UserInfo[] memory _cofdrAddress,
     address _fdraddr)
    public{
        king = _king;
        updateUserInfo(_cofdrAddress,cofdrArray);
        updateMappingUserInfo(cofdrAddress,_cofdrAddress);
        fdraddr = _fdraddr;
    }

    function updateUserInfo(UserInfo[] memory init,UserInfo[] storage mainArray) internal {
        uint256 length = init.length;
        cofdrActiveSize = length;
        for (uint i = 0 ; i < length; i++){
            address walletAddress = init[i].walletAddress;
            uint index = init[i].index;
            bool statusActive = init[i].statusActive;
            UserInfo memory e = UserInfo({
                walletAddress: walletAddress,
                index: index,
                statusActive: statusActive});

            //store in array checker address. Index will be -1 to represent the position.
            mainArray.push(e);
        }
    }

    function updateMappingUserInfo(mapping(address => uint) storage map,UserInfo[] memory init) internal{
        // Add all the users into the address
        for (uint i = 0 ; i < init.length; i++){
            // Retrieve wallet address
            address walletAddress = init[i].walletAddress;
            //store in map.
            uint index = i + 1;
            map[walletAddress] = index;
        }
    }

    //Anyone can call it but it will be split to only the people in this address.
    function withdraw() public onlyOwner{
        uint unlockBlock = lastWithdrawBlock.add(WITHDRAW_INTERVAL);
        require(block.number >= unlockBlock, "king locked");
        uint _amount = king.balanceOf(address(this));
        require(_amount > 0, "zero king amount");
        uint amountReal = _amount;
        uint multiplier = (block.number.sub(lastWithdrawBlock)).div(WITHDRAW_INTERVAL);
        amountReal = TOTAL_WITHDRAWAL_AMT_PER_INTERVAL; 
        if(multiplier > 1){
            amountReal = amountReal.mul(multiplier);
        }
        require (_amount > amountReal, "king less than allowed withdrawal amount");
        uint balance = amountReal;  
        lastWithdrawBlock = block.number;
        
        // cofounder suppose to get 720 out of 1170
        for(uint i = 0 ; i < cofdrArray.length; i ++){

            //only for active eteam wallet address
            if(cofdrArray[i].statusActive == true){
                //based total team members in team divide equally
                uint cofdrFund = amountReal.mul(720).div((cofdrActiveSize).mul(1170));
                balance = balance.sub(cofdrFund);
                king.transfer(cofdrArray[i].walletAddress, cofdrFund);
            }
        }
        //emit balanceRequest(balance);
        
        //Company suppose to get 450 out 1170
        king.transfer(fdraddr,balance);
    }

     function addcofdrAddress(address _cofdrAddress) public onlyOwner{
        if(cofdrAddress[_cofdrAddress]==0){
            uint index = cofdrArray.length;
            if(cofdrArray.length == 0){
                index = 1;
            }
            cofdrAddress[_cofdrAddress] = index+1;
            require(cofdrArray.length <=100 , "cofdrArray reach 100 limit");
            cofdrArray.push(UserInfo({
                walletAddress: _cofdrAddress,
                index: index,
                statusActive: true}));
            
            //increase the total number of co-founder active
            cofdrActiveSize = cofdrActiveSize + 1;
        }
    }

    function removecofdrAddress(address _cofdrAddress) public onlyOwner{
        if(cofdrAddress[_cofdrAddress]>0){
            for(uint i = 0; i < cofdrArray.length ; i++){
                if(cofdrArray[i].walletAddress == _cofdrAddress){
                    cofdrArray[i].statusActive = false;
                }
            }
            //increase the total number of co-founder active
            cofdrActiveSize = cofdrActiveSize - 1;
        }
    }

    function changCoFounder(address _fdraddr) public onlyOwner{
       fdraddr = _fdraddr;
    }

    function emergencyWithdraw() public onlyOwner{

    } 


}