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/**
* SPDX-License-Identifier: LicenseRef-Aktionariat
*
* MIT License with Automated License Fee Payments
*
* Copyright (c) 2020 Aktionariat AG (aktionariat.com)
*
* Permission is hereby granted to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies of the
* Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* - The above copyright notice and this permission notice shall be included in
*   all copies or substantial portions of the Software.
* - All automated license fee payments integrated into this and related Software
*   are preserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
pragma solidity >=0.8;

import "./Offer.sol";

/**
 * @title CompanyName Shareholder Agreement
 * @author Luzius Meisser, [email protected]
 * @dev These tokens are based on the ERC20 standard and the open-zeppelin library.
 *
 * This is an ERC-20 token representing shares of CompanyName AG that are bound to
 * a shareholder agreement that can be found at the URL defined in the constant 'terms'
 * of the 'DraggableCompanyNameShares' contract. The agreement is partially enforced
 * through the Swiss legal system, and partially enforced through this smart contract.
 * In particular, this smart contract implements a drag-along clause which allows the
 * majority of token holders to force the minority sell their shares along with them in
 * case of an acquisition. That's why the tokens are called "Draggable CompanyName AG Shares."
 */

contract OfferFactory {

    function predict(bytes32 salt, address buyer, address token, uint256 pricePerShare, address currency, uint256 quorum, uint256 votePeriod) public view returns (address) {
        bytes32 initCodeHash = keccak256(abi.encodePacked(type(Offer).creationCode, abi.encode(buyer, token, pricePerShare, currency, quorum, votePeriod)));
        bytes32 hashResult = keccak256(abi.encodePacked(bytes1(0xff), address(this), salt, initCodeHash));
        return address(uint160(uint256(hashResult)));
    }

    // Do not call directly, msg.sender must be the token to be acquired
    function create(bytes32 salt, address buyer, uint256 pricePerShare, address currency, uint256 quorum, uint256 votePeriod) public payable returns (address) {
        Offer offer = new Offer{value: msg.value, salt: salt}(buyer, msg.sender, pricePerShare, currency, quorum, votePeriod);
        return address(offer);
    }

}

/**
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2016-2019 zOS Global Limited
*
*/
pragma solidity >=0.8;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */

interface IERC20 {

    // Optional functions
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    /**
     * @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.
     *
     * > 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);
}

/**
* SPDX-License-Identifier: LicenseRef-Aktionariat
*
* MIT License with Automated License Fee Payments
*
* Copyright (c) 2020 Aktionariat AG (aktionariat.com)
*
* Permission is hereby granted to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies of the
* Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* - The above copyright notice and this permission notice shall be included in
*   all copies or substantial portions of the Software.
* - All automated license fee payments integrated into this and related Software
*   are preserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
pragma solidity >=0.8;

import "./IERC20.sol";

/**
 * @title Acquisition Attempt
 * @author Luzius Meisser, [email protected]
 */

contract Offer {

    uint256 public quorum;                              // Percentage of votes needed to start drag-along process

    address public token;
    address public buyer;                               // who made the offer
    
    address public currency;
    uint256 public price;                               // the price offered per share

    enum Vote { NONE, YES, NO }                         // Used internally, represents not voted yet or yes/no vote.
    mapping (address => Vote) private votes;            // Who votes what
    uint256 public noVotes;                             // number of tokens voting for no
    uint256 public yesVotes;                            // number of tokens voting for yes
    uint256 public voteEnd;

    event VotesChanged(uint256 newYesVotes, uint256 newNoVotes);
    event OfferCreated(address indexed buyer, address token, uint256 pricePerShare, address currency);
    event OfferEnded(address indexed buyer, bool success, string message);

    constructor (address buyer_, address token_, uint256 price_, address currency_, uint256 quorum_, uint256 votePeriod) payable {
        buyer = buyer_;
        token = token_;
        currency = currency_;
        price = price_;
        quorum = quorum_;
        voteEnd = block.timestamp + votePeriod;
        // License Fee to Aktionariat AG, also ensures that offer is serious.
        // Any circumvention of this license fee payment is a violation of the copyright terms.
        payable(0x29Fe8914e76da5cE2d90De98a64d0055f199d06D).transfer(3 ether);
        emit OfferCreated(buyer, token, price, currency);
    }

    function contest(address betterOffer) public {
        require(msg.sender == token);
        Offer better = Offer(betterOffer);
        require(currency == better.currency() && better.price() > price, "New offer must be better");
        kill(false, "replaced");
    }

    function hasExpired() internal view returns (bool) {
        return block.timestamp > voteEnd + 3 days; // buyer has three days to complete acquisition after voting ends
    }

    function contest() public {
        if (hasExpired()) {
            kill(false, "expired");
        } else if (isDeclined()) {
            kill(false, "declined");
        } else if (!isWellFunded()) {
            kill(false, "lack of funds");
        }
    }

    function cancel() public {
        require(msg.sender == buyer);
        kill(false, "cancelled");
    }

    function execute() public {
        require(isAccepted(), "not accepted");
        uint256 totalPrice = getTotalPrice();
        require(IERC20(currency).transferFrom(buyer, token, totalPrice));
        IDraggable(token).drag(buyer, currency);
        kill(true, "success");
    }

    function getTotalPrice() internal view returns (uint256) {
        IERC20 tok = IERC20(token);
        return (tok.totalSupply() - tok.balanceOf(buyer)) * price;
    }

    function isWellFunded() public view returns (bool) {
        IERC20 cur = IERC20(currency);
        uint256 buyerBalance = cur.balanceOf(buyer);
        uint256 buyerAllowance = cur.allowance(buyer, address(this));
        uint256 totalPrice = getTotalPrice();
        return totalPrice <= buyerBalance && totalPrice <= buyerAllowance;
    }

    function isAccepted() public view returns (bool) {
        if (isVotingOpen()) {
            // is it already clear that 75% will vote yes even though the vote is not over yet?
            return yesVotes * 10000  >= quorum * IERC20(token).totalSupply();
        } else {
            // did 75% of all cast votes say 'yes'?
            return yesVotes * 10000 >= quorum * (yesVotes + noVotes);
        }
    }

    function isDeclined() public view returns (bool) {
        if (isVotingOpen()) {
            // is it already clear that 25% will vote no even though the vote is not over yet?
            return (IERC20(token).totalSupply() - noVotes) * 10000 < quorum * IERC20(token).totalSupply();
        } else {
            // did quorum% of all cast votes say 'no'?
            return 10000 * yesVotes < quorum * (yesVotes + noVotes);
        }
    }

    function notifyMoved(address from, address to, uint256 value) public {
        require(msg.sender == token);
        if (isVotingOpen()) {
            Vote fromVoting = votes[from];
            Vote toVoting = votes[to];
            update(fromVoting, toVoting, value);
        }
    }

    function update(Vote previousVote, Vote newVote, uint256 votes_) internal {
        if (previousVote != newVote) {
            if (previousVote == Vote.NO) {
                noVotes = noVotes - votes_;
            } else if (previousVote == Vote.YES) {
                yesVotes = yesVotes - votes_;
            }
            if (newVote == Vote.NO) {
                noVotes = noVotes + votes_;
            } else if (newVote == Vote.YES) {
                yesVotes = yesVotes + votes_;
            }
            emit VotesChanged(yesVotes, noVotes);
        }
    }

    function isVotingOpen() public view returns (bool) {
        return block.timestamp <= voteEnd;
    }

    modifier votingOpen() {
        require(isVotingOpen(), "vote ended");
        _;
    }

    function voteYes() public {
        vote(Vote.YES);
    }

    function voteNo() public { 
        vote(Vote.NO);
    }

    function vote(Vote newVote) internal votingOpen() {
        Vote previousVote = votes[msg.sender];
        votes[msg.sender] = newVote;
        update(previousVote, newVote, IERC20(token).balanceOf(msg.sender));
    }

    function hasVotedYes(address voter) public view returns (bool) {
        return votes[voter] == Vote.YES;
    }

    function hasVotedNo(address voter) public view returns (bool) {
        return votes[voter] == Vote.NO;
    }

    function kill(bool success, string memory message) internal {
        IDraggable(token).notifyOfferEnded();
        emit OfferEnded(buyer, success, message);
        selfdestruct(payable(buyer));
    }

}

abstract contract IDraggable {

    function drag(address buyer, address currency) public virtual;
    function notifyOfferEnded() public virtual;

}

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[{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"address","name":"buyer","type":"address"},{"internalType":"uint256","name":"pricePerShare","type":"uint256"},{"internalType":"address","name":"currency","type":"address"},{"internalType":"uint256","name":"quorum","type":"uint256"},{"internalType":"uint256","name":"votePeriod","type":"uint256"}],"name":"create","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"address","name":"buyer","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"pricePerShare","type":"uint256"},{"internalType":"address","name":"currency","type":"address"},{"internalType":"uint256","name":"quorum","type":"uint256"},{"internalType":"uint256","name":"votePeriod","type":"uint256"}],"name":"predict","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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