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// Copyright 2020 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title Cartesi Staking
/// @author Felipe Argento
pragma solidity ^0.7.0;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./Staking.sol";

contract StakingImpl is Staking {
    using SafeMath for uint256;
    IERC20 private ctsi;

    uint256 timeToStake; // time it takes for deposited tokens to become staked.
    uint256 timeToRelease; // time it takes from witdraw signal to tokens to be unlocked.

    mapping(address => uint256) staked; // amount of money being staked.
    mapping(address => MaturationStruct) maturing; // deposits waiting to be staked.
    mapping(address => MaturationStruct) releasing; // money waiting for withdraw.

    struct MaturationStruct {
        uint256 amount;
        uint256 timestamp;
    }

    /// @notice constructor
    /// @param _ctsiAddress address of compatible ERC20
    /// @param _timeToStake time it takes for deposited tokens to become staked.
    /// @param _timeToRelease time it takes from unstake to tokens being unlocked.
    constructor(
        address _ctsiAddress,
        uint256 _timeToStake,
        uint256 _timeToRelease
    ) {
        ctsi = IERC20(_ctsiAddress);
        timeToStake = _timeToStake;
        timeToRelease = _timeToRelease;
    }

    function stake(uint256 _amount) public override {
        require(_amount > 0, "amount cant be zero");

        // pointers to releasing/maturing structs
        MaturationStruct storage r = releasing[msg.sender];
        MaturationStruct storage m = maturing[msg.sender];

        // check if there are mature coins to be staked
        if (m.timestamp.add(timeToStake) <= block.timestamp) {
            staked[msg.sender] = staked[msg.sender].add(m.amount);
            m.amount = 0;
        }

        // first move tokens from releasing pool to maturing
        // then transfer from wallet
        if (r.amount >= _amount) {
            r.amount = (r.amount).sub(_amount);
        } else {
            // transfer stake to contract
            // from: msg.sender
            // to: this contract
            // value: _amount - releasing[msg.sender].amount
            ctsi.transferFrom(msg.sender, address(this), _amount.sub(r.amount));
            r.amount = 0;

        }

        m.amount = (m.amount).add(_amount);
        m.timestamp = block.timestamp;

        emit Stake(
            msg.sender,
            m.amount,
            block.timestamp.add(timeToStake)
        );
    }

    function unstake(uint256 _amount) public override {
        require(_amount > 0, "amount cant be zero");

        // pointers to releasing/maturing structs
        MaturationStruct storage r = releasing[msg.sender];
        MaturationStruct storage m = maturing[msg.sender];

        if (m.amount >= _amount) {
            m.amount = (m.amount).sub(_amount);
        } else {
            // safemath.sub guarantees that _amount <= m.amount + staked amount
            staked[msg.sender] = staked[msg.sender].sub(_amount.sub(m.amount));
            m.amount = 0;
        }
        // update releasing amount
        r.amount = (r.amount).add(_amount);
        r.timestamp = block.timestamp;

        emit Unstake(
            msg.sender,
            r.amount,
            block.timestamp.add(timeToRelease)
        );
    }

    function withdraw(uint256 _amount) public override {
        // pointer to releasing struct
        MaturationStruct storage r = releasing[msg.sender];

        require(_amount > 0, "amount cant be zero");
        require(
            r.timestamp.add(timeToRelease) <= block.timestamp,
            "tokens are not yet ready to be released"
        );

        r.amount = (r.amount).sub(_amount, "not enough tokens waiting to be released;");

        // withdraw tokens
        // from: this contract
        // to: msg.sender
        // value: bet total withdraw value on toWithdraw
        ctsi.transfer(msg.sender, _amount);
        emit Withdraw(msg.sender, _amount);
    }

    // getters
    function getMaturingTimestamp(
        address _userAddress
    )
    public
    view override
    returns (uint256)
    {
        return maturing[_userAddress].timestamp.add(timeToStake);
    }

    function getMaturingBalance(
        address _userAddress
    )
    public
    view override
    returns (uint256)
    {
        MaturationStruct storage m = maturing[_userAddress];

        if (m.timestamp.add(timeToStake) <= block.timestamp) {
            return 0;
        }

        return m.amount;
    }

    function getReleasingBalance(
        address _userAddress
    )
    public
    view override
    returns (uint256)
    {
        return releasing[_userAddress].amount;
    }

    function getReleasingTimestamp(
        address _userAddress
    )
    public
    view override
    returns (uint256)
    {
        return releasing[_userAddress].timestamp.add(timeToRelease);
    }

    function getStakedBalance(address _userAddress)
    public
    view override
    returns (uint256)
    {
        MaturationStruct storage m = maturing[_userAddress];

        // if there are mature deposits, treat them as staked
        if (m.timestamp.add(timeToStake) <= block.timestamp) {
            return staked[_userAddress].add(m.amount);
        }

        return staked[_userAddress];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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);
}

// Copyright 2020 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title Interface staking contract
pragma solidity ^0.7.0;

interface Staking {

    /// @notice Returns total amount of tokens counted as stake
    /// @param _userAddress user to retrieve staked balance from
    /// @return finalized staked of _userAddress
    function getStakedBalance(
        address _userAddress) external view returns (uint256);

    /// @notice Returns the timestamp when next deposit can be finalized
    /// @return timestamp of when finalizeStakes() is callable
    function getMaturingTimestamp(address _userAddress) external view returns (uint256);

    /// @notice Returns the timestamp when next withdraw can be finalized
    /// @return timestamp of when finalizeWithdraw() is callable
    function getReleasingTimestamp(address _userAddress) external view returns (uint256);


    /// @notice Returns the balance waiting/ready to be matured
    /// @return amount that will get staked after finalization
    function getMaturingBalance(address _userAddress) external view  returns (uint256);

    /// @notice Returns the balance waiting/ready to be released
    /// @return amount that will get withdrew after finalization
    function getReleasingBalance(address _userAddress) external view  returns (uint256);


    /// @notice Deposit CTSI to be staked. The money will turn into staked
    ///         balance after timeToStake days
    /// @param _amount The amount of tokens that are gonna be deposited.
    function stake(uint256 _amount) external;

    /// @notice Remove tokens from staked balance. The money can
    ///         be released after timeToRelease seconds, if the
    ///         function withdraw is called.
    /// @param _amount The amount of tokens that are gonna be unstaked.
    function unstake(uint256 _amount) external;

    /// @notice Transfer tokens to user's wallet.
    /// @param _amount The amount of tokens that are gonna be transferred.
    function withdraw(uint256 _amount) external;

    // events
    /// @notice CTSI tokens were deposited, they count as stake after _maturationDate
    /// @param user address of msg.sender
    /// @param amount amount deposited for staking
    /// @param maturationDate date when the stake can be finalized
    event Stake(
        address indexed user,
        uint256 amount,
        uint256 maturationDate
    );

    /// @notice Unstake tokens, moving them to releasing structure
    /// @param user address of msg.sender
    /// @param amount amount of tokens to be released
    /// @param maturationDate date when the tokens can be withdrew
    event Unstake(
        address indexed user,
        uint256 amount,
        uint256 maturationDate
    );

    /// @notice Withdraw process was finalized
    /// @param user address of msg.sender
    /// @param amount amount of tokens withdrawn
    event Withdraw(
        address indexed user,
        uint256 amount
    );
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_ctsiAddress","type":"address"},{"internalType":"uint256","name":"_timeToStake","type":"uint256"},{"internalType":"uint256","name":"_timeToRelease","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maturationDate","type":"uint256"}],"name":"Stake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maturationDate","type":"uint256"}],"name":"Unstake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getMaturingBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getMaturingTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getReleasingBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getReleasingTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getStakedBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000491604c0fdf08347dd1fa4ee062a822a5dd06b5d0000000000000000000000000000000000000000000000000000000000001c20000000000000000000000000000000000000000000000000000000000002a300

-----Decoded View---------------
Arg [0] : _ctsiAddress (address): 0x491604c0FDF08347Dd1fa4Ee062a822A5DD06B5D
Arg [1] : _timeToStake (uint256): 7200
Arg [2] : _timeToRelease (uint256): 172800

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000491604c0fdf08347dd1fa4ee062a822a5dd06b5d
Arg [1] : 0000000000000000000000000000000000000000000000000000000000001c20
Arg [2] : 000000000000000000000000000000000000000000000000000000000002a300