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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../stablecoin/IFrankencoin.sol";
import "../rate/Leadrate.sol";
import "./AbstractSavings.sol";

/**
 * @title Savings
 *
 * Module to enable savings based on a Leadrate ("Leitzins") module on mainnet.
 */
contract Savings is Leadrate, AbstractSavings {

    constructor(IFrankencoin zchf_, uint24 initialRatePPM) AbstractSavings(zchf_) Leadrate(zchf_.reserve(), initialRatePPM) {
    }

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IGovernance {
   function checkQualified(address sender, address[] calldata helpers) external view;
}

struct SyncVote {
    address voter;
    uint256 votes;
    address delegatee;
}

struct SyncMessage {
    SyncVote[] votes;
    uint256 totalVotes;
}

/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2016-2019 zOS Global Limited
 *
 */
pragma solidity ^0.8.0;

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

interface IERC20 {
    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 always true. Throws error on failure.
     *
     * 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 can change 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 always true. Throws error on failure.
     *
     * 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: MIT
pragma solidity ^0.8.0;

import "../erc20/IERC20.sol";
import "../stablecoin/IFrankencoin.sol";

interface IPosition {

    function initialize(address parent, uint40 _expiration) external;

    function hub() external view returns(address);

    function original() external view returns (address);

    function collateral() external view returns (IERC20);

    function minimumCollateral() external view returns (uint256);

    function challengePeriod() external view returns (uint40);

    function expiration() external view returns (uint40);

    function price() external view returns (uint256);

    function deny(address[] calldata helpers, string calldata message) external;

    function mint(address target, uint256 amount) external;

    function repay(uint256 amount) external returns (uint256);

    function adjust(uint256 newMinted, uint256 newCollateral, uint256 newPrice) external;

    function minted() external view returns (uint256);

    function availableForMinting() external view returns (uint256);

    function reserveContribution() external view returns (uint24);

    function withdrawCollateral(address target, uint256 amount) external;

    function getUsableMint(uint256 totalMint, bool beforeFees) external view returns (uint256);

    function getMintAmount(uint256 usableMint) external view returns (uint256);

    function challengeData() external view returns (uint256 liqPrice, uint40 phase);

    function notifyChallengeStarted(uint256 size) external;

    function notifyChallengeAverted(uint256 size) external;

    function notifyChallengeSucceeded(address _bidder, uint256 _size) external returns (address, uint256, uint256, uint32);

    function forceSale(address buyer, uint256 collAmount, uint256 proceeds) external;

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../erc20/IERC20.sol";
import "../stablecoin/IFrankencoin.sol";
import "../minting/IPosition.sol";

/**
 * @title Leadrate (attempt at translating the nicely concise German term 'Leitzins')
 *
 * A module that can provide other modules with the lead interest rate for the system.
 * 
 * This is an abstract module that is agnostic about the way the lead rate is updated.
 *
 **/
abstract contract AbstractLeadrate {

    // the following five variables are less than 256 bit so they should be stored
    // in the same slot, making them cheap to access together, right?

    uint24 public currentRatePPM; // 24 bit allows rates of up to 1670% per year

    uint40 private anchorTime; // 40 bits for time in seconds spans up to 1000 human generations
    uint64 private ticksAnchor; // in bips * seconds, uint88 allows up to

    event RateChanged(uint24 newRate);

    constructor(uint24 initialRatePPM) {
        currentRatePPM = initialRatePPM;
        anchorTime = uint40(block.timestamp);
        ticksAnchor = 0;
        emit RateChanged(initialRatePPM); // emit for init indexing, if wanted
    }

    /**
     * Setting a previously proposed interest rate change into force.
     */
    function updateRate(uint24 rate) internal {
        uint40 timeNow = uint40(block.timestamp);
        ticksAnchor += (timeNow - anchorTime) * currentRatePPM;
        anchorTime = timeNow;
        currentRatePPM = rate;
        emit RateChanged(rate);
    }

    /**
     * Total accumulated 'interest ticks' since this contract was deployed.
     * One 'tick' is a ppm-second, so one months of 12% annual interest is
     *   120000*30*24*3600 = 311040000000 ticks.
     * Two months of 6% annual interest would result in the same number of
     * ticks. For simplicity, this is linear, so there is no "interest on interest".
     */
    function currentTicks() public view returns (uint64) {
        return ticks(block.timestamp);
    }

    function ticks(uint256 timestamp) public view returns (uint64) {
        return ticksAnchor + (uint64(timestamp) - anchorTime) * currentRatePPM;
    }

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../erc20/IERC20.sol";
import "../stablecoin/IFrankencoin.sol";
import "../minting/IPosition.sol";
import "../equity/IGovernance.sol";
import "./AbstractLeadrate.sol";

/**
 * @title Leadrate (attempt at translating the nicely concise German term 'Leitzins')
 *
 * A module that can provide other modules with the lead interest rate for the system.
 *
 **/
contract Leadrate is AbstractLeadrate {

    IGovernance public immutable equity;

    // the following five variables are less than 256 bit so they should be stored
    // in the same slot, making them cheap to access together, right?

    uint24 public nextRatePPM;
    uint40 public nextChange;

    event RateProposed(address who, uint24 nextRate, uint40 nextChange);
    error NoPendingChange();
    error ChangeNotReady();

    constructor(IGovernance equity_, uint24 initialRatePPM) AbstractLeadrate(initialRatePPM) {
        equity = equity_;
        nextRatePPM = initialRatePPM;
        nextChange = uint40(block.timestamp);
    }

    /**
     * Proposes a new interest rate that will automatically be applied after seven days.
     * To cancel a proposal, just overwrite it with a new one proposing the current rate.
     */
    function proposeChange(uint24 newRatePPM_, address[] calldata helpers) external {
        equity.checkQualified(msg.sender, helpers);
        nextRatePPM = newRatePPM_;
        nextChange = uint40(block.timestamp + 7 days);
        emit RateProposed(msg.sender, nextRatePPM, nextChange);
    }

    /**
     * Setting a previously proposed interest rate change into force.
     */
    function applyChange() external {
        if (currentRatePPM == nextRatePPM) revert NoPendingChange();
        uint40 timeNow = uint40(block.timestamp);
        if (timeNow < nextChange) revert ChangeNotReady();
        super.updateRate(nextRatePPM);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../stablecoin/IFrankencoin.sol";
import "../rate/AbstractLeadrate.sol";

/**
 * @title Savings
 *
 * Module to enable savings based on a Leadrate ("Leitzins") module.
 *
 * As the interest rate changes, the speed at which 'ticks' are accumulated is
 * adjusted. The ticks counter serves as the basis for calculating the interest
 * due for the individual accoutns.
 *
 * The saved ZCHF are subject to a lockup of up to 3 days and only start to yield
 * an interest after the lockup ended. The purpose of this lockup is to discourage
 * short-term holdings and to avoid paying interest to transactional accounts.
 * Transactional accounts typically do not need an incentive to hold Frankencoins.
 */
abstract contract AbstractSavings is AbstractLeadrate {
    
    uint64 public immutable INTEREST_DELAY = uint64(3 days);

    IFrankencoin public immutable ZCHF;

    mapping(address => Account) public savings;

    struct Account {
        uint192 saved;
        uint64 ticks;
        address referrer;
        uint32 referralFeePPM;
    }

    event Saved(address indexed account , uint192 amount);
    event InterestCollected(address indexed account, uint256 interest, uint256 referrerFee);
    event Withdrawn(address indexed account, uint192 amount);

    error FundsLocked(uint40 remainingSeconds);

    // The module is considered disabled if the interest is zero or about to become zero within three days.
    error ModuleDisabled();

    error ReferralFeeTooHigh(uint32 fee);

    constructor(IFrankencoin zchf){
        ZCHF = zchf;
    }

    /**
     * Shortcut for refreshBalance(msg.sender)
     */
    function refreshMyBalance() public returns (uint192) {
        return refreshBalance(msg.sender);
    }

    /**
     * Collects the accrued interest and adds it to the account.
     *
     * It can be beneficial to do so every now and then in order to start collecting
     * interest on the accrued interest.
     */
    function refreshBalance(address owner) public returns (uint192) {
        return refresh(owner).saved;
    }

    function refresh(address accountOwner) internal returns (Account storage) {
        Account storage account = savings[accountOwner];
        uint64 ticks = currentTicks();
        if (ticks > account.ticks) {
            uint192 earnedInterest = calculateInterest(account, ticks);
            if (earnedInterest > 0) {
                // collect interest as you go and trigger accounting event
                ZCHF.coverLoss(address(this), earnedInterest);
                uint192 referralFee = deductTransferReferralFee(account, earnedInterest);
                account.saved += (earnedInterest - referralFee);
                emit InterestCollected(accountOwner, earnedInterest, referralFee);
            }
            account.ticks = ticks;
        }
        return account;
    }

    function accruedInterest(address accountOwner) public view returns (uint192) {
        return accruedInterest(accountOwner, block.timestamp);
    }

    function accruedInterest(address accountOwner, uint256 timestamp) public view returns (uint192) {
        Account memory account = savings[accountOwner];
        return calculateInterest(account, ticks(timestamp));
    }

    function calculateInterest(Account memory account, uint64 ticks) public pure returns (uint192) {
        if (ticks <= account.ticks || account.ticks == 0) {
            return 0;
        } else {
            return uint192((uint256(ticks - account.ticks) * account.saved) / 1000000 / 365 days);
        }
    }
    
    /**
     * Save 'amount'.
     */
    function save(uint192 amount) public {
        save(msg.sender, amount);
    }

    function adjust(uint192 targetAmount) public {
        Account storage balance = refresh(msg.sender);
        if (balance.saved < targetAmount) {
            save(targetAmount - balance.saved);
        } else if (balance.saved > targetAmount) {
            withdraw(msg.sender, balance.saved - targetAmount);
        }
    }

    /**
     * Send 'amount' to the account of the provided owner.
     * The funds sent to the account are locked for a while, depending on how much already is in there.
     */
    function save(address owner, uint192 amount) public {
        if (currentRatePPM == 0) revert ModuleDisabled();
       // if (nextRatePPM == 0 && (nextChange <= block.timestamp + INTEREST_DELAY)) revert ModuleDisabled(); TODO: figure out why this was in there
        Account storage balance = refresh(owner);
        ZCHF.transferFrom(msg.sender, address(this), amount);
        uint64 ticks = currentTicks();
        assert(balance.ticks >= ticks);
        uint256 saved = balance.saved;
        uint64 weightedAverage = uint64(
            (saved * (balance.ticks - ticks) + uint256(amount) * currentRatePPM * INTEREST_DELAY) / (saved + amount)
        );
        balance.saved += amount;
        balance.ticks = ticks + weightedAverage;
        emit Saved(owner, amount);
    }

    /**
     * Withdraw up to 'amount' to the target address.
     * When trying to withdraw more than available, all that is available is withdrawn.
     * Returns the acutally transferred amount.
     */
    function withdraw(address target, uint192 amount) public returns (uint256) {
        Account storage account = refresh(msg.sender);
        if (amount >= account.saved) {
            amount = account.saved;
            delete savings[msg.sender];
        } else {
            account.saved -= amount;
        }
        ZCHF.transfer(target, amount);
        emit Withdrawn(msg.sender, amount);
        return amount;
    }

    /**
     * REFERRAL LOGIC
     * 
     * The following functions can be used by a frontend or wallet contains functions to
     * access the savings features of the Frankencoin system. It allows the frontend or
     * wallet to set a referrer and a referral fee when calling save or adjust, but not
     * when withdrawing. The referral fee can be up to 25% (250'000 ppm). It is deducted
     * from the collected interest.
     * 
     * The user can drop or change the referrer at any time, so the fee is not very sticky.
     * The magnitude of the fee that can be charged mainly depends on how convenient the
     * frontend or wallet is in comparison to the user directly interfering with the system
     * himself. So economically, it really is a frontend fee that can only be charged to
     * the extent that the frontend provides a more convenient way of interaction with the
     * protocol and the users are willing to pay for that convenience.
     */

    /**
     * Save the given amount and set the referrer to earn a fee on the collected interest.
     * 
     * Referral fee is given in parts per million and can be at most 250'000, which is 25%.
     */
    function save(uint192 amount, address referrer, uint24 referralFeePPM) public {
        save(msg.sender, amount);
        setReferrer(referrer, referralFeePPM);
    }

    /**
     * Withdraw the given amount and set the referrer to earn a fee on the collected interest.
     * 
     * Referral fee is given in parts per million and can be at most 250'000, which is 25%.
     */
    function withdraw(uint192 amount, address referrer, uint24 referralFeePPM) public {
        withdraw(msg.sender, amount);
        setReferrer(referrer, referralFeePPM);
    }

    /**
     * Adjust to the given amount and set the referrer to earn a fee on the collected interest.
     * 
     * Referral fee is given in parts per million and can be at most 250'000, which is 25%.
     */
    function adjust(uint192 targetAmount, address referrer, uint24 referralFeePPM) public {
        adjust(targetAmount);
        setReferrer(referrer, referralFeePPM);
    }

    /**
     * Remove the referrer.
     */
    function dropReferrer() public {
        refresh(msg.sender); // pay accrued referral fee before dropping referrer
        setReferrer(address(0x0), 0);
    }

    function setReferrer(address referrer, uint32 referralFeePPM) internal {
        if (referralFeePPM > 250_000) revert ReferralFeeTooHigh(referralFeePPM); // don't allow more than 25%
        savings[msg.sender].referrer = referrer;
        savings[msg.sender].referralFeePPM = referralFeePPM;
    }

    function deductTransferReferralFee(Account memory balance, uint192 earnedInterest) internal returns (uint192) {
        if (balance.referrer != address(0x0)){
            uint256 referralFee = uint256(earnedInterest) * balance.referralFeePPM / 1000000;
            ZCHF.transfer(balance.referrer, referralFee);
            return uint192(referralFee);
        } else {
            return 0;
        }
    }

}

interface IInterestSource {
    function coverLoss(address source, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../erc20/IERC20.sol";
import "../equity/IGovernance.sol";

interface IBasicFrankencoin is IERC20 {
    function MIN_FEE() external view returns (uint256);

    function MIN_APPLICATION_PERIOD() external view returns (uint256);

    function suggestMinter(
        address _minter,
        uint256 _applicationPeriod,
        uint256 _applicationFee,
        string calldata _message
    ) external;

    function registerPosition(address position) external;

    function denyMinter(address minter, address[] calldata helpers, string calldata message) external;

    function reserve() external view returns (IGovernance);

    function isMinter(address minter) external view returns (bool);

    function getPositionParent(address position) external view returns (address);

    function mint(address target, uint256 amount) external;

    function burnFrom(address target, uint256 amount) external;

    function burn(uint256 amount) external;

    function coverLoss(address source, uint256 amount) external;

    function collectProfits(address source, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../equity/IGovernance.sol";
import "./IBasicFrankencoin.sol";

interface IFrankencoin is IBasicFrankencoin {

    function minterReserve() external view returns (uint256);

    function calculateAssignedReserve(uint256 mintedAmount, uint32 _reservePPM) external view returns (uint256);

    function calculateFreedAmount(uint256 amountExcludingReserve, uint32 reservePPM) external view returns (uint256);

    function equity() external view returns (uint256);

    function mintWithReserve(address target, uint256 amount, uint32 reservePPM, uint32 feePPM) external;

    function burnWithoutReserve(uint256 amountIncludingReserve, uint32 reservePPM) external;

    function burnFromWithReserve(address payer, uint256 targetTotalBurnAmount, uint32 _reservePPM) external returns (uint256);

    function burnWithReserve(uint256 amountExcludingReserve, uint32 reservePPM) external returns (uint256);

}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

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000000000000000000000000b58e61c3098d85632df34eecfb899a1ed80921cb0000000000000000000000000000000000000000000000000000000000007530

-----Decoded View---------------
Arg [0] : zchf_ (address): 0xB58E61C3098d85632Df34EecfB899A1Ed80921cB
Arg [1] : initialRatePPM (uint24): 30000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000b58e61c3098d85632df34eecfb899a1ed80921cb
Arg [1] : 0000000000000000000000000000000000000000000000000000000000007530