// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "../interfaces/IDebtToken.sol";
import "../dependencies/YalaOwnable.sol";
import "../interfaces/IPSM.sol";

contract PSM is IPSM, YalaOwnable, Pausable {
	using SafeERC20 for IERC20;

	uint256 public constant DECIMAL_PRECISIONS = 1e18;
	address public immutable override factory;
	IDebtToken public immutable override debtToken;
	IERC20Metadata public override pegToken;
	uint256 public override priceFactor;
	uint256 public override feeIn; // Fee for buying debtToken  (in DECIMAL_PRECISIONS)
	uint256 public override feeOut; // Fee for selling debtToken (in DECIMAL_PRECISIONS)
	uint256 public supplyCap; // Maximum amount of debtToken that can be held by PSM
	uint256 public totalActivedebt;

	constructor(address _yalaCore, address _factory, address _debtToken) YalaOwnable(_yalaCore) {
		factory = _factory;
		debtToken = IDebtToken(_debtToken);
	}

	function initialize(IERC20Metadata _pegToken, uint256 _feeIn, uint256 _feeOut, uint256 _supplyCap) external override {
		require(msg.sender == factory, "PSM: !Factory");
		uint8 pegTokenDecimals = _pegToken.decimals();
		require(pegTokenDecimals <= 18, "PSM: Peg token decimals not supported");
		priceFactor = 10 ** (18 - pegTokenDecimals);
		pegToken = _pegToken;
		_setFeeIn(_feeIn);
		_setFeeOut(_feeOut);
		_setSupplyCap(_supplyCap);
		emit PegTokenUpdated(_pegToken);
	}

	function setFeeIn(uint256 _feeIn) external override onlyOwner {
		_setFeeIn(_feeIn);
	}

	function setFeeOut(uint256 _feeOut) external override onlyOwner {
		_setFeeOut(_feeOut);
	}

	function setSupplyCap(uint256 _supplyCap) external onlyOwner {
		_setSupplyCap(_supplyCap);
	}

	// New functions for pausing and unpausing
	function pause() external onlyOwner {
		_pause();
	}

	function unpause() external onlyOwner {
		_unpause();
	}

	function buy(uint256 amountPegToken) external override whenNotPaused returns (uint256 amountDebtTokenReceived, uint256 fee) {
		require(amountPegToken > 0, "PSM: Amount peg token must be greater than 0");
		(amountDebtTokenReceived, fee) = estimateBuy(amountPegToken);
		require(totalActivedebt + amountDebtTokenReceived <= supplyCap, "PSM: Supply cap reached");
		if (feeIn > 0) require(fee > 0, "PSM: Fee must be greater than 0");
		IERC20(pegToken).safeTransferFrom(msg.sender, address(this), amountPegToken);
		debtToken.mint(msg.sender, amountDebtTokenReceived);
		if (fee > 0) debtToken.mint(YALA_CORE.feeReceiver(), fee);
		totalActivedebt = totalActivedebt + amountDebtTokenReceived + fee;

		emit Buy(msg.sender, amountDebtTokenReceived, amountPegToken, fee);
	}

	function sell(uint256 amountDebtToken) external override whenNotPaused returns (uint256 amountPegTokenReceived, uint256 fee) {
		require(amountDebtToken > 0, "PSM: Amount debt token must be greater than 0");
		(amountPegTokenReceived, fee) = estimateSell(amountDebtToken);
		if (feeOut > 0) require(fee > 0, "PSM: Fee must be greater than 0");
		require(pegToken.balanceOf(address(this)) >= amountPegTokenReceived, "PSM: Insufficient peg token balance");
		debtToken.burn(msg.sender, amountDebtToken - fee);
		IERC20(pegToken).safeTransfer(msg.sender, amountPegTokenReceived);
		if (fee > 0) debtToken.transferFrom(msg.sender, YALA_CORE.feeReceiver(), fee);
		totalActivedebt = totalActivedebt - amountDebtToken;

		emit Sell(msg.sender, amountDebtToken, amountPegTokenReceived, fee);
	}

	function estimateBuy(uint256 amountPegToken) public view override returns (uint256 amountDebtTokenReceived, uint256 fee) {
		if (feeIn > 0) {
			fee = (amountPegToken * feeIn * priceFactor) / DECIMAL_PRECISIONS;
		}
		amountDebtTokenReceived = amountPegToken * priceFactor - fee;
	}

	function estimateSell(uint256 amountDebtToken) public view override returns (uint256 amountPegTokenReceived, uint256 fee) {
		if (feeOut > 0) {
			fee = (amountDebtToken * feeOut) / DECIMAL_PRECISIONS;
		}
		amountPegTokenReceived = (amountDebtToken - fee) / priceFactor;
	}

	function _setFeeIn(uint256 _feeIn) internal {
		require(_feeIn <= DECIMAL_PRECISIONS, "PSM: Fee in must be less than 1");
		feeIn = _feeIn;
		emit FeeInUpdated(_feeIn);
	}

	function _setFeeOut(uint256 _feeOut) internal {
		require(_feeOut <= DECIMAL_PRECISIONS, "PSM: Fee out must be less than 1");
		feeOut = _feeOut;
		emit FeeOutUpdated(_feeOut);
	}

	function _setSupplyCap(uint256 _supplyCap) internal {
		supplyCap = _supplyCap;
		emit SupplyCapUpdated(_supplyCap);
	}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

import "../interfaces/IYalaCore.sol";

/**
    @title Yala Ownable
    @notice Contracts inheriting `YalaOwnable` have the same owner as `YalaCore`.
            The ownership cannot be independently modified or renounced.
 */
contract YalaOwnable {
	IYalaCore public immutable YALA_CORE;

	constructor(address _yalaCore) {
		YALA_CORE = IYalaCore(_yalaCore);
	}

	modifier onlyOwner() {
		require(msg.sender == YALA_CORE.owner(), "Only owner");
		_;
	}

	function owner() public view returns (address) {
		return YALA_CORE.owner();
	}

	function guardian() public view returns (address) {
		return YALA_CORE.guardian();
	}
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

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

interface IDebtToken is IERC20 {
	function burn(address _account, uint256 _amount) external;
	function burnWithGasCompensation(address _account, uint256 _amount) external returns (bool);

	function enableTroveManager(address _troveManager) external;

	function enablePSM(address _psm) external;

	function mint(address _account, uint256 _amount) external;

	function mintWithGasCompensation(address _account, uint256 _amount) external returns (bool);

	function returnFromPool(address _poolAddress, address _receiver, uint256 _amount) external;

	function sendToSP(address _sender, uint256 _amount) external;

	function DEBT_GAS_COMPENSATION() external view returns (uint256);

	function borrowerOperationsAddress() external view returns (address);

	function factory() external view returns (address);

	function gasPool() external view returns (address);

	function troveManager(address) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

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

interface IMetadataNFT {
	struct TroveData {
		uint256 tokenId;
		address owner;
		IERC20 collToken;
		IERC20 debtToken;
		uint256 collAmount;
		uint256 debtAmount;
		uint256 interest;
	}

	function uri(TroveData memory _troveData) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IPriceFeed {
	event NewOracleRegistered(address token, address chainlinkAggregator, bool isEthIndexed);
	event PriceFeedStatusUpdated(address token, address oracle, bool isWorking);
	event PriceRecordUpdated(address indexed token, uint256 _price);

	function fetchPrice(address _token) external returns (uint256);

	function setOracle(address _token, address _chainlinkOracle, bytes4 sharePriceSignature, uint8 sharePriceDecimals, bool _isEthIndexed) external;

	function MAX_PRICE_DEVIATION_FROM_PREVIOUS_ROUND() external view returns (uint256);

	function YALA_CORE() external view returns (address);

	function RESPONSE_TIMEOUT() external view returns (uint256);

	function TARGET_DIGITS() external view returns (uint256);

	function guardian() external view returns (address);

	function oracleRecords(address) external view returns (address chainLinkOracle, uint8 decimals, bytes4 sharePriceSignature, uint8 sharePriceDecimals, bool isFeedWorking, bool isEthIndexed);

	function owner() external view returns (address);

	function priceRecords(address) external view returns (uint96 scaledPrice, uint32 timestamp, uint32 lastUpdated, uint80 roundId);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.28;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "./IDebtToken.sol";

interface IPSM {
	event PegTokenUpdated(IERC20Metadata pegToken);
	event FeeInUpdated(uint256 feeIn);
	event FeeOutUpdated(uint256 feeOut);
	event Buy(address from, uint256 amountDebtToken, uint256 amountPegToken, uint256 fee);
	event Sell(address from, uint256 amountDebtToken, uint256 amountPegToken, uint256 fee);
	event SupplyCapUpdated(uint256 newCap);
	event DebtCeilingUpdated(uint256 newCeiling);

	function factory() external view returns (address);
	function pegToken() external view returns (IERC20Metadata);
	function debtToken() external view returns (IDebtToken);
	function feeIn() external view returns (uint256);
	function feeOut() external view returns (uint256);
	function priceFactor() external view returns (uint256);
	function initialize(IERC20Metadata _pegToken, uint256 _feeIn, uint256 _feeOut, uint256 _supplyCap) external; // only called by owner
	function setFeeIn(uint256 _feeIn) external;
	function setFeeOut(uint256 _feeOut) external;

	function buy(uint256 amountPegToken) external returns (uint256 amountDebtTokenUsed, uint256 fee);
	function sell(uint256 amountDebtToken) external returns (uint256 amountPegTokenReceived, uint256 fee);
	function estimateBuy(uint256 amountDebtToken) external view returns (uint256 amountPegTokenUsed, uint256 fee);
	function estimateSell(uint256 amountDebtToken) external returns (uint256 amountPegTokenReceived, uint256 fee);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import "./IPriceFeed.sol";
import "./IMetadataNFT.sol";

interface ITroveManager is IERC721Enumerable {
	// Store the necessary data for a trove
	struct Trove {
		uint256 debt;
		uint256 coll;
		uint256 stake;
		uint256 interest;
	}

	struct LocalTroveUpdateVariables {
		uint256 id;
		uint256 debtChange;
		uint256 collChange;
		uint256 interestRepayment;
		bool isCollIncrease;
		bool isDebtIncrease;
		address receiver;
	}

	struct DeploymentParams {
		uint256 interestRate; // 1e16 (1%)
		uint256 maxDebt;
		uint256 spYieldPCT;
		uint256 liquidationPenaltySP;
		uint256 liquidationPenaltyRedistribution;
		uint256 maxCollGasCompensation;
		uint256 MCR; // 11e17  (110%)
		uint256 SCR;
		uint256 CCR;
		IMetadataNFT metadataNFT;
	}

	// Object containing the collateral and debt snapshots for a given active trove
	struct RewardSnapshot {
		uint256 collateral;
		uint256 debt;
		uint256 activeInterest;
		uint256 defaultedInterest;
	}

	struct LiquidationValues {
		uint256 collOffset;
		uint256 debtOffset;
		uint256 interestOffset;
		uint256 collRedist;
		uint256 debtRedist;
		uint256 interestRedist;
		uint256 debtGasCompensation;
		uint256 collGasCompensation;
		uint256 remainingDeposits;
		uint256 collSurplus;
	}

	struct SingleLiquidation {
		uint256 coll;
		uint256 debt;
		uint256 interest;
		uint256 collGasCompensation;
		uint256 debtGasCompensation;
		uint256 collToLiquidate;
		uint256 collOffset;
		uint256 debtOffset;
		uint256 interestOffset;
		uint256 collRedist;
		uint256 debtRedist;
		uint256 interestRedist;
		uint256 collSurplus;
	}

	enum TroveManagerOperation {
		open,
		close,
		adjust,
		liquidate
	}
	event CRUpdated(uint256 _MCR, uint256 _SCR, uint256 _CCR);
	event ShutDown();
	event PauseUpdated(bool _paused);
	event PriceFeedUpdated(IPriceFeed priceFeed);
	event MetadataNFTUpdated(IMetadataNFT _metadataNFT);
	event InterestRateUpdated(uint256 _interestRate);
	event MaxSystemDebtUpdated(uint256 _cap);
	event SPYieldPCTUpdated(uint256 _spYielPCT);
	event LIQUIDATION_PENALTY_SP_Updated(uint256 _penaltySP);
	event LIQUIDATION_PENALTY_REDISTRIBUTION_Updated(uint256 _penaltyRedist);
	event MAX_COLL_GAS_COMPENSATION_Updated(uint256 _maxCollGasCompensation);

	event TroveOpened(uint256 id, address owner, uint256 _collateralAmount, uint256 _compositeDebt, uint256 stake);
	event TroveUpdated(uint256 id, uint256 newColl, uint256 newDebt, uint256 newStake, uint256 newInterest, address _receiver, TroveManagerOperation operation);
	event TotalStakesUpdated(uint256 newTotalStakes);
	event LTermsUpdated(uint256 new_L_collateral, uint256 new_L_debt, uint256 new_L_defaulted_interest);
	event Liquidated(address owner, uint256 id, uint256 coll, uint256 debt, uint256 interest, uint256 collSurplus);
	event CollateralSent(address _account, uint256 _amount);
	event CollSurplusClaimed(address _account, uint256 _amount);
	event TroveClosed(uint256 id);
	event InterestAccrued(uint256 interest);
	event SPYieldAccrued(uint256 yieldFee);
	function accrueInterests() external returns (uint256 yieldSP, uint256 yieldFee);
	function collateralToken() external view returns (IERC20);
	function totalActiveDebt() external view returns (uint256);
	function defaultedDebt() external view returns (uint256);
	function shutdownAt() external view returns (uint256);
	function getEntireSystemDebt() external view returns (uint256);
	function getEntireSystemBalances() external returns (uint256 coll, uint256 debt, uint256 interest, uint256 price);
	function interestRate() external view returns (uint256);
	function MCR() external view returns (uint256);
	function SCR() external view returns (uint256);
	function CCR() external view returns (uint256);
	function maxSystemDebt() external view returns (uint256);
	function SP_YIELD_PCT() external view returns (uint256);
	function MAX_COLL_GAS_COMPENSATION() external view returns (uint256);
	function LIQUIDATION_PENALTY_SP() external view returns (uint256);
	function LIQUIDATION_PENALTY_REDISTRIBUTION() external view returns (uint256);
	function getTCR() external returns (uint256);
	function setParameters(IPriceFeed _priceFeed, IERC20 _collateral, DeploymentParams memory params) external;
	function openTrove(address owner, uint256 _collateralAmount, uint256 _compositeDebt) external returns (uint256 id);
	function updateTroveFromAdjustment(uint256 id, bool _isDebtIncrease, uint256 _debtChange, bool _isCollIncrease, uint256 _collChange, uint256 _interestRepayment, address _receiver) external returns (uint256, uint256, uint256, uint256);
	function closeTrove(uint256 id, address _receiver, uint256 collAmount, uint256 debtAmount, uint256 interest) external;
	function applyPendingRewards(uint256 id) external returns (uint256 coll, uint256 debt, uint256 interest);
	function fetchPrice() external returns (uint256);
	function getCurrentTrove(uint256 id) external view returns (Trove memory);
	function getPendingYieldSP() external view returns (uint256);
	function accountCollSurplus(address account) external view returns (uint256);
	function hasShutdown() external view returns (bool);
	function batchLiquidate(uint256[] memory ids) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IYalaCore {
	event NewOwnerCommitted(address owner, address pendingOwner, uint256 deadline);

	event NewOwnerAccepted(address oldOwner, address owner);

	event NewOwnerRevoked(address owner, address revokedOwner);

	event FeeReceiverSet(address feeReceiver);

	event GuardianSet(address guardian);

	event Paused();

	event Unpaused();

	function acceptTransferOwnership() external;

	function commitTransferOwnership(address newOwner) external;

	function revokeTransferOwnership() external;

	function setFeeReceiver(address _feeReceiver) external;

	function setGuardian(address _guardian) external;

	function setPaused(bool _paused) external;

	function OWNERSHIP_TRANSFER_DELAY() external view returns (uint256);

	function feeReceiver() external view returns (address);

	function guardian() external view returns (address);

	function owner() external view returns (address);

	function ownershipTransferDeadline() external view returns (uint256);

	function paused() external view returns (bool);

	function pendingOwner() external view returns (address);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_yalaCore","type":"address"},{"internalType":"address","name":"_factory","type":"address"},{"internalType":"address","name":"_debtToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountDebtToken","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountPegToken","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"Buy","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newCeiling","type":"uint256"}],"name":"DebtCeilingUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"feeIn","type":"uint256"}],"name":"FeeInUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"feeOut","type":"uint256"}],"name":"FeeOutUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract 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