contract Curve is Storage, MerkleProver {
    using SafeMath for uint256;

    event Approval(address indexed _owner, address indexed spender, uint256 value);

    event ParametersSet(uint256 alpha, uint256 beta, uint256 delta, uint256 epsilon, uint256 lambda);

    event AssetIncluded(address indexed numeraire, address indexed reserve, uint256 weight);

    event AssimilatorIncluded(
        address indexed derivative,
        address indexed numeraire,
        address indexed reserve,
        address assimilator
    );

    event PartitionRedeemed(address indexed token, address indexed redeemer, uint256 value);

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

    event FrozenSet(bool isFrozen);

    event EmergencyAlarm(bool isEmergency);

    event WhitelistingStopped();

    event Trade(
        address indexed trader,
        address indexed origin,
        address indexed target,
        uint256 originAmount,
        uint256 targetAmount
    );

    event Transfer(address indexed from, address indexed to, uint256 value);

    modifier onlyOwner() {
        require(msg.sender == owner, "Curve/caller-is-not-owner");
        _;
    }

    modifier nonReentrant() {
        require(notEntered, "Curve/re-entered");
        notEntered = false;
        _;
        notEntered = true;
    }

    modifier transactable() {
        require(!frozen, "Curve/frozen-only-allowing-proportional-withdraw");
        _;
    }

    modifier isEmergency() {
        require(emergency, "Curve/emergency-only-allowing-emergency-proportional-withdraw");
        _;
    }

    modifier deadline(uint256 _deadline) {
        require(block.timestamp < _deadline, "Curve/tx-deadline-passed");
        _;
    }

    modifier inWhitelistingStage() {
        require(whitelistingStage, "Curve/whitelist-stage-on-going");
        _;
    }

    modifier notInWhitelistingStage() {
        require(!whitelistingStage, "Curve/whitelist-stage-stopped");
        _;
    }

    constructor(
        string memory _name,
        string memory _symbol,
        address[] memory _assets,
        uint256[] memory _assetWeights
    ) {
        owner = msg.sender;
        name = _name;
        symbol = _symbol;
        emit OwnershipTransfered(address(0), msg.sender);

        Orchestrator.initialize(curve, numeraires, reserves, derivatives, _assets, _assetWeights);
    }

    /// @notice sets the parameters for the pool
    /// @param _alpha the value for alpha (halt threshold) must be less than or equal to 1 and greater than 0
    /// @param _beta the value for beta must be less than alpha and greater than 0
    /// @param _feeAtHalt the maximum value for the fee at the halt point
    /// @param _epsilon the base fee for the pool
    /// @param _lambda the value for lambda must be less than or equal to 1 and greater than zero
    function setParams(
        uint256 _alpha,
        uint256 _beta,
        uint256 _feeAtHalt,
        uint256 _epsilon,
        uint256 _lambda
    ) external onlyOwner {
        Orchestrator.setParams(curve, _alpha, _beta, _feeAtHalt, _epsilon, _lambda);
    }

    /// @notice excludes an assimilator from the curve
    /// @param _derivative the address of the assimilator to exclude
    function excludeDerivative(address _derivative) external onlyOwner {
        for (uint256 i = 0; i < numeraires.length; i++) {
            if (_derivative == numeraires[i]) revert("Curve/cannot-delete-numeraire");
            if (_derivative == reserves[i]) revert("Curve/cannot-delete-reserve");
        }

        delete curve.assimilators[_derivative];
    }

    /// @notice view the current parameters of the curve
    /// @return alpha_ the current alpha value
    ///  beta_ the current beta value
    ///  delta_ the current delta value
    ///  epsilon_ the current epsilon value
    ///  lambda_ the current lambda value
    ///  omega_ the current omega value
    function viewCurve()
        external
        view
        returns (
            uint256 alpha_,
            uint256 beta_,
            uint256 delta_,
            uint256 epsilon_,
            uint256 lambda_
        )
    {
        return Orchestrator.viewCurve(curve);
    }

    function turnOffWhitelisting() external onlyOwner {
        emit WhitelistingStopped();

        whitelistingStage = false;
    }

    function setEmergency(bool _emergency) external onlyOwner {
        emit EmergencyAlarm(_emergency);

        emergency = _emergency;
    }

    function setFrozen(bool _toFreezeOrNotToFreeze) external onlyOwner {
        emit FrozenSet(_toFreezeOrNotToFreeze);

        frozen = _toFreezeOrNotToFreeze;
    }

    function transferOwnership(address _newOwner) external onlyOwner {
        require(_newOwner != address(0), "Curve/new-owner-cannot-be-zeroth-address");

        emit OwnershipTransfered(owner, _newOwner);

        owner = _newOwner;
    }

    /// @notice swap a dynamic origin amount for a fixed target amount
    /// @param _origin the address of the origin
    /// @param _target the address of the target
    /// @param _originAmount the origin amount
    /// @param _minTargetAmount the minimum target amount
    /// @param _deadline deadline in block number after which the trade will not execute
    /// @return targetAmount_ the amount of target that has been swapped for the origin amount
    function originSwap(
        address _origin,
        address _target,
        uint256 _originAmount,
        uint256 _minTargetAmount,
        uint256 _deadline
    ) external deadline(_deadline) transactable nonReentrant returns (uint256 targetAmount_) {
        targetAmount_ = Swaps.originSwap(curve, _origin, _target, _originAmount, msg.sender);

        require(targetAmount_ >= _minTargetAmount, "Curve/below-min-target-amount");
    }

    /// @notice view how much target amount a fixed origin amount will swap for
    /// @param _origin the address of the origin
    /// @param _target the address of the target
    /// @param _originAmount the origin amount
    /// @return targetAmount_ the target amount that would have been swapped for the origin amount
    function viewOriginSwap(
        address _origin,
        address _target,
        uint256 _originAmount
    ) external view transactable returns (uint256 targetAmount_) {
        targetAmount_ = Swaps.viewOriginSwap(curve, _origin, _target, _originAmount);
    }

    /// @notice swap a dynamic origin amount for a fixed target amount
    /// @param _origin the address of the origin
    /// @param _target the address of the target
    /// @param _maxOriginAmount the maximum origin amount
    /// @param _targetAmount the target amount
    /// @param _deadline deadline in block number after which the trade will not execute
    /// @return originAmount_ the amount of origin that has been swapped for the target
    function targetSwap(
        address _origin,
        address _target,
        uint256 _maxOriginAmount,
        uint256 _targetAmount,
        uint256 _deadline
    ) external deadline(_deadline) transactable nonReentrant returns (uint256 originAmount_) {
        originAmount_ = Swaps.targetSwap(curve, _origin, _target, _targetAmount, msg.sender);

        require(originAmount_ <= _maxOriginAmount, "Curve/above-max-origin-amount");
    }

    /// @notice view how much of the origin currency the target currency will take
    /// @param _origin the address of the origin
    /// @param _target the address of the target
    /// @param _targetAmount the target amount
    /// @return originAmount_ the amount of target that has been swapped for the origin
    function viewTargetSwap(
        address _origin,
        address _target,
        uint256 _targetAmount
    ) external view transactable returns (uint256 originAmount_) {
        originAmount_ = Swaps.viewTargetSwap(curve, _origin, _target, _targetAmount);
    }

    /// @notice deposit into the pool with no slippage from the numeraire assets the pool supports
    /// @param  index Index corresponding to the merkleProof
    /// @param  account Address coorresponding to the merkleProof
    /// @param  amount Amount coorresponding to the merkleProof, should always be 1
    /// @param  merkleProof Merkle proof
    /// @param  _deposit the full amount you want to deposit into the pool which will be divided up evenly amongst
    ///                  the numeraire assets of the pool
    /// @return (the amount of curves you receive in return for your deposit,
    ///          the amount deposited for each numeraire)
    function depositWithWhitelist(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 _deposit,
        uint256 _deadline
    ) external deadline(_deadline) transactable nonReentrant inWhitelistingStage returns (uint256, uint256[] memory) {
        require(isWhitelisted(index, account, amount, merkleProof), "Curve/not-whitelisted");
        require(msg.sender == account, "Curve/not-approved-user");

        (uint256 curvesMinted_, uint256[] memory deposits_) =
            ProportionalLiquidity.proportionalDeposit(curve, _deposit);

        whitelistedDeposited[msg.sender] = whitelistedDeposited[msg.sender].add(curvesMinted_);

        // 10k max deposit
        if (whitelistedDeposited[msg.sender] > 10000e18) {
            revert("Curve/exceed-whitelist-maximum-deposit");
        }

        return (curvesMinted_, deposits_);
    }

    /// @notice deposit into the pool with no slippage from the numeraire assets the pool supports
    /// @param  _deposit the full amount you want to deposit into the pool which will be divided up evenly amongst
    ///                  the numeraire assets of the pool
    /// @return (the amount of curves you receive in return for your deposit,
    ///          the amount deposited for each numeraire)
    function deposit(uint256 _deposit, uint256 _deadline)
        external
        deadline(_deadline)
        transactable
        nonReentrant
        notInWhitelistingStage
        returns (uint256, uint256[] memory)
    {
        // (curvesMinted_,  deposits_)
        return ProportionalLiquidity.proportionalDeposit(curve, _deposit);
    }

    /// @notice view deposits and curves minted a given deposit would return
    /// @param _deposit the full amount of stablecoins you want to deposit. Divided evenly according to the
    ///                 prevailing proportions of the numeraire assets of the pool
    /// @return (the amount of curves you receive in return for your deposit,
    ///          the amount deposited for each numeraire)
    function viewDeposit(uint256 _deposit) external view transactable returns (uint256, uint256[] memory) {
        // curvesToMint_, depositsToMake_
        return ProportionalLiquidity.viewProportionalDeposit(curve, _deposit);
    }

    /// @notice  Emergency withdraw tokens in the event that the oracle somehow bugs out
    ///          and no one is able to withdraw due to the invariant check
    /// @param   _curvesToBurn the full amount you want to withdraw from the pool which will be withdrawn from evenly amongst the
    ///                        numeraire assets of the pool
    /// @return withdrawals_ the amonts of numeraire assets withdrawn from the pool
    function emergencyWithdraw(uint256 _curvesToBurn, uint256 _deadline)
        external
        isEmergency
        deadline(_deadline)
        nonReentrant
        returns (uint256[] memory withdrawals_)
    {
        return ProportionalLiquidity.emergencyProportionalWithdraw(curve, _curvesToBurn);
    }

    /// @notice  withdrawas amount of curve tokens from the the pool equally from the numeraire assets of the pool with no slippage
    /// @param   _curvesToBurn the full amount you want to withdraw from the pool which will be withdrawn from evenly amongst the
    ///                        numeraire assets of the pool
    /// @return withdrawals_ the amonts of numeraire assets withdrawn from the pool
    function withdraw(uint256 _curvesToBurn, uint256 _deadline)
        external
        deadline(_deadline)
        nonReentrant
        returns (uint256[] memory withdrawals_)
    {
        if (whitelistingStage) {
            whitelistedDeposited[msg.sender] = whitelistedDeposited[msg.sender].sub(_curvesToBurn);
        }

        return ProportionalLiquidity.proportionalWithdraw(curve, _curvesToBurn);
    }

    /// @notice  views the withdrawal information from the pool
    /// @param   _curvesToBurn the full amount you want to withdraw from the pool which will be withdrawn from evenly amongst the
    ///                        numeraire assets of the pool
    /// @return the amonnts of numeraire assets withdrawn from the pool
    function viewWithdraw(uint256 _curvesToBurn) external view transactable returns (uint256[] memory) {
        return ProportionalLiquidity.viewProportionalWithdraw(curve, _curvesToBurn);
    }

    function supportsInterface(bytes4 _interface) public pure returns (bool supports_) {
        supports_ =
            this.supportsInterface.selector == _interface || // erc165
            bytes4(0x7f5828d0) == _interface || // eip173
            bytes4(0x36372b07) == _interface; // erc20
    }

    /// @notice transfers curve tokens
    /// @param _recipient the address of where to send the curve tokens
    /// @param _amount the amount of curve tokens to send
    /// @return success_ the success bool of the call
    function transfer(address _recipient, uint256 _amount) public nonReentrant returns (bool success_) {
        success_ = Curves.transfer(curve, _recipient, _amount);
    }

    /// @notice transfers curve tokens from one address to another address
    /// @param _sender the account from which the curve tokens will be sent
    /// @param _recipient the account to which the curve tokens will be sent
    /// @param _amount the amount of curve tokens to transfer
    /// @return success_ the success bool of the call
    function transferFrom(
        address _sender,
        address _recipient,
        uint256 _amount
    ) public nonReentrant returns (bool success_) {
        success_ = Curves.transferFrom(curve, _sender, _recipient, _amount);
    }

    /// @notice approves a user to spend curve tokens on their behalf
    /// @param _spender the account to allow to spend from msg.sender
    /// @param _amount the amount to specify the spender can spend
    /// @return success_ the success bool of this call
    function approve(address _spender, uint256 _amount) public nonReentrant returns (bool success_) {
        success_ = Curves.approve(curve, _spender, _amount);
    }

    /// @notice view the curve token balance of a given account
    /// @param _account the account to view the balance of
    /// @return balance_ the curve token ballance of the given account
    function balanceOf(address _account) public view returns (uint256 balance_) {
        balance_ = curve.balances[_account];
    }

    /// @notice views the total curve supply of the pool
    /// @return totalSupply_ the total supply of curve tokens
    function totalSupply() public view returns (uint256 totalSupply_) {
        totalSupply_ = curve.totalSupply;
    }

    /// @notice views the total allowance one address has to spend from another address
    /// @param _owner the address of the owner
    /// @param _spender the address of the spender
    /// @return allowance_ the amount the owner has allotted the spender
    function allowance(address _owner, address _spender) public view returns (uint256 allowance_) {
        allowance_ = curve.allowances[_owner][_spender];
    }

    /// @notice views the total amount of liquidity in the curve in numeraire value and format - 18 decimals
    /// @return total_ the total value in the curve
    /// @return individual_ the individual values in the curve
    function liquidity() public view returns (uint256 total_, uint256[] memory individual_) {
        return ViewLiquidity.viewLiquidity(curve);
    }

    /// @notice view the assimilator address for a derivative
    /// @return assimilator_ the assimilator address
    function assimilator(address _derivative) public view returns (address assimilator_) {
        assimilator_ = curve.assimilators[_derivative].addr;
    }
}
function viewWithdraw(uint256 _curvesToBurn) external view transactable returns (uint256[] memory) {
    return ProportionalLiquidity.viewProportionalWithdraw(curve, _curvesToBurn);
}

/// @notice  views the withdrawal information from the pool
/// @param   _curvesToBurn the full amount you want to withdraw from the pool which will be withdrawn from evenly amongst the
///                        numeraire assets of the pool
/// @return the amonnts of numeraire assets withdrawn from the pool