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// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

import {FixedPointMathLib} from "solmate/utils/FixedPointMathLib.sol";

import {ICurve} from "./ICurve.sol";
import {CurveErrorCodes} from "./CurveErrorCodes.sol";

/**
 * @author 0xacedia
 * @notice Bonding curve logic for an x*y=k curve using virtual reserves.
 * @dev The virtual token reserve is stored in `spotPrice` and the virtual nft reserve is stored in `delta`.
 * An LP can modify the virtual reserves by changing the `spotPrice` (tokens) or `delta` (nfts).
 */
contract XykCurve is ICurve, CurveErrorCodes {
    using FixedPointMathLib for uint256;

    /**
     * @dev See {ICurve-validateDelta}
     */
    function validateDelta(uint128 /*delta*/ ) external pure override returns (bool) {
        // all values are valid
        return true;
    }

    /**
     * @dev See {ICurve-validateSpotPrice}
     */
    function validateSpotPrice(uint128 /*newSpotPrice*/ ) external pure override returns (bool) {
        // all values are valid
        return true;
    }

    /**
     * @dev See {ICurve-getBuyInfo}
     */
    function getBuyInfo(
        uint128 spotPrice,
        uint128 delta,
        uint256 numItems,
        uint256 feeMultiplier,
        uint256 protocolFeeMultiplier
    )
        external
        pure
        override
        returns (
            Error error,
            uint128 newSpotPrice,
            uint128 newDelta,
            uint256 inputValue,
            uint256 tradeFee,
            uint256 protocolFee
        )
    {
        if (numItems == 0) {
            return (Error.INVALID_NUMITEMS, 0, 0, 0, 0, 0);
        }

        // Get the pair's virtual nft and token reserves
        uint256 nftBalance = delta;

        // If numItems is too large, we will get a divide by zero error
        if (numItems >= nftBalance) {
            return (Error.INVALID_NUMITEMS, 0, 0, 0, 0, 0);
        }

        // Calculate new nft balance
        uint256 newNftBalance;
        unchecked {
            newNftBalance = nftBalance - numItems;
        }

        // Calculate the amount to send in. spotPrice is the virtual reserve.
        uint256 inputValueWithoutFee = (numItems * spotPrice) / newNftBalance;

        // Add the fees to the amount to send in
        protocolFee = inputValueWithoutFee.mulWadUp(protocolFeeMultiplier);
        tradeFee = inputValueWithoutFee.mulWadUp(feeMultiplier);
        inputValue = inputValueWithoutFee + tradeFee + protocolFee;

        // Set the new virtual reserves
        uint256 newSpotPrice_ = spotPrice + inputValueWithoutFee;
        if (newSpotPrice_ > type(uint128).max) {
            return (Error.SPOT_PRICE_OVERFLOW, 0, 0, 0, 0, 0);
        }

        newSpotPrice = uint128(newSpotPrice_); // token reserve

        newDelta = uint128(newNftBalance); // nft reserve

        // If we got all the way here, no math errors happened
        error = Error.OK;
    }

    /**
     * @dev See {ICurve-getSellInfo}
     */
    function getSellInfo(
        uint128 spotPrice,
        uint128 delta,
        uint256 numItems,
        uint256 feeMultiplier,
        uint256 protocolFeeMultiplier
    )
        external
        pure
        override
        returns (
            Error error,
            uint128 newSpotPrice,
            uint128 newDelta,
            uint256 outputValue,
            uint256 tradeFee,
            uint256 protocolFee
        )
    {
        if (numItems == 0) {
            return (Error.INVALID_NUMITEMS, 0, 0, 0, 0, 0);
        }

        // Get the pair's virtual nft and eth/erc20 balance
        uint256 tokenBalance = spotPrice;
        uint256 nftBalance = delta;

        // Return early if new nft balance is too high
        uint256 newBalance = nftBalance + numItems;
        if (newBalance > type(uint128).max) {
            return (Error.DELTA_OVERFLOW, 0, 0, 0, 0, 0);
        }

        // Calculate the amount to send out
        uint256 outputValueWithoutFee = (numItems * tokenBalance) / newBalance;

        // Subtract fees from amount to send out
        protocolFee = outputValueWithoutFee.mulWadUp(protocolFeeMultiplier);
        tradeFee = outputValueWithoutFee.mulWadUp(feeMultiplier);
        outputValue = outputValueWithoutFee - tradeFee - protocolFee;

        // Set new nft balance
        newDelta = uint128(newBalance);

        // Set the new virtual reserves
        newSpotPrice = uint128(spotPrice - outputValueWithoutFee); // token reserve

        // If we got all the way here, no math errors happened
        error = Error.OK;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Arithmetic library with operations for fixed-point numbers.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol)
/// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol)
library FixedPointMathLib {
    /*//////////////////////////////////////////////////////////////
                    SIMPLIFIED FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    uint256 internal constant MAX_UINT256 = 2**256 - 1;

    uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up.
    }

    function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down.
    }

    function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up.
    }

    /*//////////////////////////////////////////////////////////////
                    LOW LEVEL FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function mulDivDown(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // Divide x * y by the denominator.
            z := div(mul(x, y), denominator)
        }
    }

    function mulDivUp(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // If x * y modulo the denominator is strictly greater than 0,
            // 1 is added to round up the division of x * y by the denominator.
            z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator))
        }
    }

    function rpow(
        uint256 x,
        uint256 n,
        uint256 scalar
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    // 0 ** 0 = 1
                    z := scalar
                }
                default {
                    // 0 ** n = 0
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    // If n is even, store scalar in z for now.
                    z := scalar
                }
                default {
                    // If n is odd, store x in z for now.
                    z := x
                }

                // Shifting right by 1 is like dividing by 2.
                let half := shr(1, scalar)

                for {
                    // Shift n right by 1 before looping to halve it.
                    n := shr(1, n)
                } n {
                    // Shift n right by 1 each iteration to halve it.
                    n := shr(1, n)
                } {
                    // Revert immediately if x ** 2 would overflow.
                    // Equivalent to iszero(eq(div(xx, x), x)) here.
                    if shr(128, x) {
                        revert(0, 0)
                    }

                    // Store x squared.
                    let xx := mul(x, x)

                    // Round to the nearest number.
                    let xxRound := add(xx, half)

                    // Revert if xx + half overflowed.
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }

                    // Set x to scaled xxRound.
                    x := div(xxRound, scalar)

                    // If n is even:
                    if mod(n, 2) {
                        // Compute z * x.
                        let zx := mul(z, x)

                        // If z * x overflowed:
                        if iszero(eq(div(zx, x), z)) {
                            // Revert if x is non-zero.
                            if iszero(iszero(x)) {
                                revert(0, 0)
                            }
                        }

                        // Round to the nearest number.
                        let zxRound := add(zx, half)

                        // Revert if zx + half overflowed.
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }

                        // Return properly scaled zxRound.
                        z := div(zxRound, scalar)
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                        GENERAL NUMBER UTILITIES
    //////////////////////////////////////////////////////////////*/

    function sqrt(uint256 x) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            let y := x // We start y at x, which will help us make our initial estimate.

            z := 181 // The "correct" value is 1, but this saves a multiplication later.

            // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad
            // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically.

            // We check y >= 2^(k + 8) but shift right by k bits
            // each branch to ensure that if x >= 256, then y >= 256.
            if iszero(lt(y, 0x10000000000000000000000000000000000)) {
                y := shr(128, y)
                z := shl(64, z)
            }
            if iszero(lt(y, 0x1000000000000000000)) {
                y := shr(64, y)
                z := shl(32, z)
            }
            if iszero(lt(y, 0x10000000000)) {
                y := shr(32, y)
                z := shl(16, z)
            }
            if iszero(lt(y, 0x1000000)) {
                y := shr(16, y)
                z := shl(8, z)
            }

            // Goal was to get z*z*y within a small factor of x. More iterations could
            // get y in a tighter range. Currently, we will have y in [256, 256*2^16).
            // We ensured y >= 256 so that the relative difference between y and y+1 is small.
            // That's not possible if x < 256 but we can just verify those cases exhaustively.

            // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256.
            // Correctness can be checked exhaustively for x < 256, so we assume y >= 256.
            // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps.

            // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range
            // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256.

            // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate
            // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18.

            // There is no overflow risk here since y < 2^136 after the first branch above.
            z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181.

            // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough.
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))

            // If x+1 is a perfect square, the Babylonian method cycles between
            // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor.
            // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division
            // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case.
            // If you don't care whether the floor or ceil square root is returned, you can remove this statement.
            z := sub(z, lt(div(x, z), z))
        }
    }

    function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Mod x by y. Note this will return
            // 0 instead of reverting if y is zero.
            z := mod(x, y)
        }
    }

    function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) {
        /// @solidity memory-safe-assembly
        assembly {
            // Divide x by y. Note this will return
            // 0 instead of reverting if y is zero.
            r := div(x, y)
        }
    }

    function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Add 1 to x * y if x % y > 0. Note this will
            // return 0 instead of reverting if y is zero.
            z := add(gt(mod(x, y), 0), div(x, y))
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

import {CurveErrorCodes} from "./CurveErrorCodes.sol";

interface ICurve {
    /**
     * @notice Validates if a delta value is valid for the curve. The criteria for
     * validity can be different for each type of curve, for instance ExponentialCurve
     * requires delta to be greater than 1.
     * @param delta The delta value to be validated
     * @return valid True if delta is valid, false otherwise
     */
    function validateDelta(uint128 delta) external pure returns (bool valid);

    /**
     * @notice Validates if a new spot price is valid for the curve. Spot price is generally assumed to be the immediate sell price of 1 NFT to the pool, in units of the pool's paired token.
     * @param newSpotPrice The new spot price to be set
     * @return valid True if the new spot price is valid, false otherwise
     */
    function validateSpotPrice(uint128 newSpotPrice) external view returns (bool valid);

    /**
     * @notice Given the current state of the pair and the trade, computes how much the user
     * should pay to purchase an NFT from the pair, the new spot price, and other values.
     * @param spotPrice The current selling spot price of the pair, in tokens
     * @param delta The delta parameter of the pair, what it means depends on the curve
     * @param numItems The number of NFTs the user is buying from the pair
     * @param feeMultiplier Determines how much fee the LP takes from this trade, 18 decimals
     * @param protocolFeeMultiplier Determines how much fee the protocol takes from this trade, 18 decimals
     * @return error Any math calculation errors, only Error.OK means the returned values are valid
     * @return newSpotPrice The updated selling spot price, in tokens
     * @return newDelta The updated delta, used to parameterize the bonding curve
     * @return inputValue The amount that the user should pay, in tokens
     * @return tradeFee The amount that is sent to the trade fee recipient
     * @return protocolFee The amount of fee to send to the protocol, in tokens
     */
    function getBuyInfo(
        uint128 spotPrice,
        uint128 delta,
        uint256 numItems,
        uint256 feeMultiplier,
        uint256 protocolFeeMultiplier
    )
        external
        view
        returns (
            CurveErrorCodes.Error error,
            uint128 newSpotPrice,
            uint128 newDelta,
            uint256 inputValue,
            uint256 tradeFee,
            uint256 protocolFee
        );

    /**
     * @notice Given the current state of the pair and the trade, computes how much the user
     * should receive when selling NFTs to the pair, the new spot price, and other values.
     * @param spotPrice The current selling spot price of the pair, in tokens
     * @param delta The delta parameter of the pair, what it means depends on the curve
     * @param numItems The number of NFTs the user is selling to the pair
     * @param feeMultiplier Determines how much fee the LP takes from this trade, 18 decimals
     * @param protocolFeeMultiplier Determines how much fee the protocol takes from this trade, 18 decimals
     * @return error Any math calculation errors, only Error.OK means the returned values are valid
     * @return newSpotPrice The updated selling spot price, in tokens
     * @return newDelta The updated delta, used to parameterize the bonding curve
     * @return outputValue The amount that the user should receive, in tokens
     * @return tradeFee The amount that is sent to the trade fee recipient
     * @return protocolFee The amount of fee to send to the protocol, in tokens
     */
    function getSellInfo(
        uint128 spotPrice,
        uint128 delta,
        uint256 numItems,
        uint256 feeMultiplier,
        uint256 protocolFeeMultiplier
    )
        external
        view
        returns (
            CurveErrorCodes.Error error,
            uint128 newSpotPrice,
            uint128 newDelta,
            uint256 outputValue,
            uint256 tradeFee,
            uint256 protocolFee
        );
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

contract CurveErrorCodes {
    enum Error {
        OK, // No error
        INVALID_NUMITEMS, // The numItem value is 0
        SPOT_PRICE_OVERFLOW, // The updated spot price doesn't fit into 128 bits
        DELTA_OVERFLOW, // The updated delta doesn't fit into 128 bits
        SPOT_PRICE_UNDERFLOW // The updated spot price goes too low
    }
}

{
  "remappings": [
    "@manifoldxyz/=lib/",
    "manifoldxyz/=lib/royalty-registry-solidity/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "create3-factory/=lib/create3-factory/src/",
    "solmate/=lib/solmate/src/",
    "@prb/math/=lib/prb-math/src/",
    "clones-with-immutable-args/=lib/clones-with-immutable-args/src/",
    "ds-test/=lib/clones-with-immutable-args/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "solady/=lib/solady/src/",
    "nitro-contracts/=lib/nitro-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

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[{"inputs":[{"internalType":"uint128","name":"spotPrice","type":"uint128"},{"internalType":"uint128","name":"delta","type":"uint128"},{"internalType":"uint256","name":"numItems","type":"uint256"},{"internalType":"uint256","name":"feeMultiplier","type":"uint256"},{"internalType":"uint256","name":"protocolFeeMultiplier","type":"uint256"}],"name":"getBuyInfo","outputs":[{"internalType":"enum CurveErrorCodes.Error","name":"error","type":"uint8"},{"internalType":"uint128","name":"newSpotPrice","type":"uint128"},{"internalType":"uint128","name":"newDelta","type":"uint128"},{"internalType":"uint256","name":"inputValue","type":"uint256"},{"internalType":"uint256","name":"tradeFee","type":"uint256"},{"internalType":"uint256","name":"protocolFee","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint128","name":"spotPrice","type":"uint128"},{"internalType":"uint128","name":"delta","type":"uint128"},{"internalType":"uint256","name":"numItems","type":"uint256"},{"internalType":"uint256","name":"feeMultiplier","type":"uint256"},{"internalType":"uint256","name":"protocolFeeMultiplier","type":"uint256"}],"name":"getSellInfo","outputs":[{"internalType":"enum CurveErrorCodes.Error","name":"error","type":"uint8"},{"internalType":"uint128","name":"newSpotPrice","type":"uint128"},{"internalType":"uint128","name":"newDelta","type":"uint128"},{"internalType":"uint256","name":"outputValue","type":"uint256"},{"internalType":"uint256","name":"tradeFee","type":"uint256"},{"internalType":"uint256","name":"protocolFee","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint128","name":"","type":"uint128"}],"name":"validateDelta","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint128","name":"","type":"uint128"}],"name":"validateSpotPrice","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

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