IPartyPoolViewer

src/IPartyPoolViewer.sol

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.30;
+
+import {IPartyPool} from "./IPartyPool.sol";
+
+interface IPartyPoolViewer {
+    /// @notice Marginal price of `base` denominated in `quote` as Q64.64.
+    /// @dev Returns the LMSR marginal price p_quote / p_base in ABDK 64.64 fixed-point format.
+    ///      Useful for off-chain quoting; raw 64.64 value is returned (no scaling to token units).
+    /// @param baseTokenIndex index of the base asset (e.g., ETH)
+    /// @param quoteTokenIndex index of the quote asset (e.g., USD)
+    /// @return price Q64.64 value equal to quote per base (p_quote / p_base)
+    function price(IPartyPool pool, uint256 baseTokenIndex, uint256 quoteTokenIndex) external view returns (int128);
+
+    /// @notice Price of one LP token denominated in `quote` as Q64.64.
+    /// @dev Computes LMSR poolPrice (quote per unit internal qTotal) and scales it to LP units:
+    ///      returns price_per_LP = poolPrice_quote * (totalSupply() / qTotal) in ABDK 64.64 format.
+    ///      The returned value is raw Q64.64 and represents quote units per one LP token unit.
+    /// @param quoteTokenIndex index of the quote asset in which to denominate the LP price
+    /// @return price Q64.64 value equal to quote per LP token unit
+    function poolPrice(IPartyPool pool, uint256 quoteTokenIndex) external view returns (int128);
+
+    /// @notice Calculate the proportional deposit amounts required for a given LP token amount
+    /// @dev Returns the minimum token amounts (rounded up) that must be supplied to receive lpTokenAmount
+    ///      LP tokens at current pool proportions. If the pool is empty (initial deposit) returns zeros
+    ///      because the initial deposit is handled by transferring tokens then calling mint().
+    /// @param lpTokenAmount The amount of LP tokens desired
+    /// @return depositAmounts Array of token amounts to deposit (rounded up)
+    function mintAmounts(IPartyPool pool, uint256 lpTokenAmount) external view returns (uint256[] memory depositAmounts);
+
+    function burnAmounts(IPartyPool pool, uint256 lpTokenAmount) external view returns (uint256[] memory withdrawAmounts);
+
+    /// @notice External view to quote swap-to-limit amounts (gross input incl. fee and output), matching swapToLimit() computations
+    /// @param inputTokenIndex index of input token
+    /// @param outputTokenIndex index of output token
+    /// @param limitPrice target marginal price to reach (must be > 0)
+    /// @return amountIn gross input amount to transfer (includes fee), amountOut output amount user would receive, fee fee amount taken
+    function swapToLimitAmounts(
+        IPartyPool pool,
+        uint256 inputTokenIndex,
+        uint256 outputTokenIndex,
+        int128 limitPrice
+    ) external view returns (uint256 amountIn, uint256 amountOut, uint256 fee);
+
+    /// @notice Calculate the amounts for a swap mint operation
+    /// @dev This is a pure view function that computes swap mint amounts from provided state
+    /// @param inputTokenIndex index of the input token
+    /// @param maxAmountIn maximum amount of token to deposit (inclusive of fee)
+    function swapMintAmounts(IPartyPool pool, uint256 inputTokenIndex, uint256 maxAmountIn) external view
+        returns (uint256 amountInUsed, uint256 fee, uint256 lpMinted);
+
+    /// @notice Calculate the amounts for a burn swap operation
+    /// @dev This is a pure view function that computes burn swap amounts from provided state
+    /// @param lpAmount amount of LP tokens to burn
+    /// @param inputTokenIndex index of target asset to receive
+    function burnSwapAmounts(IPartyPool pool, uint256 lpAmount, uint256 inputTokenIndex) external view
+        returns (uint256 amountOut);
+
+    /// @notice Compute repayment amounts (principal + flash fee) for a proposed flash loan.
+    /// @param loanAmounts array of per-token loan amounts; must match the pool's token ordering.
+    /// @return repaymentAmounts array where repaymentAmounts[i] = loanAmounts[i] + ceil(loanAmounts[i] * flashFeePpm)
+    function flashRepaymentAmounts(IPartyPool pool, uint256[] memory loanAmounts) external view
+        returns (uint256[] memory repaymentAmounts);
+
+    /**
+     * @dev The amount of currency available to be lent.
+     * @param token The loan currency.
+     * @return The amount of `token` that can be borrowed.
+     */
+    function maxFlashLoan(IPartyPool pool, address token) external view returns (uint256);
+
+    /**
+     * @dev The fee to be charged for a given loan.
+     * @param amount The amount of tokens lent.
+     * @return fee The amount of `token` to be charged for the loan, on top of the returned principal.
+     */
+    function flashFee(IPartyPool pool, address token, uint256 amount) external view returns (uint256 fee);
+}

src/PartyPoolViewer.sol

@@ -8,8 +8,9 @@ import {LMSRStabilized} from "./LMSRStabilized.sol";
 import {PartyPoolHelpers} from "./PartyPoolHelpers.sol";
 import {PartyPoolMintImpl} from "./PartyPoolMintImpl.sol";
 import {PartyPoolSwapImpl} from "./PartyPoolSwapImpl.sol";
+import {IPartyPoolViewer} from "./IPartyPoolViewer.sol";
 
-contract PartyPoolViewer is PartyPoolHelpers {
+contract PartyPoolViewer is PartyPoolHelpers, IPartyPoolViewer {
     using ABDKMath64x64 for int128;
 
     PartyPoolSwapImpl immutable internal SWAP_IMPL;
@@ -177,5 +178,4 @@ contract PartyPoolViewer is PartyPoolHelpers {
         (fee,) = _computeFee(amount, pool.flashFeePpm());
     }
 
-
 }