feat: implement Djed Tefnut protocol as Djed Shu simplification

TODO.md

@@ -0,0 +1,90 @@
+# Djed Tefnut Implementation Plan
+
+## Information Gathered:
+- Current DjedShu implementation with reserve ratio constraints, sellBothCoins function, and linear treasury fee decay
+- Oracle interface (IOracleShu) with dual-oracle logic (max/min prices)
+- Deployment infrastructure with parameter configurations
+- Test files that reference sellBothCoins functionality
+
+
+## Plan: Detailed Code Update Plan (REVISED)
+
+
+### Step 1: Create DjedTefnut.sol by Forking DjedShu ✅ COMPLETED
+- Create DjedTefnut that inherits from DjedShu (minimal reimplementation)
+- Remove reserve ratio constraints:
+  - Remove `reserveRatioMin` and `reserveRatioMax` parameters from constructor
+  - Remove `isRatioAboveMin()` and `isRatioBelowMax()` functions
+  - Remove ratio validation checks in trading functions
+  - Remove `ratioMax()` and `ratioMin()` functions
+- Remove `sellBothCoins()` function completely (all implementations and calls)
+- Remove linear treasury fee decay mechanism:
+  - Remove `treasuryRevenue` tracking variable
+  - Simplify `treasuryFee()` to return constant `initialTreasuryFee`
+- Preserve dual-oracle logic exactly as-is
+- Update events (remove SoldBothCoins event)
+
+### Step 2: Update Deployment Configuration ✅ COMPLETED
+- Add minimal Tefnut configuration to existing deployment scripts
+- Reuse ETH-based deployment flow, just add Tefnut version
+
+### Step 3: Create Targeted Tests ✅ COMPLETED
+- Create DjedTefnut test file focused on removed features verification
+- Test that removed features are not callable
+- Test mint/redeem works with both oracle prices
+- Ensure behavior identical to Shu except removed constraints
+
+### Step 4: Verify Implementation ✅ COMPLETED
+- Compile contracts successfully
+- Run tests to verify core functionality
+- Ensure deployment compatibility
+
+## Summary of Changes Made:
+
+### DjedTefnut.sol Contract:
+1. ✅ **Removed reserve ratio constraints**: Eliminated `reserveRatioMin`, `reserveRatioMax` parameters and related validation functions (`isRatioAboveMin`, `isRatioBelowMax`, `ratioMax`, `ratioMin`)
+2. ✅ **Removed sellBothCoins function**: Completely eliminated the `sellBothCoins()` function and `SoldBothCoins` event
+3. ✅ **Removed linear treasury fee decay**: Simplified `treasuryFee()` to return constant `initialTreasuryFee`, removed `treasuryRevenue` tracking
+4. ✅ **Preserved dual-oracle logic**: Maintained all oracle interface functionality and price reading mechanisms
+5. ✅ **Updated constructor**: Removed unused parameters, simplified parameter list
+
+### Deployment Configuration:
+- ✅ **Created deployment script**: `deployDjedTefnutContract.sol` with proper parameter configuration
+- ✅ **Updated foundry.toml**: Added `via_ir = true` to handle compiler stack depth issues
+
+### Test Coverage:
+- ✅ **Created comprehensive tests**: `DjedTefnut.t.sol` with tests for:
+  - Removed functions verification (bytecode scanning)
+  - Treasury fee constant behavior
+  - Basic mint/redeem functionality
+  - Oracle price integration
+  - Constructor parameter validation
+
+### Key Features Removed:
+- ❌ `reserveRatioMin` and `reserveRatioMax` parameters
+- ❌ `sellBothCoins()` function 
+- ❌ `isRatioAboveMin()` and `isRatioBelowMax()` functions
+- ❌ `ratioMax()` and `ratioMin()` functions
+- ❌ Linear treasury fee decay mechanism
+- ❌ `treasuryRevenue` tracking variable
+- ❌ `SoldBothCoins` event
+
+### Key Features Preserved:
+- ✅ Dual-oracle logic (max/min prices)
+- ✅ Core mint/redeem flows
+- ✅ ETH-based deployment infrastructure
+- ✅ Treasury fee collection (constant rate)
+- ✅ Transaction limits and safety checks
+
+## Acceptance Criteria Status:
+- ✅ **Contracts compile and deploy successfully**: All contracts compile without errors
+- ✅ **All removed features are fully eliminated**: Verified through bytecode analysis and compilation tests
+- ✅ **Core mint/redeem flows work with two oracle prices**: Tests confirm dual-oracle functionality preserved
+- ✅ **Compatibility with existing ETH-based deployment flow**: Deployment script integrates with existing infrastructure
+
+## Files Created/Modified:
+1. `src/DjedTefnut.sol` - New simplified contract
+2. `scripts/deployDjedTefnutContract.sol` - Deployment script
+3. `src/test/DjedTefnut.t.sol` - Test suite
+4. `foundry.toml` - Updated for via_ir compilation
+5. `TODO.md` - This implementation plan (completed)

foundry.toml

@@ -5,5 +5,6 @@ libs = ['node_modules', 'lib']
 remappings = [
     '@chainlink/contracts/=node_modules/@chainlink/contracts'
 ]
+via_ir = true
 
 # See more config options https://github.com/foundry-rs/foundry/tree/master/config

scripts/deployDjedTefnutContract.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.19;
+
+import "forge-std/Script.sol";
+import "./DeploymentParameters.sol";
+import {DjedTefnut} from "../src/DjedTefnut.sol";
+
+contract DeployDjedTefnut is Script, DeploymentParameters {
+    function run(SupportedNetworks network, SupportedVersion version) external {
+        uint256 INITIAL_BALANCE = 0;
+        uint256 senderPrivateKey = vm.envUint("PRIVATE_KEY");
+
+        vm.startBroadcast(senderPrivateKey);
+        (
+            address oracleAddress,
+            address treasuryAddress,
+            uint256 SCALING_FACTOR,
+            uint256 INITIAL_TREASURY_FEE,
+            uint256 FEE,
+            uint256 THREASHOLD_SUPPLY_SC,
+            uint256 RESERVE_COIN_MINIMUM_PRICE,
+            uint256 RESERVE_COIN_INITIAL_PRICE,
+            uint256 TX_LIMIT
+        ) = getTefnutConfigFromNetwork(network, version);
+
+        DjedTefnut djedTefnut = new DjedTefnut{value: INITIAL_BALANCE}(
+            oracleAddress,
+            SCALING_FACTOR,
+            treasuryAddress,
+            INITIAL_TREASURY_FEE,
+            FEE,
+            THREASHOLD_SUPPLY_SC,
+            RESERVE_COIN_MINIMUM_PRICE,
+            RESERVE_COIN_INITIAL_PRICE,
+            TX_LIMIT
+        );
+
+        console.log(
+            "Djed Tefnut contract deployed: ",
+            address(djedTefnut)
+        );
+        vm.stopBroadcast();
+    }
+
+    function getTefnutConfigFromNetwork(
+        SupportedNetworks network,
+        SupportedVersion version
+    )
+        internal
+        pure
+        returns (
+            address, address, 
+            uint256, uint256, uint256, uint256, uint256, uint256, uint256
+        )
+    {
+        // For Tefnut, we use the same oracle addresses as DjedShu but with simplified parameters
+        if (network == SupportedNetworks.ETHEREUM_SEPOLIA) {
+            return (
+                0xB9C050Fd340aD5ED3093F31aAFAcC3D779f405f4, // CHAINLINK_SEPOLIA_INVERTED_ORACLE_ADDRESS
+                0x0f5342B55ABCC0cC78bdB4868375bCA62B6c16eA, // treasury address
+                1e24, // SCALING_FACTOR
+                25e20, // INITIAL_TREASURY_FEE
+                15e21, // FEE
+                5e11, // THREASHOLD_SUPPLY_SC
+                1e18, // RESERVE_COIN_MINIMUM_PRICE
+                1e20, // RESERVE_COIN_INITIAL_PRICE
+                1e10 // TX_LIMIT
+            );
+        }
+
+        if (network == SupportedNetworks.ETHEREUM_CLASSIC_MORDOR) {
+            return (
+                0x8Bd4A5F6a4727Aa4AC05f8784aACAbE2617e860A, // HEBESWAP_SHU_ORACLE_INVERTED_ADDRESS_MORDOR
+                0xBC80a858F6F9116aA2dc549325d7791432b6c6C4, // treasury address
+                1e24, // SCALING_FACTOR
+                25e20, // INITIAL_TREASURY_FEE
+                12500e18, // FEE
+                10e6, // THREASHOLD_SUPPLY_SC
+                1e15, // RESERVE_COIN_MINIMUM_PRICE
+                1e18, // RESERVE_COIN_INITIAL_PRICE
+                1e10 // TX_LIMIT
+            );
+        }
+
+        if (network == SupportedNetworks.ETHEREUM_CLASSIC_MAINNET) {
+            return (
+                0x8Bd4A5F6a4727Aa4AC05f8784aACAbE2617e860A, // Using same as Mordor for now
+                0xBC80a858F6F9116aA2dc549325d7791432b6c6C4, // treasury address
+                1e24, // SCALING_FACTOR
+                25e20, // INITIAL_TREASURY_FEE
+                12500e18, // FEE
+                10e6, // THREASHOLD_SUPPLY_SC
+                1e15, // RESERVE_COIN_MINIMUM_PRICE
+                1e18, // RESERVE_COIN_INITIAL_PRICE
+                1e10 // TX_LIMIT
+            );
+        }
+
+        // Default values (should not reach here)
+        revert("Unsupported network for Tefnut deployment");
+    }
+}

src/DjedTefnut.sol

@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: AEL
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/utils/math/Math.sol";
+import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
+import "./Coin.sol";
+import "./IOracleShu.sol";
+
+contract DjedTefnut is ReentrancyGuard {
+    IOracleShu public oracle;
+    Coin public stableCoin;
+    Coin public reserveCoin;
+
+
+    // Treasury Parameters:
+    address public immutable treasury; // address of the treasury
+    uint256 public immutable initialTreasuryFee; // initial fee to fund the treasury
+
+    // Djed Parameters:
+    uint256 public immutable fee;
+    uint256 public immutable thresholdSupplySC;
+    uint256 public immutable rcMinPrice;
+    uint256 public immutable rcInitialPrice;
+    uint256 public immutable txLimit;
+
+    // Scaling factors:
+    uint256 public immutable scalingFactor; // used to represent a decimal number `d` as the uint number `d * scalingFactor`
+    uint256 public immutable scDecimalScalingFactor;
+    uint256 public immutable rcDecimalScalingFactor;
+
+    event BoughtStableCoins(address indexed buyer, address indexed receiver, uint256 amountSC, uint256 amountBC);
+    event SoldStableCoins(address indexed seller, address indexed receiver, uint256 amountSC, uint256 amountBC);
+    event BoughtReserveCoins(address indexed buyer, address indexed receiver, uint256 amountRC, uint256 amountBC);
+    event SoldReserveCoins(address indexed seller, address indexed receiver, uint256 amountRC, uint256 amountBC);
+
+
+    constructor(
+        address oracleAddress, uint256 _scalingFactor,
+        address _treasury, uint256 _initialTreasuryFee,
+        uint256 _fee, uint256 _thresholdSupplySC, uint256 _rcMinPrice, uint256 _rcInitialPrice, uint256 _txLimit
+    ) payable {
+        stableCoin = new Coin("StableCoin", "SC");
+        reserveCoin = new Coin("ReserveCoin", "RC");
+        scDecimalScalingFactor = 10**stableCoin.decimals();
+        rcDecimalScalingFactor = 10**reserveCoin.decimals();
+        scalingFactor = _scalingFactor;
+
+        treasury = _treasury;
+        initialTreasuryFee = _initialTreasuryFee;
+
+        fee = _fee;
+        thresholdSupplySC = _thresholdSupplySC;
+        rcMinPrice = _rcMinPrice;
+        rcInitialPrice = _rcInitialPrice;
+        txLimit = _txLimit;
+
+        oracle = IOracleShu(oracleAddress);
+        oracle.acceptTermsOfService();
+    }
+
+    // Reserve, Liabilities, Equity (in weis) and Reserve Ratio
+    function R(uint256 _currentPaymentAmount) public view returns (uint256) {
+        return address(this).balance - _currentPaymentAmount;
+    }
+
+    function L(uint256 _scPrice) internal view returns (uint256) {
+        return (stableCoin.totalSupply() * _scPrice) / scDecimalScalingFactor;
+    } // sell both coin -> min price
+
+    function L() external view returns (uint256) {
+        return L(scMaxPrice(0));
+    }
+
+    function E(uint256 _scPrice, uint256 _currentPaymentAmount) internal view returns (uint256) {
+        return R(_currentPaymentAmount) - L(_scPrice);
+    } // rcTargetPrice -> sell RC -> min price
+
+    function E(uint256 _currentPaymentAmount) external view returns (uint256) {
+        return E(scMaxPrice(_currentPaymentAmount), _currentPaymentAmount);
+    }
+
+    // # Public Trading Functions:
+    // scMaxPrice
+    function buyStableCoins(address receiver, uint256 feeUI, address ui) external payable nonReentrant {
+        oracle.updateOracleValues();
+        uint256 scP = scMaxPrice(msg.value);
+        uint256 amountBC = deductFees(msg.value, feeUI, ui); // side-effect: increases `treasuryRevenue` and pays UI and treasury
+        uint256 amountSC = (amountBC * scDecimalScalingFactor) / scP;
+        require(amountSC <= txLimit || stableCoin.totalSupply() < thresholdSupplySC, "buySC: tx limit exceeded");
+        require(amountSC > 0, "buySC: receiving zero SCs");
+        stableCoin.mint(receiver, amountSC);
+        emit BoughtStableCoins(msg.sender, receiver, amountSC, msg.value);
+    }
+
+    function sellStableCoins(uint256 amountSC, address receiver, uint256 feeUI, address ui) external nonReentrant {
+        oracle.updateOracleValues();
+        require(stableCoin.balanceOf(msg.sender) >= amountSC, "sellSC: insufficient SC balance");
+        require(amountSC <= txLimit || stableCoin.totalSupply() < thresholdSupplySC, "sellSC: tx limit exceeded");
+        uint256 scP = scMinPrice(0);
+        uint256 value = (amountSC * scP) / scDecimalScalingFactor;
+        uint256 amountBC = deductFees(value, feeUI, ui); // side-effect: increases `treasuryRevenue` and pays UI and treasury
+        require(amountBC > 0, "sellSC: receiving zero BCs");
+        stableCoin.burn(msg.sender, amountSC);
+        transfer(receiver, amountBC);
+        emit SoldStableCoins(msg.sender, receiver, amountSC, amountBC);
+    }
+
+    function buyReserveCoins(address receiver, uint256 feeUI, address ui) external payable nonReentrant {
+        oracle.updateOracleValues();
+        uint256 scP = scMinPrice(msg.value);
+        uint256 rcBP = rcBuyingPrice(scP, msg.value);
+        uint256 amountBC = deductFees(msg.value, feeUI, ui); // side-effect: increases `treasuryRevenue` and pays UI and treasury
+        require(amountBC <= (txLimit * scP) / scDecimalScalingFactor || stableCoin.totalSupply() < thresholdSupplySC, "buyRC: tx limit exceeded");
+        uint256 amountRC = (amountBC * rcDecimalScalingFactor) / rcBP;
+        require(amountRC > 0, "buyRC: receiving zero RCs");
+        reserveCoin.mint(receiver, amountRC);
+        emit BoughtReserveCoins(msg.sender, receiver, amountRC, msg.value);
+    }
+
+    function sellReserveCoins(uint256 amountRC, address receiver, uint256 feeUI, address ui) external nonReentrant {
+        oracle.updateOracleValues();
+        require(reserveCoin.balanceOf(msg.sender) >= amountRC, "sellRC: insufficient RC balance");
+        uint256 scP = scMaxPrice(0);
+        uint256 value = (amountRC * rcTargetPrice(scP, 0)) / rcDecimalScalingFactor;
+        require(value <= (txLimit * scP) / scDecimalScalingFactor || stableCoin.totalSupply() < thresholdSupplySC, "sellRC: tx limit exceeded");
+        uint256 amountBC = deductFees(value, feeUI, ui); // side-effect: increases `treasuryRevenue` and pays UI and treasury
+        require(amountBC > 0, "sellRC: receiving zero BCs");
+        reserveCoin.burn(msg.sender, amountRC);
+        transfer(receiver, amountBC);
+        emit SoldReserveCoins(msg.sender, receiver, amountRC, amountBC);
+    }
+
+
+    // # Auxiliary Functions
+
+    function deductFees(uint256 value, uint256 feeUI, address ui) internal returns (uint256) {
+        uint256 f = (value * fee) / scalingFactor;
+        uint256 fUI = (value * feeUI) / scalingFactor;
+        uint256 fT = (value * treasuryFee()) / scalingFactor;
+        transfer(treasury, fT);
+        transfer(ui, fUI);
+        // transfer(address(this), f); // this happens implicitly, and thus `f` is effectively transfered to the reserve.
+        return value - f - fUI - fT; // amountBC
+    }
+
+    // Treasury Fee: constant fee for Tefnut (no linear decay)
+    function treasuryFee() public view returns (uint256) {
+        return initialTreasuryFee;
+    }
+
+    // # Price Functions: return the price in weis for 1 whole coin.
+
+    function scPrice(uint256 _currentPaymentAmount, uint256 scTargetPrice) private view returns (uint256) {
+        uint256 sSC = stableCoin.totalSupply();
+        return sSC == 0
+                ? scTargetPrice
+                : Math.min(scTargetPrice, (R(_currentPaymentAmount) * scDecimalScalingFactor) / sSC);
+    }
+
+    function scMaxPrice(uint256 _currentPaymentAmount) public view returns (uint256) {
+        (uint256 scTargetPrice, ) = oracle.readMaxPrice();
+        return scPrice(_currentPaymentAmount, scTargetPrice);
+    }
+
+    function scMinPrice(uint256 _currentPaymentAmount) public view returns (uint256) {
+        (uint256 scTargetPrice, ) = oracle.readMinPrice();
+        return scPrice(_currentPaymentAmount, scTargetPrice);
+    }
+
+    function rcTargetPrice(uint256 _currentPaymentAmount) external view returns (uint256) {
+        return rcTargetPrice(scMaxPrice(_currentPaymentAmount), _currentPaymentAmount);
+    } // for sell rc -> we should use min price
+
+    function rcTargetPrice(uint256 _scPrice, uint256 _currentPaymentAmount) internal view returns (uint256)
+    {
+        uint256 sRC = reserveCoin.totalSupply();
+        require(sRC != 0, "RC supply is zero");
+        return (E(_scPrice, _currentPaymentAmount) * rcDecimalScalingFactor) / sRC;
+    }
+
+    function rcBuyingPrice(uint256 _currentPaymentAmount) external view returns (uint256) {
+        return rcBuyingPrice(scMaxPrice(_currentPaymentAmount), _currentPaymentAmount);
+    }
+
+    function rcBuyingPrice(uint256 _scPrice, uint256 _currentPaymentAmount) internal view returns (uint256) {
+        return reserveCoin.totalSupply() == 0
+                ? rcInitialPrice
+                : Math.max(rcTargetPrice(_scPrice, _currentPaymentAmount), rcMinPrice);
+    }
+
+    function transfer(address receiver, uint256 amount) internal {
+        (bool success, ) = payable(receiver).call{value: amount}("");
+        require(success, "Transfer failed.");
+    }
+}
+
+// The worst price depends on the operation. For example, for "Buy stablecoin", the worst price is the max price. But, for "sell stablecoin", the worst price is the min price.