ToyDEX — 幻影スワップ — PhantomSwap

contract GameToken is ERC1155 {
    // トークンID = アセット種別
    uint256 public constant GAME_USD = 0;
    uint256 public constant GAME_BTC = 1;
    uint256 public constant GAME_ETH = 2;
    uint256 public constant GAME_GOLD = 3;

    // ★核心：transfer系関数を全て無効化（Soulbound）
    function safeTransferFrom(...) public pure override {
        revert("SOULBOUND: transfers disabled");
    }

    // mint/burnはcontroller（ToyDEX.sol）のみ
    function mint(address to, uint256 id, uint256 amount)
        external onlyController { ... }
}

contract ToyDEX {
    uint256 public constant INITIAL_GAME_USD = 100_000 * 1e18;
    uint256 public constant SWAP_FEE_BPS = 30; // 0.3%

    function register() external {
        token.mint(msg.sender, GAME_USD, INITIAL_GAME_USD);
    }

    function swap(uint256 fromAsset, uint256 toAsset, uint256 amount) external {
        uint256 fromPrice = oracle.getPrice(fromAsset);
        uint256 toPrice = oracle.getPrice(toAsset);
        uint256 toAmount = (amount * fromPrice / toPrice) * 9970 / 10000;
        token.burn(msg.sender, fromAsset, amount);
        token.mint(msg.sender, toAsset, toAmount);
    }

    function portfolioValue(address player) external view returns (uint256) {
        // 全アセットの残高 × 価格を合算
    }
}

contract PriceOracle {
    mapping(uint256 => AggregatorV3Interface) public feeds;

    function getPrice(uint256 assetId) external view returns (uint256) {
        if (assetId == 0) return 1e18; // GameUSD固定
        (, int256 price,, uint256 updatedAt,) = feeds[assetId].latestRoundData();
        require(block.timestamp - updatedAt < 1 hours, "Stale");
        return uint256(price) * 1e10; // 8→18 decimals
    }
}