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//SPDX-License-Identifier: BSD 3-Clause
pragma solidity 0.8.13;

import {ERC20} from "solmate/tokens/ERC20.sol";

/// @title TPlusNAsset
/// @notice An ERC20 contract used by TPlusNPortfolio contracts to represent their underlying asset
contract TPlusNAsset is ERC20 {
    /// STATE

    /// @notice Address of the Endaoment Portfolio / Minter.
    address public portfolio;

    /// EVENTS
    event PortfolioSet(address indexed newPortfolio);

    /// ERRORS

    /// @notice Emitted when bad caller on portfolio-only calls.
    error OnlyPortfolio();

    constructor(string memory _name, string memory _symbol, address _portfolio) ERC20(_name, _symbol, 18) {
        portfolio = _portfolio;
        emit PortfolioSet(_portfolio);
    }

    /// MODIFIERS

    /**
     * @notice Make function only callable by the owning portfolio.
     */
    modifier onlyPortfolio() {
        _onlyPortfolio();
        _;
    }

    /**
     * @notice Internal function to check that the caller is the owning portfolio.
     * @dev Added for gas savings.
     */
    function _onlyPortfolio() private view {
        if (msg.sender != portfolio) revert OnlyPortfolio();
    }

    /**
     * @notice Mint assets for a given address.
     * @param _to The address to mint to.
     * @param _amount The amount to mint.
     * @dev Only callable by the owning portfolio.
     */
    function mint(address _to, uint256 _amount) external onlyPortfolio {
        _mint(_to, _amount);
    }

    /**
     * @notice Burn assets from a given address.
     * @param _from The address to burn from.
     * @param _amount The amount to burn.
     * @dev Only callable by the owning portfolio.
     */
    function burn(address _from, uint256 _amount) external onlyPortfolio {
        _burn(_from, _amount);
    }

    /**
     * @notice Burn assets from the caller.
     * @param _amount The amount to burn.
     * @dev Callable by anyone since it burns from the caller's balance.
     */
    function burn(uint256 _amount) external {
        _burn(msg.sender, _amount);
    }

    /**
     * @notice Update the owning portfolio
     * @param _newPortfolio The new portfolio address
     * @notice Should be rarely used but can be in case of a portfolio migration, to be able to use the same asset contract
     * @dev Only callable by the current portfolio
     */
    function setPortfolio(address _newPortfolio) external onlyPortfolio {
        portfolio = _newPortfolio;
        emit PortfolioSet(_newPortfolio);
    }
}

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

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*///////////////////////////////////////////////////////////////
                                  EVENTS
    //////////////////////////////////////////////////////////////*/

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

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*///////////////////////////////////////////////////////////////
                             METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*///////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*///////////////////////////////////////////////////////////////
                             EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    bytes32 public constant PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*///////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*///////////////////////////////////////////////////////////////
                              ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*///////////////////////////////////////////////////////////////
                              EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR(),
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );

            address recoveredAddress = ecrecover(digest, v, r, s);

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*///////////////////////////////////////////////////////////////
                       INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

{
  "remappings": [
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "murky/=lib/murky/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/solmate/src/",
    "weird-erc20/=lib/solmate/lib/weird-erc20/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 9999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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