Detailed explanation of PensionFiDAO

1. Token Issuance:
• The DAO issues pension tokens (let's call them PFT - PensionFi Tokens) that represent shares in the fund.
• Contributors receive PFT in proportion to their contributions.

2. Fund Management:
• The DAO invests in a diversified portfolio of DeFi assets, including: a) Lending platforms b) Automated market makers (AMMs) c) Yield farming strategies d) Tokenized real-world assets

3. Governance:
• PFT holders can vote on key decisions, such as: a) Investment strategies b) Risk parameters c) Fee structures d) Protocol upgrades

4. Automated Portfolio Management:
• Smart contracts automatically rebalance the portfolio based on the risk parameters and strategies voted on by token holders.

5. Contributions:
• Users can make regular or one-time contributions to the fund.
• Contributions are converted into PFT based on the current net asset value (NAV) of the fund.

6. Withdrawals:
• Users can withdraw funds by burning their PFT.
• Withdrawals are subject to vesting periods and possible early withdrawal penalties to ensure long-term stability of the fund.

7. Transparency:
• All transactions and investment activities are recorded on the blockchain, providing real-time transparency to contributors.

8. Yield Distribution:
• Yields generated from DeFi investments are either reinvested to grow the fund or distributed to token holders, depending on the governance decisions.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract PensionFiToken is ERC20, AccessControl, ReentrancyGuard {
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");

    uint256 public constant VESTING_PERIOD = 365 days;
    uint256 public constant EARLY_WITHDRAWAL_FEE = 10; // 10%

    struct Contribution {
        uint256 amount;
        uint256 timestamp;
    }

    mapping(address => Contribution[]) public contributions;

    uint256 public totalFundValue;

    event Contribute(address indexed user, uint256 amount);
    event Withdraw(address indexed user, uint256 amount, uint256 fee);
    event FundValueUpdated(uint256 newValue);

    constructor() ERC20("PensionFi Token", "PFT") {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(MANAGER_ROLE, msg.sender);
    }

    function contribute() external payable nonReentrant {
        require(msg.value > 0, "Contribution must be greater than 0");

        uint256 tokensToMint = (msg.value * totalSupply()) / totalFundValue;
        _mint(msg.sender, tokensToMint);

        contributions[msg.sender].push(Contribution(msg.value, block.timestamp));
        totalFundValue += msg.value;

        emit Contribute(msg.sender, msg.value);
    }

    function withdraw(uint256 amount) external nonReentrant {
        require(balanceOf(msg.sender) >= amount, "Insufficient balance");

        uint256 ethToWithdraw = (amount * totalFundValue) / totalSupply();
        uint256 fee = 0;

        // Check vesting period and apply early withdrawal fee if necessary
        Contribution[] storage userContributions = contributions[msg.sender];
        for (uint i = 0; i < userContributions.length; i++) {
            if (block.timestamp - userContributions[i].timestamp < VESTING_PERIOD) {
                fee += (ethToWithdraw * EARLY_WITHDRAWAL_FEE) / 100;
                break;
            }
        }

        uint256 finalWithdrawal = ethToWithdraw - fee;

        _burn(msg.sender, amount);
        totalFundValue -= ethToWithdraw;

        payable(msg.sender).transfer(finalWithdrawal);
        if (fee > 0) {
            // Transfer fee to DAO treasury or redistribute to remaining token holders
        }

        emit Withdraw(msg.sender, finalWithdrawal, fee);
    }

    function updateFundValue(uint256 newValue) external onlyRole(MANAGER_ROLE) {
        totalFundValue = newValue;
        emit FundValueUpdated(newValue);
    }

    function proposeInvestment(address target, bytes memory data) external onlyRole(MANAGER_ROLE) {
        // In a real implementation, this would create a proposal for token holders to vote on
    }

    function executeInvestment(address target, bytes memory data) external onlyRole(MANAGER_ROLE) {
        // In a real implementation, this would only be callable after a successful vote
        (bool success, ) = target.call(data);
        require(success, "Investment execution failed");
    }

    // Governance functions would be added here, such as:
    // - createProposal
    // - castVote
    // - executeProposal

    // Additional functions for interacting with DeFi protocols would be implemented here

    receive() external payable {
        // Handle incoming ETH (e.g., from DeFi investments)
    }
}