// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.24;

import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "./ReputationHolder.sol";

struct Stake {
    bool inFavor;
    uint256 amount;
    address worker;
}

enum ValidationPoolStatus {
    Open,
    Closed
}

struct ValidationPool {
    mapping(uint => Stake) stakes;
    uint stakeCount;
    ValidationPoolStatus status;
}

/// This contract must manage validation pools and reputation,
/// because otherwise there's no way to enforce appropriate permissions on
/// transfer of value between reputation NFTs.
contract DAO is ERC721("Reputation", "REP"), ReputationHolder {
    mapping(uint256 tokenId => uint256) tokenValues;
    uint256 nextTokenId;
    mapping(uint => ValidationPool) validationPools;
    uint validationPoolCount;

    /// Inspect the value of a given reputation NFT
    function valueOf(uint256 tokenId) public view returns (uint256 value) {
        value = tokenValues[tokenId];
    }

    /// Internal function to mint a new reputation NFT
    function mint() internal returns (uint256 tokenId) {
        // Generate a new (sequential) ID for the token
        tokenId = nextTokenId++;
        // Mint the token, initially to be owned by the current contract.
        _mint(address(this), tokenId);
    }

    /// Internal function to transfer value from one reputation token to another
    function transferValueFrom(
        uint256 fromTokenId,
        uint256 toTokenId,
        uint256 amount
    ) internal {
        require(amount >= 0);
        require(valueOf(fromTokenId) >= amount);
        tokenValues[fromTokenId] -= amount;
        tokenValues[toTokenId] += amount;
    }

    /// Accept fee to initiate a validation pool
    function initiateValidationPool() public {}

    /// Accept reputation stakes toward a validation pool
    function onERC721Received(
        address,
        address from,
        uint256 tokenId,
        bytes calldata
    ) public override returns (bytes4) {
        return super.onERC721Received.selector;
    }
}