voting.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

/**
 * @title Voting
 * @dev Store & retrieve value in a variable
 * @custom:dev-run-script ./scripts/deploy_with_ethers.ts
 */
contract Voting {

    struct vote {
        bool finalized;
        uint slot;
        uint votes;
    }

    mapping(bytes => mapping(address => bool)) public voted;
    mapping(bytes => vote) public committeed;
    mapping(address => uint) public balances;
    uint staked;
    uint slot;
    bytes lastSnapshot;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function stake(uint256 num) public {
        balances[msg.sender] = num;
        staked += num;
    }

    /**
     * @dev Return value 
     */
    function voteOn(bytes calldata root) public {
        require(committeed[root].finalized == false);
        require(balances[msg.sender] > 0);

        committeed[root].votes += balances[msg.sender];

        if (committeed[root].votes >= quorum()) {
            committeed[root].slot = slot;
            lastSnapshot = root;
            slot++;
        }
    }

    function getSlot() view public returns (uint) {
        return slot;
    }

    function getLastSnapshot() view public returns (bytes memory) {
        return lastSnapshot;
    }

    function quorum() pure internal  returns (uint) {
        return 75;
    }
}