TransactiveEnergy-BNB

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract TransactiveEnergy-BNB {
    
    address public owner;
    uint public energyPrice;
    uint public energyAvailable;
    IERC20 public token;
    
    event EnergyPriceSet(uint energyPrice);
    event EnergyAvailableSet(uint energyAvailable);
    event EnergyBought(address buyer, uint energyAmount, uint paymentAmount);
    
    constructor(address _token) {
        owner = msg.sender;
        energyPrice = 0;
        energyAvailable = 0;
        token = IERC20(_token);
    }
    
    function setEnergyPrice(uint _energyPrice) public {
        require(msg.sender == owner, "Only the owner can set the energy price");
        energyPrice = _energyPrice;
        emit EnergyPriceSet(energyPrice);
    }
    
    function setEnergyAvailable(uint _energyAvailable) public {
        require(msg.sender == owner, "Only the owner can set the available energy");
        energyAvailable = _energyAvailable;
        emit EnergyAvailableSet(energyAvailable);
    }
    
    function buyEnergy(uint _energyAmount) public {
        uint paymentAmount = energyPrice * _energyAmount;
        require(paymentAmount > 0, "Invalid payment amount");
        require(_energyAmount <= energyAvailable, "Not enough energy available");
        token.transferFrom(msg.sender, owner, paymentAmount);
        energyAvailable -= _energyAmount;
        emit EnergyBought(msg.sender, _energyAmount, paymentAmount);
    }
}