// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;

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

contract NSwap is Ownable {
    IERC20 public navisToken;

    // Fee percentage for token swaps (0.3%)
    uint256 public swapFeePercentage = 3;

    event TokensSwapped(address indexed user, uint256 inputAmount, uint256 outputAmount);

    constructor(address _navisToken) {
        navisToken = IERC20(_navisToken);
    }

    // Function to swap tokens with a 0.3% fee
    function swapTokens(uint256 inputAmount) external {
        require(inputAmount > 0, "Input amount must be greater than zero");

        // Calculate swap fee
        uint256 swapFee = (inputAmount * swapFeePercentage) / 1000;

        // Calculate output amount after deducting the fee
        uint256 outputAmount = inputAmount - swapFee;

        // Transfer input tokens from the user to this contract
        require(navisToken.transferFrom(msg.sender, address(this), inputAmount), "Transfer failed");

        // Transfer output tokens to the user after deducting the fee
        require(navisToken.transfer(msg.sender, outputAmount), "Transfer failed");

        // Emit TokensSwapped event
        emit TokensSwapped(msg.sender, inputAmount, outputAmount);
    }

    // Function to set the swap fee percentage (onlyOwner)
    function setSwapFeePercentage(uint256 _swapFeePercentage) external onlyOwner {
        require(_swapFeePercentage <= 1000, "Fee percentage cannot exceed 100%");
        swapFeePercentage = _swapFeePercentage;
    }
}