// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// File: contracts/BurnXenBitcoinEth.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract ConvertXenBitcoinEthereumX1 {
    address public XBTC;
    address public USDC;


    mapping(address => uint256) public amountXBTCBurned;
    mapping(address => uint256) public amountUSDCDeposited;
    address[] public addresses;


    mapping(address => uint256) public futureXBTC;


    uint256 public totalXBTCBurned;
    uint256 public totalUSDCDeposited;


    address private constant DEAD_ADDRESS = address(0x000000000000000000000000000000000000dEaD);
    address private constant BA_ADDRESS = address(0x99726763dd9C1537EDd27CC384ED3808E475F81C);


    event BurnXBTC(address indexed burner, uint indexed _amount, uint indexed currentTime);
    event DepositUSDC(address indexed burner, uint indexed _amount, uint indexed currentTime);


    constructor(address _XBTC, address _USDC) {
        XBTC = _XBTC; // 18 decimals
        USDC = _USDC; // 6 decimals

    }

    function burnXBTC(uint amount) public {
        require(amount > 0, "amount can't be zero");
        require(IERC20(XBTC).transferFrom(msg.sender, DEAD_ADDRESS, amount), "transferFrom failed.");

        if (futureXBTC[msg.sender] == 0) {
            addresses.push(msg.sender);
        }

        amountXBTCBurned[msg.sender] += amount;
        futureXBTC[msg.sender] += amount * 10_000;
        totalXBTCBurned += amount;

        emit BurnXBTC(msg.sender, amount, block.timestamp);
    }

    function depositUSDC(uint amount) public {
        require(amount > 0, "amount can't be zero");
        require(amount + totalUSDCDeposited <= 5_000_000 * 1e6);
        require(IERC20(USDC).transferFrom(msg.sender, BA_ADDRESS, amount), "transferFrom failed.");

        if (futureXBTC[msg.sender] == 0) {
            addresses.push(msg.sender);
        }

        amountUSDCDeposited[msg.sender] += amount;
        futureXBTC[msg.sender] += amount * 1e12 * 200_000;  // convert from 6 decimals to 18
        totalUSDCDeposited += amount;

        emit DepositUSDC(msg.sender, amount, block.timestamp);
    }


}

/*
PulseChain
0xB971a3429c04d96F8a75EDaC7bc79e7C4672b4E6

Binance Smart Chain
0xddA8D1Fd0D42F2cb43f625e6D3F13eb2CDEF983f

Ethereum
0x4792d3CA30d52821b0dC2b2436CF8B425C3395F1

*/