// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

contract ElonSnail {
    
    string public constant name = "ElonSnail";
    string public constant symbol = "SNAIL";
    uint8 public constant decimals = 18; 

    event Transfer(address indexed from, address indexed to, uint tokens);
    event approval (address indexed tokenOwner, address indexed spender, uint tokens);
    
    uint256 totalSupply_;

    mapping(address => uint256) balances;
    mapping(address => mapping (address => uint256) ) allowed; 


    constructor(){
        totalSupply_ = 1000000000000000000000000000000;
        balances[msg.sender] = totalSupply_;
    }
    function totalSupply() public view returns (uint256){
        return totalSupply_;

    }
    function balanceOf(address tokenOwner) public view returns(uint){
        return balances[tokenOwner];

    }
    function transfer (address receiver, uint numTokens) public returns (bool){
        require(numTokens <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender] - numTokens;
        balances[receiver] = balances[receiver] + numTokens;
        emit Transfer(msg.sender, receiver, numTokens);
        return true; 
    }
    function approve(address delegate, uint numTokens) public returns (bool){
        allowed[msg.sender][delegate] = numTokens;
        emit approval(msg.sender,delegate, numTokens);
        return true;

    }    
    function allowance (address owner, address delegate) public view returns (uint){
        return allowed[owner][delegate];

    }
    function transferFrom(address owner, address buyer, uint numTokens) public returns (bool){
        require (numTokens<= balances[owner]);
        require(numTokens <= allowed [owner][msg.sender]);
        balances[owner]= balances [owner]- numTokens;
        allowed[owner][msg.sender] = allowed [owner][msg.sender] - numTokens;
        balances[buyer] = balances[buyer] + numTokens;
        emit Transfer(owner,buyer,numTokens);
        return true;
    }

}
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