pragma solidity ^0.4.25;

/*
----- ETHERWATERFALL SMART-CONTRACT -----

You will get 119% of your deposit in a short period.

----- NO BACKDOOR - NO BUGS - PERFECT LOGIC - EFFICIENT PROMOTION -----



----- ETHERWATERFALL СМАРТ-КОНТРАКТ -----

Вы получите 119% от Вашего депозита за короткий период.

----- НИКАКИХ БЭКДОРОВ - НИКАКИХ БАГОВ - ПРЕВОСХОДНАЯ ЛОГИКА - ЭФФЕКТИВНОЕ ПРОДВИЖЕНИЕ -----
*/

contract EtherWaterfall {
    //Address for promo expenses
    address constant private PROMO = 0x014bF153476683dC0A0673325C07EB3342281DC8;
    //Percent for promo expenses
    uint constant public PROMO_PERCENT = 6; //5% for advertising and 1% for technical support
    //How many percent for your deposit will be multiplied
    uint constant public MULTIPLIER = 119;

    //The deposit structure holds all the info about the deposit made
    struct Deposit {
        address depositor; //The depositor address
        uint128 deposit;   //The deposit amount
        uint128 expect;    //How much we should pay out (initially it is 119% of deposit)
    }

    Deposit[] private queue;  //The queue
    uint public currentReceiverIndex = 0; //The index of the first depositor in the queue. The receiver of investments!

    //This function receives all the deposits
    //stores them and make immediate payouts
    function () public payable {
        if(msg.value > 0){
            require(gasleft() >= 220000, "We require more gas!"); //We need gas to process queue
            require(msg.value <= 13 ether); //Do not allow too big investments to stabilize payouts

            //Add the investor in queue. Mark him that he expects to receive 119% of deposit back
            queue.push(Deposit(msg.sender, uint128(msg.value), uint128(msg.value*MULTIPLIER/100)));

            //Send some promo to enable this contract to leave long-long time
            uint promo = msg.value*PROMO_PERCENT/100;
            PROMO.send(promo);

            //Pay to first investors in line
            pay();
        }
    }

    //Used to pay to current investors
    //Each new transaction processes 1 - 4+ investors in the head of queue 
    //depending on balance and gas left
    function pay() private {
        //Try to send all the money on contract to the first investors in line
        uint128 money = uint128(address(this).balance);

        //We will do cycle on the queue
        for(uint i=0; i<queue.length; i++){

            uint idx = currentReceiverIndex + i;  //get the index of the currently first investor

            Deposit storage dep = queue[idx]; //get the info of the first investor

            if(money >= dep.expect){  //If we have enough money on the contract to fully pay to investor
                dep.depositor.send(dep.expect); //Send money to him
                money -= dep.expect;            //update money left

                //this investor is fully paid, so remove him
                delete queue[idx];
            }else{
                //Here we don't have enough money so partially pay to investor
                dep.depositor.send(money); //Send to him everything we have
                dep.expect -= money;       //Update the expected amount
                break;                     //Exit cycle
            }

            if(gasleft() <= 50000)         //Check the gas left. If it is low, exit the cycle
                break;                     //The next investor will process the line further
        }

        currentReceiverIndex += i; //Update the index of the current first investor
    }

    //Get deposit info by it ID
    function getSingleDeposit(uint idx) public view returns (address depositor, uint deposit, uint expect){
        Deposit storage dep = queue[idx];
        return (dep.depositor, dep.deposit, dep.expect);
    }

    //Get count of deposits by certain investor
    function getDepositsCount(address depositor) public view returns (uint) {
        uint c = 0;
        for(uint i=currentReceiverIndex; i<queue.length; ++i){
            if(queue[i].depositor == depositor)
                c++;
        }
        return c;
    }

    //Get all deposits (index, deposit, expect) by certain investor
    function getAllDeposits(address depositor) public view returns (uint[] idxs, uint128[] deposits, uint128[] expects) {
        uint c = getDepositsCount(depositor);

        idxs = new uint[](c);
        deposits = new uint128[](c);
        expects = new uint128[](c);

        if(c > 0) {
            uint j = 0;
            for(uint i=currentReceiverIndex; i<queue.length; ++i){
                Deposit storage dep = queue[i];
                if(dep.depositor == depositor){
                    idxs[j] = i;
                    deposits[j] = dep.deposit;
                    expects[j] = dep.expect;
                    j++;
                }
            }
        }
    }
    
    //Get current queue size
    function getQueueLength() public view returns (uint) {
        return queue.length - currentReceiverIndex;
    }

}