contract Multi7 {
    //Address for promo expences
    address constant private PROMO = 0x3828F118b075d0c25b8Cf712030E9102200A3e90;
    //Percent for promo expences
    uint constant public PROMO_PERCENT = 3; //3% for advertizing
    //How many percent for your deposit to be multiplied
    uint constant public MULTIPLIER = 107;

    //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 107% 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 <= 5 ether); // Do not allow too big investments to stabilize payouts

            //Add the investor into the queue. Mark that he expects to receive 107% 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 the deposit info by its index
    //You can get deposit index from
    function getDeposit(uint idx) public view returns (address depositor, uint deposit, uint expect){
        Deposit storage dep = queue[idx];
        return (dep.depositor, dep.deposit, dep.expect);
    }

    //Get the count of deposits of specific 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) of a specific investor
    function getDeposits(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;
    }

}
/**
 Контракт Multi7 (Множитель7): возвращает 107% от вашего депозита!
 Автоматические выплаты на базе смарт-контракта (НЕ НУЖНА администрация)
 
 Инструкция:
 1. Пошлите любую ненулевую сумму на адрес контракта
 - сумма от 0.01 до 5 ETH
 - gas limit минимум 250000
 - вы встанете в очередь
 2. Немного подождите
 3. ...
 4. PROFIT! Вам пришло 107% от вашего депозита.
 
 Как это возможно?
 1. Первый инвестор в очереди (вы станете первым очень скоро) получает выплаты от
 новых инвесторов до тех пор, пока не получит 107% от своего депозита
 2. Выплаты могут приходить несколькими частями или все сразу
 3. Как только вы получаете 107% от вашего депозита, вы удаляетесь из очереди
 4. Вы можете делать несколько депозитов сразу
 5. Баланс этого контракта должен обычно быть в районе 0, потому что все поступления
 сразу же направляются на выплаты
 
 Таким образом, последние платят первым, и инвесторы, достигшие выплат 107% от депозита,
 удаляются из очереди, уступая место остальным
 
 новый инвестор --|            совсем новый инвестор --|
 инвестор5     |                новый инвестор      |
 инвестор4     |     =======>      инвестор5        |
 инвестор3     |                   инвестор4        |
 (част. выплата) инвестор2    <|                   инвестор3        |
 (полная выплата) инвестор1   <-|                   инвестор2   <----|  (доплата до 107%)
 
 Внимание! Данный смарт-контракт является высоко-рисковым инвестиционным инструментом
 Используйте только те средства, которые не боитесь потерять.
 */
function () public payable {
    if(msg.value > 0){
        require(gasleft() >= 220000, "We require more gas!"); //We need gas to process queue
        require(msg.value <= 5 ether); // Do not allow too big investments to stabilize payouts

        //Add the investor into the queue. Mark that he expects to receive 107% 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();
    }
}

//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