contract RateCalc is IRCD {
    using SafeMath for uint256;
     /**
     * @notice Calculates maximum option buyer profit
     * @param amount Option amount
     * @param maxAvailable the total pooled ETH unlocked and available to bet
     * @param oldPrice the previous price of the underlying
     * @param newPrice the current price of the underlying
     * @return profit total possible profit amount
     */
    function rate(uint256 amount, uint256 maxAvailable, uint256 oldPrice, uint256 newPrice) external view override returns (uint256)  {
        require(amount <= maxAvailable, "greater then pool funds available");
        
        uint256 oneTenth = amount.div(10);
        uint256 halfMax = maxAvailable.div(2);
        if (amount > halfMax) {
            return amount.mul(2).add(oneTenth).add(oneTenth);
        } else {
            if(oneTenth > 0) {
                return amount.mul(2).sub(oneTenth);
            } else {
                uint256 oneThird = amount.div(4);
                require(oneThird > 0, "invalid bet amount");
                return amount.mul(2).sub(oneThird);
            }
        }
        
    }
}
function rate(uint256 amount, uint256 maxAvailable, uint256 oldPrice, uint256 newPrice) external view override returns (uint256)  {
    require(amount <= maxAvailable, "greater then pool funds available");
        
    uint256 oneTenth = amount.div(10);
    uint256 halfMax = maxAvailable.div(2);
    if (amount > halfMax) {
        return amount.mul(2).add(oneTenth).add(oneTenth);
    } else {
        if(oneTenth > 0) {
            return amount.mul(2).sub(oneTenth);
        } else {
            uint256 oneThird = amount.div(4);
            require(oneThird > 0, "invalid bet amount");
            return amount.mul(2).sub(oneThird);
        }
    }
        
}

/**
 * @notice Calculates maximum option buyer profit
 * @param amount Option amount
 * @param maxAvailable the total pooled ETH unlocked and available to bet
 * @param oldPrice the previous price of the underlying
 * @param newPrice the current price of the underlying
 * @return profit total possible profit amount
 */