import { Fixed18 } from './fixed-18';
import { Codec } from '@polkadot/types/types';
/**
 * @name debitToStableCoin
 * @description transform debit to stable coin
 * @param {Fixed18} quantity - user loan debit quantity
 * @param {Fixed18} debitExchangeRate - loan debit exchange rate
 * @returns {Fixed18} return the stable coin quantity
 */
export declare function debitToStableCoin(quantity: Fixed18, debitExchangeRate: Fixed18): Fixed18;
/**
 * @name stableCoinToDebit
 * @description transform stable coin to debit
 * @param {Fixed18} amount - stable coin amount
 * @param {Fixed18} debitExchangeRate - loan debit exchange rate
 * @returns {Fixed18} return the debit quantity
 */
export declare function stableCoinToDebit(amount: Fixed18, debitExchangeRate: Fixed18): Fixed18;
/**
 * @name debitToUSD
 * @description transform debit to USD
 * @param {Fixed18} quantity - user loan debit quantity
 * @param {Fixed18} debitExchangeRate - loan debit exchange rate
 * @param {Fixed18} stableCoinPrice - stable coin price
 * @returns {Fixed18} return the debit amount denominated in USD
 */
export declare function debitToUSD(quantity: Fixed18, debitExchangeRate: Fixed18, stableCoinPrice: Fixed18): Fixed18;
/**
 * @name USDToDebit
 * @description transform USD to debit
 * @param {Fixed18} amount - USD amount
 * @param {Fixed18} debitExchangeRate - loan debit exchange rate
 * @param {Fixed18} stableCoinPrice - stable coin price
 * @returns {Fixed18} return the debit quantity
 */
export declare function USDToDebit(amount: Fixed18, debitExchangeRate: Fixed18, stableCoinPrice: Fixed18): Fixed18;
/**
 * @name collateralToUSD
 * @description transform collateral to USD
 * @param {Fixed18} quantity - collateral quantity
 * @param {Fixed18} collateralPrice - collateral price
 * @returns {Fixed18} return the collateral amount denominated in USD
 */
export declare function collateralToUSD(quantity: Fixed18, collateralPrice: Fixed18): Fixed18;
/**
 * @name USDToCollateral
 * @description transform USD to collateral
 * @param {Fixed18} amount - USD amount
 * @param {Fixed18} collateralPrice - collateral price
 * @returns {Fixed18} return the collateral quantity
 */
export declare function USDToCollateral(amount: Fixed18, collateralPrice: Fixed18): Fixed18;
/**
 * @name calcCollateralRatio
 * @description calculate collateral ratio. Equation: collateralRatio = collateralAmount / debitAmount
 * @param {Fixed18} collateralAmount - collateral amount (USD)
 * @param {Fixed18} debitAmount - debit amount (USD)
 * @returns {Fixed18} return collateral ratio
 */
export declare function calcCollateralRatio(collateralAmount: Fixed18, debitAmount: Fixed18): Fixed18;
/**
 * @name calcStableFeeAPR
 * @description calculate stable fee annual percentage rate. Equation: stableFee = (1 + stableFee) ** (yearSecond * 1000 / expectedBlockTime) - 1
 * @param {Fixed18} stableFee - loan stable fee on the chain config
 * @param {number} expectedBlockTime - expected block time on the chain config (precision in milliseconds)
 * @return {Fixed18} return stable fee annual percentage rate
 */
export declare function calcStableFeeAPR(stableFee: Fixed18, blockTime: number): Fixed18;
/**
 * @name calcRequiredCollateral
 * @description calculate how many collateral needs. Equation: requiredColalteral = debitAmount * requiredCollateralRatio / collateralPrice
 * the function always returns a nonnegative number
 * @param {Fixed18} debitAmount - debit amount (USD)
 * @param {Fixed18} requiredCollateralRatio - required collateral ratio
 * @param {Fixed18} collateralPrice - collateral price
 * @returns {Fixed18} return the collateral quantity which is required
 */
export declare function calcRequiredCollateral(debitAmount: Fixed18, requiredCollateralRatio: Fixed18, collateralPrice: Fixed18): Fixed18;
/**
 * @name calcLiquidationPrice
 * @description calculate liquidation price. Equation: liquidatioPrice = debitAmount * liquidatioRatio / collateralQuantity
 * the function always returns a positive number or NaN
 * @param {Fixed18} collateralQuantity - collateral quantity
 * @param {Fixed18} debitAmount - debit amount (USD)
 * @param {Fixed18} liquidationRatio - required liquidation ratio on the chain config
 * @returns {Fixed18} return liquidation price
 */
export declare function calcLiquidationPrice(collateralQuantity: Fixed18, debitAmount: Fixed18, liquidationRatio: Fixed18): Fixed18;
/**
 * @name calcCanGenerate
 * @description calculate how many stable coins can generate. Equation: canGenerate = (collateralAmount / requiredCollateralRatio - currentDebitAmount) / stableCoinPrice
 * the function always returns a nonnegative number
 * @param {Fixed18} collateralAmount - collateral amount (USD)
 * @param {Fixed18} currentDebitAmount - current debit amount in the loan (USD)
 * @param {Fixed18} requiredCollateralRatio - loan required collateral ratio on the chain config
 * @param {Fixed18} stableCoinPrice - stable coin price
 * @param {Fixed18} [slippage=0] - slippage amount, because canGenerate amount is reduce every block time.
 * @returns {Fixed18} return stable coin quantity which can be generated
 */
export declare function calcCanGenerate(collateralAmount: Fixed18, currentDebitAmount: Fixed18, requiredCollateralRatio: Fixed18, stableCoinPrice: Fixed18, slippage?: Fixed18): Fixed18;
interface LoanParams {
    debits: Fixed18 | Codec;
    collaterals: Fixed18 | Codec;
    requiredCollateralRatio: Fixed18 | Codec;
    stableFee: Fixed18 | Codec;
    globalStableFee: Fixed18 | Codec;
    expectedBlockTime: number;
    liquidationRatio: Fixed18 | Codec;
    collateralPrice: Fixed18 | Codec;
    stableCoinPrice: Fixed18 | Codec;
    debitExchangeRate: Fixed18 | Codec;
}
/**
 * @class LoanHelper
 * @classdesc support more structured api, include loan properties and derived properties
 */
export declare class LoanHelper {
    debits: Fixed18;
    collaterals: Fixed18;
    requiredCollateralRatio: Fixed18;
    stableFee: Fixed18;
    globalStableFee: Fixed18;
    expectedBlockTime: number;
    liquidationRatio: Fixed18;
    collateralPrice: Fixed18;
    stableCoinPrice: Fixed18;
    debitExchangeRate: Fixed18;
    constructor(params: LoanParams);
    /**
     * @property {Fixed18} debitAmount
     */
    get debitAmount(): Fixed18;
    /**
     * @property {Fixed18} collateralAmount
     */
    get collateralAmount(): Fixed18;
    /**
     * @property {Fixed18} collateralRatio
     */
    get collateralRatio(): Fixed18;
    /**
     * @property {Fixed18} requiredCollateral
     */
    get requiredCollateral(): Fixed18;
    /**
     * @property {Fixed18} stableFeAPR
     */
    get stableFeeAPR(): Fixed18;
    /**
     * @property {Fixed18} liquidationPrice
     */
    get liquidationPrice(): Fixed18;
    /**
     * @property {Fixed18} canGenerate
     */
    get canGenerate(): Fixed18;
    /**
     * @property {Fixed18} canPayback
     */
    get canPayBack(): Fixed18;
}
export {};