/**
 * Sentiment Engine — tracks buy/sell pressure via EMA and adjusts DBC fees.
 *
 * The engine computes a signed sentiment score in [-1e9, +1e9].
 * Bullish sentiment → lower fees (to incentivise more buying).
 * Bearish sentiment → higher fees (to slow down selling pressure).
 *
 * Fee adjustment is symmetric and bounded by sentimentFeeRangeBps.
 */
import type { Connection, PublicKey } from "@solana/web3.js";
import type { SentimentState, AdaptiveCurveConfig } from "../types/index.js";
export interface SentimentUpdate {
    recentBuyVolume: bigint;
    recentSellVolume: bigint;
    windowSlots: number;
}
export interface FeeAdjustment {
    baseFeeNumerator: bigint;
    adjustedFeeNumerator: bigint;
    sentimentScore: bigint;
    adjustmentBps: number;
}
/**
 * Apply sentiment score to compute an adjusted fee numerator.
 *
 * Logic:
 *   - score > 0 (bullish): reduce fee by up to sentimentFeeRangeBps
 *   - score < 0 (bearish): increase fee by up to sentimentFeeRangeBps
 *   - Linear interpolation within the range
 */
export declare function computeSentimentAdjustedFee(baseFeeNumerator: bigint, sentimentScore: bigint, sentimentFeeRangeBps: number, feeDenominator?: bigint): FeeAdjustment;
/**
 * Update EMA-based sentiment state with new buy/sell volumes.
 * Returns the updated state — caller should pass this to update_curve_sentiment.
 */
export declare function updateSentimentState(current: SentimentState, update: SentimentUpdate, currentSlot: bigint): {
    updatedState: SentimentState;
    feeAdjustment: FeeAdjustment;
    curveConfig: AdaptiveCurveConfig;
};
/**
 * Derive the sentiment state PDA and fetch on-chain data.
 */
export declare function fetchSentimentState(connection: Connection, dbcPool: PublicKey): Promise<SentimentState | null>;
/** Human-readable sentiment label */
export declare function sentimentLabel(score: bigint): string;
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