export type QuoteExactInputSingleParams = {
  tokenIn: string;
  tokenOut: string;
  amountIn: bigint;
  // Uniswap V3 only
  fee?: number;
  // Uniswap V3 only
  sqrtPriceLimitX96?: bigint | number;
  // Engine-specific extras (e.g., tickSpacing, deployer)
  extras?: Record<string, unknown>;
};

export type QuoteExactOutputSingleParams = {
  tokenIn: string;
  tokenOut: string;
  amountOut: bigint;
  // Uniswap V3 only
  fee?: number;
  // Uniswap V3 only
  sqrtPriceLimitX96?: bigint | number;
  extras?: Record<string, unknown>;
};

export type QuoteExactInputSingleResult = {
  amountOut: bigint;
  sqrtPriceX96After: bigint;
};

export type QuoteExactOutputSingleResult = {
  amountIn: bigint;
  sqrtPriceX96After: bigint;
};

export type PoolState = {
  sqrtPriceX96: bigint;
  tick?: number;
  // Add other common pool state fields if needed
};

export interface QuoteEngine {
  quoteExactInputSingle(
    params: QuoteExactInputSingleParams,
  ): Promise<QuoteExactInputSingleResult>;

  // Optional; not all engines may support this.
  quoteExactOutputSingle?(
    params: QuoteExactOutputSingleParams,
  ): Promise<QuoteExactOutputSingleResult>;

  // Optional; for getting current pool state without making a direct pool call
  getCurrentPoolState?(): Promise<PoolState>;
}