import type { FishMarineLife } from "../../domain/models/OceanModels.js";
/**
 * IFishPropulsionCalculator - Calculates forward thrust from tail motion
 *
 * Real fish propulsion comes from the tail sweeping laterally through water.
 * Thrust peaks when the tail crosses the center line (fastest lateral velocity).
 * This creates a natural connection between tail animation and actual movement.
 */
export interface IFishPropulsionCalculator {
    /**
     * Calculate instantaneous forward thrust from tail oscillation
     * @param fish - The fish entity with swim phase and tail parameters
     * @returns Thrust multiplier (0-1+) to apply to base speed
     */
    calculateThrust(fish: FishMarineLife): number;
    /**
     * Calculate the target speed based on current swim intensity
     * Combines base speed with thrust from tail motion
     * @param fish - The fish entity
     * @returns Target speed in pixels/second
     */
    calculateTargetSpeed(fish: FishMarineLife): number;
    /**
     * Get instantaneous tail velocity for physics calculations
     * @param fish - The fish entity
     * @returns Object with lateral and angular velocity components
     */
    getTailVelocity(fish: FishMarineLife): {
        lateral: number;
        angular: number;
    };
}
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