import type { FishMarineLife } from "../../domain/models/OceanModels.js";
import type { SpineChain } from "../../physics/SpineChain.js";
/**
 * Contract for spine chain physics management
 *
 * Handles organic swimming animation via spine chains -
 * initialization, physics updates, and joint synchronization.
 */
export interface IFishSpineController {
    /**
     * Initialize spine chain for a fish
     * Sets up spine joints and attaches to fish entity
     */
    initializeSpineChain(fish: FishMarineLife): void;
    /**
     * Update propulsion based on tail physics
     * Should be called BEFORE movement to update fish.speed based on thrust
     * @param fish - The fish entity
     * @param deltaSeconds - Time since last frame in seconds
     */
    updatePropulsion(fish: FishMarineLife, deltaSeconds: number): void;
    /**
     * Update spine chain physics for organic swimming
     */
    updateSpineChain(fish: FishMarineLife, deltaSeconds: number, frameMultiplier: number): void;
    /**
     * Get the spine chain for a fish (for external access)
     */
    getSpineChain(fish: FishMarineLife): SpineChain | undefined;
    /**
     * Remove spine chain reference when fish is removed
     */
    removeSpineChain(fish: FishMarineLife): void;
    /**
     * Reposition a fish's spine chain by a delta
     * Call after manually moving a fish's position
     */
    repositionSpineChain(fish: FishMarineLife, dx: number, dy: number): void;
}
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