import { createPresenceComponent, motionTokens } from '@fluentui/react-motion';
import { fadeAtom, slideAtom } from '@fluentui/react-motion-components-preview';
import { POSITIONING_SLIDE_DIRECTION_VAR_X as slideDirectionVarX, POSITIONING_SLIDE_DIRECTION_VAR_Y as slideDirectionVarY } from '@fluentui/react-positioning';
// Shared timing constants for the enter animation.
const duration = motionTokens.durationSlower;
const easing = motionTokens.curveDecelerateMid;
/**
 * Default `surfaceMotion` slot for `<Popover>`.
 *
 * Enter-only animation combining a fade and a direction-aware slide.
 * The slide reads CSS variables set by `usePositioningSlideDirection` and scales
 * them by `distance` pixels. There is no exit animation; the surface unmounts immediately.
 *
 * @param distance - Travel distance (px) for the enter slide. Defaults to `10`.
 */ export const PopoverSurfaceMotion = createPresenceComponent(({ distance = 10 })=>({
        enter: [
            fadeAtom({
                duration,
                easing,
                direction: 'enter'
            }),
            {
                // slideAtom produces translate keyframes from `outX`/`outY` → `0px`.
                // The `outX`/`outY` values read the positioning-provided CSS variables and scale
                // them by `distance` so the surface slides in from the correct direction.
                ...slideAtom({
                    duration,
                    easing,
                    direction: 'enter',
                    outX: `calc(var(${slideDirectionVarX}, 0px) * ${distance})`,
                    outY: `calc(var(${slideDirectionVarY}, 0px) * ${distance})`
                }),
                // 'accumulate' compositing adds this effect's transform on top of the element's
                // existing transform, preserving any transform applied by the positioning engine.
                composite: 'accumulate'
            }
        ],
        // No exit animation — the surface unmounts immediately on close.
        exit: []
    }));