import { keyframes } from '@vanilla-extract/css';

/**
 * Deep Space overlay keyframes. Everything here animates ONLY transform/opacity
 * so the compositor can run it cheaply. The `keyframes()` helper returns the
 * generated class name string, which the component splices into inline
 * `animation` shorthands.
 */

/** Cosmos breathe: the whole nebula backdrop drifts and dims almost imperceptibly. */
export const animCosmosDrift = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0) scale(1)', opacity: '0.9' },
  '50%': { transform: 'translate3d(-1.5%, 1%, 0) scale(1.04)', opacity: '1' },
  '100%': { transform: 'translate3d(0, 0, 0) scale(1)', opacity: '0.9' },
});

/** Nebula cloud drift: a single blurred cloud floats slowly across its layer. */
export const animNebulaA = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0) scale(1)' },
  '50%': { transform: 'translate3d(4%, -3%, 0) scale(1.08)' },
  '100%': { transform: 'translate3d(0, 0, 0) scale(1)' },
});

export const animNebulaB = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0) scale(1.05)' },
  '50%': { transform: 'translate3d(-5%, 2.5%, 0) scale(1)' },
  '100%': { transform: 'translate3d(0, 0, 0) scale(1.05)' },
});

/** Galaxy spiral: an exceptionally slow rotation of a distant pinwheel. */
export const animGalaxySpin = keyframes({
  '0%': { transform: 'rotate(0deg) scale(1)' },
  '50%': { transform: 'rotate(180deg) scale(1.03)' },
  '100%': { transform: 'rotate(360deg) scale(1)' },
});

/** Tiny star twinkle: gentle opacity + micro-scale pulse. */
export const animTwinkle = keyframes({
  '0%': { transform: 'scale(0.85)', opacity: '0.35' },
  '50%': { transform: 'scale(1)', opacity: '1' },
  '100%': { transform: 'scale(0.85)', opacity: '0.35' },
});

/** Bright star pulse: a slower, fuller bloom for the few hero stars. */
export const animStarPulse = keyframes({
  '0%': { transform: 'scale(0.8) rotate(0deg)', opacity: '0.55' },
  '50%': { transform: 'scale(1.15) rotate(45deg)', opacity: '1' },
  '100%': { transform: 'scale(0.8) rotate(0deg)', opacity: '0.55' },
});

/** Parallax depth: a star layer drifts as if the viewer is gliding through space. */
export const animParallaxNear = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0)' },
  '100%': { transform: 'translate3d(-3%, 1.5%, 0)' },
});

export const animParallaxFar = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0)' },
  '100%': { transform: 'translate3d(-1.2%, 0.6%, 0)' },
});

/**
 * Comet streak: a thin meteor crosses the field on a diagonal, fading in then
 * out. The element is rotated by the component; this only translates along its
 * own local X axis (its length direction) and fades.
 */
export const animComet = keyframes({
  '0%': { transform: 'translate3d(0, 0, 0)', opacity: '0' },
  '6%': { opacity: '1' },
  '40%': { opacity: '0.9' },
  '60%': { transform: 'translate3d(150%, 0, 0)', opacity: '0' },
  '100%': { transform: 'translate3d(150%, 0, 0)', opacity: '0' },
});