import { ChatBgVariants } from './types';
import { firefliesDrift } from './animFireflies.css';

// Fireflies — a warm summer-dusk meadow. A few soft golden-green motes drift over
// a deep base, each mote a bright core melting into a warm halo. Sparse by design
// so the reading column stays clear; the motion is a slow, gentle background-
// position PAN (see animFireflies.css.ts) that reads as fireflies wandering.
//
// Layer stacking order (topmost first — CSS paints image #1 on top):
//   1. large bright motes  — crisp warm core -> warm halo, sparse, largest step
//   2. medium motes        — dimmer, smaller, more of them
//   3. tiny far sparks     — faintest, smallest tile, calm distant layer
//   4. center vignette     — keeps the reading center the calmest area
//   5. warm dusk wash A    — ambient glow, upper
//   6. warm dusk wash B    — ambient glow, lower
// Mote tiles use coprime-ish sizes (227/293/179) so their repeats never line up
// and the field reads as scattered, not gridded.
//
// getChatBg STRIPS the `animation` for prefers-reduced-motion / pause, so the
// authored backgroundPosition already composes a finished, gorgeous still scene
// of glowing motes on its own — the animation only sets them gently adrift.
export const animFireflies: ChatBgVariants = {
  // Dark: warm gold-green glows on a deep forest-navy base with a soft vignette.
  // Cores sit near oklch(0.85 0.13 110); halos fall to a warm amber-green. All
  // opacities are kept low so message text stays crisp (WCAG-AA) over the field.
  dark: {
    backgroundColor: 'oklch(0.17 0.035 175)',
    backgroundImage: [
      // 1. large bright motes — golden-green core fading through a warm halo
      'radial-gradient(circle at center, oklch(0.85 0.13 110 / 0.55) 1.4px, oklch(0.72 0.14 95 / 0.16) 3px, transparent 6px)',
      // 2. medium motes — a touch cooler-green, dimmer, more numerous
      'radial-gradient(circle at center, oklch(0.82 0.13 128 / 0.40) 1.1px, oklch(0.70 0.12 110 / 0.12) 2.4px, transparent 5px)',
      // 3. tiny far sparks — faint warm pinpoints, the calm distant layer
      'radial-gradient(circle at center, oklch(0.88 0.11 100 / 0.28) 0.8px, transparent 2.4px)',
      // 4. center vignette — darkens the edges, keeps reading center calmest
      'radial-gradient(ellipse 125% 95% at 50% 44%, transparent 40%, oklch(0.10 0.03 175 / 0.55) 100%)',
      // 5. warm dusk wash A — a low amber-green glow drifting in from upper-right
      'radial-gradient(ellipse 140% 120% at 80% 10%, oklch(0.30 0.07 120 / 0.45) 0%, transparent 58%)',
      // 6. warm dusk wash B — deep teal-navy pooling into the lower-left
      'radial-gradient(ellipse 135% 115% at 16% 94%, oklch(0.22 0.05 190 / 0.50) 0%, transparent 60%)',
    ].join(','),
    backgroundSize: [
      '227px 227px', // large motes
      '293px 293px', // medium motes
      '179px 179px', // far sparks
      '100% 100%', // vignette
      '100% 100%', // wash A
      '100% 100%', // wash B
    ].join(','),
    backgroundPosition: [
      '0 0', // large  (matches firefliesDrift 0%)
      '83px 47px', // medium (offset breaks alignment)
      '131px 101px', // far    (offset again)
      '0 0', // vignette (static)
      '0 0', // wash A   (static)
      '0 0', // wash B   (static)
    ].join(','),
    animation: `${firefliesDrift} 44s linear infinite`,
  },

  // Light: a cozy warm dim-dusk. No harsh dots on white — soft amber motes with
  // gentle halos float on a warm blush->honey gradient. Contrast stays low so the
  // reading area is comfortable and text remains crisp (WCAG-AA).
  light: {
    backgroundColor: 'oklch(0.955 0.02 85)',
    backgroundImage: [
      // 1. large amber motes — warm honey core into a soft amber halo
      'radial-gradient(circle at center, oklch(0.80 0.11 80 / 0.30) 1.4px, oklch(0.85 0.09 70 / 0.12) 3px, transparent 6px)',
      // 2. medium motes — slightly greener-gold, softer
      'radial-gradient(circle at center, oklch(0.78 0.10 95 / 0.22) 1.1px, oklch(0.86 0.08 85 / 0.10) 2.4px, transparent 5px)',
      // 3. tiny far sparks — faint warm pinpoints for texture, never noise
      'radial-gradient(circle at center, oklch(0.75 0.10 75 / 0.16) 0.8px, transparent 2.4px)',
      // 4. center vignette — brightens the calm reading center a touch
      'radial-gradient(ellipse 125% 95% at 50% 44%, oklch(1 0 0 / 0.40) 30%, transparent 100%)',
      // 5. warm dusk wash A — honey glow from the upper-right
      'radial-gradient(ellipse 140% 120% at 80% 8%, oklch(0.92 0.06 85 / 0.55) 0%, transparent 60%)',
      // 6. warm dusk wash B — soft rose blush pooling lower-left
      'radial-gradient(ellipse 135% 115% at 15% 95%, oklch(0.93 0.05 40 / 0.45) 0%, transparent 62%)',
    ].join(','),
    backgroundSize: [
      '227px 227px', // large motes
      '293px 293px', // medium motes
      '179px 179px', // far sparks
      '100% 100%', // vignette
      '100% 100%', // wash A
      '100% 100%', // wash B
    ].join(','),
    backgroundPosition: [
      '0 0', // large  (matches firefliesDrift 0%)
      '83px 47px', // medium
      '131px 101px', // far
      '0 0', // vignette (static)
      '0 0', // wash A   (static)
      '0 0', // wash B   (static)
    ].join(','),
    animation: `${firefliesDrift} 44s linear infinite`,
  },
};