/**
 * Like burst + counter / לייק עם פיצוץ לבבות  (student motion library, id "ui-like-burst")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibUiLike" component={UiLike} width={1920} height={1080} fps={30}
 *     durationInFrames={108} defaultProps={likeDefaults} />
 * Render transparent: npx remotion render src/index.ts LibUiLike out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as likeDefaults). A vertical video: width 1080, height 1920.
 */
// ---------------------------------------------------------------- helpers (shared by every library scene)
// Conventions: 1920x1080, 30 fps, transparent background. Sizes follow the frame's short side, so 1080x1920 works too.
// Common props: duration (s), side 'right' | 'left' | 'center', x / y (centre in % of the frame, override side),
// scale, font (a CSS font-family; default Heebo). Time is in seconds; the first and last frames are empty.
import React from 'react';
import {AbsoluteFill, Easing, useCurrentFrame, useVideoConfig} from 'remotion';
import {loadFont as loadHeebo} from '@remotion/google-fonts/Heebo';


const heebo = loadHeebo('normal', {weights: ['400', '500', '700', '800', '900'], subsets: ['hebrew', 'latin']});
/** Hebrew + Latin font (Google "Heebo"). props.font overrides it per scene. */
export const HEEBO = `${heebo.fontFamily}, "Helvetica Neue", Arial, sans-serif`;
export const MONO = 'ui-monospace, "SF Mono", Menlo, Consolas, monospace';

export type Side = 'right' | 'left' | 'center';
export type Base = {duration?: number; side?: Side; x?: number; y?: number; scale?: number; font?: string};

export const clamp01 = (x: number) => Math.min(1, Math.max(0, x));
/** 0..1 progress of t between a and b (seconds) */
export const p01 = (t: number, a: number, b: number) => clamp01((t - a) / (b - a));
export const lerp = (a: number, b: number, k: number) => a + (b - a) * k;
export const outE = Easing.bezier(0.16, 1, 0.3, 1); // fast out, long settle
export const inOut = Easing.bezier(0.65, 0, 0.35, 1);
export const inE = Easing.bezier(0.55, 0, 0.9, 0.45);
export const backOut = (x: number, s = 1.7) => (x <= 0 ? 0 : x >= 1 ? 1 : 1 + (s + 1) * Math.pow(x - 1, 3) + s * Math.pow(x - 1, 2));
/** Damped spring 0 -> 1 starting at t0 (closed form, so any frame computes on its own). */
export const spr = (t: number, t0: number, freq = 16, damp = 9) => {
  const x = t - t0;
  return x <= 0 ? 0 : 1 - Math.exp(-damp * x) * Math.cos(freq * x);
};
/** Deterministic pseudo random 0..1 */
export const rnd = (i: number, seed = 1) => {
  const v = Math.sin(i * 127.1 + seed * 311.7) * 43758.5453;
  return v - Math.floor(v);
};
export const isHe = (s: string) => /[֐-׿]/.test(s);
export const dirOf = (s: string): 'rtl' | 'ltr' => (isHe(s) ? 'rtl' : 'ltr');
/** "#a1b2c3" / "#abc" + alpha -> rgba() */
export const rgba = (hex: string, a = 1) => {
  let h = hex.replace('#', '');
  if (h.length === 3) h = h.split('').map((ch) => ch + ch).join('');
  const n = parseInt(h.slice(0, 6), 16);
  return `rgba(${(n >> 16) & 255},${(n >> 8) & 255},${n & 255},${a})`;
};
export const useT = () => {
  const f = useCurrentFrame();
  const {fps} = useVideoConfig();
  return f / fps;
};
/** 12345 -> "12,345" */
export const fmt = (n: number, sep = ',') => Math.round(n).toString().replace(/\B(?=(\d{3})+(?!\d))/g, sep);

/** Arrive (scale up out of a blur) and leave (shrink into a blur) for a whole group. */
export const life = (t: number, total: number, inDur = 0.45, outDur = 0.35) => {
  const a = p01(t, 0, inDur);
  const z = inOut(p01(t, total - outDur, total));
  return {
    opacity: clamp01(a * 2.2) * (1 - z),
    scale: lerp(0.82, 1, backOut(a, 1.4)) * (1 - 0.08 * z),
    blur: (1 - outE(a)) * 12 + z * 10,
    style: {} as React.CSSProperties,
  };
};
export const lifeStyle = (t: number, total: number, inDur = 0.45, outDur = 0.35): React.CSSProperties => {
  const l = life(t, total, inDur, outDur);
  return {opacity: l.opacity, transform: `scale(${l.scale})`, filter: l.blur > 0.2 ? `blur(${l.blur}px)` : undefined};
};

/**
 * Places a w x h box (design pixels of a 1080-high frame) on its side of the frame and scales it with the frame's
 * short side and props.scale. Children are positioned inside the box.
 */
export const Stage: React.FC<{p: Base; w: number; h: number; children: React.ReactNode; style?: React.CSSProperties; defSide?: Side}> = ({p, w, h, children, style, defSide = 'center'}) => {
  const {width: W, height: H} = useVideoConfig();
  const u = (Math.min(W, H) / 1080) * (p.scale ?? 1);
  const side = p.side ?? defSide;
  const cx = ((p.x ?? (side === 'right' ? 73 : side === 'left' ? 27 : 50)) / 100) * W;
  const cy = ((p.y ?? 50) / 100) * H;
  return (
    <AbsoluteFill style={{pointerEvents: 'none'}}>
      <div style={{position: 'absolute', left: cx - w / 2, top: cy - h / 2, width: w, height: h, transform: `scale(${u})`, transformOrigin: '50% 50%', ...style}}>
        {children}
      </div>
    </AbsoluteFill>
  );
};

/** Soft two-layer drop shadow for cards on any footage */
export const SHADOW = '0 22px 48px rgba(12,12,20,0.22), 0 4px 12px rgba(12,12,20,0.14)';

/** The classic arrow cursor; (x, y) = its tip; press 0..1 = mouse down. */
export const Cursor: React.FC<{x: number; y: number; press?: number; size?: number; fill?: string; stroke?: string}> = ({x, y, press = 0, size = 1.6, fill = '#111', stroke = '#fff'}) => {
  const s = size * (1 - 0.12 * press);
  return (
    <svg viewBox="-2 -2 17 25" width={17 * s * 1.35} height={25 * s * 1.35} style={{position: 'absolute', left: x - 2.7 * s, top: y - 2.7 * s, overflow: 'visible', filter: 'drop-shadow(0 3px 4px rgba(0,0,0,0.35))'}}>
      <path d="M0 0 L0 17.4 L4 13.7 L6.9 20.4 L9.6 19.2 L6.8 12.8 L12.4 12.8 Z" fill={fill} stroke={stroke} strokeWidth={1.1} strokeLinejoin="round" />
    </svg>
  );
};

/** A four-point sparkle centred on (0,0) in a -50..50 box. */
export const SPARK_PATH = 'M0 -50 C 6 -14 14 -6 50 0 C 14 6 6 14 0 50 C -6 14 -14 6 -50 0 C -14 -6 -6 -14 0 -50 Z';
export const Spark: React.FC<{x: number; y: number; size: number; color: string; rotate?: number; opacity?: number; glow?: boolean}> = ({x, y, size, color, rotate = 0, opacity = 1, glow = false}) => (
  <svg viewBox="-50 -50 100 100" width={size} height={size} style={{position: 'absolute', left: x - size / 2, top: y - size / 2, transform: `rotate(${rotate}deg)`, opacity, overflow: 'visible', filter: glow ? `drop-shadow(0 0 ${size * 0.15}px ${color})` : undefined}}>
    <path d={SPARK_PATH} fill={color} />
  </svg>
);
// ---------------------------------------------------------------- the scene

/**
 * Like chip: a finger taps the heart, it squashes and pops full, a ring and a burst of dots + mini hearts fly out, the
 * counter rolls up by one, then a few hearts float up like live reactions. 3.6 s.
 * Inspired by "like" button bursts (LottieFiles / Dribbble), redesigned: a reaction chip with an odometer + live hearts.
 */
export type LikeProps = Base & {
  count: number;
  heart: string; // the full heart colour
  burst: string[]; // particle colours
  chip: string; // chip background
  ink: string; // number colour
};
export const likeDefaults: LikeProps = {
  duration: 3.6,
  side: 'right',
  count: 2481,
  heart: '#FF3B6B',
  burst: ['#FFB020', '#7C5CFF', '#22C3A6', '#FF3B6B'],
  chip: '#ffffff',
  ink: '#16151a',
};

const HEART = 'M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z';
const Heart: React.FC<{size: number; fill: string; stroke?: string; sw?: number}> = ({size, fill, stroke = 'none', sw = 0}) => (
  <svg viewBox="0 0 24 24" width={size} height={size} style={{overflow: 'visible', display: 'block'}}>
    <path d={HEART} fill={fill} stroke={stroke} strokeWidth={sw} strokeLinejoin="round" />
  </svg>
);

/** digits of a number; changed digits roll up from the old to the new one */
const Roll: React.FC<{from: number; to: number; k: number; size: number; color: string; font: string}> = ({from, to, k, size, color, font}) => {
  const a = from.toLocaleString('en-US');
  const b = to.toLocaleString('en-US').padStart(a.length, ' ');
  const A = a.padStart(b.length, ' ');
  const h = size * 1.15;
  return (
    <div style={{display: 'flex', direction: 'ltr', fontFamily: font, fontWeight: 800, fontSize: size, color, fontVariantNumeric: 'tabular-nums', lineHeight: `${h}px`}}>
      {b.split('').map((ch, i) => {
        const same = ch === A[i];
        return (
          <div key={i} style={{height: h, overflow: 'hidden', position: 'relative', width: ch === ',' ? size * 0.3 : size * 0.6, textAlign: 'center'}}>
            {same ? (
              <div>{ch}</div>
            ) : (
              <div style={{transform: `translateY(${-k * h}px)`}}>
                <div>{A[i]}</div>
                <div>{ch}</div>
              </div>
            )}
          </div>
        );
      })}
    </div>
  );
};

export const UiLike: React.FC<LikeProps> = (props) => {
  const p = {...likeDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const TAP = 1.0;
  const W = 420;
  const H = 150;
  const hx = 95; // heart centre in the chip
  const hy = H / 2;
  const liked = t >= TAP;
  const squash = t < TAP ? 1 - 0.22 * p01(t, TAP - 0.18, TAP) : lerp(0.78, 1, spr(t, TAP, 18, 7));
  const ring = p01(t, TAP, TAP + 0.45);
  const roll = outE(p01(t, TAP + 0.05, TAP + 0.5));
  const touch = p01(t, TAP - 0.3, TAP - 0.12) * (1 - p01(t, TAP + 0.05, TAP + 0.3));
  return (
    <Stage p={p} w={W} h={H + 360} defSide="right">
      <div style={{position: 'absolute', inset: 0, ...lifeStyle(t, p.duration!)}}>
        {/* live hearts floating up */}
        {Array.from({length: 7}, (_, i) => {
          const t0 = TAP + 0.45 + i * 0.17;
          const k = p01(t, t0, t0 + 1.3);
          if (k <= 0 || k >= 1) return null;
          const sz = 34 + rnd(i, 2) * 26;
          const x = hx + Math.sin(k * 5 + i) * (18 + rnd(i, 4) * 20) + (rnd(i, 6) - 0.5) * 40;
          const y = 360 + hy - k * 330;
          const c = i % 3 === 1 ? p.burst[1 % p.burst.length] : p.heart;
          return (
            <div key={i} style={{position: 'absolute', left: x - sz / 2, top: y - sz / 2, opacity: Math.min(1, k * 6) * (1 - p01(k, 0.6, 1)), transform: `scale(${0.4 + 0.6 * outE(Math.min(1, k * 4))}) rotate(${(rnd(i, 8) - 0.5) * 30}deg)`}}>
              <Heart size={sz} fill={c} />
            </div>
          );
        })}
        {/* the chip */}
        <div style={{position: 'absolute', left: 0, top: 360, width: W, height: H, borderRadius: H / 2, background: p.chip, boxShadow: SHADOW}}>
          <div style={{position: 'absolute', left: 175, top: 0, height: H, display: 'flex', alignItems: 'center'}}>
            <Roll from={p.count} to={p.count + 1} k={roll} size={64} color={p.ink} font={font} />
          </div>
        </div>
        <div style={{position: 'absolute', left: 0, top: 360, width: W, height: H}}>
          {/* ring */}
          {liked && ring < 1 && (
            <div style={{position: 'absolute', left: hx - 95, top: hy - 95, width: 190, height: 190, borderRadius: 200,
              border: `${lerp(26, 0, ring)}px solid ${rgba(p.burst[0], 1 - ring * 0.3)}`, boxSizing: 'border-box', transform: `scale(${lerp(0.3, 1, outE(ring))})`}} />
          )}
          {/* particles */}
          {liked &&
            Array.from({length: 12}, (_, i) => {
              const a = (i / 12) * Math.PI * 2 + 0.2;
              const k = outE(p01(t, TAP + 0.04, TAP + 0.75));
              const r = lerp(40, 118 + rnd(i, 3) * 26, k);
              const s = (i % 2 ? 16 : 24) * (1 - p01(t, TAP + 0.35, TAP + 0.8));
              const col = p.burst[i % p.burst.length];
              return i % 3 === 0 ? (
                <div key={i} style={{position: 'absolute', left: hx + Math.cos(a) * r - s * 0.6, top: hy + Math.sin(a) * r - s * 0.6}}>
                  <Heart size={s * 1.2} fill={col} />
                </div>
              ) : (
                <div key={i} style={{position: 'absolute', left: hx + Math.cos(a) * r - s / 2, top: hy + Math.sin(a) * r - s / 2, width: s, height: s, borderRadius: s, background: col}} />
              );
            })}
          {/* the heart */}
          <div style={{position: 'absolute', left: hx - 42, top: hy - 42, transform: `scale(${squash})`}}>
            {liked ? <Heart size={84} fill={p.heart} /> : <Heart size={84} fill="none" stroke={rgba(p.ink, 0.75)} sw={2} />}
          </div>
          {/* the finger */}
          {touch > 0 && (
            <div style={{position: 'absolute', left: hx - 48, top: hy - 48, width: 96, height: 96, borderRadius: 96, background: rgba('#16151a', 0.16 * touch),
              border: `3px solid ${rgba('#16151a', 0.35 * touch)}`, boxShadow: `0 6px 18px rgba(0,0,0,${0.25 * touch})`, transform: `scale(${lerp(1.25, 0.85, p01(t, TAP - 0.3, TAP))})`}} />
          )}
        </div>
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibUiLike', component: UiLike, defaults: likeDefaults};