/**
 * Cursor click ripples / סמן עם גלי קליק  (student motion library, id "cur-click-ripple")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibCurClickRipple" component={CurClickRipple} width={1920} height={1080} fps={30}
 *     durationInFrames={108} defaultProps={clickRippleDefaults} />
 * Render transparent: npx remotion render src/index.ts LibCurClickRipple out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as clickRippleDefaults). 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

/**
 * Click ripples: a cursor glides along a soft curve (with a faint motion trail), stops on three spots and clicks each
 * one: the pointer dips, a dot flashes, two rings ripple out and a numbered step badge pops beside the spot. Lay it
 * over a screen recording and move the points onto the buttons you talk about. 3.6 s.
 * Inspired by "Cursor" (Jitter, Luc Chaissac) and cursor-click packs (LottieFiles), redesigned: a curved path with a
 * trail and double rings, points as props.
 */
export type ClickRippleProps = Base & {
  points: [number, number][]; // click spots, design px inside a 760 x 560 box
  accent: string;
  cursorFill: string;
  trail: boolean;
  numbers: boolean; // a numbered step badge stays on every clicked spot
};
export const clickRippleDefaults: ClickRippleProps = {
  duration: 3.6,
  side: 'right',
  points: [
    [200, 170],
    [560, 260],
    [330, 430],
  ],
  accent: '#3B82F6',
  cursorFill: '#111111',
  trail: true,
  numbers: true,
};

const W = 760;
const H = 560;
const HOP = 0.5; // seconds per move
const REST = 0.15; // pause before the click

export const CurClickRipple: React.FC<ClickRippleProps> = (props) => {
  const p = {...clickRippleDefaults, ...props};
  const t = useT();
  const total = p.duration!;
  const start: [number, number] = [W + 80, H + 120];
  const end: [number, number] = [W + 60, -60];
  const way = [start, ...p.points, end];
  const tArrive = (i: number) => 0.15 + i * (HOP + REST + 0.05); // arrival at way[i]
  const pos = (s: number): [number, number] => {
    for (let i = 1; i < way.length; i++) {
      const a = tArrive(i) - HOP;
      if (s < a) return way[i - 1];
      if (s <= tArrive(i)) {
        const k = inOut(p01(s, a, tArrive(i)));
        const [x0, y0] = way[i - 1];
        const [x1, y1] = way[i];
        const bow = Math.sin(k * Math.PI) * 0.18; // a soft curve, not a straight line
        return [lerp(x0, x1, k) - (y1 - y0) * bow, lerp(y0, y1, k) + (x1 - x0) * bow];
      }
    }
    return way[way.length - 1];
  };
  const clicks = p.points.map((_, i) => tArrive(i + 1) + REST * 0.6);
  const press = Math.max(0, ...clicks.map((c) => p01(t, c - 0.06, c) * (1 - p01(t, c + 0.05, c + 0.18))));
  const [cx, cy] = pos(t);
  const fade = p01(t, 0, 0.25) * (1 - p01(t, total - 0.3, total - 0.04));
  return (
    <Stage p={p} w={W} h={H} defSide="right">
      <div style={{position: 'absolute', inset: 0, opacity: fade}}>
        {p.points.map(([x, y], i) => {
          const c = clicks[i];
          const k1 = p01(t, c, c + 0.55);
          const k2 = p01(t, c + 0.12, c + 0.7);
          const dot = p01(t, c - 0.02, c + 0.05) * (1 - p01(t, c + 0.15, c + 0.45));
          return (
            <React.Fragment key={i}>
              {[k1, k2].map((k, j) =>
                k > 0 && k < 1 ? (
                  <div key={j} style={{position: 'absolute', left: x - 70, top: y - 70, width: 140, height: 140, borderRadius: 140, border: `${lerp(8, 1, k)}px solid ${rgba(p.accent, 1 - k)}`,
                    transform: `scale(${lerp(0.2, 1, outE(k))})`, boxSizing: 'border-box'}} />
                ) : null,
              )}
              {dot > 0 && <div style={{position: 'absolute', left: x - 22, top: y - 22, width: 44, height: 44, borderRadius: 44, background: rgba(p.accent, 0.45 * dot)}} />}
              {p.numbers && t > c && (
                <div style={{position: 'absolute', left: x - 74, top: y - 74, width: 54, height: 54, borderRadius: 54, background: p.accent, color: '#fff', border: '4px solid #fff',
                  boxShadow: '0 6px 16px rgba(0,0,0,0.25)', display: 'flex', alignItems: 'center', justifyContent: 'center', fontFamily: p.font ?? HEEBO, fontWeight: 900, fontSize: 28,
                  transform: `scale(${spr(t, c, 18, 8)})`}}>{i + 1}</div>
              )}
            </React.Fragment>
          );
        })}
        {p.trail &&
          [5, 4, 3, 2, 1].map((k) => {
            const [tx, ty] = pos(t - k * 0.025);
            const sp = Math.hypot(tx - cx, ty - cy);
            if (sp < 6) return null;
            return <div key={k} style={{position: 'absolute', inset: 0, opacity: 0.12 * (6 - k) / 5}}><Cursor x={tx} y={ty} size={1.8} fill={p.cursorFill} /></div>;
          })}
        <Cursor x={cx} y={cy} press={press} size={1.8} fill={p.cursorFill} />
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibCurClickRipple', component: CurClickRipple, defaults: clickRippleDefaults};