/**
 * Marker highlight / מרקר מדגיש  (student motion library, id "txt-highlight-marker")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibTxtHighlight" component={TxtHighlight} width={1920} height={1080} fps={30}
 *     durationInFrames={126} defaultProps={highlightDefaults} />
 * Render transparent: npx remotion render src/index.ts LibTxtHighlight out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as highlightDefaults). 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

/**
 * Marker highlight: a two-line sentence fades up, then a hand-drawn highlighter stroke sweeps behind the key phrase
 * (rough edges, a little tilt, a second thinner pass), and the phrase darkens as the marker passes. 4.2 s.
 * Inspired by animated text highlighting (CodePen: alvarotrigo, joeyhoer), redesigned: a rough marker in two passes.
 */
export type HighlightProps = Base & {
  lines: string[];
  mark: string; // the phrase to highlight (must appear in one line)
  color: string;
  marker: string;
  size: number;
};
export const highlightDefaults: HighlightProps = {
  duration: 4.2,
  side: 'center',
  lines: ['הסוד הוא לא הציוד,', 'הסוד הוא העריכה.'],
  mark: 'העריכה',
  color: '#16151a',
  marker: '#FFD43B',
  size: 104,
};

// a rough marker stroke in a 100 x 30 box (stretched to the phrase)
const STROKE = 'M2 9 C 20 5, 45 7, 70 4 S 95 5, 99 7 L 98 24 C 80 27, 55 23, 35 26 S 8 25, 1 27 Z';
const PASS2 = 'M4 21 C 25 19, 50 22, 72 19 S 92 20, 97 21 L 97 26 C 75 28, 50 26, 28 28 S 8 27, 4 27 Z';

export const TxtHighlight: React.FC<HighlightProps> = (props) => {
  const p = {...highlightDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const total = p.duration!;
  const rtl = dirOf(p.lines.join(' ')) === 'rtl';
  const sweep = inOut(p01(t, 1.15, 1.75));
  const sweep2 = inOut(p01(t, 1.6, 2.05));
  const out = inOut(p01(t, total - 0.45, total));
  const clip = (k: number) => (rtl ? `inset(-20% 0 -20% ${(1 - k) * 100}%)` : `inset(-20% ${(1 - k) * 100}% -20% 0)`);
  return (
    <Stage p={p} w={1600} h={p.lines.length * p.size * 1.35} defSide="center">
      <div style={{position: 'absolute', inset: 0, display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', fontFamily: font,
        opacity: 1 - out, transform: `translateY(${-out * 30}px)`, filter: out > 0.01 ? `blur(${out * 8}px)` : undefined}}>
        {p.lines.map((line, li) => {
          const a = outE(p01(t, 0.1 + li * 0.18, 0.75 + li * 0.18));
          const at = line.indexOf(p.mark);
          const parts = at >= 0 ? [line.slice(0, at), p.mark, line.slice(at + p.mark.length)] : [line, '', ''];
          return (
            <div key={li} style={{direction: rtl ? 'rtl' : 'ltr', fontSize: p.size, fontWeight: 800, color: p.color, lineHeight: 1.3, whiteSpace: 'nowrap',
              opacity: a, transform: `translateY(${lerp(40, 0, a)}px)`, filter: a < 0.99 ? `blur(${(1 - a) * 10}px)` : undefined}}>
              {parts[0]}
              {parts[1] && (
                <span style={{position: 'relative', display: 'inline-block'}}>
                  {[
                    [STROKE, sweep, 0.92],
                    [PASS2, sweep2, 0.85],
                  ].map(([d, k, al], j) => (
                    <svg key={j} viewBox="0 0 100 30" preserveAspectRatio="none" style={{position: 'absolute', left: '-6%', width: '112%', top: '4%', height: '80%', overflow: 'visible',
                      clipPath: clip(k as number), transform: `rotate(${rtl ? 1.2 : -1.2}deg)`, zIndex: 0}}>
                      <path d={d as string} fill={rgba(p.marker, al as number)} />
                    </svg>
                  ))}
                  <span style={{position: 'relative', zIndex: 1}}>{parts[1]}</span>
                </span>
              )}
              {parts[2]}
            </div>
          );
        })}
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibTxtHighlight', component: TxtHighlight, defaults: highlightDefaults};