/**
 * Subscribe + bell / הרשמה ופעמון  (student motion library, id "soc-subscribe-bell")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibSocSubscribe" component={SocSubscribe} width={1920} height={1080} fps={30}
 *     durationInFrames={138} defaultProps={subscribeDefaults} />
 * Render transparent: npx remotion render src/index.ts LibSocSubscribe out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as subscribeDefaults). 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

/**
 * Subscribe: a channel row slides in, the cursor clicks "Subscribe", the button turns into "Subscribed", a bell pops
 * out beside it and rings (with sound-wave arcs) and a small toast confirms the notifications. 4.6 s.
 * Inspired by animated subscribe buttons (Jitter "YouTube Subscribe Button", LottieFiles subscribe packs),
 * redesigned: neutral channel card, black pill, a ringing bell + toast, no platform branding.
 */
export type SubscribeProps = Base & {
  channel: string;
  subs: string;
  avatar: string;
  button: string;
  done: string;
  toast: string;
  accent: string; // avatar ring + bell
  buttonColor: string;
};
export const subscribeDefaults: SubscribeProps = {
  duration: 4.6,
  side: 'right',
  channel: 'עורכים עם AI',
  subs: '24.8K מנויים',
  avatar: '✂️',
  button: 'הרשמה',
  done: 'נרשמת',
  toast: 'תקבלו התראה על כל סרטון חדש',
  accent: '#FFB020',
  buttonColor: '#16151a',
};

const W = 760;
const H = 170;

export const SocSubscribe: React.FC<SubscribeProps> = (props) => {
  const p = {...subscribeDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const rtl = dirOf(p.channel + p.button) === 'rtl';
  const CLICK = 1.55;
  const done = t >= CLICK;
  const press = p01(t, CLICK - 0.1, CLICK) * (1 - p01(t, CLICK + 0.05, CLICK + 0.2));
  const morph = outE(p01(t, CLICK, CLICK + 0.35));
  const bell = spr(t, CLICK + 0.2, 16, 8);
  const ring = t > CLICK + 0.3 ? Math.sin((t - CLICK - 0.3) * 26) * 22 * Math.exp(-(t - CLICK - 0.3) * 3.2) : 0;
  const waves = p01(t, CLICK + 0.3, CLICK + 1.1);
  const toast = outE(p01(t, CLICK + 0.7, CLICK + 1.15));
  // the button sits at the far end of the row (left in RTL)
  const bw = lerp(210, 190, morph);
  const bx = rtl ? 34 + (done ? 96 : 0) * morph : W - 34 - bw - (done ? 96 : 0) * morph;
  const by = (H - 76) / 2;
  const bellX = rtl ? 34 : W - 34 - 80;
  const cin = inOut(p01(t, 0.55, 1.35));
  const cout = inOut(p01(t, 2.1, 2.7));
  const tx = rtl ? 34 + 105 : W - 34 - 105;
  const cx = lerp(lerp(rtl ? -80 : W + 80, tx, cin), tx + (rtl ? -40 : 40), cout);
  const cy = lerp(lerp(H + 200, by + 46, cin), H + 140, cout);
  return (
    <Stage p={p} w={W} h={H + 150} defSide="right">
      <div style={{position: 'absolute', inset: 0, ...lifeStyle(t, p.duration!), fontFamily: font, direction: rtl ? 'rtl' : 'ltr'}}>
        <div style={{position: 'absolute', left: 0, top: 0, width: W, height: H, borderRadius: H / 2, background: '#fff', boxShadow: SHADOW}} />
        <div style={{position: 'absolute', top: 20, [rtl ? 'right' : 'left']: 22, width: 130, height: 130, borderRadius: 130, padding: 6, boxSizing: 'border-box',
          background: `conic-gradient(${p.accent}, ${rgba(p.accent, 0.4)}, ${p.accent})`}}>
          <div style={{width: '100%', height: '100%', borderRadius: 130, background: '#1e1d24', display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 56}}>{p.avatar}</div>
        </div>
        <div style={{position: 'absolute', top: 38, [rtl ? 'right' : 'left']: 178}}>
          <div style={{fontSize: 38, fontWeight: 800, color: '#16151a', lineHeight: 1.2}}>{p.channel}</div>
          <div style={{fontSize: 26, color: 'rgba(22,21,26,0.5)', lineHeight: 1.3}}>{p.subs}</div>
        </div>
        {/* button */}
        <div style={{position: 'absolute', left: bx, top: by, width: bw, height: 76, borderRadius: 76, transform: `scale(${1 - 0.07 * press})`,
          background: done ? rgba('#16151a', lerp(1, 0.08, morph)) : p.buttonColor, color: done && morph > 0.5 ? '#16151a' : '#fff',
          display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 32, fontWeight: 800}}>
          {done && morph > 0.5 ? p.done : p.button}
        </div>
        {/* bell */}
        {done && (
          <div style={{position: 'absolute', left: bellX, top: by - 2, width: 80, height: 80, transform: `scale(${bell})`}}>
            <svg viewBox="0 0 48 48" width={80} height={80} style={{overflow: 'visible'}}>
              {[0, 1].map((k) => (
                <g key={k} opacity={(1 - waves) * (waves > 0 ? 1 : 0)}>
                  <path d={`M${8 - k * 6 - waves * 4} ${16 - k * 2} q ${-4 - k * 2} 8 0 ${16 + k * 4}`} fill="none" stroke={p.accent} strokeWidth={3} strokeLinecap="round" />
                  <path d={`M${40 + k * 6 + waves * 4} ${16 - k * 2} q ${4 + k * 2} 8 0 ${16 + k * 4}`} fill="none" stroke={p.accent} strokeWidth={3} strokeLinecap="round" />
                </g>
              ))}
              <g transform={`rotate(${ring} 24 8)`}>
                <path d="M24 6c-6.5 0-11 5-11 11v8l-4 6h30l-4-6v-8c0-6-4.5-11-11-11z" fill={p.accent} />
                <path d="M19.5 34a4.5 4.5 0 0 0 9 0" fill={p.accent} />
                <path d="M17 15c1-3 3.5-4.5 6-5" fill="none" stroke="rgba(255,255,255,0.7)" strokeWidth={2.2} strokeLinecap="round" />
              </g>
            </svg>
          </div>
        )}
        {/* toast */}
        <div style={{position: 'absolute', top: H + 26, left: 0, right: 0, display: 'flex', justifyContent: 'center', opacity: toast, transform: `translateY(${(1 - toast) * -24}px)`}}>
          <div style={{padding: '18px 30px', borderRadius: 60, background: 'rgba(22,21,26,0.86)', color: '#fff', fontSize: 28, fontWeight: 500, display: 'flex', gap: 12, alignItems: 'center'}}>
            <span>🔔</span>
            <span>{p.toast}</span>
          </div>
        </div>
        {cin > 0 && cout < 1 && <Cursor x={cx} y={cy} press={press} />}
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibSocSubscribe', component: SocSubscribe, defaults: subscribeDefaults};