/**
 * Profile + follower count / פרופיל ועוקבים שעולים  (student motion library, id "soc-follower-counter")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibSocFollow" component={SocFollow} width={1920} height={1080} fps={30}
 *     durationInFrames={138} defaultProps={followDefaults} />
 * Render transparent: npx remotion render src/index.ts LibSocFollow out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as followDefaults). 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

/**
 * Profile + followers: a profile card slides in, the followers number races up with "+1" chips popping off it, a
 * finger taps "Follow", the button flips to "Following" and a "10K" badge pops when the count crosses the goal. 4.6 s.
 * Inspired by milestone counters (Jitter "Counter: 1,000 installs", "Instagram Interactions"), redesigned: a profile
 * card with a live count and a follow tap.
 */
export type FollowProps = Base & {
  name: string;
  handle: string;
  avatar: string; // an emoji or a letter
  from: number;
  to: number;
  badge: string;
  labels: [string, string, string]; // posts, followers, following
  posts: number;
  following: number;
  accent: string;
  accent2: string;
  followText: string;
  followingText: string;
};
export const followDefaults: FollowProps = {
  duration: 4.6,
  side: 'right',
  name: 'הסטודיו שלי',
  handle: '@my.studio',
  avatar: '🎬',
  from: 9420,
  to: 10000,
  badge: '10K',
  labels: ['פוסטים', 'עוקבים', 'נעקבים'],
  posts: 128,
  following: 312,
  accent: '#FF4F8B',
  accent2: '#FF9A3D',
  followText: 'מעקב',
  followingText: 'במעקב ✓',
};

const W = 680;
const H = 365;

export const SocFollow: React.FC<FollowProps> = (props) => {
  const p = {...followDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const rtl = dirOf(p.name + p.labels.join('')) === 'rtl';
  const run = inOut(p01(t, 0.6, 2.5));
  const TAP = 2.85;
  const count = Math.round(lerp(p.from, p.to - 1, run)) + (t >= TAP + 0.05 ? 1 : 0);
  const crossed = t >= TAP + 0.05;
  const badge = spr(t, TAP + 0.12, 16, 8);
  const press = p01(t, TAP - 0.12, TAP) * (1 - p01(t, TAP + 0.05, TAP + 0.2));
  const flip = outE(p01(t, TAP, TAP + 0.3));
  const touch = p01(t, TAP - 0.35, TAP - 0.15) * (1 - p01(t, TAP + 0.1, TAP + 0.35));
  const avatarX = rtl ? W - 40 - 150 : 40;
  return (
    <Stage p={p} w={W} h={H + 120} 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: 120, width: W, height: H, borderRadius: 44, background: '#fff', boxShadow: SHADOW}} />
        {/* avatar with a gradient ring */}
        <div style={{position: 'absolute', left: avatarX, top: 150, width: 150, height: 150, borderRadius: 150, background: `conic-gradient(from ${t * 120}deg, ${p.accent}, ${p.accent2}, ${p.accent})`, padding: 7, boxSizing: 'border-box'}}>
          <div style={{width: '100%', height: '100%', borderRadius: 150, background: '#fff', padding: 6, boxSizing: 'border-box'}}>
            <div style={{width: '100%', height: '100%', borderRadius: 150, background: rgba(p.accent, 0.12), display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 64, fontWeight: 800, color: p.accent}}>{p.avatar}</div>
          </div>
        </div>
        {/* badge */}
        {crossed && (
          <div style={{position: 'absolute', left: avatarX + 75 - 80, width: 160, boxSizing: 'border-box', textAlign: 'center', top: 272, padding: '6px 0', borderRadius: 40, background: `linear-gradient(135deg, ${p.accent}, ${p.accent2})`,
            color: '#fff', fontWeight: 900, fontSize: 32, transform: `scale(${badge}) rotate(${lerp(-30, -6, Math.min(1, badge))}deg)`, zIndex: 5, boxShadow: `0 8px 20px ${rgba(p.accent, 0.4)}`, direction: 'ltr'}}>
            {p.badge} 🎉
          </div>
        )}
        {/* name */}
        <div style={{position: 'absolute', top: 160, [rtl ? 'right' : 'left']: 220, fontSize: 40, fontWeight: 800, color: '#16151a'}}>{p.name}</div>
        <div style={{position: 'absolute', top: 212, [rtl ? 'right' : 'left']: 220, fontSize: 26, color: 'rgba(22,21,26,0.5)', direction: 'ltr', unicodeBidi: 'isolate'}}>{p.handle}</div>
        {/* stats */}
        {[p.posts, count, p.following].map((v, i) => {
          const hot = i === 1;
          const x = rtl ? W - 115 - (i + 1) * 150 : 115 + i * 150;
          return (
            <div key={i} style={{position: 'absolute', top: 345, left: x, width: 150, textAlign: 'center'}}>
              <div style={{fontSize: hot ? 44 : 36, fontWeight: 900, color: hot ? p.accent : '#16151a', direction: 'ltr', fontVariantNumeric: 'tabular-nums',
                transform: hot && crossed ? `scale(${lerp(1.25, 1, spr(t, TAP + 0.05, 18, 9))})` : undefined}}>{fmt(v)}</div>
              <div style={{fontSize: 24, color: 'rgba(22,21,26,0.5)', marginTop: -4}}>{p.labels[i]}</div>
            </div>
          );
        })}
        {/* +1 chips off the followers number */}
        {Array.from({length: 9}, (_, i) => {
          const t0 = 0.7 + i * 0.2;
          const k = p01(t, t0, t0 + 0.8);
          if (k <= 0 || k >= 1) return null;
          const x = (rtl ? W - 115 - 2 * 150 : 115 + 150) + 75 + (rnd(i, 3) - 0.5) * 90;
          return (
            <div key={i} style={{position: 'absolute', left: x - 30 + (i % 2 ? 1 : -1) * outE(k) * 70, top: 345 - outE(k) * 45, padding: '2px 10px', borderRadius: 20, background: p.accent, color: '#fff',
              zIndex: 6, fontWeight: 800, fontSize: 22, opacity: Math.min(1, k * 5) * (1 - p01(k, 0.6, 1)), transform: `scale(${0.6 + 0.4 * outE(Math.min(1, k * 3))})`, direction: 'ltr'}}>+{1 + Math.floor(rnd(i, 5) * 9)}</div>
          );
        })}
        {/* follow button */}
        {(() => {
          const bx = rtl ? W - 220 - 210 : 220;
          const by = 256;
          return (
            <>
              <div style={{position: 'absolute', left: bx, top: by, width: 210, height: 58, borderRadius: 18, transform: `scale(${1 - 0.06 * press})`,
                background: flip > 0.5 ? 'rgba(22,21,26,0.07)' : `linear-gradient(135deg, ${p.accent}, ${p.accent2})`, color: flip > 0.5 ? '#16151a' : '#fff',
                display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 28, fontWeight: 800, boxShadow: flip > 0.5 ? 'none' : `0 8px 18px ${rgba(p.accent, 0.35)}`}}>
                <span style={{transform: `translateY(${(flip < 0.5 ? -flip : 1 - flip) * 30}px)`, opacity: 1 - Math.sin(flip * Math.PI) * 0.9}}>{flip > 0.5 ? p.followingText : p.followText}</span>
              </div>
              {touch > 0 && (
                <div style={{position: 'absolute', left: bx + 105 - 44, top: by + 29 - 44, width: 88, height: 88, borderRadius: 88, background: rgba('#16151a', 0.15 * touch),
                  border: `3px solid ${rgba('#16151a', 0.3 * touch)}`, transform: `scale(${lerp(1.3, 0.85, p01(t, TAP - 0.35, TAP))})`}} />
              )}
            </>
          );
        })()}
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibSocFollow', component: SocFollow, defaults: followDefaults};