/**
 * Story progress + reply bar / מסגרת סטורי  (student motion library, id "soc-story-bar")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibSocStoryBar" component={SocStoryBar} width={1920} height={1080} fps={30}
 *     durationInFrames={150} defaultProps={storyDefaults} />
 * Render transparent: npx remotion render src/index.ts LibSocStoryBar out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as storyDefaults). 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

/**
 * Story overlay: soft top and bottom shades, segmented progress bars (one fills, a tap jumps to the next), the
 * avatar with its gradient ring + name + time, and at the bottom a reply pill with a heart that gets tapped and sends
 * a few hearts up; a link sticker pops in the middle. Made for a vertical video (change the composition to 1080x1920); in 16:9 it frames the shot. 5 s.
 * Inspired by "Instagram Story iOS" / "Profile: New Story" (Jitter), redesigned: generic story chrome, own colours.
 */
export type StoryProps = Base & {
  name: string;
  time: string;
  avatar: string;
  segments: number;
  current: number; // index of the segment that is playing at the start
  reply: string;
  link: string; // a link sticker in the middle ('' = none)
  ring1: string;
  ring2: string;
  heart: string;
};
export const storyDefaults: StoryProps = {
  duration: 5,
  side: 'center',
  name: 'הסטודיו שלי',
  time: '2 שע׳',
  avatar: '🎬',
  segments: 4,
  current: 1,
  reply: 'שליחת הודעה',
  link: '🔗 הקישור לקורס',
  ring1: '#FFB23F',
  ring2: '#FF3D8B',
  heart: '#FF3B6B',
};

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';

export const SocStoryBar: React.FC<StoryProps> = (props) => {
  const p = {...storyDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const total = p.duration!;
  const rtl = dirOf(p.name + p.reply) === 'rtl';
  const vc = useVideoConfig();
  const u = (Math.min(vc.width, vc.height) / 1080) * (p.scale ?? 1);
  const W = Math.min(1000, vc.width / u - 80); // fills the frame's height in any format
  const H = vc.height / u - 40;
  const inK = outE(p01(t, 0, 0.5));
  const outK = p01(t, total - 0.4, total - 0.04);
  const op = inK * (1 - outK);
  const TAP = 2.6;
  const seg = (i: number) => {
    if (i < p.current) return 1;
    if (i === p.current) return t < TAP ? lerp(0.08, 0.7, p01(t, 0.3, TAP)) : 1;
    if (i === p.current + 1) return t < TAP ? 0 : p01(t, TAP + 0.05, total + 1.6);
    return 0;
  };
  const HT = 3.5;
  const heartOn = t >= HT;
  const heartPop = spr(t, HT, 18, 7);
  const tapFlash = p01(t, TAP - 0.05, TAP + 0.05) * (1 - p01(t, TAP + 0.05, TAP + 0.4));
  return (
    <Stage p={p} w={W} h={H} defSide="center">
      <div style={{position: 'absolute', inset: 0, opacity: op, fontFamily: font}}>
        {/* shades so white UI reads on any footage */}
        <div style={{position: 'absolute', left: -60, right: -60, top: -20, height: 260, background: 'linear-gradient(180deg, rgba(0,0,0,0.42), rgba(0,0,0,0))', borderRadius: 30}} />
        <div style={{position: 'absolute', left: -60, right: -60, bottom: -20, height: 240, background: 'linear-gradient(0deg, rgba(0,0,0,0.42), rgba(0,0,0,0))', borderRadius: 30}} />
        {/* progress segments (story order runs with the reading direction) */}
        <div style={{position: 'absolute', left: 30, right: 30, top: 24, display: 'flex', gap: 10, direction: rtl ? 'rtl' : 'ltr', transform: `translateY(${(1 - inK) * -20}px)`}}>
          {Array.from({length: p.segments}, (_, i) => (
            <div key={i} style={{flex: 1, height: 9, borderRadius: 9, background: 'rgba(255,255,255,0.35)', overflow: 'hidden'}}>
              <div style={{width: `${seg(i) * 100}%`, height: '100%', background: '#fff', borderRadius: 9}} />
            </div>
          ))}
        </div>
        {/* header */}
        <div style={{position: 'absolute', left: 30, right: 30, top: 60, display: 'flex', alignItems: 'center', gap: 20, direction: rtl ? 'rtl' : 'ltr', transform: `translateY(${(1 - inK) * -20}px)`}}>
          <div style={{width: 92, height: 92, borderRadius: 92, padding: 5, boxSizing: 'border-box', background: `conic-gradient(from ${t * 90}deg, ${p.ring1}, ${p.ring2}, ${p.ring1})`}}>
            <div style={{width: '100%', height: '100%', borderRadius: 92, border: '4px solid #fff', boxSizing: 'border-box', background: '#2a2930', display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 40}}>{p.avatar}</div>
          </div>
          <div style={{fontSize: 36, fontWeight: 800, color: '#fff', textShadow: '0 2px 8px rgba(0,0,0,0.35)'}}>{p.name}</div>
          <div style={{fontSize: 30, fontWeight: 400, color: 'rgba(255,255,255,0.75)', textShadow: '0 2px 8px rgba(0,0,0,0.35)'}}>{p.time}</div>
          <div style={{flex: 1}} />
          <div style={{fontSize: 44, color: '#fff', letterSpacing: 2, marginTop: -16}}>···</div>
          <div style={{fontSize: 46, color: '#fff', fontWeight: 300}}>✕</div>
        </div>
        {/* tap flash on the next-story side */}
        {tapFlash > 0 && (
          <div style={{position: 'absolute', top: 300, [rtl ? 'left' : 'right']: 40, width: 160, height: 160, borderRadius: 160, background: rgba('#ffffff', 0.35 * tapFlash),
            transform: `scale(${lerp(0.6, 1.3, p01(t, TAP - 0.05, TAP + 0.4))})`}} />
        )}
        {/* link sticker */}
        {p.link && (
          <div style={{position: 'absolute', left: 0, right: 0, top: H * 0.6, display: 'flex', justifyContent: 'center'}}>
            <div style={{padding: '18px 34px', borderRadius: 22, background: '#fff', color: p.ring2, fontSize: 38, fontWeight: 800, boxShadow: '0 10px 26px rgba(0,0,0,0.25)',
              direction: rtl ? 'rtl' : 'ltr', transform: `scale(${spr(t, 1.1, 15, 8)}) rotate(${-4 + Math.sin(Math.max(0, t - 1.4) * 5) * 2 * Math.exp(-Math.max(0, t - 1.4) * 1.5)}deg)`}}>
              {p.link}
            </div>
          </div>
        )}
        {/* reply row */}
        <div style={{position: 'absolute', left: 30, right: 30, bottom: 40, display: 'flex', alignItems: 'center', gap: 26, direction: rtl ? 'rtl' : 'ltr', transform: `translateY(${(1 - inK) * 20}px)`}}>
          <div style={{flex: 1, height: 92, borderRadius: 92, border: '3px solid rgba(255,255,255,0.85)', display: 'flex', alignItems: 'center', padding: '0 34px', fontSize: 32, color: '#fff'}}>{p.reply}</div>
          <div style={{position: 'relative', width: 70, height: 70}}>
            {Array.from({length: 6}, (_, i) => {
              const k = p01(t, HT + 0.05 + i * 0.08, HT + 1.0 + i * 0.08);
              if (k <= 0 || k >= 1) return null;
              const s = 30 + rnd(i, 2) * 24;
              return (
                <svg key={i} viewBox="0 0 24 24" width={s} height={s} style={{position: 'absolute', left: 35 - s / 2 + Math.sin(k * 6 + i) * 26, top: 35 - s / 2 - outE(k) * 300, opacity: 1 - p01(k, 0.5, 1)}}>
                  <path d={HEART} fill={i % 2 ? p.ring1 : p.heart} />
                </svg>
              );
            })}
            <svg viewBox="0 0 24 24" width={70} height={70} style={{transform: `scale(${heartOn ? lerp(0.6, 1, heartPop) : 1})`}}>
              <path d={HEART} fill={heartOn ? p.heart : 'none'} stroke={heartOn ? p.heart : '#fff'} strokeWidth={1.8} />
            </svg>
          </div>
          <svg viewBox="0 0 24 24" width={64} height={64} style={{transform: rtl ? 'scaleX(-1)' : undefined}}>
            <path d="M3 11.5 L21 3 L13.5 21 L11 13 Z" fill="none" stroke="#fff" strokeWidth={1.8} strokeLinejoin="round" />
          </svg>
        </div>
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibSocStoryBar', component: SocStoryBar, defaults: storyDefaults};