/**
 * Drag to select / גרירה ובחירה  (student motion library, id "cur-drag-select")
 * Use: copy this file into your Remotion project and register it in your Root:
 *   <Composition id="LibCurDragSelect" component={CurDragSelect} width={1920} height={1080} fps={30}
 *     durationInFrames={138} defaultProps={dragSelectDefaults} />
 * Render transparent: npx remotion render src/index.ts LibCurDragSelect out.webm --codec=vp9 --pixel-format=yuva420p --image-format=png --props=props.json
 * Change the words / colours / side in props.json (same keys as dragSelectDefaults). 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

/**
 * Drag select: six clip tiles pop in, the cursor presses at a corner and drags a selection box across them; each
 * tile lights up the moment the box touches it, the box lets go and a "4 selected" chip pops. 4.6 s.
 * Inspired by drag-select demos (CodePen "Drag-Select") and "Cursor Box Select Animation" (VideoCaptions), redesigned:
 * clip tiles with live selection + a count chip.
 */
export type DragSelectProps = Base & {
  tiles: {label: string; emoji: string; color: string}[];
  chip: string; // {n} = how many
  accent: string;
};
export const dragSelectDefaults: DragSelectProps = {
  duration: 4.6,
  side: 'right',
  tiles: [
    {label: 'פתיח', emoji: '🎬', color: '#FFD9C7'},
    {label: 'ראיון', emoji: '🎙️', color: '#D8E4FF'},
    {label: 'בי-רול', emoji: '🌇', color: '#D9F5E8'},
    {label: 'מוזיקה', emoji: '🎵', color: '#F3DDFF'},
    {label: 'כתוביות', emoji: '💬', color: '#FFF1BF'},
    {label: 'סיום', emoji: '✨', color: '#FFDDE6'},
  ],
  chip: '{n} קליפים נבחרו',
  accent: '#3B6BFF',
};

const W = 780;
const H = 560;
const TW = 210;
const TH = 160;
const GX = 36;
const GY = 34;

export const CurDragSelect: React.FC<DragSelectProps> = (props) => {
  const p = {...dragSelectDefaults, ...props};
  const t = useT();
  const font = p.font ?? HEEBO;
  const rtl = dirOf(p.chip + p.tiles.map((x) => x.label).join('')) === 'rtl';
  const cols = 3;
  const gw = cols * TW + (cols - 1) * GX;
  const ox = (W - gw) / 2;
  const oy = 60;
  const tilePos = (i: number) => {
    const c = i % cols;
    const r = Math.floor(i / cols);
    const cc = rtl ? cols - 1 - c : c; // reading order
    return [ox + cc * (TW + GX), oy + r * (TH + GY)];
  };
  // drag from the reading-start corner over the first two columns, both rows
  const A: [number, number] = [rtl ? W - ox + 26 : ox - 26, oy - 26];
  const B: [number, number] = [rtl ? ox + TW + GX + 40 : W - ox - TW - GX - 40, oy + 2 * TH + GY + 26];
  const goIn = inOut(p01(t, 0.6, 1.25));
  const drag = inOut(p01(t, 1.45, 2.55));
  const release = t > 2.7;
  const cIn: [number, number] = [lerp(rtl ? -40 : W + 40, A[0], goIn), lerp(H + 60, A[1], goIn)];
  const cur: [number, number] = t < 1.45 ? cIn : [lerp(A[0], B[0], drag), lerp(A[1], B[1], drag)];
  const leave = inOut(p01(t, 3.0, 3.5));
  const cpos: [number, number] = [lerp(cur[0], cur[0] + (rtl ? -60 : 60), leave), lerp(cur[1], H + 80, leave)];
  const pressed = t > 1.35 && t < 2.7;
  const box = t > 1.45 && !release ? {x0: Math.min(A[0], cur[0]), y0: Math.min(A[1], cur[1]), x1: Math.max(A[0], cur[0]), y1: Math.max(A[1], cur[1])} : null;
  const lastBox = {x0: Math.min(A[0], B[0]), y0: Math.min(A[1], B[1]), x1: Math.max(A[0], B[0]), y1: Math.max(A[1], B[1])};
  const hit = (i: number, b: {x0: number; y0: number; x1: number; y1: number} | null) => {
    if (!b) return false;
    const [x, y] = tilePos(i);
    return x < b.x1 && x + TW > b.x0 && y < b.y1 && y + TH > b.y0;
  };
  const selected = p.tiles.map((_, i) => (release ? hit(i, lastBox) : hit(i, box)));
  const n = selected.filter(Boolean).length;
  const chip = spr(t, 2.8, 16, 9);
  return (
    <Stage p={p} w={W} h={H} defSide="right">
      <div style={{position: 'absolute', inset: 0, ...lifeStyle(t, p.duration!, 0.2, 0.4), fontFamily: font}}>
        {p.tiles.map((tile, i) => {
          const [x, y] = tilePos(i);
          const k = spr(t, 0.05 + i * 0.06, 16, 9);
          const sel = selected[i];
          return (
            <div key={i} style={{position: 'absolute', left: x, top: y, width: TW, height: TH, borderRadius: 26, background: '#fff', boxShadow: SHADOW,
              transform: `scale(${k * (sel ? 0.97 : 1)})`, outline: sel ? `5px solid ${p.accent}` : 'none', outlineOffset: 3}}>
              <div style={{position: 'absolute', left: 10, right: 10, top: 10, height: TH - 62, borderRadius: 18, background: tile.color, display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 52}}>{tile.emoji}</div>
              <div style={{position: 'absolute', left: 14, right: 14, bottom: 12, fontSize: 26, fontWeight: 700, color: '#16151a', direction: dirOf(tile.label), textAlign: rtl ? 'right' : 'left'}}>{tile.label}</div>
              {sel && (
                <div style={{position: 'absolute', top: -14, [rtl ? 'left' : 'right']: -14, width: 46, height: 46, borderRadius: 46, background: p.accent, border: '4px solid #fff',
                  display: 'flex', alignItems: 'center', justifyContent: 'center'}}>
                  <svg viewBox="0 0 24 24" width={26} height={26}><path d="M5 12.5l4.5 4.5L19 7.5" fill="none" stroke="#fff" strokeWidth={3.4} strokeLinecap="round" strokeLinejoin="round" /></svg>
                </div>
              )}
            </div>
          );
        })}
        {box && (
          <div style={{position: 'absolute', left: box.x0, top: box.y0, width: box.x1 - box.x0, height: box.y1 - box.y0, background: rgba(p.accent, 0.14), border: `3px solid ${rgba(p.accent, 0.9)}`, borderRadius: 6}} />
        )}
        {release && (
          <div style={{position: 'absolute', left: 0, right: 0, top: H - 64, display: 'flex', justifyContent: 'center'}}>
            <div style={{padding: '12px 28px', borderRadius: 40, background: p.accent, color: '#fff', fontSize: 30, fontWeight: 800, transform: `scale(${chip})`, boxShadow: `0 10px 24px ${rgba(p.accent, 0.4)}`, direction: rtl ? 'rtl' : 'ltr'}}>
              {p.chip.replace('{n}', String(n))}
            </div>
          </div>
        )}
        {goIn > 0 && leave < 1 && <Cursor x={cpos[0]} y={cpos[1]} press={pressed ? 1 : 0} size={1.7} />}
      </div>
    </Stage>
  );
};

export const meta = {id: 'LibCurDragSelect', component: CurDragSelect, defaults: dragSelectDefaults};