// list-stack-press —— 列表卡从底部逐张飞上摞起，每张落地压弹整摞、计数器同步跳格
// "堆叠有重量"：每张新卡落上来，已落定的整摞被压下再弹回——物理反馈里读出
// "这是实打实攒下来的东西"。参考实现从 template ScenePapers 剥离：
// 预备拍（计数器先于首卡 4–6f 亮起微缩，把视线引到堆叠区）；5 卡 12f 等距节拍
// 从底部 600px 升入（交替 ±2° 倾斜收平 + scale 1.06→1）；后一张到场时整摞压下
// 6px、8f 弹回（stackPress 脉冲——"有重量"的关键一笔）；落地后高亮条滞后 2–4f
// 长出；收尾一道 glaze 扫光掠过整摞；屏幕空间 DigitRoll 计数器落一张滚一格。
// 正视机位（堆叠/列表镜头必须正视，Q6），相机跟随堆叠向下。
import { AbsoluteFill, Img, interpolate, staticFile, useCurrentFrame, Easing } from 'remotion';
import { PageCam2D, CamKey2D } from '../../_fixtures/PageCam2D';
import layout from '../../_textures/live-layout.json';

export const LIST_STACK_PRESS_DURATION = 88; // 18–88f 落在 shot 内 offset 0

const cards = layout.papers.cards;
const PAGE_H = layout.papers.pageH;
const MONO = 'ui-monospace, SFMono-Regular, Menlo, monospace';
const AMBER = 'oklch(52% 0.115 65)';
const FILES = ['paper1.png', 'paper2.png', 'paper3.png', 'paper4.png', 'paper5.png'];

const CUES = [6, 18, 30, 42, 54]; // 首卡前留 6f 给计数器预备拍（anticipation）
const DUR = 22;
const FLY_EASE = Easing.bezier(0.45, 0.05, 0.25, 1.12);
const TILTS = [2, -2, 2, -2, 2];

// 预备拍：计数器先于首卡亮起 + 微缩 (0.96→1)，把视线引到堆叠区（段落级一次）
const ANTICIPATE_START = 0;
const ANTICIPATE_END = 6;

const CAM_KEYS: CamKey2D[] = [
  { frame: 0, cx: 960, cy: 270, zoom: 1.35 },
  { frame: 12, cx: 960, cy: 330, zoom: 1.15 },
  { frame: 18, cx: 960, cy: 520, zoom: 1.02 },
  { frame: 56, cx: 960, cy: 820, zoom: 0.95 },
  { frame: 82, cx: 960, cy: 860, zoom: 0.9 },
];

// odometer digit column —— 连续里程计，不重挂：`pos` 是数字带上的连续位置
// （0→5），每张卡落地让 pos 多滚进一格。单格滚动必须短于 12f 落卡间距、
// 且最后一格在镜头结束前落定——key 重挂从 0 重滚 22f 的写法两条都踩
// （前一格永远滚不完、尾帧停在 4）。
const DIGITS = '0123456789';
const ROLL_DUR = 8; // 单格滚动帧数，< 12f 落卡间距
const DigitRoll: React.FC<{ pos: number; lineH: number; color: string }> = ({ pos, lineH, color }) => (
  <span style={{ display: 'inline-flex', overflow: 'hidden', height: lineH, verticalAlign: 'bottom' }}>
    <span style={{ display: 'inline-block', height: lineH }}>
      <span style={{ display: 'block', transform: `translateY(${-pos * lineH}px)` }}>
        {(DIGITS + DIGITS).split('').map((d, j) => (
          <span key={j} style={{ display: 'block', fontSize: 96, lineHeight: `${lineH}px`, color, fontVariantNumeric: 'tabular-nums' }}>
            {d}
          </span>
        ))}
      </span>
    </span>
  </span>
);

export const ListStackPress: React.FC = () => {
  const frame = useCurrentFrame();
  // 计数器连续位置：每张卡落地（cue+DUR）时向前滚一格，8f 滚定。
  // 最后一张 f76 落地、f84 滚定，早于 f88 镜头结束。
  let rollPos = 0;
  for (const c of CUES) {
    rollPos += interpolate(frame, [c + DUR, c + DUR + ROLL_DUR], [0, 1], {
      extrapolateLeft: 'clamp', extrapolateRight: 'clamp', easing: Easing.bezier(0.25, 0.8, 0.25, 1),
    });
  }

  // 预备拍：计数器 0→6f 从 scale 0.96 微缩回 1 并亮起，视线先引到堆叠区
  const antT = interpolate(frame, [ANTICIPATE_START, ANTICIPATE_END], [0, 1], {
    extrapolateLeft: 'clamp', extrapolateRight: 'clamp', easing: Easing.out(Easing.quad),
  });
  const counterScale = 0.96 + 0.04 * antT;
  const counterOpacity = 0.3 + 0.7 * antT;

  // when a *later* card enters, the settled stack gets pressed down 6px then
  // springs back over ~8 frames
  const stackPress = (settledIndex: number) => {
    let press = 0;
    for (let j = settledIndex + 1; j < CUES.length; j++) {
      const cue = CUES[j];
      const p = interpolate(frame, [cue, cue + 4, cue + 8], [0, 6, 0], {
        extrapolateLeft: 'clamp', extrapolateRight: 'clamp',
      });
      press = Math.max(press, p);
    }
    return press;
  };

  // glaze sweep once everything has landed (~78)
  const glazeX = interpolate(frame, [64, 78], [-700, 2600], {
    extrapolateLeft: 'clamp', extrapolateRight: 'clamp', easing: Easing.bezier(0.45, 0, 0.35, 1),
  });
  const glazeVis = interpolate(frame, [63, 68, 74, 77], [0, 1, 1, 0], {
    extrapolateLeft: 'clamp', extrapolateRight: 'clamp',
  });

  return (
    <AbsoluteFill style={{ backgroundColor: '#faf7f2' }}>
      <PageCam2D src="textures/live/papers-full.png" pageH={PAGE_H} keys={CAM_KEYS}>
        {/* cover the printed cards so blank slots stack in */}
        {cards.map((c, i) => (
          <div
            key={`slot-${i}`}
            style={{
              position: 'absolute', left: c.x - 12, top: c.y - 10,
              width: c.w + 24, height: c.h + 20, background: '#faf7f2',
              opacity: frame >= CUES[i] + DUR - 2 ? 0 : 1,
            }}
          />
        ))}

        {cards.map((c, i) => {
          const cue = CUES[i];
          const t = interpolate(frame, [cue, cue + DUR], [0, 1], {
            extrapolateLeft: 'clamp', extrapolateRight: 'clamp', easing: FLY_EASE,
          });
          if (t <= 0) return null;
          const settled = t >= 0.999;
          const dy = 600 * (1 - t) + (settled ? stackPress(i) : 0);
          const rot = TILTS[i] * (1 - t);
          const scale = 1.06 - 0.06 * t;
          const shadow = settled
            ? '0 2px 8px rgba(60,45,30,.10)'
            : `0 32px 64px rgba(60,45,30,${0.22 * (1 - t) + 0.06})`;

          // amber highlight over the linked-project name, after landing
          const hlStart = cue + DUR;
          const hlGrow = interpolate(frame, [hlStart, hlStart + 7], [0, 1], {
            extrapolateLeft: 'clamp', extrapolateRight: 'clamp', easing: Easing.bezier(0.3, 0, 0.2, 1),
          });
          const hlFade = interpolate(frame, [hlStart + 7, hlStart + 12], [1, 0], {
            extrapolateLeft: 'clamp', extrapolateRight: 'clamp',
          });

          return (
            <div
              key={FILES[i]}
              style={{
                position: 'absolute', left: c.x, top: c.y, width: c.w, height: c.h,
                transform: `translateY(${dy}px) rotate(${rot}deg) scale(${scale})`,
                transformOrigin: 'center center', boxShadow: shadow, borderRadius: 12,
              }}
            >
              <Img src={staticFile(`textures/live/${FILES[i]}`)} style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', display: 'block' }} />
              {hlGrow > 0 && hlFade > 0 ? (
                <div
                  style={{
                    position: 'absolute', left: 20, top: c.h * 0.72,
                    width: `${hlGrow * 40}%`, height: 30,
                    background: 'oklch(97% 0.028 85)', opacity: 0.6 * hlFade,
                    borderRight: `2px solid ${AMBER}`, pointerEvents: 'none',
                  }}
                />
              ) : null}
            </div>
          );
        })}

        {/* page-space glaze sweep at the end */}
        <div
          style={{
            position: 'absolute', top: 40, height: PAGE_H - 80, left: glazeX, width: 420,
            transform: 'rotate(14deg)', opacity: glazeVis * 0.5, mixBlendMode: 'overlay',
            background: 'linear-gradient(90deg, transparent, rgba(255,240,214,0.9) 45%, rgba(255,240,214,0.9) 55%, transparent)',
            pointerEvents: 'none',
          }}
        />
      </PageCam2D>

      {/* screen-space counter, top-right — lands one digit per card */}
      <div
        style={{
          position: 'absolute', top: 70, right: 96, textAlign: 'right',
          pointerEvents: 'none', opacity: counterOpacity,
          transform: `scale(${counterScale})`, transformOrigin: 'top right',
        }}
      >
        <div style={{ fontFamily: MONO, fontSize: 24, letterSpacing: '0.16em', color: 'oklch(50% 0.006 82)', textTransform: 'uppercase' }}>
          Paper Radar
        </div>
        <div style={{ display: 'flex', justifyContent: 'flex-end', marginTop: 6 }}>
          <DigitRoll pos={rollPos} lineH={96 * 1.15} color={AMBER} />
        </div>
        <div style={{ fontFamily: MONO, fontSize: 20, letterSpacing: '0.12em', color: 'oklch(50% 0.006 82)', marginTop: 4, textTransform: 'uppercase' }}>
          Of 31 Fetched Today
        </div>
      </div>
    </AbsoluteFill>
  );
};