// ===== demos/transition/transition-hidden-cut/InvisibleCut.tsx =====
import React from 'react';
import { AbsoluteFill, Easing, interpolate, useCurrentFrame } from 'remotion';
import { CameraMotionBlur } from '@remotion/motion-blur';
import { FakeDashboard, Card, G } from '../../_fixtures/Fixtures';

// invisible-cut：前景遮挡隐形切——一张放大到超出画幅的卡片带重运动模糊
// 从左侧贴脸扫过，糊满屏幕的瞬间背景从 A 无痕换成 B，卡片飞出右侧时
// 观众以为还是同一镜。（invisible-cut + foreground-occlusion-swipe）
const SW_START = 40; // 卡片入场
const SW_END = 54; // 卡片出场（14f 横扫）
const CUT = 47; // 硬切点：扫掠中点，卡片完全糊满画面的那一帧

// 卡片中扫掠曲线上的水平位置（容器 left，未缩放坐标）
const xAt = (f: number) =>
  // 卡片 scale(1.6) 后半宽 1280：起点右缘 -120 / 终点左缘 2120，均完全出画；
  // 中点 f47 覆盖 -280..2280，糊满整个 1920 画幅
  interpolate(f, [SW_START, SW_END], [-2200, 2600], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.bezier(0.3, 0, 0.7, 1),
  });

const Scene: React.FC = () => {
  const frame = useCurrentFrame();
  const x = xAt(frame);
  // 瞬时速度（px/帧），驱动斜切与残影强度
  const v = xAt(frame + 0.5) - xAt(frame - 0.5);
  const sweeping = frame > SW_START - 2 && frame < SW_END + 3;
  // 背景被"带风"轻推：A 被拖向左，切成 B 后从右侧回稳——卖同一镜错觉
  const shove =
    frame < CUT
      ? interpolate(frame, [SW_START, CUT], [0, -40], {
          extrapolateLeft: 'clamp',
          extrapolateRight: 'clamp',
          easing: Easing.in(Easing.quad),
        })
      : interpolate(frame, [CUT, CUT + 13], [40, 0], {
          extrapolateLeft: 'clamp',
          extrapolateRight: 'clamp',
          easing: Easing.out(Easing.cubic),
        });
  return (
    <AbsoluteFill style={{ background: G.bg, overflow: 'hidden' }}>
      {/* 背景层：硬切藏在遮挡帧内 */}
      <div style={{ position: 'absolute', inset: 0, transform: `translateX(${shove}px)` }}>
        {frame < CUT ? <FakeDashboard variant="A" /> : <FakeDashboard variant="B" />}
      </div>
      {/* 手动残影：4 层拖尾（在主卡身后），保证遮挡窗口糊满全屏 */}
      {sweeping &&
        [4, 3, 2, 1].map((i) => (
          <div
            key={i}
            style={{
              position: 'absolute',
              left: xAt(frame - i * 0.55),
              top: 40,
              width: 1600,
              height: 1000,
              transform: 'scale(1.6)',
              opacity: [0, 0.35, 0.22, 0.13, 0.07][i],
              filter: 'blur(14px)',
            }}
          >
            <Card w={1600} h={1000} seed={9} style={{ width: '100%', height: '100%' }} />
          </div>
        ))}
      {/* 主卡：1600x1000 放大 1.6 倍（2560x1600 超出画幅），自带 blur 加强糊感 */}
      {sweeping && (
        <div
          style={{
            position: 'absolute',
            left: x,
            top: 40,
            width: 1600,
            height: 1000,
            transform: `scale(1.6) skewX(${-v * 0.018}deg)`,
            filter: 'blur(8px)',
            boxShadow: '0 24px 80px rgba(0,0,0,0.3)',
            borderRadius: 20,
          }}
        >
          <Card w={1600} h={1000} seed={9} style={{ width: '100%', height: '100%' }} />
        </div>
      )}
    </AbsoluteFill>
  );
};

export const InvisibleCut: React.FC = () => (
  <CameraMotionBlur shutterAngle={300} samples={12}>
    <Scene />
  </CameraMotionBlur>
);


// ===== demos/transition/transition-hidden-cut/LightLeakBurn.tsx =====
import React from 'react';
import { AbsoluteFill, Easing, interpolate, useCurrentFrame } from 'remotion';
import { FakeDashboard, TitleBlock, G } from '../../_fixtures/Fixtures';

// light-leak-burn〔转场〕：一团琥珀橙柔光从右上角斜扫入画，亮度顶峰时
// 吞掉旧画面约七成（高光溢出、对比度被冲淡），光峰帧后切新页藏切点，
// 光退散时新页已在光下就位——比白闪柔、有方向、有温度。
// 节拍：0–25 建立旧页 hold；25–52 光斜扫入、爬向峰值；52 峰值帧切页；
// 52–95 光沿对角线退出、强度衰减；95–130 新页静止 hold。

const PEAK = 52; // 光峰帧 = 藏切点

export const LightLeakBurn: React.FC = () => {
  const frame = useCurrentFrame();

  // 光团沿对角线的位移进度：右上外 → 左下外，贯穿 25–95
  const sweep = interpolate(frame, [25, 95], [0, 1], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.bezier(0.4, 0, 0.3, 1),
  });

  // 光强包络：25–PEAK 爬升（ease-in 有蓄力感），PEAK–95 收敛（ease-out 余温）
  const rise = interpolate(frame, [25, PEAK], [0, 1], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.in(Easing.quad),
  });
  const fall = interpolate(frame, [PEAK, 95], [1, 0], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.out(Easing.cubic),
  });
  const intensity = frame <= PEAK ? rise : fall;

  // 光团中心：从画面右上外侧斜扫到左下外侧（有方向的漏光）
  const cx = interpolate(sweep, [0, 1], [2350, -650]);
  const cy = interpolate(sweep, [0, 1], [-500, 1500]);

  // 三团琥珀光的偏移与直径（seed 正弦哈希做微差，避免完美同心）
  const blobs = [0, 1, 2].map((i) => {
    const j1 = (Math.sin(i * 127.3) * 43758) % 1; // -1..1 小数
    const j2 = (Math.sin(i * 311.7) * 27183) % 1;
    return {
      dx: i * 260 - 260 + j1 * 90, // 沿扫掠方向拖尾排布
      dy: i * 200 - 200 + j2 * 70,
      d: 1500 + i * 450, // 直径 1500 / 1950 / 2400
      color: ['#f6c878', '#e8a44a', '#d98a2b'][i],
      alpha: [0.95, 0.8, 0.55][i],
    };
  });

  // 峰值时页面被光冲淡：对比度降、亮度抬（旧页被"烧穿"的感觉）
  const pageFilter = `contrast(${1 - intensity * 0.45}) brightness(${1 + intensity * 0.35})`;

  // 全屏暖色罩：峰值时约 8%
  const warmWash = intensity * 0.08;

  return (
    <AbsoluteFill style={{ background: G.bg, overflow: 'hidden' }}>
      {/* 页面层：光峰帧前是旧页（网格），之后是新页（列表+标题）——切点藏在最亮处 */}
      <AbsoluteFill style={{ filter: pageFilter }}>
        {frame <= PEAK ? (
          <FakeDashboard variant="A" />
        ) : (
          <>
            <FakeDashboard variant="B" />
            <div style={{ position: 'absolute', left: 288, top: 132 }}>
              <TitleBlock text="Next Page" size={64} />
            </div>
          </>
        )}
      </AbsoluteFill>

      {/* 全屏暖色罩：峰值 8%，让高光溢出带温度 */}
      <AbsoluteFill
        style={{
          background: '#e8a44a',
          opacity: warmWash,
          mixBlendMode: 'screen',
          pointerEvents: 'none',
        }}
      />

      {/* 琥珀漏光层：3 团大直径径向渐变，blur 90px，screen 叠加，沿对角线扫过 */}
      <AbsoluteFill style={{ pointerEvents: 'none' }}>
        {blobs.map((b, i) => (
          <div
            key={i}
            style={{
              position: 'absolute',
              left: cx + b.dx - b.d / 2,
              top: cy + b.dy - b.d / 2,
              width: b.d,
              height: b.d,
              borderRadius: '50%',
              background: `radial-gradient(circle, ${b.color} 0%, ${b.color}cc 30%, transparent 68%)`,
              filter: 'blur(90px)',
              mixBlendMode: 'screen',
              opacity: b.alpha * intensity,
            }}
          />
        ))}
        {/* 峰值核心过曝：光心一小团接近白的热核，峰值帧吞掉约七成画面 */}
        <div
          style={{
            position: 'absolute',
            left: cx - 550,
            top: cy - 550,
            width: 1100,
            height: 1100,
            borderRadius: '50%',
            background: 'radial-gradient(circle, #fff3dd 0%, #f6c878aa 45%, transparent 70%)',
            filter: 'blur(80px)',
            mixBlendMode: 'screen',
            opacity: intensity * intensity, // 只在临近峰值时才烧起来
          }}
        />
      </AbsoluteFill>
    </AbsoluteFill>
  );
};


// ===== demos/transition/transition-hidden-cut/VersusSlam.tsx =====
import React from 'react';
import { AbsoluteFill, Easing, interpolate, useCurrentFrame } from 'remotion';
import { FakeDashboard, TitleBlock, G } from '../../_fixtures/Fixtures';

// versus-slam 对撞开屏：左右两个半屏画面（带 78° 斜切边）从画外加速对冲，
// 沿斜缝砰地撞合；撞击帧白闪 + 整机震屏指数衰减 + "VS" 字块盖章压出，结尾静止 hold。
const IMPACT = 30; // 撞击帧（前 20f 建立 hold + 10f ease-in 对冲）

// 斜缝几何：78° 斜边 → 1080 高度上水平偏移 1080/tan(78°) ≈ 230px，中线 x=960 ±115
const SEAM_TOP_X = 1075; // 缝顶端 x
const SEAM_BOT_X = 845; // 缝底端 x
// CSS 旋转顺时针为正：缝顶端偏右（1075 > 845）→ 正角度 ≈ +12°
const SEAM_DEG = (Math.atan2(SEAM_TOP_X - SEAM_BOT_X, 1080) * 180) / Math.PI;

export const VersusSlam: React.FC = () => {
  const frame = useCurrentFrame();

  // 两半屏对冲：ease-in 加速，10f 从 ±1200px 冲到位
  const leftX = interpolate(frame, [20, IMPACT], [-1200, 0], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.in(Easing.cubic),
  });
  const rightX = -leftX;

  // 撞击帧起：整机震屏 12px 指数衰减（约 5f 收干）
  const since = frame - IMPACT;
  const env = since >= 0 ? 12 * Math.exp(-since / 1.6) : 0;
  const shakeX = env * Math.sin(since * 3.4);
  const shakeY = env * 0.6 * Math.sin(since * 4.1 + 0.7);

  // 白闪：撞击帧 0.9 → 0，3f 收掉
  const flash = interpolate(frame, [IMPACT, IMPACT + 3], [0.9, 0], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
  });

  // "VS" 盖章：scale 1.6 → 1 带 back overshoot，6f 压出
  const vsScale = interpolate(frame, [IMPACT, IMPACT + 6], [1.6, 1], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
    easing: Easing.out(Easing.back(2.6)),
  });
  const vsOpacity = interpolate(frame, [IMPACT, IMPACT + 2], [0, 1], {
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp',
  });

  const impacted = frame >= IMPACT;

  return (
    <AbsoluteFill style={{ background: G.bg, overflow: 'hidden' }}>
      <div style={{ position: 'absolute', inset: 0, transform: `translate(${shakeX}px, ${shakeY}px)` }}>
        {/* 建立段的斜缝虚线预示（撞合后被实缝替代） */}
        {!impacted && (
          <svg width={1920} height={1080} style={{ position: 'absolute', inset: 0 }}>
            <line
              x1={SEAM_TOP_X} y1={0} x2={SEAM_BOT_X} y2={1080}
              stroke={G.bar} strokeWidth={4} strokeDasharray="18 16"
            />
          </svg>
        )}
        {/* 左半屏：FakeDashboard A 裁左半，斜边 78° */}
        <div style={{
          position: 'absolute', inset: 0,
          transform: `translateX(${leftX}px)`,
          clipPath: `polygon(0px 0px, ${SEAM_TOP_X}px 0px, ${SEAM_BOT_X}px 1080px, 0px 1080px)`,
        }}>
          <FakeDashboard variant="A" />
        </div>
        {/* 右半屏：FakeDashboard B 裁右半 */}
        <div style={{
          position: 'absolute', inset: 0,
          transform: `translateX(${rightX}px)`,
          clipPath: `polygon(${SEAM_TOP_X}px 0px, 1920px 0px, 1920px 1080px, ${SEAM_BOT_X}px 1080px)`,
        }}>
          <FakeDashboard variant="B" />
        </div>
        {/* 撞合后的实体斜缝条 */}
        {impacted && (
          <div style={{
            position: 'absolute', left: 960 - 6, top: 540 - 700,
            width: 12, height: 1400, background: G.ink,
            transform: `rotate(${SEAM_DEG}deg)`,
          }} />
        )}
        {/* "VS" 字块盖章：贴缝、随缝倾斜 */}
        {impacted && (
          <div style={{
            position: 'absolute', left: 960, top: 540,
            transform: `translate(-50%, -50%) rotate(${SEAM_DEG}deg) scale(${vsScale})`,
            opacity: vsOpacity,
            background: G.card, border: `6px solid ${G.ink}`, borderRadius: 20,
            padding: '18px 46px', boxShadow: '0 18px 60px rgba(0,0,0,0.35)',
          }}>
            <TitleBlock text="VS" size={140} />
          </div>
        )}
      </div>
      {/* 撞击白闪（不随震屏位移） */}
      <AbsoluteFill style={{ background: '#ffffff', opacity: flash, pointerEvents: 'none' }} />
    </AbsoluteFill>
  );
};