/* ==========================================================================
   SpineViewer 插件介绍网站脚本
   - 主题切换、图片放大、滚动出现
   - 查看器交互演示：官方 Raptor 示例（Spine 4.3.75-beta 导出）
     仅支持 Spine 4.3：使用 4.3 官方运行时 + 插件同款 WebGL 光栅化器，
     WebGL 不可用时自动回退到 Canvas（与插件查看器的回退行为相同）。
   ========================================================================== */
(function () {
	'use strict';

	var root = document.documentElement;
	var viewerEl = document.getElementById('viewerDemo');

	function clamp(v, min, max) { return Math.min(max, Math.max(min, v)); }

	/* ---------------- 主题切换 ---------------- */

	var themeToggle = document.getElementById('themeToggle');
	if (themeToggle) {
		themeToggle.addEventListener('click', function () {
			var next = root.dataset.theme === 'dark' ? 'light' : 'dark';
			root.dataset.theme = next;
			try { localStorage.setItem('sv-site-theme', next); } catch (e) {}
			refreshViewerColors();
		});
	}

	/* ---------------- 滚动出现（带兜底，内容不会一直隐藏） ---------------- */

	var revealEls = Array.prototype.slice.call(document.querySelectorAll('.reveal'));
	var revealTick = 0;

	function revealInViewport() {
		var vh = window.innerHeight || document.documentElement.clientHeight;
		for (var i = 0; i < revealEls.length; i++) {
			var el = revealEls[i];
			if (el.classList.contains('visible')) continue;
			var rect = el.getBoundingClientRect();
			if (rect.top < vh * 0.92 && rect.bottom > 0) el.classList.add('visible');
		}
	}

	function revealAll() {
		revealEls.forEach(function (el) { el.classList.add('visible'); });
	}

	function scheduleReveal() {
		if (revealTick) return;
		revealTick = window.requestAnimationFrame(function () {
			revealTick = 0;
			revealInViewport();
		});
	}

	revealInViewport();
	window.addEventListener('scroll', scheduleReveal, { passive: true });
	window.addEventListener('resize', scheduleReveal);
	document.addEventListener('visibilitychange', function () {
		if (document.visibilityState === 'visible') revealInViewport();
	});
	// 兜底：后台标签页 / 未触发滚动时，稍后也把全部内容显示出来
	setTimeout(revealAll, 2000);

	/* ---------------- 图片放大 ---------------- */

	var lightbox = document.getElementById('lightbox');
	var lightboxImg = lightbox ? lightbox.querySelector('img') : null;

	function closeLightbox() {
		if (!lightbox || lightbox.hidden) return;
		lightbox.hidden = true;
		lightboxImg.removeAttribute('src');
		document.body.style.overflow = '';
	}

	if (lightbox) {
		Array.prototype.forEach.call(document.querySelectorAll('img.zoomable'), function (img) {
			img.addEventListener('click', function () {
				lightboxImg.src = img.currentSrc || img.src;
				lightboxImg.alt = img.alt || '';
				lightbox.hidden = false;
				document.body.style.overflow = 'hidden';
			});
		});
		lightbox.addEventListener('click', closeLightbox);
		window.addEventListener('keydown', function (e) {
			if (e.key === 'Escape') closeLightbox();
		});
	}

	/* ====================================================================
	   查看器交互演示（官方 Raptor 示例 · Spine 4.3 运行时渲染）
	   ==================================================================== */

	if (!viewerEl) return;

	var spine = window.spine;
	var svLibs = window.__svLibs || {};
	var FPS = 30;
	var EPS = 1e-6;
	var RUNTIME_DIR = '4.3'; // 演示只使用 4.3
	var DEFAULT_ANIMATION = 'walk';
	var DEMO_FILES = {
		json: 'assets/demo/raptor/raptor-pro.json',
		atlas: 'assets/demo/raptor/raptor.atlas',
		texture: 'assets/demo/raptor/raptor.png'
	};

	var stageEl = document.getElementById('demoStage');
	var canvas = document.getElementById('demoCanvas');
	var ctx = canvas.getContext('2d');

	var playBtn = document.getElementById('demoPlay');
	var loopCheck = document.getElementById('demoLoop');
	var speedRange = document.getElementById('demoSpeed');
	var speedVal = document.getElementById('demoSpeedVal');
	var bgCheck = document.getElementById('demoBg');
	var reloadBtn = document.getElementById('demoReload');
	var skinSelect = document.getElementById('demoSkin');
	var animListEl = document.getElementById('demoAnimList');
	var statusEl = document.getElementById('demoStatus');
	var durationEl = document.getElementById('demoDuration');
	var rulerEl = document.getElementById('demoRuler');
	var timelineEl = document.getElementById('demoTimeline');
	var keysEl = document.getElementById('demoKeys');
	var readoutEl = document.getElementById('demoReadout');
	var versionEl = document.getElementById('demoVersion');

	var state = {
		playing: true,
		loop: true,
		speed: 1,
		background: false,
		seeking: false,
		animIndex: 0,
		panX: 0,
		panY: 0,
		zoom: 1
	};

	if (window.matchMedia && window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
		state.playing = false;
	}

	var runtime = {
		data: null,
		skeleton: null,
		animState: null,
		atlas: null,
		texture: null,
		renderer: null,
		canvasOnly: false,
		ready: false,
		loading: false
	};

	var colors = { bg: '#1e1e1e' };
	var dpr = 1;
	var fitScale = 1, fitCx = 0, fitCy = 0;
	var statusTimer = 0;
	var drawErrorReported = false;
	var lastFrameTime = performance.now();
	var needsDraw = true;   // 暂停或没有交互时不再重绘
	var frameHandle = 0;    // rAF 句柄：空闲时停止循环，避免持续占用 CPU

	// 需要重绘时唤醒渲染循环
	function wake() {
		needsDraw = true;
		if (!frameHandle) frameHandle = requestAnimationFrame(tick);
	}

	function refreshViewerColors() {
		var cs = getComputedStyle(viewerEl);
		colors.bg = (cs.getPropertyValue('--v-bg') || '#1e1e1e').trim();
		wake();
	}

	// 控制画布总像素，避免高分辨率屏上占用过多显存
	function pickDpr(width, height) {
		var value = Math.min(window.devicePixelRatio || 1, 2);
		var maxPixels = 900000;
		if (width > 0 && height > 0 && width * height * value * value > maxPixels) {
			value = Math.max(1, Math.sqrt(maxPixels / (width * height)));
		}
		return value;
	}

	/* ---------------- 状态提示 ---------------- */

	function setStatus(message, holdMs) {
		statusEl.textContent = message;
		statusEl.classList.add('show');
		clearTimeout(statusTimer);
		statusTimer = 0;
		if (holdMs > 0 && isFinite(holdMs)) {
			statusTimer = setTimeout(function () { statusEl.classList.remove('show'); }, holdMs);
		}
	}

	/* ---------------- 时间与刻度（与查看器同算法） ---------------- */

	function frameOf(seconds) { return Math.round((seconds || 0) * FPS); }

	function formatSeconds(seconds) {
		var value = Math.max(0, Number(seconds) || 0);
		if (value < 10) return value.toFixed(2) + ' 秒';
		if (value < 60) return value.toFixed(1) + ' 秒';
		var minutes = Math.floor(value / 60);
		return minutes + ':' + (value % 60).toFixed(1).padStart(4, '0');
	}

	function niceTickInterval(totalSeconds) {
		var target = totalSeconds / 8;
		var choices = [1 / 30, 0.1, 0.2, 0.5, 1, 2, 5, 10, 15, 30, 60, 120, 300, 600];
		for (var i = 0; i < choices.length; i++) {
			if (choices[i] >= target) return choices[i];
		}
		return Math.pow(10, Math.ceil(Math.log10(target)));
	}

	function currentAnimation() {
		if (!runtime.data || !runtime.data.animations) return null;
		return runtime.data.animations[state.animIndex] || null;
	}

	function animationDuration(anim) {
		if (!anim) return 0;
		var declared = Number(anim.duration);
		if (Number.isFinite(declared) && declared > EPS) return declared;
		var times = collectKeyframeTimes(anim);
		return times.length ? Math.max.apply(null, times) : 0;
	}

	function isStatic() { return animationDuration(currentAnimation()) <= EPS; }

	function snapTimeToFrame(seconds) {
		var duration = animationDuration(currentAnimation());
		var lastFrame = Math.max(0, frameOf(duration));
		var frame = clamp(Math.round((Number(seconds) || 0) * FPS), 0, lastFrame);
		return frame / FPS;
	}

	// 与查看器一致：收集各 timeline 的关键帧时间
	function collectKeyframeTimes(anim) {
		if (!anim || !anim.timelines) return [];
		var times = new Set();
		for (var i = 0; i < anim.timelines.length; i++) {
			var tl = anim.timelines[i];
			var frames = tl && tl.frames;
			if (!frames || !frames.length) continue;
			try {
				if (Array.isArray(frames[0])) {
					for (var f = 0; f < frames.length; f++) {
						var frame = frames[f];
						if (frame && Number.isFinite(frame[0])) times.add(frame[0]);
					}
					continue;
				}
				var frameCount = typeof tl.getFrameCount === 'function' ? tl.getFrameCount() : 0;
				var entries = typeof tl.getFrameEntries === 'function'
					? tl.getFrameEntries()
					: (frameCount > 0 ? Math.max(1, Math.round(frames.length / frameCount)) : 1);
				for (var k = 0; k < frameCount; k++) {
					var value = frames[k * entries];
					if (Number.isFinite(value)) times.add(value);
				}
			} catch (e) { /* 忽略异常的 timeline */ }
		}
		return Array.from(times).filter(function (time) { return time >= 0; }).sort(function (a, b) { return a - b; });
	}

	function renderTimeRuler() {
		rulerEl.innerHTML = '';
		var duration = animationDuration(currentAnimation());
		if (duration <= EPS) {
			var staticLabel = document.createElement('span');
			staticLabel.className = 'tick-label first';
			staticLabel.style.left = '0%';
			staticLabel.textContent = '0 秒（静帧）';
			rulerEl.appendChild(staticLabel);
			return;
		}
		var major = niceTickInterval(duration);
		var minor = major / 5;
		var count = Math.floor(duration / minor);
		// 窄屏下隔一个主刻度显示标签，避免文字互相叠压
		var skipLabels = rulerEl.clientWidth > 0 && rulerEl.clientWidth < 430 ? 2 : 1;
		for (var i = 0; i <= count; i++) {
			var value = Math.min(i * minor, duration);
			var percent = (value / duration) * 100;
			var isMajor = i % 5 === 0 || Math.abs(value - duration) < 1e-8;
			var tick = document.createElement('span');
			tick.className = 'tick' + (isMajor ? ' major' : '');
			tick.style.left = percent + '%';
			rulerEl.appendChild(tick);
			if (isMajor) {
				var isEnd = Math.abs(value - duration) < 1e-8;
				if (!isEnd && (i / 5) % skipLabels !== 0) continue;
				var label = document.createElement('span');
				label.className = 'tick-label' + (i === 0 ? ' first' : (isEnd ? ' last' : ''));
				label.style.left = percent + '%';
				label.textContent = value < 10 ? value.toFixed(1) + 's' : Math.round(value) + 's';
				rulerEl.appendChild(label);
			}
			if (Math.abs(value - duration) < 1e-8) break;
		}
		if (Math.abs(duration / minor - Math.round(duration / minor)) > 1e-8) {
			var endTick = document.createElement('span');
			endTick.className = 'tick major';
			endTick.style.left = '100%';
			rulerEl.appendChild(endTick);
			var endLabel = document.createElement('span');
			endLabel.className = 'tick-label last';
			endLabel.style.left = '100%';
			endLabel.textContent = duration < 10 ? duration.toFixed(2) + 's' : duration.toFixed(1) + 's';
			rulerEl.appendChild(endLabel);
		}
	}

	function renderKeyframes() {
		keysEl.innerHTML = '';
		var anim = currentAnimation();
		var duration = animationDuration(anim);
		if (!anim) return;
		if (duration <= EPS) {
			var span = document.createElement('span');
			span.style.left = '0%';
			span.title = '静帧姿势 · 第 1 帧';
			keysEl.appendChild(span);
			return;
		}
		var sorted = collectKeyframeTimes(anim).filter(function (time) { return time <= duration; });
		// 限制数量，避免过多标记
		var maxMarkers = 200;
		var step = Math.max(1, Math.ceil(sorted.length / maxMarkers));
		for (var i = 0; i < sorted.length; i += step) {
			var keyframeTime = sorted[i];
			var mark = document.createElement('span');
			mark.style.left = (keyframeTime / duration) * 100 + '%';
			mark.title = '关键帧 · ' + formatSeconds(keyframeTime) + ' · 第 ' + frameOf(keyframeTime) + ' 帧';
			keysEl.appendChild(mark);
		}
	}

	// 仅支持 4.3：轨道查询使用 getTrack
	function trackEntry() {
		return runtime.animState ? (runtime.animState.getTrack(0) || null) : null;
	}

	function currentTrackTime() {
		var entry = trackEntry();
		if (!entry) return 0;
		var raw = Number.isFinite(entry.trackTime) ? entry.trackTime : 0;
		var duration = animationDuration(currentAnimation());
		if (state.loop && duration > EPS) return raw % duration;
		return Math.max(0, Math.min(raw, duration));
	}

	function updateReadout() {
		var duration = animationDuration(currentAnimation());
		if (duration <= EPS) {
			readoutEl.textContent = '静帧 · 1 / 1 帧';
			if (!state.seeking) timelineEl.value = '0';
			return;
		}
		var time = clamp(currentTrackTime(), 0, duration);
		readoutEl.textContent = formatSeconds(time) + ' / ' + formatSeconds(duration) +
			' · ' + frameOf(time) + ' / ' + frameOf(duration) + ' 帧';
		if (!state.seeking) timelineEl.value = String(clamp(time / duration, 0, 1));
	}

	function updatePlayButton() {
		if (!runtime.ready || isStatic()) {
			playBtn.textContent = runtime.ready ? '▮ 静帧' : '⏸ 暂停';
			playBtn.disabled = true;
			return;
		}
		playBtn.disabled = false;
		playBtn.textContent = state.playing ? '⏸ 暂停' : '▶ 播放';
	}

	function updateTimelineUI() {
		var duration = animationDuration(currentAnimation());
		var staticAnim = duration <= EPS;
		durationEl.textContent = staticAnim
			? '静帧 · 1 帧'
			: '时长 ' + formatSeconds(duration) + ' · ' + frameOf(duration) + ' 帧';
		timelineEl.disabled = staticAnim;
		timelineEl.value = '0';
		updatePlayButton();
		renderTimeRuler();
		renderKeyframes();
		updateReadout();
	}

	function highlightAnimationItem() {
		Array.prototype.forEach.call(animListEl.children, function (item, i) {
			item.classList.toggle('active', i === state.animIndex);
			item.setAttribute('aria-selected', i === state.animIndex ? 'true' : 'false');
		});
	}

	function selectAnimation(index) {
		state.animIndex = index;
		var anim = currentAnimation();
		if (runtime.animState && anim) {
			var entry = runtime.animState.setAnimation(0, anim.name, state.loop);
			if (entry) entry.loop = state.loop;
		}
		highlightAnimationItem();
		updateTimelineUI();
		wake();
	}

	/* ---------------- 骨架姿态与世界变换（4.3 API） ---------------- */

	function updateWorld() {
		if (runtime.skeleton) runtime.skeleton.updateWorldTransform(spine.Physics.update);
	}

	function applyPose() {
		if (!runtime.animState || !runtime.skeleton) return;
		runtime.animState.apply(runtime.skeleton);
		updateWorld();
	}

	function getBounds(sk) {
		if (!sk || typeof sk.getBoundsRect !== 'function') return null;
		var rect = sk.getBoundsRect();
		if (!rect || !(rect.width > 0) || !(rect.height > 0)) return null;
		return { x: rect.x, y: rect.y, width: rect.width, height: rect.height };
	}

	function fitToCanvas() {
		if (!runtime.skeleton) return;
		var bundle = getBounds(runtime.skeleton);
		var cw = canvas.clientWidth, ch = canvas.clientHeight;
		if (!bundle || !cw || !ch) {
			fitScale = 1; fitCx = 0; fitCy = 0;
			return;
		}
		// 自动适配并居中；顶部控制栏与底部时间轴是浮动面板，按其实际高度留出空间
		var toolbarEl = viewerEl.querySelector('.v-toolbar');
		var timelineBar = viewerEl.querySelector('.v-timeline');
		var padTop = (toolbarEl ? toolbarEl.offsetHeight : 46) + 24;
		var padBottom = (timelineBar ? timelineBar.offsetHeight : 68) + 24;
		var pad = 0.06;
		var availW = cw * (1 - pad * 2);
		var availH = Math.max(60, ch - padTop - padBottom);
		var scale = Math.min(availW / bundle.width, availH / bundle.height);
		fitScale = (isFinite(scale) && scale > 0) ? scale : 1;
		fitCx = bundle.x + bundle.width / 2;
		fitCy = bundle.y + bundle.height / 2 - ((padBottom - padTop) / 2) / fitScale;
	}

	/* ---------------- 渲染 ---------------- */

	function buildRenderer(context, allowWebGL) {
		if (!svLibs.clipping || typeof svLibs.clipping.createRenderer !== 'function') throw new Error('渲染模块未加载');
		var renderer;
		if (allowWebGL) {
			renderer = svLibs.clipping.createRenderer(spine, context, RUNTIME_DIR);
		} else {
			// 临时停用 WebGL 光栅化附着，得到纯 Canvas 渲染器
			var rasterizer = svLibs.rasterizer || {};
			var originalAttach = rasterizer.attach;
			rasterizer.attach = function (r) { return r; };
			try { renderer = svLibs.clipping.createRenderer(spine, context, RUNTIME_DIR); }
			finally { if (originalAttach) rasterizer.attach = originalAttach; }
		}
		// 示例为普通 Alpha 导出（atlas 未标注 pma），预乘保持关闭
		renderer.premultipliedAlpha = false;
		return renderer;
	}

	function drawSkeletonSafely() {
		try {
			runtime.renderer.draw(runtime.skeleton);
		} catch (e) {
			if (!runtime.canvasOnly) {
				// WebGL 光栅化不可用（缺少 WebGL、纹理受限等）时回退到 Canvas 路径
				runtime.canvasOnly = true;
				console.warn('WebGL 光栅化不可用，已回退到 Canvas 渲染：', (e && e.message) || e);
				try { if (runtime.renderer && runtime.renderer.dispose) runtime.renderer.dispose(); } catch (e2) { /* ignore */ }
				runtime.renderer = buildRenderer(ctx, false);
				runtime.renderer.draw(runtime.skeleton);
				return;
			}
			if (!drawErrorReported) {
				drawErrorReported = true;
				console.error(e);
				setStatus('渲染失败：' + ((e && e.message) || e), 0);
			}
		}
	}

	function draw() {
		var cw = canvas.clientWidth, ch = canvas.clientHeight;
		if (!cw || !ch) return;
		var pixelWidth = Math.round(cw * dpr), pixelHeight = Math.round(ch * dpr);
		if (canvas.width !== pixelWidth) canvas.width = pixelWidth;
		if (canvas.height !== pixelHeight) canvas.height = pixelHeight;

		ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
		ctx.clearRect(0, 0, cw, ch);
		ctx.fillStyle = colors.bg;
		ctx.fillRect(0, 0, cw, ch);
		if (!runtime.ready || !runtime.skeleton || !runtime.renderer) return;

		// 与查看器相同：居中 + 缩放 + Y 翻转；panX/panY 为屏幕坐标偏移
		var scale = fitScale * state.zoom;
		ctx.save();
		ctx.translate(cw / 2 + state.panX, ch / 2 + state.panY);
		ctx.scale(scale, -scale);
		ctx.translate(-fitCx, -fitCy);
		if (state.background && svLibs.background) {
			svLibs.background.drawCheckerboard(ctx, canvas.width, canvas.height);
		}
		drawSkeletonSafely();
		ctx.restore();
	}

	/* ---------------- 主循环 ---------------- */

	function tick(now) {
		frameHandle = 0;
		var dt = Math.min(0.05, (now - lastFrameTime) / 1000);
		lastFrameTime = now;

		var advancing = false;
		if (runtime.ready) {
			var duration = animationDuration(currentAnimation());
			advancing = state.playing && !state.seeking && state.speed > 0 && duration > EPS;
			runtime.animState.timeScale = advancing ? state.speed : 0;
			runtime.animState.update(dt);
			runtime.animState.apply(runtime.skeleton);
			updateWorld();
			if (advancing) needsDraw = true;

			// 非循环播放到结尾时停止推进（与查看器行为一致）
			var entry = trackEntry();
			if (entry && !state.loop && duration > EPS && entry.trackTime >= duration - 1e-4 && state.playing) {
				state.playing = false;
				updatePlayButton();
				needsDraw = true;
				advancing = false;
			}
		}

		if (needsDraw) {
			draw();
			updateReadout();
			needsDraw = false;
		}
		// 播放中持续刷新；暂停或空闲时停在这里，等待 wake() 唤醒
		if (advancing) frameHandle = requestAnimationFrame(tick);
	}

	/* ---------------- 控件事件 ---------------- */

	function togglePlay() {
		if (!runtime.ready || isStatic()) return;
		var duration = animationDuration(currentAnimation());
		var entry = trackEntry();
		// 播放到结尾后再次播放：从头发起
		if (!state.playing && entry && duration > EPS && entry.trackTime >= duration - 1e-4) {
			var anim = currentAnimation();
			runtime.animState.setAnimation(0, anim.name, state.loop);
			var next = trackEntry();
			if (next) next.loop = state.loop;
		}
		state.playing = !state.playing;
		updatePlayButton();
		wake();
	}

	playBtn.addEventListener('click', togglePlay);

	loopCheck.addEventListener('change', function () {
		state.loop = loopCheck.checked;
		var entry = trackEntry();
		if (entry) entry.loop = state.loop;
	});

	speedRange.addEventListener('input', function () {
		state.speed = Number(speedRange.value);
		speedVal.textContent = state.speed.toFixed(1) + 'x';
	});

	bgCheck.addEventListener('change', function () {
		state.background = bgCheck.checked;
		wake();
	});

	skinSelect.addEventListener('change', function () {
		if (!runtime.skeleton) return;
		runtime.skeleton.setSkinByName(skinSelect.value);
		runtime.skeleton.setupPoseSlots();
		setStatus('皮肤：' + skinSelect.value, 1600);
		wake();
	});

	reloadBtn.addEventListener('click', function () {
		state.panX = 0;
		state.panY = 0;
		state.zoom = 1;
		if (runtime.ready) {
			selectAnimation(state.animIndex);
			fitToCanvas();
		}
		setStatus('已重新加载目录', 1800);
	});

	// 时间轴：拖动时暂停推进，并按帧对齐（与查看器一致）
	timelineEl.addEventListener('pointerdown', function () { state.seeking = true; });
	timelineEl.addEventListener('input', function () {
		if (!runtime.ready || isStatic()) return;
		state.seeking = true;
		var duration = animationDuration(currentAnimation());
		var time = snapTimeToFrame(Number(timelineEl.value) * duration);
		var entry = trackEntry();
		if (entry) entry.trackTime = time;
		applyPose();
		updateReadout();
		wake();
	});
	timelineEl.addEventListener('change', function () { state.seeking = false; });
	window.addEventListener('pointerup', function () { state.seeking = false; });

	// 画布：左键拖拽平移，滚轮缩放，右键回到中心
	var dragging = false, dragX = 0, dragY = 0, startPanX = 0, startPanY = 0;

	stageEl.addEventListener('pointerdown', function (e) {
		if (e.button !== 0) return;
		dragging = true;
		dragX = e.clientX;
		dragY = e.clientY;
		startPanX = state.panX;
		startPanY = state.panY;
		stageEl.classList.add('dragging');
		if (stageEl.setPointerCapture) stageEl.setPointerCapture(e.pointerId);
	});

	stageEl.addEventListener('pointermove', function (e) {
		if (!dragging) return;
		state.panX = startPanX + (e.clientX - dragX);
		state.panY = startPanY + (e.clientY - dragY);
		wake();
	});

	function endDrag() {
		dragging = false;
		stageEl.classList.remove('dragging');
	}

	stageEl.addEventListener('pointerup', endDrag);
	stageEl.addEventListener('pointercancel', endDrag);

	stageEl.addEventListener('wheel', function (e) {
		e.preventDefault();
		state.zoom = clamp(state.zoom * Math.exp(-e.deltaY * 0.0012), 0.3, 6);
		wake();
	}, { passive: false });

	stageEl.addEventListener('contextmenu', function (e) {
		e.preventDefault();
		state.panX = 0;
		state.panY = 0;
		state.zoom = 1;
		wake();
		setStatus('已回到画布中心', 1600);
	});

	// 空格：鼠标悬停或演示区聚焦时播放/暂停
	var hovering = false;
	viewerEl.addEventListener('pointerenter', function () { hovering = true; });
	viewerEl.addEventListener('pointerleave', function () { hovering = false; });

	window.addEventListener('keydown', function (e) {
		if (e.code !== 'Space' && e.key !== ' ') return;
		var active = document.activeElement;
		if (active && viewerEl.contains(active) && active !== viewerEl && active.closest('button, select, input, summary, a')) return;
		if (!hovering && (!active || !viewerEl.contains(active))) return;
		e.preventDefault();
		togglePlay();
	});

	/* ---------------- 示例数据加载 ---------------- */

	function loadImage(src) {
		return new Promise(function (resolve, reject) {
			var image = new Image();
			image.onload = function () { resolve(image); };
			image.onerror = function () { reject(new Error('贴图加载失败')); };
			image.src = src;
		});
	}

	function fetchText(url) {
		return fetch(url).then(function (response) {
			if (!response.ok) throw new Error('HTTP ' + response.status);
			return response.text();
		});
	}

	// 内嵌副本按需加载：file:// 或原始文件读取失败时才会用到
	function ensureEmbeddedData() {
		if (window.SPINE_DEMO_DATA) return Promise.resolve(window.SPINE_DEMO_DATA);
		return new Promise(function (resolve, reject) {
			var script = document.createElement('script');
			script.src = 'assets/demo/raptor/embedded.js';
			script.onload = function () {
				if (window.SPINE_DEMO_DATA) resolve(window.SPINE_DEMO_DATA);
				else reject(new Error('缺少内嵌示例数据'));
			};
			script.onerror = function () { reject(new Error('缺少内嵌示例数据')); };
			document.head.appendChild(script);
		});
	}

	// http 环境读取同目录下的原始文件；file:// 下浏览器禁止 fetch 本地文本，改用内嵌副本
	function loadDemoData() {
		if (location.protocol === 'file:') {
			return ensureEmbeddedData().then(function (embedded) {
				return { data: embedded.data, atlas: embedded.atlas, texture: embedded.texture || DEMO_FILES.texture, source: 'embedded' };
			});
		}
		return Promise.all([fetchText(DEMO_FILES.json), fetchText(DEMO_FILES.atlas)]).then(function (texts) {
			return { data: JSON.parse(texts[0]), atlas: texts[1], texture: DEMO_FILES.texture, source: 'file' };
		}).catch(function () {
			return ensureEmbeddedData().then(function (embedded) {
				return { data: embedded.data, atlas: embedded.atlas, texture: embedded.texture || DEMO_FILES.texture, source: 'embedded' };
			});
		});
	}

	function fillSkinSelect() {
		skinSelect.innerHTML = '';
		var skins = (runtime.data && runtime.data.skins) || [];
		skins.forEach(function (skin) {
			var option = document.createElement('option');
			option.value = skin.name;
			option.textContent = skin.name;
			skinSelect.appendChild(option);
		});
		skinSelect.disabled = skins.length === 0;
	}

	function fillAnimationList() {
		animListEl.innerHTML = '';
		var animations = (runtime.data && runtime.data.animations) || [];
		animations.forEach(function (anim, i) {
			var item = document.createElement('button');
			item.type = 'button';
			item.className = 'v-anim-item';
			item.textContent = anim.name;
			item.title = anim.name;
			item.setAttribute('role', 'option');
			item.setAttribute('aria-selected', 'false');
			item.addEventListener('click', function () { selectAnimation(i); });
			animListEl.appendChild(item);
		});
	}

	async function initDemo() {
		if (runtime.ready || runtime.loading) return;
		runtime.loading = true;
		setStatus('正在加载官方示例 Raptor…', 0);
		try {
			if (!spine || typeof spine.SkeletonJson !== 'function') throw new Error('Spine 运行时未加载');
			var payload = await loadDemoData();
			var image = await loadImage(payload.texture);

			runtime.texture = new spine.CanvasTexture(image);
			// 仅支持 4.3：TextureAtlas 构造器只接收文本，纹理通过 page.setTexture 绑定
			runtime.atlas = new spine.TextureAtlas(payload.atlas);
			for (var p = 0; p < runtime.atlas.pages.length; p++) {
				runtime.atlas.pages[p].setTexture(runtime.texture);
			}
			var skeletonJson = new spine.SkeletonJson(new spine.AtlasAttachmentLoader(runtime.atlas));
			runtime.data = skeletonJson.readSkeletonData(payload.data);
			runtime.skeleton = new spine.Skeleton(runtime.data);
			runtime.animState = new spine.AnimationState(new spine.AnimationStateData(runtime.data));
			runtime.renderer = buildRenderer(ctx, true);

			// 默认皮肤：优先使用数据声明的默认皮肤，没有则用列表第一个
			var defaultSkin = runtime.data.defaultSkin || (runtime.data.skins && runtime.data.skins[0]) || null;
			fillSkinSelect();
			if (defaultSkin) {
				runtime.skeleton.setSkin(defaultSkin);
				skinSelect.value = defaultSkin.name;
			}
			runtime.skeleton.setupPoseSlots();

			fillAnimationList();
			// 默认播放 walk
			var walkIndex = 0;
			for (var i = 0; i < runtime.data.animations.length; i++) {
				if (runtime.data.animations[i].name === DEFAULT_ANIMATION) { walkIndex = i; break; }
			}
			state.animIndex = walkIndex;
			selectAnimation(walkIndex);
			// 与查看器一致：先应用姿态并更新世界变换，再按包围盒自动适配
			applyPose();

			versionEl.textContent = 'Spine ' + (runtime.data.version || '');
			runtime.ready = true;
			dpr = pickDpr(canvas.clientWidth, canvas.clientHeight);
			fitToCanvas();
			updateTimelineUI();
			wake();
			setStatus('已加载官方示例 Raptor · ' + runtime.data.animations.length + ' 个动画 · ' +
				(payload.source === 'embedded' ? '内嵌数据' : '本地文件'), 3200);
		} catch (e) {
			console.error(e);
			setStatus('示例加载失败：' + ((e && e.message) || e), 0);
		} finally {
			runtime.loading = false;
		}
	}

	/* ---------------- 尺寸与启动 ---------------- */

	function resize() {
		dpr = pickDpr(canvas.clientWidth, canvas.clientHeight);
		fitToCanvas();
		renderTimeRuler(); // 宽度变化时重新决定刻度标签密度
		wake();
	}

	if ('ResizeObserver' in window) {
		new ResizeObserver(resize).observe(stageEl);
	} else {
		window.addEventListener('resize', resize);
	}

	refreshViewerColors();
	dpr = pickDpr(canvas.clientWidth, canvas.clientHeight);
	updatePlayButton();
	wake();
	initDemo();
})();