/**
 * __theming-probe — the before/after computed-style probe of PLAN-theming §7.2/§7.4.
 *
 *   node scripts/__theming-probe.ts <component> <out.json> [url]
 *
 * Temporary instrument (the `__` prefix keeps it out of the tracked surface).
 * Walks the component demo, and for every node matching `[data-{c}…]` records
 * the knob computed values at rest, per size, hovered and focused. The size is
 * forced by WRITING `data-size` on the nodes that already carry it — the recipe
 * selects on that attribute, so the computed result is the same one the real
 * interaction produces, without depending on each demo's chips.
 *
 * Run it with plain `node`, NOT with tsx: the tsx loader injects helpers that
 * are not defined inside `page.evaluate`, and every probe throws.
 *
 * Must run from the repo ROOT (playwright does not resolve from the scratchpad)
 * and against a live dev server; a hidden screen freezes rAF, so headless is the
 * reliable surface.
 */

import { writeFileSync } from 'node:fs';
import { chromium } from 'playwright';

const PROPS = [
	'backgroundColor',
	'backgroundImage',
	'color',
	'borderTopColor',
	'borderTopWidth',
	'borderTopLeftRadius',
	'borderBottomRightRadius',
	'paddingTop',
	'paddingRight',
	'paddingBottom',
	'paddingLeft',
	'rowGap',
	'columnGap',
	'fontSize',
	'fontWeight',
	'fontFamily',
	'lineHeight',
	'letterSpacing',
	'blockSize',
	'inlineSize',
	'minBlockSize',
	'minInlineSize',
	'boxShadow',
	'opacity',
	'fill',
	'stroke',
	'strokeWidth',
	'strokeOpacity',
	'outlineColor',
	'outlineWidth',
	'filter',
	'backdropFilter'
];

const SIZES = ['xs', 'sm', 'md', 'lg', 'xl'];

/**
 * Demo controls that must be ON before measuring: a part the demo does not
 * mount is a part the diff never compares, and a probe over two nodes passes
 * in false (the F2-B lesson — count the nodes before believing a green gate).
 * text-gradient boots with `showBorder=false`, so its whole frame — three of
 * its seven tokens — is absent from the default stage.
 */
/**
 * Components whose PARTS are not tagged `data-{c}-*`: prose styles bare HTML
 * (h1, code, table…) through `:where([data-prose] el)`, so the attribute filter
 * below sees exactly ONE node and the gate proves nothing. The selector's
 * matches join the measured set.
 */
const EXTRA_NODES: Record<string, string> = {
	prose: '[data-prose] *',
	// Its parts carry the MEDIA-PLAYER attrs (it is the audio skin of that
	// chassis, not a component with its own part names): the `data-audio-player`
	// filter matched ZERO nodes.
	'audio-player': '[data-media-player][data-variant], [data-media-player][data-variant] *',
	// Its SVG innards hook on CLASSES, not on `data-onion-*`: without this the
	// filter sees the five attribute nodes and misses every sector, label, icon
	// and glyph — the whole surface the recipe paints.
	'onion-menu': '.onion-menu-sector, .onion-menu-label, .onion-menu-icon, .onion-menu-icon svg, .onion-menu-trigger, .onion-menu-trigger-glyph',
	// Its mega-menu rows are the CONSUMER's bare `<a>` (the recipe styles them
	// through `[data-navigation-menu-content] :is(a, …)`), so the attribute
	// filter saw 10 nodes and NONE of them was the panel or a row — 9 of its 19
	// knobs were outside the diff. They only exist while the panel is open, so
	// the `open` pass below honours this selector too.
	'navigation-menu': '[data-navigation-menu-content] a',
	// Its interaction chrome IS an embedded canonical Slider that the recipe
	// re-tints (the thumb becomes the playhead): those nodes carry
	// `data-slider*`, so the attribute filter saw 4 nodes and none of them was
	// the playhead the recipe paints.
	waveform: '[data-waveform] [data-slider], [data-waveform] [data-slider] *',
	// The scrolling viewport is the composed VirtualList's (`data-virtual-list-viewport`),
	// so the two knobs the log paints on it — its inline/block padding — had no
	// node in the filter; the to-latest glyph is a bare `<svg>`.
	'chat-log':
		'[data-chat-log] [data-virtual-list-viewport], [data-chat-log-to-latest] svg, [data-chat-log-separator-day] > *',
	// Both glyphs are bare `<svg>` children of the parts that carry the attrs,
	// and the recipe sizes them by descendant selector.
	'chat-composer': '[data-chat-composer-send] > svg, [data-chat-composer-context-close] > svg',
	// A FAB is ONE node (the composed `<button>` carrying `data-fab`), so the
	// attribute filter saw a single node — the "count the nodes" flag. Its second
	// painted surface is the composed Button's icon slot, which the recipe sizes
	// by descendant selector (`[data-fab] [data-button-icon]`) and which carries
	// the Button's attr, not the FAB's.
	fab: '[data-fab] [data-button-icon]',
	// Its quick-reaction panel is PORTALED (the bar rides on `Popover.Content`
	// and the gap it paints sits on the composed `[data-popover-viewport]`), and
	// the add-reaction glyph is the composed `Icon` — a bare svg with `data-icon`.
	'chat-message':
		'[data-chat-message-quick-reactions] [data-popover-viewport], [data-chat-message-reaction-add] > svg',
	// Its three dots are bare `> span` children of the indicator: no attr of
	// their own, so the four knobs the recipe paints on them had no node.
	'chat-typing': '[data-chat-typing-indicator] > span, [data-chat-typing-avatars] > *'
};

/**
 * The trigger the OPEN pass must click. The default is the first trigger in the
 * document, which is wrong whenever the surface worth measuring hangs off
 * ANOTHER one: menubar drops a role=menu Content from its first entry and its
 * own role=dialog Panel — the part that carries its public knobs — only from
 * the "Format" entry.
 */
const OPEN_TRIGGER: Record<string, string> = {
	menubar: "[data-menubar-trigger][data-menubar-value='format']",
	// It has NO route of its own (`/uix/components/color-swatch` is a 404, the
	// fifth canon component in that state): it is measured on the color-picker
	// demo, whose stage mounts exactly ONE swatch (the trigger chip). Every other
	// swatch — presets and saved swatches, a dozen of them — lives in the
	// PORTALED panel, so the open pass is where the node count stops being 1.
	'color-swatch': '[data-color-picker-trigger]',
	// Its only openable surface is the quick-reaction tapback bar, hanging off
	// the add-reaction chip — the default `[data-{c}-trigger]` matches nothing.
	'chat-message': '[data-chat-message-reaction-add]'
};

const DEMO_VARIANTS: Record<string, string[]> = {
	// Its badge is OPT-IN and boots in DOT mode (no text frame), and its ring is
	// off: the probe saw 2 nodes — the portrait and its image — and neither the
	// chip nor the halo the recipe paints.
	avatar: [
		'[data-uix-control]:has([data-uix-control-label]:text-is("show badge")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("dot")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("ring")) [data-uix-chip]:text-is("solid")'
	],
	// It renders only in the media-player demo, after the `media: audio` chip.
	'audio-player': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("media")) [data-uix-chip]:text-is("audio")'
	],
	'text-gradient': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("showBorder")) [data-uix-chip]:text-is("true")'
	],
	// Its dot, icon and remove parts are OPT-IN switches, all off by default: the
	// probe saw 2 nodes (root + label) and none of the three parts the recipe
	// paints. They are checkboxes, not chips.
	badge: [
		'[data-uix-control]:has([data-uix-control-label]:text-is("dot")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("icon")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("removable")) input[type=checkbox]'
	],
	// It boots EMPTY (a FileUpload dropzone): the preview, the canvas, the
	// toolbar and the two icon buttons — every part the recipe paints — only
	// exist in the `ready` state. Without the sample chip the probe saw 1 node.
	'image-picker': ['[data-uix-chip]:text-is("Load sample image")'],
	// Its loading indicator — the part that carries EIGHT of its seventeen
	// tokens — renders only while `loading`, and the demo boots it off: 4 nodes.
	'search-field': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("loading")) input[type=checkbox]'
	],
	// Its context bar (ten tokens) and its attachment tray are OPT-IN: the demo
	// boots with neither, so the probe saw the shell and the send button only.
	'chat-composer': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("context")) [data-uix-chip]:text-is("reply")',
		'[data-uix-control]:has([data-uix-control-label]:text-is("simulate")) button:has-text("attach file")'
	],
	// Four of its twelve parts are OPT-IN and boot off: the quoted reply, the
	// read-receipt row, the delivery status (only rendered when `delivery` is
	// set) and the mention accent. Without them the probe saw 12 nodes and none
	// of the four surfaces the recipe paints there.
	'chat-message': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("reply (quote)")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("read-by")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("mentioned")) input[type=checkbox]',
		'[data-uix-control]:has([data-uix-control-label]:text-is("delivery")) [data-uix-chip]:text-is("read")'
	],
	// It boots with NOBODY typing, and idle hides every child (presence =
	// visibility, N-7): the row measured its three parts with `visibility:
	// hidden` and the avatars slot unmounted.
	'chat-typing': [
		'[data-uix-control]:has([data-uix-control-label]:text-is("typers")) [data-uix-chip]:text-is("Ada")'
	]
};

async function main() {
	const [component, out, urlArg] = process.argv.slice(2);
	if (!component || !out) throw new Error('usage: <component> <out.json> [url]');
	const url = urlArg ?? `http://localhost:5173/uix/components/${component}`;

	const browser = await chromium.launch();
	const page = await browser.newPage({ viewport: { width: 1440, height: 1000 } });

	// A demo that is still LOADING measures a different instant on every run:
	// feed's auto load-more keeps [data-busy] for ~3s and its commit-settle
	// firma animates box-shadow on the very node under measurement (5 phantom
	// diffs between two runs of the same code, 2026-08-21). Wait for the busy
	// window to close before every snapshot.
	const settle = () =>
		page
			.waitForFunction(() => !document.querySelector('[data-busy]'), null, { timeout: 15000 })
			.catch(() => {});

	// Every load resets the demo's controls, so the variant chips are re-clicked
	// after each one — the probe reloads once per size, plus open and hover.
	const variants = async () => {
		for (const sel of DEMO_VARIANTS[component] ?? []) {
			const el = page.locator(sel).first();
			if (!(await el.count())) throw new Error(`variant selector matches nothing: ${sel}`);
			await el.click({ timeout: 2000 });
			await page.waitForTimeout(200);
		}
	};
	// FREEZE MOTION BEFORE EVERY SNAPSHOT. The probe used to freeze nothing, so a
	// property mid-transition returned the OLD value and a property under a
	// LOOPING animation returned wherever the loop happened to be — pure run-to-run
	// noise on the gate that is supposed to prove «the default did not move».
	// Measured 2026-08-24 on `chat-typing`: 18 phantom `opacity` diffs on its three
	// pulse dots, reproduced running the probe TWICE over identical code. A token
	// that IS the motion reads frozen and must be measured unfrozen by hand, which
	// is already the idiom the ledger uses for `transition-duration` / `-ease`.
	const freezeMotion = () =>
		page
			.addStyleTag({
				content:
					'*, *::before, *::after { transition: none !important; animation: none !important; }'
			})
			.catch(() => {});

	const prepare = async () => {
		await settle();
		await variants();
		await freezeMotion();
	};

	// A demo whose network NEVER goes idle (image mounts a deliberately broken
	// src for its error state, and the browser keeps retrying) killed the whole
	// probe with a TimeoutError. The idle wait is a convenience, not a gate:
	// fall back to the load event and carry on.
	const open = async (u: string) => {
		try {
			await page.goto(u, { waitUntil: 'networkidle', timeout: 15000 });
		} catch {
			await page.goto(u, { waitUntil: 'load', timeout: 15000 });
			await page.waitForTimeout(800);
		}
	};
	await open(url);
	await page.waitForTimeout(600);
	await prepare();

	const measure = (c: string, props: string[], size: string | null) =>
		page.evaluate(
			([kebab, keys, forced, extra]) => {
				const root = document.querySelector('[data-uix-stage]') ?? document.body;
				const nodes = [...root.querySelectorAll<HTMLElement>('*')].filter(
					(n) =>
						[...n.attributes].some((a) => a.name.startsWith(`data-${kebab}`)) ||
						(extra ? n.matches(extra as string) : false)
				);
				if (forced)
					for (const n of nodes)
						if (n.hasAttribute('data-size')) n.setAttribute('data-size', forced);
				const key = (n: HTMLElement) => {
					const attrs = [...n.attributes]
						.filter((a) => a.name.startsWith('data-') && !a.name.startsWith('data-event'))
						.map((a) => (a.value ? `${a.name}=${a.value}` : a.name))
						.sort()
						.join('|');
					return `${n.tagName.toLowerCase()}[${attrs}]`;
				};
				const seen = new Map<string, number>();
				const rows: Record<string, Record<string, string>> = {};
				for (const n of nodes) {
					const base = key(n);
					const i = (seen.get(base) ?? 0) + 1;
					seen.set(base, i);
					const cs = getComputedStyle(n);
					const row: Record<string, string> = {};
					for (const k of keys as string[]) row[k] = cs[k as keyof CSSStyleDeclaration] as string;
					rows[`${base}#${i}`] = row;
				}
				return rows;
			},
			[c, props, size, EXTRA_NODES[c] ?? null] as const
		);

	const result: Record<string, unknown> = {};
	result.rest = await measure(component, PROPS, null);
	for (const size of SIZES) {
		await page
		.reload({ waitUntil: 'networkidle', timeout: 15000 })
		.catch(() => page.reload({ waitUntil: 'load', timeout: 15000 }));
		await page.waitForTimeout(400);
		await prepare();
		result[`size:${size}`] = await measure(component, PROPS, size);
	}

	// Open state: a portaled panel lives OUTSIDE the stage, so measure from the
	// document once the trigger has opened it (§7.2 — probe the popup open).
	await page
		.reload({ waitUntil: 'networkidle', timeout: 15000 })
		.catch(() => page.reload({ waitUntil: 'load', timeout: 15000 }));
	await page.waitForTimeout(400);
	await prepare();
	const trigger = page
		.locator(OPEN_TRIGGER[component] ?? `[data-${component}-trigger], [data-${component}-input]`)
		.first();
	if (await trigger.count()) {
		try {
			// A context menu opens on RIGHT click and on nothing else.
			await trigger.click({ button: component === 'context-menu' ? 'right' : 'left', timeout: 2000 });
			await page.waitForTimeout(500);
			result.open = await page.evaluate(
				([kebab, keys, extra]) => {
					const nodes = [...document.querySelectorAll<HTMLElement>('*')].filter(
						(n) =>
							[...n.attributes].some((a) => a.name.startsWith(`data-${kebab}`)) ||
							(extra ? n.matches(extra as string) : false)
					);
					const seen = new Map<string, number>();
					const rows: Record<string, Record<string, string>> = {};
					for (const n of nodes) {
						const attrs = [...n.attributes]
							.filter((a) => a.name.startsWith('data-') && !a.name.startsWith('data-event'))
							.map((a) => (a.value ? `${a.name}=${a.value}` : a.name))
							.sort()
							.join('|');
						const base = `${n.tagName.toLowerCase()}[${attrs}]`;
						const i = (seen.get(base) ?? 0) + 1;
						seen.set(base, i);
						const cs = getComputedStyle(n);
						const row: Record<string, string> = {};
						for (const k of keys as string[]) row[k] = cs[k as keyof CSSStyleDeclaration] as string;
						rows[`${base}#${i}`] = row;
					}
					return rows;
				},
				[component, PROPS, EXTRA_NODES[component] ?? null] as const
			);
		} catch {
			/* no openable trigger — skip the state */
		}
	}

	// Hover + focus on every interactive part the recipe could paint.
	await page
		.reload({ waitUntil: 'networkidle', timeout: 15000 })
		.catch(() => page.reload({ waitUntil: 'load', timeout: 15000 }));
	await page.waitForTimeout(400);
	await prepare();
	const targets = await page.evaluate(([kebab, extra]) => {
		const root = document.querySelector('[data-uix-stage]') ?? document.body;
		return [...root.querySelectorAll<HTMLElement>('*')]
			.filter(
				(n) =>
					[...n.attributes].some((a) => a.name.startsWith(`data-${kebab}`)) ||
					(extra ? n.matches(extra) : false)
			)
			.map((n, i) => ({ i, tag: n.tagName.toLowerCase() }))
			.filter((t) => ['button', 'a', 'input', 'li', 'div', 'tr'].includes(t.tag))
			.slice(0, 24);
	}, [component, EXTRA_NODES[component] ?? null] as const);

	const hovered: Record<string, Record<string, string>> = {};
	for (const t of targets) {
		const handle = await page.evaluateHandle(
			([kebab, idx, extra]) => {
				const root = document.querySelector('[data-uix-stage]') ?? document.body;
				const all = [...root.querySelectorAll<HTMLElement>('*')].filter(
					(n) =>
						[...n.attributes].some((a) => a.name.startsWith(`data-${kebab}`)) ||
						(extra ? n.matches(extra as string) : false)
				);
				return all[idx as number] ?? null;
			},
			[component, t.i, EXTRA_NODES[component] ?? null] as const
		);
		const el = handle.asElement();
		if (!el) continue;
		try {
			await el.hover({ timeout: 1500 });
			await page.waitForTimeout(400);
			const row = await el.evaluate((n, keys) => {
				const cs = getComputedStyle(n as HTMLElement);
				const attrs = [...(n as HTMLElement).attributes]
					.filter((a) => a.name.startsWith('data-') && !a.name.startsWith('data-event'))
					.map((a) => (a.value ? `${a.name}=${a.value}` : a.name))
					.sort()
					.join('|');
				const out: Record<string, string> = { __key: attrs };
				for (const k of keys as string[]) out[k] = cs[k as keyof CSSStyleDeclaration] as string;
				return out;
			}, PROPS);
			hovered[`${t.i}:${row.__key}`] = row;
		} catch {
			/* not hoverable (offscreen / covered) — skip */
		}
	}
	result.hover = hovered;

	await browser.close();
	writeFileSync(out, JSON.stringify(result, null, '\t'), 'utf8');
	const count = Object.keys(result.rest as object).length;
	console.log(`probe ${component}: ${count} nodes at rest, ${Object.keys(hovered).length} hovered`);
}

main();