/**
 * Morfo vocabulary consistency check.
 *
 * Walks every morfo's `data` declarations and reports any attr with
 * `values: string[]` whose set is NOT one of the canonical vocabularies
 * declared in `CANONICAL_VOCABULARIES` (exported from morfo/schema.ts).
 *
 * Rationale (see sema_pre.md §5 + study.md §10):
 *   Sema selectors rely on consistent state vocabularies across components.
 *   If Accordion uses `data-state: ['open', 'closed']` then Dialog and Drawer
 *   must use the same tokens — not `visible|hidden` or `expanded|collapsed`.
 *
 * Strategy: a whitelist of known vocabularies. Any enum that doesn't exactly
 * match one of them is flagged as a WARNING, not a hard error. Promote to
 * error only when the vocabulary registry is mature enough that divergence
 * is always a bug.
 *
 * Exit codes:
 *   0 — all enums match a canonical vocabulary (or are novel but acceptable).
 *   1 — at least one enum diverges and should be investigated.
 */

import { readdirSync } from 'node:fs';
import { fileURLToPath, pathToFileURL } from 'node:url';
import { dirname, join } from 'node:path';
import type { Morfo, MorfoPart } from '../src/uix/morfo/types';
import { validateMorfo, CANONICAL_VOCABULARIES } from '../src/uix/morfo/schema';

const __dirname = dirname(fileURLToPath(import.meta.url));
const MORFOS_DIR = join(__dirname, '..', 'src', 'uix', 'morfo', 'components');

async function loadMorfos(): Promise<Morfo[]> {
	const files = readdirSync(MORFOS_DIR).filter(
		(f) => f.endsWith('.ts') && !f.endsWith('.test.ts')
	);
	const out: Morfo[] = [];
	for (const f of files) {
		const url = pathToFileURL(join(MORFOS_DIR, f)).href;
		const mod = (await import(url)) as Record<string, unknown>;
		for (const v of Object.values(mod)) {
			if (typeof v === 'object' && v !== null && 'kebab' in v && 'parts' in v) {
				out.push(validateMorfo(v));
			}
		}
	}
	return out;
}

function flatParts(parts: readonly MorfoPart[]): MorfoPart[] {
	const out: MorfoPart[] = [];
	for (const p of parts) {
		out.push(p);
		if (p.parts && p.parts.length > 0) out.push(...flatParts(p.parts));
	}
	return out;
}

type Classification =
	| { kind: 'match'; vocabulary: string }
	| { kind: 'subset'; vocabulary: string; extra: string[] }
	| { kind: 'superset'; vocabulary: string; missing: string[] }
	| { kind: 'unknown' };

function classify(values: readonly string[]): Classification {
	const valueSet = new Set(values);
	for (const [name, canonical] of Object.entries(CANONICAL_VOCABULARIES)) {
		const canonicalSet = new Set(canonical);
		if (
			canonicalSet.size === valueSet.size &&
			[...valueSet].every((v) => canonicalSet.has(v))
		) {
			return { kind: 'match', vocabulary: name };
		}
		// Enum extends a canonical (added values)
		if ([...canonicalSet].every((v) => valueSet.has(v))) {
			const extra = [...valueSet].filter((v) => !canonicalSet.has(v));
			if (extra.length > 0 && extra.length <= 3) {
				return { kind: 'subset', vocabulary: name, extra };
			}
		}
		// Enum shrinks a canonical (removed values)
		if ([...valueSet].every((v) => canonicalSet.has(v))) {
			const missing = [...canonicalSet].filter((v) => !valueSet.has(v));
			if (missing.length > 0 && missing.length <= 3) {
				return { kind: 'superset', vocabulary: name, missing };
			}
		}
	}
	return { kind: 'unknown' };
}

// ── Main ────────────────────────────────────────────────────────────────────

const morfos = await loadMorfos();
console.error(`Scanning ${morfos.length} morfo${morfos.length === 1 ? '' : 's'} for vocabulary divergence...`);

type Finding = {
	morfo: string;
	part: string;
	attr: string;
	values: readonly string[];
	classification: Classification;
};

/**
 * Attrs whose value sets are per-component by design, not shared vocabulary.
 * Skipped by the consistency check — Dialog's `saved|cancelled|…` is correctly
 * different from Toast's `dismissed|auto-timeout|action`.
 */
const PER_COMPONENT_ATTRS = new Set(['data-last-action']);

const findings: Finding[] = [];

for (const morfo of morfos) {
	for (const part of flatParts(morfo.parts)) {
		for (const data of part.data) {
			if (!data.values) continue;
			if (PER_COMPONENT_ATTRS.has(data.attr)) continue;
			const classification = classify(data.values);
			if (classification.kind !== 'match') {
				findings.push({
					morfo: morfo.kebab,
					part: part.kebab,
					attr: data.attr,
					values: data.values,
					classification
				});
			}
		}
	}
}

if (findings.length === 0) {
	console.log(`All enum values match canonical vocabularies.`);
	process.exit(0);
}

console.log('');
console.log(`Found ${findings.length} divergent enum${findings.length === 1 ? '' : 's'}:`);
console.log('');

for (const f of findings) {
	const loc = `${f.morfo}.${f.part}.${f.attr}`;
	const values = `[${f.values.join(', ')}]`;
	switch (f.classification.kind) {
		case 'subset':
			console.log(
				`WARN  ${loc}  ${values}  extends "${f.classification.vocabulary}" with: ${f.classification.extra.join(', ')}`
			);
			break;
		case 'superset':
			console.log(
				`WARN  ${loc}  ${values}  shrinks "${f.classification.vocabulary}" missing: ${f.classification.missing.join(', ')}`
			);
			break;
		case 'unknown':
			console.log(
				`WARN  ${loc}  ${values}  no canonical vocabulary matches. Consider if this should use one of: ${Object.keys(CANONICAL_VOCABULARIES).join(', ')}`
			);
			break;
	}
}

console.log('');
console.log(
	`These are WARNINGS — novel vocabularies may be legitimate. Review each above: if the value set SHOULD match a canonical vocabulary, align it. If the component introduces a NEW canonical vocabulary, add it to CANONICAL_VOCABULARIES in src/uix/morfo/schema.ts.`
);

process.exit(0); // WARN only — don't fail CI yet (until vocabulary registry is mature)