/**
 * Backpressure check for biome-ignore comments.
 *
 * 1. Ratcheting cap — source and test files have separate max counts.
 *    Lower these numbers as you fix ignores; they can never go up silently.
 * 2. Banned rules — ignoring certain rule categories is never allowed.
 * 3. Justification — every ignore must have a non-empty explanation after
 *    the rule name.
 */

import { execSync } from "node:child_process";
import { readFileSync } from "node:fs";

// ── Configuration ──────────────────────────────────────────────────────
const MAX_SOURCE_IGNORES = 4;
const MAX_TEST_IGNORES = 3;

/** Rule prefixes that must never be suppressed. */
const BANNED_PREFIXES = [
	"lint/security/",
	"lint/correctness/noGlobalObjectCalls",
	"lint/correctness/noUnsafeFinally",
];
// ───────────────────────────────────────────────────────────────────────

const IGNORE_PATTERN = /biome-ignore\s+([\w/]+)(?::\s*(.*))?/;

function findFiles() {
	return execSync("git ls-files -- '*.ts' '*.tsx'", { encoding: "utf-8" })
		.trim()
		.split("\n")
		.filter(Boolean);
}

function isTestFile(path) {
	return (
		path.includes("__tests__/") ||
		path.endsWith(".test.ts") ||
		path.endsWith(".test.tsx")
	);
}

let errors = 0;
let sourceCount = 0;
let testCount = 0;

for (const file of findFiles()) {
	const lines = readFileSync(file, "utf-8").split("\n");

	for (let i = 0; i < lines.length; i++) {
		const match = lines[i].match(IGNORE_PATTERN);
		if (!match) continue;

		const rule = match[1];
		const justification = (match[2] ?? "").trim();
		const loc = `${file}:${i + 1}`;

		// Count by category
		if (isTestFile(file)) {
			testCount++;
		} else {
			sourceCount++;
		}

		// Banned rules
		for (const prefix of BANNED_PREFIXES) {
			if (rule.startsWith(prefix)) {
				console.error(`BANNED: ${loc} — ${rule} must not be suppressed`);
				errors++;
			}
		}

		// Justification required
		if (!justification) {
			console.error(
				`MISSING JUSTIFICATION: ${loc} — biome-ignore ${rule} needs an explanation after the colon`,
			);
			errors++;
		}
	}
}

// Ratcheting caps
if (sourceCount > MAX_SOURCE_IGNORES) {
	console.error(
		`SOURCE CAP EXCEEDED: ${sourceCount} biome-ignore comments in source (max ${MAX_SOURCE_IGNORES}). Fix issues and lower the cap.`,
	);
	errors++;
}

if (testCount > MAX_TEST_IGNORES) {
	console.error(
		`TEST CAP EXCEEDED: ${testCount} biome-ignore comments in tests (max ${MAX_TEST_IGNORES}). Fix issues and lower the cap.`,
	);
	errors++;
}

// Summary
console.log(
	`biome-ignore: ${sourceCount} source (max ${MAX_SOURCE_IGNORES}), ${testCount} test (max ${MAX_TEST_IGNORES})`,
);

if (errors > 0) {
	console.error(`\n${errors} problem(s) found.`);
	process.exit(1);
} else {
	console.log("All checks passed.");
}