import { describe, expect, it } from 'vitest';
import { currentRequestId, nextRequestId, runWithRequestId } from '../src/request-context';

describe('request-context', () => {
    it('nextRequestId increments monotonically and stays a positive integer', () => {
        const a = nextRequestId();
        const b = nextRequestId();
        expect(a).toBeGreaterThan(0);
        expect(b).toBe(a + 1);
    });

    it('runWithRequestId binds the id across sync + async, with nested scopes restoring', async () => {
        expect(currentRequestId()).toBeUndefined();

        runWithRequestId(42, () => {
            expect(currentRequestId()).toBe(42);
            runWithRequestId(99, () => {
                expect(currentRequestId()).toBe(99);
            });
            expect(currentRequestId()).toBe(42); // outer scope restored after the nested one
        });

        expect(currentRequestId()).toBeUndefined(); // cleared outside any scope

        await runWithRequestId(7, async () => {
            await Promise.resolve();
            expect(currentRequestId()).toBe(7); // survives awaits in the same async chain
        });
    });

    it('returns the callback result', () => {
        expect(runWithRequestId(1, () => 'value')).toBe('value');
    });
});