import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';

// admin.config calls dotenv.config(), which would read the repo's own .env and
// quietly reintroduce NODE_ENV=development - the exact value several of these
// cases exist to remove. Stub it so the tests see only what they set.
vi.mock('dotenv', () => ({config: vi.fn()}));

/**
 * admin.config reads the environment once at import, so every case here has to
 * reset the module registry and re-import it. The two things worth pinning are
 * the ones that are silent when wrong: which client-IP header is trusted, and
 * whether an unset NODE_ENV counts as production.
 */

const ORIGINAL_ENV = {...process.env};

const loadConfig = async () => {
	vi.resetModules();
	return import('../../src/models/admin/admin.config.js');
};

beforeEach(() => {
	process.env = {...ORIGINAL_ENV};
	// dotenv.config() in admin.config does not overwrite what is already set,
	// so setting these here is enough to keep the local .env out of the test.
	process.env.NODE_ENV = 'test';
	delete process.env.CLIENT_IP_HEADERS;
	delete process.env.TRUSTED_PROXY_IPS;
});

afterEach(() => {
	process.env = {...ORIGINAL_ENV};
});

describe('CLIENT_IP_HEADERS', () => {
	it('defaults to the single header Plesk nginx sets', async () => {
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual(['x-real-ip']);
		expect(config.TRUST_NO_CLIENT_IP_HEADER).toBe(false);
	});

	it('reads a comma-separated list', async () => {
		process.env.CLIENT_IP_HEADERS = 'x-real-ip, cf-connecting-ip';
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual(['x-real-ip', 'cf-connecting-ip']);
	});

	it('trusts nothing when set to "none"', async () => {
		// The escape hatch. An empty list is what better-auth reads as "no
		// headers" - it only falls back to its own default when the option is
		// absent - so this really does stop any header being believed.
		process.env.CLIENT_IP_HEADERS = 'none';
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual([]);
		expect(config.TRUST_NO_CLIENT_IP_HEADER).toBe(true);
	});

	it('accepts the hatch case-insensitively and with stray whitespace', async () => {
		process.env.CLIENT_IP_HEADERS = '  NONE  ';
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual([]);
	});

	it('treats an empty value as "use the default", not as the hatch', async () => {
		// A blank line in a .env must not silently change how requests are
		// bucketed - only the explicit word does that.
		process.env.CLIENT_IP_HEADERS = '';
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual(['x-real-ip']);
		expect(config.TRUST_NO_CLIENT_IP_HEADER).toBe(false);
	});

	it('does not mistake a header actually named none-ish for the hatch', async () => {
		process.env.CLIENT_IP_HEADERS = 'x-none';
		const config = await loadConfig();
		expect(config.CLIENT_IP_HEADERS).toEqual(['x-none']);
		expect(config.TRUST_NO_CLIENT_IP_HEADER).toBe(false);
	});
});

describe('isProd', () => {
	it('is false only for the explicit relaxed environments', async () => {
		process.env.NODE_ENV = 'development';
		expect((await loadConfig()).isProd).toBe(false);

		process.env.NODE_ENV = 'test';
		expect((await loadConfig()).isProd).toBe(false);
	});

	it('treats an unset NODE_ENV as production, which is what a bare vhost gives', async () => {
		delete process.env.NODE_ENV;
		// Strict mode refuses to boot without these; supply them so the import
		// gets far enough to answer the question being asked.
		process.env.BETTER_AUTH_SECRET = 'x'.repeat(48);
		process.env.API_BASE_URL = 'https://api.nachklang.art';
		process.env.ADMIN_APP_URL = 'https://admin.nachklang.art';

		expect((await loadConfig()).isProd).toBe(true);
	});

	it('refuses to start without a signing key outside development', async () => {
		delete process.env.NODE_ENV;
		delete process.env.BETTER_AUTH_SECRET;
		process.env.API_BASE_URL = 'https://api.nachklang.art';
		process.env.ADMIN_APP_URL = 'https://admin.nachklang.art';

		await expect(loadConfig()).rejects.toThrow(/BETTER_AUTH_SECRET/);
	});
});