import {vi, describe, it, expect, beforeEach, type Mock} from 'vitest';
import express, {Request, Response} from 'express';

/**
 * Shared body for the two cutover tests (2026-09-06). feedback.auth.ts and
 * tickets.auth.ts used to carry their own header-session authenticator against
 * the calendar users table; both are now one binding to the shared admin gate.
 *
 * What is worth asserting is not how that gate works - admin.middleware.test.ts
 * owns that - but that each module is bound to *its own* app, and that neither
 * consults the calendar users service any more. The mocks live in the calling
 * file because vi.mock is per-module-graph; only the assertions are shared.
 */

export interface BindingMocks {
	/** auth.api.getSession from the mocked admin.auth.js */
	getSession: Mock;
	/** loadAccess from the mocked users.admin.service.js */
	loadAccess: Mock;
	/** checkSession from the mocked calendar users.service.js */
	checkSession: Mock;
}

const makeReq = (): Request => ({headers: {cookie: 'nachklang.session_token=abc'}} as unknown as Request);

const makeRes = (): Response => {
	const res: any = {};
	res.status = vi.fn().mockReturnValue(res);
	res.send = vi.fn().mockReturnValue(res);
	res.locals = {};
	return res as Response;
};

const userWith = (...apps: string[]) => ({
	id: 'u1',
	email: 'a@nachklang.art',
	displayName: 'Anna Admin',
	disabled: false,
	permissions: apps.map(app => ({app, role: 'access'})),
	apps
});

export const describeAdminBinding = (
	app: string,
	otherApp: string,
	middleware: express.RequestHandler,
	mocks: () => BindingMocks
): void => {
	describe(`${app} requireAdminAuth`, () => {
		let m: BindingMocks;

		const run = async () => {
			const res = makeRes();
			const next = vi.fn();
			await middleware(makeReq(), res, next);
			return {res, next};
		};

		beforeEach(() => {
			m = mocks();
			m.getSession.mockReset();
			m.loadAccess.mockReset();
			m.checkSession.mockReset();
		});

		it('responds 401 and does not call next() without a session', async () => {
			m.getSession.mockResolvedValue(null);

			const {res, next} = await run();

			expect(res.status).toHaveBeenCalledWith(401);
			expect(next).not.toHaveBeenCalled();
		});

		it(`responds 403 for a signed-in user who only has ${otherApp}`, async () => {
			m.getSession.mockResolvedValue({user: {id: 'u1'}});
			m.loadAccess.mockResolvedValue(userWith(otherApp));

			const {res, next} = await run();

			expect(res.status).toHaveBeenCalledWith(403);
			expect(next).not.toHaveBeenCalled();
		});

		it('responds 403 for a disabled user who still holds the permission', async () => {
			m.getSession.mockResolvedValue({user: {id: 'u1'}});
			m.loadAccess.mockResolvedValue({...userWith(app), disabled: true});

			const {res, next} = await run();

			expect(res.status).toHaveBeenCalledWith(403);
			expect(next).not.toHaveBeenCalled();
		});

		it('sets res.locals.admin and calls next() with the permission', async () => {
			m.getSession.mockResolvedValue({user: {id: 'u1'}});
			m.loadAccess.mockResolvedValue(userWith(app));

			const {res, next} = await run();

			expect(next).toHaveBeenCalled();
			expect(res.locals.admin).toMatchObject({id: 'u1', email: 'a@nachklang.art', displayName: 'Anna Admin'});
		});

		it('never falls back to a calendar header session', async () => {
			m.getSession.mockResolvedValue(null);

			await run();

			expect(m.checkSession).not.toHaveBeenCalled();
		});
	});
};