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

vi.mock('../../src/models/admin/users/users.admin.service.js', () => ({
	listUsers: vi.fn(),
	getUserDetail: vi.fn(),
	loadAccess: vi.fn(),
	setPermissions: vi.fn(),
	disableUser: vi.fn(),
	enableUser: vi.fn(),
	revokeSession: vi.fn(),
	countActiveAdmins: vi.fn(),
	userExists: vi.fn()
}));

import * as UsersService from '../../src/models/admin/users/users.admin.service.js';
import {usersAdminRouter} from '../../src/models/admin/users/users.admin.router.js';

const service = UsersService as unknown as Record<string, Mock>;

// The router always runs behind requireAppAccess('admin'), which is what puts
// res.locals.admin there; this stands in for it.
const makeApp = (callerId = 'me') => {
	const app = express();
	app.use(express.json());
	app.use((req, res, next) => {
		res.locals.admin = {id: callerId, email: 'me@nachklang.art', displayName: 'Me', apps: ['admin']};
		next();
	});
	app.use('/admin/users', usersAdminRouter);
	return app;
};

beforeEach(() => {
	for (const fn of Object.values(service)) {
		if (typeof fn?.mockReset === 'function') {
			fn.mockReset();
		}
	}
	service.getUserDetail.mockResolvedValue({id: 'other', apps: []});
	service.userExists.mockResolvedValue(true);
});

describe('PUT /admin/users/:id/permissions', () => {
	it('rejects an unknown app name', async () => {
		const res = await request(makeApp()).put('/admin/users/other/permissions').send({apps: ['calendar', 'nope']});

		expect(res.status).toBe(400);
		expect(service.setPermissions).not.toHaveBeenCalled();
	});

	it('rejects a non-array body', async () => {
		const res = await request(makeApp()).put('/admin/users/other/permissions').send({apps: 'admin'});

		expect(res.status).toBe(400);
	});

	it('404s for an unknown user', async () => {
		service.userExists.mockResolvedValue(false);

		const res = await request(makeApp()).put('/admin/users/ghost/permissions').send({apps: []});

		expect(res.status).toBe(404);
		expect(service.setPermissions).not.toHaveBeenCalled();
	});

	it('refuses to remove the caller\'s own admin permission', async () => {
		service.loadAccess.mockResolvedValue({id: 'me', disabled: false, apps: ['admin']});
		service.countActiveAdmins.mockResolvedValue(5);

		const res = await request(makeApp('me')).put('/admin/users/me/permissions').send({apps: ['feedback']});

		expect(res.status).toBe(409);
		expect(service.setPermissions).not.toHaveBeenCalled();
	});

	// Defence in depth: with the caller themselves being an active admin this
	// count cannot actually reach 1 in production, but the guard is what makes
	// that safe to rely on rather than to reason about.
	it('refuses to remove the last remaining active admin', async () => {
		service.loadAccess.mockResolvedValue({id: 'other', disabled: false, apps: ['admin']});
		service.countActiveAdmins.mockResolvedValue(1);

		const res = await request(makeApp('me')).put('/admin/users/other/permissions').send({apps: []});

		expect(res.status).toBe(409);
		expect(service.setPermissions).not.toHaveBeenCalled();
	});

	it('allows removing an admin while another active admin remains', async () => {
		service.loadAccess.mockResolvedValue({id: 'other', disabled: false, apps: ['admin']});
		service.countActiveAdmins.mockResolvedValue(2);

		const res = await request(makeApp('me')).put('/admin/users/other/permissions').send({apps: ['tickets']});

		expect(res.status).toBe(200);
		expect(service.setPermissions).toHaveBeenCalledWith('other', ['tickets'], 'me');
	});

	it('allows granting permissions to someone who has none', async () => {
		service.loadAccess.mockResolvedValue({id: 'other', disabled: false, apps: []});

		const res = await request(makeApp('me')).put('/admin/users/other/permissions').send({apps: ['feedback', 'tickets']});

		expect(res.status).toBe(200);
		// Nothing is being taken away, so the last-admin count is not consulted.
		expect(service.countActiveAdmins).not.toHaveBeenCalled();
	});
});

describe('POST /admin/users/:id/disable', () => {
	it('refuses to disable the caller', async () => {
		const res = await request(makeApp('me')).post('/admin/users/me/disable');

		expect(res.status).toBe(409);
		expect(service.disableUser).not.toHaveBeenCalled();
	});

	it('refuses to disable the last active admin', async () => {
		service.loadAccess.mockResolvedValue({id: 'other', disabled: false, apps: ['admin']});
		service.countActiveAdmins.mockResolvedValue(1);

		const res = await request(makeApp('me')).post('/admin/users/other/disable');

		expect(res.status).toBe(409);
		expect(service.disableUser).not.toHaveBeenCalled();
	});

	it('disables a non-admin user', async () => {
		service.loadAccess.mockResolvedValue({id: 'other', disabled: false, apps: ['feedback']});

		const res = await request(makeApp('me')).post('/admin/users/other/disable');

		expect(res.status).toBe(200);
		expect(service.disableUser).toHaveBeenCalledWith('other');
	});

	it('404s for an unknown user', async () => {
		service.loadAccess.mockResolvedValue(null);

		const res = await request(makeApp('me')).post('/admin/users/ghost/disable');

		expect(res.status).toBe(404);
	});
});

describe('DELETE /admin/users/:id/sessions/:sid', () => {
	it('404s when the session does not belong to that user', async () => {
		service.revokeSession.mockResolvedValue(false);

		const res = await request(makeApp()).delete('/admin/users/other/sessions/s1');

		expect(res.status).toBe(404);
	});

	it('204s on a successful revoke', async () => {
		service.revokeSession.mockResolvedValue(true);

		const res = await request(makeApp()).delete('/admin/users/other/sessions/s1');

		expect(res.status).toBe(204);
		expect(service.revokeSession).toHaveBeenCalledWith('other', 's1');
	});
});