import request from 'supertest';
import { describe, expect, it } from 'vitest';

import type { Response } from 'supertest';

import type { ApiError as ApiErrorBody } from '@openvidu-dashboard/typings';
import * as z from 'zod';

import { docsRouter, openApiDocument } from '../../src/api/openapi.js';
import { type Authenticator, type RouteDefinition, RouteRegistry } from '../../src/api/route-registry.js';
import { ApiError } from '../../src/http/api-error.js';
import { createHttpApp } from '../../src/http/app.js';
import { silentLogger } from '../support/silent-logger.js';

/** The error of an API error response, with `details` loosely typed for assertions. */
function errorOf(response: Response) {
	return (response.body as ApiErrorBody).error as ApiErrorBody['error'] & {
		details: { issues: { path: string[] }[] } & Record<string, unknown>;
	};
}

const authenticate: Authenticator = (req, required) => {
	if (req.get('Authorization') === 'Bearer good') {
		req.auth = { username: 'admin', edition: 'ce', expiresAt: new Date() };
	} else if (required || req.get('Authorization') !== undefined) {
		return Promise.reject(new ApiError('UNAUTHORIZED', 'Missing access token', { reason: 'missing' }));
	}

	return Promise.resolve();
};

function registry(edition: 'ce' | 'pro') {
	const routes = new RouteRegistry(edition);

	routes.register({
		method: 'get',
		path: '/rooms',
		edition: 'ce',
		summary: 'List rooms',
		tags: ['rooms'],
		security: 'bearer',
		request: { query: z.object({ limit: z.coerce.number().int().max(100).default(25) }) },
		responses: { 200: { description: 'Rooms', schema: z.object({ limit: z.number() }) } },
		handler: ({ query }) => query
	});
	routes.register({
		method: 'get',
		path: '/rooms/{sid}',
		edition: 'pro',
		feature: 'room-detail',
		summary: 'Room detail',
		tags: ['rooms'],
		security: 'bearer',
		request: { params: z.object({ sid: z.string() }) },
		responses: { 200: { description: 'Room' } }
	});

	return routes;
}

const SUMMARY: RouteDefinition = {
	method: 'get',
	path: '/rooms/summary',
	edition: 'ce',
	summary: 'Rooms summary',
	tags: ['rooms'],
	security: 'bearer',
	responses: { 200: { description: 'Summary' } },
	handler: () => ({ summary: true })
};

const ROOM_DETAIL: RouteDefinition = {
	method: 'get',
	path: '/rooms/{sid}',
	edition: 'pro',
	feature: 'room-detail',
	summary: 'Room detail',
	tags: ['rooms'],
	security: 'bearer',
	responses: { 200: { description: 'Room' } }
};

/** A literal route, the lock it must precede and a CE route after them. */
function locked(edition: 'ce' | 'pro') {
	const routes = new RouteRegistry(edition);

	routes.register(SUMMARY);
	routes.lock({ method: 'get', path: '/rooms/{sid}', feature: 'room-detail' });
	routes.register({ ...SUMMARY, path: '/rooms/{sid}/events', handler: () => ({ events: [] }) });

	return routes;
}

function app(routes: RouteRegistry, docs: boolean) {
	return createHttpApp({
		logger: silentLogger(),
		appRoot: '/nonexistent',
		trustProxy: false,
		apiRouter: routes.router(authenticate),
		...(docs ? { docsRouter: docsRouter(() => openApiDocument(routes, '3.10.0')) } : {})
	});
}

describe('route registry', () => {
	it('authenticates, validates and answers a CE route', async () => {
		const server = app(registry('ce'), false);

		expect((await request(server).get('/api/v1/rooms')).status).toBe(401);
		expect((await request(server).get('/api/v1/rooms?limit=500').set('Authorization', 'Bearer good')).status).toBe(
			400
		);
		expect((await request(server).get('/api/v1/rooms').set('Authorization', 'Bearer good')).body).toEqual({
			limit: 25
		});
	});

	it('answers PRO routes on CE with PRO_FEATURE after authentication', async () => {
		const server = app(registry('ce'), false);
		const anonymous = await request(server).get('/api/v1/rooms/RM_abc');
		const authenticated = await request(server).get('/api/v1/rooms/RM_abc').set('Authorization', 'Bearer good');

		expect(anonymous.status).toBe(401);
		expect(authenticated.status).toBe(403);
		expect(authenticated.body).toEqual({
			error: {
				code: 'PRO_FEATURE',
				message: 'This feature requires OpenVidu PRO',
				details: { feature: 'room-detail' }
			}
		});
	});

	it('refuses duplicate routes and PRO routes without a feature', () => {
		const routes = registry('ce');

		expect(() => {
			routes.register({
				method: 'get',
				path: '/rooms',
				edition: 'ce',
				summary: '',
				tags: [],
				security: 'public',
				responses: {}
			});
		}).toThrow();
		expect(() => {
			routes.register({
				method: 'get',
				path: '/participants/{sid}',
				edition: 'pro',
				summary: '',
				tags: [],
				security: 'bearer',
				responses: {}
			});
		}).toThrow();
	});

	it('documents every registered route in OpenAPI 3.1', async () => {
		const routes = registry('ce');
		const response = await request(app(routes, true)).get('/api/v1/docs/openapi.json');
		const document = response.body as { openapi: string; paths: Record<string, Record<string, unknown>> };

		expect(response.status).toBe(200);
		expect(document.openapi).toBe('3.1.0');

		for (const route of routes.list()) {
			expect(
				document.paths[`/api/v1${route.path}`]?.[route.method],
				`${route.method} ${route.path}`
			).toBeDefined();
		}

		expect((await request(app(routes, true)).get('/api/v1/docs')).text).toContain('createApiReference');
	});

	it('answers a lock with PRO_FEATURE after authentication and leaves it out of the document', async () => {
		const routes = locked('ce');
		const server = app(routes, true);
		const authenticated = await request(server).get('/api/v1/rooms/RM_abc').set('Authorization', 'Bearer good');
		const document = (await request(server).get('/api/v1/docs/openapi.json')).body as {
			paths: Record<string, unknown>;
		};

		expect((await request(server).get('/api/v1/rooms/RM_abc')).status).toBe(401);
		expect(authenticated.status).toBe(403);
		expect(errorOf(authenticated)).toEqual({
			code: 'PRO_FEATURE',
			message: 'This feature requires OpenVidu PRO',
			details: { feature: 'room-detail' }
		});
		expect(Object.keys(document.paths)).toEqual(['/api/v1/rooms/summary', '/api/v1/rooms/{sid}/events']);
		expect(routes.unimplemented()).toEqual(['GET /rooms/{sid}']);
	});

	it('replaces a lock where it was declared', async () => {
		const routes = locked('pro');

		routes.register({
			...ROOM_DETAIL,
			request: { params: z.object({ sid: z.string() }) },
			handler: ({ params }) => params
		});

		const server = app(routes, false);

		expect(routes.list().map((route) => route.path)).toEqual([
			'/rooms/summary',
			'/rooms/{sid}',
			'/rooms/{sid}/events'
		]);
		expect(routes.unimplemented()).toEqual([]);
		expect((await request(server).get('/api/v1/rooms/summary').set('Authorization', 'Bearer good')).body).toEqual({
			summary: true
		});
		expect((await request(server).get('/api/v1/rooms/RM_abc').set('Authorization', 'Bearer good')).body).toEqual({
			sid: 'RM_abc'
		});
	});

	it('refuses to lock a registered route and to replace a lock with another feature', () => {
		const routes = locked('pro');

		expect(() => {
			routes.lock({ method: 'get', path: '/rooms/summary', feature: 'room-detail' });
		}).toThrow('already registered');
		expect(() => {
			routes.register({ ...ROOM_DETAIL, feature: 'participant-detail' });
		}).toThrow('locked for the feature room-detail');
		routes.register(ROOM_DETAIL);
		expect(() => {
			routes.register(ROOM_DETAIL);
		}).toThrow('already registered');
	});

	it('replaces a registered route in place and refuses unknown routes and locks', async () => {
		const routes = locked('pro');

		routes.replace({ ...SUMMARY, handler: () => ({ summary: 'extended' }) });

		expect(routes.list().map((route) => route.path)).toEqual(['/rooms/summary', '/rooms/{sid}/events']);
		expect(
			(await request(app(routes, false)).get('/api/v1/rooms/summary').set('Authorization', 'Bearer good')).body
		).toEqual({ summary: 'extended' });
		expect(() => {
			routes.replace({ ...SUMMARY, path: '/rooms/unknown' });
		}).toThrow('not registered');
		expect(() => {
			routes.replace(ROOM_DETAIL);
		}).toThrow('not registered');
	});

	it('serves no documentation in production', async () => {
		const server = app(registry('ce'), false);

		for (const path of ['/api/v1/docs', '/api/v1/docs/openapi.json']) {
			const response = await request(server).get(path);

			expect(response.status, path).toBe(404);
			expect(errorOf(response).code).toBe('NOT_FOUND');
		}
	});
});