/*
 * Copyright 2019 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import * as assert from 'assert';

import * as grpc from '../src';
import { Server, ServerCredentials } from '../src';
import { Client } from '../src';
import { ConnectivityState } from '../src/channel';

const clientInsecureCreds = grpc.credentials.createInsecure();
const serverInsecureCreds = ServerCredentials.createInsecure();

describe('Client', () => {
  let server: Server;
  let client: Client;

  before(done => {
    server = new Server();

    server.bindAsync(
      'localhost:0',
      serverInsecureCreds,
      (err, port) => {
        assert.ifError(err);
        client = new Client(
          `localhost:${port}`,
          clientInsecureCreds
        );
        server.start();
        done();
      }
    );
  });

  after(done => {
    client.close();
    server.tryShutdown(done);
  });

  it('should call the waitForReady callback only once, when channel connectivity state is READY', done => {
    const deadline = Date.now() + 100;
    let calledTimes = 0;
    client.waitForReady(deadline, err => {
      assert.ifError(err);
      assert.equal(
        client.getChannel().getConnectivityState(true),
        ConnectivityState.READY
      );
      calledTimes += 1;
    });
    setTimeout(() => {
      assert.equal(calledTimes, 1);
      done();
    }, deadline - Date.now());
  });
});

describe('Client without a server', () => {
  let client: Client;
  before(() => {
    // Arbitrary target that should not have a running server
    client = new Client('localhost:12345', clientInsecureCreds);
  });
  after(() => {
    client.close();
  });
  it('should fail multiple calls to the nonexistent server', done => {
    // Regression test for https://github.com/grpc/grpc-node/issues/1411
    client.makeUnaryRequest('/service/method', x => x, x => x, Buffer.from([]), (error, value) => {
      assert(error);
      assert.strictEqual(error?.code, grpc.status.UNAVAILABLE);
      client.makeUnaryRequest('/service/method', x => x, x => x, Buffer.from([]), (error, value) => {
        assert(error);
        assert.strictEqual(error?.code, grpc.status.UNAVAILABLE);
        done();
      });
    });
  });
});