/*
 * 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.
 *
 */

// Allow `any` data type for testing runtime type checking.
// tslint:disable no-any
import * as assert from 'assert';
import * as fs from 'fs';
import * as path from 'path';

import * as grpc from '../src';
import {ServerCredentials} from '../src';
import {ServiceError} from '../src/call';
import {ServiceClient, ServiceClientConstructor} from '../src/make-client';
import {Server} from '../src/server';
import {sendUnaryData, ServerDuplexStream, ServerReadableStream, ServerUnaryCall, ServerWritableStream} from '../src/server-call';

import {loadProtoFile} from './common';

const ca = fs.readFileSync(path.join(__dirname, 'fixtures', 'ca.pem'));
const key = fs.readFileSync(path.join(__dirname, 'fixtures', 'server1.key'));
const cert = fs.readFileSync(path.join(__dirname, 'fixtures', 'server1.pem'));
function noop(): void {}


describe('Server', () => {
  describe('constructor', () => {
    it('should work with no arguments', () => {
      assert.doesNotThrow(() => {
        new Server();  // tslint:disable-line:no-unused-expression
      });
    });

    it('should work with an empty object argument', () => {
      assert.doesNotThrow(() => {
        new Server({});  // tslint:disable-line:no-unused-expression
      });
    });

    it('should be an instance of Server', () => {
      const server = new Server();

      assert(server instanceof Server);
    });
  });

  describe('bindAsync', () => {
    it('binds with insecure credentials', (done) => {
      const server = new Server();

      server.bindAsync(
          'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
            assert.ifError(err);
            assert(typeof port === 'number' && port > 0);
            server.tryShutdown(done);
          });
    });

    it('binds with secure credentials', (done) => {
      const server = new Server();
      const creds = ServerCredentials.createSsl(
          ca, [{private_key: key, cert_chain: cert}], true);

      server.bindAsync('localhost:0', creds, (err, port) => {
        assert.ifError(err);
        assert(typeof port === 'number' && port > 0);
        server.tryShutdown(done);
      });
    });

    it('throws if bind is called after the server is started', () => {
      const server = new Server();

      server.bindAsync(
          'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
            assert.ifError(err);
            server.start();
            assert.throws(() => {
              server.bindAsync(
                  'localhost:0', ServerCredentials.createInsecure(), noop);
            }, /server is already started/);
          });
    });

    it('throws on invalid inputs', () => {
      const server = new Server();

      assert.throws(() => {
        server.bindAsync(null as any, ServerCredentials.createInsecure(), noop);
      }, /port must be a string/);

      assert.throws(() => {
        server.bindAsync('localhost:0', null as any, noop);
      }, /creds must be an object/);

      assert.throws(() => {
        server.bindAsync(
            'localhost:0', ServerCredentials.createInsecure(), null as any);
      }, /callback must be a function/);
    });
  });

  describe('tryShutdown', () => {
    it('calls back with an error if the server is not running', (done) => {
      const server = new Server();

      server.tryShutdown((err) => {
        assert(err !== undefined && err.message === 'server is not running');
        done();
      });
    });
  });

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

    beforeEach((done) => {
      server = new Server();
      server.bindAsync('localhost:0', ServerCredentials.createInsecure(), done);
    });

    afterEach((done) => {
      server.tryShutdown(done);
    });

    it('starts without error', () => {
      assert.doesNotThrow(() => {
        server.start();
      });
    });

    it('throws if started twice', () => {
      server.start();
      assert.throws(() => {
        server.start();
      }, /server is already started/);
    });

    it('throws if the server is not bound', () => {
      const server = new Server();

      assert.throws(() => {
        server.start();
      }, /server must be bound in order to start/);
    });
  });

  describe('addService', () => {
    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;
    const dummyImpls = {div() {}, divMany() {}, fib() {}, sum() {}};
    const altDummyImpls = {Div() {}, DivMany() {}, Fib() {}, Sum() {}};

    it('succeeds with a single service', () => {
      const server = new Server();

      assert.doesNotThrow(() => {
        server.addService(mathServiceAttrs, dummyImpls);
      });
    });

    it('fails to add an empty service', () => {
      const server = new Server();

      assert.throws(() => {
        server.addService({}, dummyImpls);
      }, /Cannot add an empty service to a server/);
    });

    it('fails with conflicting method names', () => {
      const server = new Server();

      server.addService(mathServiceAttrs, dummyImpls);
      assert.throws(() => {
        server.addService(mathServiceAttrs, dummyImpls);
      }, /Method handler for .+ already provided/);
    });

    it('supports method names as originally written', () => {
      const server = new Server();

      assert.doesNotThrow(() => {
        server.addService(mathServiceAttrs, altDummyImpls);
      });
    });

    it('fails if the server has been started', (done) => {
      const server = new Server();

      server.bindAsync(
          'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
            assert.ifError(err);
            server.start();
            assert.throws(() => {
              server.addService(mathServiceAttrs, dummyImpls);
            }, /Can't add a service to a started server\./);
            server.tryShutdown(done);
          });
    });
  });

  it('throws when unimplemented methods are called', () => {
    const server = new Server();

    assert.throws(() => {
      server.addProtoService();
    }, /Not implemented. Use addService\(\) instead/);

    assert.throws(() => {
      server.forceShutdown();
    }, /Not yet implemented/);

    assert.throws(() => {
      server.addHttp2Port();
    }, /Not yet implemented/);

    assert.throws(() => {
      server.bind('localhost:0', ServerCredentials.createInsecure());
    }, /Not implemented. Use bindAsync\(\) instead/);
  });

  describe('Default handlers', () => {
    let server: Server;
    let client: ServiceClient;

    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;

    beforeEach((done) => {
      server = new Server();
      server.addService(mathServiceAttrs, {});
      server.bindAsync(
          'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
            assert.ifError(err);
            client = new mathClient(
                `localhost:${port}`, grpc.credentials.createInsecure());
            server.start();
            done();
          });
    });

    it('should respond to a unary call with UNIMPLEMENTED', (done) => {
      client.div(
          {divisor: 4, dividend: 3}, (error: ServiceError, response: any) => {
            assert(error);
            assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
            done();
          });
    });

    it('should respond to a server stream with UNIMPLEMENTED', (done) => {
      const call = client.fib({limit: 5});

      call.on('data', (value: any) => {
        assert.fail('No messages expected');
      });

      call.on('error', (err: ServiceError) => {
        assert(err);
        assert.strictEqual(err.code, grpc.status.UNIMPLEMENTED);
        done();
      });
    });
  });
});

describe('Echo service', () => {
  let server: Server;
  let client: ServiceClient;

  before((done) => {
    const protoFile = path.join(__dirname, 'fixtures', 'echo_service.proto');
    const echoService =
        loadProtoFile(protoFile).EchoService as ServiceClientConstructor;

    server = new Server();
    server.addService(echoService.service, {
      echo(call: ServerUnaryCall<any, any>, callback: sendUnaryData<any>) {
        callback(null, call.request);
      }
    });

    server.bindAsync(
        'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
          assert.ifError(err);
          client = new echoService(
              `localhost:${port}`, grpc.credentials.createInsecure());
          server.start();
          done();
        });
  });

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

  it('should echo the recieved message directly', (done) => {
    client.echo(
        {value: 'test value', value2: 3},
        (error: ServiceError, response: any) => {
          assert.ifError(error);
          assert.deepStrictEqual(response, {value: 'test value', value2: 3});
          done();
        });
  });
});

describe('Generic client and server', () => {
  function toString(val: any) {
    return val.toString();
  }

  function toBuffer(str: string) {
    return Buffer.from(str);
  }

  function capitalize(str: string) {
    return str.charAt(0).toUpperCase() + str.slice(1);
  }

  const stringServiceAttrs = {
    capitalize: {
      path: '/string/capitalize',
      requestStream: false,
      responseStream: false,
      requestSerialize: toBuffer,
      requestDeserialize: toString,
      responseSerialize: toBuffer,
      responseDeserialize: toString
    }
  };

  describe('String client and server', () => {
    let client: ServiceClient;
    let server: Server;

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

      server.addService(stringServiceAttrs as any, {
        capitalize(
            call: ServerUnaryCall<any, any>, callback: sendUnaryData<any>) {
          callback(null, capitalize(call.request));
        }
      });

      server.bindAsync(
          'localhost:0', ServerCredentials.createInsecure(), (err, port) => {
            assert.ifError(err);
            server.start();
            const clientConstr = grpc.makeGenericClientConstructor(
                stringServiceAttrs as any,
                'unused_but_lets_appease_typescript_anyway');
            client = new clientConstr(
                `localhost:${port}`, grpc.credentials.createInsecure());
            done();
          });
    });

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

    it('Should respond with a capitalized string', (done) => {
      client.capitalize('abc', (err: ServiceError, response: string) => {
        assert.ifError(err);
        assert.strictEqual(response, 'Abc');
        done();
      });
    });
  });
});