// Copyright 2021 The Pigweed 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
//
//     https://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.

/* eslint-env browser, jasmine */
import 'jasmine';

import {PacketType, RpcPacket} from 'packet_proto_tspb/packet_proto_tspb_pb/pw_rpc/internal/packet_pb'
import {Library} from 'pigweed/pw_protobuf_compiler/ts/proto_lib';
import {Status} from 'pigweed/pw_status/ts/status';
import {Request} from 'test_protos_tspb/test_protos_tspb_pb/pw_rpc/ts/test2_pb'

import {Client} from './client';
import {Channel} from './descriptors';
import * as packets from './packets';

const TEST_PROTO_PATH = 'pw_rpc/ts/test_protos-descriptor-set.proto.bin';

describe('Client', () => {
  let lib: Library;
  let client: Client;
  let lastPacketSent: RpcPacket;

  beforeEach(async () => {
    lib = await Library.fromFileDescriptorSet(
        TEST_PROTO_PATH, 'test_protos_tspb');
    const channels = [new Channel(1, savePacket), new Channel(5)];
    client = Client.fromProtoSet(channels, lib);
  });

  function savePacket(packetBytes: Uint8Array): void {
    lastPacketSent = RpcPacket.deserializeBinary(packetBytes);
  }

  it('channel returns undefined for empty list', () => {
    const channels = Array<Channel>();
    const emptyChannelClient = Client.fromProtoSet(channels, lib);
    expect(emptyChannelClient.channel()).toBeUndefined();
  });

  it('fetches channel or returns undefined', () => {
    expect(client.channel(1)!.channel.id).toEqual(1);
    expect(client.channel(5)!.channel.id).toEqual(5);
    expect(client.channel()!.channel.id).toEqual(1);
    expect(client.channel(2)).toBeUndefined();
  });

  it('ChannelClient fetches method by name', () => {
    const channel = client.channel()!;
    const stub = channel.methodStub('pw.rpc.test1.TheTestService.SomeUnary')!;
    expect(stub.method.name).toEqual('SomeUnary');
  })

  it('ChannelClient for unknown name returns undefined', () => {
    const channel = client.channel()!;
    expect(channel.methodStub('')).toBeUndefined();
    expect(channel.methodStub('pw.rpc.test1.Garbage.SomeUnary'))
        .toBeUndefined();
    expect(channel.methodStub('pw.rpc.test1.TheTestService.Garbage'))
        .toBeUndefined();
  })

  it('processPacket with invalid proto data', () => {
    const textEncoder = new TextEncoder();
    const data = textEncoder.encode('NOT a packet!');
    expect(client.processPacket(data)).toEqual(Status.DATA_LOSS)
  });

  it('processPacket not for client', () => {
    const packet = new RpcPacket();
    packet.setType(PacketType.REQUEST);
    const processStatus = client.processPacket(packet.serializeBinary());
    expect(processStatus).toEqual(Status.INVALID_ARGUMENT);
  });

  it('processPacket for unrecognized channel', () => {
    const packet = packets.encodeResponse([123, 456, 789], new Request());
    expect(client.processPacket(packet)).toEqual(Status.NOT_FOUND);
  });

  it('processPacket for unrecognized service', () => {
    const packet = packets.encodeResponse([1, 456, 789], new Request());
    const status = client.processPacket(packet);
    expect(client.processPacket(packet)).toEqual(Status.OK);

    expect(lastPacketSent.getChannelId()).toEqual(1);
    expect(lastPacketSent.getServiceId()).toEqual(456);
    expect(lastPacketSent.getMethodId()).toEqual(789);
    expect(lastPacketSent.getType()).toEqual(PacketType.CLIENT_ERROR);
    expect(lastPacketSent.getStatus()).toEqual(Status.NOT_FOUND);
  });

  it('processPacket for unrecognized method', () => {
    const service = client.services.values().next().value;

    const packet = packets.encodeResponse([1, service.id, 789], new Request());
    const status = client.processPacket(packet);
    expect(client.processPacket(packet)).toEqual(Status.OK);

    expect(lastPacketSent.getChannelId()).toEqual(1);
    expect(lastPacketSent.getServiceId()).toEqual(service.id);
    expect(lastPacketSent.getMethodId()).toEqual(789);
    expect(lastPacketSent.getType()).toEqual(PacketType.CLIENT_ERROR);
    expect(lastPacketSent.getStatus()).toEqual(Status.NOT_FOUND);
  });

  it('processPacket for non-pending method', () => {
    const service = client.services.values().next().value;
    const method = service.methods.values().next().value;

    const packet =
        packets.encodeResponse([1, service.id, method.id], new Request());
    const status = client.processPacket(packet);
    expect(client.processPacket(packet)).toEqual(Status.OK);

    expect(lastPacketSent.getChannelId()).toEqual(1);
    expect(lastPacketSent.getServiceId()).toEqual(service.id);
    expect(lastPacketSent.getMethodId()).toEqual(method.id);
    expect(lastPacketSent.getType()).toEqual(PacketType.CLIENT_ERROR);
    expect(lastPacketSent.getStatus()).toEqual(Status.FAILED_PRECONDITION);
  });
})