/*
 *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#import <Foundation/Foundation.h>
#import <OCMock/OCMock.h>
#import <QuartzCore/CoreAnimation.h>
#import <XCTest/XCTest.h>

#include "rtc_base/ssladapter.h"

#import <WebRTC/RTCMediaConstraints.h>
#import <WebRTC/RTCPeerConnectionFactory.h>

#import "ARDAppClient+Internal.h"
#import "ARDJoinResponse+Internal.h"
#import "ARDMessageResponse+Internal.h"
#import "ARDSettingsModel.h"

@interface ARDAppClientTest : XCTestCase
@end

@implementation ARDAppClientTest

#pragma mark - Mock helpers

- (id)mockRoomServerClientForRoomId:(NSString *)roomId
                           clientId:(NSString *)clientId
                        isInitiator:(BOOL)isInitiator
                           messages:(NSArray *)messages
                     messageHandler:
    (void (^)(ARDSignalingMessage *))messageHandler {
  id mockRoomServerClient =
      [OCMockObject mockForProtocol:@protocol(ARDRoomServerClient)];

  // Successful join response.
  ARDJoinResponse *joinResponse = [[ARDJoinResponse alloc] init];
  joinResponse.result = kARDJoinResultTypeSuccess;
  joinResponse.roomId = roomId;
  joinResponse.clientId = clientId;
  joinResponse.isInitiator = isInitiator;
  joinResponse.messages = messages;

  // Successful message response.
  ARDMessageResponse *messageResponse = [[ARDMessageResponse alloc] init];
  messageResponse.result = kARDMessageResultTypeSuccess;

  // Return join response from above on join.
  [[[mockRoomServerClient stub] andDo:^(NSInvocation *invocation) {
    __unsafe_unretained void (^completionHandler)(ARDJoinResponse *response,
                                                  NSError *error);
    [invocation getArgument:&completionHandler atIndex:4];
    completionHandler(joinResponse, nil);
  }] joinRoomWithRoomId:roomId isLoopback:NO completionHandler:[OCMArg any]];

  // Return message response from above on join.
  [[[mockRoomServerClient stub] andDo:^(NSInvocation *invocation) {
    __unsafe_unretained ARDSignalingMessage *message;
    __unsafe_unretained void (^completionHandler)(ARDMessageResponse *response,
                                                  NSError *error);
    [invocation getArgument:&message atIndex:2];
    [invocation getArgument:&completionHandler atIndex:5];
    messageHandler(message);
    completionHandler(messageResponse, nil);
  }] sendMessage:[OCMArg any]
            forRoomId:roomId
             clientId:clientId
    completionHandler:[OCMArg any]];

  // Do nothing on leave.
  [[[mockRoomServerClient stub] andDo:^(NSInvocation *invocation) {
    __unsafe_unretained void (^completionHandler)(NSError *error);
    [invocation getArgument:&completionHandler atIndex:4];
    if (completionHandler) {
      completionHandler(nil);
    }
  }] leaveRoomWithRoomId:roomId
                clientId:clientId
       completionHandler:[OCMArg any]];

  return mockRoomServerClient;
}

- (id)mockSignalingChannelForRoomId:(NSString *)roomId
                           clientId:(NSString *)clientId
                     messageHandler:
    (void (^)(ARDSignalingMessage *message))messageHandler {
  id mockSignalingChannel =
      [OCMockObject niceMockForProtocol:@protocol(ARDSignalingChannel)];
  [[mockSignalingChannel stub] registerForRoomId:roomId clientId:clientId];
  [[[mockSignalingChannel stub] andDo:^(NSInvocation *invocation) {
    __unsafe_unretained ARDSignalingMessage *message;
    [invocation getArgument:&message atIndex:2];
    messageHandler(message);
  }] sendMessage:[OCMArg any]];
  return mockSignalingChannel;
}

- (id)mockTURNClient {
  id mockTURNClient =
      [OCMockObject mockForProtocol:@protocol(ARDTURNClient)];
  [[[mockTURNClient stub] andDo:^(NSInvocation *invocation) {
    // Don't return anything in TURN response.
    __unsafe_unretained void (^completionHandler)(NSArray *turnServers,
                                                  NSError *error);
    [invocation getArgument:&completionHandler atIndex:2];
    completionHandler([NSArray array], nil);
  }] requestServersWithCompletionHandler:[OCMArg any]];
  return mockTURNClient;
}

- (id)mockSettingsModel {
  ARDSettingsModel *model = [[ARDSettingsModel alloc] init];
  id partialMock = [OCMockObject partialMockForObject:model];
  [[[partialMock stub] andReturn:@[ @"640x480", @"960x540", @"1280x720" ]]
      availableVideoResolutions];

  return model;
}

- (ARDAppClient *)createAppClientForRoomId:(NSString *)roomId
                                  clientId:(NSString *)clientId
                               isInitiator:(BOOL)isInitiator
                                  messages:(NSArray *)messages
                            messageHandler:
    (void (^)(ARDSignalingMessage *message))messageHandler
                          connectedHandler:(void (^)(void))connectedHandler
                    localVideoTrackHandler:(void (^)(void))localVideoTrackHandler {
  id turnClient = [self mockTURNClient];
  id signalingChannel = [self mockSignalingChannelForRoomId:roomId
                                                   clientId:clientId
                                             messageHandler:messageHandler];
  id roomServerClient =
      [self mockRoomServerClientForRoomId:roomId
                                 clientId:clientId
                              isInitiator:isInitiator
                                 messages:messages
                           messageHandler:messageHandler];
  id delegate =
      [OCMockObject niceMockForProtocol:@protocol(ARDAppClientDelegate)];
  [[[delegate stub] andDo:^(NSInvocation *invocation) {
    connectedHandler();
  }] appClient:[OCMArg any]
      didChangeConnectionState:RTCIceConnectionStateConnected];
  [[[delegate stub] andDo:^(NSInvocation *invocation) {
    localVideoTrackHandler();
  }] appClient:[OCMArg any]
      didReceiveLocalVideoTrack:[OCMArg any]];

  return [[ARDAppClient alloc] initWithRoomServerClient:roomServerClient
                                       signalingChannel:signalingChannel
                                             turnClient:turnClient
                                               delegate:delegate];
}

#pragma mark - Cases

// Tests that an ICE connection is established between two ARDAppClient objects
// where one is set up as a caller and the other the answerer. Network
// components are mocked out and messages are relayed directly from object to
// object. It's expected that both clients reach the
// RTCIceConnectionStateConnected state within a reasonable amount of time.
- (void)testSession {
  // Need block arguments here because we're setting up a callbacks before we
  // create the clients.
  ARDAppClient *caller = nil;
  ARDAppClient *answerer = nil;
  __block __weak ARDAppClient *weakCaller = nil;
  __block __weak ARDAppClient *weakAnswerer = nil;
  NSString *roomId = @"testRoom";
  NSString *callerId = @"testCallerId";
  NSString *answererId = @"testAnswererId";

  XCTestExpectation *callerConnectionExpectation =
      [self expectationWithDescription:@"Caller PC connected"];
  XCTestExpectation *answererConnectionExpectation =
      [self expectationWithDescription:@"Answerer PC connected"];

  caller = [self createAppClientForRoomId:roomId
                                 clientId:callerId
                              isInitiator:YES
                                 messages:[NSArray array]
                           messageHandler:^(ARDSignalingMessage *message) {
    ARDAppClient *strongAnswerer = weakAnswerer;
    [strongAnswerer channel:strongAnswerer.channel didReceiveMessage:message];
  }                      connectedHandler:^{
    [callerConnectionExpectation fulfill];
  }                localVideoTrackHandler:^{
  }];
  // TODO(tkchin): Figure out why DTLS-SRTP constraint causes thread assertion
  // crash in Debug.
  caller.defaultPeerConnectionConstraints =
      [[RTCMediaConstraints alloc] initWithMandatoryConstraints:nil
                                            optionalConstraints:nil];
  weakCaller = caller;

  answerer = [self createAppClientForRoomId:roomId
                                   clientId:answererId
                                isInitiator:NO
                                   messages:[NSArray array]
                             messageHandler:^(ARDSignalingMessage *message) {
    ARDAppClient *strongCaller = weakCaller;
    [strongCaller channel:strongCaller.channel didReceiveMessage:message];
  }                        connectedHandler:^{
    [answererConnectionExpectation fulfill];
  }                  localVideoTrackHandler:^{
  }];
  // TODO(tkchin): Figure out why DTLS-SRTP constraint causes thread assertion
  // crash in Debug.
  answerer.defaultPeerConnectionConstraints =
      [[RTCMediaConstraints alloc] initWithMandatoryConstraints:nil
                                            optionalConstraints:nil];
  weakAnswerer = answerer;

  // Kick off connection.
  [caller connectToRoomWithId:roomId settings:[self mockSettingsModel] isLoopback:NO];
  [answerer connectToRoomWithId:roomId settings:[self mockSettingsModel] isLoopback:NO];
  [self waitForExpectationsWithTimeout:20 handler:^(NSError *error) {
    if (error) {
      XCTFail(@"Expectation failed with error %@.", error);
    }
  }];
}

// Test to see that we get a local video connection
// Note this will currently pass even when no camera is connected as a local
// video track is created regardless (Perhaps there should be a test for that...)
#if !TARGET_IPHONE_SIMULATOR // Expect to fail on simulator due to no camera support
- (void)testSessionShouldGetLocalVideoTrackCallback {
  ARDAppClient *caller = nil;
  NSString *roomId = @"testRoom";
  NSString *callerId = @"testCallerId";

  XCTestExpectation *localVideoTrackExpectation =
      [self expectationWithDescription:@"Caller got local video."];

  caller = [self createAppClientForRoomId:roomId
                                 clientId:callerId
                              isInitiator:YES
                                 messages:[NSArray array]
                           messageHandler:^(ARDSignalingMessage *message) {}
                         connectedHandler:^{}
                   localVideoTrackHandler:^{ [localVideoTrackExpectation fulfill]; }];
  caller.defaultPeerConnectionConstraints =
      [[RTCMediaConstraints alloc] initWithMandatoryConstraints:nil
                                          optionalConstraints:nil];

  // Kick off connection.
  [caller connectToRoomWithId:roomId
                     settings:[self mockSettingsModel]
                   isLoopback:NO];
  [self waitForExpectationsWithTimeout:20 handler:^(NSError *error) {
    if (error) {
      XCTFail("Expectation timed out with error: %@.", error);
    }
  }];
}
#endif

@end