/*
 *  Copyright 2015 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 "ARDVideoCallView.h"

#import <AVFoundation/AVFoundation.h>

#import "sdk/objc/components/renderer/metal/RTCMTLVideoView.h"

#import "UIImage+ARDUtilities.h"

static CGFloat const kButtonPadding = 16;
static CGFloat const kButtonSize = 48;
static CGFloat const kLocalVideoViewSize = 120;
static CGFloat const kLocalVideoViewPadding = 8;
static CGFloat const kStatusBarHeight = 20;

@interface ARDVideoCallView () <RTC_OBJC_TYPE (RTCVideoViewDelegate)>
@end

@implementation ARDVideoCallView {
  UIButton *_routeChangeButton;
  UIButton *_cameraSwitchButton;
  UIButton *_hangupButton;
  CGSize _remoteVideoSize;
}

@synthesize statusLabel = _statusLabel;
@synthesize localVideoView = _localVideoView;
@synthesize remoteVideoView = _remoteVideoView;
@synthesize statsView = _statsView;
@synthesize delegate = _delegate;

- (instancetype)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    _remoteVideoView =
        [[RTC_OBJC_TYPE(RTCMTLVideoView) alloc] initWithFrame:CGRectZero];

    [self addSubview:_remoteVideoView];

    _localVideoView =
        [[RTC_OBJC_TYPE(RTCCameraPreviewView) alloc] initWithFrame:CGRectZero];
    [self addSubview:_localVideoView];

    _statsView = [[ARDStatsView alloc] initWithFrame:CGRectZero];
    _statsView.hidden = YES;
    [self addSubview:_statsView];

    _routeChangeButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _routeChangeButton.backgroundColor = [UIColor grayColor];
    _routeChangeButton.layer.cornerRadius = kButtonSize / 2;
    _routeChangeButton.layer.masksToBounds = YES;
    UIImage *image = [UIImage imageForName:@"ic_surround_sound_black_24dp.png"
                                     color:[UIColor whiteColor]];
    [_routeChangeButton setImage:image forState:UIControlStateNormal];
    [_routeChangeButton addTarget:self
                           action:@selector(onRouteChange:)
                 forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:_routeChangeButton];

    // TODO(tkchin): don't display this if we can't actually do camera switch.
    _cameraSwitchButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _cameraSwitchButton.backgroundColor = [UIColor grayColor];
    _cameraSwitchButton.layer.cornerRadius = kButtonSize / 2;
    _cameraSwitchButton.layer.masksToBounds = YES;
    image = [UIImage imageForName:@"ic_switch_video_black_24dp.png"
                            color:[UIColor whiteColor]];
    [_cameraSwitchButton setImage:image forState:UIControlStateNormal];
    [_cameraSwitchButton addTarget:self
                            action:@selector(onCameraSwitch:)
                  forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:_cameraSwitchButton];

    _hangupButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _hangupButton.backgroundColor = [UIColor redColor];
    _hangupButton.layer.cornerRadius = kButtonSize / 2;
    _hangupButton.layer.masksToBounds = YES;
    image = [UIImage imageForName:@"ic_call_end_black_24dp.png"
                            color:[UIColor whiteColor]];
    [_hangupButton setImage:image forState:UIControlStateNormal];
    [_hangupButton addTarget:self
                      action:@selector(onHangup:)
            forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:_hangupButton];

    _statusLabel = [[UILabel alloc] initWithFrame:CGRectZero];
    _statusLabel.font = [UIFont fontWithName:@"Roboto" size:16];
    _statusLabel.textColor = [UIColor whiteColor];
    [self addSubview:_statusLabel];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
        initWithTarget:self
                action:@selector(didTripleTap:)];
    tapRecognizer.numberOfTapsRequired = 3;
    [self addGestureRecognizer:tapRecognizer];
  }
  return self;
}

- (void)layoutSubviews {
  CGRect bounds = self.bounds;
  if (_remoteVideoSize.width > 0 && _remoteVideoSize.height > 0) {
    // Aspect fill remote video into bounds.
    CGRect remoteVideoFrame =
        AVMakeRectWithAspectRatioInsideRect(_remoteVideoSize, bounds);
    CGFloat scale = 1;
    if (remoteVideoFrame.size.width > remoteVideoFrame.size.height) {
      // Scale by height.
      scale = bounds.size.height / remoteVideoFrame.size.height;
    } else {
      // Scale by width.
      scale = bounds.size.width / remoteVideoFrame.size.width;
    }
    remoteVideoFrame.size.height *= scale;
    remoteVideoFrame.size.width *= scale;
    _remoteVideoView.frame = remoteVideoFrame;
    _remoteVideoView.center =
        CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
  } else {
    _remoteVideoView.frame = bounds;
  }

  // Aspect fit local video view into a square box.
  CGRect localVideoFrame =
      CGRectMake(0, 0, kLocalVideoViewSize, kLocalVideoViewSize);
  // Place the view in the bottom right.
  localVideoFrame.origin.x = CGRectGetMaxX(bounds) -
      localVideoFrame.size.width - kLocalVideoViewPadding;
  localVideoFrame.origin.y = CGRectGetMaxY(bounds) -
      localVideoFrame.size.height - kLocalVideoViewPadding;
  _localVideoView.frame = localVideoFrame;

  // Place stats at the top.
  CGSize statsSize = [_statsView sizeThatFits:bounds.size];
  _statsView.frame = CGRectMake(CGRectGetMinX(bounds),
                                CGRectGetMinY(bounds) + kStatusBarHeight,
                                statsSize.width,
                                statsSize.height);

  // Place hangup button in the bottom left.
  _hangupButton.frame =
      CGRectMake(CGRectGetMinX(bounds) + kButtonPadding,
                 CGRectGetMaxY(bounds) - kButtonPadding - kButtonSize,
                 kButtonSize,
                 kButtonSize);

  // Place button to the right of hangup button.
  CGRect cameraSwitchFrame = _hangupButton.frame;
  cameraSwitchFrame.origin.x =
      CGRectGetMaxX(cameraSwitchFrame) + kButtonPadding;
  _cameraSwitchButton.frame = cameraSwitchFrame;

  // Place route button to the right of camera button.
  CGRect routeChangeFrame = _cameraSwitchButton.frame;
  routeChangeFrame.origin.x = CGRectGetMaxX(routeChangeFrame) + kButtonPadding;
  _routeChangeButton.frame = routeChangeFrame;

  [_statusLabel sizeToFit];
  _statusLabel.center =
      CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
}

#pragma mark - RTC_OBJC_TYPE(RTCVideoViewDelegate)

- (void)videoView:(id<RTC_OBJC_TYPE(RTCVideoRenderer)>)videoView
    didChangeVideoSize:(CGSize)size {
  if (videoView == _remoteVideoView) {
    _remoteVideoSize = size;
  }
  [self setNeedsLayout];
}

#pragma mark - Private

- (void)onCameraSwitch:(UIButton *)sender {
  sender.enabled = false;
  [_delegate videoCallView:self
      shouldSwitchCameraWithCompletion:^(NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^(void) {
          sender.enabled = true;
        });
      }];
}

- (void)onRouteChange:(UIButton *)sender {
  sender.enabled = false;
  __weak ARDVideoCallView *weakSelf = self;
  [_delegate videoCallView:self
      shouldChangeRouteWithCompletion:^(void) {
        ARDVideoCallView *strongSelf = weakSelf;
        if (strongSelf) {
          dispatch_async(dispatch_get_main_queue(), ^(void) {
            sender.enabled = true;
          });
        }
      }];
}

- (void)onHangup:(id)sender {
  [_delegate videoCallViewDidHangup:self];
}

- (void)didTripleTap:(UITapGestureRecognizer *)recognizer {
  [_delegate videoCallViewDidEnableStats:self];
}

@end