/*
 Copyright 2016 OpenMarket Ltd
 Copyright 2017 Vector Creations Ltd
 
 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 "CallViewController.h"

#import "AppDelegate.h"

#import "AvatarGenerator.h"

#import "MXRoom+Riot.h"

#import "UsersDevicesViewController.h"

@interface CallViewController ()
{
    // Display a gradient view above the screen
    CAGradientLayer* gradientMaskLayer;

    /**
     Current alert (if any).
     */
    MXKAlert *currentAlert;
}

@end

@implementation CallViewController

#pragma mark - Class methods

+ (UINib *)nib
{
    return [UINib nibWithNibName:NSStringFromClass(self.class)
                          bundle:[NSBundle bundleForClass:self.class]];
}

+ (instancetype)callViewController:(MXCall*)call
{
    CallViewController* instance = [[[self class] alloc] initWithNibName:NSStringFromClass(self.class)
                                                                     bundle:[NSBundle bundleForClass:self.class]];
    
    // Load the view controller's view now (buttons and views will then be available).
    if ([instance respondsToSelector:@selector(loadViewIfNeeded)])
    {
        // iOS 9 and later
        [instance loadViewIfNeeded];
    }
    else if (instance.view)
    {
        // Patch: on iOS < 9.0, we load the view by calling its getter.
    }
    
    instance.mxCall = call;
    
    return instance;
}

#pragma mark -

- (void)finalizeInit
{
    [super finalizeInit];
    
    // Setup `MXKViewControllerHandling` properties
    self.defaultBarTintColor = kRiotNavBarTintColor;
    self.enableBarTintColorStatusChange = NO;
    self.rageShakeManager = [RageShakeManager sharedManager];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self.backToAppButton setImage:[UIImage imageNamed:@"back_icon"] forState:UIControlStateNormal];
    [self.backToAppButton setImage:[UIImage imageNamed:@"back_icon"] forState:UIControlStateHighlighted];
    
    [self.cameraSwitchButton setImage:[UIImage imageNamed:@"camera_switch"] forState:UIControlStateNormal];
    [self.cameraSwitchButton setImage:[UIImage imageNamed:@"camera_switch"] forState:UIControlStateHighlighted];
    
    [self.audioMuteButton setImage:[UIImage imageNamed:@"call_audio_mute_off_icon"] forState:UIControlStateNormal];
    [self.audioMuteButton setImage:[UIImage imageNamed:@"call_audio_mute_off_icon"] forState:UIControlStateHighlighted];
    [self.audioMuteButton setImage:[UIImage imageNamed:@"call_audio_mute_on_icon"] forState:UIControlStateSelected];
    [self.videoMuteButton setImage:[UIImage imageNamed:@"call_video_mute_off_icon"] forState:UIControlStateNormal];
    [self.videoMuteButton setImage:[UIImage imageNamed:@"call_video_mute_off_icon"] forState:UIControlStateHighlighted];
    [self.videoMuteButton setImage:[UIImage imageNamed:@"call_video_mute_on_icon"] forState:UIControlStateSelected];
    [self.speakerButton setImage:[UIImage imageNamed:@"call_speaker_off_icon"] forState:UIControlStateNormal];
    [self.speakerButton setImage:[UIImage imageNamed:@"call_speaker_on_icon"] forState:UIControlStateSelected];
    [self.chatButton setImage:[UIImage imageNamed:@"call_chat_icon"] forState:UIControlStateNormal];
    [self.chatButton setImage:[UIImage imageNamed:@"call_chat_icon"] forState:UIControlStateHighlighted];
    
    [self.endCallButton setTitle:nil forState:UIControlStateNormal];
    [self.endCallButton setTitle:nil forState:UIControlStateHighlighted];
    [self.endCallButton setImage:[UIImage imageNamed:@"call_hangup_icon"] forState:UIControlStateNormal];
    [self.endCallButton setImage:[UIImage imageNamed:@"call_hangup_icon"] forState:UIControlStateHighlighted];
    
    self.callerNameLabel.textColor = kRiotTextColorBlack;
    self.callStatusLabel.textColor = kRiotTextColorDarkGray;
    
    self.localPreviewContainerView.layer.borderColor = kRiotColorGreen.CGColor;
    self.localPreviewContainerView.layer.borderWidth = 2;
    self.localPreviewContainerView.layer.cornerRadius = 5;
    self.localPreviewContainerView.clipsToBounds = YES;
    
    self.remotePreviewContainerView.backgroundColor = [UIColor whiteColor];
    
    // Add a gradient mask programatically at the top of the screen (background of the call information (name, status))
    gradientMaskLayer = [CAGradientLayer layer];
    
    CGColorRef opaqueWhiteColor = [UIColor colorWithWhite:1.0 alpha:1.0].CGColor;
    CGColorRef transparentWhiteColor = [UIColor colorWithWhite:1.0 alpha:0].CGColor;
    
    gradientMaskLayer.colors = [NSArray arrayWithObjects:(__bridge id)opaqueWhiteColor, (__bridge id)transparentWhiteColor, nil];
    
    gradientMaskLayer.bounds = CGRectMake(0, 0, self.callContainerView.frame.size.width, self.callContainerView.frame.size.height + 20);
    gradientMaskLayer.anchorPoint = CGPointZero;

    // Define caller image view size
    CGSize size = [[UIScreen mainScreen] bounds].size;
    CGFloat minSize = MIN(size.width, size.height);
    self.callerImageViewWidthConstraint.constant = minSize / 2;
    
    // CAConstraint is not supported on IOS.
    // it seems only being supported on Mac OS.
    // so viewDidLayoutSubviews will refresh the layout bounds.
    [self.gradientMaskContainerView.layer addSublayer:gradientMaskLayer];
    
    [self updateLocalPreviewLayout];
}

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    
    // sanity check
    if (gradientMaskLayer)
    {
        CGRect currentBounds = gradientMaskLayer.bounds;
        CGRect newBounds = CGRectMake(0, 0, self.callContainerView.frame.size.width, self.callContainerView.frame.size.height + 20);
        
        // check if there is an update
        if (!CGSizeEqualToSize(currentBounds.size, newBounds.size))
        {
            newBounds.origin = CGPointZero;
            gradientMaskLayer.bounds = newBounds;
        }
    }

    // The caller image view is circular
    self.callerImageView.layer.cornerRadius = self.callerImageViewWidthConstraint.constant / 2;
    self.callerImageView.clipsToBounds = YES;
}

- (void)viewWillDisappear:(BOOL)animated
{
    if (currentAlert)
    {
        [currentAlert dismiss:NO];
        currentAlert = nil;
    }

    [super viewWillDisappear:animated];
}

- (void)dealloc
{
}

#pragma mark - override MXKViewController

- (void)destroy
{
    [super destroy];
    
    [gradientMaskLayer removeFromSuperlayer];
    gradientMaskLayer = nil;
}

#pragma mark - MXCallDelegate

- (void)call:(MXCall *)call didEncounterError:(NSError *)error
{
    if ([error.domain isEqualToString:MXEncryptingErrorDomain]
        && error.code == MXEncryptingErrorUnknownDeviceCode)
    {
        // There are unknown devices, check what the user wants to do
        __weak __typeof(self) weakSelf = self;

        MXUsersDevicesMap<MXDeviceInfo*> *unknownDevices = error.userInfo[MXEncryptingErrorUnknownDeviceDevicesKey];

        [currentAlert dismiss:NO];
        currentAlert = [[MXKAlert alloc] initWithTitle:[NSBundle mxk_localizedStringForKey:@"unknown_devices_alert_title"]
                                               message:[NSBundle mxk_localizedStringForKey:@"unknown_devices_alert"]
                                                 style:MXKAlertStyleAlert];

        [currentAlert addActionWithTitle:[NSBundle mxk_localizedStringForKey:@"unknown_devices_verify"] style:MXKAlertActionStyleDefault handler:^(MXKAlert *alert) {
            if (weakSelf)
            {
                typeof(self) self = weakSelf;
                self->currentAlert = nil;

                // Get the UsersDevicesViewController from the storyboard
                UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
                UsersDevicesViewController *usersDevicesViewController = [storyboard instantiateViewControllerWithIdentifier:@"UsersDevicesViewControllerStoryboardId"];

                [usersDevicesViewController displayUsersDevices:unknownDevices andMatrixSession:self.mainSession onComplete:^(BOOL doneButtonPressed) {

                    if (doneButtonPressed)
                    {
                        // Retry the call
                        if (call.isIncoming)
                        {
                            [call answer];
                        }
                        else
                        {
                            [call callWithVideo:call.isVideoCall];
                        }
                    }
                    else
                    {
                        // Ignore the call
                        [call hangup];
                    }
                }];

                // Show this screen within a navigation controller
                UINavigationController *usersDevicesNavigationController = [[UINavigationController alloc] init];
                [usersDevicesNavigationController pushViewController:usersDevicesViewController animated:NO];

                [self presentViewController:usersDevicesNavigationController animated:YES completion:nil];

            }
        }];

        [currentAlert addActionWithTitle:[NSBundle mxk_localizedStringForKey:(call.isIncoming ? @"unknown_devices_answer_anyway":@"unknown_devices_call_anyway")]
                                   style:MXKAlertActionStyleDefault
                                 handler:^(MXKAlert *alert) {
            if (weakSelf)
            {
                typeof(self) self = weakSelf;
                self->currentAlert = nil;

                // Acknowledge the existence of all devices
                [self startActivityIndicator];
                [self.mainSession.crypto setDevicesKnown:unknownDevices complete:^{

                    [self stopActivityIndicator];

                    // Retry the call
                    if (call.isIncoming)
                    {
                        [call answer];
                    }
                    else
                    {
                        [call callWithVideo:call.isVideoCall];
                    }
                }];
            }
        }];

        currentAlert.mxkAccessibilityIdentifier = @"CallVCUnknownDevicesAlert";
        [currentAlert showInViewController:self];
    }
    else
    {
        [super call:call didEncounterError:error];
    }
}

#pragma mark - Properties

- (UIImage*)picturePlaceholder
{
    CGFloat fontSize = floor(self.callerImageViewWidthConstraint.constant * 0.7);
    
    if (self.peer)
    {
        // Use the vector style placeholder
        return [AvatarGenerator generateAvatarForMatrixItem:self.peer.userId withDisplayName:self.peer.displayname size:self.callerImageViewWidthConstraint.constant andFontSize:fontSize];
    }
    else if (self.mxCall.room)
    {
        return [AvatarGenerator generateAvatarForMatrixItem:self.mxCall.room.roomId withDisplayName:self.mxCall.room.riotDisplayname size:self.callerImageViewWidthConstraint.constant andFontSize:fontSize];
    }
    
    return [UIImage imageNamed:@"placeholder"];
}

- (void)setMxCall:(MXCall *)call
{
    [super setMxCall:call];
    
    self.callerImageView.hidden = self.mxCall.isVideoCall;
}

- (void)updatePeerInfoDisplay
{
    NSString *peerDisplayName;
    NSString *peerAvatarURL;
    
    if (self.peer)
    {
        peerDisplayName = [self.peer displayname];
        if (!peerDisplayName.length)
        {
            peerDisplayName = self.peer.userId;
        }
        peerAvatarURL = self.peer.avatarUrl;
    }
    else if (self.mxCall.isConferenceCall)
    {
        peerDisplayName = self.mxCall.room.riotDisplayname;
        peerAvatarURL = self.mxCall.room.state.avatar;
    }
    
    self.callerNameLabel.text = peerDisplayName;
    
    self.callerImageView.contentMode = UIViewContentModeScaleAspectFill;
    if (peerAvatarURL)
    {
        // Retrieve the avatar in full resolution
        NSString *avatarThumbURL = [self.mainSession.matrixRestClient urlOfContent:peerAvatarURL];
        [self.callerImageView setImageURL:avatarThumbURL withType:nil andImageOrientation:UIImageOrientationUp previewImage:self.picturePlaceholder];
    }
    else
    {
        self.callerImageView.image = self.picturePlaceholder;
    }
}

- (void)showOverlayContainer:(BOOL)isShown
{
    [super showOverlayContainer:isShown];
    
    self.gradientMaskContainerView.hidden = self.overlayContainerView.isHidden;
}

#pragma mark - Sounds

- (NSURL*)audioURLWithName:(NSString*)soundName
{
    NSURL *audioUrl;
    
    NSString *path = [[NSBundle mainBundle] pathForResource:soundName ofType:@"mp3"];
    if (path)
    {
        audioUrl = [NSURL fileURLWithPath:path];
    }
    
    // Use by default the matrix kit sounds.
    if (!audioUrl)
    {
        audioUrl = [super audioURLWithName:soundName];
    }
    
    return audioUrl;
}

#pragma mark - Actions

- (IBAction)onButtonPressed:(id)sender
{
    if (sender == _chatButton)
    {
        if (self.delegate)
        {
            // Dismiss the view controller whereas the call is still running
            [self.delegate dismissCallViewController:self completion:^{
                
                if (self.mxCall.room)
                {
                    // Open the room page
                    [[AppDelegate theDelegate] showRoom:self.mxCall.room.state.roomId andEventId:nil withMatrixSession:self.mxCall.room.mxSession];
                }
                
            }];            
        }
    }
    else
    {
        [super onButtonPressed:sender];
    }
}

@end