/*
 * Copyright (c) 2021 BWI GmbH
 *
 * 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 "RecentsBannerViewController.h"
#import "GeneratedInterface-Swift.h"

@interface RecentsBannerViewController ()
{
    TopBannerViewController *topBannerViewController;
    bool bannersInitialized;
    bool isBannerVisible;
    bool shouldHideBanner;
}
- (void)setTopBannerViewConstraints;
- (void)showTopBanner;
- (void)hideTopBanner;
@end

@implementation RecentsBannerViewController

+ (bool)isBannerHidden {
    NSDictionary *info = [[NSBundle mainBundle] infoDictionary];
    NSString *version = [info objectForKey:@"CFBundleShortVersionString"];
    if( [version isEqual:[[NSUserDefaults standardUserDefaults] objectForKey:@"de.bwi.messenger.top_banner_confirmation"]] )
        return TRUE;
    else
        return FALSE;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    bannersInitialized = FALSE;
    isBannerVisible = FALSE;
    shouldHideBanner = FALSE;
}

- (void)onMatrixSessionChange
{
    [super onMatrixSessionChange];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    if( [BWIBuildSettings.shared showTopBanner] ) {
        [self showTopBanner];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    if( bannersInitialized && [BWIBuildSettings.shared showTopBanner] ) {
        [self hideTopBanner];
    }
}

- (void)setTopBannerViewConstraints
{
    // get the offset in the y-coordiante so that the banner appears below the navigation bar
    UIWindow *window = UIApplication.sharedApplication.windows.firstObject;
    CGFloat statusBarHeight = window.safeAreaInsets.top;
    CGFloat navigationBarHeight = self.navigationController.navigationBar.frame.size.height;

    NSLayoutConstraint *alignTopConstraint = [NSLayoutConstraint
                                              constraintWithItem:topBannerViewController.view
                                              attribute:NSLayoutAttributeTop
                                              relatedBy:NSLayoutRelationEqual
                                              toItem:self.view
                                              attribute:NSLayoutAttributeTop
                                          multiplier:1.0
                                          constant:statusBarHeight + navigationBarHeight];
    [[self view] addConstraint:alignTopConstraint];
    
    NSLayoutConstraint *alignLeadingConstraint = [NSLayoutConstraint
                                                  constraintWithItem:topBannerViewController.view
                                                  attribute:NSLayoutAttributeLeading
                                                  relatedBy:NSLayoutRelationEqual
                                                  toItem:self.view
                                                  attribute:NSLayoutAttributeLeading
                                                  multiplier:1.0
                                                  constant:0];
    [[self view] addConstraint:alignLeadingConstraint];
    
    NSLayoutConstraint *alignTrailingConstraint = [NSLayoutConstraint
                                                   constraintWithItem:topBannerViewController.view
                                                   attribute:NSLayoutAttributeTrailing
                                                   relatedBy:NSLayoutRelationEqual
                                                   toItem:self.view
                                                   attribute:NSLayoutAttributeTrailing
                                                   multiplier:1.0
                                                   constant:0];
    [[self view] addConstraint:alignTrailingConstraint];
    
    NSLayoutConstraint *heightConstraint = [NSLayoutConstraint
                                            constraintWithItem:topBannerViewController.view
                                            attribute:NSLayoutAttributeHeight
                                            relatedBy:NSLayoutRelationEqual
                                            toItem:NULL
                                            attribute:NSLayoutAttributeNotAnAttribute
                                            multiplier:1.0
                                            constant:130];
    [[self view] addConstraint:heightConstraint];
}

- (void)setupTopBanner
{
    NSMutableArray *bannerControllers = [NSMutableArray array];
    
    MXSession* session = [self mainSession];
    if( !session || bannersInitialized)
        return;
    
    NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
    
    FeatureBannerVisibilityService *service = [[FeatureBannerVisibilityService alloc] initWithMxSession:session];
    [service isUnreadWithVersion:version completion:^(BOOL unread) {
        if (unread) {
            //[bannerControllers addObject:[[FeatureBannerViewController alloc] initWithSession:session version:version]];
            
            self->topBannerViewController = [[TopBannerViewController alloc] initWithControllers: bannerControllers];
            
            // this notification will be called either if the user clicked on the banner or wants to hide it using a swipe gesture
            [[NSNotificationCenter defaultCenter] addObserverForName:@"de.bwi.messenger.hide_top_banner" object:NULL queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notification) {
                [self hideTopBanner];
                [self->topBannerViewController removeAdvertiseViewControllers];
            }];
            
            // this notification will be called either if the user clicked on the banner or wants to hide it using a swipe gesture
            [[NSNotificationCenter defaultCenter] addObserverForName:@"de.bwi.messenger.mark_top_banner_as_read" object:NULL queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notification) {
                shouldHideBanner = TRUE;
            }];
            
             self->bannersInitialized = TRUE;
            
            if( [BWIBuildSettings.shared showTopBanner] ) {
                [self showTopBanner];
            }
        }
    }];
    
}

- (void)showTopBanner
{
    if( isBannerVisible || shouldHideBanner) {
        return;   // nothing to do because the banner is already visible for the user
    }
  
    if( [topBannerViewController.advertiseViewControllers count] > 0 )
    {
        // add child view controller
        [self addChildViewController:topBannerViewController];
        [[topBannerViewController view] setTranslatesAutoresizingMaskIntoConstraints:FALSE];
        [[topBannerViewController view] setBounds:CGRectMake(0, 0, self.view.bounds.size.width, 100)];
        [[self view] addSubview:[topBannerViewController view]];
        [topBannerViewController didMoveToParentViewController:self];
        
        [self setTopBannerViewConstraints];
        
        isBannerVisible = TRUE;
    }
}

- (void)hideTopBanner
{
    if( [[topBannerViewController advertiseViewControllers] count] > 0 )
    {
        // remove child view controller
        [topBannerViewController willMoveToParentViewController:nil];
        [topBannerViewController.view removeFromSuperview];
        [topBannerViewController removeFromParentViewController];
    }
    
    isBannerVisible = FALSE;
}

@end