/*
 Copyright 2015 OpenMarket 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 "HomeViewController.h"

#import "RecentsDataSource.h"
#import "RecentsViewController.h"

@interface HomeViewController ()
{
    // The search bar
    UISearchBar *searchBar;

    RecentsViewController *recentsViewController;
    RecentsDataSource *recentsDataSource;

    // Display a gradient view above the screen
    CAGradientLayer* tableViewMaskLayer;

    // Display a button to a new room
    UIImageView* createNewRoomImageView;

    // Backup of view when displaying search
    UIView *backupTitleView;
    UIBarButtonItem *backupLeftBarButtonItem;
    UIBarButtonItem *backupRightBarButtonItem;
}

@end

@implementation HomeViewController

- (void)displayWithSession:(MXSession *)session
{
    // to display a red navbar when the home server cannot be reached.
    [self addMatrixSession:session];
}

- (void)viewDidLoad
{
    // Set up the SegmentedVC tabs before calling [super viewDidLoad]
    MXSession *session = self.mxSessions[0];

    NSMutableArray* viewControllers = [[NSMutableArray alloc] init];
    NSMutableArray* titles = [[NSMutableArray alloc] init];

    [titles addObject: NSLocalizedStringFromTable(@"Rooms", @"Vector", nil)];
    recentsViewController = [RecentsViewController recentListViewController];
    recentsDataSource = [[RecentsDataSource alloc] initWithMatrixSession:session];
    [recentsViewController displayList:recentsDataSource];
    [viewControllers addObject:recentsViewController];

    [titles addObject: NSLocalizedStringFromTable(@"Messages", @"Vector", nil)];
    MXKViewController *tempMessagesVC = [[MXKViewController alloc] init];
    [viewControllers addObject:tempMessagesVC];

    [titles addObject: NSLocalizedStringFromTable(@"People", @"Vector", nil)];
    MXKViewController *tempPeopleVC = [[MXKViewController alloc] init];
    [viewControllers addObject:tempPeopleVC];

    [self initWithTitles:titles viewControllers:viewControllers defaultSelected:0];

    [super viewDidLoad];

    self.navigationItem.title = NSLocalizedStringFromTable(@"recents", @"Vector", nil);
    
    self.backgroundImageView.image = [UIImage imageNamed:@"search_bg"];

    // Search bar
    searchBar = [[UISearchBar alloc] init];
    searchBar.showsCancelButton = YES;
    searchBar.delegate = self;
}

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

    // Let's child display the loading not the home view controller
    [self.activityIndicator stopAnimating];
    self.activityIndicator = nil;

    [self hideSearch:NO];

    if (!tableViewMaskLayer)
    {
        tableViewMaskLayer = [CAGradientLayer layer];

        CGColorRef opaqueWhiteColor = [UIColor colorWithWhite:1.0 alpha:1.0].CGColor;
        CGColorRef transparentWhiteColor = [UIColor colorWithWhite:1.0 alpha:0].CGColor;

        tableViewMaskLayer.colors = [NSArray arrayWithObjects:(__bridge id)transparentWhiteColor, (__bridge id)transparentWhiteColor, (__bridge id)opaqueWhiteColor, nil];

        // display a gradient to the rencents bottom (20% of the bottom of the screen)
        tableViewMaskLayer.locations = [NSArray arrayWithObjects:
                                        [NSNumber numberWithFloat:0],
                                        [NSNumber numberWithFloat:0.8],
                                        [NSNumber numberWithFloat:1.0], nil];

        tableViewMaskLayer.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
        tableViewMaskLayer.anchorPoint = CGPointZero;

        // CAConstraint is not supported on IOS.
        // it seems only being supported on Mac OS.
        // so viewDidLayoutSubviews will refresh the layout bounds.
        [self.view.layer addSublayer:tableViewMaskLayer];
    }

    if (!createNewRoomImageView)
    {
        createNewRoomImageView = [[UIImageView alloc] init];
        [createNewRoomImageView setTranslatesAutoresizingMaskIntoConstraints:NO];
        [self.view addSubview:createNewRoomImageView];

        createNewRoomImageView.backgroundColor = [UIColor clearColor];
        createNewRoomImageView.image = [UIImage imageNamed:@"create_room"];

        CGFloat side = 50.0f;
        NSLayoutConstraint* widthConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                           attribute:NSLayoutAttributeWidth
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:nil
                                                                           attribute:NSLayoutAttributeNotAnAttribute
                                                                          multiplier:1
                                                                            constant:side];

        NSLayoutConstraint* heightConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                            attribute:NSLayoutAttributeHeight
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:nil
                                                                            attribute:NSLayoutAttributeNotAnAttribute
                                                                           multiplier:1
                                                                             constant:side];

        NSLayoutConstraint* centerXConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                             attribute:NSLayoutAttributeCenterX
                                                                             relatedBy:NSLayoutRelationEqual
                                                                                toItem:self.view
                                                                             attribute:NSLayoutAttributeCenterX
                                                                            multiplier:1
                                                                              constant:0];

        NSLayoutConstraint* bottomConstraint = [NSLayoutConstraint constraintWithItem:self.view
                                                                            attribute:NSLayoutAttributeBottom
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:createNewRoomImageView
                                                                            attribute:NSLayoutAttributeBottom
                                                                           multiplier:1
                                                                             constant:50];

        if ([NSLayoutConstraint respondsToSelector:@selector(activateConstraints:)])
        {
            [NSLayoutConstraint activateConstraints:@[widthConstraint, heightConstraint, centerXConstraint, bottomConstraint]];
        }
        else
        {
            [createNewRoomImageView addConstraint:widthConstraint];
            [createNewRoomImageView addConstraint:heightConstraint];

            [self.view addConstraint:bottomConstraint];
            [self.view addConstraint:centerXConstraint];
        }

        createNewRoomImageView.userInteractionEnabled = YES;

        // tap -> switch to text edition
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onNewRoomPressed)];
        [tap setNumberOfTouchesRequired:1];
        [tap setNumberOfTapsRequired:1];
        [tap setDelegate:self];
        [createNewRoomImageView addGestureRecognizer:tap];
    }

    // TODO: a dedicated segmented viewWillAppear may be more appropriate
    [self.displayedViewController viewWillAppear:animated];
}

- (void) viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];

    // sanity check
    if (tableViewMaskLayer)
    {
        CGRect currentBounds = tableViewMaskLayer.bounds;
        CGRect newBounds = CGRectIntegral(self.view.frame);

        // check if there is an update
        if (!CGSizeEqualToSize(currentBounds.size, newBounds.size))
        {
            newBounds.origin = CGPointZero;
            tableViewMaskLayer.bounds = newBounds;
        }
    }
}

/*
 #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

#pragma mark - Search

- (void)showSearch:(BOOL)animated
{
    backupTitleView = self.navigationItem.titleView;
    backupLeftBarButtonItem = self.navigationItem.leftBarButtonItem;
    backupRightBarButtonItem = self.navigationItem.rightBarButtonItem;

    // Remove navigation buttons
    self.navigationItem.rightBarButtonItem = nil;
    self.navigationItem.leftBarButtonItem = nil;

    // Add the search bar and
    self.navigationItem.titleView = searchBar;
    [searchBar becomeFirstResponder];

    // Show the tabs header
    if (animated)
    {
        [self updateSearch];

        [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
                         animations:^{

                             self.selectionContainerHeightConstraint.constant = 44;
                             [self.view layoutIfNeeded];
                         }
                         completion:^(BOOL finished){
                         }];
    }
    else
    {
        [self updateSearch];
        self.selectionContainerHeightConstraint.constant = 44;
        [self.view layoutIfNeeded];
    }
}

- (void)hideSearch:(BOOL)animated
{
    if (backupLeftBarButtonItem)
    {
        self.navigationItem.titleView = backupTitleView;
        self.navigationItem.leftBarButtonItem = backupLeftBarButtonItem;
        self.navigationItem.rightBarButtonItem = backupRightBarButtonItem;
    }

    // Hide the tabs header
    if (animated)
    {
        [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
                         animations:^{

                             self.selectionContainerHeightConstraint.constant = 0;
                             [self.view layoutIfNeeded];
                         }
                         completion:nil];
    }
    else
    {
        self.selectionContainerHeightConstraint.constant = 0;
        [self.view layoutIfNeeded];
    }

    // Go back under the recents tab
    // TODO: Open the feature in SegmentedVC
    [recentsDataSource searchWithPatterns:nil];
    self.displayedViewController.view.hidden = NO;
}

// Update search results under the currently selected tab
- (void)updateSearch
{
    if (searchBar.text.length)
    {
        self.displayedViewController.view.hidden = NO;

        // Forward the search request to the data source
        if (self.displayedViewController == recentsViewController)
        {
            [recentsDataSource searchWithPatterns:@[searchBar.text]];
        }
    }
    else
    {
        // Nothing to search = Show nothing
        self.displayedViewController.view.hidden = YES;
    }
}

#pragma mark - UISearchBarDelegate

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if (self.displayedViewController == recentsViewController)
    {
        // As the search is local, it can be updated on each text change
        [self updateSearch];
    }
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar2
{
    // "Search" key has been pressed
    [searchBar resignFirstResponder];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar2
{
    [self hideSearch:YES];
}

#pragma mark - Actions

- (IBAction)onButtonPressed:(id)sender
{
    if (sender == _searchBarButtonIem)
    {
        [self showSearch:YES];
    }
}

- (void)onNewRoomPressed
{
    [self performSegueWithIdentifier:@"presentRoomCreationStep1" sender:self];
}

@end