/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  The first view controller in the application.  Shows the application logo and navigation buttons.

 */

#import "AAPLStartViewController.h"

#import "AAPLStyleUtilities.h"

#import "AAPLProfileViewController.h"

#import "AAPLMatchesViewController.h"

static const CGFloat AAPLButtonToButtonVerticalSpacing = 10.0;

static const CGFloat AAPLLogoPadding = 30.0;

@implementation AAPLStartViewController

- (instancetype)init {

    self = [super init];

    if (self) {

        self.title = NSLocalizedString(@"HelloGoodbye", @"Title of the start page");

        self.backgroundImage = [UIImage imageNamed:@"couple"];

    }

    return self;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    UIView *containerView = self.view;

    UIView *logoOverlayView = [[UIView alloc] init];

    logoOverlayView.backgroundColor = [AAPLStyleUtilities overlayColor];

    logoOverlayView.layer.cornerRadius = [AAPLStyleUtilities overlayCornerRadius];

    logoOverlayView.translatesAutoresizingMaskIntoConstraints = NO;

    [containerView addSubview:logoOverlayView];

    UIImageView *logo = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo"]];

    logo.isAccessibilityElement = YES;

    logo.accessibilityLabel = NSLocalizedString(@"Hello goodbye, meet your match", @"Logo description");

    logo.translatesAutoresizingMaskIntoConstraints = NO;

    [containerView addSubview:logo];

    UIButton *profileButton = [self roundedRectButtonWithTitle:NSLocalizedString(@"Profile", @"Title of the profile page") action:@selector(showProfile)];

    [containerView addSubview:profileButton];

    UIButton *matchesButton = [self roundedRectButtonWithTitle:NSLocalizedString(@"Matches", @"Title of the matches page") action:@selector(showMatches)];

    [containerView addSubview:matchesButton];

    NSMutableArray *constraints = [NSMutableArray array];

    // Use dummy views space the top of the view, the logo, the buttons, and the bottom of the view evenly apart

    UIView *topDummyView = [self addDummyViewToContainerView:containerView alignedOnTopWithItem:[self topLayoutGuide] onBottomWithItem:logoOverlayView constraints:constraints];

    UIView *middleDummyView = [self addDummyViewToContainerView:containerView alignedOnTopWithItem:logoOverlayView onBottomWithItem:profileButton constraints:constraints];

    UIView *bottomDummyView = [self addDummyViewToContainerView:containerView alignedOnTopWithItem:matchesButton onBottomWithItem:[self bottomLayoutGuide] constraints:constraints];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:topDummyView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:middleDummyView attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0.0]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:middleDummyView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:bottomDummyView attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0.0]];

    // Position the logo

    [constraints addObjectsFromArray:

     @[

       [NSLayoutConstraint constraintWithItem:logoOverlayView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:topDummyView attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:logoOverlayView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:logoOverlayView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:middleDummyView attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:logo attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeTop multiplier:1.0 constant:AAPLLogoPadding],

       [NSLayoutConstraint constraintWithItem:logo attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeBottom multiplier:1.0 constant:-AAPLLogoPadding],

       [NSLayoutConstraint constraintWithItem:logo attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeLeading multiplier:1.0 constant:AAPLLogoPadding],

       [NSLayoutConstraint constraintWithItem:logo attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:-AAPLLogoPadding]

       ]];

    // Position the profile button

    [constraints addObject:[NSLayoutConstraint constraintWithItem:profileButton attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:profileButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:middleDummyView attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];

    // Put the matches button below the profile button

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:profileButton attribute:NSLayoutAttributeBottom multiplier:1.0 constant:AAPLButtonToButtonVerticalSpacing]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:bottomDummyView attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]];

    // Align the left and right edges of the two buttons and the logo

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:profileButton attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:profileButton attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:0.0]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0]];

    [constraints addObject:[NSLayoutConstraint constraintWithItem:matchesButton attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:logoOverlayView attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:0.0]];

    [containerView addConstraints:constraints];

}

- (UIView *)addDummyViewToContainerView:(UIView *)containerView alignedOnTopWithItem:(id)topItem onBottomWithItem:(id)bottomItem constraints:(NSMutableArray *)constraints

{

    UIView *dummyView = [[UIView alloc] init];

    dummyView.translatesAutoresizingMaskIntoConstraints = NO;

    [containerView addSubview:dummyView];

    // The horizontal layout of the dummy view does not matter, but for completeness, we give it a width of 0 and center it horizontally.

    [constraints addObjectsFromArray:

     @[

       [NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:topItem attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0],

       [NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:bottomItem attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]

       ]];

    return dummyView;

}

- (UIButton *)roundedRectButtonWithTitle:(NSString *)title action:(SEL)action {

    UIButton *button = [AAPLStyleUtilities overlayRoundedRectButton];

    [button setTitle:title forState:UIControlStateNormal];

    [button addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];

    return button;

}

- (void)showProfile {

    AAPLProfileViewController *profileViewController = [[AAPLProfileViewController alloc] init];

    [self.navigationController pushViewController:profileViewController animated:YES];

}

- (void)showMatches {

    AAPLMatchesViewController *matchesViewController = [[AAPLMatchesViewController alloc] init];

    [self.navigationController pushViewController:matchesViewController animated:YES];

}

@end