#import "TabsController.h"

#import "CustomStyle.h"  // Custom fonts
#import "UIView+Sizes.h" // Helpers to set view sizes

@interface TabsController()
@property (nonatomic, retain) IBOutlet UIView *mainMenuView;   // Main view for custom tabbar
@property (nonatomic, retain) IBOutlet UIView *menuSliderView; // Slider view (you drag/touch slider to expand/close menu)
@property (nonatomic, retain) IBOutletCollection(UIButton) NSArray *menuButtons; // Tab buttons

@property (nonatomic, assign) BOOL isMenuOpened;
@end

@implementation TabsController

@synthesize mainMenuView   = _mainMenuView;
@synthesize menuSliderView = _menuSliderView;
@synthesize menuButtons    = _menuButtons;

@synthesize isMenuOpened = _isMenuOpened;

#pragma mark - Object lifecycle

- (void) dealloc
{
    self.mainMenuView = nil;
    self.menuSliderView = nil;
    self.menuButtons  = nil;
    [super dealloc];
}

#pragma mark - View lifecycle

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

    if (self.mainMenuView.superview == nil) {
        // Resize main view, because collapsed menu is smaller than tabbar view
        [[self.view.subviews objectAtIndex:0] setFrame:CGRectMake(0, 0, 320, 480 - self.menuSliderView.height)];

        // Position for menu
        self.mainMenuView.y = self.view.height - self.menuSliderView.height;
        // Add menu over tabbar. Don't forget to hide tabbar in nib file
        [self.view addSubview:self.mainMenuView];

        // Just font customization
        for (UIButton *menuButton in self.menuButtons) {
            menuButton.titleLabel.font = [CustomStyle regularFontWithSize:26];
        }

        // gesture for dragging
        UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(onMenuSliderPan:)];
        panGesture.minimumNumberOfTouches = 1;
        [self.menuSliderView addGestureRecognizer:panGesture];
        [panGesture release];

        // Gesture for tap
        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onMenuSliderTap:)];
        [self.menuSliderView addGestureRecognizer:tapGesture];
        [tapGesture release];

        self.isMenuOpened = NO;
    }
}

// Get button for specified tab index
- (void)selectMenuButtonForIndex:(NSUInteger)idx
{
    for (NSUInteger i = 0; i < self.menuButtons.count; ++i) {
        UIButton *button = [self.menuButtons objectAtIndex:i];
        button.selected = i == idx;
    }
}

#pragma mark - Private

// Override setting current tab item
- (void)setSelectedIndex:(NSUInteger)selectedIndex
{
    [super setSelectedIndex:selectedIndex];
    [self selectMenuButtonForIndex:selectedIndex]; // Set state for custom button associated with selected tab
    [self closeMenu];
}

// Animation to expand menu
- (void)openMenu
{
    if (self.mainMenuView.y <= self.view.height - self.mainMenuView.height) {
        return;
    }
    [UIView animateWithDuration:0.2 animations:^{
        self.mainMenuView.y = self.view.height - self.mainMenuView.height;
    } completion:^(BOOL finished){
        self.isMenuOpened = YES;
    }];
}

// Animation to collapse meny
- (void)closeMenu
{
    if (self.mainMenuView.y >= self.view.height - self.menuSliderView.height) {
        return;
    }
    [UIView animateWithDuration:0.2 animations:^{
        self.mainMenuView.y = self.view.height - self.menuSliderView.height;
    } completion:^(BOOL finished){
        self.isMenuOpened = NO;
    }];
}

#pragma mark - Actions

// On tap on button in main menu
- (IBAction)onMenuItem:(UIButton *)menuButton
{
    NSUInteger idx = [self.menuButtons indexOfObject:menuButton];
    [self setSelectedIndex:idx];
}

// Support for dragging
- (void)onMenuSliderPan:(UIPanGestureRecognizer *)panGesture
{
    if (panGesture.state == UIGestureRecognizerStateBegan || panGesture.state == UIGestureRecognizerStateChanged) {
        CGPoint translation = [panGesture translationInView:self.view];
        CGFloat newY = self.mainMenuView.y += translation.y;
        newY = MAX(newY, self.view.height - self.mainMenuView.height);
        newY = MIN(newY, self.view.height - self.menuSliderView.height);
        self.mainMenuView.y = newY;
        [panGesture setTranslation:CGPointZero inView:self.view];
    } else if (panGesture.state == UIGestureRecognizerStateEnded) {
        if (self.isMenuOpened) {
            if (self.mainMenuView.y > (self.view.height - (self.mainMenuView.height / 3) * 2)) {
                [self closeMenu];
            } else {
                [self openMenu];
            }
        } else {
            if (self.mainMenuView.y < (self.view.height - self.mainMenuView.height / 3)) {
                [self openMenu];
            } else {
                [self closeMenu];
            }
        }
    }
}

// Support for tap
- (void)onMenuSliderTap:(UITapGestureRecognizer *)tapGesture
{
    if (self.isMenuOpened) {
        [self closeMenu];
    } else {
        [self openMenu];
    }
}

@end