//
//  JDStatusBarNotification.m
//
//  Based on KGStatusBar by Kevin Gibbon
//
//  Created by Markus Emrich on 10/28/13.
//  Copyright 2013 Markus Emrich. All rights reserved.
//

#import <QuartzCore/QuartzCore.h>

#import "JDStatusBarNotification.h"

@interface JDStatusBarStyle (Hidden)
+ (NSArray*)allDefaultStyleIdentifier;
+ (JDStatusBarStyle*)defaultStyleWithName:(NSString*)styleName;
@end

@interface JDStatusBarNotificationViewController : UIViewController
@end

@interface UIApplication (mainWindow)
- (UIWindow*)mainApplicationWindowIgnoringWindow:(UIWindow*)ignoringWindow;
@end

@interface JDStatusBarNotification () <CAAnimationDelegate>
@property (nonatomic, strong, readonly) UIWindow *overlayWindow;
@property (nonatomic, strong, readonly) UIView *progressView;
@property (nonatomic, strong, readonly) JDStatusBarView *topBar;

@property (nonatomic, strong) NSTimer *dismissTimer;
@property (nonatomic, assign) CGFloat progress;

@property (nonatomic, weak) JDStatusBarStyle *activeStyle;
@property (nonatomic, strong) JDStatusBarStyle *defaultStyle;
@property (nonatomic, strong) NSMutableDictionary *userStyles;
@end

@implementation JDStatusBarNotification

@synthesize overlayWindow = _overlayWindow;
@synthesize progressView = _progressView;
@synthesize topBar = _topBar;

#pragma mark Class methods

+ (JDStatusBarNotification*)sharedInstance {
  static dispatch_once_t once;
  static JDStatusBarNotification *sharedInstance;
  dispatch_once(&once, ^ {
    sharedInstance = [[self alloc] init];
  });
  return sharedInstance;
}

+ (UIView*)showWithStatus:(NSString *)status;
{
  return [[self sharedInstance] showWithStatus:status
                                     styleName:nil];
}

+ (UIView*)showWithStatus:(NSString *)status
                styleName:(NSString*)styleName;
{
  return [[self sharedInstance] showWithStatus:status
                                     styleName:styleName];
}

+ (UIView*)showWithStatus:(NSString *)status
             dismissAfter:(NSTimeInterval)timeInterval;
{
  UIView *view = [[self sharedInstance] showWithStatus:status
                                             styleName:nil];
  [self dismissAfter:timeInterval];
  return view;
}

+ (UIView*)showWithStatus:(NSString *)status
             dismissAfter:(NSTimeInterval)timeInterval
                styleName:(NSString*)styleName;
{
  UIView *view = [[self sharedInstance] showWithStatus:status
                                             styleName:styleName];
  [self dismissAfter:timeInterval];
  return view;
}

+ (void)dismiss;
{
  [self dismissAnimated:YES];
}

+ (void)dismissAnimated:(BOOL)animated;
{
  [[self sharedInstance] dismissAnimated:animated];
}

+ (void)dismissAfter:(NSTimeInterval)delay;
{
  [[self sharedInstance] setDismissTimerWithInterval:delay];
}

+ (void)setDefaultStyle:(JDPrepareStyleBlock)prepareBlock;
{
  NSAssert(prepareBlock != nil, @"No prepareBlock provided");

  JDStatusBarStyle *style = [[self sharedInstance].defaultStyle copy];
  [self sharedInstance].defaultStyle = prepareBlock(style);
}

+ (NSString*)addStyleNamed:(NSString*)identifier
                   prepare:(JDPrepareStyleBlock)prepareBlock;
{
  return [[self sharedInstance] addStyleNamed:identifier
                                      prepare:prepareBlock];
}

+ (void)showProgress:(CGFloat)progress;
{
  [[self sharedInstance] setProgress:progress];
}

+ (void)showActivityIndicator:(BOOL)show indicatorStyle:(UIActivityIndicatorViewStyle)style;
{
  [[self sharedInstance] showActivityIndicator:show indicatorStyle:style];
}

+ (BOOL)isVisible;
{
  return [[self sharedInstance] isVisible];
}

#pragma mark Implementation

- (id)init
{
  if ((self = [super init]))
  {
    // set defaults
    [self setupDefaultStyles];

    // register for orientation changes
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willChangeStatusBarFrame:)
                                                 name:UIApplicationWillChangeStatusBarFrameNotification object:nil];
  }
  return self;
}

- (void)dealloc
{
  [[NSNotificationCenter defaultCenter] removeObserver:self];
}

#pragma mark Custom styles

- (void)setupDefaultStyles;
{
  self.defaultStyle = [JDStatusBarStyle defaultStyleWithName:JDStatusBarStyleDefault];

  self.userStyles = [NSMutableDictionary dictionary];
  for (NSString *styleName in [JDStatusBarStyle allDefaultStyleIdentifier]) {
    [self.userStyles setObject:[JDStatusBarStyle defaultStyleWithName:styleName] forKey:styleName];
  }
}

- (NSString*)addStyleNamed:(NSString*)identifier
                   prepare:(JDPrepareStyleBlock)prepareBlock;
{
  NSAssert(identifier != nil, @"No identifier provided");
  NSAssert(prepareBlock != nil, @"No prepareBlock provided");

  JDStatusBarStyle *style = [self.defaultStyle copy];
  [self.userStyles setObject:prepareBlock(style) forKey:identifier];
  return identifier;
}

#pragma mark Presentation

- (UIView*)showWithStatus:(NSString *)status
                styleName:(NSString*)styleName;
{
  JDStatusBarStyle *style = nil;
  if (styleName != nil) {
    style = self.userStyles[styleName];
  }

  if (style == nil) style = self.defaultStyle;
  return [self showWithStatus:status style:style];
}

- (UIView*)showWithStatus:(NSString *)status
                    style:(JDStatusBarStyle*)style;
{
  // first, check if status bar is visible at all
  if ([UIApplication sharedApplication].statusBarHidden) return nil;

  // prepare for new style
  if (style != self.activeStyle) {
    self.activeStyle = style;
    if (self.activeStyle.animationType == JDStatusBarAnimationTypeFade) {
      self.topBar.alpha = 0.0;
      self.topBar.transform = CGAffineTransformIdentity;
    } else {
      self.topBar.alpha = 1.0;
      self.topBar.transform = CGAffineTransformMakeTranslation(0, -self.topBar.frame.size.height);
    }
  }

  // cancel previous dismissing & remove animations
  [[NSRunLoop currentRunLoop] cancelPerformSelector:@selector(dismiss) target:self argument:nil];
  [self.topBar.layer removeAllAnimations];

  // create & show window
  [self.overlayWindow setHidden:NO];

  // update style
  self.topBar.backgroundColor = style.barColor;
  self.topBar.textVerticalPositionAdjustment = style.textVerticalPositionAdjustment;
  UILabel *textLabel = self.topBar.textLabel;
  textLabel.textColor = style.textColor;
  textLabel.font = style.font;
  textLabel.accessibilityLabel = status;
  textLabel.text = status;

  if (style.textShadow) {
    textLabel.shadowColor = style.textShadow.shadowColor;
    textLabel.shadowOffset = style.textShadow.shadowOffset;
  } else {
    textLabel.shadowColor = nil;
    textLabel.shadowOffset = CGSizeZero;
  }

  // reset progress & activity
  self.progress = 0.0;
  [self showActivityIndicator:NO indicatorStyle:0];

  // animate in
  BOOL animationsEnabled = (style.animationType != JDStatusBarAnimationTypeNone);
  if (animationsEnabled && style.animationType == JDStatusBarAnimationTypeBounce) {
    [self animateInWithBounceAnimation];
  } else {
    [UIView animateWithDuration:(animationsEnabled ? 0.4 : 0.0) animations:^{
      self.topBar.alpha = 1.0;
      self.topBar.transform = CGAffineTransformIdentity;
    }];
  }

  return self.topBar;
}

#pragma mark Dismissal

- (void)setDismissTimerWithInterval:(NSTimeInterval)interval;
{
  [self.dismissTimer invalidate];
  self.dismissTimer = [[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:interval]
                                               interval:0 target:self selector:@selector(dismiss:) userInfo:nil repeats:NO];
  [[NSRunLoop currentRunLoop] addTimer:self.dismissTimer forMode:NSRunLoopCommonModes];
}

- (void)dismiss:(NSTimer*)timer;
{
  [self dismissAnimated:YES];
}

- (void)dismissAnimated:(BOOL)animated;
{
  [self.dismissTimer invalidate];
  self.dismissTimer = nil;

  // check animation type
  BOOL animationsEnabled = (self.activeStyle.animationType != JDStatusBarAnimationTypeNone);
  animated &= animationsEnabled;

  dispatch_block_t animation = ^{
    if (self.activeStyle.animationType == JDStatusBarAnimationTypeFade) {
      self.topBar.alpha = 0.0;
    } else {
      self.topBar.transform = CGAffineTransformMakeTranslation(0, -self.topBar.frame.size.height);
    }
  };

  void(^complete)(BOOL) = ^(BOOL finished) {
    [self.overlayWindow removeFromSuperview];
    [self.overlayWindow setHidden:YES];
    _overlayWindow.rootViewController = nil;
    _overlayWindow = nil;
    _progressView = nil;
    _topBar = nil;
  };

  if (animated) {
    // animate out
    [UIView animateWithDuration:0.4 animations:animation completion:complete];
  } else {
    animation();
    complete(YES);
  }
}

#pragma mark Bounce Animation

- (void)animateInWithBounceAnimation;
{
  //don't animate in, if topBar is already fully visible
  if (self.topBar.frame.origin.y >= 0) {
    return;
  }

  // easing function (based on github.com/robb/RBBAnimation)
  CGFloat(^RBBEasingFunctionEaseOutBounce)(CGFloat) = ^CGFloat(CGFloat t) {
    if (t < 4.0 / 11.0) return pow(11.0 / 4.0, 2) * pow(t, 2);
    if (t < 8.0 / 11.0) return 3.0 / 4.0 + pow(11.0 / 4.0, 2) * pow(t - 6.0 / 11.0, 2);
    if (t < 10.0 / 11.0) return 15.0 /16.0 + pow(11.0 / 4.0, 2) * pow(t - 9.0 / 11.0, 2);
    return 63.0 / 64.0 + pow(11.0 / 4.0, 2) * pow(t - 21.0 / 22.0, 2);
  };

  // create values
  int fromCenterY=-20, toCenterY=0, animationSteps=100;
  NSMutableArray *values = [NSMutableArray arrayWithCapacity:animationSteps];
  for (int t = 1; t<=animationSteps; t++) {
    float easedTime = RBBEasingFunctionEaseOutBounce((t*1.0)/animationSteps);
    float easedValue = fromCenterY + easedTime * (toCenterY-fromCenterY);
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, easedValue, 0)]];
  }

  // build animation
  CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
  animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
  animation.duration = 0.66;
  animation.values = values;
  animation.removedOnCompletion = NO;
  animation.fillMode = kCAFillModeForwards;
  animation.delegate = self;
  [self.topBar.layer setValue:@(toCenterY) forKeyPath:animation.keyPath];
  [self.topBar.layer addAnimation:animation forKey:@"JDBounceAnimation"];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag;
{
  self.topBar.transform = CGAffineTransformIdentity;
  [self.topBar.layer removeAllAnimations];
}

#pragma mark Progress & Activity

- (void)setProgress:(CGFloat)progress;
{
  if (_topBar == nil) return;

  // trim progress
  _progress = MIN(1.0, MAX(0.0,progress));

  if (_progress == 0.0) {
    _progressView.frame = CGRectZero;
    return;
  }

  // update superview
  if (self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionBelow ||
      self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionNavBar) {
    [self.topBar.superview addSubview:self.progressView];
  } else {
    [self.topBar insertSubview:self.progressView belowSubview:self.topBar.textLabel];
  }

  // calculate progressView frame
  CGRect frame = self.topBar.bounds;
  CGFloat height = MIN(frame.size.height,MAX(0.5, self.activeStyle.progressBarHeight));
  if (height == 20.0 && frame.size.height > height) height = frame.size.height;
  frame.size.height = height;
  frame.size.width = round((frame.size.width - 2 * self.activeStyle.progressBarHorizontalInsets) * progress);
  frame.origin.x = self.activeStyle.progressBarHorizontalInsets;

  // apply y-position from active style
  CGFloat barHeight = self.topBar.bounds.size.height;
  if (self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionBottom) {
    frame.origin.y = barHeight - height;
  } else if(self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionCenter) {
    frame.origin.y = round((barHeight - height)/2.0);
  } else if(self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionTop) {
    frame.origin.y = 0.0;
  } else if(self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionBelow) {
    frame.origin.y = barHeight;
  } else if(self.activeStyle.progressBarPosition == JDStatusBarProgressBarPositionNavBar) {
    CGFloat navBarHeight = 44.0;
    if (([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) &&
        UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation])) {
      navBarHeight = 32.0;
    }
    frame.origin.y = barHeight + navBarHeight;
  }

  // apply color from active style
  self.progressView.backgroundColor = self.activeStyle.progressBarColor;

  // apply corner radius
  self.progressView.layer.cornerRadius = self.activeStyle.progressBarCornerRadius;

  // update progressView frame
  BOOL animated = !CGRectEqualToRect(self.progressView.frame, CGRectZero);
  [UIView animateWithDuration:animated ? 0.05 : 0.0 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
    self.progressView.frame = frame;
  } completion:nil];
}

- (void)showActivityIndicator:(BOOL)show
               indicatorStyle:(UIActivityIndicatorViewStyle)style;
{
  if (_topBar == nil) return;

  if (show) {
    [self.topBar.activityIndicatorView startAnimating];
    self.topBar.activityIndicatorView.activityIndicatorViewStyle = style;
  } else {
    [self.topBar.activityIndicatorView stopAnimating];
  }
}

#pragma mark State

- (BOOL)isVisible;
{
  return (_topBar != nil);
}

#pragma mark Lazy views

- (UIWindow *)overlayWindow;
{
  if(_overlayWindow == nil) {
    _overlayWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    _overlayWindow.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    _overlayWindow.backgroundColor = [UIColor clearColor];
    _overlayWindow.userInteractionEnabled = NO;
    _overlayWindow.windowLevel = UIWindowLevelStatusBar;
    _overlayWindow.rootViewController = [[JDStatusBarNotificationViewController alloc] init];
    _overlayWindow.rootViewController.view.backgroundColor = [UIColor clearColor];
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 70000 // only when deployment target is < ios7
    _overlayWindow.rootViewController.wantsFullScreenLayout = YES;
#endif
    [self updateWindowTransform];
    [self updateTopBarFrameWithStatusBarFrame:[[UIApplication sharedApplication] statusBarFrame]];
  }
  return _overlayWindow;
}

- (JDStatusBarView*)topBar;
{
  if(_topBar == nil) {
    _topBar = [[JDStatusBarView alloc] init];
    [self.overlayWindow.rootViewController.view addSubview:_topBar];

    JDStatusBarStyle *style = self.activeStyle ?: self.defaultStyle;
    if (style.animationType != JDStatusBarAnimationTypeFade) {
      self.topBar.transform = CGAffineTransformMakeTranslation(0, -self.topBar.frame.size.height);
    } else {
      self.topBar.alpha = 0.0;
    }
  }
  return _topBar;
}

- (UIView *)progressView;
{
  if (_progressView == nil) {
    _progressView = [[UIView alloc] initWithFrame:CGRectZero];
  }
  return _progressView;
}

#pragma mark Rotation

- (void)updateWindowTransform;
{
  UIWindow *window = [[UIApplication sharedApplication]
                      mainApplicationWindowIgnoringWindow:self.overlayWindow];
  _overlayWindow.transform = window.transform;
  _overlayWindow.frame = window.frame;
}

- (void)updateTopBarFrameWithStatusBarFrame:(CGRect)rect;
{
  CGFloat width = MAX(rect.size.width, rect.size.height);
  CGFloat height = MIN(rect.size.width, rect.size.height);
    
  // on ios7 fix position, if statusBar has double height
  CGFloat yPos = 0;
  if ([JDStatusBarView isIphoneX]) {
    height = 64;
  } else {
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0 && height > 20.0) {
      yPos = -height/2.0;
    }
  }
  _topBar.frame = CGRectMake(0, yPos, width, height);
}

- (void)willChangeStatusBarFrame:(NSNotification*)notification;
{
  CGRect newBarFrame = [notification.userInfo[UIApplicationStatusBarFrameUserInfoKey] CGRectValue];
  NSTimeInterval duration = [[UIApplication sharedApplication] statusBarOrientationAnimationDuration];

  // update window & statusbar
  void(^updateBlock)() = ^{
    [self updateWindowTransform];
    [self updateTopBarFrameWithStatusBarFrame:newBarFrame];
    self.progress = self.progress; // // relayout progress bar
  };

  [UIView animateWithDuration:duration animations:^{
    updateBlock();
  } completion:^(BOOL finished) {
    // this hack fixes a broken frame after the rotation (#35)
    // but rotation animation is still broken
    updateBlock();
  }];
}

@end

// A custom view controller, so the statusBarStyle & rotation behaviour is correct
@implementation JDStatusBarNotificationViewController

// rotation

- (UIViewController*)mainController
{
  UIWindow *mainAppWindow = [[UIApplication sharedApplication] mainApplicationWindowIgnoringWindow:self.view.window];
  UIViewController *topController = mainAppWindow.rootViewController;

  while(topController.presentedViewController) {
    topController = topController.presentedViewController;
  }

  return topController;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
  return [[self mainController] shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
}

- (BOOL)shouldAutorotate {
  return [[self mainController] shouldAutorotate];
}

#if __IPHONE_OS_VERSION_MAX_ALLOWED < 90000
- (NSUInteger)supportedInterfaceOrientations {
#else
  - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
#endif
    return [[self mainController] supportedInterfaceOrientations];
  }

  - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return [[self mainController] preferredInterfaceOrientationForPresentation];
  }

  // statusbar

  static BOOL JDUIViewControllerBasedStatusBarAppearanceEnabled() {
    static BOOL enabled = NO;
    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{
      enabled = [[[[NSBundle mainBundle] infoDictionary] objectForKey:@"UIViewControllerBasedStatusBarAppearance"] boolValue];
    });

    return enabled;
  }

  - (UIStatusBarStyle)preferredStatusBarStyle {
    if(JDUIViewControllerBasedStatusBarAppearanceEnabled()) {
      return [[self mainController] preferredStatusBarStyle];
    }

    return [[UIApplication sharedApplication] statusBarStyle];
  }

  - (BOOL)prefersStatusBarHidden {
    return NO;
  }

  - (UIStatusBarAnimation)preferredStatusBarUpdateAnimation {
    if(JDUIViewControllerBasedStatusBarAppearanceEnabled()) {
      return [[self mainController] preferredStatusBarUpdateAnimation];
    }
    return [super preferredStatusBarUpdateAnimation];
  }

  @end

  @implementation UIApplication (mainWindow)
  // we don't want the keyWindow, since it could be our own window
  - (UIWindow*)mainApplicationWindowIgnoringWindow:(UIWindow *)ignoringWindow {
    for (UIWindow *window in [[UIApplication sharedApplication] windows]) {
      if (!window.hidden && window != ignoringWindow) {
        return window;
      }
    }
    return nil;
  }
  @end