//
//  BubbleView.m
//  XenonSDK
//
//  Created by SAGESSE on 2019/5/30.
//  Copyright © 2019 SAGESSE. All rights reserved.
//

#import "BubbleView.h"
#import "XenonSDK.h"

@interface BubbleView () <UIGestureRecognizerDelegate>


@property (nonatomic, strong) NSTimer* timer;
@property (nonatomic, strong) UIPanGestureRecognizer* panGestureRecognizer;


@end

@implementation BubbleView


- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    
    self.contentView = [UIButton buttonWithType:UIButtonTypeSystem];
    
    UIImage* image = [UIImage imageNamed:@"login_mine" inBundle:XenonSDK.sharedSDK.bundle compatibleWithTraitCollection:nil];
    
    
    self.contentView.frame = self.bounds;
    self.contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.contentView setImage:[image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                      forState:UIControlStateNormal];
    [self addSubview:self.contentView];
    
    return self;
}

- (void)startCountdonw {
    // Setting timer.
    NSTimer* timer = [NSTimer timerWithTimeInterval:3 target:self selector:@selector(echo:) userInfo:nil repeats:false];
    [NSRunLoop.mainRunLoop addTimer:timer forMode:NSDefaultRunLoopMode];
    self.timer = timer;
}
- (void)stopCountdown {
    if (self.timer == nil) {
        return;
    }
    
    [self.timer invalidate];
    self.timer = nil;
    
    // Restore cursor state.
    self.transform = CGAffineTransformIdentity;

    self.contentView.hidden = NO;
    self.gradualView.hidden = YES;
}

- (CGPoint)estimateRange:(CGPoint)center inView:(UIView*)view {
    if (view == nil) {
        return center;
    }
    
    CGRect bounds = UIEdgeInsetsInsetRect(view.bounds, UIEdgeInsetsMake(8, 8, 8, 8));;
    
    CGFloat x = center.x;
    CGFloat y = center.y;
    
    // Check that the distance side is closer.
    if (fabs((x - self.frame.size.width / 2) - CGRectGetMinX(bounds)) < fabs((x + self.frame.size.width / 2) - CGRectGetMaxX(bounds))) {
        x = CGRectGetMinX(bounds) + self.frame.size.width / 2;
    } else {
        x = CGRectGetMaxX(bounds) - self.frame.size.width / 2;

    }
    
    // You can't go above or below the boundary.
    y = fmin(fmax(y, CGRectGetMinY(bounds) + self.frame.size.height / 2), CGRectGetMaxY(bounds) - self.frame.size.height / 2);
    return CGPointMake(x, y);
}

- (void)echo:(NSTimer*)timer {

    // Gets the window.
    if (self.window == nil) {
        return;
    }
    
    // Only need to create the view once.
    if (self.gradualView == nil) {
        
        // If no image is provided, ignore it.
        UIImage* image = [UIImage imageNamed:@"login_iv_hide" inBundle:XenonSDK.sharedSDK.bundle compatibleWithTraitCollection:nil];
        if (image == nil) {
            return;
        }

        // Calculate the best display effect.
        CGFloat height = self.bounds.size.height;
        CGFloat width = height * (image.size.width / image.size.height);
        
        // Create the view and set the same default values.
        
        UIImageView* imageView = [[UIImageView alloc] initWithImage:image];
        
        imageView.bounds = CGRectMake(0, 0, width, height);
        
        imageView.hidden = NO;
        imageView.userInteractionEnabled = NO;
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
        [self addSubview:imageView];
        self.gradualView = imageView;
    }

    // Click is not allowed while hidden.
    self.contentView.hidden = false;
    self.gradualView.hidden = true;

    // Calculate the distance to the boundary.
    CGFloat offset = 0;
    if (fabs(CGRectGetMinX(self.frame)) < fabs(self.window.frame.size.width - CGRectGetMaxX(self.frame))) {
        // In left side.
        offset = -CGRectGetMaxX(self.frame);

        self.gradualView.transform = CGAffineTransformIdentity;
        self.gradualView.frame = CGRectMake(-CGRectGetMinX(self.frame), 0, self.gradualView.frame.size.width, self.gradualView.frame.size.height);
        
    } else {
        // In right side.
        offset = self.window.frame.size.width - CGRectGetMinX(self.frame);
        self.gradualView.transform = CGAffineTransformMakeScale(-1, 1);
        self.gradualView.frame = CGRectMake(offset - self.gradualView.frame.size.width, 0, self.gradualView.frame.size.width, self.gradualView.frame.size.height);
    }

    // Generate hidden animation.
    [UIView animateWithDuration:0.2 animations:^{
        
        // step 1: hide the entire button.
        self.transform = CGAffineTransformMakeTranslation(offset, 0);

    } completion:^(BOOL finished) {
        
        // step 2: Disable click events to show hidden cursors.
        self.contentView.hidden = true;
        self.gradualView.hidden = false;
        
        // step 3: Generate display animation.
        [UIView animateWithDuration:0.15 animations:^{
            self.transform = CGAffineTransformIdentity;
        }];
    }];
    
    [timer invalidate];
}

- (void)move:(UIPanGestureRecognizer*)sender {
    
    CGPoint location = [sender translationInView:self.superview];
    switch (sender.state) {
        case UIGestureRecognizerStateBegan:
        case UIGestureRecognizerStateChanged:
        case UIGestureRecognizerStatePossible: {
            // Begin drag event.
            self.transform = CGAffineTransformMakeTranslation(location.x, location.y);
            [self stopCountdown];
            break;
        }
        case UIGestureRecognizerStateEnded: {
            // End drag event.
            self.transform = CGAffineTransformIdentity;
            self.center = CGPointMake(self.center.x + location.x, self.center.y + location.y);
            [self startCountdonw];
            
            // Generate move animation.
            [UIView animateWithDuration:0.25 animations:^{
                self.center = [self estimateRange:self.center inView:self.superview];
            }];

            // Getting the class name directly is to reduce the number of strings in the code.
            [XSDataCenter setValue:@[@(self.center.x), @(self.center.y)] forKey:NSStringFromClass(self.class)];
            break;
        }
        default: {
            // End drag event in cancel.
            self.transform = CGAffineTransformIdentity;
            [self startCountdonw];
            break;
        }
    }
}

- (void)setHidden:(BOOL)hidden {
    [super setHidden:hidden];
    
    if (self.timer == nil || !self.gradualView.hidden) {
        return;
    }
    
    // If you are hiding, countdown is not allowed.
    if (hidden) {
        // Cancel countdown.
        [self.timer invalidate];
    } else {
        // Restore countdown.
        [self startCountdonw];
    }
    
}

- (void)setCenter:(CGPoint)center {
    [super setCenter:center];
    
    if (self.superview == nil) {
        return;
    }
    
    if (CGRectGetMinX(self.frame) < CGRectGetWidth(self.superview.bounds) / 2) {
        // In left side.
        self.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;

    } else {
        // In right side.
        self.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;

    }
}

- (void)willMoveToSuperview:(UIView *)newSuperview {
    
    // Remove or Add?
    if (newSuperview == nil) {
        // When superview remove, the pan gesture recognizer need remove.
        [self.panGestureRecognizer.view removeGestureRecognizer:self.panGestureRecognizer];
        self.panGestureRecognizer = nil;
        [self stopCountdown];
        return;
    }
    if (self.panGestureRecognizer != nil) {
        return ;
    }
    
    CGPoint center = CGPointMake(newSuperview.bounds.size.width, newSuperview.bounds.size.height / 2);

    // Getting the class name directly is to reduce the number of strings in the code.
    NSArray* data = [XSDataCenter valueForKey:NSStringFromClass(self.class)];
    if (data.count == 2) {
        center.x = [data[0] doubleValue];
        center.y = [data[1] doubleValue];
    }
    
    UIPanGestureRecognizer* panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    
    panGestureRecognizer.delegate = self;
    panGestureRecognizer.delaysTouchesBegan = false;
    panGestureRecognizer.delaysTouchesEnded = true;
    panGestureRecognizer.cancelsTouchesInView = true;
    [newSuperview addGestureRecognizer:panGestureRecognizer];

    self.center = [self estimateRange:center inView:newSuperview];
    self.panGestureRecognizer = panGestureRecognizer;
    [self startCountdonw];
}

- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    
    if (self.hidden || !self.userInteractionEnabled) {
        return nil;
    }
    
    if (CGRectContainsPoint(self.contentView.frame, point) && !self.contentView.hidden) {
        return self.contentView;
    }
        
    if (self.gradualView != nil && CGRectContainsPoint(self.gradualView.frame, point) && !self.gradualView.hidden) {
        return self.gradualView;
    }

    return nil;
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if (self.hidden) {
        return NO;
    }
    CGRect bounds = UIEdgeInsetsInsetRect(self.bounds, UIEdgeInsetsMake(-20, -20, -20, -20));
    return CGRectContainsPoint(bounds, [gestureRecognizer locationInView:self]);
}

@end