//
//  StackableViewController.m
//  myverizon
//
//  Created by Scott Pfeil on 3/26/14.
//  Copyright (c) 2014 Verizon Wireless. All rights reserved.
//

#import "StackableViewController.h"
#import "MFStyler.h"
#import "ViewConstrainingView.h"

@interface StackableViewController ()

@end

@implementation StackableViewController

- (void)newDataBuildScreen {
    [super newDataBuildScreen];
    
    // Removes all the subviews so they can be updated again.
    [self removeUIViews];
}

- (void)generateFormViewWithUIArray:(nullable NSArray <UIView *>*)formUIArray {
    
    self.formUIArray = formUIArray;
    [StackableViewController populateView:self.contentView withUIArray:formUIArray withSpacingBlock:^UIEdgeInsets(id  _Nullable object) {
        return [self spaceAroundUIObject:object];
    }];
}
    
- (void)generateFormView:(nullable UIView *)view withUIArrayForConstrainingViews:(nullable NSArray <UIView *>*)formUIArray {
    self.formUIArray = formUIArray;
    [StackableViewController populateView:view withUIArrayForConstrainingViews:formUIArray withSpacingBlock:^UIEdgeInsets(id  _Nullable object) {
        return [self spaceAroundUIObject:object];
    }];
}

- (UIEdgeInsets)spaceAroundUIObject:(nullable id)object {
    
    UIEdgeInsets insets = [StackableViewController standardSpaceAroundUIObject];
    if (object == [self.formUIArray lastObject]) {
        
        // The last object should have space from the bottom
        insets.bottom = [MFStyler defaultVerticalPaddingForApplicationWidth];
    }
    return insets;
}

- (void)removeUIViews {
    [StackableViewController removeUIViews:self.formUIArray];
}

+ (void)removeUIViews:(nullable NSArray <UIView *>*)views {
    for (NSUInteger i = 0; i < [views count]; i++) {
        UIView *view = [views objectAtIndex:i];
        [view removeFromSuperview];
    }
}

+ (void)populateView:(nonnull UIView *)view withUIArray:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {
    
    if ([formUIArray count] > 0) {
        
        for (UIView *subview in formUIArray) {
            [view addSubview:subview];
        }
    
        [StackableViewController autoLayoutView:view withUIArray:formUIArray withSpacingBlock:spacingBlock];
    }
}

+ (void)populateViewHorizontally:(nonnull UIView *)view withUIArray:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {

    if ([formUIArray count] > 0) {
        
        for (UIView *subview in formUIArray) {
            [view addSubview:subview];
        }
        
        [StackableViewController autoLayoutViewHorizontally:view withUIArray:formUIArray withSpacingBlock:spacingBlock];
    }
}
    
+ (void)populateView:(nonnull UIView *)view withUIArrayForConstrainingViews:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {
    
    if ([formUIArray count] > 0) {
        
        for (UIView *subview in formUIArray) {
            ViewConstrainingView *constrainingView = [ViewConstrainingView viewConstrainingView:subview];
            [view addSubview:constrainingView];
        }
        
        [StackableViewController autoLayoutViewWithConstrainingViewsWithUIArray:formUIArray withSpacingBlock:spacingBlock];
    }
}

+ (void)autoLayoutView:(nonnull UIView *)view withUIArray:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {
    
    if ([formUIArray count] > 0) {
        
        // Adds the first object to the view and pins it to the top of the content view.
        id previousUIObject = [formUIArray objectAtIndex:0];
        UIEdgeInsets spaceAroundObjectPrevious = spacingBlock(previousUIObject);
        [previousUIObject setTranslatesAutoresizingMaskIntoConstraints:NO];
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-top@999-[previousUIObject]" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"top":@(spaceAroundObjectPrevious.top)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left@999-[previousUIObject]-right-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"left":@(spaceAroundObjectPrevious.left),@"right":@(spaceAroundObjectPrevious.right)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
        
        // Sets the horizontal spacing and adds vertical spacing between all ui objects.
        for (NSUInteger i = 1; i < [formUIArray count]; i++) {
            
            id uiObject = [formUIArray objectAtIndex:i];
            UIEdgeInsets spaceAroundObjectCurrent = spacingBlock(uiObject);
            [uiObject setTranslatesAutoresizingMaskIntoConstraints:NO];
            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[previousUIObject]-space-[uiObject]" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"space":@(spaceAroundObjectPrevious.bottom + spaceAroundObjectCurrent.top)} views:NSDictionaryOfVariableBindings(previousUIObject,uiObject)]];
            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left@999-[uiObject]-right-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"left":@(spaceAroundObjectCurrent.left),@"right":@(spaceAroundObjectCurrent.right)} views:NSDictionaryOfVariableBindings(uiObject)]];
            
            previousUIObject = uiObject;
            spaceAroundObjectPrevious = spaceAroundObjectCurrent;
        }
        
        // Pins the last object to the bottom of the content view.
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[previousUIObject]-bottom-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"bottom":@(spaceAroundObjectPrevious.bottom)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
    }
}

+ (void)autoLayoutViewHorizontally:(nonnull UIView *)view withUIArray:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {
    
    if ([formUIArray count] > 0) {
        
        // Adds the first object to the view and pins it to the top and left of the content view.
        id previousUIObject = [formUIArray objectAtIndex:0];
        UIEdgeInsets spaceAroundObjectPrevious = spacingBlock(previousUIObject);
        [previousUIObject setTranslatesAutoresizingMaskIntoConstraints:NO];
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-top@999-[previousUIObject]-bottom-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"top":@(spaceAroundObjectPrevious.top),@"bottom":@(spaceAroundObjectPrevious.bottom)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-left@999-[previousUIObject]" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"left":@(spaceAroundObjectPrevious.left)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
        
        // Sets the vertical spacing and adds horizontal spacing between all ui objects.
        for (NSUInteger i = 1; i < [formUIArray count]; i++) {
            
            id uiObject = [formUIArray objectAtIndex:i];
            UIEdgeInsets spaceAroundObjectCurrent = spacingBlock(uiObject);
            [uiObject setTranslatesAutoresizingMaskIntoConstraints:NO];
            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previousUIObject]-space-[uiObject]" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"space":@(spaceAroundObjectPrevious.right + spaceAroundObjectCurrent.left)} views:NSDictionaryOfVariableBindings(previousUIObject,uiObject)]];
            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-top@999-[uiObject]-bottom-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"top":@(spaceAroundObjectCurrent.top),@"bottom":@(spaceAroundObjectCurrent.bottom)} views:NSDictionaryOfVariableBindings(uiObject)]];
            
            previousUIObject = uiObject;
            spaceAroundObjectPrevious = spaceAroundObjectCurrent;
        }
        
        // Pins the last object to the right of the content view.
        [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previousUIObject]-right-|" options:NSLayoutFormatDirectionLeadingToTrailing metrics:@{@"right":@(spaceAroundObjectPrevious.right)} views:NSDictionaryOfVariableBindings(previousUIObject)]];
    }
}
    
+ (void)autoLayoutViewWithConstrainingViewsWithUIArray:(nonnull NSArray <UIView *>*)formUIArray withSpacingBlock:(nonnull UIEdgeInsets (^) (id _Nullable object))spacingBlock {
    if ([formUIArray count] > 0) {
        
        // Adds the first object to the view and pins it to the top of the content view.
        UIView *uiObject = [formUIArray objectAtIndex:0];
        ViewConstrainingView *previousConstrainingView = (ViewConstrainingView *)uiObject.superview;
        [previousConstrainingView.topAnchor constraintEqualToAnchor:previousConstrainingView.superview.topAnchor].active = YES;
        [previousConstrainingView.leftAnchor constraintEqualToAnchor:previousConstrainingView.superview.leftAnchor].active = YES;
        [previousConstrainingView.superview.rightAnchor constraintEqualToAnchor:previousConstrainingView.rightAnchor].active = YES;
        
        UIEdgeInsets spaceAroundObject = spacingBlock(uiObject);
        [previousConstrainingView setPinConstantsWithInsets:spaceAroundObject];
        
        // Sets the horizontal spacing and adds vertical spacing between all ui objects.
        for (NSUInteger i = 1; i < [formUIArray count]; i++) {
            
            uiObject = [formUIArray objectAtIndex:i];
            ViewConstrainingView *constrainingView = (ViewConstrainingView *)uiObject.superview;
            [constrainingView.topAnchor constraintEqualToAnchor:previousConstrainingView.bottomAnchor].active = YES;
            [constrainingView.leftAnchor constraintEqualToAnchor:constrainingView.superview.leftAnchor].active = YES;
            [constrainingView.superview.rightAnchor constraintEqualToAnchor:constrainingView.rightAnchor].active = YES;
            
            spaceAroundObject = spacingBlock(uiObject);
            [constrainingView setPinConstantsWithInsets:spaceAroundObject];
            
            previousConstrainingView = constrainingView;
        }
        
        // Pins the last object to the bottom of the content view.
        [previousConstrainingView.superview.bottomAnchor constraintEqualToAnchor:previousConstrainingView.bottomAnchor].active = YES;
    }
}

- (void)resetSpaceForFormArrayWithConstrainingViews {
    for (UIView *view in self.formUIArray) {
        ViewConstrainingView *constrainingView = (ViewConstrainingView *)view.superview;
        [constrainingView setPinConstantsWithInsets:[self spaceAroundUIObject:view]];
    }
}

+ (UIEdgeInsets)standardSpaceAroundUIObject {
    CGFloat horizontal = [MFStyler defaultHorizontalPaddingForApplicationWidth];
    CGFloat vertical = [MFStyler defaultVerticalPaddingForApplicationWidth];
    return UIEdgeInsetsMake(vertical, horizontal, 0, horizontal);
}

@end