//
// Copyright 2010-2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License").
// You may not use this file except in compliance with the License.
// A copy of the License is located at
//
// http://aws.amazon.com/apache2.0
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "AWSUIConfiguration.h"

NS_ASSUME_NONNULL_BEGIN

@interface AWSAuthUIHelper : NSObject

/**
 Set up shadow around specified view
 
 @param view The view for which form shadow is to be set
 **/
+ (void) setUpFormShadowForView:(UIView *)view;

/**
 Get background color set in the config or return the default background color.
 This is resilient to light/dark mode setting on iOS 13 (`UIColor.systemBackgroundColor`).
 
 @param config The object conforming to `AWSUIConfiguration` protocol
 @return backgroundColor
 **/
+ (UIColor *) getBackgroundColor:(id<AWSUIConfiguration>)config;

/**
 Get the default secondary background color. This is resilient to
 light/dark mode setting on iOS 13 (`UIColor.secondarySystemBackgroundColor`).
 */
+ (UIColor *) getSecondaryBackgroundColor;

/**
 Apply button-like primary color to buttons and labels.
 
 @param config The object conforming to `AWSUIConfiguration` protocol
 @param view The view (usually a `UIButton` or `UILabel`)
 @param background whether the color should be applied to the background of
 the component or to the foreground. This is useful when styling buttons
 that look like hyperlinks.
 */
+ (void) applyPrimaryColorFromConfig:(id<AWSUIConfiguration>)config
                              toView:(UIView *) view
                          background:(BOOL) background;

/**
 Apply primary color to the view's background.
 
 @see applyPrimaryColorFromConfig:(id<AWSUIConfiguration>) toView:(UIView *) background:(BOOL)
 */
+ (void) applyPrimaryColorFromConfig:(id<AWSUIConfiguration>)config
                              toView:(UIView *) view;

/**
 Retrieve the font set in the config or return nil
 
 @param config The object conforming to `AWSUIConfiguration` protocol
 @return font
 **/
+ (UIFont *) getFont:(id<AWSUIConfiguration>)config;

/**
 Retrieve the flag that says if the background color has to be applied full screen or not.
 
 @param config The object conforming to `AWSUIConfiguration` protocol
 @return isFullScreenBackgroundColorEnabled
 **/
+ (BOOL) isBackgroundColorFullScreen:(id<AWSUIConfiguration>)config;


/**
 Get the primary text color. Based on the configured background color.
 
 On iOS 13 or greater is uses `UIColor.labelColor` so it auto-adapts to
 light/dark mode. On older systems is picks a light or a dark color to
 contrast with the main background color.
 
 @param config The object conforming to `AWSUIConfiguration` protocol
 @return a text color that contrasts with the background color.
 */
+ (UIColor *) getTextColor:(id<AWSUIConfiguration>)config;

/**
 Set the AWSAuthUIConfiguration object.
 
 @param config The config object from which backgroundColor,
               isFullScreenBackgroundColorEnabled and font are extracted.
 **/
+ (void) setAWSUIConfiguration:(id<AWSUIConfiguration>)config;

/**
 Retrieve the AWSAuthUIConfiguration object.
 
 @return AWSAuthUIConfiguration
 **/
+ (id<AWSUIConfiguration>) getAWSUIConfiguration;

@end

NS_ASSUME_NONNULL_END