//
//  ASEnvironment.mm
//  AsyncDisplayKit
//
//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under the BSD-style license found in the
//  LICENSE file in the root directory of this source tree. An additional grant
//  of patent rights can be found in the PATENTS file in the same directory.
//

#import "ASEnvironmentInternal.h"
#import "ASAvailability.h"
#import "ASObjectDescriptionHelpers.h"

ASEnvironmentLayoutOptionsState ASEnvironmentLayoutOptionsStateMakeDefault()
{
  return (ASEnvironmentLayoutOptionsState) {
    // Default values can be defined in here
  };
}

ASEnvironmentHierarchyState ASEnvironmentHierarchyStateMakeDefault()
{
  return (ASEnvironmentHierarchyState) {
    // Default values can be defined in here
  };
}

ASEnvironmentTraitCollection ASEnvironmentTraitCollectionMakeDefault()
{
  return (ASEnvironmentTraitCollection) {
    // Default values can be defined in here
    .userInterfaceIdiom = UIUserInterfaceIdiomUnspecified,
    .containerSize = CGSizeZero,
  };
}

ASEnvironmentTraitCollection ASEnvironmentTraitCollectionFromUITraitCollection(UITraitCollection *traitCollection)
{
  ASEnvironmentTraitCollection environmentTraitCollection = ASEnvironmentTraitCollectionMakeDefault();
  if (AS_AT_LEAST_IOS8) {
    environmentTraitCollection.displayScale = traitCollection.displayScale;
    environmentTraitCollection.horizontalSizeClass = traitCollection.horizontalSizeClass;
    environmentTraitCollection.verticalSizeClass = traitCollection.verticalSizeClass;
    environmentTraitCollection.userInterfaceIdiom = traitCollection.userInterfaceIdiom;
    if (AS_AT_LEAST_IOS9) {
      environmentTraitCollection.forceTouchCapability = traitCollection.forceTouchCapability;
    }
  }
  return environmentTraitCollection;
}

BOOL ASEnvironmentTraitCollectionIsEqualToASEnvironmentTraitCollection(ASEnvironmentTraitCollection lhs, ASEnvironmentTraitCollection rhs)
{
  return
    lhs.verticalSizeClass == rhs.verticalSizeClass &&
    lhs.horizontalSizeClass == rhs.horizontalSizeClass &&
    lhs.displayScale == rhs.displayScale &&
    lhs.userInterfaceIdiom == rhs.userInterfaceIdiom &&
    lhs.forceTouchCapability == rhs.forceTouchCapability &&
    CGSizeEqualToSize(lhs.containerSize, rhs.containerSize);
}

// Named so as not to conflict with a hidden Apple function, in case compiler decides not to inline
ASDISPLAYNODE_INLINE NSString *AS_NSStringFromUIUserInterfaceIdiom(UIUserInterfaceIdiom idiom) {
  switch (idiom) {
    case UIUserInterfaceIdiomTV:
      return @"TV";
    case UIUserInterfaceIdiomPad:
      return @"Pad";
    case UIUserInterfaceIdiomPhone:
      return @"Phone";
    case UIUserInterfaceIdiomCarPlay:
      return @"CarPlay";
    default:
      return @"Unspecified";
  }
}

// Named so as not to conflict with a hidden Apple function, in case compiler decides not to inline
ASDISPLAYNODE_INLINE NSString *AS_NSStringFromUIForceTouchCapability(UIForceTouchCapability capability) {
  switch (capability) {
    case UIForceTouchCapabilityAvailable:
      return @"Available";
    case UIForceTouchCapabilityUnavailable:
      return @"Unavailable";
    default:
      return @"Unknown";
  }
}

// Named so as not to conflict with a hidden Apple function, in case compiler decides not to inline
ASDISPLAYNODE_INLINE NSString *AS_NSStringFromUIUserInterfaceSizeClass(UIUserInterfaceSizeClass sizeClass) {
  switch (sizeClass) {
    case UIUserInterfaceSizeClassCompact:
      return @"Compact";
    case UIUserInterfaceSizeClassRegular:
      return @"Regular";
    default:
      return @"Unspecified";
  }
}

NSString *NSStringFromASEnvironmentTraitCollection(ASEnvironmentTraitCollection traits)
{
  NSMutableArray<NSDictionary *> *props = [NSMutableArray array];
  [props addObject:@{ @"userInterfaceIdiom": AS_NSStringFromUIUserInterfaceIdiom(traits.userInterfaceIdiom) }];
  [props addObject:@{ @"containerSize": NSStringFromCGSize(traits.containerSize) }];
  [props addObject:@{ @"horizontalSizeClass": AS_NSStringFromUIUserInterfaceSizeClass(traits.horizontalSizeClass) }];
  [props addObject:@{ @"verticalSizeClass": AS_NSStringFromUIUserInterfaceSizeClass(traits.verticalSizeClass) }];
  [props addObject:@{ @"forceTouchCapability": AS_NSStringFromUIForceTouchCapability(traits.forceTouchCapability) }];
  return ASObjectDescriptionMakeWithoutObject(props);
}

ASEnvironmentState ASEnvironmentStateMakeDefault()
{
  return (ASEnvironmentState) {
    .layoutOptionsState = ASEnvironmentLayoutOptionsStateMakeDefault(),
    .hierarchyState = ASEnvironmentHierarchyStateMakeDefault(),
    .environmentTraitCollection = ASEnvironmentTraitCollectionMakeDefault()
  };
}