// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
//
// You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
// copy, modify, and distribute this software in source code or binary form for use
// in connection with the web services and APIs provided by Facebook.
//
// As with any software that integrates with the Facebook platform, your use of
// this software is subject to the Facebook Developer Principles and Policies
// [http://developers.facebook.com/policy/]. This copyright notice shall be
// included in all copies or substantial portions of the software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#import "FBSDKTypeUtility.h"

#import "FBSDKMacros.h"

@implementation FBSDKTypeUtility

#pragma mark - Class Methods

+ (NSArray *)arrayValue:(id)object
{
  return (NSArray *)[self _objectValue:object ofClass:[NSArray class]];
}

+ (BOOL)boolValue:(id)object
{
  if ([object isKindOfClass:[NSNumber class]]) {
    // @0 or @NO returns NO, otherwise YES
    return [(NSNumber *)object boolValue];
  } else if ([object isKindOfClass:[NSString class]]) {
    // Returns YES on encountering one of "Y", "y", "T", "t", or a digit 1-9, otherwise NO
    return [(NSString *)object boolValue];
  } else {
    return ([self objectValue:object] != nil);
  }
}

+ (NSDictionary *)dictionaryValue:(id)object
{
  return (NSDictionary *)[self _objectValue:object ofClass:[NSDictionary class]];
}

+ (NSInteger)integerValue:(id)object
{
  if ([object isKindOfClass:[NSNumber class]]) {
    return [(NSNumber *)object integerValue];
  } else if ([object isKindOfClass:[NSString class]]) {
    return [(NSString *)object integerValue];
  } else {
    return 0;
  }
}

+ (id)objectValue:(id)object
{
  return ([object isKindOfClass:[NSNull class]] ? nil : object);
}

+ (NSString *)stringValue:(id)object
{
  if ([object isKindOfClass:[NSString class]]) {
    return (NSString *)object;
  } else if ([object isKindOfClass:[NSNumber class]]) {
    return [(NSNumber *)object stringValue];
  } else if ([object isKindOfClass:[NSURL class]]) {
    return [(NSURL *)object absoluteString];
  } else {
    return nil;
  }
}

+ (NSUInteger)unsignedIntegerValue:(id)object
{
  if ([object isKindOfClass:[NSNumber class]]) {
    return [(NSNumber *)object unsignedIntegerValue];
  } else {
    // there is no direct support for strings containing unsigned values > NSIntegerMax - not worth writing ourselves
    // right now, so just cap unsigned values at NSIntegerMax until we have a need for larger
    NSInteger integerValue = [self integerValue:object];
    if (integerValue < 0) {
      integerValue = 0;
    }
    return (NSUInteger)integerValue;
  }
}

+ (NSURL *)URLValue:(id)object
{
  if ([object isKindOfClass:[NSURL class]]) {
    return (NSURL *)object;
  } else if ([object isKindOfClass:[NSString class]]) {
    return [[NSURL alloc] initWithString:(NSString *)object];
  } else {
    return nil;
  }
}

#pragma mark - Object Lifecycle

- (instancetype)init
{
  FBSDK_NO_DESIGNATED_INITIALIZER();
  return nil;
}

#pragma mark - Helper Methods

+ (id)_objectValue:(id)object ofClass:(Class)expectedClass
{
  return ([object isKindOfClass:expectedClass] ? object : nil);
}

@end
