/*
 Copyright 2018-present the Material Components for iOS authors. 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.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License 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 "MaterialTextFields.h"

@interface TextFieldCustomFontExample : UIViewController <UITextFieldDelegate, UITextViewDelegate>

@property(nonatomic) MDCTextInputControllerOutlined *systemFontController;
@property(nonatomic) MDCTextInputControllerOutlined *systemFontDynamicController;
@property(nonatomic) MDCTextInputControllerOutlined *customFontController;
@property(nonatomic) MDCTextInputControllerOutlined *customFontDynamicController;

@property(nonatomic) MDCTextInputControllerOutlinedTextArea *multilineController;
@property(nonatomic) MDCTextInputControllerOutlinedTextArea *multilineDynamicController;
@property(nonatomic) MDCTextInputControllerOutlinedTextArea *multilineCustomFontDynamicController;

@property(nonatomic) UIFont *normalTextFont;

@property(nonatomic) UIScrollView *scrollView;

@end

@implementation TextFieldCustomFontExample

- (void)dealloc {
  [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor whiteColor];

  [self registerKeyboardNotifications];

  [self setupScrollView];

  // Create a System Font TextField.
  MDCTextField *systemFontTextField = [self setupSystemFontTextField];

  // Create a System Font Dynamic TextField.
  MDCTextField *systemFontDynamicTextField = [self setupSystemFontDynamicTextField];

  // Create a Custom Font TextField.
  MDCTextField *customFontTextField = [self setupCustomFontTextField];;

  // Create a Custom Font Dynamic TextField.
  MDCTextField *customFontDynamicTextField = [self setupCustomFontDynamicTextField];;

  // Create a System Multiline TextField.
  MDCMultilineTextField *multilineTextField = [self setupSystemMultilineTextField];

  // Create a System Multiline Dynamic TextField.
  MDCMultilineTextField *multilineDynamicTextField = [self setupSystemMultilineDynamicTextField];

  // Create a Custom Multiline Dyamic TextField.
  MDCMultilineTextField *multilineCustomDynamicTextField =
      [self setupCustomMultilineDynamicTextField];


  NSDictionary *views = @{
                          @"t1" : systemFontTextField,
                          @"t2" : systemFontDynamicTextField,
                          @"t3" : customFontTextField,
                          @"t4" : customFontDynamicTextField,
                          @"t5" : multilineTextField,
                          @"t6" : multilineDynamicTextField,
                          @"t7" : multilineCustomDynamicTextField
                          };
  NSMutableArray<NSLayoutConstraint *> *constraints = [NSMutableArray
                                                       arrayWithArray:
                                                       [NSLayoutConstraint
                                                        constraintsWithVisualFormat:@"V:[t1]-[t2]-[t3]-[t4]-[t5]-[t6]-[t7]"

                                                        options:NSLayoutFormatAlignAllLeading |
                                                        NSLayoutFormatAlignAllTrailing
                                                        metrics:nil
                                                        views:views]];
  [constraints addObject:[NSLayoutConstraint constraintWithItem:systemFontTextField
                                                      attribute:NSLayoutAttributeLeading
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:self.view
                                                      attribute:NSLayoutAttributeLeadingMargin
                                                     multiplier:1
                                                       constant:0]];
  [constraints addObject:[NSLayoutConstraint constraintWithItem:systemFontTextField
                                                      attribute:NSLayoutAttributeTrailing
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:self.view
                                                      attribute:NSLayoutAttributeTrailingMargin
                                                     multiplier:1
                                                       constant:0]];
#if defined(__IPHONE_11_0) && (__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_11_0)
  if (@available(iOS 11.0, *)) {
    [NSLayoutConstraint activateConstraints:@[
                                              [NSLayoutConstraint constraintWithItem:systemFontTextField
                                                                           attribute:NSLayoutAttributeTop
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:self.scrollView.contentLayoutGuide
                                                                           attribute:NSLayoutAttributeTop
                                                                          multiplier:1
                                                                            constant:20],
                                              [NSLayoutConstraint constraintWithItem:multilineCustomDynamicTextField
                                                                           attribute:NSLayoutAttributeBottom
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:self.scrollView.contentLayoutGuide
                                                                           attribute:NSLayoutAttributeBottomMargin
                                                                          multiplier:1
                                                                            constant:-20]
                                              ]];
  } else {
    [NSLayoutConstraint activateConstraints:@[
                                              [NSLayoutConstraint constraintWithItem:systemFontTextField
                                                                           attribute:NSLayoutAttributeTop
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:self.scrollView
                                                                           attribute:NSLayoutAttributeTop
                                                                          multiplier:1
                                                                            constant:20],
                                              [NSLayoutConstraint constraintWithItem:multilineCustomDynamicTextField
                                                                           attribute:NSLayoutAttributeBottom
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:self.scrollView
                                                                           attribute:NSLayoutAttributeBottomMargin
                                                                          multiplier:1
                                                                            constant:-20]
                                              ]];
  }
#else
  [NSLayoutConstraint activateConstraints:@[
                                            [NSLayoutConstraint constraintWithItem:systemFontTextField
                                                                         attribute:NSLayoutAttributeTop
                                                                         relatedBy:NSLayoutRelationEqual
                                                                            toItem:self.scrollView
                                                                         attribute:NSLayoutAttributeTop
                                                                        multiplier:1
                                                                          constant:20],
                                            [NSLayoutConstraint constraintWithItem:systemFontTextField
                                                                         attribute:NSLayoutAttributeBottom
                                                                         relatedBy:NSLayoutRelationEqual
                                                                            toItem:self.scrollView
                                                                         attribute:NSLayoutAttributeBottomMargin
                                                                        multiplier:1
                                                                          constant:-20]
                                            ]];
#endif

  [NSLayoutConstraint activateConstraints:constraints];
}

- (void)setupScrollView {
  self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectZero];
  self.scrollView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:self.scrollView];
  NSArray *constraints =
      [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|"
                                              options:0
                                              metrics:nil
                                                views:@{@"scrollView" : self.scrollView}];

  [NSLayoutConstraint activateConstraints:constraints];
  constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|"
                                                        options:0
                                                        metrics:nil
                                                          views:@{@"scrollView" : self.scrollView}];
  [NSLayoutConstraint activateConstraints:constraints];
  UIEdgeInsets margins = UIEdgeInsetsMake(0, 16, 0, 16);
  self.scrollView.layoutMargins = margins;

  UITapGestureRecognizer *tapGestureRecognizer =
      [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDidTouch:)];
  [self.scrollView addGestureRecognizer:tapGestureRecognizer];
}

- (MDCTextField *)setupSystemFontTextField {
  MDCTextField *systemFontTextField = [[MDCTextField alloc] init];
  self.normalTextFont = systemFontTextField.font;
  systemFontTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:systemFontTextField];

  systemFontTextField.delegate = self;
  systemFontTextField.clearButtonMode = UITextFieldViewModeUnlessEditing;
  systemFontTextField.backgroundColor = [UIColor whiteColor];

  self.systemFontController = [[MDCTextInputControllerOutlined alloc] initWithTextInput:systemFontTextField];
  self.systemFontController.placeholderText = @"System Font";
  self.systemFontController.mdc_adjustsFontForContentSizeCategory = NO;
  return systemFontTextField;
}

- (MDCTextField *)setupSystemFontDynamicTextField {
  MDCTextField *systemFontDynamicTextField = [[MDCTextField alloc] init];
  systemFontDynamicTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:systemFontDynamicTextField];

  systemFontDynamicTextField.delegate = self;
  systemFontDynamicTextField.clearButtonMode = UITextFieldViewModeUnlessEditing;
  systemFontDynamicTextField.backgroundColor = [UIColor whiteColor];

  self.systemFontDynamicController =
      [[MDCTextInputControllerOutlined alloc] initWithTextInput:systemFontDynamicTextField];
  self.systemFontDynamicController.placeholderText = @"System Font - Dynamic";
  self.systemFontDynamicController.mdc_adjustsFontForContentSizeCategory = YES;
  return systemFontDynamicTextField;
}

- (MDCTextField *)setupCustomFontTextField {
  MDCTextField *customFontTextField = [[MDCTextField alloc] init];
  customFontTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:customFontTextField];

  customFontTextField.delegate = self;
  customFontTextField.clearButtonMode = UITextFieldViewModeUnlessEditing;
  customFontTextField.backgroundColor = [UIColor whiteColor];

  self.customFontController =
      [[MDCTextInputControllerOutlined alloc] initWithTextInput:customFontTextField];
  self.customFontController.placeholderText = @"Custom Font";
  self.customFontController.mdc_adjustsFontForContentSizeCategory = NO;
  self.customFontController.leadingUnderlineLabelFont =
      [UIFont fontWithName:@"AmericanTypewriter" size:12];
  self.customFontController.trailingUnderlineLabelFont =
      [UIFont fontWithName:@"Chalkduster" size:12];
  self.customFontController.inlinePlaceholderFont =
      [UIFont fontWithName:@"AmericanTypewriter" size:12];
  self.customFontController.textInputFont = [UIFont fontWithName:@"Chalkduster" size:16];
  return customFontTextField;
}

- (MDCTextField *)setupCustomFontDynamicTextField {
  MDCTextField *customFontDynamicTextField = [[MDCTextField alloc] init];
  customFontDynamicTextField.translatesAutoresizingMaskIntoConstraints = NO;

  customFontDynamicTextField.delegate = self;
  customFontDynamicTextField.clearButtonMode = UITextFieldViewModeUnlessEditing;
  customFontDynamicTextField.backgroundColor = [UIColor whiteColor];

  self.customFontDynamicController =
      [[MDCTextInputControllerOutlined alloc] initWithTextInput:customFontDynamicTextField];
  self.customFontDynamicController.placeholderText = @"Custom Font - Dynamic";
  self.customFontDynamicController.helperText = @"Helper";
  self.customFontDynamicController.leadingUnderlineLabelFont =
      [UIFont fontWithName:@"Zapfino" size:12];
  self.customFontDynamicController.trailingUnderlineLabelFont =
      [UIFont fontWithName:@"Chalkduster" size:12];
  self.customFontDynamicController.inlinePlaceholderFont = [UIFont fontWithName:@"Zapfino" size:12];
  self.customFontDynamicController.textInputFont = [UIFont fontWithName:@"Zapfino" size:16];
  self.customFontDynamicController.mdc_adjustsFontForContentSizeCategory = YES;

  [self.scrollView addSubview:customFontDynamicTextField];
  return customFontDynamicTextField;
}

- (MDCMultilineTextField *)setupSystemMultilineTextField {
  MDCMultilineTextField *multilineTextField = [[MDCMultilineTextField alloc] init];
  multilineTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:multilineTextField];

  multilineTextField.textView.delegate = self;

  self.multilineController =
      [[MDCTextInputControllerOutlinedTextArea alloc] initWithTextInput:multilineTextField];
  self.multilineController.placeholderText = @"Multiline Text";
  self.multilineController.mdc_adjustsFontForContentSizeCategory = NO;
  return multilineTextField;
}

- (MDCMultilineTextField *)setupSystemMultilineDynamicTextField {
  MDCMultilineTextField *multilineDynamicTextField = [[MDCMultilineTextField alloc] init];
  multilineDynamicTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:multilineDynamicTextField];

  multilineDynamicTextField.textView.delegate = self;

  self.multilineDynamicController =
      [[MDCTextInputControllerOutlinedTextArea alloc] initWithTextInput:multilineDynamicTextField];
  self.multilineDynamicController.placeholderText = @"Multiline Dynamic Text";
  self.multilineDynamicController.mdc_adjustsFontForContentSizeCategory = YES;
  return multilineDynamicTextField;
}

- (MDCMultilineTextField *)setupCustomMultilineDynamicTextField {
  MDCMultilineTextField *multilineCustomDynamicTextField = [[MDCMultilineTextField alloc] init];
  multilineCustomDynamicTextField.translatesAutoresizingMaskIntoConstraints = NO;
  [self.scrollView addSubview:multilineCustomDynamicTextField];

  multilineCustomDynamicTextField.textView.delegate = self;

  self.multilineCustomFontDynamicController =
      [[MDCTextInputControllerOutlinedTextArea alloc]
            initWithTextInput:multilineCustomDynamicTextField];
  self.multilineCustomFontDynamicController.placeholderText = @"Multiline Custom Font Dynamic Text";
  self.multilineCustomFontDynamicController.leadingUnderlineLabelFont =
      [UIFont fontWithName:@"AmericanTypewriter" size:12];
  self.customFontDynamicController.trailingUnderlineLabelFont =
      [UIFont fontWithName:@"Chalkduster" size:12];
  self.multilineCustomFontDynamicController.inlinePlaceholderFont =
      [UIFont fontWithName:@"Zapfino" size:12];
  self.multilineCustomFontDynamicController.textInputFont =
      [UIFont fontWithName:@"AmericanTypewriter" size:16];
  self.multilineCustomFontDynamicController.mdc_adjustsFontForContentSizeCategory = YES;
  return multilineCustomDynamicTextField;
}


#pragma mark - UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  [textField resignFirstResponder];

  return NO;
}

- (BOOL)textField:(UITextField *)textField
shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string {
  NSString *finishedString =
  [textField.text stringByReplacingCharactersInRange:range withString:string];

  if (textField == (UITextField *)self.systemFontController.textInput) {
    if ([finishedString rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]].length &&
        ![self.systemFontController.errorText isEqualToString:@"Error: You cannot enter numbers"]) {
      // The entered text contains numbers and we have not set an error
      [self.systemFontController setErrorText:@"You cannot enter numbers" errorAccessibilityValue:nil];

      // Since we are doing manual layout, we need to react to the expansion of the input that will
      // come from setting an error.
      [self.view setNeedsLayout];
    } else if (self.systemFontController.errorText != nil) {
      // There should be no error but error text is being shown.
      [self.systemFontController setErrorText:nil errorAccessibilityValue:nil];

      // Since we are doing manual layout, we need to react to the contraction of the input that
      // will come from setting an error.
      [self.view setNeedsLayout];
    }
  }

  if (textField == (UITextField *)self.customFontController.textInput) {
    if ([finishedString rangeOfCharacterFromSet:[[NSCharacterSet letterCharacterSet] invertedSet]]
        .length > 0) {
      [self.customFontController setErrorText:@"Error: City can only contain letters"
                errorAccessibilityValue:nil];
    } else {
      [self.customFontController setErrorText:nil errorAccessibilityValue:nil];
    }
  }
  return YES;
}

#pragma mark - UITextViewDelegate

- (void)textViewDidChange:(UITextView *)textView {
  NSLog(@"%@", textView.text);
}

#pragma mark - Gesture Handling

- (void)tapDidTouch:(UIGestureRecognizer *)sender {
  [self.view endEditing:YES];
}

#pragma mark - Keyboard Handling

- (void)registerKeyboardNotifications {
  NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];

  [defaultCenter addObserver:self
                    selector:@selector(keyboardWillShow:)
                        name:UIKeyboardWillShowNotification
                      object:nil];
  [defaultCenter addObserver:self
                    selector:@selector(keyboardWillShow:)
                        name:UIKeyboardWillChangeFrameNotification
                      object:nil];
  [defaultCenter addObserver:self
                    selector:@selector(keyboardWillHide:)
                        name:UIKeyboardWillHideNotification
                      object:nil];
}

- (void)keyboardWillShow:(NSNotification *)notif {
  CGRect keyboardFrame = [notif.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
  self.scrollView.contentInset = UIEdgeInsetsMake(0, 0, CGRectGetHeight(keyboardFrame), 0);
}

- (void)keyboardWillHide:(NSNotification *)notif {
  self.scrollView.contentInset = UIEdgeInsetsZero;
}

#pragma mark - Phone Number Validation

- (BOOL)isValidPhoneNumber:(NSString *)inputString partially:(BOOL)isPartialCheck {
  // In real life there would be much more robust validation that takes locale into account, checks
  // against invalid phone numbers (like those that begin with 0), and perhaps even auto-inserts the
  // hyphens so the user doesn't have to.

  if (inputString.length == 0) {
    return YES;
  }

  NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789-"];
  characterSet = [characterSet invertedSet];

  BOOL isValid = ![inputString rangeOfCharacterFromSet:characterSet].length;

  if (!isPartialCheck) {
    isValid = isValid && inputString.length == 12;
  } else {
    isValid = isValid && inputString.length <= 12;
  }
  return isValid;
}

@end

@implementation TextFieldCustomFontExample (CatalogByConvention)

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"Text Field", @"Custom Fonts" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return NO;
}

+ (BOOL)catalogIsPresentable {
  return NO;
}

@end