/*
 Copyright 2016-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 <UIKit/UIKit.h>

#import "MaterialTextFields.h"

#import "supplemental/TextFieldControllerStylesExampleSupplemental.h"

@interface TextFieldControllerStylesExample ()

// Be sure to keep your controllers in memory somewhere like a property:
@property(nonatomic, strong) MDCTextInputControllerOutlined *textFieldControllerOutlined;
@property(nonatomic, strong) MDCTextInputControllerFilled *textFieldControllerFilled;
@property(nonatomic, strong) MDCTextInputControllerUnderline *textFieldControllerUnderline;

@end

@implementation TextFieldControllerStylesExample

- (void)viewDidLoad {
  [super viewDidLoad];

  self.view.backgroundColor = [UIColor colorWithWhite:0.97f alpha:1.0f];
  self.title = @"Material Text Fields";

  [self setupExampleViews];
  [self setupTextFields];
  [self registerKeyboardNotifications];
}

- (void)setupTextFields {
  // Default with Character Count and Floating Placeholder Text Fields

  // First the text field is added to the view hierarchy
  MDCTextField *textFieldOutlined = [[MDCTextField alloc] init];
  [self.scrollView addSubview:textFieldOutlined];
  textFieldOutlined.translatesAutoresizingMaskIntoConstraints = NO;

  int characterCountMax = 25;
  textFieldOutlined.delegate = self;
  textFieldOutlined.clearButtonMode = UITextFieldViewModeAlways;

  // Second the controller is created to manage the text field
  self.textFieldControllerOutlined =
      [[MDCTextInputControllerOutlined alloc] initWithTextInput:textFieldOutlined];
  self.textFieldControllerOutlined.placeholderText =
      @"MDCTextInputControllerOutlined";
  self.textFieldControllerOutlined.characterCountMax = characterCountMax;

  [self.textFieldControllerOutlined mdc_setAdjustsFontForContentSizeCategory:YES];

  MDCTextField *textFieldFilled = [[MDCTextField alloc] init];
  [self.scrollView addSubview:textFieldFilled];
  textFieldFilled.translatesAutoresizingMaskIntoConstraints = NO;

  textFieldFilled.delegate = self;
  textFieldFilled.clearButtonMode = UITextFieldViewModeUnlessEditing;

  self.textFieldControllerFilled =
      [[MDCTextInputControllerFilled alloc] initWithTextInput:textFieldFilled];
  self.textFieldControllerFilled.placeholderText = @"MDCTextInputControllerFilled";
  self.textFieldControllerFilled.characterCountMax = characterCountMax;

  [self.textFieldControllerFilled mdc_setAdjustsFontForContentSizeCategory:YES];

  [NSLayoutConstraint
      activateConstraints:[NSLayoutConstraint
                              constraintsWithVisualFormat:@"V:[charMax]-[floating]"
                                                  options:NSLayoutFormatAlignAllLeading |
                                                          NSLayoutFormatAlignAllTrailing
                                                  metrics:nil
                                                    views:@{
                                                      @"charMax" : textFieldOutlined,
                                                      @"floating" : textFieldFilled
                                                    }]];
  [NSLayoutConstraint constraintWithItem:textFieldOutlined
                               attribute:NSLayoutAttributeLeading
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                               attribute:NSLayoutAttributeLeadingMargin
                              multiplier:1
                                constant:0]
      .active = YES;
  [NSLayoutConstraint constraintWithItem:textFieldOutlined
                               attribute:NSLayoutAttributeTrailing
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                               attribute:NSLayoutAttributeTrailingMargin
                              multiplier:1
                                constant:0]
      .active = YES;
  [NSLayoutConstraint constraintWithItem:textFieldOutlined
                               attribute:NSLayoutAttributeTrailing
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.scrollView
                               attribute:NSLayoutAttributeTrailingMargin
                              multiplier:1
                                constant:0]
      .active = YES;

  // Full Width Text Field
  MDCTextField *textFieldUnderline = [[MDCTextField alloc] init];
  [self.scrollView addSubview:textFieldUnderline];
  textFieldUnderline.translatesAutoresizingMaskIntoConstraints = NO;

  textFieldUnderline.delegate = self;
  textFieldUnderline.clearButtonMode = UITextFieldViewModeUnlessEditing;

  self.textFieldControllerUnderline =
      [[MDCTextInputControllerUnderline alloc] initWithTextInput:textFieldUnderline];
  self.textFieldControllerUnderline.placeholderText = @"MDCTextInputControllerUnderline";
  self.textFieldControllerUnderline.characterCountMax = characterCountMax;

  [self.textFieldControllerUnderline mdc_setAdjustsFontForContentSizeCategory:YES];

  [NSLayoutConstraint constraintWithItem:textFieldUnderline
                               attribute:NSLayoutAttributeTop
                               relatedBy:NSLayoutRelationEqual
                                  toItem:textFieldFilled
                               attribute:NSLayoutAttributeBottom
                              multiplier:1
                                constant:1]
      .active = YES;
  [NSLayoutConstraint constraintWithItem:textFieldUnderline
                               attribute:NSLayoutAttributeLeading
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                               attribute:NSLayoutAttributeLeadingMargin
                              multiplier:1
                                constant:0]
      .active = YES;
  [NSLayoutConstraint constraintWithItem:textFieldUnderline
                               attribute:NSLayoutAttributeTrailing
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                               attribute:NSLayoutAttributeTrailingMargin
                              multiplier:1
                                constant:0]
      .active = YES;

#if defined(__IPHONE_11_0) && (__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_11_0)
  if (@available(iOS 11.0, *)) {
    [NSLayoutConstraint constraintWithItem:textFieldOutlined
                                 attribute:NSLayoutAttributeTop
                                 relatedBy:NSLayoutRelationEqual
                                    toItem:self.scrollView.contentLayoutGuide
                                 attribute:NSLayoutAttributeTop
                                multiplier:1
                                  constant:20]
        .active = YES;
    [NSLayoutConstraint constraintWithItem:textFieldOutlined
                                 attribute:NSLayoutAttributeBottom
                                 relatedBy:NSLayoutRelationEqual
                                    toItem:self.scrollView.contentLayoutGuide
                                 attribute:NSLayoutAttributeBottom
                                multiplier:1
                                  constant:-20]
    .active = YES;
  } else {
    [NSLayoutConstraint constraintWithItem:textFieldOutlined
                                 attribute:NSLayoutAttributeTop
                                 relatedBy:NSLayoutRelationEqual
                                    toItem:self.scrollView
                                 attribute:NSLayoutAttributeTop
                                multiplier:1
                                  constant:20]
        .active = YES;
    [NSLayoutConstraint constraintWithItem:textFieldOutlined
                                 attribute:NSLayoutAttributeBottom
                                 relatedBy:NSLayoutRelationEqual
                                    toItem:self.scrollView
                                 attribute:NSLayoutAttributeBottom
                                multiplier:1
                                  constant:-20]
    .active = YES;
  }
#else
  [NSLayoutConstraint constraintWithItem:textFieldOutlined
                               attribute:NSLayoutAttributeTop
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.scrollView
                               attribute:NSLayoutAttributeTop
                              multiplier:1
                                constant:20]
      .active = YES;

  [NSLayoutConstraint constraintWithItem:textFieldOutlined
                               attribute:NSLayoutAttributeBottom
                               relatedBy:NSLayoutRelationLessThanOrEqual
                                  toItem:self.scrollView
                               attribute:NSLayoutAttributeTop
                              multiplier:1
                                constant:-20]
  .active = YES;
#endif

}

#pragma mark - UITextFieldDelegate

// All the usual UITextFieldDelegate methods work with MDCTextField
- (BOOL)textField:(UITextField *)textField
    shouldChangeCharactersInRange:(NSRange)range
                replacementString:(NSString *)string {
  return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  [textField resignFirstResponder];
  return NO;
}

#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:UIKeyboardDidChangeFrameNotification
                      object:nil];
  [defaultCenter addObserver:self
                    selector:@selector(keyboardWillHide:)
                        name:UIKeyboardWillHideNotification
                      object:nil];
}

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

- (void)keyboardWillHide:(NSNotification *)notification {
  self.scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
}


@end