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 * @license
 * FOURBURNER CONFIDENTIAL
 * Unpublished Copyright (C) 2021 FourBurner Technologies, Inc. All Rights Reserved.
 *
 * NOTICE: All information contained herein is, and remains the property of FOURBURNER TECHNOLOGIES,
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 * The copyright notice above does not evidence any actual or intended publication or disclosure of
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import {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';
import {getSupportedInputTypes, Platform} from '@angular/cdk/platform';
import {AutofillMonitor} from '@angular/cdk/text-field';
import {
  AfterViewInit,
  Directive,
  DoCheck,
  ElementRef,
  Inject,
  Input,
  NgZone,
  OnChanges,
  OnDestroy,
  Optional,
  Self,
} from '@angular/core';
import {FormGroupDirective, NgControl, NgForm, Validators} from '@angular/forms';
import {CanUpdateErrorState, ErrorStateMatcher, mixinErrorState, ngDevMode} from '@twnd/ux/core';
import {TWNDFormControl, TWNDForm, TWND_FORM} from '@twnd/ux/form';
import {Subject} from 'rxjs';
import {getTWNDInputUnsupportedTypeError} from './input.errors';
import {TWND_INPUT_VALUE_ACCESSOR} from './input.value-accessor';

// Invalid input type. Using one of these will throw an TWNDInputUnsupportedTypeError.
const TWND_INPUT_INVALID_TYPES = [
  'button',
  'checkbox',
  'file',
  'hidden',
  'image',
  'radio',
  'range',
  'reset',
  'submit',
];

let nextUniqueId = 0;

// Boilerplate for applying mixins to TWNDInput.
/** @docs-private */
const _TWNDInputBase = mixinErrorState(
  class {
    constructor(
      public _defaultErrorStateMatcher: ErrorStateMatcher,
      public _parentForm: NgForm,
      public _parentFormGroup: FormGroupDirective,
      /** @docs-private */
      public ngControl: NgControl,
    )
    {}
  },
);

/** Directive that allows a native input to work inside a `TWNDFormField`. */
@Directive({
  selector : `input[twndInput], textarea[twndInput], select[twndNativeControl],
      input[twndNativeControl], textarea[twndNativeControl]`,
  exportAs : 'twndInput',
  host : {
          /**
          * @breaking-change 8.0.0 remove .twnd-form-field-autofill-control in favor of AutofillMonitor.
          */
    'class' : 'twnd-input-element twnd-form-field-autofill-control',
          '[class.twnd-input-server]' : '_isServer',
          // Native input properties that are overwritten by Angular inputs need to be synced with
    // the native input element. Otherwise property bindings for those don't work.
    '[attr.id]' : 'id',
          // At the time of writing, we have a lot of customer tests that look up the input based on its
    // placeholder. Since we sometimes omit the placeholder attribute from the DOM to prevent screen
    // readers from reading it twice, we have to keep it somewhere in the DOM for the lookup.
    '[attr.data-placeholder]' : 'placeholder',
          '[disabled]' : 'disabled',
          '[required]' : 'required',
          '[attr.readonly]' : 'readonly && !_isNativeSelect || null',
          '[class.twnd-native-select-inline]' : '_isInlineSelect()',
          // Only mark the input as invalid for assistive technology if it has a value since the
    // state usually overlaps with `aria-required` when the input is empty and can be redundant.
    '[attr.aria-invalid]' : '(empty && required) ? null : errorState',
          '[attr.aria-required]' : 'required',
          '(focus)' : '_focusChanged(true)',
          '(blur)' : '_focusChanged(false)',
          '(input)' : '_onInput()',
          },
  providers : [ {provide : TWNDFormControl,                       useExisting : TWNDInput                }
    ],
})
export class TWNDInput extends _TWNDInputBase implements TWNDFormControl<any>, OnChanges, OnDestroy,
                                                         AfterViewInit, DoCheck, CanUpdateErrorState
{
  protected _uid = `twnd-input-${nextUniqueId++}`;
  protected _previousNativeValue: any;
  private _inputValueAccessor: {value: any};
  private _previousPlaceholder: string|null;

  /** Whether the component is being rendered on the server. */
  readonly _isServer: boolean;

  /** Whether the component is a native html select. */
  readonly _isNativeSelect: boolean;

  /** Whether the component is a textarea. */
  readonly _isTextarea: boolean;

  /** Whether the input is inside of a form field. */
  readonly _isInFormField: boolean;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  focused: boolean = false;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  override readonly stateChanges: Subject<void> = new Subject<void>();

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  controlType: string = 'twnd-input';

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  autofilled = false;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input() get disabled(): boolean
  {
    if (this.ngControl && this.ngControl.disabled !== null) {
      return this.ngControl.disabled;
    }
    return this._disabled;
  }
  set disabled(value: boolean)
  {
    this._disabled = coerceBooleanProperty(value);

    // Browsers may not fire the blur event if the input is disabled too quickly.
    // Reset from here to ensure that the element doesn't become stuck.
    if (this.focused) {
      this.focused = false;
      this.stateChanges.next();
    }
  }
  protected _disabled = false;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input() get id(): string
  {
    return this._id;
  }
  set id(value: string)
  {
    this._id = value || this._uid;
  }
  protected _id: string;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input() placeholder: string;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input() get required(): boolean
  {
    return this._required ?? this.ngControl?.control?.hasValidator(Validators.required) ?? false;
  }
  set required(value: boolean)
  {
    this._required = coerceBooleanProperty(value);
  }
  protected _required: boolean|undefined;

  /** Input type of the element. */
  @Input() get type(): string
  {
    return this._type;
  }
  set type(value: string)
  {
    this._type = value || 'text';
    this._validateType();

    // When using Angular inputs, developers are no longer able to set the properties on the native
    // input element. To ensure that bindings for `type` work, we need to sync the setter
    // with the native property. Textarea elements don't support the type property or attribute.
    if (!this._isTextarea && getSupportedInputTypes().has(this._type)) {
      (this._elementRef.nativeElement as HTMLInputElement).type = this._type;
    }
  }
  protected _type = 'text';

  /** An object used to control when error messages are shown. */
  @Input() override errorStateMatcher: ErrorStateMatcher;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input('aria-describedby') userAriaDescribedBy: string;

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  @Input() get value(): string
  {
    return this._inputValueAccessor.value;
  }
  set value(value: string)
  {
    if (value !== this.value) {
      this._inputValueAccessor.value = value;
      this.stateChanges.next();
    }
  }

  /** Whether the element is readonly. */
  @Input() get readonly(): boolean
  {
    return this._readonly;
  }
  set readonly(value: boolean)
  {
    this._readonly = coerceBooleanProperty(value);
  }
  private _readonly = false;

  protected _neverEmptyInputTypes = [
    'date',
    'datetime',
    'datetime-local',
    'month',
    'time',
    'week',
  ].filter(t => getSupportedInputTypes().has(t));

  constructor(
    protected _elementRef: ElementRef<HTMLInputElement|HTMLSelectElement|HTMLTextAreaElement>,
    protected _platform: Platform,
    @Optional() @Self() ngControl: NgControl,
    @Optional() _parentForm: NgForm,
    @Optional() _parentFormGroup: FormGroupDirective,
    _defaultErrorStateMatcher: ErrorStateMatcher,
    @Optional() @Self() @Inject(TWND_INPUT_VALUE_ACCESSOR) inputValueAccessor: any,
    private _autofillMonitor: AutofillMonitor,
    ngZone: NgZone,
    // TODO: Remove this once the legacy appearance has been removed. We only need
    // to inject the form-field for determining whether the placeholder has been promoted.
    @Optional() @Inject(TWND_FORM) private _formField?: TWNDForm,
  )
  {
    super(_defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl);

    const element = this._elementRef.nativeElement;
    const nodeName = element.nodeName.toLowerCase();

    // If no input value accessor was explicitly specified, use the element as the input value
    // accessor.
    this._inputValueAccessor = inputValueAccessor || element;

    this._previousNativeValue = this.value;

    // Force setter to be called in case id was not specified.
    this.id = this.id;

    // On some versions of iOS the caret gets stuck in the wrong place when holding down the delete
    // key. In order to get around this we need to "jiggle" the caret loose. Since this bug only
    // exists on iOS, we only bother to install the listener on iOS.
    if (_platform.IOS) {
      ngZone.runOutsideAngular(() => {
        _elementRef.nativeElement.addEventListener('keyup', (event: Event) => {
          const el = event.target as HTMLInputElement;

          // Note: We specifically check for 0, rather than `!el.selectionStart`, because the two
          // indicate different things. If the value is 0, it means that the caret is at the start
          // of the input, whereas a value of `null` means that the input doesn't support
          // manipulating the selection range. Inputs that don't support setting the selection range
          // will throw an error so we want to avoid calling `setSelectionRange` on them. See:
          // https://html.spec.whatwg.org/multipage/input.html#do-not-apply
          if (!el.value && el.selectionStart === 0 && el.selectionEnd === 0) {
            // Note: Just setting `0, 0` doesn't fix the issue. Setting
            // `1, 1` fixes it for the first time that you type text and
            // then hold delete. Toggling to `1, 1` and then back to
            // `0, 0` seems to completely fix it.
            el.setSelectionRange(1, 1);
            el.setSelectionRange(0, 0);
          }
        });
      });
    }

    this._isServer = !this._platform.isBrowser;
    this._isNativeSelect = nodeName === 'select';
    this._isTextarea = nodeName === 'textarea';
    this._isInFormField = !!_formField;

    if (this._isNativeSelect) {
      this.controlType = (element as HTMLSelectElement).multiple ? 'twnd-native-select-multiple' :
                                                                   'twnd-native-select';
    }
  }

  ngAfterViewInit()
  {
    if (this._platform.isBrowser) {
      this._autofillMonitor.monitor(this._elementRef.nativeElement).subscribe(event => {
        this.autofilled = event.isAutofilled;
        this.stateChanges.next();
      });
    }
  }

  ngOnChanges()
  {
    this.stateChanges.next();
  }

  ngOnDestroy()
  {
    this.stateChanges.complete();

    if (this._platform.isBrowser) {
      this._autofillMonitor.stopMonitoring(this._elementRef.nativeElement);
    }
  }

  ngDoCheck()
  {
    if (this.ngControl) {
      // We need to re-evaluate this on every change detection cycle, because there are some
      // error triggers that we can't subscribe to (e.g. parent form submissions). This means
      // that whatever logic is in here has to be super lean or we risk destroying the performance.
      this.updateErrorState();
    }

    // We need to dirty-check the native element's value, because there are some cases where
    // we won't be notified when it changes (e.g. the consumer isn't using forms or they're
    // updating the value using `emitEvent: false`).
    this._dirtyCheckNativeValue();

    // We need to dirty-check and set the placeholder attribute ourselves, because whether it's
    // present or not depends on a query which is prone to "changed after checked" errors.
    this._dirtyCheckPlaceholder();
  }

  /** Focuses the input. */
  focus(options?: FocusOptions): void
  {
    this._elementRef.nativeElement.focus(options);
  }

  /** Callback for the cases where the focused state of the input changes. */
  _focusChanged(isFocused: boolean)
  {
    if (isFocused !== this.focused) {
      this.focused = isFocused;
      this.stateChanges.next();
    }
  }

  _onInput()
  {
    // This is a noop function and is used to let Angular know whenever the value changes.
    // Angular will run a new change detection each time the `input` event has been dispatched.
    // It's necessary that Angular recognizes the value change, because when floatingLabel
    // is set to false and Angular forms aren't used, the placeholder won't recognize the
    // value changes and will not disappear.
    // Listening to the input event wouldn't be necessary when the input is using the
    // FormsModule or ReactiveFormsModule, because Angular forms also listens to input events.
  }

  /** Does some manual dirty checking on the native input `placeholder` attribute. */
  private _dirtyCheckPlaceholder()
  {
    // If we're hiding the native placeholder, it should also be cleared from the DOM, otherwise
    // screen readers will read it out twice: once from the label and once from the attribute.
    // TODO: can be removed once we get rid of the `legacy` style for the form field, because it's
    // the only one that supports promoting the placeholder to a label.
    const placeholder = this._formField?._hideControlPlaceholder?.() ? null : this.placeholder;
    if (placeholder !== this._previousPlaceholder) {
      const element = this._elementRef.nativeElement;
      this._previousPlaceholder = placeholder;
      placeholder ? element.setAttribute('placeholder', placeholder) :
                    element.removeAttribute('placeholder');
    }
  }

  /** Does some manual dirty checking on the native input `value` property. */
  protected _dirtyCheckNativeValue()
  {
    const newValue = this._elementRef.nativeElement.value;

    if (this._previousNativeValue !== newValue) {
      this._previousNativeValue = newValue;
      this.stateChanges.next();
    }
  }

  /** Make sure the input is a supported type. */
  protected _validateType()
  {
    if (TWND_INPUT_INVALID_TYPES.indexOf(this._type) > -1 &&
        (typeof ngDevMode === 'undefined' || ngDevMode)) {
      throw getTWNDInputUnsupportedTypeError(this._type);
    }
  }

  /** Checks whether the input type is one of the types that are never empty. */
  protected _isNeverEmpty()
  {
    return this._neverEmptyInputTypes.indexOf(this._type) > -1;
  }

  /** Checks whether the input is invalid based on the native validation. */
  protected _isBadInput()
  {
    // The `validity` property won't be present on platform-server.
    let validity = (this._elementRef.nativeElement as HTMLInputElement).validity;
    return validity && validity.badInput;
  }

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  get empty(): boolean
  {
    return (!this._isNeverEmpty() && !this._elementRef.nativeElement.value && !this._isBadInput() &&
            !this.autofilled);
  }

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  get shouldLabelFloat(): boolean
  {
    if (this._isNativeSelect) {
      // For a single-selection `<select>`, the label should float when the selected option has
      // a non-empty display value. For a `<select multiple>`, the label *always* floats to avoid
      // overlapping the label with the options.
      const selectElement = this._elementRef.nativeElement as HTMLSelectElement;
      const firstOption: HTMLOptionElement|undefined = selectElement.options[0];

      // On most browsers the `selectedIndex` will always be 0, however on IE and Edge it'll be
      // -1 if the `value` is set to something, that isn't in the list of options, at a later point.
      return (this.focused || selectElement.multiple || !this.empty ||
              !!(selectElement.selectedIndex > -1 && firstOption && firstOption.label));
    } else {
      return this.focused || !this.empty;
    }
  }

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  setDescribedByIds(ids: string[])
  {
    if (ids.length) {
      this._elementRef.nativeElement.setAttribute('aria-describedby', ids.join(' '));
    } else {
      this._elementRef.nativeElement.removeAttribute('aria-describedby');
    }
  }

  /**
   * Implemented as part of TWNDFormFieldControl.
   * @docs-private
   */
  onContainerClick()
  {
    // Do not re-focus the input element if the element is already focused. Otherwise it can happen
    // that someone clicks on a time input and the cursor resets to the "hours" field while the
    // "minutes" field was actually clicked. See: https://github.com/angular/components/issues/12849
    if (!this.focused) {
      this.focus();
    }
  }

  /** Whether the form control is a native select that is displayed inline. */
  _isInlineSelect(): boolean
  {
    const element = this._elementRef.nativeElement as HTMLSelectElement;
    return this._isNativeSelect && (element.multiple || element.size > 1);
  }

  static ngAcceptInputType_disabled: BooleanInput;
  static ngAcceptInputType_readonly: BooleanInput;
  static ngAcceptInputType_required: BooleanInput;

  // Accept `any` to avoid conflicts with other directives on `<input>` that may
  // accept different types.
  static ngAcceptInputType_value: any;
}