/**
 * Copyright Aquera Inc 2023
 *
 * This source code is licensed under the BSD-3-Clause license found in the
 * LICENSE file in the root directory of this source tree.
 */

import {LitElement, html, CSSResultArray, TemplateResult} from 'lit';
import { customElement, property } from 'lit/decorators.js';
import {styles} from './nile-textarea.css';
import { classMap } from 'lit/directives/class-map.js';
import { query, state } from 'lit/decorators.js';
import { defaultValue } from '../internal/default-value';
import { HasSlotController } from '../internal/slot';
import { ifDefined } from 'lit/directives/if-defined.js';
import { live } from 'lit/directives/live.js';
import { watch } from '../internal/watch';
import NileElement from '../internal/nile-element';
import type { CSSResultGroup } from 'lit';
import { unsafeHTML } from 'lit/directives/unsafe-html.js';

/**
 * @summary Textareas collect data from the user and allow multiple lines of text.
 * @tag nile-text-area

 *
 * @slot label - The textarea's label. Alternatively, you can use the `label` attribute.
 * @slot help-text - Text that describes how to use the input. Alternatively, you can use the `help-text` attribute.
 *
 * @event nile-blur - Emitted when the control loses focus.
 * @event nile-change - Emitted when an alteration to the control's value is committed by the user.
 * @event nile-focus - Emitted when the control gains focus.
 * @event nile-input - Emitted when the control receives input.
 *
 * @csspart form-control - The form control that wraps the label, input, and help text.
 * @csspart form-control-label - The label's wrapper.
 * @csspart form-control-input - The input's wrapper.
 * @csspart form-control-help-text - The help text's wrapper.
 * @csspart base - The component's base wrapper.
 * @csspart textarea - The internal `<textarea>` control.
 */

@customElement('nile-textarea')
export class NileTextarea extends NileElement  {
  static styles: CSSResultGroup = styles;

  private readonly hasSlotController = new HasSlotController(this, 'help-text', 'label');
  private resizeObserver: ResizeObserver;

  @query('.textarea__control') input: HTMLTextAreaElement;

  @state() private hasFocus = false;
  @property() title = ''; // make reactive to pass through

  /** The name of the textarea, submitted as a name/value pair with form data. */
  @property() name = '';

  /** The current value of the textarea, submitted as a name/value pair with form data. */
  @property() value = '';

  /** The textarea's size. */
  @property({ reflect: true }) size = 'medium';

  /** Draws a filled textarea. */
  @property({ type: Boolean, reflect: true }) filled = false;

  /** The textarea's label. If you need to display HTML, use the `label` slot instead. */
  @property() label = '';

  @property({ attribute: 'help-text', reflect: true }) helpText = '';

  @property({ attribute: 'error-message', reflect: true }) errorMessage = '';;

  /** Placeholder text to show as a hint when the input is empty. */
  @property() placeholder = '';

  /** The number of rows to display by default. */
  @property({ type: Number }) rows = 4;

  /** Controls how the textarea can be resized. */
  @property() resize: 'none' | 'vertical' | 'auto' = 'vertical';

  /** Disables the textarea. */
  @property({ type: Boolean, reflect: true }) disabled = false;

  /** Makes the textarea readonly. */
  @property({ type: Boolean, reflect: true }) readonly = false;

  /**
   * By default, form controls are associated with the nearest containing `<form>` element. This attribute allows you
   * to place the form control outside of a form and associate it with the form that has this `id`. The form must be in
   * the same document or shadow root for this to work.
   */
  @property({ reflect: true }) form = '';

  /** Makes the textarea a required field. */
  @property({ type: Boolean, reflect: true }) required = false;

  @property({ type: Number }) minlength: number;

  @property({ type: Number }) maxlength: number;

  /** Sets the input to a warning state, changing its visual appearance. */
  @property({ type: Boolean }) warning = false;

  /** Sets the input to an error state, changing its visual appearance. */
  @property({ type: Boolean }) error = false;

  /** Sets the input to a success state, changing its visual appearance. */
  @property({ type: Boolean }) success = false;

  /** Controls whether and how text input is automatically capitalized as it is entered by the user. */
  @property() autocapitalize: 'off' | 'none' | 'on' | 'sentences' | 'words' | 'characters';

  /** Indicates whether the browser's autocorrect feature is on or off. */
  @property() autocorrect: string;

  /**
   * Specifies what permission the browser has to provide assistance in filling out form field values. Refer to
   * [this page on MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete) for available values.
   */
  @property() autocomplete: string;

  /** Indicates that the input should receive focus on page load. */
  @property({ type: Boolean }) autofocus: boolean;

  /** Used to customize the label or icon of the Enter key on virtual keyboards. */
  @property() enterkeyhint: 'enter' | 'done' | 'go' | 'next' | 'previous' | 'search' | 'send';

  /** Enables spell checking on the textarea. */
  @property({
    type: Boolean,
    converter: {
      // Allow "true|false" attribute values but keep the property boolean
      fromAttribute: value => (!value || value === 'false' ? false : true),
      toAttribute: value => (value ? 'true' : 'false')
    }
  })
  spellcheck = true;

  /**
   * Tells the browser what type of data will be entered by the user, allowing it to display the appropriate virtual
   * keyboard on supportive devices.
   */
  @property() inputmode: 'none' | 'text' | 'decimal' | 'numeric' | 'tel' | 'search' | 'email' | 'url';

  /** The default value of the form control. Primarily used for resetting the form control. */
  @defaultValue() defaultValue = '';

  @property({ type: Boolean, reflect: true }) fullHeight = false;

  @property({type: Boolean}) checkNonPrintableChar: boolean = false;

  @state() hasPrintableCharacters: boolean = false;

  @state() markedValue: string;

  connectedCallback() {
    super.connectedCallback();
    this.resizeObserver = new ResizeObserver(() => this.setTextareaHeight());

    this.updateComplete.then(() => {
      this.setTextareaHeight();
      this.resizeObserver.observe(this.input);
    });


    if(this.fullHeight){
    requestAnimationFrame(() => {
      let parentHeight = this.parentElement?.getBoundingClientRect().height;
      if (parentHeight) {
        parentHeight = parentHeight - 65;
        if (parentHeight<12) {
          parentHeight=12;
        }
        this.shadowRoot?.querySelector('textarea')?.style.setProperty('height', `${parentHeight}px`);
      }
    });
    }

    this.emit('nile-init');
  }

  disconnectedCallback() {
    super.disconnectedCallback();
    if(this.input) {
          this.resizeObserver.unobserve(this.input);
    }
    this.emit('nile-destroy');
  }

  private handleBlur() {
    this.hasFocus = false;
    this.emit('nile-blur', { value: this.value });
  }

  private handleChange() {
    this.value = this.input.value;
    this.setTextareaHeight();
    this.emit('nile-change', { value: this.value });
  }

  private handleFocus() {
    this.hasFocus = true;
    this.emit('nile-focus', { value: this.value });
  }

  private handleInput() {
    this.value = this.input.value;
    this.emit('nile-input', { value: this.value });
  }

  private setTextareaHeight() {
    if (this.resize === 'auto') {
      this.input.style.height = 'auto';
      this.input.style.height = `${this.input.scrollHeight}px`;
    } else {
      (this.input.style.height as string | undefined) = undefined;
    }
  }

  @watch('rows', { waitUntilFirstUpdate: true })
  handleRowsChange() {
    this.setTextareaHeight();
  }

  @watch('value', { waitUntilFirstUpdate: true })
  async handleValueChange() {
    await this.updateComplete;
    this.setTextareaHeight();

    if(this.checkNonPrintableChar){
      this.markNonPrintableCharacters();
    }
  }

  /** checks non printable characters in the value. */
  markNonPrintableCharacters() {
    let markedValue = '';
    this.hasPrintableCharacters = false;
    if (this.value) {
      for (let i = 0, n = this.value.length; i < n; i++) {
        const charCode = this.value.charCodeAt(i);

        if ((charCode > 255 && charCode !== 9109) || [129, 143, 144, 157, 160].includes(charCode)) {
          markedValue += `<span class="input__srtiked-text">${this.value.charAt(i)}</span>`;
          this.hasPrintableCharacters = true;
        } else {
          markedValue += this.value.charAt(i);
        }
      }
    }

    this.markedValue = markedValue;
    this.emit('nile-value-marked', { value: this.markedValue, hasNonPrintableCharacters: this.hasPrintableCharacters });
  }


  /** Removes all non printable characters from the value. */
  removeAllNonPrintableCharacters() {
    let cleanedValue = '';

    if (this.value) {
      for (let i = 0, n = this.value.length; i < n; i++) {
        const charCode = this.value.charCodeAt(i);

        // Consider a character printable if it's not in the specified non-printable ranges
        if (!(charCode > 255 && charCode !== 9109) && ![129, 143, 144, 157, 160].includes(charCode)) {
          cleanedValue += this.value.charAt(i);
        }
      }
    }

    this.value = cleanedValue;
    this.emit('nile-npchar-removed', { value: this.value });

  }
  /** Sets focus on the textarea. */
  focus(options?: FocusOptions) {
    this.input.focus(options);
  }

  /** Removes focus from the textarea. */
  blur() {
    this.input.blur();
  }

  /** Selects all the text in the textarea. */
  select() {
    this.input.select();
  }

  /** Gets or sets the textarea's scroll position. */
  scrollPosition(position?: { top?: number; left?: number }): { top: number; left: number } | undefined {
    if (position) {
      if (typeof position.top === 'number') this.input.scrollTop = position.top;
      if (typeof position.left === 'number') this.input.scrollLeft = position.left;
      return undefined;
    }

    return {
      top: this.input.scrollTop,
      left: this.input.scrollTop
    };
  }

  /** Sets the start and end positions of the text selection (0-based). */
  setSelectionRange(
    selectionStart: number,
    selectionEnd: number,
    selectionDirection: 'forward' | 'backward' | 'none' = 'none'
  ) {
    this.input.setSelectionRange(selectionStart, selectionEnd, selectionDirection);
  }

  /** Replaces a range of text with a new string. */
  setRangeText(
    replacement: string,
    start?: number,
    end?: number,
    selectMode?: 'select' | 'start' | 'end' | 'preserve'
  ) {
    // @ts-expect-error - start, end, and selectMode are optional
    this.input.setRangeText(replacement, start, end, selectMode);

    if (this.value !== this.input.value) {
      this.value = this.input.value;
    }

    if (this.value !== this.input.value) {
      this.value = this.input.value;
      this.setTextareaHeight();
    }
  }

  render() {
    const hasLabelSlot = this.hasSlotController.test('label');
    const hasHelpTextSlot = this.hasSlotController.test('help-text');
    const hasLabel = this.label ? true : !!hasLabelSlot;

    const hasHelpText = this.helpText ? true : false;
    const hasErrorMessage = this.errorMessage ? true : false;

    return html`
      <div
        part="form-control"
        class=${classMap({
          'form-control': true,
          'form-control--medium': this.size === 'medium',
          'form-control--has-label': hasLabel,
          'form-control--has-help-text': hasHelpText,
        })}
      >
        <label
          part="form-control-label"
          class="form-control__label"
          for="input"
          aria-hidden=${hasLabel ? 'false' : 'true'}
        >
          <slot name="label">${this.label}</slot>
        </label>

        <nile-popup
          ?active=${this.hasPrintableCharacters}
          placement="bottom-start"
          distance="5"
          strategy="fixed"
        >
          <div part="form-control-input" class="form-control-input" slot="anchor">
            <div
              part="base"
              class=${classMap({
                textarea: true,
                'textarea--medium': this.size === 'medium',
                'textarea--warning': this.warning,
                'textarea--error': this.error,
                'textarea--success': this.success,
                'textarea--standard': !this.filled,
                'textarea--disabled': this.disabled,
                'textarea--focused': this.hasFocus,
                'textarea--empty': !this.value,
                'textarea--resize-none': this.resize === 'none',
                'textarea--resize-vertical': this.resize === 'vertical',
                'textarea--resize-auto': this.resize === 'auto',
              })}
            >
              <textarea
                part="textarea"
                id="input"
                class="textarea__control"
                title=${
                  this
                    .title /* An empty title prevents browser validation tooltips from appearing on hover */
                }
                name=${ifDefined(this.name)}
                .value=${live(this.value)}
                ?disabled=${this.disabled}
                ?readonly=${this.readonly}
                ?required=${this.required}
                placeholder=${ifDefined(this.placeholder)}
                rows=${ifDefined(this.rows)}
                minlength=${ifDefined(this.minlength)}
                maxlength=${ifDefined(this.maxlength)}
                autocapitalize=${ifDefined(this.autocapitalize)}
                autocorrect=${ifDefined(this.autocorrect)}
                ?autofocus=${this.autofocus}
                spellcheck=${ifDefined(this.spellcheck)}
                enterkeyhint=${ifDefined(this.enterkeyhint)}
                inputmode=${ifDefined(this.inputmode)}
                aria-describedby="help-text"
                @change=${this.handleChange}
                @input=${this.handleInput}
                @focus=${this.handleFocus}
                @blur=${this.handleBlur}
              ></textarea>
            </div>

            ${hasHelpText
            ? html`
                <nile-form-help-text>${this.helpText}</nile-form-help-text>
              `
            : ``}
          ${hasErrorMessage
            ? html`
                <nile-form-error-message
                  >${this.errorMessage}</nile-form-error-message
                >
              `
            : ``}

          </div>
          <div class="input__non-printable">
            Non-printable character detected.
            <nile-badge
              variant="error"
              @click=${this.removeAllNonPrintableCharacters}
              class="input__remove-non-printable"
            >
              Remove All
            </nile-badge>

            <div class="input__srtiked-text-container">
              ${unsafeHTML(this.markedValue)}
            </div>
          </div>
        </nile-popup>
      </div>
    `;
  }
}

export default NileTextarea;

declare global {
  interface HTMLElementTagNameMap {
    'nile-textarea': NileTextarea;
  }
}