Upgrade Guide Generator

import '@vaadin/button';
import '@vaadin/select';
import '@vaadin/checkbox';
import '@vaadin/checkbox-group';
import '@vaadin/details';
import '@vaadin/notification';
import { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import type { Checkbox } from '@vaadin/checkbox';
import type { CheckboxGroupValueChangedEvent } from '@vaadin/checkbox-group';
import { Notification } from '@vaadin/notification';
import type { SelectValueChangedEvent } from '@vaadin/select';
import { selectRenderer } from '@vaadin/select/lit.js';
import { applyTheme } from 'Frontend/generated/theme';

const VAADIN_VERSIONS: Record<string, string> = {
  14: '14.11.9',
  15: '15.0.6',
  16: '16.0.5',
  17: '17.0.11',
  18: '18.0.7',
  19: '19.0.9',
  20: '20.0.8',
  21: '21.0.9',
  22: '22.0.28',
  23: '23.5.0',
};

const SIMPLE_VERSIONS = Object.keys(VAADIN_VERSIONS);

const DEFAULT_FROM = '14';
const DEFAULT_TO = '23';

const HARDCODED_VERSIONS_CLASS = 'vaadin-to-version-full';

// Apply the theme, so that overlay elements styles and custom property overrides work as expected
applyTheme(document);

@customElement('upgrade-tool')
export default class UpgradeTool extends LitElement {
  @state()
  private fromVersion = '';

  @state()
  private toVersion = '';

  @state()
  private frameworkValue: string[] = [];

  @state()
  private extraSettingsValue: string[] = [];

  private isFlow = true;
  private isFusion = false;
  private isSpring = true;
  private isTypeScript = false;
  private isCustomStyling = false;
  private isInstructionsDisplayed = false;
  private isFirstUpdated = false;

  protected override render() {
    return html`
      <div>
        <h2>Select your Vaadin versions:</h2>
        <div style="margin-bottom: 10px">${this.createSelectComponents()}</div>
        <vaadin-details>
          <div slot="summary">Earlier Versions</div>
          <ul style="margin-top: 0">
            <li>
              <a href="https://vaadin.com/docs/v14/flow/upgrading/v10-13/">
                Upgrading from Vaadin 10–13 to Vaadin 14
              </a>
            </li>
            <li>
              <a href="https://vaadin.com/docs/v14/flow/upgrading/v8/">
                Upgrading from Vaadin 8 to Vaadin 14
              </a>
            </li>
          </ul>
        </vaadin-details>
        <div style="margin-bottom: 10px">
          <vaadin-checkbox-group
            label="Framework"
            id="framework-checkbox-group"
            .value="${this.frameworkValue}"
            @value-changed=${this.frameworkChanged}
            theme="horizontal"
          >
            <vaadin-checkbox value="flow" label="Flow" id="flow-checkbox"></vaadin-checkbox>
            <vaadin-checkbox
              value="fusion"
              label="Fusion/Hilla"
              id="fusion-checkbox"
            ></vaadin-checkbox>
          </vaadin-checkbox-group>
        </div>
        <div>
          <vaadin-checkbox-group
            label="I use"
            id="extra-settings-checkbox-group"
            .value="${this.extraSettingsValue}"
            @value-changed=${this.extraSettingsChanged}
            theme="horizontal"
          >
            <vaadin-checkbox
              value="spring"
              label="Spring Boot"
              id="spring-checkbox"
              ?disabled=${this.isFusion || (!this.isFusion && !this.isFlow)}
            ></vaadin-checkbox>
            <vaadin-checkbox
              value="typescript"
              label="TypeScript-based views"
              id="typescript-checkbox"
              ?disabled=${this.isFusion || (!this.isFusion && !this.isFlow)}
            ></vaadin-checkbox>
            <vaadin-checkbox
              value="styling"
              label="Changes to custom styling of components"
              id="styling-checkbox"
            ></vaadin-checkbox>
          </vaadin-checkbox-group>
        </div>
        <vaadin-button
          theme="primary"
          style="width: fit-content; margin-top: 30px; margin-bottom: 30px"
          @click=${this.showUpdateInstructions}
        >
          Show update instructions!
        </vaadin-button>
      </div>
    `;
  }

  createRenderRoot() {
    return this;
  }

  private showUpdateInstructions() {
    this.hideOldInstructions();
    this.replaceHardCodedVersions();

    if (this.isFlow || this.isFusion) {
      this.showElementsWithClassname('all');
    } else {
      Notification.show('Select a framework');
      return;
    }

    const versionSectionElements: HTMLElement[] = this.getVersionSectionElements(
      this.fromVersion,
      this.toVersion
    );
    versionSectionElements.forEach((e) => this.setElementVisible(e, true));

    if (this.isSpring) {
      this.showElementsWithClassname('spring');
    }

    if (this.isTypeScript) {
      this.showElementsWithClassname('ts');
    }

    if (this.isCustomStyling) {
      this.showElementsWithClassname('styling');
    }

    if (this.isFlow) {
      this.showElementsWithClassname('flow');
    }

    if (this.isFusion) {
      this.showElementsWithClassname('fusion');
    }

    // A one time hack for 14 -> 23 upgrade
    this.perform14To23CleanupIfNecessary();

    this.isInstructionsDisplayed = true;
    this.updateUrlParameters();
  }

  private hideMatchingElements(types: string[]) {
    const selector = types.map((type) => `[class*="${type}"]`).join(', ');

    document.querySelectorAll<HTMLElement>(selector).forEach((elem) => {
      this.setElementVisible(elem, false);
    });
  }

  private perform14To23CleanupIfNecessary() {
    if (!this.is14To23Upgrade()) {
      return;
    }

    this.hideMatchingElements(['all', 'spring']);
  }

  private is14To23Upgrade() {
    return this.fromVersion === '14' && this.toVersion === '23';
  }

  private showElementsWithClassname(classname: string) {
    this.getElementsByClassname(classname).forEach((e) => this.setElementVisible(e, true));
  }

  private getVersionSectionElements(fromVersion: string, toVersion: string) {
    const elementsToShow: HTMLElement[] = [];
    const classname = `v${fromVersion}-${toVersion}`;
    const elements = this.getElementsByClassname(classname);

    if (elements.length > 0) {
      elementsToShow.push(...elements);
    } else {
      const idx = SIMPLE_VERSIONS.indexOf(fromVersion);
      const nextVersion = SIMPLE_VERSIONS[idx + 1];
      elementsToShow.push(...this.getVersionSectionElements(fromVersion, nextVersion));
      elementsToShow.push(...this.getVersionSectionElements(nextVersion, toVersion));
    }

    return elementsToShow;
  }

  private setElementVisible(element: HTMLElement, isVisible: boolean): void {
    if (isVisible) {
      element.style.setProperty('display', 'block');
    } else {
      element.style.setProperty('display', 'none');
    }
  }

  private getElementsByClassname(classname: string) {
    return [...document.querySelectorAll<HTMLElement>(`.${classname}`)];
  }

  private hideOldInstructions() {
    this.hideMatchingElements([
      'all',
      'flow',
      'fusion',
      'spring',
      'ts',
      'styling',
      'v1',
      'v2',
      'v3',
      'v4',
    ]);

    this.isInstructionsDisplayed = false;
  }

  private replaceHardCodedVersions() {
    this.getElementsByClassname(HARDCODED_VERSIONS_CLASS).forEach((e) => {
      e.textContent = VAADIN_VERSIONS[this.toVersion];
    });
  }

  private createSelectComponents() {
    const fromVersionList = SIMPLE_VERSIONS.slice(0, -1);
    const toVersionList = SIMPLE_VERSIONS.slice(1);
    return html`
      <vaadin-select
        label="From"
        id="from-select"
        style="width: fit-content; margin-right: 10px"
        value=${this.fromVersion}
        @value-changed=${this.fromVersionChanged}
        ${selectRenderer(
          () => html`
            <vaadin-list-box>
              ${fromVersionList.map((v) => html`<vaadin-item value="${v}">${v}</vaadin-item>`)}
            </vaadin-list-box>
          `,
          []
        )}
      ></vaadin-select>
      <vaadin-select
        label="To"
        id="to-select"
        value=${this.toVersion}
        @value-changed=${this.toVersionChanged}
        ${selectRenderer(
          () => html`
            <vaadin-list-box>
              ${toVersionList.map(
                (v) =>
                  html`
                    <vaadin-item value="${v}" ?hidden=${v <= this.fromVersion}>${v}</vaadin-item>
                  `
              )}
            </vaadin-list-box>
          `,
          []
        )}
      ></vaadin-select>
    `;
  }

  private fromVersionChanged(e: SelectValueChangedEvent) {
    if (!this.isFirstUpdated) {
      return;
    }

    const val = e.detail.value;
    if (parseInt(val) >= parseInt(this.toVersion)) {
      const idx = SIMPLE_VERSIONS.indexOf(val);
      this.toVersion = SIMPLE_VERSIONS[idx + 1];
    }
    this.fromVersion = val;
    this.updateUrlParameters();
  }

  private toVersionChanged(e: SelectValueChangedEvent) {
    if (!this.isFirstUpdated) {
      return;
    }

    this.toVersion = e.detail.value;
    this.updateUrlParameters();
  }

  private frameworkChanged(e: CheckboxGroupValueChangedEvent) {
    if (!this.isFirstUpdated) {
      return;
    }

    const val = e.detail.value;
    this.frameworkValue = val;

    this.isFlow = val.includes('flow');

    if (this.frameworkValue.includes('fusion')) {
      this.isFusion = true;
      this.isSpring = true;
      this.isTypeScript = true;

      ['spring', 'typescript'].forEach((v) => {
        if (!this.extraSettingsValue.includes(v)) {
          this.extraSettingsValue.push(v);
        }
        const checkbox = document.getElementById(`${v}-checkbox`) as Checkbox;
        checkbox.checked = true;
      });
    } else {
      this.isFusion = false;
    }

    this.updateUrlParameters();
  }

  private extraSettingsChanged(e: CheckboxGroupValueChangedEvent) {
    if (!this.isFirstUpdated) {
      return;
    }

    const val = e.detail.value;
    this.extraSettingsValue = val;

    this.isSpring = val.includes('spring') || this.isFusion;
    this.isTypeScript = val.includes('typescript') || this.isFusion;
    this.isCustomStyling = val.includes('styling');

    this.updateUrlParameters();
  }

  private updateUrlParameters() {
    const urlParams = new URLSearchParams(window.location.search);
    urlParams.set('from', this.fromVersion);
    urlParams.set('to', this.toVersion);
    urlParams.set('isFlow', String(this.isFlow));
    urlParams.set('isFusion', String(this.isFusion));
    urlParams.set('isSpring', String(this.isSpring));
    urlParams.set('isTypeScript', String(this.isTypeScript));
    urlParams.set('isCustomStyling', String(this.isCustomStyling));
    urlParams.set('isInstructionsDisplayed', String(this.isInstructionsDisplayed));

    const pathname = location.pathname.replace(/\/$/, '');
    window.history.replaceState({}, '', `${pathname}/?${urlParams}`);
  }

  private getParamVal(urlParams: URLSearchParams, param: string) {
    const isParam = urlParams.get(param);

    if (isParam) {
      const property = Boolean(JSON.parse(isParam));
      return property;
    }

    return null;
  }

  private initializeProperties() {
    if (this.isFlow) {
      this.frameworkValue.push('flow');
    }
    if (this.isFusion) {
      this.frameworkValue.push('fusion');
    }

    if (this.isSpring) {
      this.extraSettingsValue.push('spring');
    }
    if (this.isTypeScript) {
      this.extraSettingsValue.push('typescript');
    }
    if (this.isCustomStyling) {
      this.extraSettingsValue.push('styling');
    }

    this.frameworkValue = [...this.frameworkValue];
    this.extraSettingsValue = [...this.extraSettingsValue];
  }

  connectedCallback() {
    super.connectedCallback();
    this.removeLinksFromHeaders();
  }

  private removeLinksFromHeaders() {
    // Remove links from headers as clicking them resets the query parameters.
    const anchors = document.getElementsByTagName('a');
    Array.from(anchors).forEach((a) => {
      const parent = a.parentNode;
      if (parent && parent.nodeName === 'H2') {
        a.remove();
      }
    });
  }

  protected override firstUpdated() {
    const urlParams = new URLSearchParams(window.location.search);
    const fromParam = urlParams.get('from');
    const toParam = urlParams.get('to');

    this.fromVersion = fromParam ?? DEFAULT_FROM;
    this.toVersion = toParam ?? DEFAULT_TO;

    const isFlowParam = this.getParamVal(urlParams, 'isFlow');
    const isFusionParam = this.getParamVal(urlParams, 'isFusion');
    const isSpringParam = this.getParamVal(urlParams, 'isSpring');
    const isTypeScriptParam = this.getParamVal(urlParams, 'isTypeScript');
    const isCustomStylingParam = this.getParamVal(urlParams, 'isCustomStyling');
    const isInstructionsDisplayedParam = this.getParamVal(urlParams, 'isInstructionsDisplayed');

    if (isFlowParam != null) {
      this.isFlow = isFlowParam;
    }
    if (isFusionParam != null) {
      this.isFusion = isFusionParam;
    }
    if (isSpringParam != null) {
      this.isSpring = isSpringParam;
    }
    if (isTypeScriptParam != null) {
      this.isTypeScript = isTypeScriptParam;
    }
    if (isCustomStylingParam != null) {
      this.isCustomStyling = isCustomStylingParam;
    }

    this.initializeProperties();

    this.isFirstUpdated = true;
    this.updateUrlParameters();

    if (isInstructionsDisplayedParam) {
      this.isInstructionsDisplayed = true;
      this.showUpdateInstructions();
    }
  }
}