department-of-veterans-affairs/vets-website

import PropTypes from 'prop-types';
import React from 'react';
import { connect } from 'react-redux';
import { withRouter } from 'react-router';
import classNames from 'classnames';
import environment from '@department-of-veterans-affairs/platform-utilities/environment';
import { getDefaultFormState } from '@department-of-veterans-affairs/react-jsonschema-form/lib/utils';
import {
  isReactComponent,
  focusElement,
  customScrollAndFocus,
  defaultFocusSelector,
} from 'platform/utilities/ui';
import get from '../../../../utilities/data/get';
import set from '../../../../utilities/data/set';

import FormNavButtons, {
  FormNavButtonContinue,
} from '../components/FormNavButtons';
import SchemaForm from '../components/SchemaForm';
import { setData, uploadFile } from '../actions';
import {
  getNextPagePath,
  getPreviousPagePath,
  checkValidPagePath,
} from '../routing';
import { DevModeNavLinks } from '../components/dev/DevModeNavLinks';
import { stringifyUrlParams } from '../helpers';

function focusForm(route, index) {
  // Check main toggle to enable custom focus
  if (route.formConfig?.useCustomScrollAndFocus) {
    const scrollAndFocusTarget =
      route.pageConfig?.scrollAndFocusTarget ||
      route.formConfig?.scrollAndFocusTarget;
    customScrollAndFocus(scrollAndFocusTarget, index);
  } else {
    focusElement(defaultFocusSelector);
  }
}

function getContentBeforeAndAfterButtons(
  route,
  contentBeforeButtons,
  contentAfterButtons,
) {
  const content = {
    contentBeforeNavButtons: contentBeforeButtons,
    contentAfterNavButtons: contentAfterButtons,
  };

  if (route.pageConfig?.hideSaveLinkAndStatus) {
    content.contentBeforeNavButtons = null;
    content.contentAfterNavButtons = null;
  } else if (route.formConfig?.showSaveLinkAfterButtons) {
    content.contentBeforeNavButtons = null;
    content.contentAfterNavButtons = (
      <>
        {contentBeforeButtons}
        {contentAfterButtons && (
          <div className="vads-u-margin-top--2">{contentAfterButtons}</div>
        )}
      </>
    );
  }

  return content;
}

class FormPage extends React.Component {
  componentDidMount() {
    this.prePopulateArrayData();
    if (!this.props.blockScrollOnMount) {
      focusForm(this.props.route, this.props?.params?.index);
    }
  }

  componentDidUpdate(prevProps) {
    if (
      prevProps.route.pageConfig.pageKey !==
        this.props.route.pageConfig.pageKey ||
      get('params.index', prevProps) !== get('params.index', this.props)
    ) {
      this.prePopulateArrayData();
      focusForm(this.props.route, this.props?.params?.index);
    }
  }

  onChange = formData => {
    const { pageConfig } = this.props.route;
    let newData = formData;
    if (pageConfig.showPagePerItem) {
      // If this is a per item page, the formData object will have data for a particular
      // row in an array, so we need to update the full form data object and then call setData
      newData = this.setArrayIndexedData(formData);
    }
    if (typeof pageConfig.updateFormData === 'function') {
      newData = pageConfig.updateFormData(
        this.formData(),
        newData,
        this.props.params.index,
      );
    }
    this.props.setData(newData);
  };

  // Navigate to the next page
  onSubmit = ({ formData }) => {
    const { form, route, location } = this.props;

    // This makes sure defaulted data on a page with no changes is saved
    // Probably safe to do this for regular pages, too, but it hasn’t been
    // necessary. Additionally, it should NOT setData for a CustomPage. The
    // CustomPage should take care of that itself.
    if (
      route.pageConfig.showPagePerItem &&
      (!route.pageConfig.CustomPage ||
        route.pageConfig.customPageUsesPagePerItemData)
    ) {
      const newData = this.setArrayIndexedData(formData);
      this.props.setData(newData);
    }

    const path = getNextPagePath(route.pageList, form.data, location.pathname);

    if (typeof route.pageConfig.onNavForward === 'function') {
      route.pageConfig.onNavForward({
        formData,
        goPath: customPath => this.props.router.push(customPath),
        goNextPath: urlParams => {
          const urlParamsString = stringifyUrlParams(urlParams);
          this.props.router.push(path + (urlParamsString || ''));
        },
        pageList: route.pageList,
        pathname: location.pathname,
        setFormData: this.props.setData,
        urlParams: location.query,
      });
      return;
    }

    this.props.router.push(path);
  };

  getArrayIndexedData = () => {
    const { route, params, form } = this.props;
    return get([route.pageConfig.arrayPath, params.index], form.data);
  };

  // returns a duplicate of formData with newData at the indexed array
  setArrayIndexedData = newData => {
    let formData = this.props.form.data;
    const { arrayPath } = this.props.route.pageConfig;
    if (!get(arrayPath, this.props.form.data)) {
      // if array doesn't exist create it
      formData = set([arrayPath], [], this.props.form.data);
    }
    return set([arrayPath, this.props.params.index], newData, formData);
  };

  prePopulateArrayData = () => {
    const { pageConfig } = this.props.route;
    // only applicable to array routes with these settings
    if (pageConfig.showPagePerItem && pageConfig.allowPathWithNoItems) {
      const arrayFormData = this.getArrayIndexedData();
      if (!arrayFormData) {
        // we are trying to visit a route where there is no formData
        // for this index in the array, so we need to create and
        // pre-populate it with empty values for SchemaForm to work properly
        const defaultData = getDefaultFormState(
          pageConfig.schema.properties[pageConfig.arrayPath].items ||
            pageConfig.schema.properties[pageConfig.arrayPath].additionalItems,
        );
        const newData = this.setArrayIndexedData(defaultData);
        this.props.setData(newData);
      }
    }
  };

  formData = () => {
    const { pageConfig } = this.props.route;
    // If it's a CustomPage, return the entire form data
    if (pageConfig.CustomPage && !pageConfig.customPageUsesPagePerItemData) {
      return this.props.form.data;
    }

    // If it's an array page, return only the data for that array item
    // Otherwise, return the data for the entire form
    return this.props.route.pageConfig.showPagePerItem
      ? this.getArrayIndexedData()
      : this.props.form.data;
  };

  goBack = () => {
    const { form, route, location } = this.props;

    const path = getPreviousPagePath(
      route.pageList,
      form.data,
      location.pathname,
    );

    if (typeof route.pageConfig.onNavBack === 'function') {
      route.pageConfig.onNavBack({
        formData: form.data,
        goPath: customPath => this.props.router.push(customPath),
        goPreviousPath: urlParams => {
          const urlParamsString = stringifyUrlParams(urlParams);
          this.props.router.push(path + (urlParamsString || ''));
        },
        pageList: route.pageList,
        pathname: location.pathname,
        setFormData: this.props.setData,
        urlParams: location.query,
      });
      return;
    }

    this.props.router.push(path);
  };

  goToPath = (customPath, options = {}) => {
    const {
      form,
      route: { pageList },
      location,
    } = this.props;
    const { force } = options;

    const path =
      customPath &&
      (force || checkValidPagePath(pageList, this.props.form.data, customPath))
        ? customPath
        : getPreviousPagePath(pageList, form.data, location.pathname);

    this.props.router.push(path);
  };

  onContinue = () => {
    const { route } = this.props;
    if (typeof route.pageConfig.onContinue === 'function') {
      // pass in data & set form data function to allow modifying data or
      // flags upon leaving a page
      route.pageConfig.onContinue(this.formData(), this.props.setData);
    }
  };

  render() {
    const {
      route,
      params,
      form,
      contentBeforeButtons,
      contentAfterButtons,
      formContext,
      appStateData,
    } = this.props;

    const pageProps = form.pages[route.pageConfig.pageKey];
    let { schema, uiSchema } = pageProps;

    const pageClasses = classNames('form-panel', route.pageConfig.pageClass);
    const data = this.formData();

    if (
      route.pageConfig.showPagePerItem &&
      (!route.pageConfig.CustomPage ||
        route.pageConfig.customPageUsesPagePerItemData)
    ) {
      // Instead of passing through the schema/uiSchema to SchemaForm, the
      // current item schema for the array at arrayPath is pulled out of the page state and passed
      const { items, additionalItems } = schema.properties[
        route.pageConfig.arrayPath
      ];
      schema = items[params.index];
      if (!schema && route.pageConfig.allowPathWithNoItems) {
        schema = additionalItems;
      }
      // Similarly, the items uiSchema and the data for just that particular item are passed
      uiSchema = uiSchema[route.pageConfig.arrayPath].items;
    }
    // It should be "safe" to check that this is the first page because it is
    // always eligible and enabled, no need to call getPreviousPagePath.
    const isFirstRoutePage =
      route.pageList[0].path === this.props.location.pathname;

    const showNavLinks =
      environment.isLocalhost() && route.formConfig?.dev?.showNavLinks;
    const hideNavButtons =
      !environment.isProduction() &&
      (route.formConfig?.formOptions?.noBottomNav ||
        route.pageConfig?.hideNavButtons);

    let pageContentBeforeButtons = route.pageConfig?.ContentBeforeButtons;
    if (
      route.pageConfig?.ContentBeforeButtons &&
      isReactComponent(route.pageConfig.ContentBeforeButtons)
    ) {
      pageContentBeforeButtons = (
        <route.pageConfig.ContentBeforeButtons
          formData={data}
          formContext={formContext}
          router={this.props.router}
          setFormData={this.props.setData}
        />
      );
    }
    const NavButtons = route.formConfig?.useTopBackLink
      ? FormNavButtonContinue
      : FormNavButtons;

    const {
      contentBeforeNavButtons,
      contentAfterNavButtons,
    } = getContentBeforeAndAfterButtons(
      route,
      contentBeforeButtons,
      contentAfterButtons,
    );

    // Bypass the SchemaForm and render the custom component
    // NOTE: I don't think FormPage is rendered on the review page, so I believe
    // onReviewPage will always be false here
    if (isReactComponent(route.pageConfig.CustomPage)) {
      return (
        <div className={pageClasses}>
          {showNavLinks && (
            <DevModeNavLinks
              pageList={route.pageList}
              collapsible={route.formConfig?.dev?.collapsibleNavLinks}
            />
          )}
          <route.pageConfig.CustomPage
            name={route.pageConfig.pageKey}
            title={route.pageConfig.title}
            data={data}
            pagePerItemIndex={params ? params.index : undefined}
            onReviewPage={formContext?.onReviewPage}
            trackingPrefix={this.props.form.trackingPrefix}
            uploadFile={this.props.uploadFile}
            schema={schema}
            uiSchema={uiSchema}
            goBack={this.goBack}
            goForward={this.onSubmit}
            goToPath={this.goToPath}
            onContinue={this.onContinue}
            onChange={this.onChange}
            onSubmit={this.onSubmit}
            setFormData={this.props.setData}
            contentBeforeButtons={contentBeforeNavButtons}
            contentAfterButtons={contentAfterNavButtons}
            appStateData={appStateData}
            formContext={this.formContext}
            NavButtons={NavButtons}
          />
        </div>
      );
    }

    return (
      <div className={pageClasses}>
        {showNavLinks && (
          <DevModeNavLinks
            pageList={route.pageList}
            collapsible={route.formConfig?.dev?.collapsibleNavLinks}
          />
        )}
        <SchemaForm
          name={route.pageConfig.pageKey}
          title={route.pageConfig.title}
          data={data}
          appStateData={appStateData}
          schema={schema}
          uiSchema={uiSchema}
          pagePerItemIndex={params ? params.index : undefined}
          formContext={formContext}
          trackingPrefix={this.props.form.trackingPrefix}
          uploadFile={this.props.uploadFile}
          onChange={this.onChange}
          onSubmit={this.onSubmit}
        >
          {pageContentBeforeButtons}
          {hideNavButtons ? (
            <div />
          ) : (
            <>
              {contentBeforeNavButtons}
              <NavButtons
                goBack={!isFirstRoutePage && this.goBack}
                goForward={this.onContinue}
                submitToContinue
              />
              {contentAfterNavButtons}
            </>
          )}
        </SchemaForm>
      </div>
    );
  }
}

function mapStateToProps(state, ownProps) {
  const { appStateSelector } = ownProps.route.pageConfig;
  return {
    form: state.form,
    user: state.user,
    appStateData: appStateSelector && appStateSelector(state),
  };
}

const mapDispatchToProps = {
  setData,
  uploadFile,
};

FormPage.propTypes = {
  form: PropTypes.object.isRequired,
  appStateData: PropTypes.shape({}),
  blockScrollOnMount: PropTypes.bool,
  contentAfterButtons: PropTypes.element,
  contentBeforeButtons: PropTypes.element,
  formContext: PropTypes.shape({
    onReviewPage: PropTypes.bool,
  }),
  location: PropTypes.shape({
    pathname: PropTypes.string,
    query: PropTypes.object,
  }),
  params: PropTypes.shape({
    // for testing only?
    index: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
  }),
  route: PropTypes.shape({
    pageConfig: PropTypes.shape({
      allowPathWithNoItems: PropTypes.bool,
      arrayPath: PropTypes.string,
      ContentBeforeButtons: PropTypes.oneOfType([
        PropTypes.element,
        PropTypes.elementType,
        PropTypes.func,
      ]),
      CustomPage: PropTypes.oneOfType([
        PropTypes.element,
        PropTypes.elementType,
        PropTypes.func,
      ]),
      customPageUsesPagePerItemData: PropTypes.bool,
      hideNavButtons: PropTypes.bool,
      hideSaveLinkAndStatus: PropTypes.bool,
      onContinue: PropTypes.func,
      onNavBack: PropTypes.func,
      onNavForward: PropTypes.func,
      pageClass: PropTypes.string,
      pageKey: PropTypes.string.isRequired,
      schema: PropTypes.object.isRequired,
      scrollAndFocusTarget: PropTypes.oneOfType([
        PropTypes.string,
        PropTypes.func,
      ]),
      showPagePerItem: PropTypes.bool,
      title: PropTypes.oneOfType([PropTypes.string, PropTypes.func]),
      uiSchema: PropTypes.object.isRequired,
      updateFormData: PropTypes.func,
    }),
    formConfig: PropTypes.shape({
      dev: PropTypes.shape({
        showNavLinks: PropTypes.bool,
        collapsibleNavLinks: PropTypes.bool,
      }),
      formOptions: PropTypes.shape({
        noBottomNav: PropTypes.bool,
      }),
      showSaveLinkAfterButtons: PropTypes.bool,
      useTopBackLink: PropTypes.bool,
    }),
    pageList: PropTypes.arrayOf(
      PropTypes.shape({
        path: PropTypes.string.isRequired,
      }),
    ),
  }),
  router: PropTypes.shape({
    push: PropTypes.func,
  }),
  setData: PropTypes.func,
  uploadFile: PropTypes.func,
};

export default withRouter(
  connect(
    mapStateToProps,
    mapDispatchToProps,
  )(FormPage),
);

export { FormPage };