[WIP] Embedded method tree conversion

app/javascript/components/AeInlineMethods/index.jsx

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+/* eslint-disable jsx-a11y/no-static-element-interactions */
+/* eslint-disable jsx-a11y/click-events-have-key-events */
+import React, { useEffect, useState } from 'react';
+import PropTypes from 'prop-types';
+import { Modal, Button, ModalBody } from 'carbon-components-react';
+import MiqTree from '../MiqTreeView';
+
+/** Component to render a tree and to select an embedded method. */
+const AeInlineMethod = ({ type }) => {
+  const [data, setData] = useState({
+    isModalOpen: false,
+    selectedNode: undefined,
+    list: [],
+  });
+
+  /** Function to show/hide the modal. */
+  const showModal = (status) => {
+    setData({
+      ...data,
+      isModalOpen: status,
+    });
+  };
+
+  /** Function to render the Add method button. */
+  const renderAddButton = () => (
+    <Button
+      id="add-method"
+      kind="primary"
+      title={__('Add Method')}
+      onClick={() => showModal(true)}
+      size="sm"
+    >
+      {__('Add method')}
+    </Button>
+  );
+
+  console.log(data);
+
+  const renderList = () => (data.list.map((item) => (
+    <div key={item.key}>
+      <div>{item.fqname}</div>
+    </div>
+  )));
+
+  return (
+    <div>
+      {renderAddButton()}
+      {renderList()}
+      <Modal
+        primaryButtonDisabled={data.selectedNode === undefined}
+        size="lg"
+        modalHeading={__('Select item')}
+        open={data.isModalOpen}
+        primaryButtonText={__('OK')}
+        secondaryButtonText={__('Cancel')}
+        onRequestClose={() => showModal(false)}
+        onRequestSubmit={() => {
+          console.log('on onRequestSubmit');
+          setData({
+            ...data,
+            list: data.list.push(data.selectedNode),
+          });
+          showModal(false);
+        }}
+        onSecondarySubmit={() => {
+          console.log('on onSecondarySubmit');
+          showModal(false);
+        }}
+      >
+        <ModalBody>
+          {
+            data.isModalOpen
+              && (
+                <MiqTree
+                  type={type}
+                  onNodeSelect={(item) => {
+                    setData({
+                      ...data,
+                      selectedNode: item,
+                    });
+                  }}
+                />
+              )
+          }
+        </ModalBody>
+      </Modal>
+
+    </div>
+  );
+};
+
+export default AeInlineMethod;
+
+AeInlineMethod.propTypes = {
+  type: PropTypes.string.isRequired,
+};

app/javascript/components/MiqTreeView/MiqTreeChildNode.jsx

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+/* eslint-disable jsx-a11y/no-static-element-interactions */
+/* eslint-disable jsx-a11y/click-events-have-key-events */
+/* eslint-disable import/no-cycle */
+import React from 'react';
+import PropTypes from 'prop-types';
+import MiqTreeNode from './MiqTreeNode';
+
+/** A component to render the parent node of the tree. */
+const MiqTreeChildNode = ({
+  node, onSelect, selectedNode, selectKey,
+}) => (
+  <div className="tree-row child-tree intend-right" key={node.key}>
+    {
+      node.nodes.map((item) => (
+        <MiqTreeNode
+          key={item.key}
+          node={item}
+          selectedNode={selectedNode}
+          selectKey={selectKey}
+          onSelect={(childItem) => onSelect(childItem)}
+        />
+      ))
+    }
+  </div>
+);
+
+export default MiqTreeChildNode;
+
+MiqTreeChildNode.propTypes = {
+  node: PropTypes.shape({
+    key: PropTypes.string,
+    nodes: PropTypes.arrayOf(PropTypes.any),
+    state: PropTypes.shape({
+      expanded: PropTypes.bool,
+    }),
+  }).isRequired,
+  selectKey: PropTypes.string.isRequired,
+  onSelect: PropTypes.func.isRequired,
+  selectedNode: PropTypes.shape({
+    key: PropTypes.string,
+  }),
+};
+
+MiqTreeChildNode.defaultProps = {
+  selectedNode: undefined,
+};

app/javascript/components/MiqTreeView/MiqTreeNode.jsx

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+/* eslint-disable import/no-cycle */
+import React from 'react';
+import PropTypes from 'prop-types';
+import MiqTreeParentNode from './MiqTreeParentNode';
+import MiqTreeChildNode from './MiqTreeChildNode';
+
+/** A Recursive Functional component to render the Tree and its child nodes. */
+const MiqTreeNode = ({
+  node, selectedNode, selectKey, onSelect,
+}) => {
+  const isSelected = (selectedNode && selectedNode.key === node.key) || false;
+
+  return (
+    <div key={node.key}>
+      <MiqTreeParentNode
+        node={node}
+        isSelected={isSelected}
+        selectKey={selectKey}
+        onSelect={(parentItem) => onSelect(parentItem)}
+      />
+      {
+        node.state.expanded && node.nodes && node.nodes.length > 0 && (
+          <MiqTreeChildNode
+            node={node}
+            onSelect={(childItem) => onSelect(childItem)}
+            selectedNode={selectedNode}
+            selectKey={selectKey}
+          />
+        )
+      }
+    </div>
+  );
+};
+
+export default MiqTreeNode;
+
+MiqTreeNode.propTypes = {
+  node: PropTypes.shape({
+    key: PropTypes.string,
+    nodes: PropTypes.arrayOf(PropTypes.any),
+    state: PropTypes.shape({
+      expanded: PropTypes.bool,
+    }),
+  }).isRequired,
+  selectKey: PropTypes.string.isRequired,
+  onSelect: PropTypes.func.isRequired,
+  selectedNode: PropTypes.shape({
+    key: PropTypes.string,
+  }),
+};
+
+MiqTreeNode.defaultProps = {
+  selectedNode: undefined,
+};

app/javascript/components/MiqTreeView/MiqTreeParentNode.jsx

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+/* eslint-disable jsx-a11y/no-static-element-interactions */
+/* eslint-disable jsx-a11y/click-events-have-key-events */
+import React from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+import { CaretRight16, CaretDown16, CheckmarkFilled16 } from '@carbon/icons-react';
+import { selectableItem } from './helper';
+
+/** A component to render the parent node of the tree. */
+const MiqTreeParentNode = ({
+  node, selectKey, isSelected, onSelect,
+}) => {
+  /** Function to render the down and right caret. */
+  const renderCaret = (item) => {
+    if (!item) {
+      return undefined;
+    }
+    if (selectableItem(item, selectKey) || !item.lazyLoad) {
+      return undefined;
+    }
+    return item.state.expanded ? <CaretDown16 className="tree-caret" /> : <CaretRight16 className="tree-caret" />;
+  };
+
+  return (
+    <div className={classNames('tree-row parent-tree', isSelected && 'selected-node')} onClick={() => onSelect(node)}>
+      {renderCaret(node)}
+      <div className="tree-icon"><i className={node.icon} /></div>
+      <div className="tree-text">{node.text}</div>
+      {isSelected && <CheckmarkFilled16 className="selected-node-check" />}
+    </div>
+  );
+};
+
+export default MiqTreeParentNode;
+
+MiqTreeParentNode.propTypes = {
+  node: PropTypes.shape({
+    icon: PropTypes.string,
+    text: PropTypes.string,
+    key: PropTypes.string,
+    nodes: PropTypes.arrayOf(PropTypes.any),
+    state: PropTypes.shape({
+      expanded: PropTypes.bool,
+    }),
+  }).isRequired,
+  selectKey: PropTypes.string.isRequired,
+  isSelected: PropTypes.bool.isRequired,
+  onSelect: PropTypes.func.isRequired,
+};

app/javascript/components/MiqTreeView/helper.js

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+export const TREE_CONFIG = {
+  aeInlineMethod: {
+    url: '/tree/automate_inline_methods',
+    selectKey: 'aem',
+  },
+};
+
+/** Function to find the selected item from the tree data. */
+export const findNodeByKey = (array, keyToFind) => {
+  const flattenedArray = array.flatMap((item) => [item, ...(item.nodes || [])]);
+  const foundNode = flattenedArray.find((item) => item.key === keyToFind);
+
+  return foundNode || flattenedArray
+    .filter((item) => item.nodes && item.nodes.length > 0)
+    .map((item) => findNodeByKey(item.nodes, keyToFind))
+    .find(Boolean);
+};
+
+export const selectableItem = (child, selectKey) => child.key.split('-')[0] === selectKey;

app/javascript/components/MiqTreeView/index.jsx

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+import React, { useEffect, useState } from 'react';
+import PropTypes from 'prop-types';
+import { Loading } from 'carbon-components-react';
+import MiqTreeNode from './MiqTreeNode';
+import { TREE_CONFIG, selectableItem, findNodeByKey } from './helper';
+import './style.scss';
+
+const MiqTree = ({ type, onNodeSelect }) => {
+  const treeType = TREE_CONFIG[type];
+
+  const [data, setData] = useState({
+    list: undefined,
+    isLoading: true,
+    selectedNode: undefined,
+  });
+
+  /** Function to update the data. */
+  const updateData = (others) => {
+    setData({
+      ...data,
+      ...others,
+    });
+  };
+
+  /** A request is made to fetch the initial data during component load. */
+  useEffect(() => {
+    http.get(treeType.url)
+      .then((response) => updateData({ list: response, isLoading: false }));
+  }, []);
+
+  useEffect(() => {
+    onNodeSelect(data.selectedNode);
+  }, [data.selectedNode]);
+
+  /** Function to select a node from tree. This triggers the useEffect. */
+  const selectNode = (node) => {
+    const selectedNode = (data.selectedNode && data.selectedNode.key === node.key) ? undefined : node;
+    updateData({ selectedNode });
+  };
+
+  /** Function to handle show the children of a node
+   * if child nodes are available, just expand the tree.
+   * else, request an API to fetch the child nodes and update the results.
+   */
+  const expandTree = (item, node) => {
+    if (item.nodes && item.nodes.length > 0) {
+      item.state.expanded = true;
+      updateData({ list: [...data.list] });
+    } else {
+      http.get(`${treeType.url}?id=${node.key}`)
+        .then((response) => {
+          item.nodes = response;
+          item.state.expanded = true;
+          updateData({ list: [...data.list] });
+        });
+    }
+  };
+
+  /** Function to collapse the tree to hide the children */
+  const collapseTree = (item) => {
+    item.state.expanded = false;
+    updateData({ list: [...data.list] });
+  };
+
+  /** Function to expand/collapse the tree. */
+  const toggleTree = (node) => {
+    const item = findNodeByKey(data.list, node.key);
+    if (item) {
+      if (node.state.expanded) {
+        collapseTree(item);
+      } else {
+        expandTree(item, node);
+      }
+    }
+  };
+
+  /** Function to handle the click events of tree node. */
+  const loadSelectedNode = (node) => (selectableItem(node, treeType.selectKey)
+    ? selectNode(node)
+    : toggleTree(node));
+
+  /** Function to render the tree contents. */
+  const renderTree = (list) => (list && list.map((child) => (
+    <MiqTreeNode
+      key={child.key}
+      node={child}
+      selectedNode={data.selectedNode}
+      selectKey={treeType.selectKey}
+      onSelect={(node) => loadSelectedNode(node)}
+    />
+  )));
+
+  /** Function to render the modal contents. */
+  const renderTreeContent = () => ((data.list && data.list.length > 0) ? renderTree(data.list) : undefined);
+
+  return (
+    <div>
+      {
+        data.isLoading
+          ? <Loading active small withOverlay={false} className="loading" />
+          : renderTreeContent()
+      }
+    </div>
+  );
+};
+
+export default MiqTree;
+
+MiqTree.propTypes = {
+  type: PropTypes.string.isRequired,
+  onNodeSelect: PropTypes.func.isRequired,
+};