/**
 * SQL query input field, which consists of a CodeMirror SQL editor with autocompletion
 * (for node names and columns) and syntax highlighting.
 */
import React from 'react';
import { ErrorMessage, Field, useFormikContext } from 'formik';
import CodeMirror from '@uiw/react-codemirror';
import { langs } from '@uiw/codemirror-extensions-langs';

export const NodeQueryField = ({ djClient, value }) => {
  const [schema, setSchema] = React.useState([]);
  const formik = useFormikContext();
  const sqlExt = langs.sql({ schema: schema });

  const initialAutocomplete = async context => {
    // Based on the parsed prefix, we load node names with that prefix
    // into the autocomplete schema. At this stage we don't load the columns
    // to save on unnecessary calls
    const word = context.matchBefore(/[\.\w]*/);
    const matches = await djClient.nodes(word.text);
    matches.forEach(nodeName => {
      if (schema[nodeName] === undefined) {
        schema[nodeName] = [];
        setSchema(schema);
      }
    });
  };

  const updateFormik = val => {
    formik.setFieldValue('query', val);
  };

  const updateAutocomplete = async (value, _) => {
    // If a particular node has been chosen, load the columns of that node into
    // the autocomplete schema for column-level autocompletion
    for (var nodeName in schema) {
      if (
        value.includes(nodeName) &&
        (!schema.hasOwnProperty(nodeName) ||
          (schema.hasOwnProperty(nodeName) && schema[nodeName].length === 0))
      ) {
        const nodeDetails = await djClient.node(nodeName);
        schema[nodeName] = nodeDetails.columns.map(col => col.name);
        setSchema(schema);
      }
    }
  };

  return (
    <div className="QueryInput NodeCreationInput">
      <ErrorMessage name="query" component="span" />
      <label htmlFor="Query">Query *</label>
      <Field
        type="textarea"
        style={{ display: 'none' }}
        as="textarea"
        name="query"
        id="Query"
      />
      <div role="button" tabIndex={0} className="relative flex bg-[#282a36]">
        <CodeMirror
          id={'query'}
          name={'query'}
          extensions={[
            sqlExt,
            sqlExt.language.data.of({
              autocomplete: initialAutocomplete,
            }),
          ]}
          value={value}
          placeholder={
            'SELECT\n\tprimary_key,\n\tmeasure1,\n\tmeasure2,\n\tforeign_key_for_dimension1,\n\tforeign_key_for_dimension2\nFROM source.source_node\nWHERE ...'
          }
          options={{
            theme: 'default',
            lineNumbers: true,
          }}
          width="100%"
          height="400px"
          style={{
            margin: '0 0 23px 0',
            flex: 1,
            fontSize: '150%',
            textAlign: 'left',
          }}
          onChange={(value, viewUpdate) => {
            updateFormik(value);
            updateAutocomplete(value, viewUpdate);
          }}
        />
      </div>
    </div>
  );
};