/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import {
  CompilerErrorDetail,
  CompilerDiagnostic,
} from 'babel-plugin-react-compiler';
import {useDeferredValue, useMemo, useState} from 'react';
import {useStore} from '../StoreContext';
import ConfigEditor from './ConfigEditor';
import Input from './Input';
import {CompilerOutput, default as Output} from './Output';
import {compile} from '../../lib/compilation';
import prettyFormat from 'pretty-format';

export default function Editor(): JSX.Element {
  const store = useStore();
  const deferredStore = useDeferredValue(store);
  const [compilerOutput, language, appliedOptions] = useMemo(
    () => compile(deferredStore.source, 'compiler', deferredStore.config),
    [deferredStore.source, deferredStore.config],
  );
  const [linterOutput] = useMemo(
    () => compile(deferredStore.source, 'linter', deferredStore.config),
    [deferredStore.source, deferredStore.config],
  );
  const [formattedAppliedConfig, setFormattedAppliedConfig] = useState('');

  let mergedOutput: CompilerOutput;
  let errors: Array<CompilerErrorDetail | CompilerDiagnostic>;
  if (compilerOutput.kind === 'ok') {
    errors = linterOutput.kind === 'ok' ? [] : linterOutput.error.details;
    mergedOutput = {
      ...compilerOutput,
      errors,
    };
  } else {
    mergedOutput = compilerOutput;
    errors = compilerOutput.error.details;
  }

  if (appliedOptions) {
    const formatted = prettyFormat(appliedOptions, {
      printFunctionName: false,
      printBasicPrototype: false,
    });
    if (formatted !== formattedAppliedConfig) {
      setFormattedAppliedConfig(formatted);
    }
  }

  return (
    <>
      <div className="relative flex top-14">
        <div className="flex-shrink-0">
          <ConfigEditor formattedAppliedConfig={formattedAppliedConfig} />
        </div>
        <div className="flex flex-1 min-w-0">
          <Input language={language} errors={errors} />
          <Output store={deferredStore} compilerOutput={mergedOutput} />
        </div>
      </div>
    </>
  );
}