import { useState, useEffect } from 'react';
import Editor, { OnMount } from '@monaco-editor/react';
import styles from './CodeEditor.module.css';

export interface CodeEditorProps {
  value: string;
  onChange: (value: string) => void;
  language?: string;
  rows?: number;
  error?: boolean;
}

function useMonacoTheme() {
  const [theme, setTheme] = useState(() =>
    document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light'
  );

  useEffect(() => {
    const observer = new MutationObserver(() => {
      setTheme(
        document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light'
      );
    });
    observer.observe(document.documentElement, {
      attributes: true,
      attributeFilter: ['data-theme'],
    });
    return () => observer.disconnect();
  }, []);

  return theme;
}

export function CodeEditor({
  value,
  onChange,
  language = 'javascript',
  rows = 6,
  error = false,
}: CodeEditorProps) {
  const theme = useMonacoTheme();
  const [focused, setFocused] = useState(false);
  const height = rows * 20 + 16;

  const handleMount: OnMount = (editor) => {
    editor.onDidFocusEditorWidget(() => setFocused(true));
    editor.onDidBlurEditorWidget(() => setFocused(false));
  };

  return (
    <div
      className={[
        styles.wrapper,
        focused ? styles.focused : '',
        error ? styles.hasError : '',
      ]
        .filter(Boolean)
        .join(' ')}
      style={{ height }}
    >
      <Editor
        height="100%"
        theme={theme}
        language={language}
        value={value}
        onChange={(v) => onChange(v ?? '')}
        onMount={handleMount}
        options={{
          minimap: { enabled: false },
          scrollBeyondLastLine: false,
          fontSize: 14,
          lineHeight: 20,
          wordWrap: 'on',
          padding: { top: 8, bottom: 8 },
          folding: false,
          renderLineHighlight: 'line',
          scrollbar: { vertical: 'auto', horizontal: 'hidden' },
          automaticLayout: true,
        }}
      />
    </div>
  );
}