import { useState, useCallback, type HTMLAttributes, type ReactElement } from 'react'; import { Check, Copy, Hash, WrapText, AlignLeft } from 'lucide-react'; /** Extract the language from the nested
 element's className (e.g. "language-ts"). */
function extractLanguage(children: React.ReactNode): string | null {
  const codeEl = children as ReactElement<{ className?: string }> | undefined;
  const className = codeEl?.props?.className;
  if (typeof className !== 'string') return null;
  const match = className.match(/language-(\S+)/);
  return match ? match[1] : null;
}

/** Pretty-print common language identifiers. */
const LANGUAGE_LABELS: Record = {
  js: 'JavaScript',
  jsx: 'JSX',
  ts: 'TypeScript',
  tsx: 'TSX',
  py: 'Python',
  rb: 'Ruby',
  rs: 'Rust',
  go: 'Go',
  sh: 'Shell',
  bash: 'Bash',
  zsh: 'Zsh',
  yml: 'YAML',
  yaml: 'YAML',
  md: 'Markdown',
  json: 'JSON',
  html: 'HTML',
  css: 'CSS',
  sql: 'SQL',
  dockerfile: 'Dockerfile',
  toml: 'TOML',
};

function formatLanguage(lang: string): string {
  return LANGUAGE_LABELS[lang] || lang;
}

/**
 * Custom  renderer for ReactMarkdown.
 * Wraps code blocks with a language label and a floating copy button.
 */
const LINE_NUMBER_KEY = 'pinchchat-line-numbers';
const WRAP_KEY = 'pinchchat-code-wrap';
const LINE_THRESHOLD = 3; // Only show line numbers for blocks with more than this many lines

export function CodeBlock(props: HTMLAttributes) {
  const [copied, setCopied] = useState(false);
  const [showLineNumbers, setShowLineNumbers] = useState(() => {
    const stored = localStorage.getItem(LINE_NUMBER_KEY);
    return stored === null ? true : stored === 'true';
  });
  const [wordWrap, setWordWrap] = useState(() => {
    const stored = localStorage.getItem(WRAP_KEY);
    return stored === 'true';
  });
  const language = extractLanguage(props.children);

  const code = (props.children as ReactElement<{ children?: string }> | undefined)?.props?.children;
  const lines = typeof code === 'string' ? code.replace(/\n$/, '').split('\n') : [];
  const hasEnoughLines = lines.length > LINE_THRESHOLD;

  const handleCopy = useCallback(() => {
    if (typeof code === 'string') {
      navigator.clipboard.writeText(code).then(() => {
        setCopied(true);
        setTimeout(() => setCopied(false), 2000);
      });
    }
  }, [code]);

  const toggleLineNumbers = useCallback(() => {
    setShowLineNumbers(prev => {
      const next = !prev;
      localStorage.setItem(LINE_NUMBER_KEY, String(next));
      return next;
    });
  }, []);

  const toggleWrap = useCallback(() => {
    setWordWrap(prev => {
      const next = !prev;
      localStorage.setItem(WRAP_KEY, String(next));
      return next;
    });
  }, []);

  const shouldShowNumbers = showLineNumbers && hasEnoughLines;

  return (
    
      {language && (
        
          {formatLanguage(language)}
          
            
            {hasEnoughLines && (
              
            )}
          
        
      )}
      {shouldShowNumbers ? (
        
          
            {lines.map((_, i) => (
              {i + 1}
            ))}
          
                  
      ) : (
              )}
      
    
  );
}