import React from 'react';
import { Check, Copy } from 'lucide-react';

interface CodeBlockProps {
    code: string;
    language?: string;
    filename?: string;
}

const CodeBlock: React.FC<CodeBlockProps> = ({ code, language = 'python', filename }) => {
    const [copied, setCopied] = React.useState(false);

    const handleCopy = () => {
        navigator.clipboard.writeText(code);
        setCopied(true);
        setTimeout(() => setCopied(false), 2000);
    };

    return (
        <div className="rounded-xl overflow-hidden bg-gray-900 border border-gray-800 shadow-2xl">
            {/* Header */}
            <div className="flex items-center justify-between px-4 py-2 bg-gray-800/50 border-b border-gray-800">
                <div className="flex items-center gap-2">
                    <div className="flex gap-1.5">
                        <div className="w-3 h-3 rounded-full bg-red-500/20 border border-red-500/50" />
                        <div className="w-3 h-3 rounded-full bg-yellow-500/20 border border-yellow-500/50" />
                        <div className="w-3 h-3 rounded-full bg-green-500/20 border border-green-500/50" />
                    </div>
                    {filename && (
                        <span className="ml-2 text-xs font-medium text-gray-400 font-mono">
                            {filename}
                        </span>
                    )}
                </div>
                <button
                    onClick={handleCopy}
                    className="p-1.5 rounded-lg text-gray-400 hover:text-white hover:bg-gray-700/50 transition-colors"
                    title="Copy code"
                >
                    {copied ? <Check className="w-4 h-4 text-green-400" /> : <Copy className="w-4 h-4" />}
                </button>
            </div>

            {/* Code */}
            <div className="p-4 overflow-x-auto">
                <pre className="font-mono text-sm leading-relaxed">
                    <code className={`language-${language}`}>
                        {code.split('\n').map((line, i) => (
                            <div key={i} className="table-row">
                                <span className="table-cell text-right pr-4 select-none text-gray-700 w-8">
                                    {i + 1}
                                </span>
                                <span className="table-cell text-gray-300 whitespace-pre">
                                    {highlightSyntax(line)}
                                </span>
                            </div>
                        ))}
                    </code>
                </pre>
            </div>
        </div>
    );
};

// Simple syntax highlighting for Python/JSON
const highlightSyntax = (line: string) => {
    // Comments
    if (line.trim().startsWith('#') || line.trim().startsWith('//')) {
        return <span className="text-gray-500">{line}</span>;
    }

    // Strings
    const stringRegex = /(['"])(.*?)\1/g;
    const parts = line.split(stringRegex);

    if (parts.length > 1) {
        return (
            <>
                {parts.map((part, i) => {
                    // Every 3rd part is the quote, then content, then quote again
                    // This is a very naive implementation but works for simple marketing snippets
                    if (i % 3 === 1) return <span key={i} className="text-green-400">"{part}"</span>; // Content
                    if (i % 3 === 2) return null; // Closing quote (handled by regex split logic usually, but here we just color content)

                    // Keywords
                    return <React.Fragment key={i}>{highlightKeywords(part)}</React.Fragment>;
                })}
            </>
        );
    }

    return highlightKeywords(line);
};

const highlightKeywords = (text: string) => {
    const keywords = ['def', 'class', 'return', 'import', 'from', 'if', 'else', 'for', 'in', 'True', 'False', 'None'];
    const words = text.split(' ');

    return (
        <>
            {words.map((word, i) => {
                const isKeyword = keywords.includes(word.trim());
                const isFunction = word.includes('(');

                return (
                    <React.Fragment key={i}>
                        {isKeyword ? (
                            <span className="text-purple-400">{word}</span>
                        ) : isFunction ? (
                            <span className="text-blue-400">{word}</span>
                        ) : (
                            word
                        )}
                        {' '}
                    </React.Fragment>
                );
            })}
        </>
    );
};

export default CodeBlock;