'use client';

import { useState } from 'react';
import { CodeSnippet } from '@/lib/data';
import { Check, Copy, Download, FileCode, Terminal } from 'lucide-react';

interface CodeBlockProps {
  snippets: CodeSnippet[];
}

export function CodeBlock({ snippets }: CodeBlockProps) {
  const [activeTab, setActiveTab] = useState(0);
  const [copied, setCopied] = useState(false);

  if (!snippets || snippets.length === 0) return null;

  const currentSnippet = snippets[activeTab] || snippets[0];

  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(currentSnippet.code);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch (err) {
      console.error('Copy error:', err);
    }
  };

  const handleDownloadFile = () => {
    const element = document.createElement('a');
    const file = new Blob([currentSnippet.code], { type: 'text/plain;charset=utf-8' });
    element.href = URL.createObjectURL(file);
    element.download = currentSnippet.fileName.split('/').pop() || 'code.txt';
    document.body.appendChild(element);
    element.click();
    document.body.removeChild(element);
  };

  const lines = currentSnippet.code.split('\n');

  return (
    <div className="w-full rounded-2xl bg-slate-950 border border-slate-800 shadow-2xl overflow-hidden my-6">
      
      {/* Tab Navigation Header */}
      <div className="flex flex-wrap items-center justify-between bg-slate-900/90 px-4 py-2.5 border-b border-slate-800 gap-3">
        
        {/* File Tabs */}
        <div className="flex items-center gap-1.5 overflow-x-auto py-1 scrollbar-none">
          {snippets.map((snip, index) => (
            <button
              key={snip.fileName}
              onClick={() => setActiveTab(index)}
              className={`flex items-center gap-2 px-3.5 py-1.5 rounded-lg text-xs font-mono font-medium transition-all ${
                activeTab === index
                  ? 'bg-slate-800 text-white shadow-sm border border-slate-700/80'
                  : 'text-slate-400 hover:text-slate-200 hover:bg-slate-800/40'
              }`}
            >
              <FileCode className={`w-3.5 h-3.5 ${activeTab === index ? 'text-red-400' : 'text-slate-500'}`} />
              <span>{snip.fileName}</span>
            </button>
          ))}
        </div>

        {/* Action Buttons */}
        <div className="flex items-center gap-2">
          <button
            onClick={handleDownloadFile}
            className="flex items-center gap-1.5 px-3 py-1.5 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 text-xs font-semibold transition-colors border border-slate-700/60"
            title="Download File"
          >
            <Download className="w-3.5 h-3.5 text-slate-400" />
            <span className="hidden sm:inline">Download</span>
          </button>

          <button
            onClick={handleCopy}
            className={`flex items-center gap-1.5 px-3 py-1.5 rounded-lg text-xs font-semibold transition-all border ${
              copied
                ? 'bg-emerald-950/80 text-emerald-300 border-emerald-800/80'
                : 'bg-red-600 hover:bg-red-500 text-white border-red-500 shadow-sm shadow-red-600/20'
            }`}
          >
            {copied ? (
              <>
                <Check className="w-3.5 h-3.5 text-emerald-400" />
                <span>Copied!</span>
              </>
            ) : (
              <>
                <Copy className="w-3.5 h-3.5" />
                <span>Copy Code</span>
              </>
            )}
          </button>
        </div>

      </div>

      {/* Snippet Description bar */}
      {currentSnippet.description && (
        <div className="px-4 py-2 bg-slate-900/50 border-b border-slate-800/60 text-xs text-slate-400 font-sans flex items-center gap-2">
          <Terminal className="w-3.5 h-3.5 text-red-400 flex-shrink-0" />
          <span>{currentSnippet.description}</span>
        </div>
      )}

      {/* Code Display Area with Line Numbers */}
      <div className="p-4 overflow-x-auto font-mono text-xs leading-relaxed max-h-[480px] bg-slate-950">
        <table className="w-full border-collapse">
          <tbody>
            {lines.map((line, idx) => (
              <tr key={idx} className="hover:bg-slate-900/40 transition-colors group">
                <td className="w-10 select-none text-right pr-4 text-slate-600 group-hover:text-slate-500 font-mono text-[11px]">
                  {idx + 1}
                </td>
                <td className="whitespace-pre text-slate-200 pl-2">
                  {line}
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>

    </div>
  );
}