"use client";

import React, { useState } from "react";
import { Check, Copy, Terminal, Play } from "lucide-react";

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

export const CodeBlock: React.FC<CodeBlockProps> = ({ language, code }) => {
  const [copied, setCopied] = useState(false);
  const [output, setOutput] = useState<string | null>(null);
  const [isRunning, setIsRunning] = useState(false);

  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(code);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {
      // ignore
    }
  };

  const handleSimulateRun = () => {
    setIsRunning(true);
    setOutput(null);
    setTimeout(() => {
      setIsRunning(false);
      if (language === "python" || language === "py") {
        setOutput(">>> Process finished with exit code 0\n[Tensor shape: torch.Size([2, 64, 896]) | Latency: 4.2ms | Device: CUDA]");
      } else {
        setOutput("✓ Compiled successfully in 12ms. Zero runtime warnings.");
      }
    }, 600);
  };

  const lines = code.trim().split("\n");

  return (
    <div className="my-4 rounded-xl border border-white/[0.08] bg-[#070709] overflow-hidden shadow-2xl">
      {/* Code Header Bar */}
      <div className="flex items-center justify-between px-3.5 py-2 bg-white/[0.03] border-b border-white/[0.06] text-xs font-mono">
        <div className="flex items-center gap-2">
          <div className="flex gap-1.5">
            <div className="w-2.5 h-2.5 rounded-full bg-white/10" />
            <div className="w-2.5 h-2.5 rounded-full bg-white/10" />
            <div className="w-2.5 h-2.5 rounded-full bg-white/10" />
          </div>
          <span className="text-zinc-400 uppercase text-[11px] font-semibold tracking-wider ml-1">
            {language || "code"}
          </span>
        </div>

        <div className="flex items-center gap-2">
          <button
            onClick={handleSimulateRun}
            disabled={isRunning}
            className="flex items-center gap-1.5 px-2.5 py-1 rounded-md bg-white/[0.05] hover:bg-white/[0.1] text-zinc-300 hover:text-white transition-all text-[11px]"
            title="Simulate Code Execution"
          >
            <Play className={`w-3 h-3 text-emerald-400 ${isRunning ? "animate-spin" : ""}`} />
            <span>{isRunning ? "Running..." : "Run"}</span>
          </button>

          <button
            onClick={handleCopy}
            className="flex items-center gap-1.5 px-2.5 py-1 rounded-md bg-white/[0.05] hover:bg-white/[0.1] text-zinc-300 hover:text-white transition-all text-[11px]"
            title="Copy to clipboard"
          >
            {copied ? (
              <>
                <Check className="w-3 h-3 text-emerald-400" />
                <span className="text-emerald-400 font-medium">Copied</span>
              </>
            ) : (
              <>
                <Copy className="w-3 h-3 text-zinc-400" />
                <span>Copy</span>
              </>
            )}
          </button>
        </div>
      </div>

      {/* Code Content */}
      <div className="p-4 overflow-x-auto text-xs font-mono leading-relaxed bg-black/70">
        <table className="w-full border-collapse">
          <tbody>
            {lines.map((line, idx) => (
              <tr key={idx} className="hover:bg-white/[0.02]">
                <td className="w-8 select-none text-right pr-4 text-zinc-600 font-mono text-[11px]">
                  {idx + 1}
                </td>
                <td className="text-zinc-200 whitespace-pre">{line}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>

      {/* Simulated Execution Output Drawer */}
      {output && (
        <div className="border-t border-white/[0.08] bg-black/90 p-3 text-xs font-mono">
          <div className="flex items-center gap-1.5 text-zinc-500 text-[10px] uppercase tracking-wider mb-1">
            <Terminal className="w-3 h-3 text-emerald-400" />
            <span>Output Console</span>
          </div>
          <pre className="text-emerald-400/90 whitespace-pre-wrap leading-tight">{output}</pre>
        </div>
      )}
    </div>
  );
};