"use client";

import { Button } from "../ui/button";
import { cn } from "../../src/lib/utils";
import { CheckIcon, CopyIcon } from "lucide-react";
import {
  type ComponentProps,
  createContext,
  type HTMLAttributes,
  useContext,
  useState,
} from "react";

type CodeBlockProps = HTMLAttributes<HTMLDivElement> & {
  code: string;
  language?: string;
  showLineNumbers?: boolean;
};

type CodeBlockContextType = {
  code: string;
};

const CodeBlockContext = createContext<CodeBlockContextType>({
  code: "",
});

export const CodeBlock = ({
  code,
  language,
  showLineNumbers = false,
  className,
  children,
  ...props
}: CodeBlockProps) => {
  const lines = code.split("\n");

  return (
    <CodeBlockContext.Provider value={{ code }}>
      <div
        className={cn(
          "group relative w-full overflow-hidden rounded-md border bg-background text-foreground",
          className
        )}
        {...props}
      >
        <div className="relative">
          <div className="overflow-x-auto">
            <table className="w-full border-collapse">
              <tbody>
                {lines.map((line, i) => (
                  <tr key={i} className="border-0">
                    {showLineNumbers && (
                      <td className="w-10 select-none pr-4 text-right align-top text-muted-foreground text-xs">
                        {i + 1}
                      </td>
                    )}
                    <td className="p-0">
                      <pre className="m-0 p-0 text-sm whitespace-pre font-mono">
                        <code className="text-sm">{line || "\u00A0"}</code>
                      </pre>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
          {children && (
            <div className="absolute top-2 right-2 flex items-center gap-2">
              {children}
            </div>
          )}
        </div>
      </div>
    </CodeBlockContext.Provider>
  );
};

export type CodeBlockCopyButtonProps = ComponentProps<typeof Button> & {
  onCopy?: () => void;
  onError?: (error: Error) => void;
  timeout?: number;
};

export const CodeBlockCopyButton = ({
  onCopy,
  onError,
  timeout = 2000,
  children,
  className,
  ...props
}: CodeBlockCopyButtonProps) => {
  const [isCopied, setIsCopied] = useState(false);
  const { code } = useContext(CodeBlockContext);

  const copyToClipboard = async () => {
    if (typeof window === "undefined" || !navigator?.clipboard?.writeText) {
      onError?.(new Error("Clipboard API not available"));
      return;
    }

    try {
      await navigator.clipboard.writeText(code);
      setIsCopied(true);
      onCopy?.();
      setTimeout(() => setIsCopied(false), timeout);
    } catch (error) {
      onError?.(error as Error);
    }
  };

  const Icon = isCopied ? CheckIcon : CopyIcon;

  return (
    <Button
      className={cn("shrink-0", className)}
      onClick={copyToClipboard}
      size="icon"
      variant="ghost"
      {...props}
    >
      {children ?? <Icon size={14} />}
    </Button>
  );
};