"use client";
import { useEffect, useState } from "react";
import { highlight } from "sugar-high";
import { getFileContent } from "~/utils/git";

export type FileViewerProps = {
  path: string;
  gitRef: string;
};

export function FileViewer({ path, gitRef }: FileViewerProps) {
  const [content, setContent] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    let active = true;

    setLoading(true);
    setError(null);
    getFileContent({ data: { ref: gitRef, path } })
      .then((nextContent: string) => {
        if (!active) return;
        setContent(nextContent);
      })
      .catch((error: unknown) => {
        if (!active) return;
        setError(error instanceof Error && error.message ? error.message : "Failed to load file");
      })
      .finally(() => {
        if (active) {
          setLoading(false);
        }
      });

    return () => {
      active = false;
    };
  }, [path, gitRef]);

  if (loading) {
    return <div className="flex h-full items-center justify-center text-gray-600">Loading…</div>;
  }

  if (error) {
    return <div className="flex h-full items-center justify-center text-red-500">{error}</div>;
  }

  const isBinary = content !== null && content.includes("\x00");

  return (
    <div className="flex h-full flex-col">
      <div className="flex items-center gap-2 border-b border-gray-800 px-4 py-2 text-sm">
        <span className="font-mono text-gray-300">{path}</span>
        {content && <span className="text-xs text-gray-600">{content.split("\n").length} lines</span>}
      </div>
      <div className="flex-1 overflow-auto">
        {isBinary ? (
          <div className="flex h-full items-center justify-center text-gray-500">Binary file</div>
        ) : (
          <HighlightedCode code={content || ""} />
        )}
      </div>
    </div>
  );
}

function HighlightedCode({ code }: { code: string }) {
  const html = highlight(code);
  const lines = html.split("\n");

  return (
    <div className="sh-code overflow-auto font-mono text-sm">
      <table className="w-full border-collapse">
        <tbody>
          {lines.map((line, i) => (
            // oxlint-disable-next-line react/no-array-index-key -- source lines are static and never reordered; index is the line number
            <tr key={i} className="hover:bg-gray-900/50">
              <td className="sticky left-0 w-12 select-none bg-gray-950 pr-3 text-right text-xs text-gray-600">
                {i + 1}
              </td>
              <td
                className="whitespace-pre px-4 py-0"
                // oxlint-disable-next-line react/no-danger -- sugar-high returns trusted highlight markup
                dangerouslySetInnerHTML={{ __html: line || " " }}
              />
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}