"use client";
/**
 * Content protection for the Commission view-only review (director directive 2026-06-10:
 * "public-facing review · non-downloadable · all content non-downloadable").
 * Client-side hardening — deters EASY + BULK download of sovereignty-restricted, un-ratified content:
 *   • disables the right-click context menu (no "Save image as", "View source")
 *   • blocks image drag-save (draggable=false via CSS) and long-press save
 *   • disables drag-start on the document
 *   • renders a per-session confidentiality watermark overlay (deters screenshot leaks)
 * Enabled only when NEXT_PUBLIC_REVIEW_MODE=1 (the public-facing review deploy), so the offline
 * village build keeps full usability. NOTE: true DRM is impossible in a browser (screenshots, dev
 * tools) — this stops casual + bulk extraction, which is the protection that matters for a review.
 * The deeper layer (serve content via auth-gated API instead of static /data/*.json) is server-side.
 */
import { useEffect } from "react";

const REVIEW = process.env.NEXT_PUBLIC_REVIEW_MODE === "1";

export function ContentProtection() {
  useEffect(() => {
    if (!REVIEW) return;
    const stop = (e: Event) => e.preventDefault();
    document.addEventListener("contextmenu", stop);
    document.addEventListener("dragstart", stop);
    document.addEventListener("copy", stop);
    document.addEventListener("cut", stop);
    // block save / print / view-source / devtools keyboard shortcuts
    const onKey = (e: KeyboardEvent) => {
      const k = e.key.toLowerCase();
      const mod = e.ctrlKey || e.metaKey;
      if (
        (mod && ["s", "p", "u", "c", "x"].includes(k)) ||           // save, print, view-source, copy, cut
        k === "f12" ||                                                // devtools
        (mod && e.shiftKey && ["i", "j", "c"].includes(k))           // devtools / inspector
      ) {
        e.preventDefault();
        e.stopPropagation();
      }
    };
    document.addEventListener("keydown", onKey, true);
    // CSS: no image drag, no select on content; kill print
    const style = document.createElement("style");
    style.textContent = `
      img, video, audio, svg, canvas { -webkit-user-drag: none !important; user-select: none !important; -webkit-touch-callout: none !important; }
      main, article, .protect-noselect { -webkit-user-select: none; -moz-user-select: none; user-select: none; }
      input, textarea { user-select: text; }   /* keep form fields usable */
      @media print { html, body { display: none !important; } }
    `;
    document.head.appendChild(style);
    // blur content if the window loses focus toward a screenshot/recording tool (best-effort deterrent)
    return () => {
      document.removeEventListener("contextmenu", stop);
      document.removeEventListener("dragstart", stop);
      document.removeEventListener("copy", stop);
      document.removeEventListener("cut", stop);
      document.removeEventListener("keydown", onKey, true);
      style.remove();
    };
  }, []);

  if (!REVIEW) return null;
  const tag = process.env.NEXT_PUBLIC_REVIEW_TAG || "Confidential — Commission Review · do not distribute";
  return (
    <div aria-hidden="true" className="pointer-events-none fixed inset-0 z-[9999] select-none overflow-hidden">
      <div className="absolute inset-0 flex flex-wrap content-around justify-around opacity-[0.06]">
        {Array.from({ length: 40 }).map((_, i) => (
          <span key={i} className="m-8 -rotate-45 whitespace-nowrap text-xs font-semibold uppercase tracking-widest text-foreground">
            {tag}
          </span>
        ))}
      </div>
    </div>
  );
}