import { revalidatePath, revalidateTag } from "next/cache";
import { NextRequest, NextResponse } from "next/server";

type RevalidateBody = {
  /** Revalidate a fetch cache tag (portfolios, blogs, portfolio:slug, blog:slug, …). */
  tag?: string;
  /** Revalidate a path (/projects/foo, /, …). */
  path?: string;
  /** Shorthand: portfolios | blogs | all */
  scope?: "portfolios" | "blogs" | "all";
};

/**
 * On-demand cache purge — call after CMS publish/update.
 *
 * POST /api/revalidate
 * Header: x-revalidate-secret: <REVALIDATE_SECRET>
 * Body (JSON, optional): { "scope": "all" } | { "tag": "portfolios" } | { "path": "/projects/item" }
 *
 * nginx may still serve cached HTML for up to its TTL (5m) unless purged separately.
 */
export async function POST(req: NextRequest) {
  const secret = process.env.REVALIDATE_SECRET;
  if (!secret) {
    return NextResponse.json({ ok: false, error: "REVALIDATE_SECRET not configured" }, { status: 503 });
  }

  const provided =
    req.headers.get("x-revalidate-secret") ?? req.nextUrl.searchParams.get("secret");
  if (provided !== secret) {
    return NextResponse.json({ ok: false, error: "Unauthorized" }, { status: 401 });
  }

  let body: RevalidateBody = {};
  try {
    body = (await req.json()) as RevalidateBody;
  } catch {
    body = {};
  }

  const scope = body.scope ?? "all";
  const revalidated: string[] = [];

  if (body.tag) {
    revalidateTag(body.tag);
    revalidated.push(`tag:${body.tag}`);
  } else if (body.path) {
    revalidatePath(body.path);
    revalidated.push(`path:${body.path}`);
  } else if (scope === "portfolios" || scope === "all") {
    revalidateTag("portfolios");
    revalidatePath("/");
    revalidatePath("/projects");
    revalidatePath("/aboutus");
    revalidatePath("/atelier");
    revalidatePath("/raoofi-home");
    revalidated.push("scope:portfolios");
  }

  if (scope === "blogs" || scope === "all") {
    revalidateTag("blogs");
    revalidateTag("blogs:news");
    revalidatePath("/news");
    revalidatePath("/blog");
    revalidatePath("/news-and-blog");
    revalidated.push("scope:blogs");
  }

  return NextResponse.json({ ok: true, revalidated, at: new Date().toISOString() });
}