// Narrative document save endpoint. The TipTap editor PUTs the current
// ProseMirror JSON here on debounce. Source of truth after the pivot.

import { NextResponse } from "next/server";
import { loadDocument, saveDocument } from "../../../../../lib/db/repo";

interface RouteContext {
  params: Promise<{ projectId: string }>;
}

export async function GET(_req: Request, ctx: RouteContext) {
  const { projectId } = await ctx.params;
  const doc = await loadDocument(projectId);
  if (!doc) return NextResponse.json({ doc: null, version: 0 });
  return NextResponse.json({ doc: doc.doc, version: doc.version, updatedAt: doc.updatedAt });
}

export async function PUT(req: Request, ctx: RouteContext) {
  const { projectId } = await ctx.params;
  let body: unknown;
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }
  if (!body || typeof body !== "object" || !("doc" in body)) {
    return NextResponse.json({ error: "Missing `doc` field" }, { status: 400 });
  }
  const stored = await saveDocument(projectId, (body as { doc: unknown }).doc);
  return NextResponse.json({ version: stored.version, updatedAt: stored.updatedAt });
}