// Author: Simon-Pierre Boucher
// Contact: contact@spboucher.ai
// Project: chat.spboucher.ai

import { NextResponse, type NextRequest } from "next/server";
import { requireSession } from "@/lib/auth/guard";
import {
  deleteConversation,
  getConversation,
  listMessages,
  getMessage,
  updateConversation,
} from "@/lib/conversations";

export const runtime = "nodejs";

type Params = { params: Promise<{ id: string }> };

export async function GET(_req: NextRequest, { params }: Params) {
  const { unauthorized } = await requireSession();
  if (unauthorized) return unauthorized;
  const { id } = await params;
  const conversation = getConversation(id);
  if (!conversation) return NextResponse.json({ error: "Conversation not found." }, { status: 404 });
  return NextResponse.json({ conversation, messages: listMessages(id) });
}

export async function PATCH(req: NextRequest, { params }: Params) {
  const { unauthorized } = await requireSession();
  if (unauthorized) return unauthorized;
  const { id } = await params;
  if (!getConversation(id)) return NextResponse.json({ error: "Conversation not found." }, { status: 404 });
  let body: { title?: string; pinned?: boolean; currentLeafId?: string | null };
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid request." }, { status: 400 });
  }
  if (body.currentLeafId) {
    const leaf = getMessage(body.currentLeafId);
    if (!leaf || leaf.conversation_id !== id) {
      return NextResponse.json({ error: "Invalid leaf message." }, { status: 400 });
    }
  }
  updateConversation(id, body);
  return NextResponse.json({ conversation: getConversation(id) });
}

export async function DELETE(_req: NextRequest, { params }: Params) {
  const { unauthorized } = await requireSession();
  if (unauthorized) return unauthorized;
  const { id } = await params;
  deleteConversation(id);
  return NextResponse.json({ ok: true });
}