import { NextResponse } from "next/server";
import { requireSessionUser } from "@/lib/server/session";
import { getActiveGroupId, listGroups, setActiveGroupForUser } from "@/lib/server/groups";
import { toErrorResponse } from "@/lib/server/errors";
import { getRequestMeta } from "@/lib/server/request";

export async function GET() {
    const { requestId } = await getRequestMeta();
    try {
        const user = await requireSessionUser();
        const groups = await listGroups(user.id);
        const activeGroupId = await getActiveGroupId(user.id);
        const active = groups.find(group => Number(group.id) === activeGroupId) || null;
        return NextResponse.json({ requestId, active });
    } catch (e) {
        const { status, body } = toErrorResponse(e, "GET /api/groups/active", requestId);
        return NextResponse.json(body, { status });
    }
}

export async function POST(req: Request) {
    const { requestId } = await getRequestMeta();
    try {
        const user = await requireSessionUser();
        const body = await req.json().catch(() => null);
        const groupId = Number(body?.groupId || 0);
        if (!groupId) return NextResponse.json({ requestId, error: { code: "MISSING_GROUP_ID", message: "groupId is required" } }, { status: 400 });

        await setActiveGroupForUser(user.id, groupId);
        return NextResponse.json({ requestId, ok: true });
    } catch (e) {
        const { status, body } = toErrorResponse(e, "POST /api/groups/active", requestId);
        return NextResponse.json(body, { status });
    }
}