import { assertCan, can, ServiceError, type ServiceCtx } from "@/server/services/context";
import { isLotseEnabled } from "../settings";

/**
 * Gate of the Lotse chat for technicians (lane L16): `lotse:use` + `field:execute`, Lotse module on
 * (TenantModule `lotse`) and the tenant switch „Lotse-Chat für Monteure" (TenantSettings.lotseChatEnabled,
 * default on). Switched off → `blocked` (reason disabled / chat_disabled).
 */

export async function isLotseChatEnabled(ctx: Pick<ServiceCtx, "db" | "tenantId">): Promise<boolean> {
  if (!(await isLotseEnabled(ctx))) return false;
  const s = await ctx.db.tenantSettings.findFirst({ select: { lotseChatEnabled: true } });
  return s?.lotseChatEnabled ?? true;
}

/** UI convenience: may the user open the chat at all (permissions + switches)? Never a security check. */
export async function canUseLotseChat(ctx: ServiceCtx): Promise<boolean> {
  return can(ctx, "lotse:use") && can(ctx, "field:execute") && (await isLotseChatEnabled(ctx));
}

export async function assertLotseChatUsable(ctx: ServiceCtx): Promise<void> {
  assertCan(ctx, "lotse:use");
  assertCan(ctx, "field:execute");
  if (!(await isLotseEnabled(ctx))) throw new ServiceError("blocked", "lotse disabled for tenant", { reason: "disabled" });
  const s = await ctx.db.tenantSettings.findFirst({ select: { lotseChatEnabled: true } });
  if (s && !s.lotseChatEnabled) throw new ServiceError("blocked", "lotse chat disabled for tenant", { reason: "chat_disabled" });
}