import { apiGet } from "@/lib/api/client";

export type OperationUsageItem = {
  operation: string;
  period: "day" | "month";
  used: number;
  limit: number;
  remaining: number;
  allowed: boolean;
};

export type OperationUsageStatus = {
  tier: "free" | "popular" | "premium";
  entitlement_status:
    | "free"
    | "trial"
    | "active"
    | "past_due"
    | "cancel_at_period_end"
    | "expired";
  usage_policy_key: string;
  items: OperationUsageItem[];
};

export function getOperationUsage() {
  return apiGet<OperationUsageStatus>("/users/me/operation-usage");
}

export function formatStudyChatUsage(item: OperationUsageItem | null) {
  if (!item) return null;
  return item.allowed
    ? `${item.remaining} AI questions remaining today`
    : "AI help limit reached · verified PYQ and correction still work";
}