/**
 * Pure survey eligibility helpers (client-safe: type-only payload-types import).
 * The list/detail pages use them server-side to mirror the enforced gates in
 * formBuilderConfig.ts, so users never see surveys they cannot submit.
 */
import type { Form } from "@/payload-types";

export interface SurveyAudienceContext {
  userId: number;
  roleIds: number[];
  qualificationNames: string[];
}

export function isSurveyOpen(
  form: Pick<Form, "activeFrom" | "activeUntil">,
  now: number,
): boolean {
  if (form.activeFrom && new Date(form.activeFrom).getTime() > now) return false;
  if (form.activeUntil && new Date(form.activeUntil).getTime() <= now) return false;
  return true;
}

function relationId(value: unknown): number | undefined {
  if (typeof value === "number") return value;
  if (typeof value === "object" && value !== null && "id" in value) {
    return (value as { id: number }).id;
  }
  return undefined;
}

function relationName(value: unknown): string | null {
  if (typeof value === "object" && value !== null && "name" in value) {
    return (value as { name: string }).name;
  }
  if (typeof value === "string") return value;
  return null;
}

export function surveyAudienceMatches(
  form: Pick<Form, "targeting">,
  ctx: SurveyAudienceContext,
): boolean {
  const targeting = form.targeting;
  const audience = targeting?.audience ?? "all";

  if (audience === "all") return true;

  if (audience === "users") {
    const ids = (targeting?.users ?? []).map(relationId).filter((v): v is number => v !== undefined);
    return ids.includes(ctx.userId);
  }

  if (audience === "roles") {
    const ids = (targeting?.roles ?? []).map(relationId).filter((v): v is number => v !== undefined);
    return ids.some((id) => ctx.roleIds.includes(id));
  }

  const names = (targeting?.qualifications ?? [])
    .map(relationName)
    .filter((n): n is string => n !== null)
    .map((n) => n.toLowerCase());
  if (names.length === 0) return false;
  return ctx.qualificationNames.some((qn) => names.includes(qn.toLowerCase()));
}