// Contacts the check correctly does not flag, with the rule that explains it. Computed, never hand-listed.
import { channelOf, expectedInquiries, horizon, isQualifyingReply } from "./check";
import type { CheckConfig, IsoDate, Snapshot } from "./types";

export type NotFlagged =
  | { kind: "other_form"; contactId: string; at: IsoDate; since: IsoDate }
  | { kind: "added_without_inquiry"; contactId: string; at: IsoDate; source: string }
  | { kind: "returning_client_answered"; contactId: string; at: IsoDate; since: IsoDate; minutes: number }
  | { kind: "answered_by_call"; contactId: string; at: IsoDate };

const DAY = 86_400_000;
const t = (d: IsoDate) => new Date(d).getTime();

export function notFlagged(s: Snapshot, cfg: CheckConfig, now: IsoDate): NotFlagged[] {
  const limit = horizon(s, now);
  const out: NotFlagged[] = [];
  const inquiries = expectedInquiries(s, cfg);
  const inquiryContacts = new Set(inquiries.map((x) => x.submission.contactId));
  for (const c of s.contacts) {
    if (inquiryContacts.has(c.id)) continue;
    const other = s.submissions.find((x) => x.contactId === c.id && t(x.createdAt) > t(limit) - DAY && t(x.createdAt) <= t(limit));
    if (other) out.push({ kind: "other_form", contactId: c.id, at: other.createdAt, since: c.dateAdded });
    else if (t(c.dateAdded) > t(limit) - DAY && t(c.dateAdded) <= t(limit))
      out.push({ kind: "added_without_inquiry", contactId: c.id, at: c.dateAdded, source: c.source ?? "" });
  }
  for (const { submission, contact } of inquiries) {
    if (!contact || t(submission.createdAt) > t(limit)) continue;
    const reply = s.messages
      .filter((m) => t(m.dateAdded) <= t(limit) && isQualifyingReply(m, contact, submission.createdAt, cfg))
      .sort((a, b) => t(a.dateAdded) - t(b.dateAdded))[0];
    if (!reply) continue;
    if (channelOf(reply) === "Call") out.push({ kind: "answered_by_call", contactId: contact.id, at: reply.dateAdded });
    else if (t(contact.dateAdded) < t(submission.createdAt) - 30 * DAY)
      out.push({
        kind: "returning_client_answered", contactId: contact.id, at: submission.createdAt, since: contact.dateAdded,
        minutes: Math.max(1, Math.round((t(reply.dateAdded) - t(submission.createdAt)) / 60000)),
      });
  }
  return out;
}