import { parsePublishedDocumentForCommunityRuleDisplay } from "./publishedDocumentToDisplaySections";
import { formatInviteCountWord } from "./parseInviteEmails";
import { RULE_SECTION_CATEGORY } from "./ruleSectionsFromMethodSelections";
import sharedTerms from "../../messages/en/create/sharedTerms.json";

const DESCRIPTION_MAX = 140;

/** Initials for the invite email disc when the group has no photo. */
export function communityInviteInitials(name: string): string {
  const words = name
    .trim()
    .split(/\s+/)
    .filter((word) => word.length > 0);
  if (words.length === 0) return "·";
  if (words.length === 1) {
    const word = words[0] ?? "";
    return word.slice(0, 2).toUpperCase();
  }
  const first = words[0]?.charAt(0) ?? "";
  const second = words[1]?.charAt(0) ?? "";
  return `${first}${second}`.toUpperCase();
}

/** Possessive for footer copy (`Share’s` / `Members’`). */
export function communityPossessive(name: string): string {
  const trimmed = name.trim();
  if (trimmed.length === 0) return "this community’s";
  if (/s$/i.test(trimmed)) return `${trimmed}’`;
  return `${trimmed}’s`;
}

/** Community description on the invite card, cut at 140 characters. */
export function clipCommunityInviteDescription(
  raw: string | null | undefined,
): string {
  const trimmed = typeof raw === "string" ? raw.trim() : "";
  if (trimmed.length <= DESCRIPTION_MAX) return trimmed;
  return trimmed.slice(0, DESCRIPTION_MAX).trimEnd();
}

/** Values vs method cards on a published Rule. Shared terms do not count. */
export function inviteRuleValueAndCardCounts(document: unknown): {
  values: number;
  cards: number;
} {
  const sections = parsePublishedDocumentForCommunityRuleDisplay(document);
  let values = 0;
  let cards = 0;
  for (const section of sections) {
    const n = section.entries.length;
    if (section.categoryName === RULE_SECTION_CATEGORY.values) {
      values += n;
    } else if (section.categoryName !== sharedTerms.sectionTitle) {
      cards += n;
    }
  }
  return { values, cards };
}

/** Tag on the invite Rule card (`3 VALUES AND 6 CARDS`). Shared terms do not count. */
export function inviteRuleCountsLabel(document: unknown): string {
  const { values, cards } = inviteRuleValueAndCardCounts(document);
  const valuePart = values === 1 ? "1 VALUE" : `${values} VALUES`;
  const cardPart = cards === 1 ? "1 CARD" : `${cards} CARDS`;
  return `${valuePart} AND ${cardPart}`;
}

/** Spoken counts for Make a copy (`three values and six cards`). */
export function inviteRuleCountsSpoken(document: unknown): string {
  const { values, cards } = inviteRuleValueAndCardCounts(document);
  const valueNoun = values === 1 ? "value" : "values";
  const cardNoun = cards === 1 ? "card" : "cards";
  return `${formatInviteCountWord(values)} ${valueNoun} and ${formatInviteCountWord(cards)} ${cardNoun}`;
}