import { ClassKey, Nation } from "@src/types";
import { getClassEmoji, getNationEmoji, getEmoji } from "@systems/emojis";

// ─── Individual formatters ────────────────────────────────────────────────────

export interface CharDisplayOptions {
  emoji?: boolean;  // show class emoji (default: true)
  level?: boolean;  // show level (default: true)
}

/**
 * Format a character for display in embeds and messages.
 * Output: <:class:> 79 «Flash»
 */
function char(
  c: { class: ClassKey; level: number; name: string },
  options?: CharDisplayOptions
): string {
  const showEmoji = options?.emoji ?? true;
  const showLevel = options?.level ?? true;
  const classStr  = showEmoji ? (getClassEmoji(c.class) || c.class) : c.class;
  const levelStr  = showLevel ? `${c.level} ` : "";
  return `${classStr} ${levelStr}${c.name}`.trim();
}

/**
 * Format a nation name with its emoji.
 * Output: <:capella:> Capella
 */
function nation(n: Nation): string {
  const emoji = getNationEmoji(n);
  return emoji ? `${emoji} ${n}` : n;
}

/**
 * Format a score line.
 * Output: <:score:> 3000 <:kd:> 32/18
 */
function score(pts: number, k?: number, d?: number): string {
  const scoreEmoji = getEmoji("score") || "📊";
  const kdEmoji    = getEmoji("kd")    || "⚔️";
  const kdStr      = k !== undefined && d !== undefined ? ` ${kdEmoji} ${k}/${d}` : "";
  return `${scoreEmoji} ${pts}${kdStr}`;
}

/**
 * Parse a Discord custom emoji string to an object for ButtonBuilder.setEmoji()
 * Input: "<:fb:1511020923510194428>"
 * Output: { name: "fb", id: "1511020923510194428" }
 */
function emoji(emojiStr: string): { name: string; id: string } | string | null {
  if (!emojiStr) return null;
  const match = emojiStr.match(/^<:(\w+):(\d+)>$/);
  if (match) return { name: match[1], id: match[2] };
  return emojiStr;
}

// ─── Namespace export ─────────────────────────────────────────────────────────

export const format = {
  char,
  nation,
  score,
  emoji,
};