import { ChatInputCommandInteraction, TextChannel, EmbedBuilder } from "discord.js";
import { cfg } from "@systems/config";
import { getCurrentWeek, getWeekKey, getBringer } from "@systems/wrank";
import { getEmoji } from "@systems/emojis";
import { replyAndDelete } from "@utils";

export async function handleRankPost(interaction: ChatInputCommandInteraction): Promise<void> {
  const week    = getCurrentWeek();
  const goal    = cfg("wRankGoal");
  const weekKey = getWeekKey();

  const formatNation = (nation: "capella" | "procyon"): string => {
    const entries = [...week.entries[nation]].sort((a, b) => a.currentRank - b.currentRank);
    if (entries.length === 0) return "—";

    const bringer = getBringer(nation === "capella" ? "Capella" : "Procyon");

    return entries.map((e) => {
      const isDone = e.tgCount >= goal;

      // ── Rank indicator ───────────────────────────────────────────────────
      // Use wrank_1_gold emoji if rank 1 and done, wrank_N emoji if available,
      // otherwise bold number as fallback (no colors in Discord plain text)
      const rankKey   = isDone ? `wrank_${e.currentRank}_gold` : `wrank_${e.currentRank}`;
      const rankEmoji = getEmoji(rankKey);
      const rankStr   = rankEmoji ?? (isDone ? `**${e.currentRank}**` : `${e.currentRank}`);
      

      // ── Delta ────────────────────────────────────────────────────────────
      // Use wrank_up_N / wrank_down_N emoji if available, text arrow as fallback
      const delta = e.previousRank !== undefined ? e.currentRank - e.previousRank : 0;
      let deltaStr = "";
      if (delta < 0) {
        const abs = Math.abs(delta);
        deltaStr = " " + (getEmoji(`wrank_up_${abs}`) ?? `↑${abs}`);
      } else if (delta > 0) {
        deltaStr = " " + (getEmoji(`wrank_down_${delta}`) ?? `↓${delta}`);
      }

      console.log(`rankKey: ${rankKey} rankEmoji: ${rankEmoji} rankStr: ${rankStr} isDone: ${isDone} delta: ${delta}`);

      // ── Bringer label ────────────────────────────────────────────────────
      const bringerStr = bringer === e.userKey && isDone
        ? ` · ${nation === "capella" ? "Luminous Bringer" : "Storm Bringer"}`
        : "";

      return `${rankStr}${deltaStr} «${e.characterName}» — ${e.weeklyPoints} pts (${e.tgCount}/${goal}${bringerStr})`;
    }).join("\n");
  };

  const embed = new EmbedBuilder()
    .setTitle(`⚔️ W.Rank Leaderboard — ${weekKey}`)
    .setColor(0xe8a317)
    .addFields(
      { name: "🔵 Capella", value: formatNation("capella"), inline: true },
      { name: "🔴 Procyon", value: formatNation("procyon"), inline: true },
    )
    .setTimestamp();

  const channelId = cfg("resultsChannelId") || cfg("pollChannelId");
  const channel   = await interaction.client.channels.fetch(channelId) as TextChannel;
  await channel.send({ embeds: [embed] });
  return void replyAndDelete(interaction, "✅ Leaderboard posted.");
}