import { ChatInputCommandInteraction, TextChannel, EmbedBuilder } from "discord.js";
import { cfg } from "../../systems/config";
import { getCurrentWeek, getWeekKey, getBringer } from "../../systems/wrank";
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;
      const delta     = e.previousRank !== undefined ? e.currentRank - e.previousRank : 0;
      const deltaStr  = delta < 0 ? ` ↑${Math.abs(delta)}` : delta > 0 ? ` ↓${delta}` : "";
      const bringerStr = bringer === e.userKey && isDone
        ? ` · ${nation === "capella" ? "Luminous Bringer" : "Storm Bringer"}`
        : "";
      return `${isDone ? "🟡" : "⬜"}${e.currentRank}${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.");
}