/**
 * Leaderboard highlights — secondary embed with weekly standout stats.
 * Most kills, most deaths, next bringer per nation, etc.
 */

 import { EmbedBuilder } from "discord.js";
 import { Nation } from "@types";
 import { Emoji } from "@systems/emojis";
 import { Config } from "@systems/config";
 import { LeaderboardRow } from "./index";
 
 function topByKills(rows: LeaderboardRow[]): LeaderboardRow | null {
   return [...rows].sort((a, b) => b.totalKills - a.totalKills)[0] ?? null;
 }
 
 function topByDeaths(rows: LeaderboardRow[]): LeaderboardRow | null {
   return [...rows].sort((a, b) => b.totalDeaths - a.totalDeaths)[0] ?? null;
 }
 
 function nextBringerCandidate(rows: LeaderboardRow[], goal: number): LeaderboardRow | null {
   // Rank 1 with goal TGs met is eligible — pick the rank-1 player if they qualify
   const rank1 = rows.find((r) => r.position?.currentRank === 1);
   if (!rank1) return null;
   return rank1.tgCount >= goal ? rank1 : null;
 }
 
 export function buildHighlightsEmbed(allRows: LeaderboardRow[], weekKey: string): EmbedBuilder {
   const goal = Config.get({ section: "wrank", key: "goal" });
 
   const capellaRows = allRows.filter((r) => r.character.nation === Nation.Capella);
   const procyonRows = allRows.filter((r) => r.character.nation === Nation.Procyon);
 
   const topKillsCapella = topByKills(capellaRows);
   const topKillsProcyon = topByKills(procyonRows);
   const topDeathsAll    = topByDeaths(allRows);
 
   // Storm Bringer -> Procyon, Luminous Bringer -> Capella
   const nextLuminousBringer = nextBringerCandidate(capellaRows, goal); // Capella
   const nextStormBringer    = nextBringerCandidate(procyonRows, goal); // Procyon
 
   const capellaEmoji = Emoji.get("capella");
   const procyonEmoji = Emoji.get("procyon");
   const killEmoji     = Emoji.get("wrank_down_1") || "⚔️";
   const deathEmoji    = Emoji.get("wrank_up_1")   || "💀";
   const stormEmoji    = Emoji.get("storm_bringer")    || "⚡";
   const luminousEmoji = Emoji.get("luminous_bringer") || "🌟";
 
   const lines: string[] = [];
 
   if (topKillsCapella && topKillsCapella.totalKills > 0) {
     lines.push(`${killEmoji} Most Kills (${capellaEmoji}): **${topKillsCapella.character.name}** (${topKillsCapella.totalKills})`);
   }
   if (topKillsProcyon && topKillsProcyon.totalKills > 0) {
     lines.push(`${killEmoji} Most Kills (${procyonEmoji}): **${topKillsProcyon.character.name}** (${topKillsProcyon.totalKills})`);
   }
   if (topDeathsAll && topDeathsAll.totalDeaths > 0) {
     lines.push(`${deathEmoji} Most Deaths: **${topDeathsAll.character.name}** (${topDeathsAll.totalDeaths})`);
   }
 
   lines.push(""); // spacer
 
   lines.push(`${luminousEmoji} Next Luminous Bringer (${capellaEmoji}): ${nextLuminousBringer ? `**${nextLuminousBringer.character.name}**` : "—"}`);
   lines.push(`${stormEmoji} Next Storm Bringer (${procyonEmoji}): ${nextStormBringer ? `**${nextStormBringer.character.name}**` : "—"}`);
 
   return new EmbedBuilder()
     .setTitle("📊 Weekly Highlights")
     .setColor(0x5865f2)
     .setDescription(lines.join("\n"))
     .setFooter({ text: `Highlights · ${weekKey}` });
 }