/**
 * Default poll layout — vertical, nation-separated fields.
 * This is the standard layout and always the fallback.
 */

 import { EmbedBuilder } from "discord.js";
 import { PollState, VoteEntry, Nation } from "@types";
 import { WRankEntry } from "@systems/wrank";
 import { Config } from "@systems/config";
 import { WRank } from "@systems/wrank";
 import { Bringer } from "@systems/bringer";
 import { Emoji } from "@systems/emojis";
 import { format } from "@format";
 import { PollLayout, PollRowContext, PollEmbedOptions } from "@ui/types";
 import { Leaves } from "@systems/leaves";
 
 // ─── Row formatting ───────────────────────────────────────────────────────────
 
 function formatWRank(
   wRankEntry: WRankEntry | null,
   context: PollRowContext
 ): string {
   if (wRankEntry) {
     const goal = Config.get({ section: "wrank", key: "goal" });
     return format.wrank.full(wRankEntry, { goal, brackets: true });
   }
   if (!context.nationHasRank) return "";
   if (context.nationHasDelta) return format.wrank.noRank();
   return "—";
 }
 
 function formatRow(entry: VoteEntry, context: PollRowContext): string {
   const cfgFormat = Config.get({ section: "poll", key: "charDisplayFormat" });
   const nation    = entry.characterNation;
 
   const wRankEntry = entry.characterName && entry.characterNation
     ? WRank.entry(entry.characterName, entry.characterNation)
     : null;
 
   const wrank    = formatWRank(wRankEntry, context);
   const classStr = entry.characterClass
     ? (Emoji.class(entry.characterClass) || entry.characterClass)
     : "";
   const levelStr = entry.characterLevel ? `${entry.characterLevel}` : "";
 
   let row = cfgFormat
     .replace("{wrank}", wrank)
     .replace("{class}",  classStr)
     .replace("{level}",  levelStr)
     .replace("{name}",   entry.characterName ?? entry.displayName ?? "")
     .replace(/\s+/g, " ")
     .trim();
 
   if (nation && entry.userKey) {
     const bringer = Bringer.get({ nation });
     if (bringer && bringer === entry.characterName) {
       row += ` · ${format.bringer(nation)}`;
     }
   }

   if (entry.userKey && context.historyKey) {
    if (Leaves.hasLeft({ userKey: entry.userKey, historyKey: context.historyKey })) {
      row += ` ${Leaves.formatIndicator({ userKey: entry.userKey })}`;
    }
  }
 
   if (entry.borrowedFrom) row += ` ${Emoji.get("borrowed") || "🔗"}`;
   if (context.showNationEmoji && nation) row = `${Emoji.nation(nation)} ${row}`;
 
   return row;
 }
 
 function buildContext(
   entries: VoteEntry[],
   nation: Nation,
   options?: { showNationEmoji?: boolean; historyKey?: string }
 ): PollRowContext {
   const nationHasRank = entries.some((e) =>
     e.characterName && WRank.entry(e.characterName, nation) !== null
   );
   const nationHasDelta = entries.some((e) => {
     const wr = e.characterName ? WRank.entry(e.characterName, nation) : null;
     return wr?.previousRank !== undefined;
   });
   return {
    nationHasRank,
    nationHasDelta,
    showNationEmoji: options?.showNationEmoji ?? false,
    historyKey:      options?.historyKey,
  };
 }
 
 // ─── Embed building ───────────────────────────────────────────────────────────
 
 function formatNationField(
   nation: Nation,
   yesEntries: VoteEntry[],
   noVoters: VoteEntry[],
   showNoInline: boolean
 ): string {
   const context = buildContext(yesEntries, nation);
   const noEntries = showNoInline
     ? noVoters.filter((e) => e.characterNation === nation)
     : [];
   const lines = [
     ...yesEntries.map((e) => formatRow(e, context)),
     ...noEntries.map((e) => `❌ ${formatRow(e, context)}`),
   ];
   return lines.length > 0 ? lines.join("\n") : "—";
 }
 
 function formatMessages(
   allMessages: { entry: VoteEntry; voteType: "yes" | "no" }[]
 ): string {
   if (allMessages.length === 0) return "";
   return allMessages
     .map((m) => {
       const name   = m.entry.characterName ?? m.entry.displayName;
       const prefix = m.voteType === "no" ? "✗ " : "✓ ";
       const msg    = m.entry.publicMessage ? ` — ${m.entry.publicMessage}` : "";
       return `${prefix}${name} · ${m.entry.votedAt}${msg}`;
     })
     .join("\n");
 }
 
 function resolveColor(state: PollState): number {
   if (state.confirmed === "yes") return 0x57f287;
   if (state.confirmed === "no")  return 0xed4245;
   if (state.locked)              return 0x888888;
   return 0xe8a317;
 }
 
 function resolveTitle(
   state: PollState,
   yesByNation: Record<Nation, VoteEntry[]>
 ): string {
   const capellaEmoji = Emoji.get("capella");
   const procyonEmoji = Emoji.get("procyon");
   const counts = !state.locked && state.confirmed === null
     ? `  ${capellaEmoji} ${yesByNation[Nation.Capella].length}  ${procyonEmoji} ${yesByNation[Nation.Procyon].length}`
     : "";
   const statusSuffix =
     state.locked              ? " 🔒" :
     state.confirmed === "yes" ? " ✅" :
     state.confirmed === "no"  ? " ❌" : "";
   return `⚔️ TG — ${state.slot}:00${counts}${statusSuffix}`;
 }
 
 function resolveFooter(state: PollState, noCount: number, overrideLockMsg?: string): string {
   if (state.confirmed === "yes") return Config.get({ section: "poll", key: "confirmYes" });
   if (state.confirmed === "no")  return Config.get({ section: "poll", key: "confirmNo" });
   if (state.locked)              return overrideLockMsg ?? Config.get({ section: "poll", key: "lockMessage" });
   return `❌ ${noCount} • Vote updates live • Anyone can vote • /tg switch to change character`;
 }
 
 function buildEmbed(state: PollState, options?: PollEmbedOptions): EmbedBuilder {
   const yesByNation: Record<Nation, VoteEntry[]> = {
     [Nation.Capella]: [],
     [Nation.Procyon]: [],
   };
   const noVoters:    VoteEntry[] = [];
   const allMessages: { entry: VoteEntry; voteType: "yes" | "no" }[] = [];
   const showNoInline = Config.get({ section: "poll", key: "showNoInNationField" });
 
   for (const entry of state.yes.values()) {
     const nation = entry.characterNation ?? Nation.Capella;
     yesByNation[nation].push(entry);
     allMessages.push({ entry, voteType: "yes" });
   }
   for (const entry of state.no.values()) {
     noVoters.push(entry);
     allMessages.push({ entry, voteType: "no" });
   }
 
   const capellaEmoji = Emoji.get("capella");
   const procyonEmoji = Emoji.get("procyon");
 
   const embed = new EmbedBuilder()
     .setTitle(resolveTitle(state, yesByNation))
     .setColor(resolveColor(state))
     .addFields(
       {
         name:   `${capellaEmoji} Capella (${yesByNation[Nation.Capella].length})`,
         value:  formatNationField(Nation.Capella, yesByNation[Nation.Capella], noVoters, showNoInline),
         inline: false,
       },
       { name: "\u200b", value: "\u200b", inline: false },
       {
         name:   `${procyonEmoji} Procyon (${yesByNation[Nation.Procyon].length})`,
         value:  formatNationField(Nation.Procyon, yesByNation[Nation.Procyon], noVoters, showNoInline),
         inline: false,
       },
     )
     .setTimestamp();
 
   const msgSection = formatMessages(allMessages);
   if (msgSection) {
     embed.addFields({ name: "\u200b", value: msgSection, inline: false });
   }
 
   embed.setFooter({ text: resolveFooter(state, noVoters.length, options?.overrideLockMsg) });
   return embed;
 }
 
 // ─── Layout export ────────────────────────────────────────────────────────────
 
 export const defaultLayout: PollLayout = {
   name:        "default",
   description: "Standard vertical layout with nation-separated fields",
   buildEmbed,
   formatRow,
   buildContext,
 };