import { ChatInputCommandInteraction } from "discord.js";
import { Config } from "@systems/config";
import { hasOfficerRole } from "@systems/users";
import { getUsermapEntryById, setUsermapEntry, removeUsermapEntry } from "@systems/messages";
import { replyAndDelete } from "@utils";
import { Nations } from "@systems/nations";
import { polls, updatePollMessage } from "@systems/poll";
import { getEffectiveCharacter }    from "@systems/borrow";

export async function handleAdminUserMap(interaction: ChatInputCommandInteraction): Promise<void> {
  const member = await interaction.guild!.members.fetch(interaction.user.id);
  if (!hasOfficerRole(member, Config.get({ section: "roles", key: "officer" }))) {
    return void replyAndDelete(interaction, "❌ You don't have permission to use this command.");
  }

  const sub = interaction.options.getSubcommand();

  // ── map ──────────────────────────────────────────────────────────────────────
  if (sub === "map") {
    const target  = interaction.options.getUser("user", true);
    const userKey = interaction.options.getString("userkey", true);

    // Check if userKey exists in characters.json
    const fs   = require("fs");
    const path = require("path");
    const chars = JSON.parse(fs.readFileSync(path.join(__dirname, "../../../data/characters.json"), "utf8"));
    if (!chars[userKey]) {
      return void replyAndDelete(interaction, `❌ No characters found for userKey **${userKey}**. Make sure it exists in characters.json first.`, true);
    }

    // Check if this Discord ID is already mapped
    const existing = getUsermapEntryById(target.id, target.username);
    const entry = existing ?? { file: userKey, aliases: [target.globalName ?? target.username] };
    entry.file  = userKey;

    setUsermapEntry(target.id, entry);
    return void replyAndDelete(interaction, `✅ Mapped **${target.username}** (${target.id}) → **${userKey}**`, true);
  }

  // ── unmap ────────────────────────────────────────────────────────────────────
  if (sub === "unmap") {
    const target = interaction.options.getUser("user", true);
    const entry  = getUsermapEntryById(target.id, target.username);
    if (!entry) {
      return void replyAndDelete(interaction, `❌ No mapping found for **${target.username}**.`, true);
    }
    removeUsermapEntry(target.id);
    // Also remove old username-based entry if it exists
    removeUsermapEntry(target.username);
    return void replyAndDelete(interaction, `✅ Removed mapping for **${target.username}** (was → **${entry.file}**)`, true);
  }

  // ── list ─────────────────────────────────────────────────────────────────────
  if (sub === "list") {
    const fs   = require("fs");
    const path = require("path");
    const raw  = JSON.parse(fs.readFileSync(path.join(__dirname, "../../../data/usermap.json"), "utf8"));

    const lines: string[] = [];
    for (const [key, value] of Object.entries(raw)) {
      const file    = typeof value === "string" ? value : (value as any).file;
      const aliases = typeof value === "object" ? ((value as any).aliases ?? []) : [];
      const isId    = /^\d{17,20}$/.test(key);
      const type    = isId ? "🆔" : "👤";
      lines.push(`${type} \`${key}\` → **${file}**${aliases.length ? ` *(${aliases.join(", ")})*` : ""}`);
    }

    if (lines.length === 0) return void replyAndDelete(interaction, "No usermap entries found.", true);

    // Split into chunks to avoid Discord's 2000 char limit
    const chunks: string[] = [];
    let current = "";
    for (const line of lines) {
      if (current.length + line.length + 1 > 1900) {
        chunks.push(current);
        current = line;
      } else {
        current += (current ? "\n" : "") + line;
      }
    }
    if (current) chunks.push(current);

    await interaction.reply({ content: chunks[0], ephemeral: true });
    for (const chunk of chunks.slice(1)) {
      await interaction.followUp({ content: chunk, ephemeral: true });
    }
    return;
  }
}

export async function handleAdminPollFixVoter(interaction: ChatInputCommandInteraction): Promise<void> {
  const member = await interaction.guild!.members.fetch(interaction.user.id);
  if (!hasOfficerRole(member, Config.get({ section: "roles", key: "officer" }))) {
    return void replyAndDelete(interaction, "❌ You don't have permission to use this command.");
  }

  const target      = interaction.options.getUser("user", true);
  const targetMember = await interaction.guild!.members.fetch(target.id);
  const entry       = getUsermapEntryById(target.id, target.username);

  if (!entry) {
    return void replyAndDelete(interaction, `❌ **${target.username}** is not registered in usermap.json. Use \`/tg-admin user map\` first.`, true);
  }

  const slot  = [...polls.keys()][0];
  if (slot === undefined) return void replyAndDelete(interaction, "❌ No active poll.", true);

  const state = polls.get(slot)!;

  // Find voter entry by discord ID or by userKey
  let foundId: string | null = null;
  for (const [id, e] of [...state.yes.entries(), ...state.no.entries()]) {
    if ((e as any).discordId === target.id || e.userKey === entry.file) {
      foundId = id;
      break;
    }
  }

  if (!foundId) return void replyAndDelete(interaction, `❌ **${target.username}** has not voted in the active poll.`, true);

  const { char, borrowedFrom } = getEffectiveCharacter(entry.file);
  if (!char) return void replyAndDelete(interaction, `❌ No active character found for **${entry.file}**.`, true);

  const nation = Nations.resolve(targetMember, entry.file);

  const updateEntry = (map: Map<string, any>) => {
    const e = map.get(foundId!);
    if (e) {
      e.userKey         = entry.file;
      e.characterName   = char.name;
      e.characterClass  = char.class;
      e.characterLevel  = char.level;
      e.characterNation = char.nation ?? nation;
      e.borrowedFrom    = borrowedFrom ?? undefined;
      e.discordId       = target.id;
    }
  };
  updateEntry(state.yes);
  updateEntry(state.no);

  const channel = await interaction.client.channels.fetch(Config.get({ section: "channels", key: "poll" })) as any;
  await updatePollMessage(channel, slot);

  const { format } = require("@format");
  return void replyAndDelete(interaction, `✅ Fixed poll entry for **${target.username}** → ${format.char(char)}`, true);
}

export async function handleAdminPollShowEntry(interaction: ChatInputCommandInteraction): Promise<void> {
  const member = await interaction.guild!.members.fetch(interaction.user.id);
  if (!hasOfficerRole(member, Config.get({ section: "roles", key: "officer" }))) {
    return void replyAndDelete(interaction, "❌ You don't have permission to use this command.");
  }

  const target = interaction.options.getUser("user", true);
  const { polls } = require("@systems/poll");

  const slot  = [...polls.keys()][0];
  if (slot === undefined) return void replyAndDelete(interaction, "❌ No active poll.", true);

  const state = polls.get(slot)!;
  let found: any = null;

  for (const [id, e] of [...state.yes.entries(), ...state.no.entries()]) {
    if ((e as any).discordId === target.id || e.userKey === target.id) {
      found = { voteId: id, ...e };
      break;
    }
  }

  if (!found) return void replyAndDelete(interaction, `❌ No poll entry found for **${target.username}**.`, true);

  return void replyAndDelete(interaction, `\`\`\`json\n${JSON.stringify(found, null, 2)}\n\`\`\``, true);
}