import { EmbedBuilder, PermissionsBitField, SlashCommandBuilder } from "discord.js";
import fs from "fs/promises";
import { t } from "../util/i18n.js";

export default {
  name: "setlang",
  description: "Stellt die Sprache des Bots für diesen Server ein (DE/EN)",
  aliases: ["language", "lang"],
  guild: ["all"],
  nsfw: false,
  user_permissions: [PermissionsBitField.Flags.Administrator],
  bot_permissions: [],
  args_required: 1,
  args_usage: "[de|en]  Beispiel: vn!setlang en",
  cooldown: 5,

  data: new SlashCommandBuilder()
    .setName("setlang")
    .setDescription("Set the bot language for this server (DE/EN)")
    .addStringOption((opt) =>
      opt
        .setName("sprache")
        .setDescription("Sprache / Language")
        .setRequired(true)
        .addChoices(
          { name: "🇩🇪 Deutsch", value: "de" },
          { name: "🇬🇧 English", value: "en" }
        )
    ),

  async execute(client, ctx, args) {
    const input = ctx.isSlash
      ? ctx.interaction.options.getString("sprache")
      : args[0]?.toLowerCase();

    if (!["de", "en"].includes(input)) {
      return ctx.reply("Ungültige Sprache. Nutze `de` oder `en`.");
    }

    const guildID  = ctx.guild.id;
    const filePath = `./serverdata/${guildID}.json`;

    let saveData = { watchedResources: [] };
    try {
      const raw = await fs.readFile(filePath, "utf8");
      saveData = JSON.parse(raw);
    } catch { /* Datei noch nicht vorhanden */ }

    saveData.lang = input;

    try {
      await fs.mkdir("./serverdata", { recursive: true });
      await fs.writeFile(filePath, JSON.stringify(saveData, null, 2));
    } catch (e) {
      client.logger.error(e);
      return ctx.reply(t(input, "error.saveFailed"));
    }

    const flag   = input === "de" ? "🇩🇪" : "🇬🇧";
    const embed  = new EmbedBuilder()
      .setColor(ctx.guild.members.me.displayHexColor)
      .setTitle(t(input, "setlang.title"))
      .setDescription(`${flag} ${t(input, "setlang.success")}`);

    return ctx.reply({ embeds: [embed] });
  },
};