import { EmbedBuilder, PermissionsBitField, SlashCommandBuilder } from "discord.js";
import fs from "fs/promises";
import { Spiget } from "spiget";
import {
  generateAvatarLink,
  generateAuthorURL,
  generateResourceIconURL,
  getLatestVersion,
  getUpdateDescription,
} from "../util/helpers.js";

const spiget = new Spiget("Viper-Network");

export default {
  name: "update",
  description: "Führt manuell einen Update-Check für eine bestimmte Ressource durch",
  aliases: [],
  guild: ["all"],
  nsfw: false,
  user_permissions: [PermissionsBitField.Flags.Administrator],
  bot_permissions: [],
  args_required: 1,
  args_usage: "[ressourcen_id]  Beispiel: vn!update 72678",
  cooldown: 10,

  data: new SlashCommandBuilder()
    .setName("update")
    .setDescription("Manueller Update-Check für eine Ressource")
    .addStringOption((opt) =>
      opt.setName("ressourcen_id").setDescription("Spiget Ressourcen-ID").setRequired(true)
    ),

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

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

    // Load server data
    let saveData;
    try {
      const raw = await fs.readFile(filePath, "utf8");
      saveData = JSON.parse(raw);
    } catch {
      return ctx.reply("Dieser Server hat keine beobachteten Ressourcen.");
    }

    const watched = saveData.watchedResources.find(
      (r) => String(r.resourceID) === String(resourceID)
    );

    if (!watched) {
      return ctx.reply(
        `Ressource \`${resourceID}\` wird auf diesem Server nicht beobachtet. Füge sie zuerst mit \`${client.config.prefix}add\` hinzu.`
      );
    }

    // Fetch resource info
    let resource, author;
    try {
      resource = await spiget.getResource(resourceID);
      author   = await resource.getAuthor();
    } catch (e) {
      client.logger.error(e);
      return ctx.reply("Ressourcen-Informationen konnten nicht abgerufen werden.");
    }

    let latestVersion;
    try {
      latestVersion = await getLatestVersion(resourceID);
    } catch (e) {
      client.logger.error(e);
      return ctx.reply("Version konnte nicht abgerufen werden.");
    }

    const previousVersion = watched.lastCheckedVersion;
    const hasUpdate = previousVersion !== latestVersion;

    const authorURL       = generateAuthorURL(author.name, author.id);
    const authorAvatarURL = generateAvatarLink(author.id);
    const resourceIconURL = generateResourceIconURL(resource);
    const resourceURL     = `https://spigotmc.org/resources/.${resourceID}/`;

    if (!hasUpdate) {
      const upToDateEmbed = new EmbedBuilder()
        .setAuthor({ name: `Autor: ${author.name}`, iconURL: authorAvatarURL, url: authorURL })
        .setColor("#00FF00")
        .setTitle(`✅ ${resource.name} ist aktuell`)
        .setDescription(resource.tag)
        .addFields([
          { name: "Version", value: `**${latestVersion}**`, inline: true },
          { name: "Status",  value: "Kein Update verfügbar", inline: true },
        ])
        .setThumbnail(resourceIconURL)
        .setTimestamp();

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

    // Update available
    let updateDesc;
    try {
      updateDesc = await getUpdateDescription(resourceID);
    } catch {
      updateDesc = "Update-Beschreibung konnte nicht abgerufen werden.";
    }

    const updateEmbed = new EmbedBuilder()
      .setAuthor({ name: `Autor: ${author.name}`, iconURL: authorAvatarURL, url: authorURL })
      .setColor("#FFA500")
      .setTitle(`🔔 Update verfügbar: ${resource.name}`)
      .setDescription(resource.tag)
      .addFields([
        {
          name:  "📦 Version",
          value: `~~${previousVersion}~~ → **${latestVersion}**`,
          inline: false,
        },
        { name: "📝 Update-Beschreibung", value: updateDesc,  inline: false },
        { name: "⬇️ Download",            value: resourceURL, inline: false },
      ])
      .setThumbnail(resourceIconURL)
      .setTimestamp();

    // Update saved version
    watched.lastCheckedVersion = latestVersion;
    try {
      await fs.writeFile(filePath, JSON.stringify(saveData, null, 2));
    } catch (e) {
      client.logger.error(e);
    }

    // Also send to the watched channel if different from current
    const watchedChannel = ctx.guild.channels.cache.get(watched.channelID);
    if (watchedChannel && watchedChannel.id !== ctx.channel.id) {
      watchedChannel.send({ embeds: [updateEmbed] }).catch(client.logger.error);
    }

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