import {
  EmbedBuilder,
  PermissionsBitField,
  SlashCommandBuilder,
  ActionRowBuilder,
  ButtonBuilder,
  ButtonStyle,
} from "discord.js";
import fs from "fs/promises";

export default {
  name: "addauthor",
  description: "Fügt alle Plugins eines SpigotMC-Autors zur Beobachtungsliste hinzu",
  aliases: ["addall"],
  guild: ["all"],
  nsfw: false,
  user_permissions: [PermissionsBitField.Flags.Administrator],
  bot_permissions: [],
  args_required: 2,
  args_usage: "[author_id] [#kanal]  Beispiel: vn!addauthor 618600 #plugin-updates",
  cooldown: 10,

  data: new SlashCommandBuilder()
    .setName("addauthor")
    .setDescription("Fügt alle Plugins eines SpigotMC-Autors zur Beobachtungsliste hinzu")
    .addStringOption((opt) =>
      opt
        .setName("author_id")
        .setDescription("SpigotMC Autor-ID (aus der Profil-URL)")
        .setRequired(true)
    )
    .addChannelOption((opt) =>
      opt
        .setName("kanal")
        .setDescription("Kanal für Update-Benachrichtigungen")
        .setRequired(true)
    ),

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

    const channel = ctx.isSlash
      ? ctx.interaction.options.getChannel("kanal")
      : ctx.mentions?.channels?.first();

    if (!channel) {
      return ctx.reply("Dieser Kanal ist ungültig. Bitte erwähne einen Kanal auf diesem Server.");
    }
    if (!ctx.guild.channels.cache.has(channel.id)) {
      return ctx.reply("Dieser Kanal befindet sich nicht auf diesem Server!");
    }

    // Fetch author info
    let authorName = authorID;
    try {
      const res = await fetch(`https://api.spiget.org/v2/authors/${authorID}`);
      if (res.ok) {
        const data = await res.json();
        authorName = data.name ?? authorID;
      }
    } catch { /* ignore */ }

    // Fetch all resources by author
    let resources;
    try {
      const res = await fetch(
        `https://api.spiget.org/v2/authors/${authorID}/resources?size=50&sort=-updateDate`
      );
      if (!res.ok) throw new Error(`HTTP ${res.status}`);
      resources = await res.json();
    } catch (e) {
      client.logger.error(e);
      return ctx.reply("Ressourcen konnten nicht von der Spiget-API abgerufen werden. Bitte versuche es erneut.");
    }

    if (!Array.isArray(resources) || resources.length === 0) {
      return ctx.reply(`Für Autor \`${authorID}\` wurden keine Ressourcen gefunden.`);
    }

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

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

    // Filter out already watched and check limit
    const alreadyWatched = resources.filter((r) =>
      saveData.watchedResources.some((w) => String(w.resourceID) === String(r.id))
    );
    const toAdd = resources.filter((r) =>
      !saveData.watchedResources.some((w) => String(w.resourceID) === String(r.id))
    );

    const willAdd   = toAdd;

    if (willAdd.length === 0 && alreadyWatched.length > 0) {
      return ctx.reply(
        `Alle ${alreadyWatched.length} Ressourcen von **${authorName}** werden bereits beobachtet.`
      );
    }

    if (willAdd.length === 0) {
      return ctx.reply("Es gibt keine neuen Ressourcen zum Hinzufügen.");
    }

    // Build confirmation embed
    const resourceList = willAdd
      .map((r) => `• **${r.name}** (\`${r.id}\`)`)
      .join("\n");

    const warnings = [];
    if (alreadyWatched.length > 0)
      warnings.push(`⚠️ ${alreadyWatched.length} bereits beobachtet (übersprungen)`);

    const confirmEmbed = new EmbedBuilder()
      .setColor(ctx.guild.members.me.displayHexColor)
      .setTitle(`📦 Alle Plugins von ${authorName} beobachten`)
      .setDescription(
        `Folgende **${willAdd.length}** Ressourcen werden in <#${channel.id}> beobachtet:\n\n${resourceList}` +
        (warnings.length > 0 ? `\n\n${warnings.join("\n")}` : "")
      )
      .setFooter({ text: `Autor-ID: ${authorID} • SpigotMC` })
      .setTimestamp();

    const row = new ActionRowBuilder().addComponents(
      new ButtonBuilder()
        .setCustomId("addauthor_confirm")
        .setLabel(`✅ Alle ${willAdd.length} hinzufügen`)
        .setStyle(ButtonStyle.Success),
      new ButtonBuilder()
        .setCustomId("addauthor_cancel")
        .setLabel("❌ Abbrechen")
        .setStyle(ButtonStyle.Danger)
    );

    const confirmMsg = await ctx.reply({ embeds: [confirmEmbed], components: [row], fetchReply: true });

    // Wait for button click (30 seconds)
    let btnInteraction;
    try {
      btnInteraction = await confirmMsg.awaitMessageComponent({
        filter: (i) => i.user.id === ctx.author.id,
        time: 30_000,
      });
    } catch {
      const timeoutEmbed = EmbedBuilder.from(confirmEmbed)
        .setColor("#808080")
        .setDescription("⏱️ Zeit abgelaufen – Befehl wurde abgebrochen.");
      return confirmMsg.edit({ embeds: [timeoutEmbed], components: [] });
    }

    if (btnInteraction.customId === "addauthor_cancel") {
      const cancelEmbed = EmbedBuilder.from(confirmEmbed)
        .setColor("#FF0000")
        .setDescription("❌ Abgebrochen.");
      return btnInteraction.update({ embeds: [cancelEmbed], components: [] });
    }

    // Defer immediately – version fetching can take longer than 3 seconds
    await btnInteraction.deferUpdate();

    // Fetch latest versions and save
    const added   = [];
    const failed  = [];

    for (const resource of willAdd) {
      let latestVersion = "unbekannt";
      try {
        const res = await fetch(`https://api.spigotmc.org/legacy/update.php?resource=${resource.id}`);
        if (res.ok) latestVersion = (await res.text()).trim();
      } catch { /* ignore – speichern ohne Version */ }

      saveData.watchedResources.push({
        resourceID:         resource.id,
        resourceName:       resource.name,
        channelID:          channel.id,
        lastCheckedVersion: latestVersion,
      });

      added.push(`✅ **${resource.name}** (v${latestVersion})`);

      // Rate limiting
      await new Promise((r) => setTimeout(r, 300));
    }

    try {
      await fs.mkdir("./serverdata", { recursive: true });
      await fs.writeFile(filePath, JSON.stringify(saveData, null, 2));
    } catch (e) {
      client.logger.error(e);
      return btnInteraction.editReply({
        content: "Beim Speichern der Daten ist ein Fehler aufgetreten.",
        components: [],
      });
    }

    const successEmbed = new EmbedBuilder()
      .setColor("#00FF00")
      .setTitle(`✅ ${added.length} Plugins von ${authorName} werden jetzt beobachtet`)
      .setDescription(added.join("\n"))
      .addFields([
        { name: "📢 Kanal",   value: `<#${channel.id}>`,                             inline: true },
        { name: "📊 Gesamt",  value: `${saveData.watchedResources.length} beobachtet`, inline: true },
      ])
      .setFooter({ text: `Autor-ID: ${authorID}` })
      .setTimestamp();

    return btnInteraction.editReply({ embeds: [successEmbed], components: [] });
  },
};