import { EmbedBuilder, SlashCommandBuilder } from "discord.js";
import fs from "fs";
import { t, getLang } from "../util/i18n.js";
import {
  generateAvatarLink,
  generateAuthorURL,
  generateResourceIconURL,
} from "../util/helpers.js";
import { Spiget } from "spiget";

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

export default {
  name: "check",
  description: "Prüft ob ein Plugin mit einer Minecraft-Version kompatibel ist",
  aliases: [],
  guild: ["all"],
  nsfw: false,
  user_permissions: [],
  bot_permissions: [],
  args_required: 1,
  args_usage: "[ressourcen_id] [mc-version]  Beispiel: vn!check 72678 1.21",
  cooldown: 5,

  data: new SlashCommandBuilder()
    .setName("check")
    .setDescription("Checks if a plugin is compatible with a Minecraft version")
    .addStringOption((opt) =>
      opt.setName("ressourcen_id").setDescription("Spiget Ressourcen-ID").setRequired(true)
    )
    .addStringOption((opt) =>
      opt
        .setName("mc_version")
        .setDescription("Minecraft-Version (z.B. 1.21)  – leer = aktuellste prüfen")
        .setRequired(false)
    ),

  async execute(client, ctx, args) {
    const guildID    = ctx.guild.id;
    const lang       = loadLang(guildID);
    const resourceID = ctx.isSlash
      ? ctx.interaction.options.getString("ressourcen_id")
      : args[0];
    const mcVersion  = ctx.isSlash
      ? (ctx.interaction.options.getString("mc_version") ?? null)
      : (args[1] ?? null);

    // Fetch resource details from Spiget
    let resource, author;
    try {
      resource = await spiget.getResource(resourceID);
      author   = await resource.getAuthor();
    } catch {
      return ctx.reply(t(lang, "error.invalidID", { id: resourceID }));
    }

    // Fetch full resource data for tested versions
    let data;
    try {
      const res = await fetch(`https://api.spiget.org/v2/resources/${resourceID}`);
      if (!res.ok) throw new Error();
      data = await res.json();
    } catch {
      return ctx.reply(t(lang, "error.apiDown"));
    }

    // testedVersions is a string like "1.8 - 1.21" or array
    const testedRaw = data.testedVersions ?? [];
    const tested    = Array.isArray(testedRaw)
      ? testedRaw
      : [testedRaw];

    // Supported versions from tags/description often contains "1.x"
    const supportedVersions = tested.length > 0
      ? tested.join(", ")
      : "Keine Angabe";

    // Determine compatibility for requested version
    let compatStatus;
    let compatColor;

    if (mcVersion) {
      const matches = tested.some((v) => {
        // Handle ranges like "1.8-1.21" or "1.8 - 1.21"
        const rangeMatch = v.match(/(\d+\.\d+)\s*[-–]\s*(\d+\.\d+)/);
        if (rangeMatch) {
          const [, from, to] = rangeMatch;
          return compareVersions(mcVersion, from) >= 0 &&
                 compareVersions(mcVersion, to)   <= 0;
        }
        // Exact match or starts-with
        return v.trim().startsWith(mcVersion.trim());
      });

      if (tested.length === 0) {
        compatStatus = t(lang, "check.unknown");
        compatColor  = "#FFA500";
      } else if (matches) {
        compatStatus = t(lang, "check.compatible");
        compatColor  = "#00FF00";
      } else {
        compatStatus = t(lang, "check.incompatible");
        compatColor  = "#FF0000";
      }
    } else {
      compatStatus = tested.length > 0
        ? `${t(lang, "check.compatible")} (${supportedVersions})`
        : t(lang, "check.unknown");
      compatColor  = tested.length > 0 ? "#00FF00" : "#FFA500";
    }

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

    const fields = [
      {
        name:  t(lang, "check.supportedVersions"),
        value: supportedVersions,
        inline: false,
      },
    ];

    if (mcVersion) {
      fields.unshift({
        name:  `Minecraft ${mcVersion}`,
        value: compatStatus,
        inline: false,
      });
    }

    fields.push(
      { name: "📦 Version",  value: data.version?.id ?? "?", inline: true },
      { name: "⬇️ Download", value: resourceURL,              inline: true }
    );

    const embed = new EmbedBuilder()
      .setAuthor({ name: t(lang, "general.author", { name: author.name }), iconURL: authorAvatarURL, url: authorURL })
      .setColor(compatColor)
      .setTitle(t(lang, "check.title", { name: resource.name }))
      .setDescription(resource.tag)
      .addFields(fields)
      .setThumbnail(resourceIconURL)
      .setTimestamp();

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

/** Vergleicht zwei Versions-Strings (z.B. "1.8" und "1.21") */
function compareVersions(a, b) {
  const pa = a.split(".").map(Number);
  const pb = b.split(".").map(Number);
  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
    const diff = (pa[i] ?? 0) - (pb[i] ?? 0);
    if (diff !== 0) return diff;
  }
  return 0;
}

function loadLang(guildID) {
  try {
    const data = JSON.parse(fs.readFileSync(`./serverdata/${guildID}.json`, "utf8"));
    return getLang(data);
  } catch { return "de"; }
}