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path: root/bot/app.js
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const 
{
    Client,
    Events,
    GatewayIntentBits
} = require("discord.js")

const axios = require("axios")
const fs = require("fs-extra")
const path = require("path")

const config = require("../config/config.json")
const api = require("../config/api.json")

const 
{
    channel_id,
    check_interval_minutes,
    minecraft_version,
    fabric_loader_version,
    loader_meta_version,
    modrinth_mods
} = config

const { token } = api

const cacheFile = path.join(__dirname, "../cache/mod_versions.json")
const client = new Client
({
    intents:
    [
        GatewayIntentBits.Guilds,
        GatewayIntentBits.GuildMessages
    ]
})

const LoadCache = async () =>
{
    try
    {
        if (await fs.pathExists(cacheFile))
            return JSON.parse(await fs.readFile(cacheFile, "utf8"))
    }
    catch (err)
    {
        console.error("[Cache] Failed to load:", err)
    }
    return {}
}

const SaveCache = async cache =>
{
    try
    {
        await fs.ensureDir(path.dirname(cacheFile))
        await fs.writeFile(cacheFile, JSON.stringify(cache, null, 2))
    }
    catch (err)
    {
        console.error("[Cache] Failed to save:", err)
    }
}

const GetModVersions = async slug =>
{
    try
    {
        const response = await axios.get(`https://api.modrinth.com/v2/project/${slug}/version`)
        return response.data
    }
    catch (err)
    {
        console.error(`[Modrinth] Failed for ${slug}:`, err.message)
        return null
    }
}

const CheckMods = async () =>
{
    const cache = await LoadCache()
    const newCache = { ...cache }

    const noCompatible = []
    const newlyCompatible = []
    const stillCompatibleUpdate = []

    for (const slug of modrinth_mods)
    {
        const versions = await GetModVersions(slug)
        if (!versions)
            continue

        const latest = versions.sort((a, b) => new Date(b.date_published) - new Date(a.date_published))[0]
        const compatible = versions.find(v => v.game_versions.includes(minecraft_version)) || null

        const cached = cache[slug] ||
        {
            compatible: null,
            latest: null
        }

        newCache[slug] =
        {
            compatible: compatible ? compatible.id : null,
            latest: latest.id
        }

        if (!compatible)
        {
            noCompatible.push(slug)
            continue
        }

        if (!cached.compatible && compatible)
        {
            newlyCompatible.push(slug)
            continue
        }

        if (latest.id !== cached.latest)
            stillCompatibleUpdate.push(slug)
    }

    await SaveCache(newCache)

    return { noCompatible, newlyCompatible, stillCompatibleUpdate }
}

const SendUpdate = async (channel, noCompatible, newlyCompatible, stillCompatibleUpdate) =>
{
    if (!noCompatible.length && !newlyCompatible.length && !stillCompatibleUpdate.length)
        return

    let msg = `**Modrinth Compatibility — ${minecraft_version}**\n\n`

    if (noCompatible.length)
    {
        msg += `**❌ No compatible version available:**\n`
        for (const slug of noCompatible)
            msg += `❌ ${slug}\n`
        msg += `\n`
    }

    if (newlyCompatible.length)
    {
        msg += `**🎉 Now Compatible:**\n`
        for (const slug of newlyCompatible)
            msg += `🎉 ${slug}\n`
        msg += `\n`
    }

    if (stillCompatibleUpdate.length)
    {
        msg += `**🟢 Updated (still compatible):**\n`
        for (const slug of stillCompatibleUpdate)
            msg += `🟢 ${slug}\n`
        msg += `\n`
    }

    await channel.send
    ({
        content: msg,
        allowedMentions: { parse: [] }
    })

    console.log("[Discord] Update message sent.")
}

client.once(Events.ClientReady, async c =>
{
    console.log(`[OK] Logged in as ${c.user.tag}`)

    let channel = null
    try
    {
        channel = await client.channels.fetch(channel_id)
        console.log("Fetched channel:", channel.name, "type:", channel.type)
    }
    catch
    {
        console.error("❌ Failed to fetch channel:", channel_id)
        return
    }

    const 
    {
        noCompatible,
        newlyCompatible,
        stillCompatibleUpdate
    } = await CheckMods()

    await SendUpdate(channel, noCompatible, newlyCompatible, stillCompatibleUpdate)

    setInterval(async () =>
    {
        const 
        {
            noCompatible,
            newlyCompatible,
            stillCompatibleUpdate
        } = await CheckMods()

        await SendUpdate(channel, noCompatible, newlyCompatible, stillCompatibleUpdate)
    }, check_interval_minutes * 60 * 1000)
})

client.login(token)