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import {
    Client,
    Events,
    GatewayIntentBits,
    PermissionFlagsBits,
    REST,
    Routes,
} from "discord.js";

import { buttonCommands, ensureUnsolvedTag, slashCommands, getCtfForum } from "./commands.ts";

function requireEnv(key: string): string {
    let value = process.env[key];
    if (!value) {
        throw new Error(`Missing ${key} environment variable.`);
    }
    return value;
}

let clientId = requireEnv("DISCORD_CLIENT_ID");
let token = requireEnv("DISCORD_TOKEN");
let activity = requireEnv("ACTIVITY");
export let celebrationMessage = requireEnv("CELEBRATION_MESSAGE");

let client = new Client({ intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages] });

let rest = new REST({ version: "10" }).setToken(token);

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

client.on(Events.GuildAvailable, guild => {
    console.log(`Available in Guild: ${guild.name}`);
    let role = guild.roles.botRoleFor(guild.client.user);
    if (!role) {
        console.error(`Bot has no role in ${guild.name}`);
        return;
    }
    for (let permission of [
        PermissionFlagsBits.ViewChannel,
        PermissionFlagsBits.ManageChannels,
        PermissionFlagsBits.ManageRoles,
        PermissionFlagsBits.SendMessages,
        PermissionFlagsBits.SendMessagesInThreads,
        PermissionFlagsBits.CreatePublicThreads,
        PermissionFlagsBits.ManageThreads,
    ]) {
        if (!role.permissions.has(permission)) {
            console.error(`Bot is missing permission ${permission} in ${guild.name}`);
        }
    }
});

client.on(Events.InteractionCreate, async (interaction) => {
    try {
        if (interaction.isChatInputCommand()) {
            for (let command of slashCommands) {
                if (interaction.commandName === command.slashCommand.name) {
                    await command.handler(interaction);
                    break;
                }
            }
        } else if (interaction.isButton()) {
            for (let button of Object.values(buttonCommands)) {
                if (interaction.customId.startsWith(button.prefix)) {
                    let id = interaction.customId.slice(button.prefix.length);
                    await button.handler(interaction, id);
                    break;
                }
            }
        }
    } catch (error) {
        if (error === "done") return;
        console.error("Error while handling interaction", error);
        if (interaction.isChatInputCommand() || interaction.isButton()) {
            if (interaction.deferred || interaction.replied) {
                await interaction.followUp({
                    content: "Something went wrong! :(",
                    flags: "Ephemeral",
                });
            } else {
                await interaction.reply({
                    content: "Something went wrong! :(",
                    flags: "Ephemeral",
                });
            }
        }
    }
});

client.on(Events.ThreadCreate, async (thread) => {
    try {
        let forum = await getCtfForum(thread);

        if (thread.ownerId === client.user?.id)
            return;

        let tag = await ensureUnsolvedTag(forum);
        if (thread.appliedTags.includes(tag.id))
            return;

        await thread.setAppliedTags([...thread.appliedTags, tag.id]);
    } catch (error) {
        if (error === "done") return;
        console.error("Failed to auto-tag thread", error);
    }
});

await rest.put(Routes.applicationCommands(clientId), {
    body: slashCommands.map(command => command.slashCommand.toJSON()),
});

await client.login(token);

client.user?.setActivity(activity);