/**
 * bot.ts
 * Scans the chat for reactions and updates the leaderboard database.
 */

import { Client, Events, GatewayIntentBits, MessageReaction, PartialMessageReaction, Partials, User } from 'discord.js';
import { db, openDb, reactionEmojis, recordReaction, sync } from './util';

const client = new Client({
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages, GatewayIntentBits.GuildMessageReactions],
    partials: [Partials.Message, Partials.Channel, Partials.Reaction],
});

client.once(Events.ClientReady, async () => {
    console.log('[bot] Ready.');
    for (let i = 0; i < reactionEmojis.length; ++i)
        console.log(`[bot] config: reaction_${i + 1} = ${reactionEmojis[i]}`);
});

async function onMessageReactionChanged(reaction: MessageReaction | PartialMessageReaction, user: User)
{
    // When a reaction is received, check if the structure is partial
    if (reaction.partial) {
        // If the message this reaction belongs to was removed, the fetching might result in an API error which should be handled
        try {
            await reaction.fetch();
        } catch (error) {
            console.error('[bot] Something went wrong when fetching the reaction:', error);
            // Return as `reaction.message.author` may be undefined/null
            return;
        }
    }
    if (reaction.message.partial) {
        // If the message this reaction belongs to was removed, the fetching might result in an API error which should be handled
        try {
            await reaction.message.fetch();
        } catch (error) {
            console.error('[bot] Something went wrong when fetching the message:', error);
            // Return as `reaction.message.author` may be undefined/null
            return;
        }
    }

    // Now the message has been cached and is fully available
    console.log(`[bot] ${reaction.message.author.id}'s message reaction count changed: ${reaction.emoji.name}x${reaction.count}`);
    await recordReaction(<MessageReaction> reaction);
}

client.on(Events.MessageReactionAdd, onMessageReactionChanged);
client.on(Events.MessageReactionRemove, onMessageReactionChanged);

async function startup() {
    console.log("[db] Opening...");
    await openDb();
    console.log("[db] Migrating...");
    await db.migrate();
    console.log("[db] Ready.");
    console.log("[bot] Logging in...");
    await client.login(process.env.TOKEN);
    await sync(client.guilds);
}

startup();