// /devlog-backfill — komplette Kanal-Historie scannen und alte Devlogs nacharchivieren (Admin only)
import { SlashCommandBuilder, PermissionFlagsBits, MessageFlags } from 'discord.js';
import { devlogChannelId } from '../../runtime-settings.js';
import { archiveDevlogMessage } from '../devlog-archive.js';

export const data = new SlashCommandBuilder()
    .setName('devlog-backfill')
    .setDescription('Archiviert alle bisherigen Devlogs aus dem Devlog-Kanal')
    .setDefaultMemberPermissions(PermissionFlagsBits.Administrator);

export async function execute(interaction) {
    await interaction.deferReply({ flags: MessageFlags.Ephemeral });

    const targetChannel = devlogChannelId();
    if (!targetChannel) {
        await interaction.editReply('❌ Kein Devlog-Kanal konfiguriert (Settings-Seite im Webinterface).');
        return;
    }
    const channel = await interaction.client.channels.fetch(targetChannel);
    if (!channel?.isTextBased()) {
        await interaction.editReply('❌ Devlog-Kanal nicht gefunden oder kein Textkanal.');
        return;
    }

    // Historie rückwärts in 100er-Blöcken durchlaufen (Discord-API-Maximum pro Fetch)
    let saved = 0;
    let before;
    // Aufschlüsselung nach Absender-Typ — hilft bei der Diagnose, wenn nichts archiviert wird
    const counts = { webhook: 0, bot: 0, user: 0 };
    for (;;) {
        const batch = await channel.messages.fetch({ limit: 100, before });
        if (batch.size === 0) break;

        for (const message of batch.values()) {
            if (message.webhookId) counts.webhook++;
            else if (message.author?.bot) counts.bot++;
            else counts.user++;
            if (await archiveDevlogMessage(message)) saved++;
        }
        before = batch.last().id;
    }

    const scanned = counts.webhook + counts.bot + counts.user;
    await interaction.editReply(
        `✅ Backfill fertig: ${scanned} Nachrichten gescannt ` +
        `(${counts.webhook} Webhook, ${counts.bot} Bot, ${counts.user} User), ` +
        `**${saved} Devlogs neu archiviert**.`
    );
}