// /giveaway — Verlosung starten (Admin): 🎉-Button zum Teilnehmen, automatische Ziehung
import {
    SlashCommandBuilder, PermissionFlagsBits, MessageFlags,
    ActionRowBuilder, ButtonBuilder, ButtonStyle, EmbedBuilder,
} from 'discord.js';
import { saveGiveaway } from '../../db.js';
import { brandColor, brandFooter } from '../../runtime-settings.js';

/** "30m" / "2h" / "1d" → Millisekunden (null bei Unsinn) */
export function parseDuration(input) {
    const m = String(input).trim().match(/^(\d+)\s*(m|h|d)$/i);
    if (!m) return null;
    const factor = { m: 60_000, h: 3_600_000, d: 86_400_000 }[m[2].toLowerCase()];
    const ms = Number(m[1]) * factor;
    return ms >= 60_000 && ms <= 30 * 86_400_000 ? ms : null;
}

export const data = new SlashCommandBuilder()
    .setName('giveaway')
    .setDescription('Verlosung in diesem Kanal starten')
    .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
    .addStringOption((o) => o.setName('preis').setDescription('Was gibt es zu gewinnen?').setRequired(true).setMaxLength(200))
    .addStringOption((o) => o.setName('dauer').setDescription('z. B. 30m, 2h, 1d').setRequired(true))
    .addIntegerOption((o) => o.setName('gewinner').setDescription('Anzahl Gewinner (Default 1)').setMinValue(1).setMaxValue(20));

export async function execute(interaction) {
    const duration = parseDuration(interaction.options.getString('dauer'));
    if (!duration) {
        await interaction.reply({
            content: '❌ Dauer bitte als `30m`, `2h` oder `1d` (1 Minute bis 30 Tage).',
            flags: MessageFlags.Ephemeral,
        });
        return;
    }
    const prize = interaction.options.getString('preis');
    const winners = interaction.options.getInteger('gewinner') ?? 1;
    const endsAt = new Date(Date.now() + duration);

    const embed = new EmbedBuilder()
        .setColor(brandColor())
        .setTitle(`🎉 Giveaway: ${prize}`)
        .setDescription(
            `Klick auf den Button zum Teilnehmen!\n\n` +
            `🏆 **${winners}** Gewinner · ⏰ Ziehung <t:${Math.floor(endsAt.getTime() / 1000)}:R>`
        )
        .setFooter({ text: brandFooter('GIVEAWAY') })
        .setTimestamp(endsAt);

    const row = new ActionRowBuilder().addComponents(
        new ButtonBuilder().setCustomId('giveaway_enter').setStyle(ButtonStyle.Primary).setLabel('Teilnehmen').setEmoji('🎉')
    );

    const message = await interaction.channel.send({ embeds: [embed], components: [row] });
    saveGiveaway({
        message_id: message.id,
        channel_id: message.channelId,
        prize,
        winners,
        // SQLite vergleicht mit datetime('now') im UTC-Format
        ends_at: endsAt.toISOString().slice(0, 19).replace('T', ' '),
    });
    await interaction.reply({ content: '✅ Giveaway gestartet!', flags: MessageFlags.Ephemeral });
}