import { SlashCommandBuilder, PermissionFlagsBits, EmbedBuilder, MessageFlags } from 'discord.js';
import { Command } from '../../structures/Command.js';

const command: Command = {
    data: new SlashCommandBuilder()
        .setName('welcome')
        .setDescription('Willkommens- und Abschiedsnachrichten verwalten.')
        .addSubcommand(subcommand =>
            subcommand
                .setName('setchannel')
                .setDescription('Kanal für Willkommen/Abschied setzen (Mod).')
                .addChannelOption(option =>
                    option.setName('channel')
                        .setDescription('Discord-Kanal')
                        .setRequired(true)))
        .addSubcommand(subcommand =>
            subcommand
                .setName('add')
                .setDescription('Nachricht setzen (Mod).')
                .addStringOption(option =>
                    option.setName('type')
                        .setDescription('Art der Nachricht')
                        .setRequired(true)
                        .addChoices(
                            { name: 'Willkommen', value: 'welcome' },
                            { name: 'Abschied', value: 'goodbye' }
                        ))
                .addStringOption(option =>
                    option.setName('message')
                        .setDescription('Die Nachricht. Variablen: {user}, {username}, {server}, {membercount}')
                        .setRequired(true)))
        .addSubcommand(subcommand =>
            subcommand
                .setName('remove')
                .setDescription('Nachricht entfernen (Mod).')
                .addStringOption(option =>
                    option.setName('type')
                        .setDescription('Art der Nachricht')
                        .setRequired(true)
                        .addChoices(
                            { name: 'Willkommen', value: 'welcome' },
                            { name: 'Abschied', value: 'goodbye' }
                        )))
        .addSubcommand(subcommand =>
            subcommand
                .setName('list')
                .setDescription('Aktuelle Einstellungen anzeigen.'))
        .addSubcommand(subcommand =>
            subcommand
                .setName('help')
                .setDescription('Hilfe zu Welcome-Befehlen.')),
    category: 'Admin',
    async execute(interaction: any) {
        const subcommand = interaction.options.getSubcommand();
        const guildId = interaction.guildId;
        const isAdmin = interaction.memberPermissions?.has(PermissionFlagsBits.ModerateMembers);
        const DB = interaction.client.DB;

        // Ensure guild settings exist
        DB.run('INSERT OR IGNORE INTO guild_settings (guild_id) VALUES (?)', guildId);

        if (subcommand === 'help') {
            const embed = new EmbedBuilder()
                .setTitle('👋 Welcome Hilfe')
                .setColor(0x2ecc71)
                .setDescription('Begrüße neue Mitglieder oder verabschiede dich von ihnen.')
                .addFields(
                    { name: '`/welcome setchannel <#kanal>`', value: 'Setzt den Kanal für Willkommen/Abschied (Mod).\nStandard: Discord System-Channel.', inline: false },
                    { name: '`/welcome add welcome <nachricht>`', value: 'Setzt die Willkommensnachricht (Mod).', inline: false },
                    { name: '`/welcome add goodbye <nachricht>`', value: 'Setzt die Abschiedsnachricht (Mod).', inline: false },
                    { name: '`/welcome remove welcome|goodbye`', value: 'Entfernt eine Nachricht (Mod).', inline: false },
                    { name: '`/welcome list`', value: 'Zeigt aktuelle Einstellungen.', inline: false },
                    { name: 'Variablen', value: '`{user}` - Nutzer erwähnen\n`{username}` - Nutzername\n`{server}` - Servername\n`{membercount}` - Mitgliederanzahl', inline: false },
                    { name: 'Beispiel', value: '`/welcome add welcome Willkommen {user} auf {server}! Du bist der {membercount}. Nutzer.`', inline: false }
                )
                .setTimestamp();

            await interaction.reply({ embeds: [embed], flags: [MessageFlags.Ephemeral] });
            return;
        }

        if (subcommand === 'list') {
            const settings: any = DB.get('SELECT * FROM guild_settings WHERE guild_id = ?', guildId);

            const channel = settings?.welcome_channel
                ? `<#${settings.welcome_channel}>`
                : 'Nicht gesetzt';

            const welcomeMsg = settings?.welcome_message || 'Nicht gesetzt';
            const goodbyeMsg = settings?.goodbye_message || 'Nicht gesetzt';

            const embed = new EmbedBuilder()
                .setTitle('👋 Welcome Einstellungen')
                .setColor(0x2ecc71)
                .setDescription(`Server: **${interaction.guild.name}**`)
                .addFields(
                    { name: 'Kanal', value: channel, inline: true },
                    { name: '👋 Willkommen', value: welcomeMsg, inline: false },
                    { name: '👋 Abschied', value: goodbyeMsg, inline: false }
                )
                .setTimestamp();

            await interaction.reply({ embeds: [embed], flags: [MessageFlags.Ephemeral] });
            return;
        }

        // Admin only for modify commands
        if (!isAdmin) {
            await interaction.reply({ content: '❌ Keine Berechtigung. Moderatoren erforderlich.', flags: [MessageFlags.Ephemeral] });
            return;
        }

        if (subcommand === 'setchannel') {
            const channel = interaction.options.getChannel('channel');

            DB.run(
                'UPDATE guild_settings SET welcome_channel = ? WHERE guild_id = ?',
                channel.id,
                guildId
            );

            await interaction.reply({ content: `✅ Kanal für Willkommen/Abschied auf ${channel} gesetzt.`, flags: [MessageFlags.Ephemeral] });
            return;
        }

        if (subcommand === 'add') {
            const type = interaction.options.getString('type') as 'welcome' | 'goodbye';
            const message = interaction.options.getString('message')!;

            const column = type === 'welcome' ? 'welcome_message' : 'goodbye_message';

            DB.run(
                `UPDATE guild_settings SET ${column} = ? WHERE guild_id = ?`,
                message,
                guildId
            );

            const label = type === 'welcome' ? 'Willkommensnachricht' : 'Abschiedsnachricht';
            await interaction.reply({ content: `✅ ${label} gesetzt:\n\`\`\`\n${message}\n\`\`\``, flags: [MessageFlags.Ephemeral] });
            return;
        }

        if (subcommand === 'remove') {
            const type = interaction.options.getString('type') as 'welcome' | 'goodbye';
            const column = type === 'welcome' ? 'welcome_message' : 'goodbye_message';

            DB.run(
                `UPDATE guild_settings SET ${column} = NULL WHERE guild_id = ?`,
                guildId
            );

            const label = type === 'welcome' ? 'Willkommensnachricht' : 'Abschiedsnachricht';
            await interaction.reply({ content: `✅ ${label} entfernt.`, flags: [MessageFlags.Ephemeral] });
        }
    },
};

export default command;