// Moderation & Kontakt: Modmail (DM ↔ Staff-Thread), Willkommens-Embed, Mod-Log
import { ChannelType, EmbedBuilder, Events } from 'discord.js';
import { saveModmail, modmailByUser, modmailByThread, saveStickyRoles, stickyRolesOf } from '../db.js';
import { modmailChannelId, welcomeChannelId, modlogChannelId, publicUrl, autoroleId, stickyRolesEnabled, brandColor, brandColor2, brandFooter } from '../runtime-settings.js';


/* ── Modmail ───────────────────────────────────────── */

/** Staff-Thread für einen User finden oder anlegen */
async function ensureModmailThread(client, user) {
    const channelId = modmailChannelId();
    if (!channelId) return null;
    const channel = await client.channels.fetch(channelId).catch(() => null);
    if (!channel?.threads) return null;

    const existing = modmailByUser(user.id);
    if (existing) {
        const thread = await client.channels.fetch(existing.thread_id).catch(() => null);
        if (thread) {
            if (thread.archived) await thread.setArchived(false).catch(() => {});
            return thread;
        }
    }

    const thread = await channel.threads.create({
        name: `📬 ${user.username}`,
        autoArchiveDuration: 10080, // 7 Tage
        type: ChannelType.PublicThread,
    });
    saveModmail(user.id, thread.id, user.username);
    await thread.send({
        embeds: [
            new EmbedBuilder()
                .setColor(brandColor())
                .setDescription(
                    `Neue Modmail-Konversation mit **${user.username}** (<@${user.id}>).\n` +
                    'Antworten in diesem Thread gehen als DM an den User.'
                )
                .setFooter({ text: brandFooter('MODMAIL'), iconURL: member.client?.user?.displayAvatarURL?.({ size: 64 }) }),
        ],
    });
    return thread;
}

/** DM vom User → in den Staff-Thread spiegeln */
async function handleIncomingDm(client, message) {
    const thread = await ensureModmailThread(client, message.author);
    if (!thread) return; // Feature aus → DM ignorieren

    const files = [...message.attachments.values()].map((a) => a.url).slice(0, 5);
    await thread.send({
        content: `**${message.author.username}:** ${message.content || ''}${
            files.length ? `\n${files.join('\n')}` : ''
        }`.slice(0, 2000),
        allowedMentions: { parse: [] },
    });
    await message.react('📬').catch(() => {});
}

/** Staff-Antwort im Thread → als DM an den User */
async function handleThreadReply(client, message) {
    const row = modmailByThread(message.channelId);
    if (!row) return;

    const user = await client.users.fetch(row.user_id).catch(() => null);
    if (!user) return;
    try {
        await user.send(
            `**${message.member?.displayName ?? message.author.username}:** ${message.content}`.slice(0, 2000)
        );
        await message.react('✅').catch(() => {});
    } catch {
        await message.react('⚠️').catch(() => {});
        await message.reply('DM nicht zustellbar (User blockt DMs).').catch(() => {});
    }
}

/* ── Willkommens-Embed ─────────────────────────────── */

async function handleMemberAdd(member) {
    const channelId = welcomeChannelId();
    if (!channelId) return;
    const channel = await member.client.channels.fetch(channelId).catch(() => null);
    if (!channel?.isTextBased()) return;

    const embed = new EmbedBuilder()
        .setColor(brandColor())
        .setTitle(`👋 Willkommen, ${member.displayName}!`)
        .setThumbnail(member.user.displayAvatarURL({ size: 128 }))
        .setDescription(
            `Schön, dass du da bist — du bist Mitglied **#${member.guild.memberCount}**.\n\n` +
            `📔 Devlogs & Roadmap: ${publicUrl()}\n` +
            '🧪 Playtester werden? Schau nach dem Bewerbungs-Post!\n' +
            '🐛 Bug gefunden? Einfach `/bug` benutzen.'
        )
        .setFooter({ text: brandFooter('COMMUNITY'), iconURL: member.client?.user?.displayAvatarURL?.({ size: 64 }) })
        .setTimestamp();

    await channel.send({ content: `<@${member.id}>`, embeds: [embed] });
}

/* ── Auto- & Sticky-Roles ──────────────────────────── */

/** Beim Join: gesicherte Rollen wiederherstellen + Auto-Rolle vergeben */
async function restoreRoles(member) {
    const roleIds = new Set();
    if (stickyRolesEnabled()) {
        for (const id of stickyRolesOf(member.id)) roleIds.add(id);
    }
    const auto = autoroleId();
    if (auto) roleIds.add(auto);

    for (const id of roleIds) {
        const role = member.guild.roles.cache.get(id);
        if (!role || role.managed || role.id === member.guild.id) continue;
        await member.roles.add(id).catch((e) =>
            console.error(`[roles] Rolle ${id} bei Join fehlgeschlagen: ${e.message}`)
        );
    }
}

/* ── Mod-Log ───────────────────────────────────────── */

async function logToModlog(client, embed) {
    const channelId = modlogChannelId();
    if (!channelId) return;
    const channel = await client.channels.fetch(channelId).catch(() => null);
    if (!channel?.isTextBased()) return;
    await channel.send({ embeds: [embed] });
}

function trimmed(text) {
    const t = (text ?? '').trim();
    return t.length > 900 ? `${t.slice(0, 900)}…` : t || '*[kein Text / nicht im Cache]*';
}

/* ── Registrierung ─────────────────────────────────── */

export function registerModTools(client) {
    // Modmail: eingehende DMs + Staff-Antworten in Threads
    client.on(Events.MessageCreate, async (message) => {
        try {
            if (message.author?.bot) return;
            if (message.channel?.type === ChannelType.DM) {
                await handleIncomingDm(client, message);
            } else if (
                message.channel?.isThread?.() &&
                message.channel.parentId === modmailChannelId()
            ) {
                await handleThreadReply(client, message);
            }
        } catch (error) {
            console.error('[modmail] Fehler:', error);
        }
    });

    // Willkommens-Embed + Auto-/Sticky-Roles + Join-Log
    client.on(Events.GuildMemberAdd, async (member) => {
        try {
            await handleMemberAdd(member);
            await restoreRoles(member);
            await logToModlog(client, new EmbedBuilder()
                .setColor(0x00ff88)
                .setTitle('📥 Member beigetreten')
                .setDescription(`**${member.user.username}** (<@${member.id}>) — Mitglied #${member.guild.memberCount}`)
                .setTimestamp());
        } catch (error) {
            console.error('[welcome] Fehler:', error);
        }
    });

    // Leave: Rollen für Sticky-Restore sichern + Log
    client.on(Events.GuildMemberRemove, async (member) => {
        try {
            const roleIds = [...(member.roles?.cache?.values() ?? [])]
                .filter((r) => r.id !== member.guild.id && !r.managed)
                .map((r) => r.id);
            if (roleIds.length > 0) saveStickyRoles(member.id, roleIds);

            await logToModlog(client, new EmbedBuilder()
                .setColor(brandColor2())
                .setTitle('📤 Member gegangen')
                .setDescription(`**${member.user?.username ?? member.id}**${roleIds.length ? ` — Rollen gesichert (${roleIds.length})` : ''}`)
                .setTimestamp());
        } catch (error) {
            console.error('[modlog] Leave-Handling fehlgeschlagen:', error);
        }
    });

    // Nick-/Rollen-Änderungen loggen
    client.on(Events.GuildMemberUpdate, async (oldMember, newMember) => {
        try {
            const changes = [];
            if (oldMember.nickname !== newMember.nickname) {
                changes.push({
                    name: 'Nickname',
                    value: `\`${oldMember.nickname ?? oldMember.user?.username ?? '—'}\` → \`${newMember.nickname ?? newMember.user?.username ?? '—'}\``,
                });
            }
            const oldIds = new Set(oldMember.roles?.cache?.keys?.() ?? []);
            const newIds = new Set(newMember.roles?.cache?.keys?.() ?? []);
            const added = [...newIds].filter((id) => !oldIds.has(id) && id !== newMember.guild.id);
            const removed = [...oldIds].filter((id) => !newIds.has(id) && id !== newMember.guild.id);
            if (added.length) changes.push({ name: 'Rollen +', value: added.map((id) => `<@&${id}>`).join(' ') });
            if (removed.length) changes.push({ name: 'Rollen −', value: removed.map((id) => `<@&${id}>`).join(' ') });
            if (changes.length === 0) return;

            await logToModlog(client, new EmbedBuilder()
                .setColor(brandColor())
                .setTitle('👤 Member geändert')
                .setDescription(`**${newMember.user?.username ?? newMember.id}**`)
                .addFields(changes)
                .setTimestamp());
        } catch (error) {
            console.error('[modlog] Member-Update fehlgeschlagen:', error);
        }
    });

    // Mod-Log: gelöschte + bearbeitete Nachrichten (User-Nachrichten in Guild-Kanälen)
    client.on(Events.MessageDelete, async (message) => {
        try {
            if (!message.guildId || message.author?.bot) return;
            if (message.channelId === modlogChannelId()) return;
            await logToModlog(client, new EmbedBuilder()
                .setColor(brandColor2())
                .setTitle('🗑️ Nachricht gelöscht')
                .addFields(
                    { name: 'User', value: message.author ? `${message.author.username}` : 'unbekannt', inline: true },
                    { name: 'Kanal', value: `<#${message.channelId}>`, inline: true },
                    { name: 'Inhalt', value: trimmed(message.content) }
                )
                .setTimestamp());
        } catch (error) {
            console.error('[modlog] Fehler:', error);
        }
    });

    client.on(Events.MessageUpdate, async (oldMessage, newMessage) => {
        try {
            if (!newMessage.guildId || newMessage.author?.bot) return;
            if (oldMessage.content === newMessage.content) return; // z. B. nur Embed-Update
            await logToModlog(client, new EmbedBuilder()
                .setColor(brandColor())
                .setTitle('✏️ Nachricht bearbeitet')
                .addFields(
                    { name: 'User', value: newMessage.author?.username ?? 'unbekannt', inline: true },
                    { name: 'Kanal', value: `<#${newMessage.channelId}>`, inline: true },
                    { name: 'Vorher', value: trimmed(oldMessage.content) },
                    { name: 'Nachher', value: trimmed(newMessage.content) }
                )
                .setTimestamp());
        } catch (error) {
            console.error('[modlog] Fehler:', error);
        }
    });
}