import client from "../client";
import { AuditLogEvent, Events, GuildAuditLogsEntry, PermissionFlagsBits, User } from "discord.js";
import { getGuildSetting } from "../tools/data";
import { Badword, database } from "../data";
import { IsNull } from "typeorm";
import getDefaultEmbed, { getFailedEmbed, getUserReportEmbed } from "../tools/defaultEmbeds";
import { getGuildChannel } from "../tools/discord";
import { Color, Emoji } from "../tools/design";

client.on(Events.ChannelUpdate, async (oldChannel, newChannel) => {
    if (oldChannel.isDMBased() || newChannel.isDMBased()) return;
    const name = newChannel.name.toLowerCase();

    const guild = oldChannel.guild;
    const settings = await getGuildSetting(guild.id);

    const globalBlocklist = await database.getRepository(Badword).find({
        where: {
            guildID: IsNull()
        }
    });
    const localBlocklist = await database.getRepository(Badword).find({
        where: {
            guildID: guild.id
        }
    });

    const blocklist = [...globalBlocklist, ...localBlocklist];
    let found: string | null = null;

    for (let i = 0; i < blocklist.length; i++) {
        const word = blocklist[i];
        if (!word) continue;

        if (!name.includes(word.value)) continue;
        found = word.value;
        break;
    }

    if (found === null) return;

    let responsibleUser: User | null;

    try {
        const clientMember = await guild.members.fetchMe();
        const canSeeAuditLog = clientMember.permissions.has(PermissionFlagsBits.ViewAuditLog);
        const auditLogs = canSeeAuditLog ? await guild.fetchAuditLogs({
            type: AuditLogEvent.ChannelUpdate,
            limit: 50
        }) : undefined;

        const change = auditLogs?.entries.filter((entry) => {
            if (entry.target.id !== newChannel.id) return false;

            return entry.changes.filter((change) => {
                return change.key === "name" && change.new === newChannel.name;
            }).length > 0;
        }).reduce<null | GuildAuditLogsEntry<AuditLogEvent.ChannelUpdate, "Update", "Channel", AuditLogEvent.ChannelUpdate>>((unknown, curr) => {
            if (!unknown) return curr;
            const prev = unknown as GuildAuditLogsEntry<AuditLogEvent.ChannelUpdate, "Update", "Channel", AuditLogEvent.ChannelUpdate>
            return curr.createdTimestamp > prev.createdTimestamp ? curr : prev;
        }, null);

        responsibleUser = change?.executor || null;
    } catch (error) {
        responsibleUser = null;
    }

    const logChannel = settings.notificationChannelID ? await getGuildChannel(guild.id, settings.notificationChannelID) : null;

    try {
        if (!newChannel.deletable) throw new Error("Missing permissions to delete channel");
        await newChannel.delete("[Automated] Detected blocked word in channel name");
    } catch (error) {
        if (!logChannel || !logChannel.isTextBased()) return;
        const embed = getFailedEmbed();
        embed.setDescription(`Couldn't delete <#${newChannel.id}> (${newChannel.id}): ${error instanceof Error ? error.message : error}`);
        embed.addFields({
            name: "Detected banned word:",
            value: `||${found}||`
        }, {
            name: "Channel renamed by:",
            value: responsibleUser ? `${responsibleUser.tag} (${responsibleUser.id})` : "`Couldn't detect responsible user :(`"
        });

        logChannel.send({
            embeds: [embed]
        }).catch(() => {});
        return;
    }

    if (responsibleUser) {
        const embed = getUserReportEmbed(guild.name, newChannel.name);
        responsibleUser.send({
            embeds: [embed]
        }).catch(() => {});
    }

    if (!logChannel || !logChannel.isTextBased()) return;
    const embed = getDefaultEmbed();
    embed.setTitle(`${Emoji.SECURITY_CHALLENGE_FAILED} Blocked word detected`);
    embed.setDescription(`||#${newChannel.name}|| (${newChannel.id}) has been deleted because its name contained a blocked word.`);
    embed.setColor(Color.WARNING_YELLOW);
    embed.addFields({
        name: "Detected banned word:",
        value: `||${found}||`,
        inline: true
    }, {
        name: "Channel renamed by:",
        value: responsibleUser ? `${responsibleUser.tag} (${responsibleUser.id})` : "`Couldn't detect responsible user :(`"
    });

    logChannel.send({
        embeds: [embed]
    }).catch(() => {});
});