const { ChannelType, PermissionFlagsBits } = require('discord.js');
const { createEmbed } = require('../utils/embeds');
const { Colors } = require('../config');

module.exports = {
    name: 'permission audit',
    async execute(client, message) {
        const guildId = process.env.GUILD_ID;
        const guild = await client.guilds.fetch(guildId);
        await guild.channels.fetch();

        const issues = [];
        const report = [];

        const categories = guild.channels.cache
            .filter(c => c.type === ChannelType.GuildCategory)
            .sort((a, b) => a.position - b.position);

        for (const [, category] of categories) {
            const catReport = [`📁 **${category.name}**`];
            const children = guild.channels.cache
                .filter(c => c.parentId === category.id)
                .sort((a, b) => a.position - b.position);

            for (const [, channel] of children) {
                const everyone = channel.permissionOverwrites.cache.get(guild.roles.everyone.id);
                const everyoneView = everyone?.deny?.has(PermissionFlagsBits.ViewChannel) ? '🔒' : '👁️';
                const everyoneSend = everyone?.deny?.has(PermissionFlagsBits.SendMessages) ? '🔇' : '💬';

                catReport.push(`  └ ${channel.name} — ${everyoneView} ${everyoneSend}`);

                // Check for potential issues
                if (!everyone) {
                    issues.push(`⚠️ ${channel.name} — no @everyone override set`);
                }
            }

            report.push(catReport.join('\n'));
        }

        // Legend
        const legend = '```\n👁️ = @everyone can view\n🔒 = @everyone cannot view\n💬 = @everyone can send\n🔇 = @everyone cannot send\n```';

        const embed = createEmbed({
            title: '🛡️ Permission Audit',
            description: legend + '\n\n' + report.join('\n\n'),
            color: Colors.INFO,
        });

        const parts = [];
        const embedStr = legend + '\n\n' + report.join('\n\n');

        // Discord embed limit is 4096 characters
        if (embedStr.length > 4000) {
            // Send as file instead
            const buffer = Buffer.from(report.join('\n\n'), 'utf-8');
            await message.reply({
                embeds: [createEmbed({
                    title: '🛡️ Permission Audit',
                    description: `${legend}\n\nFull report attached (too long for embed).${issues.length ? '\n\n**Issues Found:**\n' + issues.join('\n') : '\n\n✅ No issues found.'}`,
                    color: Colors.INFO,
                })],
                files: [{ attachment: buffer, name: 'permission-audit.txt' }],
            });
        } else {
            const desc = embedStr + (issues.length ? '\n\n**Issues Found:**\n' + issues.join('\n') : '\n\n✅ No issues found.');
            await message.reply({
                embeds: [createEmbed({ title: '🛡️ Permission Audit', description: desc, color: Colors.INFO })],
            });
        }
    },
};