const { ChannelType } = require('discord.js');
const { successEmbed, errorEmbed, warnEmbed } = require('../utils/embeds');

module.exports = {
    async execute(client, message, args) {
        // Usage: `clear <channel_id>`
        const channelIdStr = args[0]?.replace(/[<#>]/g, '');
        if (!channelIdStr || !/^\d{17,20}$/.test(channelIdStr)) {
            return message.reply({
                embeds: [errorEmbed('Invalid Channel', 'Usage: `clear <channel_id>`\nExample: `clear 1234567890` or `clear #resources`')],
            });
        }

        const guild = await client.guilds.fetch(process.env.GUILD_ID);
        const channel = await guild.channels.fetch(channelIdStr).catch(() => null);

        if (!channel || channel.type !== ChannelType.GuildText) {
            return message.reply({
                embeds: [errorEmbed('Channel Not Found', 'Could not find a valid text channel with that ID.')],
            });
        }

        await message.reply({
            embeds: [warnEmbed('⏳ Clearing Drops', `Fetching and deleting messages posted by WSB in <#${channel.id}>...\nThis might take a moment.`)],
        });

        try {
            let deletedCount = 0;
            let lastId = null;
            let fetched;

            // Loop to fetch and delete messages in batches of 100
            do {
                const fetchOptions = { limit: 100 };
                if (lastId) fetchOptions.before = lastId;

                fetched = await channel.messages.fetch(fetchOptions);
                if (fetched.size === 0) break;

                // Filter for messages sent by the bot
                const botMessages = fetched.filter(m => m.author.id === client.user.id);

                if (botMessages.size > 0) {
                    // Bulk delete is faster for messages under 14 days old
                    // For safety and to handle old messages, we'll delete one by one if bulk fails
                    try {
                        await channel.bulkDelete(botMessages, true); // true = filter out 14+ day old ones
                        deletedCount += botMessages.size;
                    } catch (bulkErr) {
                        console.warn('[Clear] Bulk delete failed or partially failed, falling back to manual deletion');
                        // Fallback manual deletion for older messages
                        for (const msg of botMessages.values()) {
                            await msg.delete().catch(() => { });
                            deletedCount++;
                        }
                    }
                }

                lastId = fetched.last().id;
            } while (fetched.size === 100);

            await message.reply({
                embeds: [successEmbed('✅ Clear Complete', `Successfully deleted **${deletedCount}** WSB messages from <#${channel.id}>.`)],
            });
        } catch (err) {
            console.error('[Clear Error]', err);
            await message.reply({
                embeds: [errorEmbed('❌ Clear Failed', `An error occurred while clearing messages: \`${err.message}\``)],
            });
        }
    },
};