import { ChatInputCommandInteraction, TextChannel, Collection, Message } from "discord.js";
import { Config } from "../../systems/config";
import { polls } from "../../systems/poll";
import { replyAndDelete } from "../../utils";

export async function handlePurge(interaction: ChatInputCommandInteraction): Promise<void> {
  const channelId = Config.get({ section: "channels", key: "poll" });
  const channel   = await interaction.client.channels.fetch(channelId) as TextChannel;
  if (!channel) return void replyAndDelete(interaction, "❌ Poll channel not found.");

  // Clear active poll state
  polls.clear();

  // Fetch and delete bot messages in bulk (Discord allows bulk delete for messages < 14 days old)
  let deleted = 0;
  let messages: Collection<string, Message>;

  do {
    messages = await channel.messages.fetch({ limit: 100 });
    const botMessages = messages.filter((m) => m.author.id === interaction.client.user!.id);
    if (botMessages.size === 0) break;

    if (botMessages.size === 1) {
      await botMessages.first()!.delete();
    } else {
      await channel.bulkDelete(botMessages, true); // true = skip messages older than 14 days
    }
    deleted += botMessages.size;
  } while (messages.size === 100);

  return void replyAndDelete(interaction, `🗑️ Deleted **${deleted}** bot message(s) from <#${channelId}>.`);
}