/**
 * Random channels command - control where spontaneous random posts are allowed
 */

import { eq } from "drizzle-orm";
import { ChannelType, PermissionFlagsBits, SlashCommandBuilder } from "discord.js";
import type { Command } from "../types";
import { db } from "../../database";
import { botOptions } from "../../database/schema";

function parseChannelIds(raw: string | null | undefined): string[] {
  if (!raw) {
    return [];
  }

  try {
    const parsed = JSON.parse(raw);
    if (!Array.isArray(parsed)) {
      return [];
    }

    return parsed.filter((value): value is string => typeof value === "string");
  } catch {
    return [];
  }
}

async function saveChannelIds(guildId: string, channelIds: string[] | null): Promise<void> {
  const now = new Date().toISOString();

  await db
    .insert(botOptions)
    .values({
      guild_id: guildId,
      spontaneous_channel_ids: channelIds && channelIds.length > 0 ? JSON.stringify(channelIds) : null,
      updated_at: now,
    })
    .onConflictDoUpdate({
      target: botOptions.guild_id,
      set: {
        spontaneous_channel_ids: channelIds && channelIds.length > 0 ? JSON.stringify(channelIds) : null,
        updated_at: now,
      },
    });
}

const command: Command = {
  data: new SlashCommandBuilder()
    .setName("random-channels")
    .setDescription("Control which channels Joel can use for spontaneous random posts")
    .setDMPermission(false)
    .setDefaultMemberPermissions(PermissionFlagsBits.ManageGuild)
    .addSubcommand((subcommand) =>
      subcommand
        .setName("add")
        .setDescription("Allow random posts in one channel")
        .addChannelOption((option) =>
          option
            .setName("channel")
            .setDescription("Channel to allow for random posts")
            .addChannelTypes(ChannelType.GuildText)
            .setRequired(true)
        )
    )
    .addSubcommand((subcommand) =>
      subcommand
        .setName("remove")
        .setDescription("Remove one channel from random post allowlist")
        .addChannelOption((option) =>
          option
            .setName("channel")
            .setDescription("Channel to remove")
            .addChannelTypes(ChannelType.GuildText)
            .setRequired(true)
        )
    )
    .addSubcommand((subcommand) =>
      subcommand
        .setName("clear")
        .setDescription("Clear allowlist so random posts can use any channel")
    )
    .addSubcommand((subcommand) =>
      subcommand
        .setName("status")
        .setDescription("Show current random post channel settings")
    ) as SlashCommandBuilder,
  category: "moderation",
  execute: async (interaction) => {
    if (!interaction.inGuild()) {
      await interaction.reply({ content: "This command can only be used in a server.", ephemeral: true });
      return;
    }

    const guildId = interaction.guildId;
    const subcommand = interaction.options.getSubcommand();

    const existing = await db
      .select({ spontaneous_channel_ids: botOptions.spontaneous_channel_ids })
      .from(botOptions)
      .where(eq(botOptions.guild_id, guildId))
      .limit(1);

    const currentIds = parseChannelIds(existing[0]?.spontaneous_channel_ids);

    if (subcommand === "add") {
      const channel = interaction.options.getChannel("channel", true);

      if (currentIds.includes(channel.id)) {
        await interaction.reply({
          content: `<#${channel.id}> is already allowed for random posts.`,
          ephemeral: true,
        });
        return;
      }

      const updatedIds = [...currentIds, channel.id];
      await saveChannelIds(guildId, updatedIds);

      await interaction.reply({
        content: `✅ Added <#${channel.id}> to Joel's random post channels.`,
        ephemeral: true,
      });
      return;
    }

    if (subcommand === "remove") {
      const channel = interaction.options.getChannel("channel", true);

      if (!currentIds.includes(channel.id)) {
        await interaction.reply({
          content: `<#${channel.id}> is not currently in the random post allowlist.`,
          ephemeral: true,
        });
        return;
      }

      const updatedIds = currentIds.filter((channelId) => channelId !== channel.id);
      await saveChannelIds(guildId, updatedIds.length > 0 ? updatedIds : null);

      await interaction.reply({
        content: `✅ Removed <#${channel.id}> from Joel's random post channels.`,
        ephemeral: true,
      });
      return;
    }

    if (subcommand === "clear") {
      await saveChannelIds(guildId, null);

      await interaction.reply({
        content: "✅ Random post channel allowlist cleared. Joel can now randomly post in any writable text channel.",
        ephemeral: true,
      });
      return;
    }

    if (currentIds.length === 0) {
      await interaction.reply({
        content: "🌐 No random post channel allowlist is set. Joel can randomly post in any writable text channel.",
        ephemeral: true,
      });
      return;
    }

    const list = currentIds.map((channelId) => `<#${channelId}>`).join(", ");
    await interaction.reply({
      content: `📍 Joel can randomly post in: ${list}`,
      ephemeral: true,
    });
  },
};

export default command;