import {
  SlashCommandChannelOption,
  SlashCommandBuilder,
  ChannelType,
  Routes,
  REST,
} from 'discord.js';
import { config } from './config';
import { packageJson } from './util';

export const CHANNEL_OPTIONS_MAX = 25;

export const helpCommand = new SlashCommandBuilder()
  .setName('help')
  .setDescription(`How to use ${packageJson().name}`);

export const inviteCommand = new SlashCommandBuilder()
  .setName('invite')
  .setDescription('Get the invite link for this bot.');

export const messageCommand = new SlashCommandBuilder()
  .setName(config.slashCommandName)
  .setDescription('Generate a message from learned past messages')
  .addBooleanOption((debug) =>
    debug
      .setName('debug')
      .setDescription('Follow up the generated message with the detailed sources that inspired it.')
      .setRequired(false),
  )
  .addStringOption((seed) =>
    seed
      .setName('seed')
      .setDescription(
        `A ${config.stateSize}-word phrase to attempt to start a generated sentence with.`,
      )
      .setRequired(false),
  );

/**
 * Helps generate a list of parameters for channel options
 */
const channelOptionsGenerator = (builder: SlashCommandChannelOption, index: number) =>
  builder
    .setName(`channel-${index + 1}`)
    .setDescription('A text channel')
    .setRequired(index === 0)
    .addChannelTypes(ChannelType.GuildText);

export const autoRespondCommand = new SlashCommandBuilder()
  .setName('autorespond')
  .setDescription('Configure channels where the bot will automatically respond to all messages')
  .addSubcommand((sub) => {
    sub
      .setName('add')
      .setDescription('Add channels where the bot will automatically respond to all messages');
    Array.from(Array(CHANNEL_OPTIONS_MAX).keys()).forEach((index) =>
      sub.addChannelOption((opt) => channelOptionsGenerator(opt, index)),
    );
    return sub;
  })
  .addSubcommand((sub) => {
    sub
      .setName('remove')
      .setDescription('Remove channels from auto-response');
    Array.from(Array(CHANNEL_OPTIONS_MAX).keys()).forEach((index) =>
      sub.addChannelOption((opt) => channelOptionsGenerator(opt, index)),
    );
    return sub;
  })
  .addSubcommand((sub) =>
    sub
      .setName('list')
      .setDescription('List the channels where the bot auto-responds to messages'),
  )
  .addSubcommand((sub) =>
    sub
      .setName('modify')
      .setDescription('Add or remove auto-respond channels via select menu UI (first 25 text channels only)'),
  );

export const listenChannelCommand = new SlashCommandBuilder()
  .setName('listen')
  .setDescription('Change what channels the bot actively listens to and learns from.')
  .addSubcommand((sub) => {
    sub
      .setName('add')
      .setDescription(
        `Add channels to learn from. Doesn't add the channel's past messages; re-train to do that.`,
      );
    Array.from(Array(CHANNEL_OPTIONS_MAX).keys()).forEach((index) =>
      sub.addChannelOption((opt) => channelOptionsGenerator(opt, index)),
    );
    return sub;
  })
  .addSubcommand((sub) => {
    sub
      .setName('remove')
      .setDescription(
        `Remove channels from being learned from. Doesn't remove the channel's data; re-train to do that.`,
      );
    Array.from(Array(CHANNEL_OPTIONS_MAX).keys()).forEach((index) =>
      sub.addChannelOption((opt) => channelOptionsGenerator(opt, index)),
    );
    return sub;
  })
  .addSubcommand((sub) =>
    sub
      .setName('list')
      .setDescription(`List the channels the bot is currently actively listening to.`),
  )
  .addSubcommand((sub) =>
    sub
      .setName('modify')
      .setDescription(`Add or remove channels via select menu UI (first 25 text channels only)`),
  );

export const trainCommand = new SlashCommandBuilder()
  .setName('train')
  .setDescription(
    'Train from past messages from the configured listened channels. This takes a while.',
  )
  .addBooleanOption((clean) =>
    clean
      .setName('clean')
      .setDescription(
        'Whether the database should be emptied before training. Default is true (recommended).',
      )
      .setRequired(false),
  )
  .addAttachmentOption((json) =>
    json
      .setName('json')
      .setDescription('Train from a provided JSON file rather than channel history.')
      .setRequired(false),
  );

const commands = [
  helpCommand.toJSON(),
  inviteCommand.toJSON(),
  messageCommand.toJSON(),
  listenChannelCommand.toJSON(),
  autoRespondCommand.toJSON(),
  trainCommand.toJSON()
];

export async function deployCommands(clientId: string) {
  const rest = new REST({ version: '10' }).setToken(config.token);
  if (config.devGuildId) {
    await rest.put(Routes.applicationGuildCommands(clientId, config.devGuildId), {
      body: commands,
    });
  } else {
    await rest.put(Routes.applicationCommands(clientId), { body: commands });
  }
}