import { Client, CommandInteraction, GuildMember, MessageEmbed, TextChannel } from 'discord.js';
import * as fsp from 'fs/promises';
import { exists, getSign } from './util';

const counterFile = './counter.json';
const counterFileCream = './counterCream.json';
const counterMessageFile = './counterMessageID.txt';
const counterCreamMessageFile = './counterCreamMessageID.txt';

const PISS_CHANNEL = '975802147126018150';
const CREAM_CHANNEL = '1098319707741900910';
export const PISS_EMOJI = '🪣';
export const CREAM_EMOJI = '<:PoolOfCum:1070350928240181340>';

function getCounterFile(cream: boolean) {
  return cream ? counterFileCream : counterFile;
}

let counter = 0;

export async function initializeCounter(cream: boolean) {
  const filename = getCounterFile(cream);
  if (await exists(filename)) {
    counter = parseInt(await fsp.readFile(filename, 'utf8'));
  } else {
    counter = 0;
    await saveCounter(cream);
  }
}

async function saveCounter(cream: boolean) {
  fsp.writeFile(getCounterFile(cream), Math.trunc(counter).toString());
}

export async function changeCounter(delta: number, cream: boolean) {
  counter += delta;
  await saveCounter(cream);
  return counter;
}

function getCounterMessageFile(cream: boolean) {
  return cream ? counterMessageFile : counterCreamMessageFile;
}

async function getCounterMessageID(cream: boolean) {
  const filename = getCounterMessageFile(cream);
  if (await exists(filename)) {
    const str = await fsp.readFile(filename, 'utf8');
    return str;
  } else {
    return null;
  }
}

function saveCounterMessageID(id: string, cream: boolean) {
  return fsp.writeFile(getCounterMessageFile(cream), id);
}

function getEmoji(cream: boolean) {
  return cream ? CREAM_EMOJI : PISS_EMOJI;
}

function getChannel(cream: boolean) {
  return cream ? CREAM_CHANNEL : PISS_CHANNEL;
}

export async function updateCounter(bot: Client, cream: boolean) {
  const channel = await bot.channels.fetch(getChannel(cream)) as TextChannel;
  const messageID = await getCounterMessageID(cream);

  const content = `[${getEmoji(cream)}] x${counter}`;

  // bit janky
  try {
    if (messageID) {
      const message = await channel.messages.fetch(messageID);
      if (!message) throw new Error();
      await message.edit(content);
    } else {
      throw new Error();
    }
  } catch(err) {
    const message = await channel.send(content);
    message.pin();
    await saveCounterMessageID(message.id, cream);
  }
}

export async function announceCounterUpdate(bot: Client, member: GuildMember, delta: number, cream: boolean) {
  const channel = await bot.channels.fetch(getChannel(cream)) as TextChannel;

  const embed = new MessageEmbed()
    .setAuthor(`${member.user.username}#${member.user.discriminator}`, member.user.displayAvatarURL())
    .setDescription(`**${member.toString()}** has ${delta > 0 ? 'increased' : 'decreased'} the counter by **${Math.abs(delta)}**.`)
    .setColor(member.displayColor)
    .setTimestamp()
    .setFooter(`[${getEmoji(cream)}] x${counter}`);

  await channel.send({
    embeds: [embed]
  });
}

export async function changeCounterInteraction(interaction: CommandInteraction, member: GuildMember, amount: number, cream: boolean) {
  const newCount = await changeCounter(amount, cream);
  await updateCounter(interaction.client, cream);
  await announceCounterUpdate(interaction.client, member, amount, cream);
  interaction.followUp({
    content: `${getEmoji(cream)} **You have ${amount > 0 ? 'increased' : 'decreased'} the counter.**\n\`\`\`diff\n ${newCount - amount}\n${getSign(amount)}${Math.abs(amount)}\n ${newCount}\`\`\``
  });
}