import { InitHealth, InvincibleUser, ItemInventory, db } from '../db';
import { DefaultItems, getDefaultItem, giveItem, getItemQuantity, formatItems } from './items';
import { Client } from 'discord.js';

export const BLOOD_ID = -DefaultItems.BLOOD;
export const BLOOD_ITEM = getDefaultItem(BLOOD_ID);
export const MAX_HEALTH = BLOOD_ITEM.maxStack;
const BLOOD_GAIN_PER_HOUR = 2;
export const INVINCIBLE_TIMER = 1_000 * 60 * 30;

export async function initHealth(user: string) {
  const isInitialized = await db<InitHealth>('initHealth')
    .where('user', user)
    .first();
  
  if (!isInitialized) {
    giveItem(user, BLOOD_ITEM, MAX_HEALTH);
    await db<InitHealth>('initHealth').insert({ user });
  }
}

export async function getInvincibleMs(user: string) {
  const invincible = await db<InvincibleUser>('invincibleUsers')
    .where('user', user)
    .first();

  if (!invincible) return 0;
  return Math.max((invincible.since + INVINCIBLE_TIMER) - Date.now(), 0);
}

export async function resetInvincible(user: string) {
  await db<InvincibleUser>('invincibleUsers')
    .where('user', user)
    .delete();
}

export async function applyInvincible(user: string) {
  const exists = await db<InvincibleUser>('invincibleUsers')
    .where('user', user)
    .first();

  if (exists) {
    await db<InvincibleUser>('invincibleUsers')
      .update({ since: Date.now() });
  } else {
    await db<InvincibleUser>('invincibleUsers')
      .insert({ since: Date.now(), user });
  }
}

export async function getHealth(user: string) {
  await initHealth(user);
  return await getItemQuantity(user, BLOOD_ID);
}

export async function dealDamage(user: string, dmg: number) {
  await initHealth(user);
  await applyInvincible(user);
  return await giveItem(user, BLOOD_ITEM, -dmg);
}

async function healthCron(bot: Client) {
  await db<ItemInventory>('itemInventories')
    .where('item', BLOOD_ID)
    .update({
      quantity: db.raw('MIN(quantity + ?, ?)', [BLOOD_GAIN_PER_HOUR, MAX_HEALTH])
    });

  const debtedUsers = await db<ItemInventory>('itemInventories')
    .select('user', 'quantity')
    .where('item', BLOOD_ID)
    .where('quantity', '<', '0');

  for (const debted of debtedUsers) {
    const user = await bot.users.fetch(debted.user);
    if (!user) continue;
    await user.send(`${formatItems(BLOOD_ITEM, debted.quantity)} You are bleeding out to death`);
  }
}

export function init(bot: Client) {
  healthCron(bot);
  setInterval(() => healthCron(bot), 1_000 * 60 * 60);
}