import { AutocompleteInteraction, User } from 'discord.js';
import { CustomItem, ItemInventory, db } from '../db';

export type DefaultItem = Omit<CustomItem, 'guild'>; // uses negative IDs
export type Item = DefaultItem | CustomItem;

export interface Behavior {
  name: string,
  description: string,
  itemType: 'plain' | 'weapon' | 'consumable',
  // triggers upon use
  // for 'weapons', this is on hit
  // for 'consumable', this is on use
  // for 'plain', ...??
  // returns `true` upon success, `false` otherwise
  action?: (item: Item, user: User) => Promise<boolean>
}

export interface Items {
  item: Item,
  quantity: number
}

const defaultFormatRecipe = (inputs: Items[], requirements: Items[], outputs: Items[]) =>
  `${formatItemsArray(inputs)}${requirements.length === 0 ? '' : ` w/ ${formatItemsArray(requirements)}`} => ${formatItemsArray(outputs)}`;

export interface CraftingStation {
  key: string,
  name: string,
  description: string,
  emoji: string,
  requires?: Item,
  // in seconds
  cooldown?: number,
  formatRecipe?: (inputs: Items[], requirements: Items[], outputs: Items[]) => string,
  manipulateResults?: (outputs: Items[]) => Items[]
}

export interface Recipe {
  station: string,
  inputs: Items[],
  requirements: Items[],
  outputs: Items[]
}

export async function getCustomItem(id: number) {
  return await db<CustomItem>('customItems')
    .where('id', id)
    .first();
}

export function getDefaultItem(id: DefaultItems): Item
export function getDefaultItem(id: number): Item | undefined {
  return defaultItems.find(item => Math.abs(item.id) === Math.abs(id));
}

export async function getItem(id: number): Promise<Item | undefined> {
  if (id >= 0) {
    return await getCustomItem(id);
  } else {
    return getDefaultItem(id);
  }
}

export async function getItemQuantity(user: string, itemID: number) {
  return (await db<ItemInventory>('itemInventories')
    .where('item', itemID)
    .where('user', user)
    .first())
  || {
    'user': user,
    'item': itemID,
    'quantity': 0
  };
}

export async function giveItem(user: string, item: Item, quantity = 1) {
  const storedItem = await db<ItemInventory>('itemInventories')
    .where('user', user)
    .where('item', item.id)
    .first();

  let inv;
  if (storedItem) {
    inv = await db<ItemInventory>('itemInventories')
      .update({
        'quantity': db.raw('MIN(quantity + ?, ?)', [quantity, getMaxStack(item)])
      })
      .limit(1)
      .where('user', user)
      .where('item', item.id)
      .returning('*');
  } else {
    inv = await db<ItemInventory>('itemInventories')
      .insert({
        'user': user,
        'item': Math.min(item.id, getMaxStack(item)),
        'quantity': quantity
      })
      .returning('*');
  }

  return inv[0];
}

export function getMaxStack(item: Item) {
  return item.type === 'weapon' ? 1 : item.maxStack;
}

export function formatItem(item: Item | undefined) {
  if (!item) return '? **MISSINGNO**';
  return `${item.emoji} **${item.name}**`;
}
export function formatItems(item: Item | undefined, quantity: number) {
  return `${quantity}x ${formatItem(item)}`;
}
export function formatItemsArray(items: Items[]) {
  return items.map(i => formatItems(i.item, i.quantity)).join(' ');
}

export async function itemAutocomplete(interaction: AutocompleteInteraction) {
  const focused = interaction.options.getFocused();

  const customItems = await db<CustomItem>('customItems')
    .select('emoji', 'name', 'id')
    // @ts-expect-error this LITERALLY works
    .whereLike(db.raw('UPPER(name)'), `%${focused.toUpperCase()}%`)
    .where('guild', interaction.guildId!)
    .limit(25);

  const foundDefaultItems = defaultItems.filter(item => item.name.toUpperCase().includes(focused.toUpperCase()));

  const items = [...foundDefaultItems, ...customItems];

  await interaction.respond(
    items.map(choice => ({ name: `${choice.emoji} ${choice.name}`, value: choice.id.toString() }))
  );
}