78 lines
2.5 KiB
TypeScript
78 lines
2.5 KiB
TypeScript
import { giveItem, type Item, isDefaultItem } from './items';
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import { Either, Left } from '../util';
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import { ItemBehavior, db } from '../db';
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import { BLOOD_ITEM, dealDamage } from './pvp';
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export interface Behavior {
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name: string,
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description: string,
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itemType: 'plain' | 'weapon' | 'consumable',
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// make it look fancy
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format?: (value: number) => string,
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// triggers upon use
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// for 'weapons', this is on attack
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// for 'consumable' and `plain`, this is on use
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// returns Left upon success, the reason for failure otherwise (Right)
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onUse?: (value: number, item: Item, user: string) => Promise<Either<null, string>>,
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// triggers upon `weapons` attack
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// returns the new damage value upon success (Left), the reason for failure otherwise (Right)
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onAttack?: (value: number, item: Item, user: string, target: string, damage: number) => Promise<Either<number, string>>,
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}
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export const behaviors: Behavior[] = [
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{
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name: 'heal',
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description: 'Heals the user by `value`',
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itemType: 'consumable',
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async onUse(value, item, user) {
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await dealDamage(user, -Math.floor(value));
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return new Left(null);
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},
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},
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{
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name: 'damage',
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description: 'Damages the user by `value',
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itemType: 'consumable',
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async onUse(value, item, user) {
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await dealDamage(user, Math.floor(value));
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return new Left(null);
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},
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},
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{
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name: 'random_up',
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description: 'Randomizes the attack value up by a maximum of `value`',
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itemType: 'weapon',
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format: (value) => `random +${value}`,
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async onAttack(value, item, user, target, damage) {
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return new Left(damage + Math.round(Math.random() * value));
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},
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},
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{
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name: 'random_down',
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description: 'Randomizes the attack value down by a maximum of `value`',
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itemType: 'weapon',
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format: (value) => `random -${value}`,
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async onAttack(value, item, user, target, damage) {
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return new Left(damage - Math.round(Math.random() * value));
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},
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},
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{
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name: 'lifesteal',
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description: 'Gain blood by stabbing your foes, scaled by `value`x',
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itemType: 'weapon',
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format: (value) => `lifesteal: ${value}x`,
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async onAttack(value, item, user, target, damage) {
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giveItem(user, BLOOD_ITEM, Math.floor(damage * value));
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return new Left(damage);
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},
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}
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];
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export async function getBehaviors(item: Item) {
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if (isDefaultItem(item)) {
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return item.behaviors || [];
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} else {
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return await db<ItemBehavior>('itemBehaviors')
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.where('item', item.id);
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}
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} |