scottohara/loot

import type { OgCacheEntry } from "~/og-components/og-lru-cache-factory/types";

export default class OgLruCache {
    public constructor(
        private readonly capacity: number,
        private items: OgCacheEntry[],
    ) {}

    // List the cached items in order (MRU)
    public get list(): OgCacheEntry[] {
        return this.items;
    }

    // Put an item into the cache
    public put(item: OgCacheEntry): OgCacheEntry[] {
        // Exit early if the item is already the current head
        if (this.items.length && Number(this.items[0].id) === Number(item.id)) {
            return this.items;
        }

        this.items = [item, ...this.remove(Number(item.id))].slice(
            0,
            this.capacity,
        );

        return this.list;
    }

    // Remove an item from the cache
    public remove(id: number): OgCacheEntry[] {
        // Check if the item is in the cache
        const index = this.items.findIndex((item): boolean => item.id === id);

        if (index !== -1) {
            // Remove the item
            this.items.splice(index, 1);
        }

        return this.list;
    }
}