extract evepraisal from apraisal

src/market/appraisal/appraisal.ts

@@ -0,0 +1,44 @@
+import { defineStore } from 'pinia';
+import { ref } from 'vue';
+import { MarketType } from "../type";
+import { MarketTypePrice } from './MarketTypePrice';
+import { getEvepraisalPrices } from './evepraisal';
+
+type MarketTypePriceCache = {
+    price: MarketTypePrice,
+    date: Date
+}
+
+const cacheDuration = 1000 * 60 * 5; // 5 minutes
+
+export const useApraisalStore = defineStore('appraisal', () => {
+    const cache = ref<Record<number, MarketTypePriceCache>>({});
+
+    const getPricesUncached = getEvepraisalPrices;
+
+    const getPrice = async (type: MarketType): Promise<MarketTypePrice> => (await getPrices([type]))[0];
+    const getPrices = async (types: MarketType[]): Promise<MarketTypePrice[]> => {
+        const now = new Date();
+        const cached: MarketTypePrice[] = [];
+        const uncached: MarketType[] = [];
+
+        types.forEach(t => {
+            const cachedPrice = cache.value[t.id];
+
+            if (cachedPrice && now.getTime() - cachedPrice.date.getTime() < cacheDuration) {
+                cached.push(cachedPrice.price);
+            } else {
+                uncached.push(t);
+            }
+        });
+
+        if (uncached.length > 0) {
+            const prices = await getPricesUncached(uncached);
+
+            prices.forEach(p => cache.value[p.type.id] = { price: p, date: now });
+            return [...cached, ...prices];
+        }
+        return cached;
+    };
+    return { getPrice, getPrices };
+});