1 files changed, 86 insertions, 0 deletions
diff --git a/nodejs/lib/systems.ts b/nodejs/lib/systems.ts
new file mode 100644
index 0000000..94ebab7
--- /dev/null
+++ b/nodejs/lib/systems.ts
@@ -0,0 +1,86 @@
+import * as api from './api.js';
+import * as dbMarkets from '../database/markets.js';
+import * as dbShips from '../database/ships.js';
+import * as dbSystems from '../database/systems.js';
+import * as utils from './utils.js';
+
+// Retrieves a marketplace's market data for waypointSymbol
+export async function market(waypointSymbol: string) {
+    const data = dbMarkets.getMarketAtWaypoint(waypointSymbol);
+    if (data === null) {
+		if (dbShips.getShipsAt(waypointSymbol) === null) {
+			return null;
+		}
+		const systemSymbol = utils.systemFromWaypoint(waypointSymbol);
+		let d = await api.send({endpoint: `/systems/${systemSymbol}/waypoints/${waypointSymbol}/market`});
+		delete d.data.transactions;
+		dbMarkets.setMarket(d.data);
+		return d;
+    }
+    return data;
+}
+
+// Retrieves a shipyard's information for ctx.symbol
+export async function shipyard(ctx) {
+	const systemSymbol = utils.systemFromWaypoint(ctx.symbol);
+	return await api.send({endpoint: `/systems/${systemSymbol}/waypoints/${ctx.symbol}/shipyard`});
+}
+
+// Retrieves the system's information for ctx.symbol and caches it in the database
+export async function system(ctx) {
+	let s = dbSystems.getSystem(ctx.symbol);
+	if (s === null) {
+		const response = await api.send({endpoint: `/systems/${ctx.symbol}`});
+		if (response.error !== undefined) {
+			switch(response.error.code) {
+				case 404:
+					throw `Error retrieving info for system ${ctx.symbol}: ${response.error.message}`;
+				default: // yet unhandled error
+					throw response;
+			}
+		}
+		s = response.data;
+		dbSystems.setSystem(s);
+	}
+	return s;
+}
+
+// Retrieves a list of waypoints that have a specific ctx.trait like a SHIPYARD or a MARKETPLACE in the system ctx.symbol
+export async function trait(ctx) {
+	const w = await waypoints(ctx);
+	return w.filter(s => s.traits.some(t => t.symbol === ctx.trait));
+}
+
+// Retrieves a list of waypoints that have a specific ctx.type like ASTEROID_FIELD in the system ctx.symbol
+export async function type(ctx, response) {
+	const w = await waypoints(ctx);
+	return w.filter(s => s.type === ctx.type);
+}
+
+// Retrieves the system's information for ctx.symbol and caches it in the database
+export async function waypoints(ctx) {
+	await system(ctx);
+	let updated = dbSystems.getSystemUpdated(ctx.symbol);
+	// TODO handle uncharted systems
+	if (updated === null) {
+		let waypoints = [];
+		for (let page=1; true; ++page) {
+			const response = await api.send({endpoint: `/systems/${ctx.symbol}/waypoints?limit=20&page=${page}`, priority: 98});
+			if (response.error !== undefined) {
+				switch(response.error.code) {
+					case 404:
+						throw `Error retrieving waypoints for system ${ctx.symbol}: ${response.error.message}`;
+					default: // yet unhandled error
+						throw response;
+				}
+			}
+			waypoints = waypoints.concat(response.data);
+			if (response.meta.total <= response.meta.limit * page) {
+				break;
+			}
+		}
+		dbSystems.setSystemWaypoints(ctx.symbol, waypoints);
+		return waypoints;
+	}
+	return dbSystems.getSystem(ctx.symbol).waypoints;
+}