[javascript] Implement the selling loop of the contracting automation

nodejs/automation/selling.js

@@ -0,0 +1,76 @@
+import * as dbMarkets from '../database/markets.js';
+import * as dbShips from '../database/ships.js';
+import * as api from '../lib/api.js';
+import * as libShips from '../lib/ships.js';
+import * as libSystems from '../lib/systems.js';
+import * as utils from '../lib/utils.js';
+
+// example ctx { ship: {XXX}, keep: 'SILVER_ORE' }
+export async function sell(ship, keep) {
+    outer: while(true) {
+	// first lets see what we want to sell
+	let cargo = utils.categorizeCargo(ship.cargo, keep);
+	// get the marketdata from our location
+	const market = await libSystems.market(ship.nav.waypointSymbol);
+	// can we sell anything here?
+	const goods = whatCanBeTradedAt(cargo.goods, market.imports.concat(market.exchange));
+	for (let i = 0; i < goods.length; i++) {
+	    const symbol = goods[i].symbol;
+	    await libShips.sell({
+		good: symbol,
+		symbol: ship.symbol,
+		units: cargo.goods[symbol],
+	    });
+	    delete cargo.goods[symbol];
+	};
+	// are we done selling everything we can?
+	ship = dbShips.getShip(ship.symbol);
+	cargo = utils.categorizeCargo(ship.cargo, keep);
+	if (Object.keys(cargo.goods).length === 0) {
+	    return;
+	}
+	// we need to move somewhere else to sell our remaining goods
+	// first we look into markets in our system
+	const rawMarkets = await libSystems.trait({symbol: ship.nav.systemSymbol, trait: 'MARKETPLACE'});
+	// sorted by distance from where we are
+	const markets = rawMarkets.map(function (m) { return {
+	    data: m,
+	    distance: (m.x - ship.nav.route.destination.x) ** 2 + (m.y - ship.nav.route.destination.y) ** 2,
+	}});
+	markets.sort(function(a, b) {
+	    if (a.distance < b.distance) {
+		return -1;
+	    } else if (a.distance > b.distance) {
+		return 1;
+	    }
+	    return 0;
+	});
+	// check from the closest one if they import what we need to sell
+	for (let i = 0; i < markets.length; i++) {
+	    const waypointSymbol = markets[i].data.symbol;
+	    const market = await libSystems.market(waypointSymbol);
+	    // if we have no data on the market we need to go there and see
+	    // and if we have data and can sell there we need to go too
+	    if (market === null || whatCanBeTradedAt(cargo.goods, market.imports).length > 0) {
+		await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
+		continue outer;
+	    }
+	}
+	// check from the closest one if they exchange what we need to sell
+	for (let i = 0; i < markets.length; i++) {
+	    const waypointSymbol = markets[i].data.symbol;
+	    const market = await libSystems.market(waypointSymbol);
+	    // if we can sell there we need to go
+	    if (whatCanBeTradedAt(cargo.goods, market.exchange).length > 0) {
+		await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
+		continue outer;
+	    }
+	}
+	throw new Error(`Ship {ship.symbol} has found no importing or exchanging market for its cargo in the system`);
+    }
+}
+
+function whatCanBeTradedAt(cargo, goods) {
+    if (goods === undefined) return [];
+    return goods.filter(g => cargo[g.symbol] !== undefined );
+}