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[node] fix shortest path to only hop through refueling points

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This commit is contained in:
Julien Dessaux 2024-05-05 00:08:28 +02:00
parent 063b2c9951
commit 5aac233c08
Signed by: adyxax
GPG key ID: F92E51B86E07177E
3 changed files with 26 additions and 14 deletions
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9
nodejs/automation/selling.ts
View file

@ -3,12 +3,9 @@ import * as libSystems from '../lib/systems.ts';
import {
categorizeCargo,
sortByDistanceFrom,
whatCanBeTradedAt,
} from '../lib/utils.ts';
import { Ship } from '../lib/ships.ts';
import {
CargoManifest,
CommonThing,
} from '../lib/types.ts';
// example ctx { ship: {XXX}, keep: 'SILVER_ORE' }
export async function sell(ship: Ship, good: string): Promise<Ship> {
@ -54,7 +51,3 @@ export async function sell(ship: Ship, good: string): Promise<Ship> {
throw new Error(`Ship {ship.symbol} has found no importing or exchanging market for its cargo in the system`);
}
}
function whatCanBeTradedAt(cargo: CargoManifest, goods: Array<CommonThing>): Array<CommonThing> {
return goods.filter(g => cargo[g.symbol] !== undefined );
}

2
nodejs/lib/ships.ts
View file

@ -103,7 +103,7 @@ export class Ship {
return this.cargo.units >= this.cargo.capacity * 0.9;
}
async navigate(waypoint: Waypoint): Promise<void> {
let path = shortestPath(await libSystems.waypoint(this.nav.route.destination.symbol), waypoint, this.fuel.capacity, await libSystems.waypoints(this.nav.systemSymbol));
let path = await shortestPath(await libSystems.waypoint(this.nav.route.destination.symbol), waypoint, this.fuel.capacity, await libSystems.waypoints(this.nav.systemSymbol));
while (path.length > 0) {
const next = path.pop();
if (next === undefined) break;

29
nodejs/lib/utils.ts
View file

@ -1,7 +1,14 @@
import {
debugLog,
} from './api.ts';
import { PriorityQueue } from './priority_queue.ts';
import {
market,
} from './systems.ts';
import {
Cargo,
CargoManifest,
CommonThing,
Waypoint,
} from './types.ts';
@ -53,7 +60,7 @@ export function sortByDistanceFrom<T extends Point>(a: Point, points: Array<T>):
type Step = {waypoint: Waypoint, prev: string, fuel: number, total: number};
type ShortestPath = Array<{symbol: string, fuel: number}>;
export function shortestPath(origin: Waypoint, destination: Waypoint, range: number, waypoints: Array<Waypoint>): ShortestPath {
export async function shortestPath(origin: Waypoint, destination: Waypoint, range: number, waypoints: Array<Waypoint>): Promise<ShortestPath> {
let backtrace: {[key: string]: Step} = {};
let fuels: {[key: string]: number} = {}; // fuel = distance + 1 per hop
let unvisited: {[key: string]: Waypoint} = {};
@ -69,7 +76,6 @@ export function shortestPath(origin: Waypoint, destination: Waypoint, range: num
const symbol = step.waypoint.symbol;
if (!(symbol in unvisited)) continue;
backtrace[symbol] = step;
if (symbol === destination.symbol) break;
const prev = unvisited[symbol];
delete unvisited[symbol];
for(const ws in unvisited) {
@ -79,13 +85,22 @@ export function shortestPath(origin: Waypoint, destination: Waypoint, range: num
const total = step.fuel + f;
if (fuels[ws] > total) {
fuels[ws] = total;
queue.enqueue({waypoint: w, prev: symbol, fuel: f, total: total}, total);
const nextStep = {waypoint: w, prev: symbol, fuel: f, total: total};
if (ws === destination.symbol) {
backtrace[ws] = nextStep;
break;
}
if (!w.traits.some(t => t.symbol === 'MARKETPLACE')) continue;
const m = await market(w);
if (whatCanBeTradedAt({"FUEL":1}, m.exports.concat(m.exchange)).length === 0) continue;
queue.enqueue(nextStep, total);
}
}
}
let result: ShortestPath = [];
for (let step = backtrace[destination.symbol]; step.waypoint.symbol != origin.symbol; step = backtrace[step.prev]) {
if (step === undefined) throw `Cannot compute shortest path from ${origin.symbol} to ${destination.symbol} with range ${range}.`;
let step = backtrace[destination.symbol];
if (step === undefined) throw `Cannot compute shortest path from ${origin.symbol} to ${destination.symbol} with range ${range}.`;
for (; step.waypoint.symbol != origin.symbol; step = backtrace[step.prev]) {
result.push({symbol: step.waypoint.symbol, fuel: step.fuel});
}
return result;
@ -94,3 +109,7 @@ export function shortestPath(origin: Waypoint, destination: Waypoint, range: num
export function systemFromWaypoint(waypoint: string): string {
return waypoint.split('-').slice(0,2).join('-');
}
export function whatCanBeTradedAt(cargo: CargoManifest, goods: Array<CommonThing>): Array<CommonThing> {
return goods.filter(g => cargo[g.symbol] !== undefined );
}