feat: core chunk 5

src/core/blitzkrieg/context.ts

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+type Context = 'website' | 'bot';
+
+export const context: Context =
+  typeof window === 'undefined' ? 'bot' : 'website';

src/core/blitzkrieg/filtersToDescription.ts

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+import { TREE_TYPE_NAMES } from '../../components/Tanks';
+import resolveTankName from '../blitz/resolveTankName';
+import {
+  TIER_ROMAN_NUMERALS,
+  Tier,
+  tankopediaInfo,
+} from '../blitzstars/tankopedia';
+import { StatFilters } from '../statistics/filterStats';
+
+export async function filtersToDescription({
+  nation,
+  tier,
+  tankType,
+  treeType,
+  tank,
+}: StatFilters) {
+  const awaitedTankopediaInfo = await tankopediaInfo;
+  const info: string[] = [];
+
+  if (tank) return await resolveTankName(tank);
+  if (nation) info.push(awaitedTankopediaInfo.vehicle_nations[nation]);
+  if (tier) info.push(`Tier ${TIER_ROMAN_NUMERALS[tier as Tier]}`);
+  if (tankType) info.push(awaitedTankopediaInfo.vehicle_types[tankType]);
+  if (treeType) info.push(TREE_TYPE_NAMES[treeType]);
+
+  return info.length === 0 ? 'No filters' : info.join(', ');
+}

src/core/blitzkrieg/getPeriodNow.ts

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+export default function getPeriodNow() {
+  return Date.now() / 1000;
+}

src/core/blitzkrieg/getPeriodStart.ts

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+import { PeriodSize } from '../../LEGACY_core/discord/addPeriodSubCommands';
+import { Region } from '../../constants/regions';
+import getTimeDaysAgo from './getTimeDaysAgo';
+
+export default function getPeriodStart(region: Region, period: PeriodSize) {
+  if (period === 'career') return 0;
+  if (period === 'today') return getTimeDaysAgo(region, 1);
+  return getTimeDaysAgo(region, parseInt(period));
+}

src/core/blitzkrieg/getTankHistories.ts

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+import { Region } from '../../constants/regions';
+import {
+  GetHistoriesOptions,
+  Histories,
+  History,
+  getHistoriesDefaultOptions,
+} from '../../types/histories';
+import getTankStats from '../blitz/getTankStats';
+import { emptyAllStats } from '../blitzstars/getStatsInPeriod';
+
+export interface TankHistory extends History {
+  tank_id: number;
+}
+
+export type TankHistories = TankHistory[];
+
+export interface TankHistoryRaw extends TankHistory {
+  mark_of_mastery: number;
+  battle_life_time: number;
+  account_id: number;
+}
+
+export type TankHistoriesRaw = TankHistoryRaw[];
+
+export interface GetTankHistoriesOptions extends GetHistoriesOptions {
+  tankId?: number;
+}
+
+export const getTankHistoriesDefaultOptions: GetTankHistoriesOptions = {
+  ...getHistoriesDefaultOptions,
+  tankId: undefined,
+};
+
+export default async function getTankHistories(
+  server: Region,
+  id: number,
+  options?: Partial<GetTankHistoriesOptions>,
+) {
+  const mergedOptions = { ...getTankHistoriesDefaultOptions, ...options };
+  const tankHistoriesResponse = await fetch(
+    `https://www.blitzstars.com/api/tankhistories/for/${id}/`,
+  );
+  const tankHistories = (
+    (await tankHistoriesResponse.json()) as TankHistoriesRaw
+  ).map(
+    (history) =>
+      ({
+        all: history.all,
+        last_battle_time: history.last_battle_time,
+        tank_id: history.tank_id,
+      }) satisfies TankHistory,
+  );
+  const compliantTanks: number[] = [];
+  const lastBattles: Record<number, number> = {};
+  const lastNonCompliantIndex: Record<number, number> = {};
+  const hasCompliedOnce: Record<number, boolean> = {};
+  const filtered = tankHistories.filter(
+    ({ last_battle_time, tank_id, all: { battles } }, index) => {
+      const complies =
+        last_battle_time >= mergedOptions.start &&
+        last_battle_time <= mergedOptions.end &&
+        (mergedOptions.tankId === undefined ||
+          tank_id === mergedOptions.tankId);
+
+      if (complies && !hasCompliedOnce[tank_id]) {
+        hasCompliedOnce[tank_id] = true;
+        compliantTanks.push(tank_id);
+      }
+      if (!hasCompliedOnce[tank_id]) lastNonCompliantIndex[tank_id] = index;
+      lastBattles[tank_id] = battles;
+
+      return complies;
+    },
+  );
+
+  const latestNodes: TankHistories = [];
+
+  if (mergedOptions.includeLatestHistories) {
+    (await getTankStats(server, id)).forEach((tankHistory) => {
+      if (
+        tankHistory.all.battles > (lastBattles[tankHistory.tank_id] ?? 0) &&
+        (mergedOptions.tankId === undefined ||
+          tankHistory.tank_id === mergedOptions.tankId)
+      ) {
+        if (!hasCompliedOnce[tankHistory.tank_id]) {
+          // was played today for the first time... I think???
+          hasCompliedOnce[tankHistory.tank_id] = true;
+          compliantTanks.push(tankHistory.tank_id);
+        }
+        latestNodes.push(tankHistory);
+      }
+    });
+  }
+
+  const previousNodes: TankHistories = [];
+
+  if (mergedOptions.includePreviousHistories) {
+    compliantTanks.forEach((tankId) => {
+      if (tankId in lastNonCompliantIndex) {
+        previousNodes.push(
+          tankHistories[lastNonCompliantIndex[tankId]] ??
+            ({
+              all: emptyAllStats,
+              last_battle_time: -Infinity,
+              tank_id: tankId,
+            } satisfies TankHistory),
+        );
+      }
+    });
+  }
+
+  return [...previousNodes, ...filtered, ...latestNodes] satisfies Histories;
+}

src/core/blitzkrieg/getTimeDaysAgo.ts

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+import { Region } from '../../constants/regions';
+
+export const TIME_ZONE_MAPPINGS: Record<Region, number> = {
+  com: -5, // Central North American Time
+  eu: +1, // Central European Time
+  asia: +7, // Central Asia Standard Time
+};
+
+export default function getTimeDaysAgo(region: Region, daysAgo: number) {
+  const now = new Date();
+  if (daysAgo === 0) now.getTime() / 1000;
+
+  const time = new Date();
+
+  time.setUTCHours(-TIME_ZONE_MAPPINGS[region], 0, 0, 0);
+  if (time > now) time.setUTCDate(time.getUTCDate() - 1);
+  time.setUTCDate(time.getUTCDate() - daysAgo + 1);
+
+  return time.getTime() / 1000;
+}