mancala/apps/backend/tests/game/fakes.ts

import { FinishedGameSummary, GameRecord } from "@mancala/core";
import { GameHistoryRepository } from "../../src/history/GameHistoryRepository";
import { LiveGameStore } from "../../src/live/LiveGameStore";
import { Cache } from "../../src/cache/Cache";

export class InMemoryLiveGameStore implements LiveGameStore {
    readonly games = new Map<string, unknown>();
    readonly pending = new Map<string, GameRecord>();
    failing = false;

    private check() {
        if (this.failing) return Promise.reject(new Error("Valkey is down"));
        return Promise.resolve();
    }

    async saveGame(gameId: string, snapshot: unknown) {
        await this.check();
        this.games.set(gameId, JSON.parse(JSON.stringify(snapshot)));
    }
    async removeGame(gameId: string) {
        await this.check();
        this.games.delete(gameId);
    }
    async loadGames() {
        await this.check();
        return [...this.games.values()];
    }
    async savePendingRecord(record: GameRecord) {
        await this.check();
        this.pending.set(record.id, record);
    }
    async removePendingRecord(gameId: string) {
        await this.check();
        this.pending.delete(gameId);
    }
    async loadPendingRecords() {
        await this.check();
        return [...this.pending.values()];
    }
}

// Lists leave out the moves, like the Postgres repository.
const toSummary = ({ moves, totalSpectators, ...summary }: GameRecord): FinishedGameSummary => summary;

export class InMemoryGameHistoryRepository implements GameHistoryRepository {
    readonly records = new Map<string, GameRecord>();
    failing = false;

    async save(record: GameRecord) {
        if (this.failing) throw new Error("database is down");
        if (!this.records.has(record.id)) this.records.set(record.id, record);
    }
    async get(id: string) {
        if (this.failing) throw new Error("database is down");
        return this.records.get(id);
    }
    async getRecentForUser(userId: string, limit: number): Promise<FinishedGameSummary[]> {
        return [...this.records.values()]
            .filter((r) => r.player1.userId === userId || r.player2.userId === userId)
            .sort((a, b) => b.endedAt - a.endedAt).slice(0, limit).map(toSummary);
    }
    async getPopular(limit: number): Promise<FinishedGameSummary[]> {
        return [...this.records.values()]
            .sort((a, b) => b.peakSpectators - a.peakSpectators || b.endedAt - a.endedAt).slice(0, limit).map(toSummary);
    }
}

// Lets fire-and-forget promises (saving to Valkey or the database) settle.
export const flushPromises = () => new Promise((resolve) => setImmediate(resolve));

export class InMemoryCache implements Cache {
    readonly values = new Map<string, unknown>();
    async getJson<T>(key: string) {
        return this.values.get(key) as T | undefined;
    }
    async setJson(key: string, value: unknown) {
        this.values.set(key, JSON.parse(JSON.stringify(value)));
    }
    async delete(...keys: string[]) {
        keys.forEach((key) => this.values.delete(key));
    }
}