src/mlpccg/draft/bot.ts

@@ -1,7 +1,15 @@
 import { Card } from "@/mlpccg";
+import { SessionPlayer } from "./session";
 
 export class DraftBot {
-  pick(picks: Card[]) {
+  assign(player: SessionPlayer) {
+    player.on("available-picks", cards => {
+      const pick = this.pick(cards);
+      setTimeout(() => player.pick(pick.ID), 0);
+    });
+  }
+
+  pick(picks: Card[]): Card {
     // For now, pick a random card
     const idx = Math.floor(Math.random() * picks.length);
     return picks[idx];

src/mlpccg/draft/provider.ts

@@ -0,0 +1,34 @@
+import { DraftSchema, Pack } from "./types";
+import { PackBuilder } from "./booster";
+
+export class DraftProvider {
+  private schema: DraftSchema;
+
+  constructor(schema: DraftSchema) {
+    this.schema = schema;
+  }
+
+  getPacks(): Pack[] {
+    let out = [];
+    for (const boosterSlot in this.schema.boosters) {
+      const amount = this.schema.boosters[boosterSlot];
+      const factory = this.schema.factories[boosterSlot];
+      if (!factory) {
+        throw new Error(
+          `booster type ${boosterSlot} was referenced in schema but was not provided a builder`
+        );
+      }
+      for (let i = 0; i < amount; i++) {
+        out.push(factory.buildPack());
+      }
+    }
+    return out;
+  }
+
+  static set(factory: PackBuilder, amount: number): DraftProvider {
+    return new DraftProvider({
+      boosters: { normal: amount },
+      factories: { normal: factory }
+    });
+  }
+}

src/mlpccg/draft/session.ts

@@ -1,55 +1,78 @@
 import { PackBuilder, Cube, DraftOptions } from ".";
 import EventEmitter from "eventemitter3";
 import { Card } from "@/mlpccg";
+import { Pack, Direction } from "./types";
+import { DraftProvider } from "./provider";
+import { DraftBot } from "./bot";
 
-export class Session {
+export class Session extends EventEmitter {
   private options: DraftOptions;
-  private factory: PackBuilder;
-  private pod: SessionPlayer[];
-  private players: string[];
-  private pending: number[];
+  private provider: DraftProvider;
+  private pod: SessionPlayer[] = [];
+  private players: string[] = [];
+  private pending: number[] = [];
+  private assigned: boolean = false;
+  private direction: Direction = "cw";
 
-  constructor(options: DraftOptions, factory: PackBuilder) {
+  constructor(options: DraftOptions, provider: DraftProvider) {
+    super();
     this.options = options;
-    this.factory = factory;
-    this.players = [];
-    this.pending = [];
+    this.provider = provider;
     this.pod = new Array(options.players).fill(0).map((x, i) => {
-      const player = new SessionPlayer();
+      const player = new SessionPlayer(provider.getPacks());
       player.on("pick", this.picked.bind(this, i));
       return player;
     });
+    // Populate prev/next references
+    this.pod.forEach((val, i) => {
+      if (i > 0) {
+        val.prev = this.pod[i - 1];
+      } else {
+        val.prev = this.pod[this.pod.length - 1];
+      }
+      if (i < this.pod.length - 1) {
+        val.next = this.pod[i + 1];
+      } else {
+        val.next = this.pod[0];
+      }
+    });
   }
 
-  public start() {
+  public assign(
+    players: string[],
+    assignFn: (name: string, instance: SessionPlayer) => void
+  ) {
     // Figure out how many players there are vs spots to be filled
+    this.players = players;
     const spots = this.options.players;
-    const players = this.players.length;
-    if (players > spots) {
+    const playerNum = players.length;
+    if (playerNum > spots) {
       throw new Error("too many players in the pod");
     }
 
-    if (players < 1) {
+    if (playerNum < 1) {
       throw new Error("not enough players");
     }
 
     // Place players in the pod
     switch (this.options.spacing) {
       case "evenly":
-        const playerRatio = spots / players;
+        const playerRatio = spots / playerNum;
         let i = 0;
-        for (const player of this.players) {
+        for (const player of players) {
           const pos = Math.floor(playerRatio * i);
-          this.pod[pos].name = name;
+          this.pod[pos].name = player;
+          assignFn(player, this.pod[pos]);
           i += 1;
         }
         break;
       case "randomly":
-        for (const player of this.players) {
+        for (const player of players) {
           while (true) {
             const idx = Math.floor(Math.random() * spots);
-            if (!this.pod[idx].name) {
+            if (this.pod[idx].name == "") {
               this.pod[idx].name = player;
+              assignFn(name, this.pod[idx]);
               break;
             }
           }
@@ -57,26 +80,86 @@ export class Session {
         break;
     }
 
-    //TODO
+    // All the non-assigned places go to bots!
+    this.pod.forEach(p => {
+      if (p.name == "") {
+        p.name = "bot";
+        const bot = new DraftBot();
+        bot.assign(p);
+      }
+    });
+
+    this.assigned = true;
+  }
+
+  public start() {
+    if (!this.assigned) {
+      throw new Error("Must assign players first (see assign())");
+    }
+    this.emit("start", this.order);
+    this.nextPack();
   }
 
   public get order(): string[] {
-    return this.pod.map(p => p.name || "bot");
+    return this.pod.map(p => p.name);
   }
 
-  private picked(playerIndex: number, card: string) {
+  private picked(
+    playerIndex: number,
+    _card: string,
+    lastPick: boolean,
+    lastPack: boolean
+  ) {
     if (!this.pending.includes(playerIndex)) {
       // Uh oh.
       throw new Error(
-        `unexpected pick: player #${playerIndex} already picked their card`
+        `unexpected pick: player "${this.pod[playerIndex].name}" already picked their card`
       );
     }
     const idx = this.pending.indexOf(playerIndex);
     this.pending.splice(idx, 1);
-    // Check if everyone picked their card
-    if (this.pending.length < 1) {
-      //TODO
-      //NEXT PACK
+
+    this.emit("player-pick", this.pod[playerIndex].name);
+
+    // Don't continue unless everyone picked their card
+    if (this.pending.length > 0) {
+      return;
+    }
+
+    // Was this the last pick for this round of packs?
+    if (lastPick) {
+      // Was the it the last pack?
+      if (lastPack) {
+        this.emit("draft-over");
+        this.pod.forEach(p => p.emit("your-picks", p.picks));
+        return;
+      }
+      this.nextPack();
+      return;
+    }
+
+    // Pass packs between players for next pick
+    this.resetPending();
+    this.pod.forEach(p => p.sendPack(this.direction));
+    this.emit("next-pick");
+  }
+
+  private nextPack() {
+    this.resetPending();
+    this.flipOrder();
+    this.pod.forEach(p => p.nextPack());
+    this.emit("next-pack");
+  }
+
+  private resetPending() {
+    this.pending = this.pod.map((_, i) => i);
+  }
+
+  private flipOrder() {
+    if (this.direction == "cw") {
+      this.direction = "ccw";
+    } else {
+      this.direction = "cw";
     }
   }
 
@@ -84,14 +167,16 @@ export class Session {
     switch (options.source) {
       case "set": {
         const factory = await PackBuilder.fromSet(options.set);
-        return new Session(options, factory);
+        const provider = DraftProvider.set(factory, options.packs);
+        return new Session(options, provider);
       }
       case "block":
         throw new Error("not implemented");
       case "cube": {
         const cube = await Cube.fromURL(options.url);
         const factory = new PackBuilder(cube.schema());
-        return new Session(options, factory);
+        const provider = DraftProvider.set(factory, options.packs);
+        return new Session(options, provider);
       }
       case "i8pcube":
         throw new Error("not implemented");
@@ -102,17 +187,73 @@ export class Session {
 }
 
 export class SessionPlayer extends EventEmitter {
-  public name?: string;
-  public currentPack?: Card[];
+  public name: string = "";
+  public currentPack?: Pack;
+  public picks: Pack;
+  public packs: Pack[];
+  public toSend: Pack | null = null;
   public next?: SessionPlayer;
+  public prev?: SessionPlayer;
+  public ready: boolean = false;
+
+  constructor(packs: Pack[]) {
+    super();
+    this.packs = packs;
+    this.picks = [];
+  }
 
   public pick(card: string) {
+    if (!this.ready) {
+      throw new Error("not ready to pick");
+    }
     if (!this.currentPack) {
       throw new Error("no pack to pick from");
     }
-    if (!this.currentPack.find(c => c.ID == card)) {
+    const idx = this.currentPack.findIndex(c => c.ID == card);
+    if (idx < 0) {
       throw new Error("card not in available picks");
     }
-    this.emit("pick", card);
+    const pick = this.currentPack.splice(idx, 1);
+    this.picks.push(pick[0]);
+    this.toSend = this.currentPack;
+    this.ready = false;
+
+    this.emit("pick", card, this.currentPack.length < 1, this.packs.length < 1);
+  }
+
+  public sendPack(direction: Direction) {
+    if (!this.toSend) {
+      throw new Error("no pack to pass");
+    }
+    if (this.toSend.length < 1) {
+      throw new Error("empty pack");
+    }
+    if (direction == "cw") {
+      if (!this.next) {
+        throw new Error("no player to pass cards to");
+      }
+      this.next.receivePack(this.toSend);
+    } else {
+      if (!this.prev) {
+        throw new Error("no player to pass cards to");
+      }
+      this.prev.receivePack(this.toSend);
+    }
+    this.toSend = null;
+  }
+
+  public receivePack(cards: Pack) {
+    this.currentPack = cards;
+    this.ready = true;
+    this.emit("available-picks", cards);
+  }
+
+  public nextPack() {
+    // Open new pack
+    const newPack = this.packs.shift();
+    if (!newPack) {
+      throw new Error("no packs left");
+    }
+    this.receivePack(newPack);
   }
 }

src/mlpccg/draft/types.ts

@@ -1,4 +1,5 @@
 import { Card } from "@/mlpccg";
+import { PackBuilder } from "./booster";
 
 export type Provider = Iterator<Card>;
 
@@ -63,3 +64,10 @@ export interface SessionOptions {
 }
 
 export type DraftOptions = SessionOptions & LimitedGameType & DraftType;
+
+export interface DraftSchema {
+  boosters: Record<string, number>;
+  factories: Record<string, PackBuilder>;
+}
+
+export type Direction = "cw" | "ccw";

src/tests/unit/draft.spec.ts

@@ -1,9 +1,24 @@
-import { setupIDBShim } from "@/testing";
+import { setupIDBShim, EventHook } from "@/testing";
 import { initDB, loadSets, Database } from "@/mlpccg";
-import { PackBuilder, spanByRarity, Cube } from "@/mlpccg/draft";
+import {
+  PackBuilder,
+  spanByRarity,
+  Cube,
+  Session,
+  DraftOptions
+} from "@/mlpccg/draft";
 
 setupIDBShim();
 
+const testSessionOptions: DraftOptions = {
+  type: "booster-draft",
+  source: "set",
+  set: "FF",
+  packs: 2,
+  players: 4,
+  spacing: "evenly"
+};
+
 describe("mlpccg/draft", () => {
   beforeAll(async () => {
     jest.setTimeout(15000);
@@ -36,4 +51,47 @@ describe("mlpccg/draft", () => {
     const sortedPack = pack.map(c => c.ID).sort();
     expect(sortedPack).toEqual(cubeCards);
   });
+
+  test("A session can be initialized", async () => {
+    expect(Database).toBeTruthy();
+    const session = await Session.create(testSessionOptions);
+    const hook = new EventHook();
+    hook.hookEmitter(session, "start", "session-start");
+    session.assign(["test1", "test2"], () => {
+      // Do nothing
+    });
+    session.start();
+    await hook.expect("session-start");
+  });
+
+  test("Players receive pick events and can pick cards", async () => {
+    expect(Database).toBeTruthy();
+    const session = await Session.create(testSessionOptions);
+    const hook = new EventHook();
+    hook.hookEmitter(session, "start", "session-start");
+    hook.hookEmitter(session, "next-pack", "session-new-pack");
+    hook.hookEmitter(session, "next-pick", "session-new-pick");
+    hook.hookEmitter(session, "player-pick", "session-picked");
+    hook.hookEmitter(session, "draft-over", "session-done");
+    session.assign(["test1", "test2"], (name, player) => {
+      player.on("available-picks", cards => {
+        // setTimeout hack to avoid handlers being called before the rest of the code
+        setTimeout(() => player.pick(cards[0].ID), 0);
+      });
+    });
+    session.start();
+    await hook.expect("session-start");
+    for (let i = 0; i < testSessionOptions.packs; i++) {
+      await hook.expect("session-new-pack");
+      for (let j = 0; j < 12; j++) {
+        for (let p = 0; p < testSessionOptions.players; p++) {
+          await hook.expect("session-picked");
+        }
+        if (i < testSessionOptions.packs - 1) {
+          await hook.expect("session-new-pick");
+        }
+      }
+    }
+    await hook.expect("session-done");
+  });
 });