From 31184c1cd4c03c94af6bd3e05ffb3c59e2555abc Mon Sep 17 00:00:00 2001
From: Hide_D <hided62@gmail.com>
Date: Sat, 9 Mar 2024 07:41:06 +0000
Subject: [PATCH] feat: gameengine(wip)

---
 @sammo/server/src/GameEngine.ts | 192 +++++++++++++++++++++++++++++++-
 1 file changed, 187 insertions(+), 5 deletions(-)

diff --git a/@sammo/server/src/GameEngine.ts b/@sammo/server/src/GameEngine.ts
index f545e6f..4b80f6f 100644
--- a/@sammo/server/src/GameEngine.ts
+++ b/@sammo/server/src/GameEngine.ts
@@ -1,16 +1,139 @@
+import { Signal, delay, must, must_err } from "@sammo/util";
 import Denque from "denque";
+import { ResourceController } from "./ResourceController.js";
+import { entriesWithType } from "@sammo/util/converter";
+
+export interface ActionQueueItem {
+    waiterSeq: number;
+}
+
+export interface ActionQueueItemResult {
+    success: boolean;
+    reason?: string;
+    message?: string;
+}
 
 export class GameEngine {
 
     private static instance: GameEngine | null = null;
 
-    private npcActionQueue = new Denque<unknown>();
-    private apiActionQueue = new Denque<unknown>();
+    private actionSeq = 0;
+
+    private queueWaiters = new Map<number, [resolve: (result: unknown) => void, reject: (reason: unknown) => void]>();
+
+    private signal = new Signal(30000);
+
+    private actionQueue = {
+        server: new Denque<ActionQueueItem>(),
+        npc: new Denque<ActionQueueItem>(),
+        api: new Denque<ActionQueueItem>(),
+    } as const;
+
+    private rsc: ResourceController
 
     private constructor() {
-
+        this.rsc = new ResourceController();
     }
 
+    private continueRun = true;
+
+
+    private async gameLoop(): Promise<void> {
+        let generalWaitTimer: ReturnType<typeof setTimeout> | null = null;
+        let prevSaveWaiter: Promise<void> | null = null;
+        while (this.continueRun) {
+            //가장 빠른 장수
+            do {
+                const now = new Date();
+                const upcomingGeneral = this.rsc.upcomingGeneral();
+                if (!upcomingGeneral) {
+                    break;
+                }
+                const upcomingTurn = upcomingGeneral.raw.turntime;
+
+                const waitGeneralTurnMs = upcomingTurn.getTime() - now.getTime();
+                if (waitGeneralTurnMs > 0) {
+                    generalWaitTimer = setTimeout(() => {
+                        this.signal.notify();
+                    }, waitGeneralTurnMs);
+                }
+                else {
+                    this.signal.notify();
+                }
+            } while (0);
+
+            //이벤트를 대기
+            const waitResult = await this.signal.wait();
+            if (generalWaitTimer) {
+                clearTimeout(generalWaitTimer);
+            }
+            if (!this.continueRun) {
+                break;
+            }
+
+            const now = new Date();
+
+            let processedGeneralCount = 0;
+
+            while (true) {
+                //장수턴 부터 처리
+                const upcomingGeneral = this.rsc.upcomingGeneral();
+                if (!upcomingGeneral) {
+                    break;
+                }
+
+                if (upcomingGeneral.raw.turntime > now) {
+                    break;
+                }
+
+                //TODO: 턴 수행해야지!
+
+                upcomingGeneral.updateTurntime();
+                processedGeneralCount++;
+            }
+
+            if (processedGeneralCount > 0) {
+                await prevSaveWaiter;
+                prevSaveWaiter = this.rsc.saveAll();
+            }
+
+            //서버 이벤트 처리
+            for (const [invoker, queue] of entriesWithType(this.actionQueue)) {
+                let processEventCount = 0;
+
+                while (!queue.isEmpty()) {
+                    const action = must(queue.shift());
+
+                    //TODO: action 처리
+                    const errorReason: string | undefined = undefined;
+
+                    const [ticketResolve, ticketRejected] = must_err(
+                        this.queueWaiters.get(action.waiterSeq),
+                        Error, `GameEngine: waiterSeq(${action.waiterSeq}) not found`
+                    );
+
+                    this.queueWaiters.delete(action.waiterSeq);
+                    if (errorReason) {
+                        ticketRejected(errorReason);
+                    }
+                    else {
+                        ticketResolve({ success: true });
+                    }
+
+                    processEventCount++;
+                }
+
+                if (processEventCount > 0) {
+                    await prevSaveWaiter;
+                    prevSaveWaiter = this.rsc.saveAll();
+                }
+            }
+        }
+    }
+
+
+    private gameLoopPromise: Promise<void> | null = null;
+
     public static getInstance() {
         if (!GameEngine.instance) {
             GameEngine.instance = new GameEngine();
@@ -18,13 +141,72 @@ export class GameEngine {
         return GameEngine.instance;
     }
 
-    public async start() {
+    public start(): boolean {
+        if (this.gameLoopPromise) {
+            return false;
+        }
 
-        console.log('GameEngine started');
+        for(const queue of Object.values(this.actionQueue)){
+            queue.clear();
+        }
+
+        this.continueRun = true;
+        this.gameLoopPromise = this.gameLoop();
+
+        console.info('GameEngine started');
+        return true;
     }
 
     public async stop() {
+        this.continueRun = false;
+        if (this.gameLoopPromise) {
+            await this.signal.abort();
+            await this.gameLoopPromise;
+            this.gameLoopPromise = null;
+        }
+
         console.log('GameEngine stopped');
     }
 
+
+    private async pushAction(queneName: string, queue: Denque<ActionQueueItem>, action: ActionQueueItem): Promise<ActionQueueItemResult> {
+        if (this.actionSeq >= Number.MAX_SAFE_INTEGER) {
+            this.actionSeq = 0;
+        }
+        const seq = this.actionSeq++;
+
+        if (this.queueWaiters.has(seq)) {
+            throw new Error(`GameEngine: seq(${seq}) is already used`);
+        }
+
+        let done = false;
+
+        const waiter = new Promise((resolve, reject) => {
+            this.queueWaiters.set(seq, [resolve, reject]);
+            done = true;
+            queue.push(action);
+        });
+
+        await delay(0);
+        this.signal.notify();
+
+        if (!done) {
+            throw new Error(`GameEngine: push${queneName}Action failed`);
+        }
+
+        return waiter as Promise<ActionQueueItemResult>;
+    }
+
+    public async pushServerAction(action: ActionQueueItem): Promise<ActionQueueItemResult> {
+        return this.pushAction('Server', this.actionQueue.server, action);
+    }
+
+    public async pushNPCAction(action: ActionQueueItem): Promise<ActionQueueItemResult> {
+        return this.pushAction('NPC', this.actionQueue.npc, action);
+    }
+
+    public async pushAPIAction(action: ActionQueueItem): Promise<ActionQueueItemResult> {
+        return this.pushAction('API', this.actionQueue.api, action);
+    }
+
 }
\ No newline at end of file