Product purchase

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "fairhopper-sdk"]
+	path = fairhopper-sdk
+	url = git@gitea.ekirin.com:Intis/fairhopper-sdk.git

README.md

@@ -21,6 +21,35 @@
 - Move timeout: 10s. Game is finished if timeout ocurrs.
 
 
+## Game States
+
+```plantuml
+hide empty description
+
+state "Start Game" as StartGame
+state "Move" as MovePlayer: Destination reached?
+state "Destination Reached" as DestinationReached
+state "Product Selection" as ProductSelection: Enable product selection for winning player
+state "Product Selected" as ProductSelected
+state "Selection Timeout" as SelectionTimeout
+state "End Player's Game" as EndPlayer
+state "Lock Game" as LockGame <<end>>
+state "End Game" as EndGame <<end>>
+state "Unlock game" as UnlockGame <<end>>
+
+[*] -> StartGame
+StartGame -> MovePlayer
+MovePlayer <-- MovePlayer: NO
+MovePlayer --> DestinationReached: YES
+DestinationReached --> ProductSelection
+DestinationReached -> LockGame: Lock game for all other players
+ProductSelection --> ProductSelected
+ProductSelection --> SelectionTimeout
+ProductSelected --> EndGame: End game\nfor all players
+SelectionTimeout -> EndPlayer
+EndPlayer --> UnlockGame: Unlock game\n for all players
+```
+
 ## FairHopper Game Server
 
 Requirements:
@@ -71,45 +100,54 @@ WebSockets server runs on port **8011**. To run WS Server on different port, edi
 ### Architecture
 
 ```plantuml
+scale 1024 width
 actor "Player 1" as P1
 actor "Player 2" as P2
 actor "Player 3" as P3
 
-package Masterpiece {
-    usecase Game as "FairHopper\nGame Server"
+package Masterpiece #seashell {
+    rectangle "FairHopper Game Server" #lightcyan {
+        usecase API as "API Server"
+        usecase Game as "Game Engine"
         usecase WS as "WS Server"
+    }
     usecase Vis as "Visualisation\nService"
 }
 
-P1 -left-> Game: REST API
-P2 -left-> Game: REST API
-P3 -left-> Game: REST API
-Game --> WS: WebSockets
-WS --> Vis: WebSockets
+usecase ExtVis1 as "Visualisation\nService"
+usecase ExtVis2 as "Visualisation\nService"
+
+P1 -left-> API: REST API
+P2 -left-> API: REST API
+P3 -left-> API: REST API
+API --> Game
+Game --> WS: Game State
+WS --> Vis: WS Game State
+WS --> ExtVis1: WS Game State
+WS --> ExtVis2: WS Game State
 ```
 
 ### WebSockets
 
 ```plantuml
-    participant Game as "FairHopper\nGame Server"
+scale 1024 width
+box "FairHopper Game Server" #lightcyan
+    participant Game as "Game Engine"
     participant WS as "WS Server"
+endbox
 participant Client1 as "Visualisation\nClient 1"
 participant Client2 as "Visualisation\nClient 2"
 
-    Game ->o WS: Server Connect
-    activate WS #coral
-        WS -> Game: Get game state
-        activate Game #yellow
-            Game -> WS: Game state
-        deactivate
-    deactivate
+== Player movement mode ==
 
-    Client1 ->o WS: Client Connect
+Game ->o WS: Send initial state
+
+Client1 ->o WS: Client connect
 activate WS #coral
 	WS -> Client1: Game state
 deactivate
 
-    Client2 ->o WS: Client Connect
+Client2 ->o WS: Client connect
 activate WS #coral
 	WS -> Client2: Game state
 deactivate
@@ -121,6 +159,27 @@ WS --> Vis: WebSockets
         WS o-> Client2: Game state
     deactivate
 end
+
+== Product purchase mode ==
+
+Game -> WS: Purchase start
+activate WS #coral
+	WS o-> Client1: Purchase start
+	WS o-> Client2: Purchase start
+deactivate
+
+loop #lightyellow Purchase countdown timer
+	Game ->o WS: Timer count down
+    activate WS #coral
+        WS o-> Client1: Purchase time left
+        WS o-> Client2: Purchase time left
+    deactivate
+end
+Game -> WS: Purchase done
+activate WS #coral
+	WS o-> Client1: Purchase done
+	WS o-> Client2: Purchase done
+deactivate
 ```
 
 
@@ -131,7 +190,7 @@ end
 - Move right
 - Move up
 - Move down
-- Get current position
+- Get player info
 - Get board info
 
 Check REST API interface on [FastAPI docs](http://localhost:8010/docs).

api_tests/requests.http

@@ -0,0 +1,48 @@
+GET http://localhost:8010/ping
+###
+
+# create new game
+POST http://localhost:8010/game
+Content-Type: application/json
+
+{
+  "player_name": "Mirko"
+}
+###
+
+# get game info
+GET http://localhost:8010/game
+###
+
+# get player info
+GET http://localhost:8010/player/test-player-pero
+###
+
+# move player left
+POST http://localhost:8010/player/test-player-pero/move/left
+###
+
+# move player right
+POST http://localhost:8010/player/test-player-pero/move/right
+###
+
+# move player up
+POST http://localhost:8010/player/test-player-pero/move/up
+###
+
+# move player down
+POST http://localhost:8010/player/test-player-pero/move/down
+###
+
+# purchase product
+POST http://localhost:8010/player/test-player-pero/product/purchase
+Content-Type: application/json
+
+{
+  "product_uuid": "cocacola-id"
+}
+###
+
+# move Mirko left
+POST http://localhost:8010/player/test-player-mirko/move/left
+###

frontend/index.html

@@ -8,12 +8,25 @@
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css"
         integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">
     <link rel="stylesheet" href="styles.css">
-    <title>Document</title>
+    <script src="js/frontend.js"></script>
+
+    <title>FairHopper Visualisation Client</title>
 </head>
 
 <body>
-    <div class="container-fluid">
-        <h1>FairHopper WS Client</h1>
+    <main class="container-fluid container">
+        <h1 class="mt-1 mb-2">
+            FairHopper Visualisation Client
+        </h1>
+        <div id="purchase-container" class="purchase-container d-none">
+            <div class="d-flex header">
+                <h3>
+                    Product selection
+                </h3>
+                <h3 id="purchase-countdown" class="countdown"></h3>
+            </div>
+            <div id="products-content" class="products-content"></div>
+        </div>
         <div class="row">
             <div class="col-10">
                 <div class="board-container">
@@ -21,119 +34,13 @@
                 </div>
             </div>
             <div class="col-2">
-                <h3>Players</h3>
+                <h3 class="pb-2 border-bottom">
+                    Players
+                </h3>
                 <ul class="players" id="players-content"></ul>
             </div>
         </div>
-    </div>
+    </main>
 </body>
 
-<script>
-    function createBoard(board) {
-        let html = "";
-        for (let y = 0; y < board.height; y++) {
-            let colHtml = "";
-            for (let x = 0; x < board.width; x++) {
-                colHtml += `<div class="cell" id="cell-${x}-${y}">&nbsp;</div>`;
-            }
-            html += `
-                <div class="flex-grid">
-                    ${colHtml}
-                </div>
-            `;
-        }
-        document.getElementById("board-content").innerHTML = html;
-    }
-
-    function findCell(position) {
-        return document.getElementById(`cell-${position.x}-${position.y}`);
-    }
-
-    function renderCellContent(position, content) {
-        const cell = findCell(position);
-        if (cell) {
-            cell.innerText = content;
-        }
-    }
-
-    function renderPlayerList(players) {
-        const html = players.map((player) => {
-            return `
-                <li class="${player.reached_destination ? "text-success" : ""}">
-                    ${player.name} (${player.move_count})
-                    ${player.reached_destination ? "✅" : ""}
-                </li>
-            `;
-        }).join("");
-        document.getElementById("players-content").innerHTML = html;
-    }
-
-    function renderPlayers(players) {
-        players.forEach(player => {
-            const cell = findCell(player.position);
-            if (cell) {
-                const playerIcon = "😎";
-                const html = `
-                    <div class="player-tooltip">${player.name}</div>
-                    ${playerIcon}
-                `;
-                cell.innerHTML = html;
-            }
-
-
-            //renderCellContent(player.position.x, player.position.y, "😎");
-
-
-        });
-    }
-
-    function getLayerObjectsOfType(layers, type) {
-        let objects = [];
-        layers.forEach(layer => {
-            objects = objects.concat(layer.objects.filter(obj => obj.type === type))
-        });
-        return objects;
-    }
-
-    function renderObstacles(layers) {
-        const objects = getLayerObjectsOfType(layers, "OBSTACLE");
-        objects.forEach(obj => {
-            renderCellContent(obj.position, "🔥");
-        });
-    }
-
-    function renderDestination(position) {
-        renderCellContent(position, "🏠");
-    }
-
-    window.onload = function () {
-        const ws = new WebSocket('ws://localhost:8011/bla-tra');
-
-        ws.onmessage = function (event) {
-            const data = JSON.parse(event.data);
-            console.log("message received:", data)
-
-            createBoard(data.board);
-            renderObstacles(data.layers)
-            renderDestination(data.destination.position);
-            renderPlayerList(data.players);
-            renderPlayers(data.players);
-        }
-
-        ws.onopen = function () {
-            console.log("open");
-        }
-
-        ws.onclose = function () {
-            console.log("close");
-        }
-
-        ws.onerror = function () {
-            console.log("error");
-        }
-    }
-
-</script>
-
-
 </html>

frontend/js/frontend.js

@@ -0,0 +1,179 @@
+const BOARD_ICONS = {
+    PLAYER: "😀",
+    PLAYER_ON_DESTINATION: "😎",
+    OBSTACLE: "🔥",
+    DESTINATION: "🏠",
+};
+
+function createBoard(board) {
+    let html = "";
+    for (let y = 0; y < board.height; y++) {
+        let colHtml = "";
+        for (let x = 0; x < board.width; x++) {
+            colHtml += `<div class="cell" id="cell-${x}-${y}">&nbsp;</div>`;
+        }
+        html += `
+                <div class="flex-grid">
+                    ${colHtml}
+                </div>
+            `;
+    }
+    document.getElementById("board-content").innerHTML = html;
+}
+
+function findCell(position) {
+    return document.getElementById(`cell-${position.x}-${position.y}`);
+}
+
+function renderCellContent(position, content) {
+    const cell = findCell(position);
+    if (cell) {
+        cell.innerText = content;
+    }
+}
+
+function renderPlayerList(players) {
+    const html = players
+        .filter((player) => player.active)
+        .map((player) => {
+            const onDestination = player.state == "ON_DESTINATION";
+            return `
+                <li class="${onDestination ? "text-success" : ""}">
+                    ${player.name} (${player.move_count})
+                    ${onDestination ? "✅" : ""}
+                </li>
+            `;
+        })
+        .join("");
+    document.getElementById("players-content").innerHTML = html;
+}
+
+function renderPlayers(players) {
+    players
+        .filter((player) => player.active)
+        .forEach((player) => {
+            const cell = findCell(player.position);
+            const onDestination = player.state == "ON_DESTINATION";
+            const playerIcon = onDestination ? BOARD_ICONS.PLAYER_ON_DESTINATION : BOARD_ICONS.PLAYER;
+            if (cell) {
+                const html = `
+                    <div class="player-tooltip">${player.name}</div>
+                    ${playerIcon}
+                `;
+                cell.innerHTML = html;
+            }
+        });
+}
+
+function getLayerObjectsOfType(layers, type) {
+    let objects = [];
+    layers.forEach((layer) => {
+        objects = objects.concat(layer.objects.filter((obj) => obj.type === type));
+    });
+    return objects;
+}
+
+function renderObstacles(layers) {
+    const objects = getLayerObjectsOfType(layers, "OBSTACLE");
+    objects.forEach((obj) => {
+        renderCellContent(obj.position, BOARD_ICONS.OBSTACLE);
+    });
+}
+
+function renderDestination(position) {
+    renderCellContent(position, BOARD_ICONS.DESTINATION);
+}
+
+function renderGameDump(data) {
+    createBoard(data.board);
+    renderObstacles(data.layers);
+    renderDestination(data.destination.position);
+    renderPlayerList(data.players);
+    renderPlayers(data.players);
+}
+
+function productPurchaseStart(products, purchaseTimeout) {
+    console.log("productPurchaseStart:", products);
+    const containerElement = document.getElementById("purchase-container");
+    const contentElement = document.getElementById("products-content");
+    const purchaseTimeoutElement = document.getElementById("purchase-countdown");
+
+    const html = products
+        .map((product) => {
+            return `
+                <div class="card product">
+                    <img src="img/products/${product.name}.jpeg" class="card-img-topx" alt="${product.name}">
+                    <div class="card-body">
+                        <h5 class="card-title">${product.name}</h5>
+                    </div>
+                </div>
+            `;
+        })
+        .join("");
+
+    contentElement.innerHTML = html;
+    containerElement.classList.remove("d-none");
+    purchaseTimeoutElement.innerText = purchaseTimeout;
+}
+
+function productPurchaseTimerTick(timeLeft) {
+    const purchaseTimeoutElement = document.getElementById("purchase-countdown");
+    purchaseTimeoutElement.innerText = timeLeft;
+}
+
+function productPurchased(product) {
+    console.log("productPurchased:", product);
+}
+
+function productPurchaseDone() {
+    console.log("productPurchaseDone");
+    const container = document.getElementById("purchase-container");
+    container.classList.add("d-none");
+}
+
+function wsConnect() {
+    let ws = new WebSocket("ws://localhost:8011");
+    ws.onopen = () => {
+        console.log("WS connected");
+    };
+
+    ws.onmessage = (e) => {
+        const wsMessage = JSON.parse(e.data);
+        console.log("WS message received:", wsMessage);
+
+        switch (wsMessage.message) {
+            case "game_dump":
+                renderGameDump(wsMessage.data);
+                break;
+            case "product_purchase_start":
+                productPurchaseStart(wsMessage.data.products, wsMessage.data.timeout);
+                break;
+            case "product_purchase_timer_tick":
+                productPurchaseTimerTick(wsMessage.data.time_left);
+                break;
+            case "product_purchased":
+                productPurchased(wsMessage.data);
+                break;
+            case "product_purchase_done":
+                productPurchaseDone();
+                break;
+            default:
+                console.error("Unknown message:", wsMessage);
+        }
+    };
+
+    ws.onclose = (e) => {
+        setTimeout(function () {
+            wsConnect();
+        }, 1000);
+    };
+
+    ws.onerror = (err) => {
+        console.error("Socket encountered error:", err.message, "Closing socket");
+        ws.close();
+    };
+}
+
+window.onload = () => {
+    wsConnect();
+};

frontend/styles.css

@@ -2,6 +2,10 @@ body {
     background-color: whitesmoke;
 }
 
+main.container {
+    position: relative;
+}
+
 .board-container {
     background-color: white;
     border: 1px solid black;
@@ -13,11 +17,18 @@ body {
     grid-gap: 2px;
     padding-bottom: 2px;
 }
+.flex-grid:last-of-type {
+    padding-bottom: 0px;
+}
+
 .cell {
     flex: 1;
-    text-align: center;
+    aspect-ratio: 1;
     background-color: beige;
     position: relative;
+    display: flex;
+    align-items: center;
+    justify-content: center;
 }
 
 ul.players {
@@ -27,13 +38,12 @@ ul.players {
 
 .player-tooltip {
     position: absolute;
-    top: -25px;
+    margin-bottom: 50px;
     font-size: 8pt;
     padding: 2px 10px;
     color: white;
     background-color: darkred;
     border-radius: 5px;
-    z-index: 1000;
 }
 
 .player-tooltip::after {
@@ -46,3 +56,39 @@ ul.players {
     border-style: solid;
     border-color: darkred transparent transparent transparent;
 }
+
+.purchase-container {
+    width: 50vw;
+    position: fixed;
+    top: 200px;
+    left: 50%;
+    padding: 20px;
+    transform: translateX(-50%);
+    background-color: darkred;
+    z-index: 999;
+    border-radius: 10px;
+}
+
+.purchase-container .header {
+    color: white;
+    margin-bottom: 20px;
+}
+
+.purchase-container .header .countdown {
+    margin-left: auto;
+}
+
+.purchase-container .products-content {
+    display: grid;
+    grid-gap: 10px;
+    grid-template-columns: 1fr 1fr 1fr;
+}
+
+.purchase-container .products-content .product .card-title {
+    text-align: center;
+}
+
+.purchase-container .products-content .product img {
+    margin: 20px;
+    max-height: 300px;
+}

hopper/api/dependencies.py

@@ -2,6 +2,7 @@ from typing import Optional
 
 from hopper.engine import GameEngine, GameEngineFactory
 from hopper.ws_server import WSServer
+from settings import settings
 
 game_engine: Optional[GameEngine] = None
 
@@ -12,7 +13,10 @@ def create_game_engine() -> GameEngine:
     if game_engine:
         raise RuntimeError("Can't call create_game_engine() more than once!")
 
-    ws_server = WSServer(daemon=True)
+    ws_server = WSServer(
+        host=settings.ws_server.HOST,
+        port=settings.ws_server.PORT,
+    )
     ws_server.start()
 
     game_engine = GameEngineFactory.create_default(ws_server=ws_server)

hopper/api/dto.py

@@ -1,7 +1,11 @@
 from __future__ import annotations
 
+from typing import Optional
+
 from pydantic import BaseModel as PydanticBaseModel
 
+from hopper.enums import PlayerState
+
 
 class BaseModel(PydanticBaseModel):
     class Config:
@@ -29,12 +33,18 @@ class PlayerDto(BaseModel):
     position: PositionDto
     move_count: int
     move_attempt_count: int
+    state: PlayerState
 
 
 class DestinationDto(BaseModel):
     position: PositionDto
 
 
+class ProductDto(BaseModel):
+    name: str
+    uuid: str
+    description: Optional[str] = None
+
 class StartGameRequestDto(BaseModel):
     player_name: str
 
@@ -58,3 +68,11 @@ class PlayerInfoResponseDto(MovePlayerResponseDto):
 
 class ErrorResponseDto(BaseModel):
     detail: str
+
+
+class GetProductsResponse(BaseModel):
+    products: list[ProductDto]
+
+
+class PurchaseProductDto(BaseModel):
+    product_uuid: str

hopper/api/views.py

@@ -6,16 +6,20 @@ from hopper.api.dto import (
     DestinationDto,
     ErrorResponseDto,
     GameInfoDto,
+    GetProductsResponse,
     MovePlayerResponseDto,
     PingResponse,
     PlayerInfoResponseDto,
+    ProductDto,
+    PurchaseProductDto,
     StartGameRequestDto,
     StartGameResponseDto,
 )
 from hopper.engine import GameEngine
 from hopper.enums import Direction, PlayerMoveResult
-from hopper.errors import Collision, PositionOutOfBounds
+from hopper.errors import Collision, GameLockForMovement, PositionOutOfBounds, PurchaseForbiddenForPlayer
 from hopper.models.player import Player
+from settings import settings
 
 router = APIRouter()
 
@@ -28,7 +32,7 @@ def get_player(uuid: str, engine: GameEngine = Depends(get_game_engine)) -> Play
         )
     if not player.active:
         raise HTTPException(
-            status_code=status.HTTP_404_NOT_FOUND,
+            status_code=status.HTTP_403_FORBIDDEN,
             detail="Player kicked out due to inactivity",
         )
     return player
@@ -53,12 +57,14 @@ async def get_game_info(
     )
 
 
-@router.post("/game", response_model=StartGameResponseDto)
+@router.post(
+    "/game", response_model=StartGameResponseDto, status_code=status.HTTP_201_CREATED
+)
 async def start_game(
     body: StartGameRequestDto,
     engine: GameEngine = Depends(get_game_engine),
 ) -> StartGameResponseDto:
-    new_player = await engine.start_game(player_name=body.player_name)
+    new_player = await engine.start_game_for_player(player_name=body.player_name)
 
     return StartGameResponseDto(
         board=engine.board,
@@ -72,7 +78,16 @@ async def start_game(
 @router.get(
     "/player/{uuid}",
     response_model=PlayerInfoResponseDto,
-    status_code=status.HTTP_201_CREATED,
+    responses={
+        status.HTTP_403_FORBIDDEN: {
+            "model": ErrorResponseDto,
+            "description": " Player inactive",
+        },
+        status.HTTP_404_NOT_FOUND: {
+            "model": ErrorResponseDto,
+            "description": " Player with uuid not found, probably kicked out",
+        },
+    },
 )
 async def get_player_info(
     player: Player = Depends(get_player),
@@ -91,12 +106,20 @@ async def get_player_info(
         },
         status.HTTP_403_FORBIDDEN: {
             "model": ErrorResponseDto,
-            "description": " Player uuid not valid, probably due to inactivity",
+            "description": " Player inactive",
+        },
+        status.HTTP_404_NOT_FOUND: {
+            "model": ErrorResponseDto,
+            "description": " Player with uuid not found, probably kicked out",
         },
         status.HTTP_409_CONFLICT: {
             "model": ErrorResponseDto,
             "description": " Position out of bounds or collision with an object",
         },
+        status.HTTP_423_LOCKED: {
+            "model": ErrorResponseDto,
+            "description": " Player reached destination. Can't move anymore.",
+        },
     },
 )
 async def move_player(
@@ -115,8 +138,52 @@ async def move_player(
         raise HTTPException(
             status_code=status.HTTP_409_CONFLICT, detail="Collision with an object"
         )
+    except GameLockForMovement:
+        raise HTTPException(
+            status_code=status.HTTP_423_LOCKED,
+            detail="Player reached destination. Can't move anymore.",
+        )
 
     if move_result == PlayerMoveResult.DESTINATION_REACHED:
         response.status_code = status.HTTP_200_OK
 
     return MovePlayerResponseDto(player=player)
+
+
+@router.get("/products", response_model=GetProductsResponse)
+async def get_products() -> GetProductsResponse:
+    return GetProductsResponse(
+        products=settings.products,
+    )
+
+
+@router.get("/products/{uuid}", response_model=ProductDto)
+async def get_product(uuid: str) -> ProductDto:
+    for product in settings.products:
+        if product.uuid == uuid:
+            return ProductDto.from_orm(product)
+    raise HTTPException(
+        status_code=status.HTTP_404_NOT_FOUND, detail="Product not found"
+    )
+
+
+@router.post("/player/{uuid}/product/purchase")
+async def purchase_product(
+    body: PurchaseProductDto,
+    engine: GameEngine = Depends(get_game_engine),
+    player: Player = Depends(get_player),
+):
+    for product in settings.products:
+        if product.uuid == body.product_uuid:
+            try:
+                await engine.purchase_product(player=player, product=product)
+            except PurchaseForbiddenForPlayer:
+                raise HTTPException(
+                    status_code=status.HTTP_403_FORBIDDEN,
+                    detail="Purchase forbidden for this player",
+                )
+            break
+    else:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Product not found"
+        )

hopper/api_tests/requests.http

@@ -1,35 +0,0 @@
-GET http://localhost:8010/ping
-###
-
-# create new game
-POST http://localhost:8010/game
-Content-Type: application/json
-
-{
-  "player_name": "Mirko"
-}
-###
-
-# get game info
-GET http://localhost:8010/game
-###
-
-# get player info
-GET http://localhost:8010/player/test-player-id
-###
-
-# move player left
-POST http://localhost:8010/player/test-player-id/move/left
-###
-
-# move player right
-POST http://localhost:8010/player/test-player-id/move/right
-###
-
-# move player up
-POST http://localhost:8010/player/test-player-id/move/up
-###
-
-# move player down
-POST http://localhost:8010/player/test-player-id/move/down
-###

hopper/countdown_timer.py

@@ -0,0 +1,31 @@
+import time
+from threading import Event, Thread
+from typing import Callable, Optional
+
+
+class CountdownTimer(Thread):
+    def __init__(
+        self,
+        seconds: int,
+        timer_tick_callback: Optional[Callable[[int], None]] = None,
+        timer_done_callback: Optional[Callable[[], None]] = None,
+    ) -> None:
+        self.seconds = seconds
+        self.stop_event = Event()
+        self.timer_tick_callback = timer_tick_callback
+        self.timer_done_callback = timer_done_callback
+        super().__init__(daemon=True)
+
+    def run(self) -> None:
+        time_left = self.seconds
+        while time_left and not self.stop_event.is_set():
+            time.sleep(1)
+            time_left -= 1
+            if self.timer_tick_callback and not self.stop_event.is_set():
+                self.timer_tick_callback(time_left)
+
+        if time_left == 0 and self.timer_done_callback:
+            self.timer_done_callback()
+
+    def stop(self) -> None:
+        self.stop_event.set()

hopper/engine.py

@@ -1,9 +1,16 @@
 import asyncio
 import logging
+import random
 from typing import Optional
 
-from hopper.enums import Direction, PlayerMoveResult
-from hopper.errors import Collision, PositionOutOfBounds
+from hopper.countdown_timer import CountdownTimer
+from hopper.enums import Direction, GameState, PlayerMoveResult, PlayerState
+from hopper.errors import (
+    Collision,
+    GameLockForMovement,
+    PositionOutOfBounds,
+    PurchaseForbiddenForPlayer,
+)
 from hopper.models.board import (
     BOARD_DUMP_CHARS,
     BoardLayout,
@@ -15,23 +22,48 @@ from hopper.models.board import (
     create_random_position,
 )
 from hopper.models.player import Player, PlayerList, Position
+from hopper.models.product import Product
 from hopper.watchdog import InactivityWatchdog
 from hopper.ws_server import WSServer
 from settings import settings
 
 
+def create_player_start_position(board_width: int, board_height: int) -> Position:
+    """Create random position somewhere on the board border"""
+    border_len = (board_width + board_height) * 2
+    rnd_position = random.randint(0, border_len - 1)
+
+    if rnd_position < board_width * 2:
+        x = rnd_position % board_width
+        y = 0 if rnd_position < board_width else board_height - 1
+    else:
+        rnd_position -= 2 * board_width
+        x = 0 if rnd_position < board_height else board_width - 1
+        y = rnd_position % board_height
+
+    return Position(x=x, y=y)
+
+
 class GameEngine:
-    def __init__(self, board: GameBoard, ws_server: Optional[WSServer] = None) -> None:
+    def __init__(self, board: GameBoard, ws_server: WSServer = None) -> None:
         self.board = board
         self.ws_server = ws_server
         self.players = PlayerList()
         self._inacivity_watchdog = None
+        self._purchase_countdown_timer: Optional[CountdownTimer] = None
+        self.game_state = GameState.RUNNING
         self.__debug_print_board()
 
     def dump_board(self) -> list[list[str]]:
         dump = self.board.dump()
 
         for player in self.players:
+            show_player = (
+                player.active
+                and player.position.y < len(dump)
+                and player.position.x < len(dump[player.position.y])
+            )
+            if show_player:
                 dump[player.position.y][player.position.x] = BOARD_DUMP_CHARS[
                     ObjectType.PLAYER
                 ]
@@ -49,24 +81,33 @@ class GameEngine:
             self._inacivity_watchdog = InactivityWatchdog(
                 players=self.players,
                 ws_server=self.ws_server,
-                daemon=True,
             )
             self._inacivity_watchdog.start()
 
-    async def start_game(self, player_name: str) -> Player:
+    async def send_game_dump(self):
+        self.__debug_print_board()
+        await self.ws_server.send_game_dump()
+
+    async def reset_game(self) -> None:
+        self.__debug_print_board()
+        self.game_state = GameState.RUNNING
+        self.players.clear()
+        await self.send_game_dump()
+
+    async def start_game_for_player(self, player_name: str) -> Player:
         self._start_inactivity_watchdog()
         player = Player(
             name=player_name,
-            position=Position(0, 0),
+            position=create_player_start_position(self.board.width, self.board.height),
+            state=PlayerState.CREATED,
         )
         self.players.append(player)
 
         logging.info(f"Starting new game for player: {player}")
         self.__debug_print_board()
 
-        if self.ws_server:
-            await self.ws_server.send_game_state()
-
+        await self.send_game_dump()
+        await asyncio.sleep(settings.game.MOVE_DELAY)
         return player
 
     def _move_position(self, position: Position, direction: Direction) -> Position:
@@ -88,14 +129,18 @@ class GameEngine:
     ) -> PlayerMoveResult:
         player.reset_timeout()
 
+        if self.game_state == GameState.LOCK_FOR_MOVEMENT:
+            raise GameLockForMovement("Player reached destination. Can't move anymore.")
+
         # player will not be able to move once they reach the destination
-        if player.reached_destination:
+        if player.state == PlayerState.ON_DESTINATION:
             return PlayerMoveResult.DESTINATION_REACHED
 
         logging.info(f"Player {player} move to {direction}")
         new_position = self._move_position(player.position, direction)
 
         player.move_attempt_count += 1
+        player.state = PlayerState.MOVING
 
         if not self._position_in_board_bounds(new_position):
             raise PositionOutOfBounds()
@@ -107,19 +152,13 @@ class GameEngine:
         player.move_count += 1
 
         if self._is_player_on_destination(player):
-            player.reached_destination = True
-            logging.info(f"Player {player} reached destination!")
-
-        if self.ws_server:
-            await self.ws_server.send_game_state()
-
-        self.__debug_print_board()
-
-        if player.reached_destination:
+            player.state = PlayerState.ON_DESTINATION
+            await self._player_on_destination(player)
             return PlayerMoveResult.DESTINATION_REACHED
 
-        await asyncio.sleep(settings.game.MOVE_DELAY)
+        await self.send_game_dump()
 
+        await asyncio.sleep(settings.game.MOVE_DELAY)
         return PlayerMoveResult.OK
 
     def _is_player_on_destination(self, player: Player) -> bool:
@@ -133,6 +172,64 @@ class GameEngine:
     def _colided_with_obstacle(self, position: Position) -> bool:
         return self.board.get_object_at_position(position) is not None
 
+    async def _player_on_destination(self, player: Player) -> None:
+        logging.info(f"Player {player} reached destination!")
+
+        self.game_state = GameState.LOCK_FOR_MOVEMENT
+        await self.send_game_dump()
+
+        await self.ws_server.send_product_purchase_start_message(
+            player=player, products=settings.products
+        )
+
+        logging.info(
+            f"Starting purchase countdown timer for {settings.purchase_timeout} seconds"
+        )
+
+        def on_purchase_timer_tick(time_left) -> None:
+            logging.info(f"Purchase countdown timer tick, time left: {time_left}")
+            asyncio.run(
+                self.ws_server.send_product_purchase_time_left_message(
+                    player=player, time_left=time_left
+                )
+            )
+
+        def on_purchase_timer_done() -> None:
+            logging.info("Ding ding! Purchase countdown timer timeout")
+            self._purchase_countdown_timer = None
+            asyncio.run(
+                self.ws_server.send_product_purchase_done_message(
+                    player=player, product=None
+                )
+            )
+            self.game_state = GameState.RUNNING
+            asyncio.run(self.send_game_dump())
+
+        self._purchase_countdown_timer = CountdownTimer(
+            seconds=settings.purchase_timeout,
+            timer_tick_callback=on_purchase_timer_tick,
+            timer_done_callback=on_purchase_timer_done,
+        )
+        self._purchase_countdown_timer.start()
+
+    async def purchase_product(self, player: Player, product: Product) -> None:
+        if not player.state == PlayerState.ON_DESTINATION:
+            raise PurchaseForbiddenForPlayer()
+        if self._purchase_countdown_timer:
+            self._purchase_countdown_timer.stop()
+        await self.ws_server.send_product_purchase_done_message(
+            player=player, product=product
+        )
+        await self.reset_game()
+
+    def _reset_player(self, player) -> None:
+        # move player to start position
+        player.position = create_player_start_position(
+            self.board.width, self.board.height
+        )
+        player.state = PlayerState.CREATED
+        player.last_seen = None
+
     def get_board_layout(self) -> BoardLayout:
         return BoardLayout(board=self.board, players=self.players)
 
@@ -143,12 +240,12 @@ class GameEngineFactory:
         board_width: int,
         board_height: int,
         obstacle_count: int = 0,
-        ws_server: Optional[WSServer] = None,
+        ws_server: WSServer = None,
     ) -> GameEngine:
         board = GameBoard(
             width=board_width,
             height=board_height,
-            destination=Destination(Position(board_height // 2, board_height // 2)),
+            destination=Destination(Position(board_width // 2, board_height // 2)),
         )
         obstacle_layer = Layer(name="obstacles")
         for _ in range(obstacle_count):
@@ -164,11 +261,13 @@ class GameEngineFactory:
             board=board,
             ws_server=ws_server,
         )
-        GameEngineFactory.__add_test_player(game.players)
+        GameEngineFactory.__add_test_players(game.players)
         return game
 
     @staticmethod
-    def create_default(ws_server: Optional[WSServer] = None) -> GameEngine:
+    def create_default(
+        ws_server: WSServer = None,
+    ) -> GameEngine:
         return GameEngineFactory.create(
             board_width=settings.board.WIDTH,
             board_height=settings.board.HEIGHT,
@@ -177,15 +276,10 @@ class GameEngineFactory:
         )
 
     @staticmethod
-    def __add_test_player(players: PlayerList) -> None:
-        if not (settings.debug and settings.debug.CREATE_TEST_PLAYER):
+    def __add_test_players(players: PlayerList) -> None:
+        if not settings.debug:
             return
 
-        player = Player(
-            name="Pero",
-            uuid="test-player-id",
-            position=Position(2, 2),
-            can_be_deactivated=False,
-        )
+        for player in settings.debug.PLAYERS:
             players.append(player)
             logging.info(f"Test player created: {player}")

hopper/enums.py

@@ -18,3 +18,16 @@ class ObjectType(str, Enum):
 class PlayerMoveResult(Enum):
     OK = auto()
     DESTINATION_REACHED = auto()
+
+
+class GameState(Enum):
+    RUNNING = auto()
+    LOCK_FOR_MOVEMENT = auto()
+    ENDGAME = auto()
+
+
+class PlayerState(str, Enum):
+    CREATED = "CREATED"
+    MOVING = "MOVING"
+    ON_DESTINATION = "ON_DESTINATION"
+    INACTIVE = "INACTIVE"

hopper/errors.py

@@ -8,3 +8,11 @@ class PositionOutOfBounds(BaseError):
 
 class Collision(BaseError):
     ...
+
+
+class GameLockForMovement(BaseError):
+    ...
+
+
+class PurchaseForbiddenForPlayer(BaseError):
+    ...

hopper/models/config.py

@@ -1,10 +1,15 @@
 import logging
 from dataclasses import dataclass
-from typing import Optional
+from typing import List, Optional
+
+from hopper.models.player import Player
+from hopper.models.product import Product
+
 
 @dataclass
 class GameSettings:
-    MOVE_DELAY: int = 0.5  # seconds
+    MOVE_DELAY: float = 0.5  # seconds
+
 
 @dataclass
 class BoardSettings:
@@ -29,7 +34,7 @@ class WSServerSettings:
 @dataclass
 class DebugSettings:
     PRINT_BOARD: bool = False
-    CREATE_TEST_PLAYER: bool = False
+    PLAYERS: Optional[List[Player]] = None
 
 
 @dataclass
@@ -38,5 +43,7 @@ class Settings:
     board: BoardSettings
     inacivity_watchdog: InactivityWatchdogSettings
     ws_server: WSServerSettings
+    purchase_timeout: int = 10 # seconds
     log_level: int = logging.INFO
+    products: Optional[List[Product]] = None
     debug: Optional[DebugSettings] = None

hopper/models/player.py

@@ -3,6 +3,8 @@ import uuid
 from dataclasses import dataclass, field
 from typing import Optional
 
+from hopper.enums import PlayerState
+
 
 @dataclass
 class Position:
@@ -20,9 +22,9 @@ class Player:
     last_seen: datetime.datetime = field(
         default_factory=lambda: datetime.datetime.now()
     )
+    state: PlayerState = PlayerState.CREATED
     active: bool = True
     can_be_deactivated: bool = True
-    reached_destination: bool = False
 
     def reset_timeout(self) -> None:
         self.last_seen = datetime.datetime.now()

hopper/models/product.py

@@ -0,0 +1,10 @@
+import uuid
+from dataclasses import dataclass, field
+from typing import Optional
+
+
+@dataclass
+class Product:
+    name: str
+    uuid: str = field(default_factory=lambda: str(uuid.uuid4()))
+    description: Optional[str] = None

hopper/models/ws_dto.py

@@ -1,8 +1,19 @@
 from __future__ import annotations
 
-from pydantic import Field
+import json
+from typing import Optional, TypeVar
 
-from hopper.api.dto import BaseModel, BoardDto, DestinationDto, PlayerDto, PositionDto
+from pydantic import Field
+from pydantic.generics import GenericModel
+
+from hopper.api.dto import (
+    BaseModel,
+    BoardDto,
+    DestinationDto,
+    PlayerDto,
+    PositionDto,
+    ProductDto,
+)
 from hopper.enums import ObjectType
 
 
@@ -15,12 +26,59 @@ class LayerDto(BaseModel):
     name: str
     objects: list[LayerObjectDto]
 
-class GameStatePlayerDto(PlayerDto):
-    reached_destination: bool
 
-
-class GameStateDto(BaseModel):
+class GameDumpDto(BaseModel):
     board: BoardDto
     destination: DestinationDto
-    players: list[GameStatePlayerDto]
+    players: list[PlayerDto]
     layers: list[LayerDto]
+
+
+class ProductPurchaseStartDto(BaseModel):
+    player: PlayerDto
+    products: list[ProductDto]
+    timeout: int
+
+
+class ProductPurchaseTimerDto(BaseModel):
+    time_left: int
+    player: PlayerDto
+
+
+class ProductPurchaseDoneDto(BaseModel):
+    player: PlayerDto
+    product: Optional[ProductDto] = None
+
+
+TMessageData = TypeVar("TMessageData", bound=BaseModel)
+
+
+class WSMessage(GenericModel):
+    message: str
+    data: Optional[TMessageData] = None
+
+    def __str__(self) -> str:
+        return self.to_str()
+
+    def to_str(self) -> str:
+        return json.dumps(self.dict())
+
+
+class WSGameDumpMessage(WSMessage):
+    message: str = "game_dump"
+    data: GameDumpDto
+
+
+class WSProductPurchaseStartMessage(WSMessage):
+    message: str = "product_purchase_start"
+    data: ProductPurchaseStartDto
+
+
+class WSProductPurchaseTimerTickMessage(WSMessage):
+    message: str = "product_purchase_timer_tick"
+    data: ProductPurchaseTimerDto
+
+
+class WSProductPurchaseDoneMessage(WSMessage):
+    message: str = "product_purchase_done"
+    data: ProductPurchaseDoneDto

hopper/watchdog.py

@@ -3,7 +3,6 @@ import datetime
 import logging
 import time
 from threading import Thread
-from typing import Optional
 
 from hopper.models.player import PlayerList
 from hopper.ws_server import WSServer
@@ -12,12 +11,12 @@ from settings import settings
 
 class InactivityWatchdog(Thread):
     def __init__(
-        self, players: PlayerList, ws_server: Optional[WSServer] = None, *args, **kwargs
+        self, players: PlayerList, ws_server: WSServer = None
     ) -> None:
         self.players = players
         self.ws_server = ws_server
         self.stopped = False
-        super().__init__(*args, **kwargs)
+        super().__init__(daemon=True)
 
     def run(self) -> None:
         logging.info("Starting inactivity watchdog")
@@ -34,7 +33,7 @@ class InactivityWatchdog(Thread):
             seconds=settings.inacivity_watchdog.KICK_TIMEOUT
         )
 
-        send_game_state = False
+        send_game_dump = False
 
         for player in self.players:
             if (
@@ -44,7 +43,7 @@ class InactivityWatchdog(Thread):
             ):
                 player.active = False
                 logging.info(f"Player {player} set as inactive")
-                send_game_state = True
+                send_game_dump = True
 
         # safe remove from list
         n = 0
@@ -53,18 +52,16 @@ class InactivityWatchdog(Thread):
             if player.can_be_deactivated and player.last_seen < kick_threshold:
                 self.players.pop(n)
                 logging.info(f"Player {player} kicked out")
-                send_game_state = True
+                send_game_dump = True
             else:
                 n += 1
 
-        if send_game_state:
-            self.send_game_state()
+        if send_game_dump:
+            self.send_game_dump()
 
-    def send_game_state(self):
-        if not self.ws_server:
-            return
-        logging.info("Sending WS game state")
-        asyncio.run(self.ws_server.send_game_state())
+    def send_game_dump(self):
+        logging.info("Sending WS game dump")
+        asyncio.run(self.ws_server.send_game_dump())
 
     def stop(self) -> None:
         self.stopped = True

hopper/ws_server.py

@@ -1,80 +1,137 @@
 import asyncio
-import json
 import logging
 from threading import Thread
+from typing import Iterable, Optional
 
 import websockets
 from websockets import WebSocketServerProtocol
 from websockets.exceptions import ConnectionClosedOK
 
-from hopper.models.ws_dto import GameStateDto
+from hopper.models.player import Player
+from hopper.models.product import Product
+from hopper.models.ws_dto import (
+    GameDumpDto,
+    ProductPurchaseDoneDto,
+    ProductPurchaseStartDto,
+    ProductPurchaseTimerDto,
+    WSGameDumpMessage,
+    WSMessage,
+    WSProductPurchaseDoneMessage,
+    WSProductPurchaseStartMessage,
+    WSProductPurchaseTimerTickMessage,
+)
 from settings import settings
 
 
 class WSServer(Thread):
-    def __init__(self, *args, **kwargs) -> None:
-        self.connected_clients = set[WebSocketServerProtocol]()
-        super().__init__(*args, **kwargs)
+    def __init__(self, host: str, port: int) -> None:
+        self.host = host
+        self.port = port
+        super().__init__(daemon=True)
 
     async def handler(self, websocket: WebSocketServerProtocol) -> None:
+        """New handler instance spawns for each connected client"""
         self.connected_clients.add(websocket)
         logging.info(f"Add client: {websocket.id}")
 
         try:
-            await self.send_game_state_to_client(websocket)
+            # send initial game dump to connected client
+            await self.send_game_dump_to_client(websocket)
+            # loop and do nothing while client is connected
             connected = True
             while connected:
                 try:
-                    message = await websocket.recv()
+                    # we're expecting nothing from client, but read if client sends a message
+                    await websocket.recv()
                 except ConnectionClosedOK:
                     connected = False
         finally:
             self.connected_clients.remove(websocket)
             logging.info(f"Remove client: {websocket.id}")
 
-    def _create_game_state_message(self) -> str:
+    async def send_message_to_client(
+        self, client: WebSocketServerProtocol, message: WSMessage
+    ) -> None:
+        message_str = message.to_str()
+        logging.debug(
+            f"Sending message {message.message} to clients: {self.connected_clients}: {message_str}"
+        )
+        await client.send(message_str)
+
+    async def send_message_to_clients(self, message: WSMessage) -> None:
+        for client in self.connected_clients:
+            await self.send_message_to_client(client, message)
+
+    def _create_game_dump_message(self) -> WSGameDumpMessage:
         # avoid circular imports
         from hopper.api.dependencies import get_game_engine
 
         engine = get_game_engine()
 
-        game_state = GameStateDto(
+        game_dump = GameDumpDto(
             board=engine.board,
             destination=engine.board.destination,
             players=engine.players,
             layers=engine.get_board_layout().layers,
         )
-        return json.dumps(game_state.dict())
+        return WSGameDumpMessage(data=game_dump)
 
-    async def send_game_state_to_client(
+    async def send_game_dump_to_client(
         self, websocket: WebSocketServerProtocol
     ) -> None:
-        message = self._create_game_state_message()
-        logging.debug(f"Sending game state to client: {websocket.id}")
-        await websocket.send(message)
+        """Send game dump to the client"""
+        message = self._create_game_dump_message()
+        logging.debug(f"Sending game dump to client: {websocket.id}")
+        await websocket.send(message.to_str())
 
-    async def send_game_state(self) -> None:
-        if not self.connected_clients:
-            return
+    async def send_game_dump(self) -> None:
+        """Broadcast game state to all connected clients"""
+        message = self._create_game_dump_message()
+        await self.send_message_to_clients(message)
 
-        message = self._create_game_state_message()
-        logging.debug(
-            f"Sending game state to clients: {self.connected_clients}: {message}"
+    async def send_product_purchase_start_message(
+        self, player: Player, products: Iterable[Product]
+    ) -> None:
+        message = WSProductPurchaseStartMessage(
+            data=ProductPurchaseStartDto(
+                player=player,
+                products=products,
+                timeout=settings.purchase_timeout,
             )
-        for client in self.connected_clients:
-            await client.send(message)
+        )
+        await self.send_message_to_clients(message)
+
+    async def send_product_purchase_time_left_message(
+        self, player: Player, time_left: int
+    ) -> None:
+        message = WSProductPurchaseTimerTickMessage(
+            data=ProductPurchaseTimerDto(
+                player=player,
+                time_left=time_left,
+            )
+        )
+        await self.send_message_to_clients(message)
+
+    async def send_product_purchase_done_message(
+        self, player: Player, product: Optional[Product] = None
+    ) -> None:
+        message = WSProductPurchaseDoneMessage(
+            data=ProductPurchaseDoneDto(player=player, product=product),
+        )
+        await self.send_message_to_clients(message)
 
     async def run_async(self) -> None:
         logging.info(
-            f"Starting FairHopper Websockets Server on {settings.ws_server.HOST}:{settings.ws_server.PORT}"
+            f"Starting FairHopper Websockets Server on {self.host}:{self.port}"
         )
 
         async with websockets.serve(
             ws_handler=self.handler,
-            host=settings.ws_server.HOST,
-            port=settings.ws_server.PORT,
+            host=self.host,
+            port=self.port,
         ):
             await asyncio.Future()  # run forever
 
     def run(self) -> None:
+        self.connected_clients = set[WebSocketServerProtocol]()
         asyncio.run(self.run_async())

settings_template.py

@@ -14,5 +14,6 @@ settings = Settings(
     inacivity_watchdog=InactivityWatchdogSettings(),
     log_level=logging.INFO,
     ws_server=WSServerSettings(),
+    purchase_timeout=10,
     debug=None,
 )