uuid -> id

README.md

@@ -92,7 +92,7 @@ To activate virtual environment:
 poetry shell
 ```
 
-WebSockets server runs on port **8011**. To run WS Server on different port, edit `settings.py` configuration. 
+WebSockets server runs on port **8011**. To run WS Server on different port, edit `settings.py` configuration.
 
 
 ## System overview
@@ -100,6 +100,7 @@ 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
@@ -129,6 +130,7 @@ WS --> ExtVis2: WS Game State
 ### WebSockets
 
 ```plantuml
+scale 1024 width
 box "FairHopper Game Server" #lightcyan
     participant Game as "Game Engine"
     participant WS as "WS Server"
@@ -136,6 +138,8 @@ endbox
 participant Client1 as "Visualisation\nClient 1"
 participant Client2 as "Visualisation\nClient 2"
 
+== Player movement mode ==
+
 Game ->o WS: Send initial state
 
 Client1 ->o WS: Client connect
@@ -155,6 +159,27 @@ loop #lightyellow On game state change
         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
 ```
 
 
@@ -195,7 +220,7 @@ Response body:
 		}
 	},
 	"player": {
-		"uuid": "75bba7cd-a4c1-4b50-b0b5-6382c2822a25",
+		"id": "75bba7cd-a4c1-4b50-b0b5-6382c2822a25",
 		"name": "Pero",
 		"position": {
 			"x": 0,
@@ -209,17 +234,17 @@ Response body:
 
 ### Player Move
 
-- POST `/player/{uuid}/move/left`
+- POST `/player/{id}/move/left`
-- POST `/player/{uuid}/move/right`
+- POST `/player/{id}/move/right`
-- POST `/player/{uuid}/move/up`
+- POST `/player/{id}/move/up`
-- POST `/player/{uuid}/move/down`
+- POST `/player/{id}/move/down`
 
 Request body: None
 
 Response code:
 - 200 OK: Destination reached
 - 201 Created: Player moved successfully
-- 403 Forbidden: Player uuid not valid, probably timeout
+- 403 Forbidden: Player id not valid, probably timeout
 - 409 Conflict: Invalid move, obstacle or position out of board
 - 422 Unprocessable Content: Validation error
 
@@ -227,7 +252,7 @@ Response body:
 ```json
 {
 	"player": {
-		"uuid": "string",
+		"id": "string",
 		"name": "Pero",
 		"position": {
 			"x": 50,
@@ -241,7 +266,7 @@ Response body:
 
 ### Get Player Info
 
-GET `/player/{{uuid}}`
+GET `/player/{{id}}`
 
 Request body: None
 
@@ -249,7 +274,7 @@ Response body:
 ```json
 {
 	"player": {
-		"uuid": "string",
+		"id": "string",
 		"name": "Pero",
 		"position": {
 			"x": 50,
@@ -309,7 +334,7 @@ Data:
 	},
 	"players": [
 		{
-			"uuid": "test-player-id",
+			"id": "test-player-id",
 			"name": "Pero",
 			"active": true,
 			"position": {
@@ -320,7 +345,7 @@ Data:
 			"move_attempt_count": 3
 		},
 		{
-			"uuid": "95962b49-0003-4bf2-b205-71f2590f2318",
+			"id": "95962b49-0003-4bf2-b205-71f2590f2318",
 			"name": "Mirko",
 			"active": true,
 			"position": {

api_tests/requests.http

@@ -34,6 +34,15 @@ POST http://localhost:8010/player/test-player-pero/move/up
 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_id": "cocacola-id"
+}
+###
+
 # move Mirko left
 POST http://localhost:8010/player/test-player-mirko/move/left
 ###

frontend/index.html

@@ -8,15 +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">
+    <script src="js/frontend.js"></script>
 
     <title>FairHopper Visualisation Client</title>
 </head>
 
 <body>
-    <div class="container-fluid">
+    <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">
@@ -30,155 +40,7 @@
                 <ul class="players" id="players-content"></ul>
             </div>
         </div>
-    </div>
+    </main>
 </body>
 
-<script>
-    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) {
-        console.log("productPurchaseStart:", products)
-    }
-
-    function productPurchased(product) {
-        console.log("productPurchased:", product)
-    }
-
-    function productPurchaseDone() {
-        console.log("productPurchaseDone")
-    }
-
-    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)
-                    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();
-    }
-</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;
@@ -40,7 +44,6 @@ ul.players {
     color: white;
     background-color: darkred;
     border-radius: 5px;
-    z-index: 1000;
 }
 
 .player-tooltip::after {
@@ -53,3 +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/dto.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import Optional
+
 from pydantic import BaseModel as PydanticBaseModel
 
 from hopper.enums import PlayerState
@@ -25,7 +27,7 @@ class PositionDto(BaseModel):
 
 
 class PlayerDto(BaseModel):
-    uuid: str
+    id: str
     name: str
     active: bool
     position: PositionDto
@@ -38,6 +40,11 @@ class DestinationDto(BaseModel):
     position: PositionDto
 
 
+class ProductDto(BaseModel):
+    name: str
+    id: str
+    description: Optional[str] = None
+
 class StartGameRequestDto(BaseModel):
     player_name: str
 
@@ -61,3 +68,11 @@ class PlayerInfoResponseDto(MovePlayerResponseDto):
 
 class ErrorResponseDto(BaseModel):
     detail: str
+
+
+class GetProductsResponse(BaseModel):
+    products: list[ProductDto]
+
+
+class PurchaseProductDto(BaseModel):
+    product_id: str

hopper/api/views.py

@@ -6,22 +6,26 @@ 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, GameLockForMovement, PositionOutOfBounds
+from hopper.errors import Collision, GameLockForMovement, PositionOutOfBounds, PurchaseForbiddenForPlayer
 from hopper.models.player import Player
+from settings import settings
 
 router = APIRouter()
 
 
-def get_player(uuid: str, engine: GameEngine = Depends(get_game_engine)) -> Player:
+def get_player(id: str, engine: GameEngine = Depends(get_game_engine)) -> Player:
-    player = engine.players.find(uuid)
+    player = engine.players.find(id)
     if player is None:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND, detail="Player not found"
@@ -72,7 +76,7 @@ async def start_game(
 
 
 @router.get(
-    "/player/{uuid}",
+    "/player/{id}",
     response_model=PlayerInfoResponseDto,
     responses={
         status.HTTP_403_FORBIDDEN: {
@@ -81,7 +85,7 @@ async def start_game(
         },
         status.HTTP_404_NOT_FOUND: {
             "model": ErrorResponseDto,
-            "description": " Player with uuid not found, probably kicked out",
+            "description": " Player with id not found, probably kicked out",
         },
     },
 )
@@ -92,7 +96,7 @@ async def get_player_info(
 
 
 @router.post(
-    "/player/{uuid}/move/{direction}",
+    "/player/{id}/move/{direction}",
     response_model=MovePlayerResponseDto,
     status_code=status.HTTP_201_CREATED,
     responses={
@@ -106,7 +110,7 @@ async def get_player_info(
         },
         status.HTTP_404_NOT_FOUND: {
             "model": ErrorResponseDto,
-            "description": " Player with uuid not found, probably kicked out",
+            "description": " Player with id not found, probably kicked out",
         },
         status.HTTP_409_CONFLICT: {
             "model": ErrorResponseDto,
@@ -144,3 +148,42 @@ async def move_player(
         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/{id}", response_model=ProductDto)
+async def get_product(id: str) -> ProductDto:
+    for product in settings.products:
+        if product.id == id:
+            return ProductDto.from_orm(product)
+    raise HTTPException(
+        status_code=status.HTTP_404_NOT_FOUND, detail="Product not found"
+    )
+
+
+@router.post("/player/{id}/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.id == body.product_id:
+            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/countdown_timer.py

@@ -5,21 +5,27 @@ from typing import Callable, Optional
 
 class CountdownTimer(Thread):
     def __init__(
-        self, seconds: int, callback: Optional[Callable[[], None]] = None
+        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.callback = callback
+        self.timer_tick_callback = timer_tick_callback
+        self.timer_done_callback = timer_done_callback
         super().__init__(daemon=True)
 
     def run(self) -> None:
-        cnt = self.seconds
+        time_left = self.seconds
-        while cnt and not self.stop_event.is_set():
+        while time_left and not self.stop_event.is_set():
-            cnt -= 1
             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 cnt == 0 and self.callback:
+        if time_left == 0 and self.timer_done_callback:
-            self.callback()
+            self.timer_done_callback()
 
     def stop(self) -> None:
         self.stop_event.set()

hopper/engine.py

@@ -5,8 +5,12 @@ from typing import Optional
 
 from hopper.countdown_timer import CountdownTimer
 from hopper.enums import Direction, GameState, PlayerMoveResult, PlayerState
-from hopper.errors import Collision, GameLockForMovement, PositionOutOfBounds
+from hopper.errors import (
-from hopper.interfaces import SendGameDumpInterface
+    Collision,
+    GameLockForMovement,
+    PositionOutOfBounds,
+    PurchaseForbiddenForPlayer,
+)
 from hopper.models.board import (
     BOARD_DUMP_CHARS,
     BoardLayout,
@@ -18,20 +22,37 @@ 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__(
+    def __init__(self, board: GameBoard, ws_server: WSServer = None) -> None:
-        self, board: GameBoard, ws_server: Optional[SendGameDumpInterface] = 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.reset_game()
+        self.game_state = GameState.RUNNING
+        self.__debug_print_board()
 
     def dump_board(self) -> list[list[str]]:
         dump = self.board.dump()
@@ -63,15 +84,21 @@ class GameEngine:
             )
             self._inacivity_watchdog.start()
 
-    def reset_game(self) -> None:
+    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=self._create_player_start_position(),
+            position=create_player_start_position(self.board.width, self.board.height),
             state=PlayerState.CREATED,
         )
         self.players.append(player)
@@ -79,27 +106,10 @@ class GameEngine:
         logging.info(f"Starting new game for player: {player}")
         self.__debug_print_board()
 
-        if self.ws_server:
+        await self.send_game_dump()
-            await self.ws_server.send_game_dump()
-
         await asyncio.sleep(settings.game.MOVE_DELAY)
         return player
 
-    def _create_player_start_position(self) -> Position:
-        """Create random position somewhere on the board border"""
-        border_len = (self.board.width + self.board.height) * 2
-        rnd_position = random.randint(0, border_len - 1)
-
-        if rnd_position < self.board.width * 2:
-            x = rnd_position % self.board.width
-            y = 0 if rnd_position < self.board.width else self.board.height - 1
-        else:
-            rnd_position -= 2 * self.board.width
-            x = 0 if rnd_position < self.board.height else self.board.width - 1
-            y = rnd_position % self.board.height
-
-        return Position(x=x, y=y)
-
     def _move_position(self, position: Position, direction: Direction) -> Position:
         new_position = Position(position.x, position.y)
         if direction == Direction.LEFT:
@@ -146,10 +156,8 @@ class GameEngine:
             await self._player_on_destination(player)
             return PlayerMoveResult.DESTINATION_REACHED
 
-        if self.ws_server:
+        await self.send_game_dump()
-            await self.ws_server.send_game_dump()
 
-        self.__debug_print_board()
         await asyncio.sleep(settings.game.MOVE_DELAY)
         return PlayerMoveResult.OK
 
@@ -168,25 +176,59 @@ class GameEngine:
         logging.info(f"Player {player} reached destination!")
 
         self.game_state = GameState.LOCK_FOR_MOVEMENT
-        await self.ws_server.send_game_dump()
+        await self.send_game_dump()
-        self.__debug_print_board()
 
-        await self.ws_server.send_product_purchase_message(products=settings.products)
+        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())
 
-        logging.info(f"Starting purchase countdown timer for {settings.purchase_timeout} seconds")
         self._purchase_countdown_timer = CountdownTimer(
             seconds=settings.purchase_timeout,
-            callback=self._on_purchase_timeout,
+            timer_tick_callback=on_purchase_timer_tick,
+            timer_done_callback=on_purchase_timer_done,
         )
         self._purchase_countdown_timer.start()
 
-    def _on_purchase_timeout(self) -> None:
+    async def purchase_product(self, player: Player, product: Product) -> None:
-        logging.info("Ding ding! Purchase countdown timer timeout")
+        if not player.state == PlayerState.ON_DESTINATION:
-        self._purchase_countdown_timer = None
+            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()
 
-        asyncio.run(self.ws_server.send_product_purchase_done_message(product=None))
+    def _reset_player(self, player) -> None:
-
+        # move player to start position
-        self.game_state = GameState.RUNNING
+        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)
@@ -198,7 +240,7 @@ class GameEngineFactory:
         board_width: int,
         board_height: int,
         obstacle_count: int = 0,
-        ws_server: Optional[SendGameDumpInterface] = None,
+        ws_server: WSServer = None,
     ) -> GameEngine:
         board = GameBoard(
             width=board_width,
@@ -224,7 +266,7 @@ class GameEngineFactory:
 
     @staticmethod
     def create_default(
-        ws_server: Optional[SendGameDumpInterface] = None,
+        ws_server: WSServer = None,
     ) -> GameEngine:
         return GameEngineFactory.create(
             board_width=settings.board.WIDTH,

hopper/errors.py

@@ -12,3 +12,7 @@ class Collision(BaseError):
 
 class GameLockForMovement(BaseError):
     ...
+
+
+class PurchaseForbiddenForPlayer(BaseError):
+    ...

hopper/interfaces.py

@@ -1,16 +0,0 @@
-from typing import Iterable, Optional, Protocol
-
-from hopper.models.product import Product
-
-
-class SendGameDumpInterface(Protocol):
-    async def send_game_dump(self) -> None:
-        ...
-
-    async def send_product_purchase_message(self, products: Iterable[Product]) -> None:
-        ...
-
-    async def send_product_purchase_done_message(
-        self, product: Optional[Product] = None
-    ) -> None:
-        ...

hopper/models/player.py

@@ -15,7 +15,7 @@ class Position:
 @dataclass
 class Player:
     name: str
-    uuid: str = field(default_factory=lambda: str(uuid.uuid4()))
+    id: str = field(default_factory=lambda: str(uuid.uuid4()))
     position: Position = field(default_factory=lambda: Position(0, 0))
     move_count: int = 0
     move_attempt_count: int = 0
@@ -31,8 +31,8 @@ class Player:
 
 
 class PlayerList(list[Player]):
-    def find(self, uuid: str) -> Optional[Player]:
+    def find(self, id: str) -> Optional[Player]:
         for player in self:
-            if player.uuid == uuid:
+            if player.id == id:
                 return player
         return None

hopper/models/product.py

@@ -1,8 +1,10 @@
-from dataclasses import dataclass, field
 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()))
+    id: str = field(default_factory=lambda: str(uuid.uuid4()))
+    description: Optional[str] = None

hopper/models/ws_dto.py

@@ -6,9 +6,15 @@ from typing import Optional, TypeVar
 from pydantic import Field
 from pydantic.generics import GenericModel
 
-from hopper.api.dto import BaseModel, BoardDto, DestinationDto, PlayerDto, PositionDto
+from hopper.api.dto import (
+    BaseModel,
+    BoardDto,
+    DestinationDto,
+    PlayerDto,
+    PositionDto,
+    ProductDto,
+)
 from hopper.enums import ObjectType
-from hopper.models.product import Product
 
 
 class LayerObjectDto(BaseModel):
@@ -21,27 +27,26 @@ class LayerDto(BaseModel):
     objects: list[LayerObjectDto]
 
 
-class ProductDto(BaseModel):
-    name: str
-    uuid: str
-
-
-class GameDumpPlayerDto(PlayerDto):
-    ...
-
-
 class GameDumpDto(BaseModel):
     board: BoardDto
     destination: DestinationDto
-    players: list[GameDumpPlayerDto]
+    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
 
 
@@ -64,11 +69,16 @@ class WSGameDumpMessage(WSMessage):
     data: GameDumpDto
 
 
-class WSProductPurchaseStart(WSMessage):
+class WSProductPurchaseStartMessage(WSMessage):
     message: str = "product_purchase_start"
     data: ProductPurchaseStartDto
 
 
-class WSProductPurchaseDone(WSMessage):
+class WSProductPurchaseTimerTickMessage(WSMessage):
+    message: str = "product_purchase_timer_tick"
+    data: ProductPurchaseTimerDto
+
+
+class WSProductPurchaseDoneMessage(WSMessage):
     message: str = "product_purchase_done"
     data: ProductPurchaseDoneDto

hopper/watchdog.py

@@ -3,16 +3,15 @@ import datetime
 import logging
 import time
 from threading import Thread
-from typing import Optional
 
-from hopper.interfaces import SendGameDumpInterface
 from hopper.models.player import PlayerList
+from hopper.ws_server import WSServer
 from settings import settings
 
 
 class InactivityWatchdog(Thread):
     def __init__(
-        self, players: PlayerList, ws_server: Optional[SendGameDumpInterface] = None
+        self, players: PlayerList, ws_server: WSServer = None
     ) -> None:
         self.players = players
         self.ws_server = ws_server
@@ -61,8 +60,6 @@ class InactivityWatchdog(Thread):
             self.send_game_dump()
 
     def send_game_dump(self):
-        if not self.ws_server:
-            return
         logging.info("Sending WS game dump")
         asyncio.run(self.ws_server.send_game_dump())
 

hopper/ws_server.py

@@ -7,16 +7,20 @@ import websockets
 from websockets import WebSocketServerProtocol
 from websockets.exceptions import ConnectionClosedOK
 
+from hopper.models.player import Player
 from hopper.models.product import Product
 from hopper.models.ws_dto import (
     GameDumpDto,
     ProductPurchaseDoneDto,
     ProductPurchaseStartDto,
+    ProductPurchaseTimerDto,
     WSGameDumpMessage,
     WSMessage,
-    WSProductPurchaseDone,
+    WSProductPurchaseDoneMessage,
-    WSProductPurchaseStart,
+    WSProductPurchaseStartMessage,
+    WSProductPurchaseTimerTickMessage,
 )
+from settings import settings
 
 
 class WSServer(Thread):
@@ -85,16 +89,35 @@ class WSServer(Thread):
         message = self._create_game_dump_message()
         await self.send_message_to_clients(message)
 
-    async def send_product_purchase_message(self, products: Iterable[Product]) -> None:
+    async def send_product_purchase_start_message(
-        message = WSProductPurchaseStart(
+        self, player: Player, products: Iterable[Product]
-            data=ProductPurchaseStartDto(products=products)
+    ) -> None:
+        message = WSProductPurchaseStartMessage(
+            data=ProductPurchaseStartDto(
+                player=player,
+                products=products,
+                timeout=settings.purchase_timeout,
+            )
+        )
+        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, product: Optional[Product] = None
+        self, player: Player, product: Optional[Product] = None
     ) -> None:
-        message = WSProductPurchaseDone(data=ProductPurchaseDoneDto(product=product))
+        message = WSProductPurchaseDoneMessage(
+            data=ProductPurchaseDoneDto(player=player, product=product),
+        )
         await self.send_message_to_clients(message)
 
     async def run_async(self) -> None:

sdk/demo.py

@@ -0,0 +1,51 @@
+import random
+from fh_sdk import Direction, FairHopper, Position
+import math
+
+HOST = "http://localhost"
+PORT = 8010
+
+
+def calc_angle(position1: Position, position2: Position) -> float:
+    x1, y1 = position1.x, position1.y
+    x2, y2 = position2.x, position2.y
+    return math.atan2(y2 - y1, x2 - x1) * (180 / math.pi)
+
+
+fh = FairHopper(host=HOST, port=PORT)
+res = fh.ping()
+
+game = fh.start_game(player_name=f"Mirko {random.randint(0, 9999)}")
+print(game.player.position)
+quit()
+
+res = fh.get_game_info()
+print(">>>>>", res)
+
+res = fh.get_player_info("XX")
+print(">>>>>", res)
+
+position = game.player.position
+dest_position = game.destination.position
+
+# p1 = PositionDto(x=0, y=20)
+# p2 = PositionDto(x=10, y=10)
+# angle = calc_angle(p1, p2)
+# print(angle)
+# quit()
+
+for _ in range(10):
+    angle = calc_angle(position, dest_position) + 180
+    if 0 <= angle < 90:
+        direction = Direction.RIGHT
+    elif 90 <= angle <= 180:
+        direction = Direction.DOWN
+    elif 180 <= angle <= 270:
+        direction = Direction.RIGHT
+    else:
+        direction = Direction.UP
+
+    print(position, dest_position, int(angle), direction)
+
+    move_response = fh.move(game.player.id, direction)
+    position = move_response.player.position

settings_template.py

@@ -2,18 +2,49 @@ import logging
 
 from hopper.models.config import (
     BoardSettings,
+    DebugSettings,
     GameSettings,
     InactivityWatchdogSettings,
     Settings,
     WSServerSettings,
 )
+from hopper.models.player import Player, Position
+from hopper.models.product import Product
 
 settings = Settings(
     game=GameSettings(),
-    board=BoardSettings(),
+    board=BoardSettings(
+        WIDTH=20,
+        HEIGHT=20,
+        OBSTACLE_COUNT=10,
+    ),
     inacivity_watchdog=InactivityWatchdogSettings(),
+    purchase_timeout=5,
     log_level=logging.INFO,
+    products=[
+        Product(name="CocaCola", id="cocacola-id"),
+        Product(name="Pepsi", id="pepsi-id"),
+        Product(name="Fanta", id="fanta-id"),
+        Product(name="Snickers", id="snickers-id"),
+        Product(name="Mars", id="mars-id"),
+        Product(name="Burek", id="burek-id"),
+    ],
     ws_server=WSServerSettings(),
-    purchase_timeout=10,
+    debug=DebugSettings(
-    debug=None,
+        PRINT_BOARD=True,
+        PLAYERS=[
+            Player(
+                name="Pero",
+                id="test-player-pero",
+                position=Position(x=9, y=10),
+                can_be_deactivated=False,
+            ),
+            Player(
+                name="Mirko",
+                id="test-player-mirko",
+                position=Position(x=10, y=5),
+                can_be_deactivated=False,
+            ),
+        ],
+    ),
 )