Amazon Q CLI に Phoenix LiveView でゲームを作ってもらいました

## はじめに

Amazon Q CLI でゲームを作ろう Tシャツキャンペーンに応募します！

https://aws.amazon.com/jp/blogs/news/build-games-with-amazon-q-cli-and-score-a-t-shirt/

せっかくなので、 Elixir の Phoenix LiveView で作ってもらいます

Amazon Q CLI が実装したコードはこちら

https://github.com/RyoWakabayashi/brock_breaker_liveview

## Amazon Q CLI とは

本人に聞いてみました

```bash
> Amazon Q CLI とは何ですか
```

> Amazon Q CLI は、AWS が提供するコマンドラインインターフェース（CLI）ツールです。これを使用すると、ターミナルやコマンドプロンプトから直接 Amazon Q の AI アシスタント機能にアクセスできます。
> 
> 主な特徴:
> • ターミナル内で AI アシスタントと対話できる
> • ローカルファイルシステムの操作（ファイルの読み書き、ディレクトリの一覧表示など）
> • Bash コマンドの実行
> • AWS CLI 呼び出しによる AWS リソースの管理・照会
> • コードの作成や修正のサポート
> • AWS サービスに関する質問への回答
> • インフラストラクチャコードや設定のサポート
> • ベストプラクティスのガイダンス
> • トラブルシューティングのサポート
> 
> 現在、あなたは q chat コマンドを使用して私（Amazon Q）と対話しています。より詳細な使用方法については、q --help コマンドを実行すると確認できます。

```bash
> 仕組みを Mermaid.jsの図で表してください
```

> Mermaid.js を使って Amazon Q CLI の仕組みを図で表現します。以下のコードをファイルに保存して、Mermaid.js レンダラーで表示できます：
> 
> 
> 🛠️  Using tool: fs_write
>  ⋮
>  ● Path: /Users/rwakabay/amazon_q_cli_diagram.md
> 
> ```mermaid
> graph TD
>     User[ユーザー] <--> CLI[Amazon Q CLI]
>     CLI <--> Cloud[Amazon Q AIサービス]
>     
>     subgraph "ローカル環境"
>         CLI --> FS[ファイルシステム]
>         CLI --> Bash[Bashコマンド実行]
>         CLI --> AWSCLI[AWS CLI呼び出し]
>     end
>     
>     subgraph "AWS クラウド"
>         Cloud --> LLM[大規模言語モデル]
>         Cloud --> Services[AWSサービス情報]
>         Cloud --> CodeGen[コード生成エンジン]
>     end
>     
>     FS --> CLI
>     Bash --> CLI
>     AWSCLI --> CLI
> ```
> 
> Amazon Q CLI の仕組みを Mermaid.js で表現した図を作成し、amazon_q_cli_diagram.md というファイルに保存しました。この図は以下のような構造を示しています：
> 
> 1. ユーザーとの対話:
>    • ユーザーが Amazon Q CLI と対話
>    • CLI が Amazon Q AI サービスと通信
> 
> 2. ローカル環境での操作:
>    • ファイルシステムの操作
>    • Bash コマンドの実行
>    • AWS CLI の呼び出し
> 
> 3. AWS クラウド側の処理:
>    • 大規模言語モデルによる処理
>    • AWS サービス情報の提供
>    • コード生成エンジンの活用
> 
> この Mermaid.js コードをブラウザベースの Mermaid エディタ（例：<https://mermaid.live>）にコピー＆ペーストすると、視覚的な図として表示できます。また、多くのマークダウンエディタや GitHub などでも、このコードを含むマークダウンファイルを開くと図として表示されます。

料金は以下を参照してください

今回は無料利用枠で使用しますが、無料で十分ゲームを実装できました

https://aws.amazon.com/jp/q/developer/pricing/

## Amazon Q CLI のインストール

Amazon Builder ID に登録します

https://community.aws/builderid

公式の手順に従って Amazon Q CLI をインストールします

https://docs.aws.amazon.com/amazonq/latest/qdeveloper-ug/command-line-installing.html

## Amazon Q CLI への指示

`q` コマンドを実行すると、 Amazon Q CLI とのチャットが開始されます

```
❯ q

    ⢠⣶⣶⣦⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⣶⣿⣿⣿⣶⣦⡀⠀
 ⠀⠀⠀⣾⡿⢻⣿⡆⠀⠀⠀⢀⣄⡄⢀⣠⣤⣤⡀⢀⣠⣤⣤⡀⠀⠀⢀⣠⣤⣤⣤⣄⠀⠀⢀⣤⣤⣤⣤⣤⣤⡀⠀⠀⣀⣤⣤⣤⣀⠀⠀⠀⢠⣤⡀⣀⣤⣤⣄⡀⠀⠀⠀⠀⠀⠀⢠⣿⣿⠋⠀⠀⠀⠙⣿⣿⡆
 ⠀⠀⣼⣿⠇⠀⣿⣿⡄⠀⠀⢸⣿⣿⠛⠉⠻⣿⣿⠛⠉⠛⣿⣿⠀⠀⠘⠛⠉⠉⠻⣿⣧⠀⠈⠛⠛⠛⣻⣿⡿⠀⢀⣾⣿⠛⠉⠻⣿⣷⡀⠀⢸⣿⡟⠛⠉⢻⣿⣷⠀⠀⠀⠀⠀⠀⣼⣿⡏⠀⠀⠀⠀⠀⢸⣿⣿
 ⠀⢰⣿⣿⣤⣤⣼⣿⣷⠀⠀⢸⣿⣿⠀⠀⠀⣿⣿⠀⠀⠀⣿⣿⠀⠀⢀⣴⣶⣶⣶⣿⣿⠀⠀⠀⣠⣾⡿⠋⠀⠀⢸⣿⣿⠀⠀⠀⣿⣿⡇⠀⢸⣿⡇⠀⠀⢸⣿⣿⠀⠀⠀⠀⠀⠀⢹⣿⣇⠀⠀⠀⠀⠀⢸⣿⡿
 ⢀⣿⣿⠋⠉⠉⠉⢻⣿⣇⠀⢸⣿⣿⠀⠀⠀⣿⣿⠀⠀⠀⣿⣿⠀⠀⣿⣿⡀⠀⣠⣿⣿⠀⢀⣴⣿⣋⣀⣀⣀⡀⠘⣿⣿⣄⣀⣠⣿⣿⠃⠀⢸⣿⡇⠀⠀⢸⣿⣿⠀⠀⠀⠀⠀⠀⠈⢿⣿⣦⣀⣀⣀⣴⣿⡿⠃
 ⠚⠛⠋⠀⠀⠀⠀⠘⠛⠛⠀⠘⠛⠛⠀⠀⠀⠛⠛⠀⠀⠀⠛⠛⠀⠀⠙⠻⠿⠟⠋⠛⠛⠀⠘⠛⠛⠛⠛⠛⠛⠃⠀⠈⠛⠿⠿⠿⠛⠁⠀⠀⠘⠛⠃⠀⠀⠘⠛⠛⠀⠀⠀⠀⠀⠀⠀⠀⠙⠛⠿⢿⣿⣿⣋⠀⠀
 ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠛⠿⢿⡧

╭─────────────────────────────── Did you know? ────────────────────────────────╮
│                                                                              │
│         Use /model to select the model to use for this conversation          │
│                                                                              │
╰──────────────────────────────────────────────────────────────────────────────╯

/help all commands  •  ctrl + j new lines  •  ctrl + s fuzzy search
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🤖 You are chatting with claude-3.7-sonnet
```

以下のように指示を与えてみました

> Phoenix LiveView を使って、ブラウザで遊べるブロック崩しを作ってください。データベースは不要です。

すると、以下のように Elixir のバージョンを確認しようとします

信頼しているので、 `t` （Trust） と回答し、以降のコマンドの実行を許可します

```
I'll help you create a block breaker game using Phoenix LiveView that can be played in the browser without requiring a database. Let's build this step by step.

First, let's create a new Phoenix project with LiveView:


🛠️  Using tool: execute_bash
 ⋮
 ● I will run the following shell command: mix --version
 ⋮
 ↳ Purpose: Checking if Elixir and Mix are installed


Allow this action? Use 't' to trust (always allow) this tool for the session. [y/n/t]:

>
```

プロジェクトの作成が開始され、以下の表示で一旦停止します

```
Erlang/OTP 27 [erts-15.2.3] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]

Mix 1.18.4 (compiled with Erlang/OTP 25)

 ⋮
 ● Completed in 0.284s



🛠️  Using tool: execute_bash (trusted)
 ⋮
 ● I will run the following shell command:
cd /Users/rwakabay && mix phx.new block_breaker --no-ecto --no-mailer --no-dashboard
 ⋮
 ↳ Purpose: Creating a new Phoenix LiveView project

* creating block_breaker/lib/block_breaker/application.ex
* creating block_breaker/lib/block_breaker.ex
* creating block_breaker/lib/block_breaker_web/controllers/error_json.ex
* creating block_breaker/lib/block_breaker_web/endpoint.ex
* creating block_breaker/lib/block_breaker_web/router.ex
* creating block_breaker/lib/block_breaker_web/telemetry.ex
* creating block_breaker/lib/block_breaker_web.ex
* creating block_breaker/mix.exs
* creating block_breaker/README.md
* creating block_breaker/.formatter.exs
* creating block_breaker/.gitignore
* creating block_breaker/test/support/conn_case.ex
* creating block_breaker/test/test_helper.exs
* creating block_breaker/test/block_breaker_web/controllers/error_json_test.exs
* creating block_breaker/lib/block_breaker_web/controllers/error_html.ex
* creating block_breaker/test/block_breaker_web/controllers/error_html_test.exs
* creating block_breaker/lib/block_breaker_web/components/core_components.ex
* creating block_breaker/lib/block_breaker_web/controllers/page_controller.ex
* creating block_breaker/lib/block_breaker_web/controllers/page_html.ex
* creating block_breaker/lib/block_breaker_web/controllers/page_html/home.html.heex
* creating block_breaker/test/block_breaker_web/controllers/page_controller_test.exs
* creating block_breaker/lib/block_breaker_web/components/layouts/root.html.heex
* creating block_breaker/lib/block_breaker_web/components/layouts/app.html.heex
* creating block_breaker/lib/block_breaker_web/components/layouts.ex
* creating block_breaker/priv/static/images/logo.svg
* creating block_breaker/lib/block_breaker_web/gettext.ex
* creating block_breaker/priv/gettext/en/LC_MESSAGES/errors.po
* creating block_breaker/priv/gettext/errors.pot
* creating block_breaker/priv/static/robots.txt
* creating block_breaker/priv/static/favicon.ico
* creating block_breaker/assets/js/app.js
* creating block_breaker/assets/vendor/topbar.js
* creating block_breaker/assets/css/app.css
* creating block_breaker/assets/tailwind.config.js
```

実は `Fetch and install dependencies? [Yn]` の質問で止まっているので、 Enter キーを押すと進みます

<details><summary>Amazon Q CLI の出力を表示</summary><div>

```
Fetch and install dependencies? [Yn] * running mix deps.get
* running mix assets.setup
* running mix deps.compile

We are almost there! The following steps are missing:

    $ cd block_breaker

Start your Phoenix app with:

    $ mix phx.server

You can also run your app inside IEx (Interactive Elixir) as:

    $ iex -S mix phx.server


 ⋮
 ● Completed in 138.519s
Now, let's create a LiveView for our block breaker game. First, let's navigate to the project directory:


🛠️  Using tool: execute_bash (trusted)
 ⋮
 ● I will run the following shell command:
cd /Users/rwakabay/block_breaker
 ⋮
 ↳ Purpose: Changing to the project directory


 ⋮
 ● Completed in 0.5s
Let's create a new LiveView for our game:



🛠️  Using tool: fs_write
 ⋮
 ● Path: /Users/rwakabay/block_breaker/lib/block_breaker_web/live/game_live.ex

+      1: defmodule BlockBreakerWeb.GameLive do
+      2:   use BlockBreakerWeb, :live_view
+      3:
+      4:   @paddle_width 100
+      5:   @paddle_height 20
+      6:   @ball_radius 10
+      7:   @block_width 60
+      8:   @block_height 20
+      9:   @block_rows 5
+     10:   @block_cols 10
+     11:   @game_width 600
+     12:   @game_height 500
+     13:   @ball_speed 5
+     14:   @tick_rate 16 # roughly 60 FPS
+     15:
+     16:   def mount(_params, _session, socket) do
+     17:     if connected?(socket) do
+     18:       :timer.send_interval(@tick_rate, self(), :tick)
+     19:     end
+     20:
+     21:     {:ok,
+     22:      socket
+     23:      |> assign(
+     24:        game_state: :ready, # :ready, :playing, :game_over
+     25:        paddle_x: (@game_width - @paddle_width) / 2,
+     26:        ball_x: @game_width / 2,
+     27:        ball_y: @game_height - @paddle_height - @ball_radius - 10,
+     28:        ball_dx: @ball_speed,
+     29:        ball_dy: -@ball_speed,
+     30:        blocks: initialize_blocks(),
+     31:        score: 0
+     32:      )}
+     33:   end
+     34:
+     35:   def render(assigns) do
+     36:     ~H"""
+     37:     <div class="game-container" phx-window-keydown="keydown" phx-window-keyup="keyup">
+     38:       <div class="game-info">
+     39:         <div class="score">Score: <%= @score %></div>
+     40:         <div class="status">
+     41:           <%= case @game_state do %>
+     42:             <% :ready -> %>
+     43:               Press Space to Start
+     44:             <% :playing -> %>
+     45:               Playing
+     46:             <% :game_over -> %>
+     47:               Game Over - Press Space to Restart
+     48:           <% end %>
+     49:         </div>
+     50:       </div>
+     51:       <div class="game-board" phx-window-mousemove="mousemove">
+     52:         <svg width={@game_width} height={@game_height} style="background-color: #f0f0f0; border: 1px solid #ccc;">
+     53:           <!-- Paddle -->
+     54:           <rect
+     55:             x={@paddle_x}
+     56:             y={@game_height - @paddle_height}
+     57:             width={@paddle_width}
+     58:             height={@paddle_height}
+     59:             fill="#333"
+     60:           />
+     61:
+     62:           <!-- Ball -->
+     63:           <circle
+     64:             cx={@ball_x}
+     65:             cy={@ball_y}
+     66:             r={@ball_radius}
+     67:             fill="#c00"
+     68:           />
+     69:
+     70:           <!-- Blocks -->
+     71:           <%= for block <- @blocks do %>
+     72:             <rect
+     73:               x={block.x}
+     74:               y={block.y}
+     75:               width={@block_width}
+     76:               height={@block_height}
+     77:               fill={block.color}
+     78:               stroke="#333"
+     79:               stroke-width="1"
+     80:             />
+     81:           <% end %>
+     82:         </svg>
+     83:       </div>
+     84:     </div>
+     85:     """
+     86:   end
+     87:
+     88:   def handle_event("keydown", %{"key" => " "}, socket) do
+     89:     case socket.assigns.game_state do
+     90:       :ready -> {:noreply, socket |> assign(game_state: :playing)}
+     91:       :game_over -> {:noreply, reset_game(socket)}
+     92:       _ -> {:noreply, socket}
+     93:     end
+     94:   end
+     95:
+     96:   def handle_event("keydown", %{"key" => "ArrowLeft"}, socket) do
+     97:     new_x = max(0, socket.assigns.paddle_x - 20)
+     98:     {:noreply, socket |> assign(paddle_x: new_x)}
+     99:   end
+    100:
+    101:   def handle_event("keydown", %{"key" => "ArrowRight"}, socket) do
+    102:     new_x = min(@game_width - @paddle_width, socket.assigns.paddle_x + 20)
+    103:     {:noreply, socket |> assign(paddle_x: new_x)}
+    104:   end
+    105:
+    106:   def handle_event("keydown", _key, socket), do: {:noreply, socket}
+    107:   def handle_event("keyup", _key, socket), do: {:noreply, socket}
+    108:
+    109:   def handle_event("mousemove", %{"clientX" => client_x}, socket) do
+    110:     # Get the SVG element's position relative to the viewport
+    111:     # This is a simplification - in a real app you might need to calculate this more precisely
+    112:     new_x = max(0, min(client_x - @paddle_width / 2, @game_width - @paddle_width))
+    113:     {:noreply, socket |> assign(paddle_x: new_x)}
+    114:   end
+    115:
+    116:   def handle_info(:tick, %{assigns: %{game_state: :playing}} = socket) do
+    117:     socket = update_game_state(socket)
+    118:     {:noreply, socket}
+    119:   end
+    120:
+    121:   def handle_info(:tick, socket), do: {:noreply, socket}
+    122:
+    123:   defp update_game_state(socket) do
+    124:     %{
+    125:       ball_x: ball_x,
+    126:       ball_y: ball_y,
+    127:       ball_dx: ball_dx,
+    128:       ball_dy: ball_dy,
+    129:       paddle_x: paddle_x,
+    130:       blocks: blocks,
+    131:       score: score
+    132:     } = socket.assigns
+    133:
+    134:     # Calculate new ball position
+    135:     new_ball_x = ball_x + ball_dx
+    136:     new_ball_y = ball_y + ball_dy
+    137:
+    138:     # Check for wall collisions
+    139:     {new_ball_dx, adjusted_ball_x} =
+    140:       cond do
+    141:         new_ball_x - @ball_radius <= 0 -> {abs(ball_dx), @ball_radius}
+    142:         new_ball_x + @ball_radius >= @game_width -> {-abs(ball_dx), @game_width - @ball_radius}
+    143:         true -> {ball_dx, new_ball_x}
+    144:       end
+    145:
+    146:     {new_ball_dy, adjusted_ball_y} =
+    147:       cond do
+    148:         new_ball_y - @ball_radius <= 0 -> {abs(ball_dy), @ball_radius}
+    149:         true -> {ball_dy, new_ball_y}
+    150:       end
+    151:
+    152:     # Check for paddle collision
+    153:     {new_ball_dy, new_ball_dx} =
+    154:       if adjusted_ball_y + @ball_radius >= @game_height - @paddle_height &&
+    155:            adjusted_ball_x >= paddle_x &&
+    156:            adjusted_ball_x <= paddle_x + @paddle_width do
+    157:         # Calculate bounce angle based on where the ball hit the paddle
+    158:         # Center of paddle = 0, left edge = -1, right edge = 1
+    159:         relative_intersect_x = (adjusted_ball_x - (paddle_x + @paddle_width / 2)) / (@paddle_width / 2)
+    160:         bounce_angle = relative_intersect_x * (5 * :math.pi / 12) # Max angle: 75 degrees
+    161:
+    162:         speed = :math.sqrt(ball_dx * ball_dx + ball_dy * ball_dy)
+    163:
+    164:         {
+    165:           -abs(ball_dy), # Always bounce up
+    166:           speed * :math.sin(bounce_angle) # Adjust horizontal direction based on hit position
+    167:         }
+    168:       else
+    169:         {new_ball_dy, new_ball_dx}
+    170:       end
+    171:
+    172:     # Check for block collisions
+    173:     {new_blocks, new_score, final_ball_dx, final_ball_dy} =
+    174:       check_block_collisions(blocks, adjusted_ball_x, adjusted_ball_y, new_ball_dx, new_ball_dy, score)
+    175:
+    176:     # Check for game over
+    177:     game_state =
+    178:       if adjusted_ball_y + @ball_radius >= @game_height do
+    179:         :game_over
+    180:       else
+    181:         socket.assigns.game_state
+    182:       end
+    183:
+    184:     # Check for win condition
+    185:     game_state =
+    186:       if new_blocks == [] do
+    187:         :game_over
+    188:       else
+    189:         game_state
+    190:       end
+    191:
+    192:     socket
+    193:     |> assign(
+    194:       ball_x: adjusted_ball_x,
+    195:       ball_y: adjusted_ball_y,
+    196:       ball_dx: final_ball_dx,
+    197:       ball_dy: final_ball_dy,
+    198:       blocks: new_blocks,
+    199:       score: new_score,
+    200:       game_state: game_state
+    201:     )
+    202:   end
+    203:
+    204:   defp check_block_collisions(blocks, ball_x, ball_y, ball_dx, ball_dy, score) do
+    205:     Enum.reduce(blocks, {[], score, ball_dx, ball_dy}, fn block, {remaining_blocks, current_score, current_dx, current_dy} ->
+    206:       if block_collision?(block, ball_x, ball_y, @ball_radius) do
+    207:         # Determine which side of the block was hit
+    208:         {new_dx, new_dy} = calculate_bounce(block, ball_x, ball_y, current_dx, current_dy)
+    209:         {remaining_blocks, current_score + 10, new_dx, new_dy}
+    210:       else
+    211:         {[block | remaining_blocks], current_score, current_dx, current_dy}
+    212:       end
+    213:     end)
+    214:   end
+    215:
+    216:   defp block_collision?(block, ball_x, ball_y, ball_radius) do
+    217:     # Find the closest point on the rectangle to the circle
+    218:     closest_x = max(block.x, min(ball_x, block.x + @block_width))
+    219:     closest_y = max(block.y, min(ball_y, block.y + @block_height))
+    220:
+    221:     # Calculate the distance between the closest point and the circle's center
+    222:     distance_x = ball_x - closest_x
+    223:     distance_y = ball_y - closest_y
+    224:     distance_squared = distance_x * distance_x + distance_y * distance_y
+    225:
+    226:     # If the distance is less than the circle's radius, there's a collision
+    227:     distance_squared < (ball_radius * ball_radius)
+    228:   end
+    229:
+    230:   defp calculate_bounce(block, ball_x, ball_y, ball_dx, ball_dy) do
+    231:     # Calculate the center of the block
+    232:     block_center_x = block.x + @block_width / 2
+    233:     block_center_y = block.y + @block_height / 2
+    234:
+    235:     # Determine if the collision is more horizontal or vertical
+    236:     dx = abs(ball_x - block_center_x) / (@block_width / 2)
+    237:     dy = abs(ball_y - block_center_y) / (@block_height / 2)
+    238:
+    239:     if dx > dy do
+    240:       # Horizontal collision
+    241:       {-ball_dx, ball_dy}
+    242:     else
+    243:       # Vertical collision
+    244:       {ball_dx, -ball_dy}
+    245:     end
+    246:   end
+    247:
+    248:   defp initialize_blocks do
+    249:     colors = ["#f44336", "#e91e63", "#9c27b0", "#3f51b5", "#2196f3"]
+    250:
+    251:     for row <- 0..(@block_rows - 1),
+    252:         col <- 0..(@block_cols - 1) do
+    253:       %{
+    254:         x: col * (@block_width + 5) + 10,
+    255:         y: row * (@block_height + 5) + 30,
+    256:         color: Enum.at(colors, rem(row, length(colors)))
+    257:       }
+    258:     end
+    259:   end
+    260:
+    261:   defp reset_game(socket) do
+    262:     socket
+    263:     |> assign(
+    264:       game_state: :ready,
+    265:       paddle_x: (@game_width - @paddle_width) / 2,
+    266:       ball_x: @game_width / 2,
+    267:       ball_y: @game_height - @paddle_height - @ball_radius - 10,
+    268:       ball_dx: @ball_speed,
+    269:       ball_dy: -@ball_speed,
+    270:       blocks: initialize_blocks(),
+    271:       score: 0
+    272:     )
+    273:   end
+    274: end


Allow this action? Use 't' to trust (always allow) this tool for the session. [y/n/t]:

>
```

</div></details>

ファイルの作成について確認してくるので、また `t` で応答します

<details><summary>Amazon Q CLI の出力を表示</summary><div>

```
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  1,  1: @import "tailwindcss/base";
  2,  2: @import "tailwindcss/components";
  3,  3: @import "tailwindcss/utilities";
+     4:
+     5: /* Game styles */
+     6: .game-container {
+     7:   display: flex;
+     8:   flex-direction: column;
+     9:   align-items: center;
+    10:   padding: 20px;
+    11:   font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+    12: }
+    13:
+    14: .game-info {
+    15:   display: flex;
+    16:   justify-content: space-between;
+    17:   width: 600px;
+    18:   margin-bottom: 10px;
+    19:   font-size: 1.2rem;
+    20:   font-weight: bold;
+    21: }
+    22:
+    23: .game-board {
+    24:   cursor: none;
+    25: }
+    26:
+    27: .status {
+    28:   color: #c00;
+    29: }

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  17, 17:   scope "/", BlockBreakerWeb do
  18, 18:     pipe_through :browser
  19, 19:
  20, 20:     get "/", PageController, :home
+     21:     live "/game", GameLive
  21, 22:   end

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- 0   : <main class="px-4 py-20 sm:px-6 lg:px-8">
- 1   :   <div class="mx-auto max-w-2xl">
+    0: <main class="px-4 py-8 sm:px-6 lg:px-8">
+    1:   <div class="mx-auto max-w-4xl">
  2, 2:     <.flash_group flash={@flash} />
  3, 3:     <%= @inner_content %>
  4, 4:   </div>
  5, 5: </main>

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    <%= @inner_content %>
  </div>
</main>" were found




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   1,  1: <header class="px-4 sm:px-6 lg:px-8">
   2,  2:   <div class="flex items-center justify-between border-b border-zinc-100 py-3 text-sm">
   3,  3:     <div class="flex items-center gap-4">
   4,  4:       <a href="/">
   5,  5:         <img src={~p"/images/logo.svg"} width="36" />
   6,  6:       </a>
   7,  7:       <p class="bg-brand/5 text-brand rounded-full px-2 font-medium leading-6">
-  8    :         v{Application.spec(:phoenix, :vsn)}
+      8:         Block Breaker Game
   9,  9:       </p>
  10, 10:     </div>
  11, 11:     <div class="flex items-center gap-4 font-semibold leading-6 text-zinc-900">
- 12    :       <a href="https://twitter.com/elixirphoenix" class="hover:text-zinc-700">
- 13    :         @elixirphoenix
- 14    :       </a>
- 15    :       <a href="https://github.com/phoenixframework/phoenix" class="hover:text-zinc-700">
- 16    :         GitHub
- 17    :       </a>
- 18    :       <a
- 19    :         href="https://hexdocs.pm/phoenix/overview.html"
- 20    :         class="rounded-lg bg-zinc-100 px-2 py-1 hover:bg-zinc-200/80"
- 21    :       >
- 22    :         Get Started <span aria-hidden="true">&rarr;</span>
+     12:       <a href="/game" class="rounded-lg bg-zinc-100 px-2 py-1 hover:bg-zinc-200/80">
+     13:         Play Game <span aria-hidden="true">&rarr;</span>
  23, 14:       </a>
  24, 15:     </div>
  25, 16:   </div>
  26, 17: </header>
- 27    : <main class="px-4 py-20 sm:px-6 lg:px-8">
- 28    :   <div class="mx-auto max-w-2xl">
+     18: <main class="px-4 py-8 sm:px-6 lg:px-8">
+     19:   <div class="mx-auto max-w-4xl">
  29, 20:     <.flash_group flash={@flash} />
  30, 21:     {@inner_content}
  31, 22:   </div>
- 32    : </main>
+     23: </main>

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-   5    :     fill="none"
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-   7    :     class="absolute inset-0 h-full w-full"
-   8    :     preserveAspectRatio="xMinYMid slice"
-   9    :   >
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-  46    :         fill="#FD4F00"
-  47    :       />
-  48    :     </svg>
-  49    :     <h1 class="text-brand mt-10 flex items-center text-sm font-semibold leading-6">
-  50    :       Phoenix Framework
-  51    :       <small class="bg-brand/5 text-[0.8125rem] ml-3 rounded-full px-2 font-medium leading-6">
-  52    :         v{Application.spec(:phoenix, :vsn)}
-  53    :       </small>
-  54    :     </h1>
-  55    :     <p class="text-[2rem] mt-4 font-semibold leading-10 tracking-tighter text-zinc-900 text-balance">
-  56    :       Peace of mind from prototype to production.
-  57    :     </p>
-  58    :     <p class="mt-4 text-base leading-7 text-zinc-600">
-  59    :       Build rich, interactive web applications quickly, with less code and fewer moving parts. Join our growing community of developers using Phoenix to craft APIs, HTML5 apps and more, for fun or at scale.
-  60    :     </p>
-  61    :     <div class="flex">
-  62    :       <div class="w-full sm:w-auto">
-  63    :         <div class="mt-10 grid grid-cols-1 gap-x-6 gap-y-4 sm:grid-cols-3">
-  64    :           <a
-  65    :             href="https://hexdocs.pm/phoenix/overview.html"
-  66    :             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
-  67    :           >
-  68    :             <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
-  69    :             </span>
-  70    :             <span class="relative flex items-center gap-4 sm:flex-col">
-  71    :               <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" class="h-6 w-6">
-  72    :                 <path d="m12 4 10-2v18l-10 2V4Z" fill="#18181B" fill-opacity=".15" />
-  73    :                 <path
-  74    :                   d="M12 4 2 2v18l10 2m0-18v18m0-18 10-2v18l-10 2"
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-  76    :                   stroke-width="2"
-  77    :                   stroke-linecap="round"
-  78    :                   stroke-linejoin="round"
-  79    :                 />
-  80    :               </svg>
-  81    :               Guides &amp; Docs
-  82    :             </span>
-  83    :           </a>
-  84    :           <a
-  85    :             href="https://github.com/phoenixframework/phoenix"
-  86    :             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
-  87    :           >
-  88    :             <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
-  89    :             </span>
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-  96    :                   fill="#18181B"
-  97    :                 />
-  98    :               </svg>
-  99    :               Source Code
- 100    :             </span>
- 101    :           </a>
- 102    :           <a
- 103    :             href={"https://github.com/phoenixframework/phoenix/blob/v#{Application.spec(:phoenix, :vsn)}/CHANGELOG.md"}
- 104    :             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
- 105    :           >
- 106    :             <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
- 107    :             </span>
- 108    :             <span class="relative flex items-center gap-4 sm:flex-col">
- 109    :               <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" class="h-6 w-6">
- 110    :                 <path
- 111    :                   d="M12 1v6M12 17v6"
- 112    :                   stroke="#18181B"
- 113    :                   stroke-width="2"
- 114    :                   stroke-linecap="round"
- 115    :                   stroke-linejoin="round"
- 116    :                 />
- 117    :                 <circle
- 118    :                   cx="12"
- 119    :                   cy="12"
- 120    :                   r="4"
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- 123    :                   stroke="#18181B"
- 124    :                   stroke-width="2"
- 125    :                   stroke-linecap="round"
- 126    :                   stroke-linejoin="round"
- 127    :                 />
- 128    :               </svg>
- 129    :               Changelog
- 130    :             </span>
- 131    :           </a>
- 132    :         </div>
- 133    :         <div class="mt-10 grid grid-cols-1 gap-y-4 text-sm leading-6 text-zinc-700 sm:grid-cols-2">
- 134    :           <div>
- 135    :             <a
- 136    :               href="https://twitter.com/elixirphoenix"
- 137    :               class="group -mx-2 -my-0.5 inline-flex items-center gap-3 rounded-lg px-2 py-0.5 hover:bg-zinc-50 hover:text-zinc-900"
- 138    :             >
- 139    :               <svg
- 140    :                 viewBox="0 0 16 16"
- 141    :                 aria-hidden="true"
- 142    :                 class="h-4 w-4 fill-zinc-400 group-hover:fill-zinc-600"
- 143    :               >
- 144    :                 <path d="M5.403 14c5.283 0 8.172-4.617 8.172-8.62 0-.131 0-.262-.008-.391A6.033 6.033 0 0 0 15 3.419a5.503 5.503 0 0 1-1.65.477 3.018 3.018 0 0 0 1.263-1.676 5.579 5.579 0 0 1-1.824.736 2.832 2.832 0 0 0-1.63-.916 2.746 2.746 0 0 0-1.821.319A2.973 2.973 0 0 0 8.076 3.78a3.185 3.185 0 0 0-.182 1.938 7.826 7.826 0 0 1-3.279-.918 8.253 8.253 0 0 1-2.64-2.247 3.176 3.176 0 0 0-.315 2.208 3.037 3.037 0 0 0 1.203 1.836A2.739 2.739 0 0 1 1.56 6.22v.038c0 .7.23 1.377.65 1.919.42.54 1.004.912 1.654 1.05-.423.122-.866.14-1.297.052.184.602.541 1.129 1.022 1.506a2.78 2.78 0 0 0 1.662.598 5.656 5.656 0 0 1-2.007 1.074A5.475 5.475 0 0 1 1 12.64a7.827 7.827 0 0 0 4.403 1.358" />
- 145    :               </svg>
- 146    :               Follow on Twitter
- 147    :             </a>
- 148    :           </div>
- 149    :           <div>
- 150    :             <a
- 151    :               href="https://elixirforum.com"
- 152    :               class="group -mx-2 -my-0.5 inline-flex items-center gap-3 rounded-lg px-2 py-0.5 hover:bg-zinc-50 hover:text-zinc-900"
- 153    :             >
- 154    :               <svg
- 155    :                 viewBox="0 0 16 16"
- 156    :                 aria-hidden="true"
- 157    :                 class="h-4 w-4 fill-zinc-400 group-hover:fill-zinc-600"
- 158    :               >
- 159    :                 <path d="M8 13.833c3.866 0 7-2.873 7-6.416C15 3.873 11.866 1 8 1S1 3.873 1 7.417c0 1.081.292 2.1.808 2.995.606 1.05.806 2.399.086 3.375l-.208.283c-.285.386-.01.905.465.85.852-.098 2.048-.318 3.137-.81a3.717 3.717 0 0 1 1.91-.318c.263.027.53.041.802.041Z" />
- 160    :               </svg>
- 161    :               Discuss on the Elixir Forum
- 162    :             </a>
- 163    :           </div>
- 164    :           <div>
- 165    :             <a
- 166    :               href="https://web.libera.chat/#elixir"
- 167    :               class="group -mx-2 -my-0.5 inline-flex items-center gap-3 rounded-lg px-2 py-0.5 hover:bg-zinc-50 hover:text-zinc-900"
- 168    :             >
- 169    :               <svg
- 170    :                 viewBox="0 0 16 16"
- 171    :                 aria-hidden="true"
- 172    :                 class="h-4 w-4 fill-zinc-400 group-hover:fill-zinc-600"
- 173    :               >
- 174    :                 <path
- 175    :                   fill-rule="evenodd"
- 176    :                   clip-rule="evenodd"
- 177    :                   d="M6.356 2.007a.75.75 0 0 1 .637.849l-1.5 10.5a.75.75 0 1 1-1.485-.212l1.5-10.5a.75.75 0 0 1 .848-.637ZM11.356 2.008a.75.75 0 0 1 .637.848l-1.5 10.5a.75.75 0 0 1-1.485-.212l1.5-10.5a.75.75 0 0 1 .848-.636Z"
- 178    :                 />
- 179    :                 <path
- 180    :                   fill-rule="evenodd"
- 181    :                   clip-rule="evenodd"
- 182    :                   d="M14 5.25a.75.75 0 0 1-.75.75h-9.5a.75.75 0 0 1 0-1.5h9.5a.75.75 0 0 1 .75.75ZM13 10.75a.75.75 0 0 1-.75.75h-9.5a.75.75 0 0 1 0-1.5h9.5a.75.75 0 0 1 .75.75Z"
- 183    :                 />
- 184    :               </svg>
- 185    :               Chat on Libera IRC
- 186    :             </a>
- 187    :           </div>
- 188    :           <div>
- 189    :             <a
- 190    :               href="https://discord.gg/elixir"
- 191    :               class="group -mx-2 -my-0.5 inline-flex items-center gap-3 rounded-lg px-2 py-0.5 hover:bg-zinc-50 hover:text-zinc-900"
- 192    :             >
- 193    :               <svg
- 194    :                 viewBox="0 0 16 16"
- 195    :                 aria-hidden="true"
- 196    :                 class="h-4 w-4 fill-zinc-400 group-hover:fill-zinc-600"
- 197    :               >
- 198    :                 <path d="M13.545 2.995c-1.02-.46-2.114-.8-3.257-.994a.05.05 0 0 0-.052.024c-.141.246-.297.567-.406.82a12.377 12.377 0 0 0-3.658 0 8.238 8.238 0 0 0-.412-.82.052.052 0 0 0-.052-.024 13.315 13.315 0 0 0-3.257.994.046.046 0 0 0-.021.018C.356 6.063-.213 9.036.066 11.973c.001.015.01.029.02.038a13.353 13.353 0 0 0 3.996 1.987.052.052 0 0 0 .056-.018c.308-.414.582-.85.818-1.309a.05.05 0 0 0-.028-.069 8.808 8.808 0 0 1-1.248-.585.05.05 0 0 1-.005-.084c.084-.062.168-.126.248-.191a.05.05 0 0 1 .051-.007c2.619 1.176 5.454 1.176 8.041 0a.05.05 0 0 1 .053.006c.08.065.164.13.248.192a.05.05 0 0 1-.004.084c-.399.23-.813.423-1.249.585a.05.05 0 0 0-.027.07c.24.457.514.893.817 1.307a.051.051 0 0 0 .056.019 13.31 13.31 0 0 0 4.001-1.987.05.05 0 0 0 .021-.037c.334-3.396-.559-6.345-2.365-8.96a.04.04 0 0 0-.021-.02Zm-8.198 7.19c-.789 0-1.438-.712-1.438-1.587 0-.874.637-1.586 1.438-1.586.807 0 1.45.718 1.438 1.586 0 .875-.637 1.587-1.438 1.587Zm5.316 0c-.788 0-1.438-.712-1.438-1.587 0-.874.637-1.586 1.438-1.586.807 0 1.45.718 1.438 1.586 0 .875-.63 1.587-1.438 1.587Z" />
- 199    :               </svg>
- 200    :               Join our Discord server
- 201    :             </a>
- 202    :           </div>
- 203    :           <div>
- 204    :             <a
- 205    :               href="https://fly.io/docs/elixir/getting-started/"
- 206    :               class="group -mx-2 -my-0.5 inline-flex items-center gap-3 rounded-lg px-2 py-0.5 hover:bg-zinc-50 hover:text-zinc-900"
- 207    :             >
- 208    :               <svg
- 209    :                 viewBox="0 0 20 20"
- 210    :                 aria-hidden="true"
- 211    :                 class="h-4 w-4 fill-zinc-400 group-hover:fill-zinc-600"
- 212    :               >
- 213    :                 <path d="M1 12.5A4.5 4.5 0 005.5 17H15a4 4 0 001.866-7.539 3.504 3.504 0 00-4.504-4.272A4.5 4.5 0 004.06 8.235 4.502 4.502 0 001 12.5z" />
- 214    :               </svg>
- 215    :               Deploy your application
- 216    :             </a>
- 217    :           </div>
- 218    :         </div>
- 219    :       </div>
- 220    :     </div>
+       1: <div class="flex flex-col items-center justify-center py-10">
+       2:   <h1 class="text-4xl font-bold mb-6">Block Breaker Game</h1>
+       3:   <p class="text-xl mb-8">A simple block breaker game built with Phoenix LiveView</p>
+       4:   <a href="/game" class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-3 px-6 rounded-lg text-xl">
+       5:     Play Now
+       6:   </a>
+       7:
+       8:   <div class="mt-12 p-6 bg-gray-100 rounded-lg max-w-lg">
+       9:     <h2 class="text-2xl font-bold mb-4">How to Play</h2>
+      10:     <ul class="list-disc pl-5 space-y-2">
+      11:       <li>Press <strong>Space</strong> to start the game</li>
+      12:       <li>Move the paddle with your <strong>mouse</strong> or <strong>arrow keys</strong></li>
+      13:       <li>Break all the blocks to win</li>
+      14:       <li>Don't let the ball fall below the paddle</li>
+      15:     </ul>
  221, 16:   </div>
- 222    : </div>
+      17: </div>

Replacing: block_breaker/lib/block_breaker_web/controllers/page_html/home.html.heex

 ⋮
 ● Completed in 0.0s



🛠️  Using tool: execute_bash (trusted)
 ⋮
 ● I will run the following shell command:
cd /Users/rwakabay/block_breaker && mix phx.server
 ⋮
 ↳ Purpose: Starting the Phoenix server

Compiling 14 files (.ex)
Generated block_breaker app
[info] Running BlockBreakerWeb.Endpoint with Bandit 1.7.0 at 127.0.0.1:4000 (http)
[info] Access BlockBreakerWeb.Endpoint at http://localhost:4000
[watch] build finished, watching for changes...

Rebuilding...

Done in 141ms.
```

</div></details>

Phoenix の起動まで自動的に行ってくれました

<http://localhost:4000> にアクセスすると、以下のように表示されます

![スクリーンショット 2025-06-13 23.40.53.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/1485835/aacb95d9-1e5d-42d0-bc0f-3a0c12322658.png)

Play Now をクリックすると、エラーになりました

![スクリーンショット 2025-06-13 23.41.47.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/1485835/1a15594c-be4d-42bd-9802-2a4f5b59ac02.png)

Amazon Q CLI 側にもエラー出力が出ています

<details><summary>Amazon Q CLI の出力を表示</summary><div>

```
[error] ** (KeyError) key :game_width not found in: %{
  socket: #Phoenix.LiveView.Socket<
    id: "phx-GEihMB83MU4F6QWC",
    endpoint: BlockBreakerWeb.Endpoint,
    view: BlockBreakerWeb.GameLive,
    parent_pid: nil,
    root_pid: nil,
    router: BlockBreakerWeb.Router,
    assigns: #Phoenix.LiveView.Socket.AssignsNotInSocket<>,
    transport_pid: nil,
    sticky?: false,
    ...
  >,
  blocks: [
    %{y: 30, x: 10, color: "#f44336"},
    %{y: 30, x: 75, color: "#f44336"},
    %{y: 30, x: 140, color: "#f44336"},
    %{y: 30, x: 205, color: "#f44336"},
    %{y: 30, x: 270, color: "#f44336"},
    %{y: 30, x: 335, color: "#f44336"},
    %{y: 30, x: 400, color: "#f44336"},
    %{y: 30, x: 465, color: "#f44336"},
    %{y: 30, x: 530, color: "#f44336"},
    %{y: 30, x: 595, color: "#f44336"},
    %{y: 55, x: 10, color: "#e91e63"},
    %{y: 55, x: 75, color: "#e91e63"},
    %{y: 55, x: 140, color: "#e91e63"},
    %{y: 55, x: 205, color: "#e91e63"},
    %{y: 55, x: 270, color: "#e91e63"},
    %{y: 55, x: 335, color: "#e91e63"},
    %{y: 55, x: 400, color: "#e91e63"},
    %{y: 55, x: 465, color: "#e91e63"},
    %{y: 55, x: 530, color: "#e91e63"},
    %{y: 55, x: 595, color: "#e91e63"},
    %{y: 80, x: 10, color: "#9c27b0"},
    %{y: 80, x: 75, color: "#9c27b0"},
    %{y: 80, x: 140, color: "#9c27b0"},
    %{y: 80, x: 205, color: "#9c27b0"},
    %{y: 80, x: 270, color: "#9c27b0"},
    %{y: 80, x: 335, color: "#9c27b0"},
    %{y: 80, x: 400, color: "#9c27b0"},
    %{y: 80, x: 465, color: "#9c27b0"},
    %{y: 80, x: 530, color: "#9c27b0"},
    %{y: 80, x: 595, color: "#9c27b0"},
    %{y: 105, x: 10, color: "#3f51b5"},
    %{y: 105, x: 75, color: "#3f51b5"},
    %{y: 105, x: 140, color: "#3f51b5"},
    %{y: 105, x: 205, color: "#3f51b5"},
    %{y: 105, x: 270, color: "#3f51b5"},
    %{y: 105, x: 335, color: "#3f51b5"},
    %{y: 105, x: 400, color: "#3f51b5"},
    %{y: 105, x: 465, color: "#3f51b5"},
    %{y: 105, x: 530, color: "#3f51b5"},
    %{y: 105, x: 595, color: "#3f51b5"},
    %{y: 130, x: 10, color: "#2196f3"},
    %{y: 130, x: 75, color: "#2196f3"},
    %{y: 130, x: 140, color: "#2196f3"},
    %{y: 130, x: 205, color: "#2196f3"},
    %{y: 130, x: 270, color: "#2196f3"},
    %{y: 130, x: 335, color: "#2196f3"},
    %{y: 130, x: 400, color: "#2196f3"},
    %{y: 130, x: 465, color: "#2196f3"},
    %{y: 130, x: 530, color: "#2196f3"},
    %{y: 130, x: 595, color: "#2196f3"}
  ],
  flash: %{},
  __changed__: %{
    blocks: true,
    game_state: true,
    paddle_x: true,
    ball_x: true,
    ball_y: true,
    ball_dx: true,
    ball_dy: true,
    score: true
  },
  game_state: :ready,
  paddle_x: 250.0,
  ball_x: 300.0,
  ball_y: 460,
  ball_dx: 5,
  ball_dy: -5,
  score: 0,
  live_action: nil
}
    (block_breaker 0.1.0) lib/block_breaker_web/live/game_live.ex:52: anonymous fn/2 in BlockBreakerWeb.GameLive.render/1
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/diff.ex:414: Phoenix.LiveView.Diff.traverse/7
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/diff.ex:555: anonymous fn/4 in Phoenix.LiveView.Diff.traverse_dynamic/7
    (elixir 1.18.4) lib/enum.ex:2546: Enum."-reduce/3-lists^foldl/2-0-"/3
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/diff.ex:412: Phoenix.LiveView.Diff.traverse/7
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/diff.ex:136: Phoenix.LiveView.Diff.render/3
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/static.ex:289: Phoenix.LiveView.Static.to_rendered_content_tag/4
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/static.ex:171: Phoenix.LiveView.Static.do_render/4
    (phoenix_live_view 1.0.17) lib/phoenix_live_view/controller.ex:39: Phoenix.LiveView.Controller.live_render/3
    (phoenix 1.7.21) lib/phoenix/router.ex:484: Phoenix.Router.__call__/5
    (block_breaker 0.1.0) lib/block_breaker_web/endpoint.ex:1: BlockBreakerWeb.Endpoint.plug_builder_call/2
    (block_breaker 0.1.0) deps/plug/lib/plug/debugger.ex:155: BlockBreakerWeb.Endpoint."call (overridable 3)"/2
    (block_breaker 0.1.0) lib/block_breaker_web/endpoint.ex:1: BlockBreakerWeb.Endpoint.call/2
    (phoenix 1.7.21) lib/phoenix/endpoint/sync_code_reload_plug.ex:22: Phoenix.Endpoint.SyncCodeReloadPlug.do_call/4
    (bandit 1.7.0) lib/bandit/pipeline.ex:131: Bandit.Pipeline.call_plug!/2
    (bandit 1.7.0) lib/bandit/pipeline.ex:42: Bandit.Pipeline.run/5
    (bandit 1.7.0) lib/bandit/http1/handler.ex:13: Bandit.HTTP1.Handler.handle_data/3
    (bandit 1.7.0) lib/bandit/delegating_handler.ex:18: Bandit.DelegatingHandler.handle_data/3
    (bandit 1.7.0) lib/bandit/delegating_handler.ex:8: Bandit.DelegatingHandler.handle_continue/2
    (stdlib 6.2.1) gen_server.erl:2335: :gen_server.try_handle_continue/3
```

</div></details>

このままではチャットできないので、 Ctrl + C で Phoenix を停止します

少し Phoenix LiveView の知識が足りていないようなので、教えてあげます

```
> lib/block_breaker_web/live/game_live.ex の mount 時に game_width や paddle_width などのキーを socket にアサインしていないため、エラーが発生しています
You're right, I missed assigning those important game constants to the socket. Let's fix the mount function in the game_live.ex file to include all the necessary
constants.


🛠️  Using tool: fs_write (trusted)
 ⋮
 ● Path: block_breaker/lib/block_breaker_web/live/game_live.ex

  16, 16:   def mount(_params, _session, socket) do
  17, 17:     if connected?(socket) do
  18, 18:       :timer.send_interval(@tick_rate, self(), :tick)
  19, 19:     end
  20, 20:
  21, 21:     {:ok,
  22, 22:      socket
  23, 23:      |> assign(
+     24:        # Game constants
+     25:        game_width: @game_width,
+     26:        game_height: @game_height,
+     27:        paddle_width: @paddle_width,
+     28:        paddle_height: @paddle_height,
+     29:        ball_radius: @ball_radius,
+     30:        block_width: @block_width,
+     31:        block_height: @block_height,
+     32:
+     33:        # Game state
  24, 34:        game_state: :ready, # :ready, :playing, :game_over
  25, 35:        paddle_x: (@game_width - @paddle_width) / 2,
  26, 36:        ball_x: @game_width / 2,
  27, 37:        ball_y: @game_height - @paddle_height - @ball_radius - 10,
  28, 38:        ball_dx: @ball_speed,
  29, 39:        ball_dy: -@ball_speed,
  30, 40:        blocks: initialize_blocks(),
  31, 41:        score: 0
  32, 42:      )}
  33, 43:   end

Updating: block_breaker/lib/block_breaker_web/live/game_live.ex

 ⋮
 ● Completed in 0.0s



🛠️  Using tool: fs_write (trusted)
 ⋮
 ● Path: block_breaker/lib/block_breaker_web/live/game_live.ex

  271, 271:   defp reset_game(socket) do
  272, 272:     socket
  273, 273:     |> assign(
  274, 274:       game_state: :ready,
  275, 275:       paddle_x: (@game_width - @paddle_width) / 2,
  276, 276:       ball_x: @game_width / 2,
  277, 277:       ball_y: @game_height - @paddle_height - @ball_radius - 10,
  278, 278:       ball_dx: @ball_speed,
  279, 279:       ball_dy: -@ball_speed,
  280, 280:       blocks: initialize_blocks(),
  281, 281:       score: 0
  282, 282:     )
  283, 283:   end

Updating: block_breaker/lib/block_breaker_web/live/game_live.ex

 ⋮
 ● Completed in 0.0s
I've updated the mount function in the game_live.ex file to include all the necessary game constants in the socket assigns. This will fix the error you were
encountering.

The updated mount function now assigns these additional values to the socket:
• game_width
• game_height
• paddle_width
• paddle_height
• ball_radius
• block_width
• block_height

These constants are needed in the template to properly render the game elements. Now when you reference these values in the template with @game_width,
@paddle_width, etc., they will be available from the socket assigns.

You should now be able to run the game without errors. To start the Phoenix server, you can run:

cd /Users/rwakabay/block_breaker
mix phx.server


Then visit http://localhost:4000/game in your browser to play the block breaker game.

The game features:
• A paddle you can control with mouse movement or arrow keys
• A bouncing ball that reflects off walls, blocks, and the paddle
• Multiple rows of colorful blocks to break
• Score tracking
• Game states (ready, playing, game over)
• Press Space to start the game or restart after game over
```

修正してくれました

起動してもらいましょう

```
> 起動してください



🛠️  Using tool: execute_bash (trusted)
 ⋮
 ● I will run the following shell command:
cd /Users/rwakabay/block_breaker && mix phx.server
 ⋮
 ↳ Purpose: Starting the Phoenix server

Compiling 1 file (.ex)
Generated block_breaker app
[info] Running BlockBreakerWeb.Endpoint with Bandit 1.7.0 at 127.0.0.1:4000 (http)
[info] Access BlockBreakerWeb.Endpoint at http://localhost:4000
[watch] build finished, watching for changes...

Rebuilding...

Done in 143ms.
```

<http://localhost:4000/game> でエラーが出なくなりました

![スクリーンショット 2025-06-13 23.48.54.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/1485835/c76751d3-cfd0-4ee4-a16d-5e0374062dfb.png)

早速、スペースキーを押してゲームをプレイしましょう

![brock_breaker.gif](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/1485835/d5c23971-3b20-4896-8f5d-e7acb5e37d7a.gif)

バッチリプレイできました！

## まとめ

Amazon Q CLI を使ってブロック崩しを実装できました

プロジェクトの作成からほぼ自動でやってくれるので、完成まで5分もかかっていません

少し失敗した部分もありましたが、指摘すればすぐ修正してくれました

Phoenix LiveView もしっかり理解してくれているのは頼もしいですね