From efb56934eb9333fb19e515432c5f03f47e5aa3cf Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Tue, 9 Jun 2020 07:59:41 -0700
Subject: [PATCH] Add a button to advance from prompt voting to playing the
 actual game

Once a majority of the players have voted a new button appears (for
everyone) that when pressed tells the server that it's time to start
the game.

Then, when the client receives a "start" event from the server with
the prompt the server chose, the client replaces the entire interface
with a form for entering the responses to the prompt.

The submit button for that form is currently inert.
---
 empathy/empathy.css |   2 +-
 empathy/empathy.jsx | 105 ++++++++++++++++++++++++++++++++++++++++++++
 style.css           |   6 +++
 3 files changed, 112 insertions(+), 1 deletion(-)

diff --git a/empathy/empathy.css b/empathy/empathy.css
index d553597..ef88072 100644
--- a/empathy/empathy.css
+++ b/empathy/empathy.css
@@ -6,7 +6,7 @@
     border-radius: 25px;
     font-size: 200%;
     padding: 1em;
-    margin-top: 0.25em;
+    margin-bottom: 0.25em;
 }
 
 .vote-choices {
diff --git a/empathy/empathy.jsx b/empathy/empathy.jsx
index 110b330..0771bbe 100644
--- a/empathy/empathy.jsx
+++ b/empathy/empathy.jsx
@@ -58,6 +58,8 @@ events.addEventListener("game-state", event => {
   for (let prompt of state.prompts) {
     window.game.add_or_update_prompt(prompt);
   }
+
+  window.game.set_active_prompt(state.active_prompt);
 });
 
 events.addEventListener("prompt", event => {
@@ -66,6 +68,12 @@ events.addEventListener("prompt", event => {
   window.game.add_or_update_prompt(prompt);
 });
 
+events.addEventListener("start", event => {
+  const prompt = JSON.parse(event.data);
+
+  window.game.set_active_prompt(prompt);
+});
+
 /*********************************************************
  * Game and supporting classes                           *
  *********************************************************/
@@ -249,6 +257,86 @@ const PromptOptions = React.memo(props => {
   );
 });
 
+const LetsPlay = React.memo(props => {
+
+  function handle_click(prompt_id) {
+    fetch_post_json
+  }
+
+  const quorum = Math.round((props.num_players + 1) / 2);
+  const max_votes = props.prompts.reduce(
+    (max_so_far, v) => Math.max(max_so_far, v.votes.length), 0);
+
+  if (max_votes < quorum)
+    return null;
+
+  const candidates = props.prompts.filter(p => p.votes.length >= quorum);
+  const index = Math.floor(Math.random() * candidates.length);
+  const winner = candidates[index];
+
+  return (
+    <div className="lets-play">
+      <h2>Let's Play</h2>
+      <p>
+        That should be enough voting. If you're not waiting for any
+        other players to join, then let's start.
+      </p>
+      <button
+        className="lets-play"
+        onClick={() => fetch_post_json(`start/${winner.id}`) }
+      >
+        Start Game
+      </button>
+    </div>
+  );
+});
+
+const ActivePrompt = React.memo(props => {
+
+  function handle_submit(event) {
+
+    /* Prevent the default page-changing form-submission behavior. */
+    event.preventDefault();
+  }
+
+  return (
+    <div className="active-prompt">
+      <h2>The Game of Empathy</h2>
+      <p>
+        Remember, you're trying to match your answers with
+        what the other players submit.
+        Give {props.prompt.items} responses for the following prompt:
+      </p>
+      <h2>{props.prompt.prompt}</h2>
+      <form onSubmit={handle_submit}>
+        {Array(props.prompt.items).fill(null).map((whocares,i) => {
+          return (
+            <div
+              key={i}
+              className="form-field large">
+              <input
+                type="text"
+                name={`response_${i}`}
+                required
+                autoComplete="off"
+              />
+            </div>
+          );
+        })}
+
+        <div
+          key="submit-button"
+          className="form-field large">
+          <button type="submit">
+            Send
+          </button>
+        </div>
+
+      </form>
+    </div>
+  );
+});
+
 class Game extends React.PureComponent {
   constructor(props) {
     super(props);
@@ -298,9 +386,21 @@ class Game extends React.PureComponent {
     });
   }
 
+  set_active_prompt(prompt) {
+    this.setState({
+      active_prompt: prompt
+    });
+  }
+
   render() {
     const state = this.state;
 
+    if (state.active_prompt) {
+      return <ActivePrompt
+               prompt={state.active_prompt}
+             />;
+    }
+
     return [
       <GameInfo
         key="game-info"
@@ -320,6 +420,11 @@ class Game extends React.PureComponent {
       <PromptOptions
         key="prompts"
         prompts={state.prompts}
+      />,
+      <LetsPlay
+        key="lets-play"
+        num_players={1+state.other_players.length}
+        prompts={state.prompts}
       />
     ];
   }
diff --git a/style.css b/style.css
index b4d5b1b..c8d6c86 100644
--- a/style.css
+++ b/style.css
@@ -51,6 +51,7 @@ body {
 h1,h2 {
     color: var(--text-fg-color);
     font-weight: bold;
+    margin-top: 0.5em;
 }
 
 h1 {
@@ -215,6 +216,11 @@ form {
     grid-column-gap: 1em;
 }
 
+.form-field {
+    margin-top: 0.25em;
+    margin-bottom: 0.25em;
+}
+
 .form-field.small.left,.form-field.medium.left {
     grid-column-start: 1;
 }
-- 
2.43.0