About to push

app/static/styles.css

@@ -151,6 +151,21 @@ h2 {
   padding: 16px;
 }
 
+.metric-link {
+  color: inherit;
+  text-decoration: none;
+  transition: border-color 0.15s ease, transform 0.15s ease;
+}
+
+.metric-link:hover {
+  border-color: var(--brand);
+  transform: translateY(-1px);
+}
+
+.device-summary {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+}
+
 .card-heading {
   display: flex;
   align-items: start;
@@ -243,6 +258,10 @@ h2 {
   margin-bottom: 18px;
 }
 
+.report-form.compact {
+  grid-template-columns: minmax(180px, 240px) auto;
+}
+
 .report-form label {
   display: grid;
   gap: 6px;
@@ -293,6 +312,10 @@ th {
   .report-form {
     grid-template-columns: repeat(2, minmax(0, 1fr));
   }
+
+  .device-summary {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
 }
 
 @media (max-width: 620px) {
@@ -313,7 +336,9 @@ th {
   }
 
   .cards,
-  .report-form {
+  .report-form,
+  .report-form.compact,
+  .device-summary {
     grid-template-columns: 1fr;
   }
 

app/templates/dashboard.html

@@ -17,7 +17,7 @@
       {% for device in devices %}
         {% set reading = latest.get(device.id) %}
         {% set stat = stats.get(device.id) %}
-        <article class="metric-card">
+        <a class="metric-card metric-link" href="/devices/{{ device.id }}">
           <div class="card-heading">
             <h2>{{ device.name }}</h2>
             <span>{{ device.device_type }}</span>
@@ -44,7 +44,7 @@
           {% else %}
             <p class="empty">Waiting for the first reading.</p>
           {% endif %}
-        </article>
+        </a>
       {% endfor %}
     </section>
 

app/templates/device.html

@@ -0,0 +1,92 @@
+{% extends "base.html" %}
+
+{% block title %}{{ device.name }} - SwitchBot Temps{% endblock %}
+
+{% block content %}
+  <section class="hero">
+    <div>
+      <p class="eyebrow">Device readings</p>
+      <h1>{{ device.name }}</h1>
+      <p class="muted">{{ device.device_type }}. Local timezone: {{ timezone }}.</p>
+    </div>
+    <a class="button secondary" href="/">Back to dashboard</a>
+  </section>
+
+  <form class="report-form compact" method="get" action="/devices/{{ device.id }}">
+    <label>
+      Day
+      <input type="date" name="date" value="{{ date }}">
+    </label>
+    <button class="button" type="submit">View day</button>
+  </form>
+
+  <section class="cards device-summary">
+    <article class="metric-card">
+      <h2>Samples</h2>
+      <div class="reading-row">
+        <strong>{{ readings|length }}</strong>
+      </div>
+    </article>
+    <article class="metric-card">
+      <h2>Low temp</h2>
+      <div class="reading-row">
+        <strong>{{ "%.1f"|format(stats.low) if stats else "n/a" }}&deg;C</strong>
+      </div>
+    </article>
+    <article class="metric-card">
+      <h2>High temp</h2>
+      <div class="reading-row">
+        <strong>{{ "%.1f"|format(stats.high) if stats else "n/a" }}&deg;C</strong>
+      </div>
+    </article>
+  </section>
+
+  <section class="panel">
+    <div class="panel-heading">
+      <div>
+        <h2>Day graph</h2>
+        <p class="muted">Temperature readings for {{ date }}.</p>
+      </div>
+    </div>
+    <div class="chart-wrap">
+      <canvas id="temperatureChart" height="360"></canvas>
+    </div>
+    <script id="chart-data" type="application/json">{{ chart_json|safe }}</script>
+    <script src="{{ url_for('static', filename='chart.js') }}"></script>
+  </section>
+
+  <section class="panel">
+    <div class="panel-heading">
+      <div>
+        <h2>Readings</h2>
+        <p class="muted">Timestamped readings for this device and day.</p>
+      </div>
+    </div>
+    <div class="table-wrap">
+      <table>
+        <thead>
+          <tr>
+            <th>Timestamp</th>
+            <th>Temperature</th>
+            <th>Humidity</th>
+            <th>Battery</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for reading in local_readings %}
+            <tr>
+              <td>{{ reading.timestamp }}</td>
+              <td>{{ "%.1f"|format(reading.temperature) if reading.temperature is not none else "n/a" }}&deg;C</td>
+              <td>{{ reading.humidity if reading.humidity is not none else "n/a" }}%</td>
+              <td>{{ reading.battery if reading.battery is not none else "n/a" }}%</td>
+            </tr>
+          {% else %}
+            <tr>
+              <td colspan="4" class="empty">No readings found for this day.</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </div>
+  </section>
+{% endblock %}

app/templates/not_found.html

@@ -0,0 +1,11 @@
+{% extends "base.html" %}
+
+{% block title %}Not found - SwitchBot Temps{% endblock %}
+
+{% block content %}
+  <section class="empty-state">
+    <h1>Device not found</h1>
+    <p class="muted">That device is not available as a temperature sensor.</p>
+    <a class="button" href="/">Back to dashboard</a>
+  </section>
+{% endblock %}

app/web.py

@@ -49,6 +49,30 @@ def create_app() -> Flask:
             collect_interval_seconds=config.collect_interval_seconds,
         )
 
+    @app.get("/devices/<device_id>")
+    def device_detail(device_id: str) -> str:
+        tz = ZoneInfo(config.app_timezone)
+        selected_date_text = request.args.get("date") or datetime.now(tz).date().isoformat()
+        selected_date = date.fromisoformat(selected_date_text)
+        start_utc, end_utc = local_date_range_to_utc(selected_date, selected_date, tz)
+
+        with SessionLocal() as session:
+            device = session.get(Device, device_id)
+            if device is None or device.device_type not in SENSOR_DEVICE_TYPES:
+                return render_template("not_found.html"), 404
+            readings = load_device_readings(session, device_id, start_utc, end_utc)
+
+        return render_template(
+            "device.html",
+            device=device,
+            date=selected_date_text,
+            readings=readings,
+            stats=stats_by_device(readings).get(device_id),
+            chart_json=json.dumps(chart_payload(readings, tz)),
+            timezone=config.app_timezone,
+            local_readings=readings_for_display(readings, tz),
+        )
+
     @app.get("/reports")
     def reports() -> str:
         tz = ZoneInfo(config.app_timezone)
@@ -147,6 +171,25 @@ def load_readings(session: Session, start_utc: datetime, end_utc: datetime) -> l
     return list(session.scalars(stmt))
 
 
+def load_device_readings(
+    session: Session,
+    device_id: str,
+    start_utc: datetime,
+    end_utc: datetime,
+) -> list[Reading]:
+    stmt = (
+        select(Reading)
+        .options(joinedload(Reading.device))
+        .where(
+            Reading.device_id == device_id,
+            Reading.recorded_at >= start_utc,
+            Reading.recorded_at < end_utc,
+        )
+        .order_by(Reading.recorded_at)
+    )
+    return list(session.scalars(stmt))
+
+
 def latest_by_device(session: Session) -> dict[str, Reading]:
     subquery = (
         select(Reading.device_id, func.max(Reading.recorded_at).label("latest_at"))
@@ -204,6 +247,21 @@ def chart_payload(readings: list[Reading], tz: ZoneInfo) -> list[dict[str, objec
     return list(series.values())
 
 
+def readings_for_display(readings: list[Reading], tz: ZoneInfo) -> list[dict[str, object]]:
+    rows = []
+    for reading in readings:
+        local_time = reading.recorded_at.replace(tzinfo=timezone.utc).astimezone(tz)
+        rows.append(
+            {
+                "timestamp": local_time.strftime("%Y-%m-%d %H:%M"),
+                "temperature": reading.temperature,
+                "humidity": reading.humidity,
+                "battery": reading.battery,
+            }
+        )
+    return rows
+
+
 def report_rows(
     session: Session,
     start_utc: datetime,