commit 40260afeeb2b116eb9b6b84a3a93d1475f39e1c5
Author: timo <timopb@gmail.com>
Date:   Sat Aug 1 12:07:22 2026 +0200

    initial commit

diff --git a/README.md b/README.md
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+# Bottle Signal-Light UI
+
+A Bottle-based browser interface for the supplied FastAPI signal-light service.
+
+## Features
+
+- Mutually exclusive green, yellow, and red controls
+- Independent alert buzzer on/off control
+- Demo mode on/off control
+- All-off command
+- Automatic status polling every 1.5 seconds
+- Server-side proxy, so the browser does not need CORS access to FastAPI
+
+## Run
+
+```bash
+cd signal_light_ui
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+
+export SIGNAL_LIGHT_API_URL=http://127.0.0.1:8000
+python app.py
+```
+
+Open `http://<raspberry-pi-address>:8080`.
+
+## Configuration
+
+- `SIGNAL_LIGHT_API_URL` — FastAPI base URL, default `http://127.0.0.1:8000`
+- `SIGNAL_LIGHT_TIMEOUT` — upstream timeout in seconds, default `3`
+- `BOTTLE_HOST` — Bottle listen address, default `0.0.0.0`
+- `BOTTLE_PORT` — Bottle port, default `8080`
+- `BOTTLE_DEBUG` — set to `true` for debug/reloader
diff --git a/app.py b/app.py
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+++ b/app.py
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+import os
+from typing import Any, Dict, Tuple
+
+import requests
+from bottle import Bottle, HTTPError, TEMPLATE_PATH, request, response, run, static_file, template
+
+APP_DIR = os.path.dirname(os.path.abspath(__file__))
+TEMPLATE_PATH.insert(0, os.path.join(APP_DIR, "templates"))
+
+API_BASE_URL = os.getenv("SIGNAL_LIGHT_API_URL", "http://127.0.0.1:8000").rstrip("/")
+REQUEST_TIMEOUT_SECONDS = float(os.getenv("SIGNAL_LIGHT_TIMEOUT", "3"))
+
+app = Bottle()
+
+
+@app.hook("after_request")
+def add_security_headers() -> None:
+    response.set_header("X-Content-Type-Options", "nosniff")
+    response.set_header("X-Frame-Options", "DENY")
+    response.set_header("Referrer-Policy", "no-referrer")
+
+
+@app.get("/")
+def index():
+    return template("index", api_base_url=API_BASE_URL)
+
+@app.get("/favicon.ico")
+def serve_favicon():
+    return static_file("favicon.ico", root=os.path.join(APP_DIR, "static"))
+
+
+@app.get("/static/<filepath:path>")
+def serve_static(filepath: str):
+    return static_file(filepath, root=os.path.join(APP_DIR, "static"))
+
+
+def call_signal_api(method: str, path: str) -> Tuple[Dict[str, Any], int]:
+    """Call the signal-light service and normalize errors for the browser UI."""
+    url = f"{API_BASE_URL}{path}"
+
+    try:
+        upstream = requests.request(
+            method=method,
+            url=url,
+            timeout=REQUEST_TIMEOUT_SECONDS,
+        )
+    except requests.RequestException as exc:
+        return {
+            "ok": False,
+            "error": "Signal-light service is unavailable",
+            "detail": str(exc),
+            "upstream_url": url,
+        }, 502
+
+    try:
+        payload = upstream.json()
+    except ValueError:
+        payload = {
+            "ok": False,
+            "error": "Signal-light service returned a non-JSON response",
+            "detail": upstream.text[:500],
+        }
+
+    if not isinstance(payload, dict):
+        payload = {"data": payload}
+
+    payload.setdefault("ok", upstream.ok)
+    return payload, upstream.status_code
+
+
+def proxy(method: str, path: str):
+    payload, status_code = call_signal_api(method, path)
+    response.content_type = "application/json"
+    response.status = status_code
+    return payload
+
+
+@app.get("/ui-api/status")
+def ui_status():
+    return proxy("GET", "/status")
+
+
+@app.post("/ui-api/color/<color>")
+def ui_color(color: str):
+    if color not in {"green", "yellow", "red"}:
+        raise HTTPError(400, "Unsupported color")
+    return proxy("POST", f"/{color}")
+
+
+@app.post("/ui-api/alert/<state>")
+def ui_alert(state: str):
+    if state == "on":
+        return proxy("POST", "/alert")
+    if state == "off":
+        return proxy("POST", "/alert/off")
+    raise HTTPError(400, "Unsupported alert state")
+
+
+@app.post("/ui-api/demo/<state>")
+def ui_demo(state: str):
+    if state == "on":
+        return proxy("POST", "/demo")
+    if state == "off":
+        return proxy("POST", "/demo/off")
+    raise HTTPError(400, "Unsupported demo state")
+
+
+@app.post("/ui-api/off")
+def ui_off():
+    return proxy("POST", "/off")
+
+
+if __name__ == "__main__":
+    host = os.getenv("BOTTLE_HOST", "0.0.0.0")
+    port = int(os.getenv("BOTTLE_PORT", "8080"))
+    debug = os.getenv("BOTTLE_DEBUG", "false").lower() == "true"
+    run(app=app, host=host, port=port, debug=debug, reloader=debug)
diff --git a/requirements.txt b/requirements.txt
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+++ b/requirements.txt
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+bottle==0.13.2
+requests==2.32.3
diff --git a/static/app.css b/static/app.css
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+++ b/static/app.css
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+:root {
+  color-scheme: dark;
+  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+  background: #0b0f14;
+  color: #f4f7fb;
+}
+
+* { box-sizing: border-box; }
+
+body {
+  margin: 0;
+  min-height: 100vh;
+  background:
+    radial-gradient(circle at top left, rgba(70, 120, 255, .14), transparent 32rem),
+    #0b0f14;
+}
+
+button { font: inherit; }
+
+.shell {
+  width: min(980px, calc(100% - 32px));
+  margin: 0 auto;
+  padding: 48px 0 64px;
+}
+
+.header, .section-title, .control-card, .footer-actions {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 24px;
+}
+
+.header { margin-bottom: 24px; }
+
+h1, h2, p { margin-top: 0; }
+h1 { margin-bottom: 6px; font-size: clamp(2rem, 5vw, 3.8rem); }
+h2 { margin-bottom: 8px; }
+p { color: #a9b4c2; line-height: 1.55; }
+
+.eyebrow {
+  margin-bottom: 8px;
+  color: #7ea2ff;
+  font-size: .76rem;
+  font-weight: 800;
+  letter-spacing: .14em;
+  text-transform: uppercase;
+}
+
+.subtitle { margin-bottom: 0; }
+code { color: #d7e2ff; }
+
+.panel {
+  border: 1px solid #26313d;
+  border-radius: 24px;
+  background: rgba(20, 27, 35, .88);
+  box-shadow: 0 24px 80px rgba(0, 0, 0, .28);
+  padding: 28px;
+}
+
+.badge {
+  flex: 0 0 auto;
+  border-radius: 999px;
+  padding: 9px 14px;
+  font-size: .86rem;
+  font-weight: 800;
+}
+.badge--checking { background: #40391e; color: #f8d56b; }
+.badge--online { background: #163b2a; color: #72e2a8; }
+.badge--offline { background: #4a2025; color: #ff9da7; }
+
+.section-title strong {
+  border-radius: 999px;
+  background: #1a222d;
+  padding: 9px 14px;
+  text-transform: capitalize;
+}
+
+.traffic-light {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 20px;
+  margin-top: 28px;
+}
+
+.lamp {
+  border: 1px solid #303b47;
+  border-radius: 20px;
+  background: #111820;
+  color: #dfe6ef;
+  cursor: pointer;
+  padding: 24px 12px 18px;
+  transition: transform .16s ease, border-color .16s ease, background .16s ease;
+}
+.lamp:hover { transform: translateY(-2px); border-color: #627086; }
+.lamp:focus-visible, .toggle:focus-visible, .danger-button:focus-visible {
+  outline: 3px solid #7ea2ff;
+  outline-offset: 3px;
+}
+.lamp span {
+  display: block;
+  width: clamp(76px, 13vw, 130px);
+  aspect-ratio: 1;
+  margin: 0 auto 18px;
+  border-radius: 50%;
+  background: #242c35;
+  box-shadow: inset 0 0 30px rgba(0,0,0,.8);
+  opacity: .24;
+}
+.lamp.is-active { background: #17202a; border-color: #738197; }
+.lamp.is-active span { opacity: 1; }
+.lamp--red.is-active span { background: #ff3b4f; box-shadow: 0 0 42px rgba(255,59,79,.75); }
+.lamp--yellow.is-active span { background: #ffd23f; box-shadow: 0 0 42px rgba(255,210,63,.72); }
+.lamp--green.is-active span { background: #31df78; box-shadow: 0 0 42px rgba(49,223,120,.72); }
+.lamp:disabled, .toggle:disabled, .danger-button:disabled { cursor: wait; opacity: .62; }
+
+.controls-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 20px;
+  margin-top: 20px;
+}
+.control-card p { margin-bottom: 0; }
+
+.toggle {
+  min-width: 94px;
+  border: 0;
+  background: transparent;
+  color: #dbe4ee;
+  cursor: pointer;
+}
+.toggle__track {
+  display: block;
+  width: 66px;
+  height: 36px;
+  margin: 0 auto 8px;
+  border-radius: 999px;
+  background: #3a4552;
+  padding: 4px;
+  transition: background .18s ease;
+}
+.toggle__thumb {
+  display: block;
+  width: 28px;
+  height: 28px;
+  border-radius: 50%;
+  background: white;
+  transition: transform .18s ease;
+}
+.toggle[aria-checked="true"] .toggle__track { background: #2dca70; }
+.toggle[aria-checked="true"] .toggle__thumb { transform: translateX(30px); }
+
+.footer-actions { margin-top: 20px; }
+.danger-button {
+  border: 1px solid #a8404c;
+  border-radius: 14px;
+  background: #511e25;
+  color: #ffdfe2;
+  cursor: pointer;
+  font-weight: 800;
+  padding: 13px 18px;
+}
+.message { margin: 0; text-align: right; }
+.message.is-error { color: #ff9da7; }
+
+@media (max-width: 700px) {
+  .shell { padding-top: 24px; }
+  .header, .section-title, .control-card, .footer-actions { align-items: flex-start; }
+  .header, .control-card, .footer-actions { flex-direction: column; }
+  .controls-grid { grid-template-columns: 1fr; }
+  .traffic-light { gap: 10px; }
+  .panel { padding: 20px; border-radius: 18px; }
+  .lamp { padding-inline: 6px; }
+  .message { text-align: left; }
+}
diff --git a/static/app.js b/static/app.js
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--- /dev/null
+++ b/static/app.js
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+const state = {
+  activeColor: null,
+  alertActive: false,
+  demoActive: false,
+  busy: false,
+};
+
+const lamps = [...document.querySelectorAll(".lamp")];
+const alertToggle = document.getElementById("alertToggle");
+const demoToggle = document.getElementById("demoToggle");
+const allOffButton = document.getElementById("allOffButton");
+const activeColorText = document.getElementById("activeColorText");
+const alertToggleLabel = document.getElementById("alertToggleLabel");
+const demoToggleLabel = document.getElementById("demoToggleLabel");
+const connectionBadge = document.getElementById("connectionBadge");
+const message = document.getElementById("message");
+
+function setMessage(text, isError = false) {
+  message.textContent = text;
+  message.classList.toggle("is-error", isError);
+}
+
+function setConnection(online) {
+  connectionBadge.textContent = online ? "API online" : "API offline";
+  connectionBadge.className = `badge ${online ? "badge--online" : "badge--offline"}`;
+}
+
+function render() {
+  lamps.forEach((lamp) => {
+    const active = !state.demoActive && lamp.dataset.color === state.activeColor;
+    lamp.classList.toggle("is-active", active);
+    lamp.setAttribute("aria-pressed", String(active));
+    lamp.disabled = state.busy;
+  });
+
+  activeColorText.textContent = state.demoActive
+    ? "Demo running"
+    : (state.activeColor || "Off");
+
+  alertToggle.setAttribute("aria-checked", String(state.alertActive));
+  alertToggleLabel.textContent = state.alertActive ? "On" : "Off";
+  alertToggle.disabled = state.busy;
+
+  demoToggle.setAttribute("aria-checked", String(state.demoActive));
+  demoToggleLabel.textContent = state.demoActive ? "On" : "Off";
+  demoToggle.disabled = state.busy;
+
+  allOffButton.disabled = state.busy;
+}
+
+function applyApiState(payload) {
+  if (Object.hasOwn(payload, "active_color")) state.activeColor = payload.active_color;
+  if (Object.hasOwn(payload, "alert_active")) state.alertActive = Boolean(payload.alert_active);
+  if (Object.hasOwn(payload, "demo_active")) state.demoActive = Boolean(payload.demo_active);
+}
+
+async function apiCall(path, options = {}) {
+  const result = await fetch(path, {
+    method: options.method || "GET",
+    headers: { "Accept": "application/json" },
+  });
+  const payload = await result.json().catch(() => ({}));
+  if (!result.ok) {
+    throw new Error(payload.error || payload.detail || `Request failed (${result.status})`);
+  }
+  return payload;
+}
+
+async function runAction(action, successMessage) {
+  if (state.busy) return;
+  state.busy = true;
+  render();
+  setMessage("Sending command…");
+
+  try {
+    const payload = await action();
+    applyApiState(payload);
+    setConnection(true);
+    setMessage(successMessage);
+  } catch (error) {
+    setConnection(false);
+    setMessage(error.message, true);
+  } finally {
+    state.busy = false;
+    render();
+  }
+}
+
+lamps.forEach((lamp) => {
+  lamp.addEventListener("click", () => {
+    const color = lamp.dataset.color;
+    runAction(
+      () => apiCall(`/ui-api/color/${color}`, { method: "POST" }),
+      `${color[0].toUpperCase()}${color.slice(1)} light activated.`,
+    );
+  });
+});
+
+alertToggle.addEventListener("click", () => {
+  const nextState = state.alertActive ? "off" : "on";
+  runAction(
+    () => apiCall(`/ui-api/alert/${nextState}`, { method: "POST" }),
+    `Alert turned ${nextState}.`,
+  );
+});
+
+demoToggle.addEventListener("click", () => {
+  const nextState = state.demoActive ? "off" : "on";
+  runAction(
+    () => apiCall(`/ui-api/demo/${nextState}`, { method: "POST" }),
+    `Demo mode turned ${nextState}.`,
+  );
+});
+
+allOffButton.addEventListener("click", () => {
+  runAction(
+    () => apiCall("/ui-api/off", { method: "POST" }),
+    "All outputs turned off.",
+  );
+});
+
+async function refreshStatus({ quiet = false } = {}) {
+  if (state.busy) return;
+  try {
+    const payload = await apiCall("/ui-api/status");
+    applyApiState(payload);
+    setConnection(true);
+    if (!quiet) setMessage("Status synchronized.");
+    render();
+  } catch (error) {
+    setConnection(false);
+    if (!quiet) setMessage(error.message, true);
+  }
+}
+
+refreshStatus();
+setInterval(() => refreshStatus({ quiet: true }), 1500);
diff --git a/static/favicon.ico b/static/favicon.ico
new file mode 100644
index 0000000..3401479
Binary files /dev/null and b/static/favicon.ico differ
diff --git a/systemd/signal-light-ui.service b/systemd/signal-light-ui.service
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--- /dev/null
+++ b/systemd/signal-light-ui.service
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+# /etc/systemd/system/signal-light-ui.service
+
+[Unit]
+Description=Signal Light Bottle UI
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=pi
+WorkingDirectory=/opt/signal-light-ui
+
+# REST API endpoint
+Environment=SIGNAL_LIGHT_API_URL=http://127.0.0.1:8000
+
+ExecStart=/home/pi/signal_light_ui/.venv/bin/python app.py
+
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
diff --git a/templates/index.tpl b/templates/index.tpl
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+++ b/templates/index.tpl
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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Signal Light Control</title>
+  <link rel="stylesheet" href="/static/app.css">
+</head>
+<body>
+  <main class="shell">
+    <header class="header">
+      <div>
+        <p class="eyebrow">Raspberry Pi Control Panel</p>
+        <h1>Signal Light Controller</h1>
+        <p class="subtitle">REST API: <code>{{api_base_url}}</code></p>
+      </div>
+      <div id="connectionBadge" class="badge badge--checking">Checking…</div>
+    </header>
+
+    <section class="panel" aria-labelledby="light-heading">
+      <div class="section-title">
+        <div>
+          <h2 id="light-heading">Light color</h2>
+          <p>Only one color can be active at a time.</p>
+        </div>
+        <strong id="activeColorText">Off</strong>
+      </div>
+
+      <div class="traffic-light" aria-label="Current signal-light state">
+        <button class="lamp lamp--green" data-color="green" aria-label="Activate green light">
+          <span></span><b>Green</b>
+        </button>
+        <button class="lamp lamp--yellow" data-color="yellow" aria-label="Activate yellow light">
+          <span></span><b>Yellow</b>
+        </button>
+        <button class="lamp lamp--red" data-color="red" aria-label="Activate red light">
+          <span></span><b>Red</b>
+        </button>
+      </div>
+    </section>
+
+    <section class="controls-grid">
+      <article class="panel control-card">
+        <div>
+          <p class="eyebrow">Independent output</p>
+          <h2>Alert buzzer</h2>
+          <p>The buzzer blinks independently of the selected light.</p>
+        </div>
+        <button id="alertToggle" class="toggle" type="button" role="switch" aria-checked="false">
+          <span class="toggle__track"><span class="toggle__thumb"></span></span>
+          <span id="alertToggleLabel">Off</span>
+        </button>
+      </article>
+
+      <article class="panel control-card">
+        <div>
+          <p class="eyebrow">Automatic sequence</p>
+          <h2>Demo mode</h2>
+          <p>Cycles green → yellow → red → yellow.</p>
+        </div>
+        <button id="demoToggle" class="toggle" type="button" role="switch" aria-checked="false">
+          <span class="toggle__track"><span class="toggle__thumb"></span></span>
+          <span id="demoToggleLabel">Off</span>
+        </button>
+      </article>
+    </section>
+
+    <section class="panel footer-actions">
+      <button id="allOffButton" class="danger-button" type="button">Turn everything off</button>
+      <p id="message" class="message" role="status" aria-live="polite">Ready.</p>
+    </section>
+  </main>
+
+  <script src="/static/app.js" defer></script>
+</body>
+</html>