commit b078b850f854b845ae92ac18cfe8d90a9ddf882f
Author: truetype <max.mauri@gmail.com>
Date:   Tue Jul 14 20:38:18 2026 +0200

    Initial commit: ShellyDash dashboard fotovoltaico
    
    Flask app con gauge Chart.js custom, polling Shelly Cloud API v2,
    storico SQLite, due widget gauge (produzione/consumo) con scala graduata.

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..58919c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+venv/
+*.pyc
+__pycache__/
+.env
+data/*.db
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..e0aa314
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,86 @@
+# shellydash — AGENTS.md
+
+## Quick start
+```bash
+cd /home/codex/shellydash
+venv/bin/python3 app.py          # avvia su 0.0.0.0:5050
+```
+
+Il `.env` carica automaticamente via `load_dotenv()` in `app.py` e `poller.py`.
+
+## Stack
+- Python 3.14, Flask 3.1, SQLite, Chart.js 4.4 (CDN)
+- Venv: `venv/` (già creato)
+- Dipendenze: `flask`, `requests`, `python-dotenv`
+
+## Architettura
+
+| File | Ruolo |
+|---|---|
+| `app.py` | Entrypoint Flask, 6 route API + serve `templates/index.html` |
+| `shelly_client.py` | Chiamate HTTP POST a Shelly Cloud Control API v2 |
+| `database.py` | SQLite with WAL mode, schema `readings`, energy aggregations |
+| `poller.py` | Thread background: poll Shelly ogni 15s → insert DB + cache `latest_parsed` |
+| `templates/index.html` | Dashboard HTML + JS (Chart.js gauge custom plugin, storico, energia) |
+
+### Flusso dati
+```
+Shelly Cloud ← poller.poll_once() (ogni 15s) → database.py (SQLite)
+                                               → app._latest_parsed (dict, in-memory)
+                                               → /api/status (da cache, non DB)
+                                               → /api/history (da DB)
+```
+
+### API endpoints
+| Route | Descrizione | Fonte dati |
+|---|---|---|
+| `GET /api/status` | Letture live (produzione, consumo, delta, V, A, PF, temp) | cache poller |
+| `GET /api/history?hours=24` | Array timestamp → produzione/consumo | DB |
+| `GET /api/energy/today` | Energia odierna (prodotta, consumata, immessa) | DB (differenza energy counter) |
+| `GET /api/energy/monthly` | Breakdown giornaliero mese corrente | DB |
+| `GET /api/delta` | Surplus/deficit booleano per automazioni | cache poller |
+
+## Shelly EM — assetto canali
+- **Un solo device** con ID `d885ac0b5860` (Shelly EM Gen3, modello S3EM-002CXCEU)
+- `em1:0` → produzione pannelli (pinza sull'uscita inverter)
+- `em1:1` → consumo casa/rete (pinza sull'ingresso inverter, valori negativi = prelievo)
+- `consumption_w` nelle API = `abs(ch1)` quando negativo
+- Auth via `auth_key` (parametro query `?auth_key=...`), **non** email/password
+- Endpoint: `https://shelly-255-eu.shelly.cloud/v2/devices/api/{action}`
+
+## Convenzioni codice
+- `from __future__ import annotations` in ogni .py
+- Type hints ovunque
+- Logging via `logging.getLogger("shellydash.*")`
+- `.env` non tracciato in git (`.gitignore` lo esclude)
+
+## Frontend (index.html)
+- **Non** usa framework JS — vanilla JS con Chart.js via CDN
+- Gauge semi-circolare con lancetta: plugin Chart.js custom (`gaugePlugin`), **non** libreria esterna
+- Due widget gauge: `#gaugeProd` (produzione, max 6000W, verde) e `#gaugeCons` (consumo, max 3000W, ambra)
+- Scala graduata con tacche maggiori (1000W) e minori (500W) disegnate su canvas
+- Auto-refresh ogni 15s via `setInterval(refreshAll, 15000)`
+- UI in italiano, tema scuro (#0f172a sfondo)
+
+## Comandi utili
+```bash
+# Avviare
+venv/bin/python3 app.py
+
+# Test API singola
+curl -s http://localhost:5050/api/status | python3 -m json.tool
+
+# Verificare import (senza avviare server)
+venv/bin/python3 -c "from app import app; print('ok')"
+
+# Installare nuove dipendenze
+venv/bin/pip install <package>
+# E aggiungere a requirements.txt
+```
+
+## Note operative
+- Il poller parte in un thread **dopo** il primo `poller.poll_once()`. Serve almeno un poll riuscito prima che `/api/status` risponda.
+- Il DB è in `data/shellydash.db` — escluso da git.
+- `POLL_INTERVAL` in `.env` (default 15s).
+- Non ci sono test (repo in fase iniziale).
+- Il device Shelly deve essere online e connesso al cloud.
diff --git a/app.py b/app.py
new file mode 100644
index 0000000..69552f7
--- /dev/null
+++ b/app.py
@@ -0,0 +1,151 @@
+"""ShellyDash — Flask application with REST API + dashboard."""
+
+from __future__ import annotations
+
+import logging
+import os
+from pathlib import Path
+
+from dotenv import load_dotenv
+from flask import Flask, jsonify, render_template, request, send_from_directory
+
+from database import Database
+from poller import ShellyPoller
+from shelly_client import ShellyClient
+
+load_dotenv()
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
+)
+
+SERVER = os.getenv("SHELLY_SERVER", "")
+AUTH_KEY = os.getenv("SHELLY_AUTH_KEY", "")
+DEVICE_ID = os.getenv("SHELLY_DEVICE_ID", "")
+FLASK_HOST = os.getenv("FLASK_HOST", "0.0.0.0")
+FLASK_PORT = int(os.getenv("FLASK_PORT", "5050"))
+
+# ── Globals ────────────────────────────────────────────────────────
+db = Database()
+client = ShellyClient(SERVER, AUTH_KEY, DEVICE_ID)
+poller = ShellyPoller(client, db)
+
+app = Flask(__name__, static_folder="static", template_folder="templates")
+
+
+# ── Frontend routes ────────────────────────────────────────────────
+@app.route("/")
+def index():
+    return render_template("index.html")
+
+
+@app.route("/static/<path:filename>")
+def static_files(filename):
+    return send_from_directory(Path(app.root_path) / "static", filename)
+
+
+# ── API routes ─────────────────────────────────────────────────────
+@app.route("/api/status")
+def api_status():
+    """Current real-time readings."""
+    live = poller.latest_parsed
+    if not live:
+        return jsonify({"ok": False, "error": "No data yet"}), 503
+    ch0_power = live.get("ch0_act_power") or 0
+    ch1_power = live.get("ch1_act_power") or 0
+    consumption = abs(ch1_power) if ch1_power < 0 else ch1_power
+    delta = ch0_power - consumption
+    return jsonify({
+        "ok": True,
+        "ts": live.get("unixtime"),
+        "production_w": round(ch0_power, 1),
+        "consumption_w": round(consumption, 1),
+        "delta_w": round(delta, 1),
+        "voltage": live.get("ch0_voltage"),
+        "ch0_current": live.get("ch0_current"),
+        "ch1_current": live.get("ch1_current"),
+        "ch0_pf": live.get("ch0_pf"),
+        "ch1_pf": live.get("ch1_pf"),
+        "temperature": live.get("temperature"),
+        "wifi_rssi": live.get("wifi_rssi"),
+        "online": live.get("online"),
+    })
+
+
+@app.route("/api/history")
+def api_history():
+    """Historical data.  Query param: hours (default 24)."""
+    hours = int(request.args.get("hours", 24))
+    rows = db.get_history(hours)
+    return jsonify({
+        "ok": True,
+        "hours": hours,
+        "data": [
+            {
+                "ts": r["ts"],
+                "production_w": r["ch0_act_power"],
+                "consumption_w": abs(r["ch1_act_power"]) if (r["ch1_act_power"] or 0) < 0 else r["ch1_act_power"],
+                "voltage": r["ch0_voltage"],
+                "ch0_current": r["ch0_current"],
+                "ch1_current": r["ch1_current"],
+            }
+            for r in rows
+        ],
+    })
+
+
+@app.route("/api/energy/today")
+def api_energy_today():
+    """Today's energy totals."""
+    today = db.get_energy_today()
+    return jsonify({
+        "ok": True,
+        "production_kwh": round((today.get("ch0_energy") or 0) / 1000, 3),
+        "production_returned_kwh": round((today.get("ch0_ret") or 0) / 1000, 3),
+        "consumption_kwh": round((today.get("ch1_energy") or 0) / 1000, 3),
+        "grid_returned_kwh": round((today.get("ch1_ret") or 0) / 1000, 3),
+    })
+
+
+@app.route("/api/energy/monthly")
+def api_energy_monthly():
+    """Monthly energy breakdown by day."""
+    days = db.get_monthly_energy()
+    return jsonify({
+        "ok": True,
+        "data": [
+            {
+                "day": d["day"],
+                "production_kwh": round((d["ch0_prod"] or 0) / 1000, 2),
+                "consumption_kwh": round((d["ch1_cons"] or 0) / 1000, 2),
+            }
+            for d in days
+        ],
+    })
+
+
+@app.route("/api/delta")
+def api_delta():
+    """Surplus / deficit value for automations."""
+    live = poller.latest_parsed
+    if not live:
+        return jsonify({"ok": False, "error": "No data"}), 503
+    prod = live.get("ch0_act_power") or 0
+    ch1 = live.get("ch1_act_power") or 0
+    cons = abs(ch1) if ch1 < 0 else ch1
+    delta = prod - cons
+    return jsonify({
+        "ok": True,
+        "delta_w": round(delta, 1),
+        "production_w": round(prod, 1),
+        "consumption_w": round(cons, 1),
+        "surplus": delta > 0,
+    })
+
+
+# ── Main ───────────────────────────────────────────────────────────
+if __name__ == "__main__":
+    poller.poll_once()
+    poller.start()
+    app.run(host=FLASK_HOST, port=FLASK_PORT, debug=False)
diff --git a/database.py b/database.py
new file mode 100644
index 0000000..3a8c3af
--- /dev/null
+++ b/database.py
@@ -0,0 +1,151 @@
+"""SQLite database manager for ShellyDash."""
+
+from __future__ import annotations
+
+import sqlite3
+import time
+from datetime import datetime, timezone
+from pathlib import Path
+
+
+DB_PATH = Path(__file__).parent / "data" / "shellydash.db"
+
+
+class Database:
+    """Manage readings storage and queries."""
+
+    def __init__(self, db_path: str | Path = DB_PATH):
+        self.db_path = Path(db_path)
+        self.db_path.parent.mkdir(parents=True, exist_ok=True)
+        self._init_schema()
+
+    def _connect(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(str(self.db_path))
+        conn.row_factory = sqlite3.Row
+        conn.execute("PRAGMA journal_mode=WAL")
+        return conn
+
+    def _init_schema(self):
+        with self._connect() as conn:
+            conn.executescript("""
+                CREATE TABLE IF NOT EXISTS readings (
+                    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+                    ts          INTEGER NOT NULL,       -- unix timestamp
+                    ch0_act_power       REAL,
+                    ch0_aprt_power      REAL,
+                    ch0_current         REAL,
+                    ch0_voltage         REAL,
+                    ch0_pf              REAL,
+                    ch0_total_act_energy  REAL,
+                    ch0_total_ret_energy   REAL,
+                    ch1_act_power       REAL,
+                    ch1_aprt_power      REAL,
+                    ch1_current         REAL,
+                    ch1_voltage         REAL,
+                    ch1_pf              REAL,
+                    ch1_total_act_energy  REAL,
+                    ch1_total_ret_energy   REAL,
+                    switch_output       INTEGER,
+                    temperature         REAL,
+                    wifi_rssi           INTEGER,
+                    online              INTEGER,
+                    uptime              INTEGER
+                );
+                CREATE INDEX IF NOT EXISTS idx_readings_ts ON readings(ts);
+            """)
+
+    def insert_reading(self, r: dict) -> int | None:
+        ts = int(r.get("unixtime") or time.time())
+        with self._connect() as conn:
+            cur = conn.execute(
+                """INSERT INTO readings (
+                    ts, ch0_act_power, ch0_aprt_power, ch0_current, ch0_voltage,
+                    ch0_pf, ch0_total_act_energy, ch0_total_ret_energy,
+                    ch1_act_power, ch1_aprt_power, ch1_current, ch1_voltage,
+                    ch1_pf, ch1_total_act_energy, ch1_total_ret_energy,
+                    switch_output, temperature, wifi_rssi, online, uptime
+                ) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)""",
+                (
+                    ts,
+                    r.get("ch0_act_power"),
+                    r.get("ch0_aprt_power"),
+                    r.get("ch0_current"),
+                    r.get("ch0_voltage"),
+                    r.get("ch0_pf"),
+                    r.get("ch0_total_act_energy"),
+                    r.get("ch0_total_ret_energy"),
+                    r.get("ch1_act_power"),
+                    r.get("ch1_aprt_power"),
+                    r.get("ch1_current"),
+                    r.get("ch1_voltage"),
+                    r.get("ch1_pf"),
+                    r.get("ch1_total_act_energy"),
+                    r.get("ch1_total_ret_energy"),
+                    1 if r.get("switch_output") else 0,
+                    r.get("temperature"),
+                    r.get("wifi_rssi"),
+                    1 if r.get("online") else 0,
+                    r.get("uptime"),
+                ),
+            )
+            return cur.lastrowid
+
+    def get_latest(self) -> dict | None:
+        """Return the most recent reading."""
+        with self._connect() as conn:
+            row = conn.execute(
+                "SELECT * FROM readings ORDER BY ts DESC LIMIT 1"
+            ).fetchone()
+        return dict(row) if row else None
+
+    def get_history(self, hours: int = 24) -> list[dict]:
+        """Return readings for the last N hours, sampled ~ every 60s."""
+        since = int(time.time()) - hours * 3600
+        with self._connect() as conn:
+            rows = conn.execute(
+                """SELECT * FROM readings
+                   WHERE ts >= ?
+                   ORDER BY ts ASC""",
+                (since,),
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    def get_energy_today(self) -> dict:
+        """Return total energy produced/consumed today."""
+        t = datetime.now(timezone.utc)
+        start_of_day = int(t.replace(hour=0, minute=0, second=0, microsecond=0).timestamp())
+        with self._connect() as conn:
+            row = conn.execute(
+                """SELECT
+                    MAX(ch0_total_act_energy) - MIN(ch0_total_act_energy) AS ch0_energy,
+                    MAX(ch0_total_ret_energy) - MIN(ch0_total_ret_energy) AS ch0_ret,
+                    MAX(ch1_total_act_energy) - MIN(ch1_total_act_energy) AS ch1_energy,
+                    MAX(ch1_total_ret_energy) - MIN(ch1_total_ret_energy) AS ch1_ret
+                   FROM readings WHERE ts >= ?""",
+                (start_of_day,),
+            ).fetchone()
+        return dict(row) if row else {}
+
+    def get_monthly_energy(self) -> list[dict]:
+        """Return daily energy sums for the current month."""
+        t = datetime.now(timezone.utc)
+        start_of_month = int(t.replace(day=1, hour=0, minute=0, second=0, microsecond=0).timestamp())
+        with self._connect() as conn:
+            rows = conn.execute(
+                """SELECT
+                    date(ts, 'unixepoch') AS day,
+                    MAX(ch0_total_act_energy) - MIN(ch0_total_act_energy) AS ch0_prod,
+                    MAX(ch1_total_act_energy) - MIN(ch1_total_act_energy) AS ch1_cons
+                   FROM readings
+                   WHERE ts >= ?
+                   GROUP BY day
+                   ORDER BY day ASC""",
+                (start_of_month,),
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    def cleanup_old(self, days: int = 365):
+        """Delete readings older than N days."""
+        cutoff = int(time.time()) - days * 86400
+        with self._connect() as conn:
+            conn.execute("DELETE FROM readings WHERE ts < ?", (cutoff,))
diff --git a/poller.py b/poller.py
new file mode 100644
index 0000000..b215426
--- /dev/null
+++ b/poller.py
@@ -0,0 +1,78 @@
+"""Background poller that fetches Shelly data periodically."""
+
+from __future__ import annotations
+
+import logging
+import os
+import threading
+import time
+from pathlib import Path
+
+from dotenv import load_dotenv
+
+from database import Database
+from shelly_client import ShellyClient, ShellyError
+
+load_dotenv()
+
+logger = logging.getLogger("shellydash.poller")
+
+POLL_INTERVAL = int(os.getenv("POLL_INTERVAL", "15"))
+
+
+class ShellyPoller:
+    """Periodically fetches device status and stores readings."""
+
+    def __init__(
+        self,
+        client: ShellyClient,
+        db: Database,
+        interval: int = POLL_INTERVAL,
+    ):
+        self.client = client
+        self.db = db
+        self.interval = interval
+        self._running = False
+        self._thread: threading.Thread | None = None
+        self._latest_raw: dict = {}
+        self._latest_parsed: dict = {}
+
+    @property
+    def latest_parsed(self) -> dict:
+        return self._latest_parsed
+
+    @property
+    def latest_raw(self) -> dict:
+        return self._latest_raw
+
+    def start(self):
+        self._running = True
+        self._thread = threading.Thread(target=self._loop, daemon=True)
+        self._thread.start()
+        logger.info("Poller started (interval=%ds)", self.interval)
+
+    def stop(self):
+        self._running = False
+
+    def poll_once(self) -> bool:
+        try:
+            status = self.client.get_device_status()
+            if not status:
+                logger.warning("Empty status from Shelly API")
+                return False
+            self._latest_raw = status
+            parsed = self.client.parse_readings(status)
+            self._latest_parsed = parsed
+            self.db.insert_reading(parsed)
+            return True
+        except ShellyError as exc:
+            logger.error("Poll error: %s", exc)
+            return False
+        except Exception as exc:
+            logger.exception("Unexpected poll error: %s", exc)
+            return False
+
+    def _loop(self):
+        while self._running:
+            self.poll_once()
+            time.sleep(self.interval)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..a0d407c
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+flask>=3.0
+requests>=2.31
diff --git a/shelly.PNG b/shelly.PNG
new file mode 100644
index 0000000..c600b7f
Binary files /dev/null and b/shelly.PNG differ
diff --git a/shelly_client.py b/shelly_client.py
new file mode 100644
index 0000000..7eaa053
--- /dev/null
+++ b/shelly_client.py
@@ -0,0 +1,104 @@
+"""Shelly Cloud API client."""
+
+from __future__ import annotations
+
+import time
+from typing import Any
+
+import requests
+
+
+class ShellyError(Exception):
+    """Shelly API error."""
+
+
+class ShellyClient:
+    """Client for Shelly Cloud Control API v2."""
+
+    def __init__(
+        self,
+        server: str,
+        auth_key: str,
+        device_id: str,
+        timeout: float = 10,
+    ):
+        self.server = server.rstrip("/")
+        self.auth_key = auth_key
+        self.device_id = device_id
+        self.timeout = timeout
+        self._session = requests.Session()
+
+    def _post(self, path: str, body: dict) -> Any:
+        """POST JSON to API endpoint with auth_key as query param."""
+        url = f"{self.server}/v2/devices/api/{path}"
+        params = {"auth_key": self.auth_key}
+        try:
+            resp = self._session.post(
+                url, json=body, params=params, timeout=self.timeout
+            )
+        except requests.exceptions.ConnectionError as exc:
+            raise ShellyError(f"Connection error: {exc}") from exc
+        except requests.exceptions.Timeout as exc:
+            raise ShellyError(f"Timeout: {exc}") from exc
+
+        if resp.status_code == 429:
+            time.sleep(2)
+            return self._post(path, body)
+
+        if resp.status_code == 401:
+            raise ShellyError("Authentication failed — check auth_key")
+
+        if not resp.ok:
+            raise ShellyError(f"HTTP {resp.status_code}: {resp.text[:200]}")
+
+        if not resp.content:
+            return {}
+
+        return resp.json()
+
+    def get_device_status(self) -> dict:
+        """Fetch full status of the device."""
+        data = self._post("get", {
+            "ids": [self.device_id],
+            "select": ["status"],
+        })
+        if isinstance(data, list) and len(data) > 0:
+            return data[0]
+        return {}
+
+    def parse_readings(self, status: dict) -> dict:
+        """Extract useful readings from device status."""
+        s = status.get("status", status)
+
+        em1_0 = s.get("em1:0", {})
+        em1_1 = s.get("em1:1", {})
+        em1data_0 = s.get("em1data:0", {})
+        em1data_1 = s.get("em1data:1", {})
+        switch = s.get("switch:0", {})
+        wifi = s.get("wifi", {})
+
+        return {
+            # Canale 0 — produzione pannelli → inverter
+            "ch0_act_power": em1_0.get("act_power"),
+            "ch0_aprt_power": em1_0.get("aprt_power"),
+            "ch0_current": em1_0.get("current"),
+            "ch0_voltage": em1_0.get("voltage"),
+            "ch0_pf": em1_0.get("pf"),
+            "ch0_total_act_energy": em1data_0.get("total_act_energy"),
+            "ch0_total_ret_energy": em1data_0.get("total_act_ret_energy"),
+            # Canale 1 — inverter → casa/rete
+            "ch1_act_power": em1_1.get("act_power"),
+            "ch1_aprt_power": em1_1.get("aprt_power"),
+            "ch1_current": em1_1.get("current"),
+            "ch1_voltage": em1_1.get("voltage"),
+            "ch1_pf": em1_1.get("pf"),
+            "ch1_total_act_energy": em1data_1.get("total_act_energy"),
+            "ch1_total_ret_energy": em1data_1.get("total_act_ret_energy"),
+            # Switch / stato dispositivo
+            "switch_output": switch.get("output"),
+            "temperature": switch.get("temperature", {}).get("tC"),
+            "wifi_rssi": wifi.get("rssi"),
+            "online": s.get("online", status.get("online")),
+            "unixtime": s.get("sys", {}).get("unixtime"),
+            "uptime": s.get("sys", {}).get("uptime"),
+        }
diff --git a/templates/index.html b/templates/index.html
new file mode 100644
index 0000000..704826b
--- /dev/null
+++ b/templates/index.html
@@ -0,0 +1,462 @@
+<!DOCTYPE html>
+<html lang="it">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>ShellyDash — Monitoraggio Fotovoltaico</title>
+<script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.7/dist/chart.umd.min.js"></script>
+<style>
+*{margin:0;padding:0;box-sizing:border-box}
+body{
+  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
+  background:#0f172a;color:#e2e8f0;min-height:100vh;
+}
+.header{
+  background:#1e293b;padding:16px 24px;display:flex;align-items:center;
+  justify-content:space-between;border-bottom:1px solid #334155;
+}
+.header h1{font-size:20px;font-weight:600;display:flex;align-items:center;gap:10px}
+.header h1 span{color:#38bdf8}
+.badge{
+  display:inline-block;padding:4px 12px;border-radius:12px;font-size:12px;font-weight:600;
+}
+.badge.online{background:#166534;color:#86efac}
+.badge.offline{background:#7f1d1d;color:#fca5a5}
+.container{max-width:1400px;margin:0 auto;padding:20px}
+
+/* Gauge row */
+.gauge-row{display:flex;gap:20px;margin-bottom:20px;flex-wrap:wrap}
+.gauge-card{
+  flex:1;min-width:300px;background:#1e293b;border-radius:16px;padding:16px 20px 10px;
+  border:1px solid #334155;display:flex;flex-direction:column;align-items:center;
+}
+.gauge-card h2{font-size:13px;color:#94a3b8;margin-bottom:2px;text-transform:uppercase;letter-spacing:1px}
+.gauge-wrapper{width:100%;max-width:360px;margin:0 auto}
+
+/* Info cards */
+.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:20px}
+.card{
+  background:#1e293b;border-radius:12px;padding:14px;border:1px solid #334155;text-align:center;
+}
+.card .label{font-size:11px;text-transform:uppercase;color:#64748b;letter-spacing:1px}
+.card .num{font-size:24px;font-weight:700;margin-top:3px}
+.card .num.green{color:#4ade80}
+.card .num.blue{color:#38bdf8}
+.card .num.amber{color:#fbbf24}
+.card .num.red{color:#f87171}
+.card .num.purple{color:#a78bfa}
+
+/* History chart */
+.chart-section{background:#1e293b;border-radius:16px;padding:20px;border:1px solid #334155;margin-bottom:20px}
+.chart-section h2{font-size:13px;color:#94a3b8;margin-bottom:10px;text-transform:uppercase;letter-spacing:1px}
+.chart-section canvas{max-height:280px}
+
+/* Energy section */
+.energy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
+.energy-card{background:#1e293b;border-radius:12px;padding:14px;border:1px solid #334155;text-align:center}
+.energy-card .label{font-size:11px;color:#64748b;text-transform:uppercase}
+.energy-card .num{font-size:22px;font-weight:700;margin-top:3px}
+.energy-card .num.green{color:#4ade80}
+.energy-card .num.amber{color:#fbbf24}
+.energy-card .num.blue{color:#38bdf8}
+
+/* Delta highlight */
+.delta-highlight{
+  background:linear-gradient(135deg,#1e293b,#0f172a);
+  border:2px solid #334155;border-radius:16px;padding:14px 24px;
+  display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;
+}
+.delta-highlight .label{font-size:12px;color:#94a3b8}
+.delta-highlight .value{font-size:38px;font-weight:700}
+.delta-highlight .value.positive{color:#4ade80}
+.delta-highlight .value.negative{color:#f87171}
+.delta-highlight .sub{font-size:13px;color:#64748b}
+
+.loading{text-align:center;padding:60px;color:#64748b;font-size:18px}
+
+/* Responsive */
+@media(max-width:768px){
+  .header h1{font-size:15px}
+  .gauge-card{min-width:100%}
+  .delta-highlight{flex-direction:column;gap:8px;text-align:center}
+  .delta-highlight .value{font-size:28px}
+}
+
+.btn-range{
+  background:#334155;color:#94a3b8;border:none;padding:6px 14px;border-radius:8px;
+  font-size:12px;font-weight:600;cursor:pointer;transition:all 0.2s;
+}
+.btn-range:hover{background:#475569;color:#e2e8f0}
+.btn-range.active{background:#38bdf8;color:#0f172a}
+</style>
+</head>
+<body>
+<div class="header">
+  <h1>⚡ <span>ShellyDash</span> — Fotovoltaico</h1>
+  <div><span id="statusBadge" class="badge offline">⏳ Caricamento...</span></div>
+</div>
+<div class="container" id="app">
+  <div class="loading" id="loading">Caricamento dati...</div>
+  <div id="dashboard" style="display:none">
+
+    <!-- Delta highlight -->
+    <div class="delta-highlight" id="deltaBox">
+      <div>
+        <div class="label">SURPLUS / DEFICIT</div>
+        <div class="value" id="deltaValue">--</div>
+        <div class="sub">Produzione − Consumo</div>
+      </div>
+      <div style="text-align:right" id="deltaMeta">
+        <div class="label">Produzione</div>
+        <div style="font-size:20px;font-weight:600;color:#4ade80" id="prodValue">-- W</div>
+        <div class="label" style="margin-top:5px">Consumo</div>
+        <div style="font-size:20px;font-weight:600;color:#fbbf24" id="consValue">-- W</div>
+      </div>
+    </div>
+
+    <!-- Two gauge widgets -->
+    <div class="gauge-row">
+      <div class="gauge-card">
+        <h2>Produzione Pannelli</h2>
+        <div class="gauge-wrapper">
+          <canvas id="gaugeProd"></canvas>
+        </div>
+      </div>
+      <div class="gauge-card">
+        <h2>Consumo Casa</h2>
+        <div class="gauge-wrapper">
+          <canvas id="gaugeCons"></canvas>
+        </div>
+      </div>
+    </div>
+
+    <!-- Cards row -->
+    <div class="cards">
+      <div class="card">
+        <div class="label">Tensione</div>
+        <div class="num blue" id="voltageCard">-- V</div>
+      </div>
+      <div class="card">
+        <div class="label">Fattore Potenza</div>
+        <div class="num purple" id="pfCard">--</div>
+      </div>
+      <div class="card">
+        <div class="label">Corrente Fase 1</div>
+        <div class="num" id="ch0currentCard" style="color:#94a3b8">-- A</div>
+      </div>
+      <div class="card">
+        <div class="label">Corrente Fase 2</div>
+        <div class="num" id="ch1currentCard" style="color:#94a3b8">-- A</div>
+      </div>
+    </div>
+
+    <!-- Energy + History -->
+    <div class="chart-section">
+      <h2>Energia Oggi</h2>
+      <div class="energy-grid" style="margin-bottom:16px">
+        <div class="energy-card">
+          <div class="label">Prodotta</div>
+          <div class="num green" id="energyProd">-- kWh</div>
+        </div>
+        <div class="energy-card">
+          <div class="label">Consumata</div>
+          <div class="num amber" id="energyCons">-- kWh</div>
+        </div>
+        <div class="energy-card">
+          <div class="label">Immessa in Rete</div>
+          <div class="num blue" id="energyGrid">-- kWh</div>
+        </div>
+      </div>
+      <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:10px">
+        <h2>Storico</h2>
+        <div style="display:flex;gap:8px">
+          <button class="btn-range active" data-hours="24">24h</button>
+          <button class="btn-range" data-hours="72">3gg</button>
+          <button class="btn-range" data-hours="168">7gg</button>
+        </div>
+      </div>
+      <canvas id="historyChart"></canvas>
+    </div>
+  </div>
+</div>
+
+<script>
+// ── Gauge Plugin (semi-circular needle + scale) ───────────────────
+// Accepts config via chart.options.gaugeConfig
+const gaugePlugin = {
+  id: 'gaugePlugin',
+  afterDraw(chart) {
+    const cfg = chart.options.gaugeConfig || {};
+    const {ctx, chartArea: {top, bottom, left, right}} = chart;
+    const value = cfg.value || 0;
+    const maxVal = cfg.max || 6000;
+    const color = cfg.color || '#4ade80';
+    const unit = cfg.unit || 'W';
+    const labelText = cfg.label || '';
+
+    const centerX = (left + right) / 2;
+    const centerY = bottom - 8;
+    const radius = Math.min(right - left, (bottom - top) * 2) / 2 - 14;
+
+    // ── Draw scale ticks ──
+    const majorStep = maxVal <= 3000 ? 500 : 1000;
+    const minorStep = majorStep / 2;
+    const startAngle = Math.PI;       // 180° (left)
+    const endAngle = 2 * Math.PI;     // 360° (right)
+
+    ctx.save();
+
+    // Major ticks + numbers
+    for (let v = 0; v <= maxVal; v += majorStep) {
+      const frac = v / maxVal;
+      const angle = startAngle + frac * Math.PI;
+      const x1 = centerX + (radius - 8) * Math.cos(angle);
+      const y1 = centerY + (radius - 8) * Math.sin(angle);
+      const x2 = centerX + (radius - 20) * Math.cos(angle);
+      const y2 = centerY + (radius - 20) * Math.sin(angle);
+
+      ctx.beginPath();
+      ctx.moveTo(x1, y1);
+      ctx.lineTo(x2, y2);
+      ctx.strokeStyle = '#64748b';
+      ctx.lineWidth = 2;
+      ctx.stroke();
+
+      // Number label
+      const lx = centerX + (radius - 32) * Math.cos(angle);
+      const ly = centerY + (radius - 32) * Math.sin(angle);
+      ctx.fillStyle = '#94a3b8';
+      ctx.font = '11px -apple-system, sans-serif';
+      ctx.textAlign = 'center';
+      ctx.textBaseline = 'middle';
+      const displayNum = v >= 1000 ? (v/1000) + 'k' : v;
+      ctx.fillText(displayNum, lx, ly);
+    }
+
+    // Minor ticks
+    for (let v = minorStep; v < maxVal; v += minorStep) {
+      // skip if also a major tick
+      if (v % majorStep === 0) continue;
+      const frac = v / maxVal;
+      const angle = startAngle + frac * Math.PI;
+      const x1 = centerX + (radius - 6) * Math.cos(angle);
+      const y1 = centerY + (radius - 6) * Math.sin(angle);
+      const x2 = centerX + (radius - 14) * Math.cos(angle);
+      const y2 = centerY + (radius - 14) * Math.sin(angle);
+      ctx.beginPath();
+      ctx.moveTo(x1, y1);
+      ctx.lineTo(x2, y2);
+      ctx.strokeStyle = '#475569';
+      ctx.lineWidth = 1.5;
+      ctx.stroke();
+    }
+
+    ctx.restore();
+
+    // ── Needle ──
+    const needleAngle = startAngle + (Math.min(value, maxVal) / maxVal) * Math.PI;
+    ctx.save();
+    ctx.translate(centerX, centerY);
+    ctx.rotate(needleAngle);
+    ctx.beginPath();
+    ctx.moveTo(0, -5);
+    ctx.lineTo(radius - 16, 0);
+    ctx.lineTo(0, 5);
+    ctx.closePath();
+    ctx.fillStyle = color;
+    ctx.fill();
+    ctx.restore();
+
+    // ── Center dot ──
+    ctx.beginPath();
+    ctx.arc(centerX, centerY, 7, 0, 2 * Math.PI);
+    ctx.fillStyle = color;
+    ctx.fill();
+    ctx.strokeStyle = '#1e293b';
+    ctx.lineWidth = 2.5;
+    ctx.stroke();
+
+    // ── Value text ──
+    ctx.fillStyle = '#e2e8f0';
+    ctx.font = 'bold 26px -apple-system, sans-serif';
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'bottom';
+    const displayVal = value >= 1000 ? (value/1000).toFixed(1) + ' kW' : Math.round(value) + ' ' + unit;
+    ctx.fillText(displayVal, centerX, centerY + 50);
+
+    if (labelText) {
+      ctx.fillStyle = '#64748b';
+      ctx.font = '12px -apple-system, sans-serif';
+      ctx.textBaseline = 'top';
+      ctx.fillText(labelText, centerX, centerY + 52);
+    }
+  }
+};
+
+// ── State ─────────────────────────────────────────────────────────
+let historyChart = null;
+let rangeHours = 24;
+let gaugeCharts = {};
+
+// ── Init gauge ────────────────────────────────────────────────────
+function initGauge(canvasId, maxVal) {
+  const canvas = document.getElementById(canvasId);
+  if (!canvas) return null;
+  const parent = canvas.parentElement;
+  canvas.width = parent.clientWidth || 340;
+  canvas.height = Math.min(canvas.width * 0.52, 220);
+
+  // dummy data — actual drawing is in the plugin
+  return new Chart(canvas.getContext('2d'), {
+    type: 'doughnut',
+    data: {
+      datasets: [{ data: [1], backgroundColor: ['transparent'], borderWidth: 0 }]
+    },
+    options: {
+      responsive: true,
+      maintainAspectRatio: false,
+      cutout: '92%',
+      plugins: { tooltip: { enabled: false }, legend: { display: false } },
+      gaugeConfig: { value: 0, max: maxVal, color: '#4ade80', unit: 'W', label: '' },
+    },
+    plugins: [gaugePlugin]
+  });
+}
+
+function updateGauge(chart, value, maxVal, color, label) {
+  if (!chart) return;
+  chart.options.gaugeConfig.value = value;
+  chart.options.gaugeConfig.max = maxVal;
+  if (color) chart.options.gaugeConfig.color = color;
+  if (label) chart.options.gaugeConfig.label = label;
+  chart.update();
+}
+
+// ── Init history chart ────────────────────────────────────────────
+function initHistoryChart() {
+  const canvas = document.getElementById('historyChart');
+  if (!canvas) return null;
+  const ctx = canvas.getContext('2d');
+
+  return new Chart(ctx, {
+    type: 'line',
+    data: { labels: [], datasets: [
+      { label: 'Produzione', data: [], borderColor: '#4ade80', backgroundColor: 'rgba(74,222,128,0.08)', fill: true, tension: 0.3, pointRadius: 0 },
+      { label: 'Consumo', data: [], borderColor: '#fbbf24', backgroundColor: 'rgba(251,191,36,0.08)', fill: true, tension: 0.3, pointRadius: 0 },
+    ]},
+    options: {
+      responsive: true, maintainAspectRatio: false,
+      interaction: { mode: 'index', intersect: false },
+      plugins: { legend: { labels: { color: '#94a3b8', boxWidth: 12, padding: 12 } } },
+      scales: {
+        x: { ticks: { color: '#64748b', maxTicksLimit: 10 }, grid: { color: '#1e293b' } },
+        y: { ticks: { color: '#64748b' }, grid: { color: '#334155' }, beginAtZero: true }
+      }
+    }
+  });
+}
+
+function updateHistoryChart(chart, data) {
+  if (!chart || !data || !data.length) return;
+  const labels = data.map(d => {
+    const t = new Date(d.ts * 1000);
+    return t.toLocaleTimeString('it', {hour:'2-digit', minute:'2-digit'});
+  });
+  const prod = data.map(d => d.production_w ?? 0);
+  const cons = data.map(d => Math.abs(d.consumption_w ?? 0));
+
+  chart.data.labels = labels;
+  chart.data.datasets[0].data = prod;
+  chart.data.datasets[1].data = cons;
+  chart.update('none');
+}
+
+// ── Fetch & update ────────────────────────────────────────────────
+async function fetchStatus() {
+  const r = await fetch('/api/status');
+  return r.json();
+}
+
+async function fetchHistory(hours) {
+  const r = await fetch(`/api/history?hours=${hours}`);
+  return r.json();
+}
+
+async function fetchEnergyToday() {
+  const r = await fetch('/api/energy/today');
+  return r.json();
+}
+
+function updateUI(status) {
+  if (!status.ok) return;
+
+  const p = status.production_w;
+  const c = status.consumption_w;
+  const delta = status.delta_w;
+
+  // Badge
+  const badge = document.getElementById('statusBadge');
+  badge.textContent = status.online ? '☁️ Online' : '⚠️ Offline';
+  badge.className = 'badge ' + (status.online ? 'online' : 'offline');
+
+  // Delta
+  document.getElementById('deltaValue').textContent = (delta >= 0 ? '+' : '') + delta.toFixed(0) + ' W';
+  document.getElementById('deltaValue').className = 'value ' + (delta >= 0 ? 'positive' : 'negative');
+  document.getElementById('prodValue').textContent = p.toFixed(0) + ' W';
+  document.getElementById('consValue').textContent = c.toFixed(0) + ' W';
+
+  // Cards
+  document.getElementById('voltageCard').textContent = (status.voltage || 0).toFixed(1) + ' V';
+  document.getElementById('pfCard').textContent = (status.ch0_pf || 0).toFixed(2);
+  document.getElementById('ch0currentCard').textContent = (status.ch0_current || 0).toFixed(2) + ' A';
+  document.getElementById('ch1currentCard').textContent = (status.ch1_current || 0).toFixed(2) + ' A';
+
+  // Gauges — production (max 6000W) + consumption (max 3000W)
+  updateGauge(gaugeCharts.prod, p, 6000, '#4ade80', 'Produzione');
+  updateGauge(gaugeCharts.cons, c, 3000, '#fbbf24', 'Consumo');
+}
+
+async function refreshAll() {
+  try {
+    const status = await fetchStatus();
+    if (status.ok || gaugeCharts.prod) {
+      document.getElementById('loading').style.display = 'none';
+      document.getElementById('dashboard').style.display = 'block';
+      if (status.ok) updateUI(status);
+    }
+
+    const history = await fetchHistory(rangeHours);
+    if (history.ok && historyChart) {
+      updateHistoryChart(historyChart, history.data);
+    }
+
+    const energy = await fetchEnergyToday();
+    if (energy.ok) {
+      document.getElementById('energyProd').textContent = (energy.production_kwh || 0).toFixed(2) + ' kWh';
+      document.getElementById('energyCons').textContent = (energy.consumption_kwh || 0).toFixed(2) + ' kWh';
+      document.getElementById('energyGrid').textContent = (energy.grid_returned_kwh || 0).toFixed(2) + ' kWh';
+    }
+  } catch(e) {
+    console.error('Refresh error:', e);
+  }
+}
+
+// ── Range buttons ─────────────────────────────────────────────────
+document.addEventListener('click', function(e) {
+  const btn = e.target.closest('.btn-range');
+  if (!btn) return;
+  document.querySelectorAll('.btn-range').forEach(b => b.classList.remove('active'));
+  btn.classList.add('active');
+  rangeHours = parseInt(btn.dataset.hours);
+  refreshAll();
+});
+
+// ── Start ─────────────────────────────────────────────────────────
+gaugeCharts.prod = initGauge('gaugeProd', 6000);
+gaugeCharts.cons = initGauge('gaugeCons', 3000);
+historyChart = initHistoryChart();
+refreshAll();
+setInterval(refreshAll, 15000);
+</script>
+</body>
+</html>