Initial commit

2025-11-15 13:38:10 +02:00
commit bfe5d92add
21 changed files with 4627 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,26 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+.env
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
--- a/README.md
+++ b/README.md
@@ -0,0 +1,89 @@
+# EV Infotainment UI (Demo Project)
+
+This project is a mock EV infotainment system built with React + TypeScript + Vite, designed to simulate how an in-car display could show battery State of Health (SoH) and charging session history.
+
+![alt text](src/assets/image.png)
+
+It includes:
+
+- A charger simulator API (mock backend)
+- A beautiful infotainment-style UI
+- A fixed 21:9 car-like viewport
+- A bottom navigation bar fixed within the screen
+- Smooth scrolling and EV-inspired design elements
+
+This UI is intended for demo purposes as part of a larger system where: Charger → Backend → Infotainment UI (charger sends charging data → backend calculates SoH → UI visualizes last 30 days).
+
+## Features
+
+### Battery Health Visualization
+
+Live SoH reading for the latest charging session
+
+Change vs previous session
+
+Temperature, SoC, and energy added summary
+
+### Trend Chart
+
+- 30-day SoH trend displayed with a custom SVG line chart
+- Session points rendered with minimal dependencies
+
+### Charging History
+
+- Scrollable list of all charging sessions
+- Shows SoH, Δ vs previous, and energy added for each session
+
+### Infotainment-Style UI
+
+- Status bar with icons (time, temperature, connectivity)
+- Quick control strip (AC, night mode, eco mode – static)
+- Bottom navigation menu (Home / Battery / Trips / Settings)
+- Fixed 21:9 viewport with realistic bezel and rounded corners
+
+### Mock Backend
+
+- Generates realistic charging history for the last 30 days
+- SoH degrades slowly over time
+- Used when VITE_USE_MOCK_API=true
+
+## Tech Stack
+
+- React (with TypeScript)
+- Vite
+- CSS only
+
+## Getting Started
+
+1. Install dependencies
+
+```bash
+npm install
+```
+
+2. Run in mock mode
+
+Create a .env file:
+
+```ini
+VITE_USE_MOCK_API=true
+```
+
+Then start the dev server:
+
+```bash
+npm run dev
+```
+
+The infotainment UI will open at `http://localhost:5173/`.
+
+3. Using a real backend (optional)
+
+Set:
+
+```ini
+VITE_USE_MOCK_API=false
+VITE_API_BASE_URL=https://your-backend.example.com
+```
+
+The UI will fetch real session data from the backend.
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -0,0 +1,23 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs.flat.recommended,
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+    },
+  },
+])
--- a/index.html
+++ b/index.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>infotainment-ui</title>
+  </head>
+  <body>
+    <div id="viewport-wrapper">
+      <div id="viewport">
+        <div id="root"></div>
+      </div>
+    </div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -0,0 +1,30 @@
+{
+  "name": "infotainment-ui",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.1",
+    "@types/node": "^24.10.0",
+    "@types/react": "^19.2.2",
+    "@types/react-dom": "^19.2.2",
+    "@vitejs/plugin-react": "^5.1.0",
+    "eslint": "^9.39.1",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-react-refresh": "^0.4.24",
+    "globals": "^16.5.0",
+    "typescript": "~5.9.3",
+    "typescript-eslint": "^8.46.3",
+    "vite": "^7.2.2"
+  }
+}
--- a/public/vite.svg
+++ b/public/vite.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>
--- a/src/App.css
+++ b/src/App.css
@@ -0,0 +1,42 @@
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -0,0 +1,446 @@
+import React, { useEffect, useMemo, useState } from "react";
+import type { ChargingSession } from "./types";
+import { fetchSessions } from "./api";
+
+type LoadState = "idle" | "loading" | "success" | "error";
+
+const App: React.FC = () => {
+  const [sessions, setSessions] = useState<ChargingSession[]>([]);
+  const [loadState, setLoadState] = useState<LoadState>("idle");
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+
+  const [activeTab] = useState<"home" | "battery" | "trips" | "settings">(
+    "battery"
+  );
+
+  useEffect(() => {
+    const load = async () => {
+      setLoadState("loading");
+      setErrorMessage(null);
+
+      try {
+        const { sessions } = await fetchSessions(30);
+        const sorted = [...sessions].sort(
+          (a, b) => new Date(b.endedAt).getTime() - new Date(a.endedAt).getTime()
+        );
+        setSessions(sorted);
+        setLoadState("success");
+      } catch (err) {
+        console.error(err);
+        setErrorMessage("Could not load charging data.");
+        setLoadState("error");
+      }
+    };
+
+    load();
+  }, []);
+
+  const latestSession = sessions[0] ?? null;
+  const previousSession = sessions[1] ?? null;
+
+  const sohChange = useMemo(() => {
+    if (!latestSession || !previousSession) return null;
+    return latestSession.sohEnd - previousSession.sohEnd;
+  }, [latestSession, previousSession]);
+
+  const sohTrendPoints = useMemo(() => {
+    return sessions
+      .slice()
+      .reverse()
+      .map((s) => ({
+        label: new Date(s.endedAt).toLocaleDateString(undefined, {
+          month: "short",
+          day: "numeric",
+        }),
+        value: (s.sohStart + s.sohEnd) / 2,
+      }));
+  }, [sessions]);
+
+  const now = new Date();
+
+  return (
+    <div className="screen">
+      {/* STATUS BAR – topmost, like Android Auto / CarPlay */}
+      <div className="status-bar">
+        <div className="status-left">
+          <span className="status-time">
+            {now.toLocaleTimeString(undefined, {
+              hour: "2-digit",
+              minute: "2-digit",
+            })}
+          </span>
+          <span className="status-temp">-2°C</span>
+        </div>
+        <div className="status-center">
+          <span className="status-car">
+            🚗
+            <span className="status-car-range">320 km</span>
+          </span>
+        </div>
+        <div className="status-right">
+          <span className="status-icon">📶</span>
+          <span className="status-icon">LTE</span>
+          <span className="status-icon">🔊</span>
+        </div>
+      </div>
+
+      {/* APP HEADER */}
+      <header className="top-bar">
+        <div className="top-bar-left">
+          <span className="brand">Battery Health</span>
+          <span className="subtitle">Last 30 days</span>
+        </div>
+        <div className="top-bar-right">
+          <span className="status-dot" />
+          <span className="status-label">
+            {loadState === "loading"
+              ? "Syncing…"
+              : loadState === "error"
+              ? "Offline"
+              : "Connected"}
+          </span>
+        </div>
+      </header>
+
+      {/* QUICK CONTROL STRIP – static toggles to feel “car-like” */}
+      <div className="quick-strip">
+        <button className="quick-btn quick-btn-active">
+          <span className="quick-icon">❄️</span>
+          <span className="quick-label">AC Auto</span>
+        </button>
+        <button className="quick-btn">
+          <span className="quick-icon">🔥</span>
+          <span className="quick-label">Seat</span>
+        </button>
+        <button className="quick-btn">
+          <span className="quick-icon">🌙</span>
+          <span className="quick-label">Night</span>
+        </button>
+        <button className="quick-btn">
+          <span className="quick-icon">⚡</span>
+          <span className="quick-label">Eco</span>
+        </button>
+      </div>
+
+      {/* MAIN CONTENT */}
+      {loadState === "loading" && (
+        <div className="center-message">Loading charging history…</div>
+      )}
+
+      {loadState === "error" && (
+        <div className="center-message error">
+          {errorMessage ?? "Something went wrong."}
+        </div>
+      )}
+
+      {loadState === "success" && sessions.length === 0 && (
+        <div className="center-message">
+          No charging sessions found for the last 30 days.
+        </div>
+      )}
+
+      {loadState === "success" && sessions.length > 0 && (
+        <main className="content">
+          {/* Top section: current SoH + change */}
+          <section className="panel panel-main">
+            <div className="panel-header">
+              <h2>Current battery health (SoH)</h2>
+              <span className="panel-subtitle">
+                Based on last completed charging session
+              </span>
+            </div>
+
+            <div className="current-soh-row">
+              <div className="current-soh-value">
+                <span className="label">SoH now</span>
+                <span className="value">
+                  {latestSession ? latestSession.sohEnd.toFixed(1) : "--"}%
+                </span>
+                <span className="secondary">
+                  Session ended{" "}
+                  {new Date(latestSession!.endedAt).toLocaleString(undefined, {
+                    weekday: "short",
+                    hour: "2-digit",
+                    minute: "2-digit",
+                  })}
+                </span>
+              </div>
+
+              <div className="soh-change">
+                <span className="label">Change since last session</span>
+                {sohChange !== null ? (
+                  <span
+                    className={
+                      "delta-tag " +
+                      (sohChange > 0
+                        ? "delta-up"
+                        : sohChange < 0
+                        ? "delta-down"
+                        : "delta-flat")
+                    }
+                  >
+                    {sohChange > 0 ? "+" : ""}
+                    {sohChange.toFixed(2)} %
+                  </span>
+                ) : (
+                  <span className="secondary">Not enough history yet</span>
+                )}
+                {sohChange !== null && (
+                  <span className="secondary">
+                    {sohChange > 0
+                      ? "Slightly improved compared to previous session."
+                      : sohChange < 0
+                      ? "Slightly decreased. Frequent fast-charging and heat may affect this."
+                      : "No visible change compared to previous session."}
+                  </span>
+                )}
+              </div>
+            </div>
+
+            <div className="summary-row">
+              {typeof latestSession?.energyAddedKWh === "number" && (
+                <div className="summary-item">
+                  <span className="label">Energy added</span>
+                  <span className="value">
+                    {latestSession.energyAddedKWh.toFixed(1)} kWh
+                  </span>
+                </div>
+              )}
+
+              {typeof latestSession?.avgTempC === "number" && (
+                <div className="summary-item">
+                  <span className="label">Avg. pack temperature</span>
+                  <span className="value">
+                    {latestSession.avgTempC.toFixed(1)} °C
+                  </span>
+                </div>
+              )}
+
+              {typeof latestSession?.socStart === "number" &&
+                typeof latestSession?.socEnd === "number" && (
+                  <div className="summary-item">
+                    <span className="label">SoC change</span>
+                    <span className="value">
+                      {latestSession.socStart}% → {latestSession.socEnd}%
+                    </span>
+                  </div>
+                )}
+            </div>
+          </section>
+
+          {/* Middle section: SoH trend */}
+          <section className="panel panel-chart">
+            <div className="panel-header">
+              <h2>SoH trend (last 30 days)</h2>
+              <span className="panel-subtitle">
+                Each point is one charging session
+              </span>
+            </div>
+
+            <SimpleTrendChart points={sohTrendPoints} />
+          </section>
+
+          {/* Bottom section: session list */}
+          <section className="panel panel-list">
+            <div className="panel-header">
+              <h2>Charging sessions</h2>
+              <span className="panel-subtitle">
+                {sessions.length} session
+                {sessions.length !== 1 ? "s" : ""} in the last 30 days
+              </span>
+            </div>
+
+            <div className="session-list">
+              {sessions.map((session, index) => {
+                const prev = sessions[index + 1];
+                const delta =
+                  prev != null
+                    ? session.sohEnd - prev.sohEnd
+                    : undefined;
+
+                return (
+                  <SessionRow
+                    key={session.id}
+                    session={session}
+                    sohDelta={delta}
+                  />
+                );
+              })}
+            </div>
+          </section>
+        </main>
+      )}
+
+      {/* BOTTOM NAV – static icons / labels */}
+      <nav className="bottom-nav">
+        <button
+          className={
+            "nav-button " + (activeTab === "home" ? "nav-button-active" : "")
+          }
+        >
+          <span className="nav-icon">🏠</span>
+          <span className="nav-label">Home</span>
+        </button>
+        <button
+          className={
+            "nav-button " + (activeTab === "battery" ? "nav-button-active" : "")
+          }
+        >
+          <span className="nav-icon">🔋</span>
+          <span className="nav-label">Battery</span>
+        </button>
+        <button
+          className={
+            "nav-button " + (activeTab === "trips" ? "nav-button-active" : "")
+          }
+        >
+          <span className="nav-icon">🗺️</span>
+          <span className="nav-label">Trips</span>
+        </button>
+        <button
+          className={
+            "nav-button " +
+            (activeTab === "settings" ? "nav-button-active" : "")
+          }
+        >
+          <span className="nav-icon">⚙️</span>
+          <span className="nav-label">Settings</span>
+        </button>
+      </nav>
+    </div>
+  );
+};
+
+interface TrendPoint {
+  label: string;
+  value: number;
+}
+
+interface SimpleTrendChartProps {
+  points: TrendPoint[];
+}
+
+const SimpleTrendChart: React.FC<SimpleTrendChartProps> = ({ points }) => {
+  if (points.length === 0) {
+    return <div className="chart-placeholder">No data yet.</div>;
+  }
+
+  const values = points.map((p) => p.value);
+  const min = Math.min(...values);
+  const max = Math.max(...values);
+  const padding = 4;
+
+  const norm = (v: number) => {
+    if (max === min) return 50;
+    return (
+      padding +
+      ((max - v) / (max - min)) * (100 - padding * 2)
+    );
+  };
+
+  const stepX = points.length > 1 ? 100 / (points.length - 1) : 50;
+
+  const pathD = points
+    .map((p, i) => {
+      const x = i * stepX;
+      const y = norm(p.value);
+      return `${i === 0 ? "M" : "L"} ${x} ${y}`;
+    })
+    .join(" ");
+
+  return (
+    <div className="chart-wrapper">
+      <svg viewBox="0 0 100 100" className="chart-svg" preserveAspectRatio="none">
+        <path d={pathD} className="chart-line" fill="none" />
+        {points.map((p, i) => {
+          const x = i * stepX;
+          const y = norm(p.value);
+          return (
+            <circle
+              key={p.label + i}
+              cx={x}
+              cy={y}
+              r={1.2}
+              className="chart-dot"
+            />
+          );
+        })}
+      </svg>
+      <div className="chart-labels">
+        {points.map((p, i) => (
+          <span key={p.label + i} className="chart-label">
+            {p.label}
+          </span>
+        ))}
+      </div>
+    </div>
+  );
+};
+
+interface SessionRowProps {
+  session: ChargingSession;
+  sohDelta?: number;
+}
+
+const SessionRow: React.FC<SessionRowProps> = ({ session, sohDelta }) => {
+  const end = new Date(session.endedAt);
+
+  return (
+    <div className="session-row">
+      <div className="session-main">
+        <div className="session-title">
+          {end.toLocaleDateString(undefined, {
+            weekday: "short",
+            month: "short",
+            day: "numeric",
+          })}{" "}
+          ·{" "}
+          {end.toLocaleTimeString(undefined, {
+            hour: "2-digit",
+            minute: "2-digit",
+          })}
+        </div>
+        <div className="session-subtitle">
+          {session.locationName ?? "Unknown location"}
+        </div>
+      </div>
+
+      <div className="session-metrics">
+        <div className="session-metric">
+          <span className="label">SoH</span>
+          <span className="value">{session.sohEnd.toFixed(1)}%</span>
+        </div>
+
+        {typeof sohDelta === "number" && (
+          <div className="session-metric">
+            <span className="label">Δ vs prev</span>
+            <span
+              className={
+                "delta-tag small " +
+                (sohDelta > 0
+                  ? "delta-up"
+                  : sohDelta < 0
+                  ? "delta-down"
+                  : "delta-flat")
+              }
+            >
+              {sohDelta > 0 ? "+" : ""}
+              {sohDelta.toFixed(2)}%
+            </span>
+          </div>
+        )}
+
+        {typeof session.energyAddedKWh === "number" && (
+          <div className="session-metric">
+            <span className="label">Energy</span>
+            <span className="value">
+              {session.energyAddedKWh.toFixed(1)} kWh
+            </span>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};
+
+export default App;
--- a/src/api.ts
+++ b/src/api.ts
@@ -0,0 +1,29 @@
+import type { SessionsResponse } from "./types";
+import { generateMockSessions } from "./mocks/mockSessions";
+
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL ?? "https://example.com";
+const USE_MOCK = import.meta.env.VITE_USE_MOCK_API === "true";
+
+export async function fetchSessions(days: number): Promise<SessionsResponse> {
+  if (USE_MOCK) {
+    await delay(400);
+    const sessions = generateMockSessions(days);
+    return { sessions };
+  }
+
+  const res = await fetch(`${API_BASE_URL}/api/sessions?days=${days}`, {
+    headers: {
+      Accept: "application/json",
+    },
+  });
+
+  if (!res.ok) {
+    throw new Error(`HTTP ${res.status}`);
+  }
+
+  return (await res.json()) as SessionsResponse;
+}
+
+function delay(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
--- a/src/assets/image.png
+++ b/src/assets/image.png
--- a/src/assets/react.svg
+++ b/src/assets/react.svg
@@ -0,0 +1 @@
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--- a/src/index.css
+++ b/src/index.css
@@ -0,0 +1,68 @@
+:root {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -0,0 +1,10 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+import "./styles.css";
+
+ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);
--- a/src/mocks/mockSessions.ts
+++ b/src/mocks/mockSessions.ts
@@ -0,0 +1,68 @@
+import type { ChargingSession } from "../types";
+
+function randomBetween(min: number, max: number): number {
+  return min + Math.random() * (max - min);
+}
+
+const LOCATIONS = [
+  "ABC Lataus, Lahti",
+  "K-Lataus, Espoo",
+  "Neste, Vantaa",
+  "Kempower Demo Site, Lahti",
+  "Helen Lataus, Helsinki",
+];
+
+export function generateMockSessions(days = 30): ChargingSession[] {
+  const sessions: ChargingSession[] = [];
+
+  const now = new Date();
+  let currentSoh = 95.0;
+  const MIN_SOH = 80.0;
+
+  for (let offset = days - 1; offset >= 0; offset--) {
+    const dayDate = new Date(now);
+    dayDate.setDate(dayDate.getDate() - offset);
+
+    const hasSession = Math.random() < 0.6;
+    if (!hasSession) continue;
+
+    const chargeMinutes = Math.floor(randomBetween(20, 90));
+
+    const startHour = randomBetween(7, 21);
+    const startedAt = new Date(dayDate);
+    startedAt.setHours(startHour, randomBetween(0, 59), 0, 0);
+
+    const endedAt = new Date(startedAt);
+    endedAt.setMinutes(endedAt.getMinutes() + chargeMinutes);
+
+    const socStart = Math.round(randomBetween(10, 40));
+    const socEnd = Math.round(randomBetween(80, 100));
+    const energyAddedKWh = +randomBetween(15, 60).toFixed(1);
+    const avgTempC = +randomBetween(-5, 30).toFixed(1);
+
+    const sohStart = currentSoh;
+    const delta = randomBetween(-0.08, -0.01);
+    currentSoh = Math.max(MIN_SOH, +(currentSoh + delta).toFixed(2));
+    const sohEnd = currentSoh;
+
+    const locationName =
+      LOCATIONS[Math.floor(Math.random() * LOCATIONS.length)];
+
+    sessions.push({
+      id: `mock-${offset}`,
+      startedAt: startedAt.toISOString(),
+      endedAt: endedAt.toISOString(),
+      sohStart,
+      sohEnd,
+      socStart,
+      socEnd,
+      energyAddedKWh,
+      avgTempC,
+      locationName,
+    });
+  }
+
+  return sessions.sort(
+    (a, b) => new Date(b.endedAt).getTime() - new Date(a.endedAt).getTime()
+  );
+}
--- a/src/styles.css
+++ b/src/styles.css
@@ -0,0 +1,462 @@
+:root {
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+    color: #f5f5f5;
+    background-color: #05060a;
+}
+
+*,
+*::before,
+*::after {
+    box-sizing: border-box;
+}
+
+body,
+html,
+#root {
+    margin: 0;
+    padding: 0;
+    height: 100%;
+}
+
+/* MAIN SCREEN LAYOUT */
+
+.screen {
+    width: 100%;
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+
+    background: radial-gradient(circle at top left, #1b2140, #05060a 55%);
+    padding: 4px 16px 8px;
+    gap: 8px;
+
+    /* whole screen scrolls */
+    overflow-y: auto;
+    -webkit-overflow-scrolling: touch;
+}
+
+.top-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-top: 2px;
+    /* small tweak */
+}
+
+.top-bar-left {
+    display: flex;
+    flex-direction: column;
+}
+
+.brand {
+    font-size: 1.4rem;
+    font-weight: 600;
+}
+
+.subtitle {
+    font-size: 0.85rem;
+    color: #b0b4c3;
+}
+
+.top-bar-right {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    font-size: 0.9rem;
+}
+
+.status-dot {
+    width: 10px;
+    height: 10px;
+    border-radius: 999px;
+    background: #34c759;
+}
+
+.status-label {
+    color: #b0b4c3;
+}
+
+.center-message {
+    flex: 1;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 1rem;
+    color: #e5e5ea;
+}
+
+.center-message.error {
+    color: #ff453a;
+}
+
+/* CONTENT AREA – just layout, NO own scrolling now */
+
+.content {
+    display: grid;
+    grid-template-rows: auto auto minmax(0, 1fr);
+    gap: 10px;
+
+    /* small extra space above nav */
+    padding-bottom: 12px;
+}
+
+/* PANELS */
+
+.panel {
+    background: rgba(9, 11, 22, 0.9);
+    border-radius: 16px;
+    padding: 12px 14px;
+    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
+}
+
+.panel-header {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    margin-bottom: 8px;
+}
+
+.panel-header h2 {
+    font-size: 1rem;
+    margin: 0;
+}
+
+.panel-subtitle {
+    font-size: 0.8rem;
+    color: #a2a6b8;
+}
+
+.panel-main {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+/* CURRENT SOH SECTION */
+
+.current-soh-row {
+    display: flex;
+    justify-content: space-between;
+    gap: 12px;
+}
+
+.current-soh-value {
+    flex: 1;
+}
+
+.current-soh-value .value {
+    display: block;
+    font-size: 2.2rem;
+    font-weight: 600;
+}
+
+.soh-change {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+}
+
+.summary-row {
+    display: flex;
+    gap: 12px;
+}
+
+.summary-item {
+    flex: 1;
+}
+
+.label {
+    display: block;
+    font-size: 0.75rem;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    color: #a2a6b8;
+}
+
+.value {
+    display: block;
+    font-size: 1rem;
+    font-weight: 500;
+}
+
+.secondary {
+    display: block;
+    font-size: 0.8rem;
+    color: #8a8ea0;
+}
+
+.delta-tag {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    padding: 3px 8px;
+    border-radius: 999px;
+    font-size: 0.8rem;
+    font-weight: 500;
+    background: #2c2f3e;
+}
+
+.delta-tag.small {
+    font-size: 0.75rem;
+    padding: 2px 6px;
+}
+
+.delta-up {
+    color: #34c759;
+}
+
+.delta-down {
+    color: #ff453a;
+}
+
+.delta-flat {
+    color: #f5f5f5;
+}
+
+/* Chart */
+
+.panel-chart {
+    display: flex;
+    flex-direction: column;
+}
+
+.chart-wrapper {
+    position: relative;
+    width: 100%;
+    height: 80px;
+}
+
+.chart-svg {
+    width: 100%;
+    height: 100%;
+}
+
+.chart-line {
+    stroke: #4da6ff;
+    stroke-width: 0.8;
+}
+
+.chart-dot {
+    fill: #ffffff;
+}
+
+.chart-placeholder {
+    font-size: 0.9rem;
+    color: #a2a6b8;
+}
+
+.chart-labels {
+    display: flex;
+    justify-content: space-between;
+    margin-top: 4px;
+    font-size: 0.7rem;
+    color: #a2a6b8;
+}
+
+/* Session list */
+
+.panel-list {
+    display: flex;
+    flex-direction: column;
+    min-height: 0;
+}
+
+/* IMPORTANT: remove its own scrolling, let whole screen handle it */
+.session-list {
+    margin-top: 6px;
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    padding-right: 4px;
+}
+
+.session-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 6px 8px;
+    border-radius: 10px;
+    background: rgba(17, 20, 36, 0.9);
+}
+
+.session-main {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+}
+
+.session-title {
+    font-size: 0.9rem;
+    font-weight: 500;
+}
+
+.session-subtitle {
+    font-size: 0.8rem;
+    color: #a2a6b8;
+}
+
+.session-metrics {
+    display: flex;
+    gap: 10px;
+    align-items: center;
+}
+
+.session-metric {
+    text-align: right;
+}
+
+/* STATUS BAR */
+
+.status-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 2px 4px 4px;
+    font-size: 0.8rem;
+    color: #cfd2e1;
+    opacity: 0.9;
+}
+
+.status-left,
+.status-center,
+.status-right {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.status-time {
+    font-weight: 500;
+}
+
+.status-temp {
+    padding: 2px 6px;
+    border-radius: 999px;
+    background: rgba(255, 255, 255, 0.06);
+}
+
+.status-car {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 2px 8px;
+    border-radius: 999px;
+    background: rgba(0, 0, 0, 0.35);
+    font-size: 0.82rem;
+}
+
+.status-car-range {
+    font-weight: 500;
+}
+
+.status-icon {
+    opacity: 0.9;
+}
+
+/* QUICK STRIP */
+
+.quick-strip {
+    display: flex;
+    gap: 8px;
+    margin-bottom: 2px;
+}
+
+.quick-btn {
+    flex: 1;
+    border: none;
+    border-radius: 999px;
+    padding: 4px 8px;
+    background: rgba(21, 24, 40, 0.9);
+    color: #e7e9f5;
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 0.8rem;
+}
+
+.quick-btn-active {
+    background: linear-gradient(120deg, #2bcbff, #5e72eb);
+}
+
+.quick-icon {
+    font-size: 1rem;
+}
+
+.quick-label {
+    white-space: nowrap;
+}
+
+/* BOTTOM NAV – fixed overlay inside the car screen */
+
+.bottom-nav {
+    position: sticky;
+    bottom: 0;
+
+    display: flex;
+    justify-content: space-around;
+    align-items: center;
+    padding-top: 6px;
+    padding-bottom: 6px;
+    margin-top: 4px;
+
+    border-top: 1px solid rgba(255, 255, 255, 0.06);
+
+    border-radius: 16px;
+
+    background: rgba(5, 6, 10, 0.95)
+}
+
+.nav-button {
+    flex: 1;
+    border: none;
+    background: transparent;
+    color: #8c90a4;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 2px;
+    font-size: 0.75rem;
+    padding: 4px 0;
+}
+
+.nav-icon {
+    font-size: 1.1rem;
+}
+
+.nav-button-active {
+    color: #ffffff;
+    font-weight: 500;
+}
+
+.nav-button-active .nav-icon {
+    transform: translateY(-1px);
+}
+
+/* INFOTAINMENT VIEWPORT – fixed 21:9 ratio */
+#viewport-wrapper {
+    width: 100vw;
+    height: 100vh;
+    background: #000;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+#viewport {
+    aspect-ratio: 21 / 9;
+    width: min(90vw, 1600px);
+    max-height: 90vh;
+    border-radius: 20px;
+    background: #05060a;
+    overflow: hidden;
+    display: flex;
+    box-shadow:
+        0 0 40px rgba(0, 0, 0, 0.6),
+        0 0 0 8px #111;
+}
+
+#root {
+    width: 100%;
+    height: 100%;
+}
--- a/src/types.ts
+++ b/src/types.ts
@@ -0,0 +1,16 @@
+export interface ChargingSession {
+  id: string;
+  startedAt: string; // ISO timestamp
+  endedAt: string; // ISO timestamp
+  sohStart: number; // e.g. 94.3 (%)
+  sohEnd: number; // e.g. 94.1 (%)
+  socStart?: number; // %
+  socEnd?: number; // %
+  energyAddedKWh?: number;
+  avgTempC?: number;
+  locationName?: string;
+}
+
+export interface SessionsResponse {
+  sessions: ChargingSession[];
+}
--- a/tsconfig.app.json
+++ b/tsconfig.app.json
@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2022",
+    "useDefineForClassFields": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "types": ["vite/client"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["src"]
+}
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["vite.config.ts"]
+}
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})
				`@@ -0,0 +1 @@`
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