# Plan: Bottom Navigation Bar & Global Header Restructure

## Overview

Restructure the GreenHomeUI app to have an Android-style layout with:
- A **persistent Bottom Navigation Bar** (4 tabs: Profile, Alerts, Report, Weather)
- A **global Top Header** showing device title, page title with icon, and page info
- Applied to all authenticated pages (after device selection)

---

## Current Architecture

```
App Flow:
  / (login) → /verify-code → /devices → /daily-report?deviceId=X&date=Y
                                            ├── /alert-settings?deviceId=X
                                            ├── /calendar?deviceId=X
                                            ├── /day-details?deviceId=X&year=Y&month=Z
                                            └── /device-settings?deviceId=X
```

Each page currently has its own `PageHeader` and manages its own layout independently. There is no shared shell/layout for authenticated pages.

---

## Target Architecture

```
Authenticated Shell (Layout)
┌──────────────────────────────────┐
│         Top Header               │
│  [Device Name]  [Page Icon+Title]│
│  [Page-specific info]            │
├──────────────────────────────────┤
│                                  │
│       Page Content               │
│       (children)                 │
│                                  │
├──────────────────────────────────┤
│  [Profile] [Alerts] [Report] [W] │
│       Bottom Navigation Bar      │
└──────────────────────────────────┘
```

### Route Mapping

| Bottom Nav Tab | Route | Page Component | Icon |
|---|---|---|---|
| Profile | `/profile?deviceId=X` | New `src/app/profile/page.tsx` | `User` |
| Alerts | `/alert-settings?deviceId=X` | Existing (refactored) | `Bell` |
| Report | `/daily-report?deviceId=X&date=Y` | Existing (refactored) | `BarChart3` |
| Weather | `/weather?deviceId=X` | New `src/app/weather/page.tsx` | `CloudSun` |

### Pages OUTSIDE the shell (no bottom nav/header):
- `/` (login page)
- `/login`
- `/verify-code`
- `/devices` (device selection - this is the gateway before entering the shell)

### Pages INSIDE the shell (with bottom nav + header):
- `/daily-report` (Report tab)
- `/alert-settings` (Alerts tab)
- `/profile` (Profile tab - NEW)
- `/weather` (Weather tab - NEW)
- `/calendar` (calendar navigation)
- `/day-details` (day detail view)
- `/device-settings` (device configuration)

---

## Component Architecture

### 1. [`src/components/layout/AppShell.tsx`](src/components/layout/AppShell.tsx) — NEW
The main layout wrapper for authenticated pages. Provides:
- Top header bar
- Bottom navigation bar
- Main content area (children)

### 2. [`src/components/layout/TopHeader.tsx`](src/components/layout/TopHeader.tsx) — NEW
Global top header component showing:
- **Left side**: Device name (from context/query param)
- **Center/Right**: Page title with icon
- **Optional**: Page-specific info (e.g., selected date for daily-report)

Props:
```typescript
type TopHeaderProps = {
  deviceName: string
  pageTitle: string
  pageIcon: LucideIcon
  pageInfo?: string  // e.g., "۱۴۰۴/۰۲/۲۱" for date
  iconGradient?: string
}
```

### 3. [`src/components/layout/BottomNav.tsx`](src/components/layout/BottomNav.tsx) — NEW
Bottom navigation bar with 4 tabs:
- Uses `lucide-react` icons
- Highlights active tab based on current route
- Fixed at bottom, safe-area aware for notched devices
- Each tab navigates via `next/navigation` `useRouter`

### 4. [`src/components/layout/DeviceProvider.tsx`](src/components/layout/DeviceProvider.tsx) — NEW
React Context provider that stores the currently selected `deviceId` and `deviceName` so all pages within the shell can access them without passing through query params everywhere.

### 5. [`src/app/profile/page.tsx`](src/app/profile/page.tsx) — NEW
User profile page showing:
- User name, family, mobile
- Logout button
- Link to device settings

### 6. [`src/app/weather/page.tsx`](src/app/weather/page.tsx) — NEW
Dedicated weather page (extracted from the weather tab inside daily-report):
- Shows forecast weather data
- Reuses existing [`WeatherTab`](src/components/daily-report/WeatherTab.tsx) or creates a standalone version

---

## Data Flow

```
User logs in → /devices (selects device)
  → Stores deviceId + deviceName in DeviceProvider context
  → Redirects to /daily-report?deviceId=X&date=today
  → AppShell renders with TopHeader + BottomNav + page content
  → BottomNav tab changes update the route
  → DeviceProvider persists across tab switches
```

### DeviceProvider Context

```typescript
type DeviceContextType = {
  deviceId: number
  deviceName: string
  setDevice: (id: number, name: string) => void
}
```

The provider wraps all authenticated pages. When a user selects a device on `/devices`, it sets the context. The `AppShell` reads from this context to display the device name in the header.

---

## File Changes Summary

### New Files to Create

| File | Purpose |
|---|---|
| [`src/components/layout/AppShell.tsx`](src/components/layout/AppShell.tsx) | Main layout shell with header + bottom nav |
| [`src/components/layout/TopHeader.tsx`](src/components/layout/TopHeader.tsx) | Global top header component |
| [`src/components/layout/BottomNav.tsx`](src/components/layout/BottomNav.tsx) | Bottom navigation bar |
| [`src/components/layout/DeviceProvider.tsx`](src/components/layout/DeviceProvider.tsx) | Device context provider |
| [`src/components/layout/index.ts`](src/components/layout/index.ts) | Barrel exports |
| [`src/app/profile/page.tsx`](src/app/profile/page.tsx) | Profile page |
| [`src/app/weather/page.tsx`](src/app/weather/page.tsx) | Weather page |

### Files to Modify

| File | Changes |
|---|---|
| [`src/app/layout.tsx`](src/app/layout.tsx) | Wrap children with `DeviceProvider` for authenticated routes |
| [`src/app/daily-report/page.tsx`](src/app/daily-report/page.tsx) | Remove standalone `PageHeader`, use `AppShell` instead. Remove `BackLink`. |
| [`src/app/alert-settings/page.tsx`](src/app/alert-settings/page.tsx) | Remove standalone `PageHeader`, use `AppShell`. Remove `BackLink`. |
| [`src/app/calendar/page.tsx`](src/app/calendar/page.tsx) | Remove standalone `PageHeader`, use `AppShell`. Remove `BackLink`. |
| [`src/app/day-details/page.tsx`](src/app/day-details/page.tsx) | Remove standalone `PageHeader`, use `AppShell`. Remove `BackLink`. |
| [`src/app/device-settings/page.tsx`](src/app/device-settings/page.tsx) | Remove standalone `PageHeader`, use `AppShell`. Remove `BackLink`. |
| [`src/app/devices/page.tsx`](src/app/devices/page.tsx) | After device selection, set `DeviceProvider` context before redirecting |
| [`src/app/globals.css`](src/app/globals.css) | Add styles for bottom nav (safe-area padding, fixed positioning) |

---

## Implementation Steps (Ordered)

### Step 1: Create Layout Components
- Create [`DeviceProvider`](src/components/layout/DeviceProvider.tsx) context
- Create [`TopHeader`](src/components/layout/TopHeader.tsx) component
- Create [`BottomNav`](src/components/layout/BottomNav.tsx) component
- Create [`AppShell`](src/components/layout/AppShell.tsx) that composes them
- Create barrel export [`index.ts`](src/components/layout/index.ts)

### Step 2: Update Root Layout
- Modify [`src/app/layout.tsx`](src/app/layout.tsx) to wrap with `DeviceProvider`
- Add bottom nav CSS to [`src/app/globals.css`](src/app/globals.css)

### Step 3: Create New Pages
- Create [`src/app/profile/page.tsx`](src/app/profile/page.tsx) — user info + logout
- Create [`src/app/weather/page.tsx`](src/app/weather/page.tsx) — dedicated weather page

### Step 4: Refactor Existing Pages to Use AppShell
- [`src/app/daily-report/page.tsx`](src/app/daily-report/page.tsx) — remove standalone PageHeader, wrap content in AppShell
- [`src/app/alert-settings/page.tsx`](src/app/alert-settings/page.tsx) — same
- [`src/app/calendar/page.tsx`](src/app/calendar/page.tsx) — same
- [`src/app/day-details/page.tsx`](src/app/day-details/page.tsx) — same
- [`src/app/device-settings/page.tsx`](src/app/device-settings/page.tsx) — same

### Step 5: Update Device Selection Flow
- Modify [`src/app/devices/page.tsx`](src/app/devices/page.tsx) to set device context on selection
- Ensure single-device auto-redirect also sets context

### Step 6: Polish & Testing
- Ensure bottom nav highlights correct tab based on route
- Ensure safe-area padding for notched phones
- Test navigation between all tabs
- Verify header shows correct device name and page info

---

## Mermaid Diagram: Component Tree

```mermaid
flowchart TD
    RootLayout[RootLayout] --> DeviceProvider[DeviceProvider]
    DeviceProvider --> AuthPages[Auth Pages Group]
    
    subgraph AuthPages[Authenticated Pages]
        AppShell[AppShell] --> TopHeader[TopHeader]
        AppShell --> PageContent[Page Content]
        AppShell --> BottomNav[BottomNav]
        
        PageContent --> DailyReport[/daily-report]
        PageContent --> AlertSettings[/alert-settings]
        PageContent --> Profile[/profile]
        PageContent --> Weather[/weather]
        PageContent --> Calendar[/calendar]
        PageContent --> DayDetails[/day-details]
        PageContent --> DeviceSettings[/device-settings]
    end
    
    NonAuth[Non-Auth Pages] -.-> Login[/login]
    NonAuth -.-> VerifyCode[/verify-code]
    NonAuth -.-> Devices[/devices]
    
    Devices -.->|select device| AppShell
```

## Mermaid Diagram: Navigation Flow

```mermaid
flowchart LR
    Login[/login] --> Verify[/verify-code]
    Verify --> Devices[/devices]
    Devices -->|select device + set context| DailyReport[/daily-report<br/>Tab: Report]
    
    DailyReport -->|BottomNav: Alerts| AlertSettings[/alert-settings<br/>Tab: Alerts]
    DailyReport -->|BottomNav: Profile| Profile[/profile<br/>Tab: Profile]
    DailyReport -->|BottomNav: Weather| Weather[/weather<br/>Tab: Weather]
    
    AlertSettings -->|BottomNav: Report| DailyReport
    AlertSettings -->|BottomNav: Profile| Profile
    AlertSettings -->|BottomNav: Weather| Weather
    
    Profile -->|BottomNav: Report| DailyReport
    Profile -->|BottomNav: Alerts| AlertSettings
    Profile -->|BottomNav: Weather| Weather
    
    Weather -->|BottomNav: Report| DailyReport
    Weather -->|BottomNav: Alerts| AlertSettings
    Weather -->|BottomNav: Profile| Profile
    
    DailyReport -->|internal link| Calendar[/calendar]
    Calendar -->|select day| DayDetails[/day-details]
    DayDetails -->|select date| DailyReport
    
    DailyReport -->|settings icon| DeviceSettings[/device-settings]
    Profile -->|settings link| DeviceSettings
```

---

## Key Design Decisions

1. **DeviceProvider Context**: Rather than passing `deviceId` as a query param on every navigation, we use React Context. This simplifies all page components and makes the header always aware of the current device.

2. **AppShell as a wrapper**: Each page inside the shell imports `AppShell` and wraps its content. The shell provides the header and bottom nav. This keeps pages clean and focused on their content.

3. **BottomNav uses route matching**: The active tab is determined by matching `usePathname()` against known routes. This is simpler than managing state across pages.

4. **Safe-area handling**: The bottom nav uses `env(safe-area-inset-bottom)` CSS to avoid overlapping with system navigation bars on notched devices.

5. **Existing PageHeader component**: The existing `PageHeader` component can still be used inside page content if needed (e.g., for sub-headers within a page), but the main header is now provided by `AppShell`.