# Booking Page Documentation

## 📚 Overview

This folder contains comprehensive documentation for the WeChat Mini-Program booking system in the mp-pilates project (Uni-app + Vue 3).

### 📄 Documentation Files

1. **BOOKING_PAGE_ANALYSIS.md** ⭐ START HERE
   - Complete file-by-file breakdown of all components
   - Data flow diagrams
   - API contract documentation
   - Color scheme and styling details
   - Potential issues and problems

2. **COMPONENT_HIERARCHY.md**
   - Visual component tree structure
   - State management flow (Pinia stores)
   - API sequence diagrams
   - State machine for slot cards
   - Data transformations

3. **QUICK_REFERENCE.md**
   - Code snippets for quick lookup
   - Debugging tips and console commands
   - Common issues and solutions
   - Debugging checklist
   - API examples

---

## 🎯 Quick Navigation

### I want to understand...

**...the overall flow**
→ Read: BOOKING_PAGE_ANALYSIS.md → "Complete Data Flow Diagram" section

**...how the UI is structured**
→ Read: COMPONENT_HIERARCHY.md → "Component Tree" + "UI Layout Breakdown"

**...where specific code is**
→ Read: QUICK_REFERENCE.md → "Finding Specific Things"

**...how to debug an issue**
→ Read: QUICK_REFERENCE.md → "Common Issues & Solutions"

**...the API contracts**
→ Read: QUICK_REFERENCE.md → "API Contract Summary"

**...the store state**
→ Read: COMPONENT_HIERARCHY.md → "State Management Flow"

---

## 🏗️ Project Structure

```
packages/app/src/
├── pages/
│   └── booking/
│       └── index.vue                    # Main booking page (311 lines)
├── components/
│   ├── DateSelector.vue                 # Date picker (50 lines)
│   ├── TimePeriodFilter.vue             # Time period filter (50 lines)
│   ├── SlotCard.vue                     # Individual slot card (230 lines)
│   └── BookingConfirmPopup.vue          # Booking confirmation modal (430 lines)
├── stores/
│   ├── booking.ts                       # Booking state (72 lines)
│   └── user.ts                          # User/membership state (110 lines)
└── utils/
    ├── request.ts                       # API request utilities (80 lines)
    └── format.ts                        # Date formatting utilities (50 lines)

packages/shared/src/
├── types/
│   ├── time-slot.ts                     # TimeSlot types
│   ├── api.ts                           # API response types
│   └── booking.ts                       # Booking types
├── constants.ts                          # TIME_PERIODS, etc
└── enums.ts                              # Enums (TimeSlotStatus, etc)
```

---

## 🔄 Data Flow at a Glance

```
Page Load
  ↓
[Check login + load memberships]
  ↓
Store: fetchSlots(today)
  ↓
API: GET /time-slot/available?date=TODAY
  ↓
State: bookingStore.slots = [TimeSlotWithBookingStatus[], ...]
  ↓
Computed: filteredSlots (optionally filtered by period)
  ↓
Render: SlotCard components
  ↓
User interaction:
  - Tap date → loadSlots(newDate)
  - Filter period → filteredSlots re-computed
  - Book slot → onBookTap() → popup
  - Confirm → createBooking() → refresh slots
  - Cancel → cancelBooking() → refresh slots
```

---

## 🎭 Key Components

### 1. pages/booking/index.vue
**Role:** Main page that orchestrates everything
**State:** selectedDate, selectedPeriod, showConfirmPopup, pendingSlot
**Stores:** bookingStore, userStore
**Key computed:** scrollHeight, filteredSlots

### 2. components/SlotCard.vue
**Role:** Displays individual time slot
**Props:** slot (TimeSlotWithBookingStatus)
**Emits:** book, cancel
**States:** 4 button states based on status + isBookedByMe

### 3. components/DateSelector.vue
**Role:** Horizontal date picker
**Props:** modelValue (YYYY-MM-DD)
**Data:** dateRange (7 days from today)
**Display:** Shows weekday, day number, month

### 4. components/TimePeriodFilter.vue
**Role:** Horizontal tab filter
**Props:** modelValue (MORNING|AFTERNOON|EVENING|null)
**Constants:** TIME_PERIODS from shared

### 5. components/BookingConfirmPopup.vue
**Role:** Modal for confirming booking
**Props:** visible, slot, memberships
**State:** selectedMembershipId (auto-selected on show)
**Logic:** Auto-select first membership when popup opens

### 6. stores/booking.ts
**Actions:**
- fetchSlots(date) → GET /time-slot/available?date=
- createBooking(dto) → POST /booking
- cancelBooking(bookingId) → PUT /booking/:id/cancel
- fetchMyBookings(status?) → GET /booking/my
- fetchUpcomingBookings() → GET /booking/my/upcoming

### 7. stores/user.ts
**Computed:**
- loggedIn: !!token.value
- hasValidMembership: activeMemberships.length > 0
- activeMemberships: memberships filtered by ACTIVE status

---

## 📊 State Types

### TimeSlotWithBookingStatus
```typescript
{
  id: string                    // UUID
  date: "2026-04-05"           // YYYY-MM-DD
  startTime: "09:00"           // HH:MM
  endTime: "10:00"             // HH:MM
  capacity: 1                  // Max slots
  bookedCount: 0               // Currently booked
  status: "OPEN" | "FULL" | "CLOSED"
  source: "MANUAL" | "TEMPLATE"
  templateId: null
  isBookedByMe: boolean        // User has booked this
  myBookingId: string | null   // Booking ID (for cancel)
}
```

### MembershipWithCardType
```typescript
{
  id: string
  cardType: { name: string, ... }
  status: "ACTIVE" | "EXPIRED" | "USED_UP"
  remainingTimes: number | null
  expireDate: "2026-12-31"
}
```

---

## 🎨 Visual States

### Slot Card Button States

| Condition | Button | Color | Action |
|-----------|--------|-------|--------|
| OPEN, not booked | "可预约" | Tan (#c9a87c) | Show popup |
| OPEN, booked by me | "已预约" + "取消" link | Tan + Red | Show cancel confirm |
| FULL | "已约满" | Gray (#f0f0f0) | Disabled |
| CLOSED | "已关闭" | Gray (#f0f0f0) | Disabled |

### Capacity Badge Colors

| Condition | Background | Text | Meaning |
|-----------|------------|------|---------|
| <80% booked | #f0faf3 | #4caf50 | Green - Plenty of spots |
| ≥80% booked | #fff8ed | #f59e0b | Orange - Almost full |
| FULL | #fef0f0 | #ef4444 | Red - No spots |
| CLOSED | #f5f5f5 | #999 | Gray - Unavailable |

---

## 🔐 Authentication

- Token stored in localStorage
- Automatically included in request headers
- 401 response → Clear token + show "please login" toast
- onBookTap checks loggedIn → shows login modal if needed
- onBookTap checks hasValidMembership → shows purchase modal if needed

---

## 📡 API Endpoints

### GET /time-slot/available?date=YYYY-MM-DD
```
Query: date (required, YYYY-MM-DD format)
Returns: TimeSlotWithBookingStatus[]
Auth: Bearer token required
```

### POST /booking
```
Body: { timeSlotId, membershipId }
Returns: BookingWithDetails
Auth: Bearer token required
```

### PUT /booking/:bookingId/cancel
```
Path: bookingId
Returns: BookingWithDetails (with status: CANCELLED)
Auth: Bearer token required
```

### GET /membership/my
```
Returns: MembershipWithCardType[]
Auth: Bearer token required
```

---

## ⚠️ Known Issues

### 1. GET Request Body Issue
- File: `utils/request.ts`, `get()` function
- Problem: Data passed as body instead of query params
- Impact: Might not work on all platforms

### 2. Error Handling
- File: `stores/booking.ts`, `fetchSlots()`
- Problem: Network error → empty array instead of error message
- Impact: Users can't tell if error or truly no slots

### 3. Loading State
- File: `pages/booking/index.vue`
- Problem: Skeleton only appears on initial load
- Impact: Date changes appear instant (confusing on slow network)

### 4. Date Math
- File: `utils/format.ts`, `getDateRange()`
- Problem: Uses ms arithmetic (86400000ms per day)
- Impact: Doesn't account for DST transitions

---

## 🧪 Testing Checklist

### Happy Path
- [ ] Load page → today's slots display
- [ ] Tap date → slots change for that date
- [ ] Filter by period → slots filtered correctly
- [ ] Tap "可预约" → popup shows
- [ ] Confirm booking → slot shows "已预约"
- [ ] Tap "取消" → booking cancelled, slot resets
- [ ] Pull to refresh → slots reload

### Edge Cases
- [ ] No slots for date → empty state appears
- [ ] Not logged in → login modal on book tap
- [ ] No valid membership → purchase modal on book tap
- [ ] Network error → ??? (currently shows empty)
- [ ] Slot becomes FULL → button updates to disabled
- [ ] Multiple memberships → can select different card

---

## 📝 File Sizes

| File | Lines | Purpose |
|------|-------|---------|
| pages/booking/index.vue | 311 | Main page orchestration |
| components/BookingConfirmPopup.vue | 430 | Booking modal |
| components/SlotCard.vue | 230 | Slot display |
| stores/booking.ts | 72 | Booking state |
| utils/request.ts | 80 | API client |
| components/DateSelector.vue | 50 | Date picker |
| components/TimePeriodFilter.vue | 50 | Period filter |
| utils/format.ts | 50 | Date utilities |

---

## 🎓 Learning Path

**Level 1: Overview**
1. Read this file
2. Look at BOOKING_PAGE_ANALYSIS.md → "Complete Data Flow Diagram"

**Level 2: Components**
1. Read COMPONENT_HIERARCHY.md → "Component Tree"
2. Read BOOKING_PAGE_ANALYSIS.md → "File-by-File Analysis"

**Level 3: Implementation**
1. Read QUICK_REFERENCE.md → "Where Slots Come From"
2. Read actual source files in order:
   - stores/booking.ts
   - pages/booking/index.vue
   - components/SlotCard.vue
   - components/BookingConfirmPopup.vue

**Level 4: Debugging**
1. Read QUICK_REFERENCE.md → "Debugging Tips"
2. Read QUICK_REFERENCE.md → "Common Issues & Solutions"

**Level 5: Deep Dive**
1. Read COMPONENT_HIERARCHY.md → "State Management Flow"
2. Read COMPONENT_HIERARCHY.md → "API Calls Sequence"
3. Study utils/request.ts for request handling

---

## 🔗 Related Documentation

- Backend: `/packages/server/src/time-slot/` 
- Shared types: `/packages/shared/src/types/`
- Auth: `/packages/app/src/utils/auth.ts`
- User store: `/packages/app/src/stores/user.ts`

---

## 📞 Quick Answers

**Q: Why doesn't the page load?**
A: Check 1) Is API returning data? 2) Is token valid? 3) Check console for errors

**Q: Why doesn't filtering work?**
A: Check 1) Is selectedPeriod.value being set? 2) Is slot.startTime correct format?

**Q: Why doesn't the booking button work?**
A: Check 1) Is slot.status === OPEN? 2) Is isBookedByMe === false? 3) Is user logged in?

**Q: How do I add error handling?**
A: See QUICK_REFERENCE.md → "Issue 1: Slots not loading" → Solution

**Q: How do I test the booking flow?**
A: See "Testing Checklist" section above

---

## 🚀 Common Tasks

### Add loading indicator during date change
→ Use bookingStore.loadingSlots in template

### Show error message for API failures
→ Add error state to bookingStore, show in template

### Change colors/styling
→ Edit style blocks in .vue files (see color scheme in BOOKING_PAGE_ANALYSIS.md)

### Modify time period ranges
→ Edit TIME_PERIODS in packages/shared/src/constants.ts

### Change initial date or time range
→ Edit pages/booking/index.vue onMounted() or DATE_SELECTOR_DAYS constant

### Add/remove date selector days
→ Edit DATE_SELECTOR_DAYS in packages/shared/src/constants.ts

---

Generated: 2026-04-05
Last Updated: BOOKING_PAGE_ANALYSIS.md