# Data Model: McDonald's IT Halloween Event Page

**Feature**: Halloween event announcement webpage
**Date**: 2025-10-04
**Status**: Complete

## Overview

This document defines the data entities and their relationships for the Halloween event page. While this is a static page with no backend storage, defining the data model helps structure the HTML content and JavaScript logic.

## Entities

### 1. Event

Represents the Halloween event information.

**Purpose**: Store and display all event details

**Fields**:
| Field | Type | Required | Default | Description |
|-------|------|----------|---------|-------------|
| `title` | String | Yes | - | Event title: "2025 MITA Halloween" |
| `date` | Date | Yes | - | Event date: October 31, 2025 |
| `startTime` | Time | Yes | - | Event start: 18:00 GMT+8 |
| `endTime` | Time | Yes | - | Event end: 21:00 GMT+8 |
| `timezone` | String | Yes | "GMT+8" | Timezone for event |
| `location` | String | Yes | - | "MITA Building 2F Pantry" |
| `organizer` | Object | Yes | - | Organizer details |
| `organizer.name` | String | Yes | - | "Jessi Pan" |
| `organizer.email` | String | Yes | - | "jessi.pan@cn.mcd.com" |
| `activities` | Array<String> | Yes | - | List of activities |
| `notes` | Array<String> | Yes | - | Additional information |

**Validation Rules**:
- `date` must be valid ISO date format
- `startTime` must be before `endTime`
- Times must be in 24-hour format (HH:MM)
- `organizer.email` must be valid email format
- `activities` must contain at least 1 item

**Example**:
```json
{
  "title": "2025 MITA Halloween",
  "date": "2025-10-31",
  "startTime": "18:00",
  "endTime": "21:00",
  "timezone": "GMT+8",
  "location": "MITA Building 2F Pantry",
  "organizer": {
    "name": "Jessi Pan",
    "email": "jessi.pan@cn.mcd.com"
  },
  "activities": [
    "Cosplay (encouraged)",
    "Bug Debugging Games",
    "Lucky Draw"
  ],
  "notes": [
    "Costumes encouraged",
    "Food and drinks provided"
  ]
}
```

**State Transitions**: None (static data)

---

### 2. Countdown

Represents the countdown timer state and logic.

**Purpose**: Calculate and display time remaining until event

**Fields**:
| Field | Type | Required | Default | Description |
|-------|------|----------|---------|-------------|
| `targetDateTime` | DateTime | Yes | - | Oct 31 2025 18:00:00 GMT+8 (in UTC: 10:00:00 UTC) |
| `currentDateTime` | DateTime | Yes | - | User's current time (updated every second) |
| `timeRemaining` | Object | No | null | Calculated time remaining |
| `timeRemaining.days` | Integer | No | 0 | Days remaining |
| `timeRemaining.hours` | Integer | No | 0 | Hours remaining (0-23) |
| `timeRemaining.minutes` | Integer | No | 0 | Minutes remaining (0-59) |
| `timeRemaining.seconds` | Integer | No | 0 | Seconds remaining (0-59) |
| `status` | Enum | Yes | "before" | Current event status |

**Status Values**:
- `before`: Current time is before event start (show countdown)
- `active`: Event has started, current time is between start and end (show "EVENT STARTING NOW!")
- `ended`: Event has ended, current time is after event end (show "EVENT COMPLETED")

**Validation Rules**:
- `targetDateTime` must be a valid Date object
- All time values must be >= 0
- `status` must be one of: "before", "active", "ended"
- `timeRemaining` is null when status is not "before"

**Calculation Logic**:
```javascript
// Convert GMT+8 to UTC for calculation
// Oct 31 2025 18:00 GMT+8 = Oct 31 2025 10:00 UTC
const targetDate = new Date('2025-10-31T10:00:00Z');
const eventEnd = new Date('2025-10-31T13:00:00Z'); // 21:00 GMT+8

function updateCountdown() {
  const now = new Date();

  if (now >= eventEnd) {
    return { status: 'ended', timeRemaining: null };
  }

  if (now >= targetDate) {
    return { status: 'active', timeRemaining: null };
  }

  const diff = targetDate - now;
  const days = Math.floor(diff / (1000 * 60 * 60 * 24));
  const hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  const minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
  const seconds = Math.floor((diff % (1000 * 60)) / 1000);

  return {
    status: 'before',
    timeRemaining: { days, hours, minutes, seconds }
  };
}
```

**State Transitions**:
```
before → active (when current time >= targetDateTime)
active → ended (when current time >= eventEnd)
```

---

### 3. VisualTheme

Represents the visual design configuration.

**Purpose**: Define and apply consistent styling across the page

**Fields**:
| Field | Type | Required | Default | Description |
|-------|------|----------|---------|-------------|
| `backgroundColor` | Color | Yes | "#000000" | Pure black background |
| `primaryColor` | Color | Yes | "#00FF00" | Terminal green for main text |
| `accentColor` | Color | Yes | "#FFBF00" | Amber for key information |
| `fontFamily` | String | Yes | See below | Monospace font stack |
| `fontSize` | Object | Yes | - | Font sizes for different elements |
| `fontSize.base` | String | Yes | "16px" | Base font size |
| `fontSize.heading` | String | Yes | "20px" | Heading size |
| `fontSize.small` | String | Yes | "14px" | Small text size |
| `asciiArt` | Object | Yes | - | ASCII art content |
| `asciiArt.logoDesktop` | String | Yes | - | McDonald's logo for desktop |
| `asciiArt.logoMobile` | String | Yes | - | McDonald's logo for mobile |
| `asciiArt.decorations` | Array<String> | Yes | - | Halloween ASCII decorations |

**Font Stack**:
```css
"Courier New", Monaco, Consolas, "Liberation Mono", Menlo, monospace
```

**Validation Rules**:
- All color values must be valid hex format (#RRGGBB)
- `backgroundColor` must be #000000 (black)
- `primaryColor` and `accentColor` must meet WCAG AA contrast ratio with background
- `fontFamily` must include at least one monospace fallback
- ASCII art strings must contain only ASCII characters (0-127)

**Example**:
```json
{
  "backgroundColor": "#000000",
  "primaryColor": "#00FF00",
  "accentColor": "#FFBF00",
  "fontFamily": "\"Courier New\", Monaco, Consolas, Menlo, monospace",
  "fontSize": {
    "base": "16px",
    "heading": "20px",
    "small": "14px"
  },
  "asciiArt": {
    "logoDesktop": "[Multi-line ASCII art]",
    "logoMobile": "[Simplified ASCII art]",
    "decorations": ["🎃", "👻", "🦇"]
  }
}
```

**State Transitions**: None (static configuration)

---

### 4. Content (Bilingual)

Represents bilingual text content structure.

**Purpose**: Store and display English/Chinese content pairs

**Fields**:
| Field | Type | Required | Default | Description |
|-------|------|----------|---------|-------------|
| `section` | String | Yes | - | Content section identifier |
| `english` | String | Yes | - | English text |
| `chinese` | String | Yes | - | Chinese text (Simplified) |
| `order` | Integer | Yes | - | Display order |

**Example Content Pairs**:
```json
[
  {
    "section": "date",
    "english": "Date: October 31, 2025",
    "chinese": "日期：2025年10月31日",
    "order": 1
  },
  {
    "section": "time",
    "english": "Time: 18:00 - 21:00 (6:00 PM - 9:00 PM)",
    "chinese": "时间：18:00 - 21:00",
    "order": 2
  },
  {
    "section": "location",
    "english": "Location: MITA Building 2F Pantry",
    "chinese": "地点：MITA大厦2楼茶水间",
    "order": 3
  },
  {
    "section": "organizer",
    "english": "Organizer: Jessi Pan (jessi.pan@cn.mcd.com)",
    "chinese": "组织者：Jessi Pan (jessi.pan@cn.mcd.com)",
    "order": 4
  }
]
```

**Display Pattern**:
```html
<p lang="en">{english}</p>
<p lang="zh-CN">{chinese}</p>
```

---

## Relationships

```
Event (1)
  ├── has timezone (1) → Countdown
  └── has theme (1) → VisualTheme

Countdown (1)
  └── uses targetDateTime from Event

VisualTheme (1)
  └── styles all Content

Content (many)
  └── derived from Event
```

## HTML Representation

The data model maps to HTML structure as follows:

```html
<main>
  <!-- VisualTheme.asciiArt.logoDesktop -->
  <header>
    <pre class="ascii-desktop">[McDonald's ASCII Logo]</pre>
    <pre class="ascii-mobile">[McDonald's ASCII Logo Simplified]</pre>
    <p class="tagline">i'm lovin' IT<span class="cursor">_</span></p>
  </header>

  <!-- Countdown -->
  <section class="countdown">
    <div id="countdown-display">
      <span id="days">0</span>d
      <span id="hours">0</span>h
      <span id="minutes">0</span>m
      <span id="seconds">0</span>s
    </div>
  </section>

  <!-- Event + Content (bilingual) -->
  <section class="event-info">
    <p lang="en">Date: {Event.date}</p>
    <p lang="zh-CN">日期：{Event.date}</p>
    <!-- ... more bilingual pairs -->
  </section>

  <!-- Event.activities -->
  <section class="activities">
    <p lang="en">Activities:</p>
    <p lang="zh-CN">活动：</p>
    <ul>
      <li lang="en">{activity}</li>
      <li lang="zh-CN">{activity_zh}</li>
    </ul>
  </section>

  <!-- VisualTheme.asciiArt.decorations -->
  <section class="decorations">
    <pre>{decoration}</pre>
  </section>
</main>
```

## JavaScript Data Structure

```javascript
const eventData = {
  event: {
    title: "2025 MITA Halloween",
    date: "2025-10-31",
    startTime: "18:00",
    endTime: "21:00",
    timezone: "GMT+8",
    location: "MITA Building 2F Pantry",
    organizer: {
      name: "Jessi Pan",
      email: "jessi.pan@cn.mcd.com"
    },
    activities: ["Cosplay", "Bug Debugging Games", "Lucky Draw"],
    notes: ["Costumes encouraged", "Food and drinks provided"]
  },

  countdown: {
    targetDateTime: new Date('2025-10-31T10:00:00Z'), // GMT+8 = UTC+8
    eventEnd: new Date('2025-10-31T13:00:00Z'),
    status: 'before',
    timeRemaining: null
  },

  theme: {
    backgroundColor: "#000000",
    primaryColor: "#00FF00",
    accentColor: "#FFBF00",
    fontFamily: '"Courier New", Monaco, Consolas, Menlo, monospace'
  }
};
```

## Validation Contract

All data must conform to the schema defined in `/contracts/page-content.schema.json`.

See: [page-content.schema.json](./contracts/page-content.schema.json)

## Notes

- This is a static page, so data is hardcoded in HTML/JS
- No database or API calls required
- Data updates only via code changes
- Countdown is the only dynamic data (calculated client-side)

## Next Steps

- Create contracts/page-content.schema.json (JSON Schema validation)
- Create quickstart.md (testing checklist)
- Update CLAUDE.md (agent context)