# Avatar System

## Overview

Mii-style avatar system with full customization and level-based unlockable accessories. The system supports four rendering modes optimized for different game types, with smooth animations and real-time accessory rendering.

## Architecture

The avatar system consists of several modules:

| Module | File | Purpose |
|--------|------|---------|
| AvatarData | `avatarData.js` | Customization options and guest avatars |
| AvatarSystem | `avatarSystem.js` | Main API for creation, rendering, accessories |
| AvatarRenderer | `avatarRenderer.js` | Canvas 2D rendering engine |
| AvatarAnimations | `animations.js` | Animation definitions per mode |
| AvatarAccessories | `accessories.js` | Unlockable accessories catalog |
| AccessoryRenderer | `accessoryRenderer.js` | Accessory rendering on avatars |

---

## Customization Options

### Face Shape (8 options)

| ID | Name | Description |
|----|------|-------------|
| `round` | Round | Circular face with soft jawline |
| `oval` | Oval | Classic elongated oval shape |
| `square` | Square | Strong angular jawline |
| `heart` | Heart | Wide forehead, pointed chin |
| `long` | Long | Narrow, elongated face |
| `wide` | Wide | Broader face shape |
| `angular` | Angular | Defined cheekbones, sharp features |
| `soft` | Soft | Rounded features throughout |

### Skin Tone (20 options)

| ID | Name | Hex Code |
|----|------|----------|
| `fair1` | Porcelain | `#FFECD1` |
| `fair2` | Ivory | `#FFE4C4` |
| `fair3` | Peach | `#FFDAB9` |
| `fair4` | Cream | `#FFD5B5` |
| `light1` | Light Beige | `#F5D0A9` |
| `light2` | Warm Beige | `#E8C49A` |
| `light3` | Sand | `#DEB887` |
| `medium1` | Golden | `#D4A373` |
| `medium2` | Honey | `#C9A06A` |
| `medium3` | Caramel | `#BC8F5F` |
| `medium4` | Toffee | `#B07D4B` |
| `tan1` | Tan | `#A67B5B` |
| `tan2` | Bronze | `#996B4D` |
| `tan3` | Cinnamon | `#8B6D4C` |
| `brown1` | Chestnut | `#7D5A3C` |
| `brown2` | Cocoa | `#6F4E37` |
| `brown3` | Espresso | `#5D4532` |
| `dark1` | Mocha | `#4E3B2D` |
| `dark2` | Ebony | `#3D2B1F` |
| `dark3` | Onyx | `#2C1F15` |

### Eye Shape (12 options)

| ID | Name | Description |
|----|------|-------------|
| `round` | Round | Large, circular eyes |
| `almond` | Almond | Classic almond shape |
| `oval` | Oval | Soft oval shape |
| `narrow` | Narrow | Slim, elongated eyes |
| `wide` | Wide | Broad, expressive eyes |
| `droopy` | Droopy | Downturned outer corners |
| `upturned` | Upturned | Lifted outer corners |
| `cat` | Cat | Sharp upturned cat-eye |
| `sleepy` | Sleepy | Heavy-lidded, relaxed look |
| `surprised` | Surprised | Wide open, alert |
| `angry` | Angry | Angled inward brow line |
| `happy` | Happy | Slightly squinted, joyful |

### Eye Color (16 options)

| ID | Name | Hex Code |
|----|------|----------|
| `brown` | Brown | `#634E34` |
| `darkBrown` | Dark Brown | `#3D2314` |
| `hazel` | Hazel | `#8B7355` |
| `green` | Green | `#3D7A3D` |
| `blue` | Blue | `#4682B4` |
| `lightBlue` | Light Blue | `#87CEEB` |
| `gray` | Gray | `#708090` |
| `amber` | Amber | `#B8860B` |
| `violet` | Violet | `#8B008B` |
| `emerald` | Emerald | `#50C878` |
| `iceBlue` | Ice Blue | `#A5D8E6` |
| `gold` | Gold | `#DAA520` |
| `red` | Red | `#8B0000` |
| `black` | Black | `#1A1A1A` |
| `honey` | Honey | `#C9A06A` |
| `turquoise` | Turquoise | `#40E0D0` |

**Total Eye Combinations**: 12 shapes x 16 colors = **192 unique eye options**

### Eyebrow Shape (10 options)

| ID | Name | Description |
|----|------|-------------|
| `natural` | Natural | Balanced, standard arch |
| `arched` | Arched | High dramatic arch |
| `straight` | Straight | Flat, horizontal brows |
| `thick` | Thick | Full, bold brows |
| `thin` | Thin | Delicate, fine brows |
| `angry` | Angry | Angled down toward center |
| `worried` | Worried | Angled up toward center |
| `bushy` | Bushy | Wild, untamed look |
| `sleek` | Sleek | Thin with elegant arch |
| `curved` | Curved | Pronounced curved shape |

### Nose Shape (8 options)

| ID | Name | Description |
|----|------|-------------|
| `button` | Button | Small, rounded tip |
| `pointed` | Pointed | Narrow with defined tip |
| `roman` | Roman | Prominent bridge curve |
| `snub` | Snub | Short with slight upturn |
| `wide` | Wide | Broader nostril base |
| `narrow` | Narrow | Thin, elongated bridge |
| `aquiline` | Aquiline | Pronounced curved bridge |
| `flat` | Flat | Low bridge, wide base |

### Mouth Shape (10 options)

| ID | Name | Description |
|----|------|-------------|
| `smile` | Smile | Gentle upward curve |
| `neutral` | Neutral | Relaxed, straight line |
| `grin` | Grin | Wide smile showing teeth |
| `smirk` | Smirk | Asymmetric half-smile |
| `pout` | Pout | Full lips, slight downturn |
| `open` | Open | Slightly parted lips |
| `small` | Small | Petite, compact mouth |
| `wide` | Wide | Broader mouth width |
| `thin` | Thin | Narrow lip fullness |
| `full` | Full | Plump, pronounced lips |

### Ear Shape (6 options)

| ID | Name | Description |
|----|------|-------------|
| `normal` | Normal | Standard ear shape and size |
| `small` | Small | Compact, closer to head |
| `large` | Large | Prominent, larger ears |
| `pointed` | Pointed | Elf-like pointed tips |
| `round` | Round | Soft, rounded lobes |
| `flat` | Flat | Close-set against head |

### Hair Style (30 options)

| ID | Name | Length | Coverage |
|----|------|--------|----------|
| `short-messy` | Short Messy | Short | 0.30 |
| `short-neat` | Short Neat | Short | 0.25 |
| `short-curly` | Short Curly | Short | 0.35 |
| `medium-straight` | Medium Straight | Medium | 0.50 |
| `medium-wavy` | Medium Wavy | Medium | 0.55 |
| `long-straight` | Long Straight | Long | 0.70 |
| `long-wavy` | Long Wavy | Long | 0.75 |
| `ponytail` | Ponytail | Medium | 0.40 |
| `pigtails` | Pigtails | Medium | 0.45 |
| `bun` | Bun | Long | 0.35 |
| `mohawk` | Mohawk | Short | 0.20 |
| `afro` | Afro | Medium | 0.80 |
| `buzz` | Buzz Cut | Short | 0.15 |
| `bald` | Bald | None | 0.00 |
| `sidepart` | Side Part | Short | 0.30 |
| `spiky` | Spiky | Short | 0.35 |
| `slicked` | Slicked Back | Short | 0.25 |
| `bob` | Bob | Medium | 0.50 |
| `pixie` | Pixie | Short | 0.35 |
| `braids` | Braids | Long | 0.60 |
| `dreads` | Dreads | Long | 0.70 |
| `undercut` | Undercut | Short | 0.25 |
| `fauxhawk` | Faux Hawk | Short | 0.30 |
| `mullet` | Mullet | Medium | 0.45 |
| `bowl` | Bowl Cut | Medium | 0.55 |
| `combover` | Comb Over | Short | 0.20 |
| `bangs` | Bangs | Medium | 0.50 |
| `sidesweep` | Side Sweep | Medium | 0.45 |
| `topknot` | Top Knot | Long | 0.30 |
| `cornrows` | Cornrows | Medium | 0.40 |

### Hair Color (20 options)

| ID | Name | Hex Code | Type |
|----|------|----------|------|
| `black` | Black | `#1A1A1A` | Natural |
| `darkBrown` | Dark Brown | `#2C1810` | Natural |
| `brown` | Brown | `#4A3728` | Natural |
| `lightBrown` | Light Brown | `#7A5A3A` | Natural |
| `auburn` | Auburn | `#8B4513` | Natural |
| `ginger` | Ginger | `#B5651D` | Natural |
| `strawberry` | Strawberry | `#C67171` | Natural |
| `blonde` | Blonde | `#D4B896` | Natural |
| `platinum` | Platinum | `#E8E4C9` | Natural |
| `white` | White | `#F0F0F0` | Natural |
| `gray` | Gray | `#808080` | Natural |
| `red` | Red | `#CC0000` | Fantasy |
| `blue` | Blue | `#0066CC` | Fantasy |
| `purple` | Purple | `#7B2D8E` | Fantasy |
| `green` | Green | `#228B22` | Fantasy |
| `pink` | Pink | `#FF69B4` | Fantasy |
| `teal` | Teal | `#008B8B` | Fantasy |
| `orange` | Orange | `#FF6600` | Fantasy |
| `silver` | Silver | `#C0C0C0` | Fantasy |
| `rainbow` | Rainbow | Gradient | Fantasy |

### Facial Hair (10 options)

| ID | Name | Coverage | Description |
|----|------|----------|-------------|
| `none` | None | - | Clean shaven |
| `stubble` | Stubble | Light | 5 o'clock shadow |
| `goatee` | Goatee | Chin | Chin beard only |
| `mustache` | Mustache | Upper lip | Classic mustache |
| `fullBeard` | Full Beard | Full face | Complete beard coverage |
| `shortBeard` | Short Beard | Full face | Trimmed full beard |
| `soulPatch` | Soul Patch | Chin center | Small chin patch |
| `mutton` | Mutton Chops | Sides | Sideburn-connected style |
| `handlebar` | Handlebar | Upper lip | Curled mustache tips |
| `vandyke` | Van Dyke | Chin + mustache | Goatee with mustache |

### Body Type (6 options)

| ID | Name | Width Ratio | Height Ratio |
|----|------|-------------|--------------|
| `slim` | Slim | 0.80 | 1.00 |
| `average` | Average | 1.00 | 1.00 |
| `athletic` | Athletic | 1.10 | 1.00 |
| `stocky` | Stocky | 1.20 | 0.95 |
| `tall` | Tall | 0.95 | 1.15 |
| `short` | Short | 1.00 | 0.85 |

### Clothing Style (4 options)

| ID | Name | Has Collar | Sleeve Length | Special |
|----|------|------------|---------------|---------|
| `casual` | Casual | No | Short | - |
| `sporty` | Sporty | No | Short | Stripes |
| `formal` | Formal | Yes | Long | Buttons |
| `scifi` | Sci-Fi | Yes | Long | Glow effects |

### Clothing Color (20 preset colors)

```
#E74C3C  #E67E22  #F1C40F  #2ECC71  #1ABC9C
#3498DB  #9B59B6  #34495E  #95A5A6  #ECF0F1
#C0392B  #D35400  #F39C12  #27AE60  #16A085
#2980B9  #8E44AD  #2C3E50  #7F8C8D  #BDC3C7
```

---

## Earned Accessories

### Rarity System

| Rarity | Color | Level Range | Hex Code |
|--------|-------|-------------|----------|
| Common | Gray | 1-15 | `#9D9D9D` |
| Uncommon | Green | 16-30 | `#1EFF00` |
| Rare | Blue | 31-50 | `#0070DD` |
| Epic | Purple | 51-70 | `#A335EE` |
| Legendary | Orange | 71-90 | `#FF8000` |
| Mythic | Gold | 91-100 | `#E6CC80` |

### Eyewear (15 items)

| ID | Name | Unlock Level | Rarity | Has Effect | Description |
|----|------|--------------|--------|------------|-------------|
| `sunglasses-classic` | Classic Sunglasses | 5 | Common | No | Timeless shades for any occasion |
| `aviator` | Aviator Glasses | 10 | Common | No | Top Gun approved eyewear |
| `nerd-glasses` | Nerd Glasses | 15 | Common | No | Intelligence +100 (cosmetic only) |
| `3d-glasses` | 3D Glasses | 20 | Uncommon | No | See the world in a whole new dimension |
| `goggles` | Goggles | 25 | Uncommon | No | Ready for adventure or science experiments |
| `monocle` | Monocle | 30 | Uncommon | No | Distinguished and sophisticated |
| `star-glasses` | Star Glasses | 35 | Rare | No | You are a star! |
| `heart-glasses` | Heart Glasses | 40 | Rare | No | Spread the love wherever you go |
| `sport-visor` | Sport Visor | 45 | Rare | No | Professional gamer gear |
| `vr-headset` | VR Headset | 50 | Epic | No | Immerse yourself in virtual worlds |
| `cyber-visor` | Cyber Visor | 55 | Epic | No | Sleek futuristic eye protection |
| `x-ray-specs` | X-Ray Specs | 60 | Epic | Yes | See through walls... probably |
| `laser-eyes` | Laser Eyes | 70 | Legendary | Yes | Pew pew! Lasers shoot from your eyes |
| `diamond-glasses` | Diamond Glasses | 80 | Legendary | No | Pure crystallized luxury |
| `cosmic-lenses` | Cosmic Lenses | 90 | Mythic | Yes | Gaze upon the infinite universe |

### Headwear (20 items)

| ID | Name | Unlock Level | Rarity | Has Effect | Description |
|----|------|--------------|--------|------------|-------------|
| `baseball-cap` | Baseball Cap | 3 | Common | No | A classic casual cap |
| `backwards-cap` | Backwards Cap | 8 | Common | No | Cool kids wear it backwards |
| `beanie` | Beanie | 12 | Common | No | Cozy knitted headwear |
| `party-hat` | Party Hat | 18 | Uncommon | No | Every day is a celebration! |
| `chef-hat` | Chef Hat | 22 | Uncommon | No | Master of the kitchen |
| `crown-bronze` | Bronze Crown | 25 | Uncommon | No | A humble crown for rising royalty |
| `hard-hat` | Hard Hat | 26 | Uncommon | No | Safety first on the job site |
| `wizard-hat` | Wizard Hat | 30 | Rare | No | Channel your inner sorcerer |
| `pirate-hat` | Pirate Hat | 35 | Rare | No | Arrr! Set sail for adventure |
| `santa-hat` | Santa Hat | 38 | Rare | No | Ho ho ho! Spread holiday cheer |
| `crown-silver` | Silver Crown | 40 | Rare | No | A noble crown for dedicated players |
| `graduation-cap` | Graduation Cap | 42 | Rare | No | Scholar of the gaming arts |
| `bunny-ears` | Bunny Ears | 45 | Rare | No | Hop into the fun! |
| `devil-horns` | Devil Horns | 48 | Rare | No | A little mischief never hurt anyone |
| `halo` | Halo | 52 | Epic | Yes | An angelic golden ring of light |
| `top-hat` | Top Hat | 56 | Epic | No | Dapper and distinguished |
| `crown-gold` | Gold Crown | 60 | Epic | No | True royalty in golden splendor |
| `viking-helmet` | Viking Helmet | 62 | Epic | No | Conquer games like a Norse warrior |
| `crown-diamond` | Diamond Crown | 80 | Legendary | Yes | A magnificent crown of pure diamonds |
| `crown-cosmic` | Cosmic Crown | 100 | Mythic | Yes | The ultimate crown, forged from stardust |

### Effects/Auras (10 items)

| ID | Name | Unlock Level | Rarity | Effect Type | Color | Description |
|----|------|--------------|--------|-------------|-------|-------------|
| `sparkle-trail` | Sparkle Trail | 15 | Uncommon | Particles | `#FFD700` | Leave a trail of golden sparkles |
| `fire-aura` | Fire Aura | 25 | Rare | Glow | `#FF4500` | Surrounded by fierce flames |
| `lightning-crackle` | Lightning Crackle | 35 | Rare | Electric | `#00BFFF` | Electricity crackles around you |
| `rainbow-glow` | Rainbow Glow | 45 | Epic | Glow | Rainbow | Radiate all colors of the spectrum |
| `star-particles` | Star Particles | 55 | Epic | Particles | `#FFFF00` | Tiny stars orbit around you |
| `ice-crystals` | Ice Crystals | 65 | Legendary | Particles | `#87CEEB` | Frozen crystals shimmer around you |
| `shadow-effect` | Shadow Effect | 70 | Legendary | Shadow | `#2F2F4F` | Darkness follows your every move |
| `golden-glow` | Golden Glow | 75 | Legendary | Glow | `#FFD700` | Bathe in pure golden light |
| `void-aura` | Void Aura | 85 | Mythic | Void | `#4B0082` | The void itself surrounds you |
| `cosmic-trail` | Cosmic Trail | 95 | Mythic | Cosmic | Cosmic | Trail galaxies and nebulae in your wake |

**Total Accessories**: 15 + 20 + 10 = **45 unlockable items**

---

## Rendering Modes

### HEAD_ONLY (64x64 pixels)

**Best for**: Cockpit views, flying games (Flappy Bird style), maze games, puzzle games

**Shows**: Face, hair, ears, accessories (eyewear, headwear, effects)

**Animations** (5):
| ID | Name | Frames | Duration | Loop | Description |
|----|------|--------|----------|------|-------------|
| `bob` | Bob | 3 | 150ms | Yes | Gentle up/down bobbing motion |
| `flap` | Flap | 2 | 80ms | Yes | Flapping motion with head squash/stretch |
| `blink` | Blink | 3 | 60ms | No | Eye blink animation |
| `celebrate` | Celebrate | 4 | 100ms | No | Happy bouncing celebration |
| `hurt` | Hurt | 2 | 80ms | No | Damage reaction shake |

### HEAD_AND_SHOULDERS (64x96 pixels)

**Best for**: Driving games, conversation scenes, submarine games, portrait views

**Shows**: Head, neck, shoulders, clothing collar

**Animations** (6):
| ID | Name | Frames | Duration | Loop | Description |
|----|------|--------|----------|------|-------------|
| `idle` | Idle | 3 | 400ms | Yes | Subtle breathing motion |
| `turn-left` | Turn Left | 2 | 100ms | No | Head turns to the left |
| `turn-right` | Turn Right | 2 | 100ms | No | Head turns to the right |
| `look-up` | Look Up | 2 | 100ms | No | Head tilts upward |
| `celebrate` | Celebrate | 3 | 120ms | No | Bounce and smile celebration |
| `hurt` | Hurt | 2 | 100ms | No | Recoil damage reaction |

### UPPER_BODY (64x128 pixels)

**Best for**: Racing games, shooting games, hoverboard games, action sequences

**Shows**: Head, neck, shoulders, torso, arms, hands

**Animations** (8):
| ID | Name | Frames | Duration | Loop | Description |
|----|------|--------|----------|------|-------------|
| `idle` | Idle | 3 | 400ms | Yes | Breathing with subtle arm sway |
| `wave` | Wave | 4 | 120ms | No | Friendly arm wave gesture |
| `point` | Point | 3 | 100ms | No | Pointing forward gesture |
| `steer-left` | Steer Left | 2 | 80ms | No | Leaning left for racing/steering |
| `steer-right` | Steer Right | 2 | 80ms | No | Leaning right for racing/steering |
| `shoot` | Shoot | 3 | 60ms | No | Arm extends forward shooting motion |
| `celebrate` | Celebrate | 4 | 120ms | No | Arms up victory celebration |
| `hurt` | Hurt | 2 | 100ms | No | Recoil backwards damage reaction |

### FULL_BODY (64x160 pixels)

**Best for**: Platformers, RPGs, sports games, adventure games, fighting games

**Shows**: Complete character with head, body, arms, legs, shoes

**Animations** (12):
| ID | Name | Frames | Duration | Loop | Description |
|----|------|--------|----------|------|-------------|
| `idle` | Idle | 3 | 400ms | Yes | Standing with breathing motion |
| `walk` | Walk Cycle | 4 | 100ms | Yes | Walking with arm/leg swing |
| `run` | Run Cycle | 6 | 60ms | Yes | Running with full body movement |
| `jump` | Jump | 3 | 100ms | No | Crouch, leap, stretch sequence |
| `fall` | Fall | 2 | 150ms | Yes | Arms up, legs down falling pose |
| `crouch` | Crouch | 2 | 80ms | No | Duck down into crouch position |
| `celebrate` | Celebrate | 6 | 100ms | No | Jump and arm wave celebration |
| `attack` | Attack | 4 | 60ms | No | Punch or swing attack motion |
| `hurt` | Hurt | 3 | 80ms | No | Stagger backwards damage reaction |
| `climb` | Climb | 4 | 120ms | Yes | Climbing ladder/wall motion |
| `swim` | Swim | 4 | 150ms | Yes | Swimming stroke animation |
| `fly` | Fly | 4 | 100ms | Yes | Superhero flying pose |

---

## API Reference

### Creating Avatars

```javascript
// Create avatar with custom options
const avatar = AvatarSystem.create({
    faceShape: 'round',
    skinTone: '#FFD5B8',
    eyes: { shape: 'round', color: '#4A90D9' },
    eyebrows: 'natural',
    nose: 'button',
    mouth: 'smile',
    ears: 'normal',
    hair: { style: 'short-messy', color: '#3D2314' },
    facialHair: 'none',
    body: { type: 'average' },
    clothing: { style: 'casual', shirtColor: '#3498DB', pantsColor: '#2C3E50' }
});

// Create default avatar
const defaultAvatar = AvatarSystem.createDefault();

// Get random guest avatar
const guestAvatar = AvatarSystem.getGuestAvatar();
```

### Loading and Saving

```javascript
// Load user's saved avatar
const avatar = await AvatarSystem.loadUserAvatar(userId);

// Save avatar
AvatarSystem.saveAvatar(avatar);

// Clear cache
AvatarSystem.clearCache(userId);  // Clear specific user
AvatarSystem.clearCache();        // Clear all
```

### Rendering

```javascript
// Render to canvas context
AvatarSystem.render(avatar, 'FULL_BODY', ctx, x, y, {
    scale: 1,
    animation: 'walk',
    frame: 0
});

// Render to offscreen canvas
const canvas = AvatarSystem.renderToCanvas(avatar, 'HEAD_ONLY', { scale: 2 });

// Render to data URL (for images)
const dataUrl = AvatarSystem.renderToDataURL(avatar, 'HEAD_AND_SHOULDERS');

// Get mode dimensions
const size = AvatarSystem.getModeSize('FULL_BODY');
// Returns: { width: 64, height: 160 }
```

### Animation Control

```javascript
// Start animation
AvatarSystem.startAnimation(avatarId, 'walk', {
    loop: true,
    mode: 'FULL_BODY',
    onComplete: () => console.log('Animation finished')
});

// Stop animation
AvatarSystem.stopAnimation(avatarId);

// Get current animation state
const state = AvatarSystem.getAnimationState(avatarId);
// Returns: { animation: 'walk', frame: 2, complete: false, transforms: {...} }

// Check if animating
const isAnimating = AvatarSystem.isAnimating(avatarId);

// Get animation frame transforms directly
const transforms = AvatarSystem.animate(avatar, 'run', frameNumber);
```

### Accessory Management

```javascript
// Equip accessory
AvatarSystem.equipAccessory(avatar, 'headwear', 'crown-gold');
AvatarSystem.equipAccessory(avatar, 'eyewear', 'sunglasses-classic');
AvatarSystem.equipAccessory(avatar, 'effect', 'sparkle-trail');

// Unequip accessory
AvatarSystem.unequipAccessory(avatar, 'headwear');

// Unlock/award accessory
const newlyUnlocked = AvatarSystem.unlockAccessory(avatar, 'vr-headset');
// Returns: true if newly unlocked, false if already owned

// Check if avatar has accessory
const hasItem = AvatarSystem.hasAccessory(avatar, 'crown-gold');

// Get earned accessories (full objects)
const earned = AvatarSystem.getEarnedAccessories(avatar);
// Returns: { eyewear: [...], headwear: [...], effects: [...] }

// Get equipped accessories (full objects)
const equipped = AvatarSystem.getEquippedAccessories(avatar);
// Returns: { eyewear: {...}, headwear: {...}, effect: {...} }

// Get full accessory catalog
const catalog = AvatarSystem.getAccessoryCatalog();
```

### Level Unlocks

```javascript
// Check what unlocks at a specific level
const newItems = AvatarSystem.checkLevelUnlocks(avatar, 50);
// Returns: Array of newly unlocked accessory objects

// Add XP and check for level ups
const result = AvatarSystem.addXP(avatar, 500);
// Returns: { newLevel: 12, leveledUp: true, unlockedItems: [...] }

// Get XP progress info
const xpInfo = AvatarSystem.getXPInfo(avatar);
// Returns: { level, totalXP, currentLevelXP, xpNeededForLevel, progress }
```

### Game Integration

```javascript
// Export avatar for use in a game
const gameAvatar = AvatarSystem.exportForGame(avatar, 'FULL_BODY');
// Returns object with render() and animate() methods

// Use in game loop
gameAvatar.render(ctx, x, y, { animation: 'run', frame: frameNum });
const animInfo = gameAvatar.getAnimationInfo('run');

// Export minimal data for network transmission
const minimal = AvatarSystem.exportMinimal(avatar);

// Import from minimal data
const fullAvatar = AvatarSystem.importMinimal(minimalData, userId);

// Create sprite sheet for performance
const spriteSheet = AvatarSystem.createSpriteSheet(avatar, 'FULL_BODY', ['idle', 'walk', 'run']);
// Returns: { canvas, frameWidth, frameHeight, getFrameRect(animId, frame) }
```

### Utility Functions

```javascript
// Clone avatar
const cloned = AvatarSystem.clone(avatar);

// Update base properties
AvatarSystem.updateBase(avatar, { hair: { style: 'afro', color: '#000000' } });

// Validate avatar data
const isValid = AvatarSystem.validate(avatarData);

// Compare avatars
const areEqual = AvatarSystem.equals(avatar1, avatar2);

// Get all customization options
const options = AvatarSystem.getCustomizationOptions();
// Returns: { faceShapes, skinTones, eyeShapes, eyeColors, ... }

// Check if guest avatar
const isGuest = AvatarSystem.isGuest(avatar);

// Convert guest to registered user
const userAvatar = AvatarSystem.convertGuestToUser(guestAvatar, newUserId);

// Get version info
const version = AvatarSystem.getVersion();
```

---

## Guest Avatars

10 pre-defined guest avatars are available for non-logged-in users. Each has a unique appearance:

| ID | Name | Skin Tone | Hair Style | Eye Color | Clothing Color |
|----|------|-----------|------------|-----------|----------------|
| `guest_1` | Guest Blue | Medium | Short Messy | Blue | `#3498DB` |
| `guest_2` | Guest Red | Light | Long Straight | Brown | `#E74C3C` |
| `guest_3` | Guest Green | Tan | Buzz Cut | Dark Brown | `#2ECC71` |
| `guest_4` | Guest Purple | Fair | Bob | Green | `#9B59B6` |
| `guest_5` | Guest Orange | Brown | Afro | Amber | `#E67E22` |
| `guest_6` | Guest Teal | Dark | Dreads | Dark Brown | `#1ABC9C` |
| `guest_7` | Guest Gray | Light | Undercut | Gray | `#95A5A6` |
| `guest_8` | Guest Yellow | Medium | Spiky | Hazel | `#F1C40F` |
| `guest_9` | Guest Navy | Tan | Comb Over | Brown | `#2C3E50` |
| `guest_10` | Guest Pink | Fair | Pigtails | Light Blue | `#FF69B4` |

```javascript
// Get random guest avatar
const guest = AvatarSystem.getGuestAvatar();

// Or use AvatarData directly
const guestData = AvatarData.getRandomGuestAvatar();
```

---

## XP and Leveling System

### XP Per Level Formula

```
XP needed for level N = 100 + (N - 1) * 50
```

| Level | XP Needed | Cumulative XP |
|-------|-----------|---------------|
| 1 | 100 | 100 |
| 2 | 150 | 250 |
| 3 | 200 | 450 |
| 5 | 300 | 1,000 |
| 10 | 550 | 3,500 |
| 25 | 1,300 | 18,250 |
| 50 | 2,550 | 68,000 |
| 75 | 3,800 | 148,500 |
| 100 | 5,050 | 259,750 |

### Unlock Schedule

All accessories unlock by reaching specific levels:

- **Levels 3-15**: 6 Common items
- **Levels 18-30**: 8 Uncommon items
- **Levels 35-48**: 10 Rare items
- **Levels 50-62**: 8 Epic items
- **Levels 65-80**: 6 Legendary items
- **Levels 85-100**: 4 Mythic items

---

## Accessory Animation Rules

Accessories follow specific animation behavior:

```javascript
{
    headwear: {
        followHead: true,       // Moves with head
        bounceMultiplier: 1.2,  // Extra bounce on jumps
        rotationDamping: 0.8    // Slightly less rotation than head
    },
    eyewear: {
        followHead: true,       // Moves with head
        bounceMultiplier: 1.0,  // Same bounce as head
        rotationDamping: 1.0    // Matches head rotation exactly
    },
    effects: {
        independent: true,      // Own animation cycle
        particleSpeed: 1.0      // Particle emission rate
    }
}
```

---

## Performance Tips

### Sprite Caching

For games with many avatars or frequent redraws:

```javascript
// Pre-render to sprite cache
const cache = AvatarRenderer.createSpriteCache(avatars, 'HEAD_ONLY', 1);

// Render from cache (much faster)
AvatarRenderer.renderFromCache(ctx, cache, avatarId, x, y);
```

### Sprite Sheets

For animation-heavy games:

```javascript
const sheet = AvatarSystem.createSpriteSheet(avatar, 'FULL_BODY', ['idle', 'walk', 'run', 'jump']);

// In game loop
const rect = sheet.getFrameRect('walk', currentFrame);
ctx.drawImage(sheet.image, rect.x, rect.y, rect.width, rect.height, destX, destY, rect.width, rect.height);
```

### Batch Rendering

For many avatars on screen:

```javascript
AvatarRenderer.renderBatch(ctx, avatars, 'HEAD_ONLY', positions);
// Automatically skips off-screen avatars
```

---

## File Dependencies

Load order matters. Include scripts in this order:

```html
<script src="/assets/avatar/avatarData.js"></script>
<script src="/assets/avatar/animations.js"></script>
<script src="/assets/avatar/avatarRenderer.js"></script>
<script src="/assets/avatar/accessories.js"></script>
<script src="/assets/avatar/accessoryRenderer.js"></script>
<script src="/assets/avatar/avatarSystem.js"></script>
```

Or use the asset manager which handles loading automatically.