# Phase 6 - NFT Display Implementation

**Date**: 2026-03-29
**Status**: ✅ Complete
**Build**: SUCCESS

## Summary

Implemented NFT display feature for Element X ADA wallet. NFTs now display with thumbnails in the Assets tab, and tapping an NFT opens a detail bottom sheet with full metadata.

## Features Delivered

### 1. NFT Metadata Fetching (KoiosCardanoClient)
- Added `getNftMetadata(policyId, assetName)` method to CardanoClient interface
- Implemented Koios `asset_info` endpoint integration
- Parses CIP-25 `onchain_metadata` for:
  - `name` - NFT name
  - `image` - Handles both String and Array formats
  - `description` - NFT description
  - Full `rawMetadata` map for additional fields
- IPFS URL resolution: `ipfs://Qm...` → `https://ipfs.io/ipfs/Qm...`
- In-memory cache to avoid redundant API calls

### 2. NftMetadata Data Class
```kotlin
data class NftMetadata(
    val name: String,
    val image: String?,  // Resolved HTTP URL
    val description: String?,
    val rawMetadata: Map<String, Any>,
)
```

### 3. Assets Tab UI Updates
- NFT thumbnails: 64dp square with 8dp rounded corners
- Uses Coil 3.x `AsyncImage` with proper state handling
- Loading state: `CircularProgressIndicator`
- Error state: `BrokenImage` icon placeholder
- FTs (fungible tokens) show quantity without thumbnail
- Click on NFT row opens detail bottom sheet

### 4. NFT Detail Bottom Sheet
- Full-size image with proper aspect ratio
- NFT name and description
- Truncated policy ID
- Raw metadata key/value pairs (filtered, max 100 chars)
- Close button (Element design system style)

### 5. Metadata Loading Strategy
- Parallel fetching in presenter for visible NFTs (max 10 batch)
- Results cached for 30 minutes
- Graceful fallback on parse errors
- Never blocks UI - all async

## Technical Details

### Files Modified
- `features/wallet/api/CardanoClient.kt` - Added getNftMetadata()
- `features/wallet/api/NftMetadata.kt` - New data class
- `features/wallet/impl/cardano/KoiosCardanoClient.kt` - Implementation
- `features/wallet/impl/panel/WalletPanelPresenter.kt` - Metadata enrichment
- `features/wallet/impl/panel/tabs/AssetsTabView.kt` - UI with thumbnails + bottom sheet
- `features/wallet/test/FakeCardanoClient.kt` - Test support

### API Endpoint
```
POST https://api.koios.rest/api/v1/asset_info
Body: {"_asset_list": [["<policyId>", "<assetNameHex>"]]}
```

### Commit
```
2d8df4f23f feat(wallet): NFT thumbnails and metadata display in Assets tab
```

## Build Output
- APK: `/tmp/apk-serve/element-x-ada-mainnet.apk` (220MB arm64)
- Build time: ~19s (incremental)

## Phase 6 Complete
All three features for Phase 6 are now implemented:
1. ✅ ADA Handle resolution ($handle → address)
2. ✅ Token send (native asset transfer)
3. ✅ NFT display (thumbnails + detail view)

The Element X ADA wallet is feature-complete for mainnet use.