# User Experience Comparison

## Old Behavior (Always Ask)
```
Run 1 (First time):
───────────────────
Script: "Which side first? [left/right]:"
You: "left"
[Flash left]
Script: "Flash right? [y/n]:"
You: "y"
[Flash right]

Run 2 (Second time):
────────────────────
Script: "Which side first? [left/right]:"  ← Asked again!
You: "left"
[Flash left]
Script: "Flash right? [y/n]:"
You: "y"
[Flash right]

Run 3, 4, 5...
──────────────
Same thing every time - always asking! 😕
```

## New Behavior (Smart Auto-Detect)
```
Run 1 (First time - Empty mapping):
────────────────────────────────────
Script: "Which side first? [left/right]:"  ← Only asked first time
You: "left"
[Flash left]
Script: "Flash other side? [y/n]:"
You: "y"
[Flash right]

Run 2 (Subsequent - Complete mapping):
───────────────────────────────────────
Script: "Plug in a keyboard half and enter bootloader..."
You: [Plugs in left half]
Script: "🎯 Auto-detected: left side"  ← No asking!
[Flash left]
Script: "Flash other side? [y/n]:"
You: "y"
You: [Plugs in right half]
Script: "🎯 Auto-detected: right side"  ← No asking!
[Flash right]

Run 3, 4, 5...
──────────────
Always auto-detects - never asks again! 🎉
```

## Workflow Comparison

### First Time Setup (Empty → Complete)

**Old:**
```
Ask → Flash left → Ask → Flash right
```

**New:**
```
Ask once → Flash left → Flash right (inferred)
```

### Normal Use (Complete mapping)

**Old:**
```
Ask every time → Flash
```

**New:**
```
Auto-detect → Flash  ← No asking!
```

## Decision Logic

```
┌─────────────────────┐
│ Check mapping state │
└──────────┬──────────┘
           │
     ┌─────┴──────┐
     │            │
     ▼            ▼
   Empty      Partial/Complete
     │            │
     ▼            ▼
   📝 ASK      🎯 AUTO-DETECT
```

## User Benefits

### Empty Mapping (First Time)
✅ **Asks** - Needs to learn your devices  
✅ **Simple** - Just answer "left" or "right"  
✅ **One-time** - Only happens once

### Partial Mapping (Learning Second Device)
✅ **Smart** - Knows which device is which  
✅ **Infers** - Unknown must be the unmapped side  
✅ **Automatic** - No asking needed

### Complete Mapping (Normal Use)
✅ **Instant** - Recognizes device immediately  
✅ **No questions** - Fully automatic  
✅ **Protected** - Rejects unknown devices

## Key Insight

**User knows their hardware!**
- If they replaced a controller → They know to clear mappings
- If mapping exists → Trust it and auto-detect
- Only ask when necessary (empty mapping)

## Example Sessions

### Session 1: Brand New Setup
```
$ ./autoflash_modular.sh

📝 First time setup - learning your keyboard halves

Which side will you flash first? [left/right]: left

Plug in left half and enter bootloader...
✅ Saved as left side
✅ left side flashed!

Flash the right side now? [y/n]: y

Plug in right half and enter bootloader...
✅ Saved as right side (completes mapping)
✅ right side flashed!

🎉 Complete! Mapping saved.
```

### Session 2: Normal Reflashing
```
$ ./autoflash_modular.sh

✅ Device mapping exists - auto-detection enabled

Plug in a keyboard half and enter bootloader...
🎯 Auto-detected: left side (known device)
✅ left side flashed!

Flash the other keyboard half now? [y/n]: y

Plug in other half and enter bootloader...
🎯 Auto-detected: right side (known device)
✅ right side flashed!

🎉 Done!
```

### Session 3: One Side Only
```
$ ./autoflash_modular.sh

✅ Device mapping exists - auto-detection enabled

Plug in a keyboard half and enter bootloader...
🎯 Auto-detected: right side (known device)
✅ right side flashed!

Flash the other keyboard half now? [y/n]: n

✅ Done!
```

## Summary

| Scenario | Old Behavior | New Behavior |
|----------|-------------|--------------|
| First time | Ask | Ask (once) |
| Second time | Ask | Auto-detect |
| Every time after | Ask | Auto-detect |
| User input needed | Always | Only first run |
| Speed | Slow | Fast |
| Convenience | Low | High |

**Result:** Ask once, auto-detect forever! 🚀