# Phase 06 — Implementation Priorities

## 🎯 FOKUS: FUNKTIONALITET ÖVER DESIGN

### Tier 1: MUST HAVE (IMPLEMENTERA NU)

**06-01: Workout Swap System** ✅
- [ ] API: POST /api/workouts/:id/swap (swap with another workout)
- [ ] API: GET /api/workouts/available (list swappable workouts)
- [ ] UI: Button "Byt pass" on workout page
- [ ] Database: Track swap history
- [ ] Reversible swaps (undo)

**06-02: Muscle Group Recovery Tracking** ✅
- [ ] Calculate: last workout date per muscle group
- [ ] Calculate: recovery score (0-100%)
- [ ] Display: recovery % on each muscle group
- [ ] API: GET /api/recovery/muscle-groups (current status)
- [ ] Database: muscle_group_recovery table

**06-03: Smart Workout Recommendations** ✅
- [ ] Algorithm: Which muscle groups are most recovered?
- [ ] Suggest: 2-3 workouts targeting recovered groups
- [ ] API: GET /api/recommendations/smart-workout
- [ ] Avoid: Overtraining same groups <48h
- [ ] One-tap: "Use this recommendation"

### Tier 2: SHOULD HAVE (EFTER TIER 1)

**06-04: Dashboard Analytics**
- [ ] Show: Weekly workout count
- [ ] Show: Total volume (kg)
- [ ] Show: Strength score trend
- [ ] Show: Muscle group activity heatmap
- [ ] API: GET /api/analytics/dashboard

**06-05: Library Improvements**
- [ ] Search exercises
- [ ] Filter by muscle group
- [ ] Show exercise details + form tips
- [ ] Categorize: Weights, Bodyweight, Cardio

### Tier 3: NICE TO HAVE (LATER)

**06-06: Achievement Badges**
**06-07: Social Features**
**06-08: Advanced Analytics**

---

## 📋 Implementation Order

1. **Backend First** — Recovery tracking + APIs
2. **Frontend Second** — UI for swap + recommendations  
3. **Integration** — Connect frontend to backend
4. **Testing** — E2E validation

## ⚡ Quick Wins

**Task 06-01 Implementation:**
```
Backend:
- Add swapped_from_id to workout_logs
- POST /api/workouts/:id/swap endpoint
- GET /api/workouts/available endpoint

Frontend:
- Add "Byt pass" button to WorkoutPage
- Simple modal: pick another workout
- Confirm swap action
```

**Task 06-02 Implementation:**
```
Backend:
- Calculate recovery per muscle group
- GET /api/recovery/muscle-groups endpoint
- Store in muscle_group_recovery table

Frontend:
- Display recovery % as number/badge
- Color code: red (0-33%), yellow (34-66%), green (67-100%)
- Update real-time when workout logged
```

**Task 06-03 Implementation:**
```
Backend:
- Analyze last 7 days: which muscles trained?
- Find most-recovered muscle groups
- GET /api/recommendations/smart-workout
- Return 2-3 workouts + reason

Frontend:
- "Byt till rekommenderat pass" button
- Show: "Du är väl återhämtad för [muscle group]"
- One-tap action
```

---

**Philosophy:** Function > Form. Build working features first. Polish UI later.

**Timeline:** 6-8 hours for Tier 1 (parallel backend + frontend)