dawarich/app/javascript/maps_v2/START_HERE.md

# 🚀 Start Here - Maps V2 Implementation

## Welcome!

You're about to implement a **modern, mobile-first map** for Dawarich using **incremental MVP approach**. This means you can deploy after **every single phase** and get working software in production early.

---

## 📖 Reading Order

### 1. **PHASES_OVERVIEW.md** (5 min read)
Understand the philosophy behind incremental implementation and why each phase is deployable.

**Key takeaways**:
- Each phase delivers working software
- E2E tests catch regressions
- Safe rollback at any point
- Get user feedback early

### 2. **PHASES_SUMMARY.md** (10 min read)
Quick reference for all 8 phases showing what each adds.

**Key takeaways**:
- Phase progression from MVP to full feature parity
- New files created in each phase
- E2E test coverage
- Feature flags strategy

### 3. **README.md** (10 min read)
Complete guide with architecture, features, and quick start.

**Key takeaways**:
- Architecture principles
- Feature parity table
- Performance targets
- Implementation checklist

---

## 🎯 Your First Week: Phase 1 MVP

### Day 1-2: Setup & Planning
1. **Read [PHASE_1_MVP.md](./PHASE_1_MVP.md)** (30 min)
2. Install MapLibre GL JS: `npm install maplibre-gl`
3. Review Rails controller setup
4. Plan your development environment

### Day 3-4: Implementation
1. Create all Phase 1 files (copy-paste from guide)
2. Update routes (`config/routes.rb`)
3. Create controller (`app/controllers/maps_v2_controller.rb`)
4. Test locally: Visit `/maps_v2`

### Day 5: Testing
1. Write E2E tests (`e2e/v2/phase-1-mvp.spec.ts`)
2. Run tests: `npx playwright test e2e/v2/phase-1-mvp.spec.ts`
3. Fix any failing tests
4. Manual QA checklist

### Day 6-7: Deploy & Validate
1. Deploy to staging
2. User acceptance testing
3. Monitor performance
4. Deploy to production (if approved)

**Success criteria**: Users can view location history on a map with points.

---

## 📁 File Structure After Phase 1

```
app/javascript/maps_v2/
├── controllers/
│   └── map_controller.js              ✅ Main controller
├── services/
│   └── api_client.js                  ✅ API wrapper
├── layers/
│   ├── base_layer.js                  ✅ Base class
│   └── points_layer.js                ✅ Points + clustering
├── utils/
│   └── geojson_transformers.js        ✅ API → GeoJSON
└── components/
    └── popup_factory.js               ✅ Point popups

app/views/maps_v2/
└── index.html.erb                     ✅ Main view

app/controllers/
└── maps_v2_controller.rb              ✅ Rails controller

e2e/v2/
├── phase-1-mvp.spec.ts               ✅ E2E tests
└── helpers/
    └── setup.ts                       ✅ Test helpers
```

---

## ✅ Phase 1 Completion Checklist

### Code
- [ ] All 6 JavaScript files created
- [ ] View template created
- [ ] Rails controller created
- [ ] Routes updated
- [ ] MapLibre GL JS installed

### Functionality
- [ ] Map renders successfully
- [ ] Points load from API
- [ ] Clustering works at low zoom
- [ ] Popups show on point click
- [ ] Month selector changes data
- [ ] Loading indicator shows

### Testing
- [ ] E2E tests written
- [ ] All E2E tests pass
- [ ] Manual testing complete
- [ ] No console errors
- [ ] Tested on mobile viewport
- [ ] Tested on desktop viewport

### Performance
- [ ] Map loads in < 3 seconds
- [ ] Points render smoothly
- [ ] No memory leaks (DevTools check)

### Deployment
- [ ] Deployed to staging
- [ ] Staging URL accessible
- [ ] User acceptance testing
- [ ] Performance acceptable
- [ ] Ready for production

---

## 🎉 After Phase 1 Success

Congratulations! You now have a **working location history map** in production.

### Next Steps:

**Option A: Continue to Phase 2** (Recommended)
- Read [PHASE_2_ROUTES.md](./PHASE_2_ROUTES.md)
- Add routes layer + enhanced navigation
- Deploy in Week 2

**Option B: Get User Feedback**
- Let users try Phase 1
- Collect feedback
- Prioritize Phase 2 based on needs

**Option C: Expand Phase 3-8**
- Ask: "expand phase 3"
- I'll create full implementation guide
- Continue incremental deployment

---

## 🆘 Need Help?

### Common Questions

**Q: Can I skip phases?**
A: No, each phase builds on the previous. Phase 2 requires Phase 1, etc.

**Q: Can I deploy after Phase 1?**
A: Yes! That's the whole point. Each phase is deployable.

**Q: What if Phase 1 has bugs?**
A: Fix them before moving to Phase 2. Each phase should be stable.

**Q: How long does each phase take?**
A: ~1 week per phase for solo developer. Adjust based on team size.

**Q: Can I modify the phases?**
A: Yes, but maintain the incremental approach. Don't break Phase N when adding Phase N+1.

### Getting Unstuck

**Map doesn't render:**
- Check browser console for errors
- Verify MapLibre GL JS is installed
- Check API key is correct
- Review Network tab for API calls

**Points don't load:**
- Check API response in Network tab
- Verify date range has data
- Check GeoJSON transformation
- Test API endpoint directly

**E2E tests fail:**
- Run in headed mode: `npx playwright test --headed`
- Check test selectors match your HTML
- Verify test data exists (demo user has points)
- Check browser console in test

**Deploy fails:**
- Verify all files committed
- Check for missing dependencies
- Review Rails logs
- Test locally first

---

## 📊 Progress Tracking

| Phase | Status | Deployed | User Feedback |
|-------|--------|----------|---------------|
| 1. MVP | 🔲 Todo | ❌ Not deployed | - |
| 2. Routes | 🔲 Todo | ❌ Not deployed | - |
| 3. Mobile | 🔲 Todo | ❌ Not deployed | - |
| 4. Visits | 🔲 Todo | ❌ Not deployed | - |
| 5. Areas | 🔲 Todo | ❌ Not deployed | - |
| 6. Advanced | 🔲 Todo | ❌ Not deployed | - |
| 7. Realtime | 🔲 Todo | ❌ Not deployed | - |
| 8. Performance | 🔲 Todo | ❌ Not deployed | - |

Update this table as you progress!

---

## 🎓 Learning Resources

### MapLibre GL JS
- [Official Docs](https://maplibre.org/maplibre-gl-js-docs/api/)
- [Examples](https://maplibre.org/maplibre-gl-js-docs/example/)
- [Style Spec](https://maplibre.org/maplibre-gl-js-docs/style-spec/)

### Stimulus.js
- [Handbook](https://stimulus.hotwired.dev/handbook/introduction)
- [Reference](https://stimulus.hotwired.dev/reference/controllers)
- [Best Practices](https://stimulus.hotwired.dev/handbook/managing-state)

### Playwright
- [Getting Started](https://playwright.dev/docs/intro)
- [Writing Tests](https://playwright.dev/docs/writing-tests)
- [Debugging](https://playwright.dev/docs/debug)

---

## 🚀 Ready to Start?

1. **Read PHASE_1_MVP.md**
2. **Create the files**
3. **Run the tests**
4. **Deploy to staging**
5. **Celebrate!** 🎉

You've got this! Start with Phase 1 and build incrementally.

---

## 💡 Pro Tips

- ✅ **Commit after each file** - Easy to track progress
- ✅ **Test continuously** - Don't wait until the end
- ✅ **Deploy early** - Get real user feedback
- ✅ **Document decisions** - Future you will thank you
- ✅ **Keep it simple** - Don't over-engineer Phase 1
- ✅ **Celebrate wins** - Each deployed phase is a victory!

**Good luck with your implementation!** 🗺️