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.

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📖 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

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🎯 Your First Week: Phase 1 MVP

Day 1-2: Setup & Planning

1. Read 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.

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📁 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

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✅ 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

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🎉 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
• 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

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🆘 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

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📊 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!

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🎓 Learning Resources

MapLibre GL JS

• Official Docs
• Examples
• Style Spec

Stimulus.js

• Handbook
• Reference
• Best Practices

Playwright

• Getting Started
• Writing Tests
• Debugging

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🚀 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.

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💡 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! 🗺️