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Build Log — December 2, 2025

Build Log — December 2, 2025

📅 Daily Log — December 2, 2025

🧠 Context / Focus for Today

Major Garmin OAuth integration implementation. Replace username/password auth with OAuth tokens. Add Garmin connection UI component. Fix Garmin API endpoints and parameters. Refactor AI coach into modular structure.

✔️ Things I Got Done Today

Garmin OAuth Integration

OAuth Implementation

  • Add Garmin OAuth integration:

    • Replace username/password auth with OAuth tokens
    • Add OAuth initiation and callback routes
    • Create token helper with auto-refresh
    • Update import/export routes to use OAuth
    • Add database migration for garmin_integrations table
    • Add setup and update documentation
    • Secure authentication method

  • Fix Garmin OAuth to use PKCE (required by Garmin):

    • Add PKCE code_verifier and code_challenge
    • Store code_verifier in cookie for callback
    • Update token exchange to include code_verifier
    • Clear cookie after successful token exchange
    • Proper security implementation

  • Fix Garmin OAuth endpoints to use correct URLs:

    • Use oauthConfirm instead of oauth/authorize
    • Use connectapi.garmin.com for token endpoint
    • Proper endpoint configuration

  • Improve Garmin OAuth error logging and try oauth-service-1.3 endpoint:

    • Better error diagnostics
    • Multiple endpoint attempts
    • Improved reliability

  • Try di-oauth2-service endpoint for Garmin token exchange (primary endpoint):

    • Alternative endpoint support
    • Better compatibility

Garmin Connection UI

Component & API

  • Add Garmin connection UI component and API endpoints:
    • Add GarminConnection component with connect/disconnect/import
    • Add status and disconnect API endpoints
    • Update Header to show Garmin connection button
    • Update TrainingCalendarApp to handle Garmin OAuth callbacks
    • Remove email/password from Garmin import handler
    • Better user experience

Garmin API Fixes

Activity API

  • Add pull token support for Garmin Activity API:

    • Requires both OAuth2 Bearer token and pull token
    • Proper authentication
    • Better API access

  • Add permission check before fetching activities:

    • Verify ACTIVITY_EXPORT permission
    • Better error handling
    • Improved reliability

  • Improve error handling for InvalidPullTokenException:

    • Activity API may require pull tokens not OAuth2
    • Better error messages
    • Improved diagnostics

API Parameters

  • Fix Garmin API parameters - use startTime/endTime instead of startDate/endDate:

    • Proper parameter names
    • Better API compatibility

  • Fix Garmin API: Use correct parameters uploadStartTimeInSeconds/uploadEndTimeInSeconds with Unix timestamps in seconds:

    • Proper timestamp format
    • Correct parameter names
    • Better API compatibility

  • Try multiple time range parameter formats for Garmin API (ISO strings, from/to, etc.):

    • Multiple format attempts
    • Better compatibility
    • Improved reliability

  • Try YYYY-MM-DD date format for Garmin API time range parameters:

    • Alternative date format
    • Better compatibility

  • Try seconds instead of milliseconds for Garmin API timestamps:

    • Alternative timestamp format
    • Better compatibility

  • Fix Garmin activities API - use milliseconds for timestamps and try multiple endpoints:

    • Proper timestamp format
    • Multiple endpoint attempts
    • Better reliability

  • Split large date ranges into 24-hour chunks to comply with Garmin API limit:

    • API limit compliance
    • Better data retrieval
    • Improved reliability

  • Fallback to fetching all activities without date filters if time range params fail:

    • Graceful degradation
    • Better error handling
    • Improved reliability

  • Add Garmin API test endpoint and improve error messages:

    • Testing infrastructure
    • Better diagnostics
    • Improved debugging

  • Update error message: Activity API requires pull token, may need both Bearer token and pull token:

    • Clearer error messages
    • Better user guidance

AI Coach Refactoring

Modular Structure

  • Refactor AI coach: extract intent detection, examples, and message building into modular ai/ directory:

    • Better code organization
    • Improved maintainability
    • Modular architecture
    • Better code structure

  • Add aggressive filtering to prevent workouts for analysis requests:

    • Better request handling
    • Improved functionality

  • Add immediate JSON rejection for analysis requests:

    • Faster response
    • Better handling

  • Fix AI coach to return pace analysis in chat instead of creating workouts:

    • Proper response format
    • Better user experience

Chat Improvements

Auto-Scroll

  • Improve chatbot auto-scroll: use useLayoutEffect and better content tracking:

    • Better scroll behavior
    • Improved UX

  • Fix chatbot auto-scroll when AI coach generates streaming text:

    • Proper scroll handling
    • Better user experience

  • Match chat box height to calendar height using ResizeObserver:

    • Better layout
    • Improved design

  • Fix chat box scrollbar visibility and prevent overflow past calendar:

    • Better visual design
    • Improved UX

UI Improvements

Workout Display

  • Remove description text from workout title display:
    • Clean workout titles to show only activity type
    • Without warm up/cool down descriptions in calendar cards and modal
    • Cleaner interface

Code Fixes

TypeScript & Errors

  • Fix TypeScript type error in getGarminAccessToken function:

    • Proper type handling
    • Better code quality

  • Fix TypeScript error: Use correct variable names in error logging:

    • Proper variable usage
    • Better code quality

  • Fix TypeScript error: Move useEffect after workoutsLoading and itemsByDate declarations:

    • Proper hook ordering
    • Better code quality

  • Fix syntax error: remove duplicate content in systemPrompt.ts:

    • Code cleanup
    • Better code quality

🚧 In Progress

  • Garmin OAuth integration (core implementation complete, additional refinements planned)
  • Garmin API (fixes complete, additional compatibility improvements planned)
  • AI Coach refactoring (modular structure complete, additional improvements planned)

🎯 Targets for Tomorrow

  1. Continue Garmin integration — additional API improvements and testing
  2. Enhance AI Coach — additional modular improvements
  3. Improve chat — additional UX enhancements

🤔 Notes / Observations

  • Major Garmin OAuth integration provides secure authentication
  • Garmin API fixes improve compatibility and reliability
  • AI Coach refactoring improves code organization
  • Chat improvements enhance user experience
  • Strong progress on Garmin integration and code quality

📈 Momentum Score: 9.0 / 10

Exceptional day with major Garmin OAuth integration. Secure OAuth implementation replaces insecure password auth. Garmin API fixes significantly improve compatibility. AI Coach refactoring improves code organization. Chat improvements enhance UX. Outstanding progress on Garmin integration and platform connectivity.