Claude Code session for PR #48 - Phase 2 Training Plan Generation

claude-session-summary.md

Claude Code Session Summary

PR: Phase 2: Training Plan Generation (#48)

Issues Addressed

• Issue #14: Plan CRUD API Endpoints
• Issue #15: Structured Output Prompting for Plan Generation
• Issue #16: Plan Calendar View
• Issue #17: Session Detail Cards
• Issue #18: Plan Modification via Chat

Changes Made

Backend (main.go)

• Added plan CRUD routes: POST/GET /api/plans, GET/PUT/DELETE /api/plans/:id
• Added plan generation endpoint: POST /api/generate-plan
• Implemented structured output prompting with detailed JSON schema for Claude
• Extended chat endpoint to support plan modification via active_plan field
• Added extractModifiedPlan helper for parsing plan modifications from chat
• Updated CORS middleware to allow PUT/DELETE methods

Frontend (public/index.html)

• Added tabbed interface: Chat, Generate Plan, My Plans
• Implemented plan generation form with goal, race date, duration selection
• Created plan list view with summary cards
• Built calendar view with 7-day grid and week navigation
• Added color-coded session cards by type (easy_run, long_run, speed_work, etc.)
• Implemented modal for full session details
• Added plan selector in chat tab for modification mode
• Added pending modification UI with apply/discard actions

Files Modified

• main.go - Backend API endpoints and handlers for plan management
• public/index.html - Frontend UI components for calendar, cards, and chat integration

Data Models

type Plan struct {
    ID        string  `json:"id"`
    UserID    string  `json:"user_id"`
    Name      string  `json:"name"`
    Goal      string  `json:"goal"`
    StartDate string  `json:"start_date"`
    EndDate   string  `json:"end_date"`
    Weeks     []Week  `json:"weeks"`
    CreatedAt string  `json:"created_at"`
    UpdatedAt string  `json:"updated_at"`
}

type Week struct {
    WeekNumber int       `json:"week_number"`
    Focus      string    `json:"focus"`
    Sessions   []Session `json:"sessions"`
}

type Session struct {
    Day         string `json:"day"`
    Type        string `json:"type"`
    Duration    string `json:"duration"`
    Distance    string `json:"distance,omitempty"`
    Description string `json:"description"`
    Goals       string `json:"goals"`
}

Testing Notes

• Network issues prevented full go build verification during session
• Used gofmt to verify Go syntax correctness
• Frontend changes verified through code review

Technical Decisions

1. Used ===MODIFIED_PLAN_JSON=== markers for plan extraction from chat responses
2. Used claude-sonnet-4-20250514 model for plan modification (larger context)
3. Stored plans in memory map with session-based user authentication
4. Session types: easy_run, long_run, speed_work, tempo_run, rest, cross_training, race