Course Materials RAG System

graph TB
    subgraph FRONTEND["Frontend (Static HTML/CSS/JS)"]
        UI["Chat Interface<br/><i>index.html + style.css + script.js</i>"]
    end

    subgraph SERVER["FastAPI Server — app.py (port 8000)"]
        API_Q["POST /api/query"]
        API_C["GET /api/courses"]
        STATIC["/ → static files"]
    end

    subgraph BACKEND["Backend Components"]
        RAG["RAGSystem<br/><i>rag_system.py</i>"]
        DP["DocumentProcessor<br/><i>document_processor.py</i>"]
        VS["VectorStore<br/><i>vector_store.py</i>"]
        AI["AIGenerator<br/><i>ai_generator.py</i>"]
        SM["SessionManager<br/><i>session_manager.py</i>"]
        TM["ToolManager + CourseSearchTool<br/><i>search_tools.py</i>"]
    end

    subgraph EXTERNAL["External Services & Storage"]
        CLAUDE["Claude API<br/><i>claude-sonnet-4-20250514</i>"]
        CHROMA[("ChromaDB<br/><i>course_catalog<br/>course_content</i>")]
        DOCS["docs/<br/><i>course1-4_script.txt</i>"]
    end

    UI -- "HTTP requests" --> API_Q
    UI -- "HTTP requests" --> API_C
    API_Q --> RAG
    API_C --> RAG
    STATIC -. "serves" .-> UI

    RAG --> DP
    RAG --> VS
    RAG --> AI
    RAG --> SM
    RAG --> TM

    AI -- "API calls" --> CLAUDE
    VS -- "read/write" --> CHROMA
    DP -- "reads" --> DOCS
    TM -- "delegates search" --> VS