@startuml
!theme mono

title 대시보드 조회 내부 시퀀스 (AFR-USER-020)

participant "API Gateway<<E>>" as Gateway
participant "UserController" as Controller
participant "DashboardService" as Service
participant "MeetingClient" as MeetingClient
participant "TodoClient" as TodoClient
participant "UserRepository" as Repository
database "PostgreSQL<<E>>" as DB
database "Redis Cache<<E>>" as Cache

Gateway -> Controller: GET /api/v1/dashboard\nAuthorization: Bearer {token}
activate Controller

Controller -> Service: getDashboard(userId)
activate Service

Service -> Cache: get("dashboard:" + userId)
note right
  캐시 조회:
  - Key: dashboard:{userId}
  - TTL: 5분
end note

alt 캐시 존재
    Cache --> Service: cached dashboard data

    Service --> Controller: DashboardResponse
    deactivate Service

    Controller --> Gateway: 200 OK\n{dashboard data}
    deactivate Controller

else 캐시 미존재
    Cache --> Service: null

    par 병렬 데이터 조회
        Service -> MeetingClient: getUpcomingMeetings(userId)
        activate MeetingClient
        note right
          Meeting Service API:
          GET /api/v1/meetings/upcoming
          - userId
          - limit: 5
        end note
        MeetingClient --> Service: upcoming meetings
        deactivate MeetingClient
    else
        Service -> TodoClient: getPendingTodos(userId)
        activate TodoClient
        note right
          Todo Service API:
          GET /api/v1/todos/pending
          - userId
          - limit: 10
        end note
        TodoClient --> Service: pending todos
        deactivate TodoClient
    else
        Service -> Repository: getRecentActivities(userId)
        activate Repository
        Repository -> DB: SELECT * FROM user_activities\nWHERE user_id = ?\nORDER BY created_at DESC\nLIMIT 10
        DB --> Repository: activities
        Repository --> Service: recent activities
        deactivate Repository
    else
        Service -> Repository: getUserStatistics(userId)
        activate Repository
        Repository -> DB: SELECT\n  COUNT(DISTINCT meeting_id) as total_meetings,\n  COUNT(DISTINCT todo_id) as total_todos,\n  AVG(meeting_duration) as avg_duration\nFROM user_statistics\nWHERE user_id = ?
        DB --> Repository: statistics
        Repository --> Service: user statistics
        deactivate Repository
    end

    Service -> Service: aggregateDashboardData()
    note right
      대시보드 데이터 구성:
      - 예정된 회의 목록
      - 미완료 할일 목록
      - 최근 활동 내역
      - 통계 정보
    end note

    Service -> Service: enrichWithMetadata()
    note right
      메타데이터 추가:
      - 회의 참석자 수
      - 할일 우선순위
      - 활동 타입별 아이콘
    end note

    Service -> Cache: set("dashboard:" + userId, dashboardData, 300)
    note right
      캐시 저장:
      - TTL: 5분 (300초)
      - 자동 만료
    end note
    Cache --> Service: cached

    Service --> Controller: DashboardResponse\n{meetings, todos, activities, stats}
    deactivate Service

    Controller --> Gateway: 200 OK\n{dashboard data}
    deactivate Controller
end

@enduml