@startuml 회의종료및Todo추출
!theme mono

title 회의 종료 및 Todo 추출 플로우 (UFR-MEET-040/050, UFR-AI-020, UFR-TODO-010)

actor "사용자" as User
participant "Frontend" as FE
participant "API Gateway" as GW
participant "Meeting Service" as MS
participant "AI Service" as AI
participant "Todo Service" as TS
participant "Notification Service" as NS
participant "Redis" as Cache
database "Meeting DB" as MDB
database "AI DB" as AIDB
database "Todo DB" as TODB
queue "RabbitMQ" as MQ
participant "LLM Server" as LLM

== 회의 종료 ==
User -> FE: 회의 종료 버튼 클릭
activate FE

FE -> GW: POST /api/meetings/{meetingId}/end
activate GW

GW -> MS: 회의 종료 요청
activate MS

MS -> MDB: UPDATE meetings\nSET end_time = NOW(), status = 'completed'\n통계 생성 (duration, 참석자 수, 발언 수)
activate MDB
MDB --> MS: 회의 종료 시간 기록 및 통계 생성 완료
deactivate MDB

MS ->> MQ: MeetingEnded 이벤트 발행\n{meetingId, sessionId, endTime, statistics}
activate MQ
note right of MQ
  이벤트: MeetingEnded
  Routing Key: meeting.ended
end note
MQ -->> MS: ACK
deactivate MQ

MS --> GW: 200 OK\n{status: "completed", statistics}
deactivate MS

GW --> FE: 회의 종료 확인
deactivate GW

FE --> User: 회의 종료 화면 표시
deactivate FE

== AI Todo 자동 추출 (비동기) ==
MQ ->> AI: MeetingEnded 이벤트 전달
activate AI
note right of AI
  구독: meeting.ended
  큐: ai.meeting.ended
end note

AI -> AIDB: SELECT transcript, summary\nFROM minutes_draft\nWHERE session_id = {sessionId}
activate AIDB
AIDB --> AI: 회의록 전체 내용 반환
deactivate AIDB

AI -> AI: 액션 아이템 식별\n(동사 패턴, 시간 표현, 담당자 언급)
AI -> LLM: Todo 추출 요청\n{transcript, context, attendees}
activate LLM
LLM --> AI: Todo 목록 반환\n{tasks: [{description, assignee, dueDate, priority, linkedSection}]}
deactivate LLM

AI -> AIDB: UPDATE minutes_draft\nSET todos_extracted = TRUE\n(Todo 추출 완료 표시)
activate AIDB
AIDB --> AI: OK
deactivate AIDB

AI ->> MQ: TodoExtracted 이벤트 발행\n{meetingId, todos: [{description, assignee, dueDate, priority, linkedSection}]}
activate MQ
note right of MQ
  이벤트: TodoExtracted
  Routing Key: todo.extracted
end note
MQ -->> AI: ACK
deactivate MQ

AI -->> MQ: ACK (MeetingEnded)
deactivate AI

== Todo 생성 및 할당 (비동기) ==
MQ ->> TS: TodoExtracted 이벤트 전달
activate TS
note right of TS
  구독: todo.extracted
  큐: todo.extracted
end note

loop 각 Todo
    TS -> TODB: INSERT INTO todos\n(Todo 생성, 담당자 할당, 회의록 섹션 링크)
    activate TODB
    TODB --> TS: Todo ID 반환
    deactivate TODB

    TS -> Cache: SET todo:list:{userId}\n(사용자별 Todo 목록 캐싱, TTL: 5분)
    activate Cache
    Cache --> TS: OK
    deactivate Cache

    TS ->> MQ: TodoCreated 이벤트 발행\n{todoId, assignee, description, dueDate, linkedSection}
    activate MQ
    note right of MQ
      이벤트: TodoCreated
      Routing Key: todo.created
    end note
    MQ -->> TS: ACK
    deactivate MQ
end

TS -->> MQ: ACK (TodoExtracted)
deactivate TS

== Todo 할당 알림 (비동기) ==
MQ ->> NS: TodoCreated 이벤트 전달
activate NS
note right of NS
  구독: todo.created
  큐: notification.todo.created
end note

NS -> NS: 알림 템플릿 생성\n(Todo 설명, 기한, 회의록 링크)
NS -> NS: 담당자에게 알림 발송\n(이메일, 푸시 알림)

NS -->> MQ: ACK
deactivate NS

== 회의 통계 및 Todo 목록 조회 ==
User -> FE: 회의 상세 화면 조회
activate FE

FE -> GW: GET /api/meetings/{meetingId}/summary
activate GW

GW -> MS: 회의 통계 및 Todo 목록 조회
activate MS

MS -> Cache: GET meeting:info:{meetingId}
activate Cache

alt Cache Hit
    Cache --> MS: 회의 정보 반환
else Cache Miss
    Cache --> MS: null
    MS -> MDB: SELECT * FROM meetings\nWHERE meeting_id = {meetingId}
    activate MDB
    MDB --> MS: 회의 정보 반환
    deactivate MDB

    MS -> Cache: SET meeting:info:{meetingId}\n(TTL: 10분)
    Cache --> MS: OK
end
deactivate Cache

MS -> TS: GET /api/todos?meetingId={meetingId}
activate TS

TS -> Cache: GET todo:list:meeting:{meetingId}
activate Cache

alt Cache Hit
    Cache --> TS: Todo 목록 반환
else Cache Miss
    Cache --> TS: null
    TS -> TODB: SELECT * FROM todos\nWHERE meeting_id = {meetingId}
    activate TODB
    TODB --> TS: Todo 목록 반환
    deactivate TODB

    TS -> Cache: SET todo:list:meeting:{meetingId}\n(TTL: 5분)
    Cache --> TS: OK
end
deactivate Cache

TS --> MS: Todo 목록 반환
deactivate TS

MS --> GW: 회의 통계 및 Todo 목록 반환\n{statistics, todos}
deactivate MS

GW --> FE: 200 OK
deactivate GW

FE --> User: 회의 통계 및 Todo 목록 표시
deactivate FE

@enduml