# 代办事项时序图

## 1. 代办列表查询流程

```mermaid
sequenceDiagram
    participant FE as 前端 TodoPanel
    participant API as GET /api/todo-items
    participant Agg as TodoAggregatorService
    participant Cache as Redis Cache
    participant Appr as ApprovalTodoService
    participant Wecom as 企微审批API
    participant ITSM as ITSMService
    participant ITSM_API as ITSM OpenAPI

    FE->>API: GET /api/todo-items?type=approval
    API->>Agg: get_todo_list(agent_userid, type="approval")
    Agg->>Cache: GET todo:cache:{userid}:approval
    alt 缓存命中
        Cache-->>Agg: cached_data
        Agg-->>API: {items, total, cached:true}
    else 缓存未命中
        Agg->>Agg: asyncio.gather(approval_svc, itsm_svc, return_exceptions=True)
        par 并行查询审批
            Agg->>Appr: get_todo_list()
            Appr->>Wecom: getapprovaldata(sp_status=1, templates=18)
            Wecom-->>Appr: sp_no_list
            Appr->>Appr: asyncio.gather(getapprovaldetail × N)
            loop 每个sp_no并发获取详情
                Appr->>Wecom: getapprovaldetail(sp_no)
                Wecom-->>Appr: approval_detail
            end
            Appr->>Appr: _filter_by_current_approver(details)
            Appr->>Appr: _map_to_todo_item(detail)
            Appr-->>Agg: List[TodoItemData]
        and 并行查询工单
            Agg->>ITSM: get_todo_list()
            Note over ITSM: ITSM列表API待实现<br/>当前返回空列表+日志告警
            ITSM-->>Agg: List[TodoItemData] (空)
        end
        Agg->>Agg: merge + sort by priority
        Agg->>Cache: SET todo:cache:{userid}:approval TTL=45s
        Agg-->>API: {items, total, cached:false}
    end
    API-->>FE: {code:0, data:{items, total}}
```

## 2. 代办详情查询流程

```mermaid
sequenceDiagram
    participant FE as 前端 TaskDetailView
    participant API as GET /api/todo-items/{id}
    participant Agg as TodoAggregatorService
    participant Appr as ApprovalTodoService
    participant ITSM as ITSMService
    participant Wecom as 企微审批API
    participant ITSM_API as ITSM OpenAPI

    FE->>API: GET /api/todo-items/approval:{sp_no}
    API->>Agg: get_todo_detail(agent_userid, item_id, todo_type="approval")
    
    alt type == "approval"
        Agg->>Appr: get_todo_detail(sp_no)
        Appr->>Wecom: getapprovaldetail(sp_no)
        Wecom-->>Appr: approval_detail
        Appr->>Appr: _map_to_todo_item(detail)
        Appr-->>Agg: TodoItemData
    else type == "ticket"
        Agg->>ITSM: get_todo_detail(workitem_id)
        ITSM->>ITSM_API: POST /openapi/v1/process/workitem/detail
        ITSM_API-->>ITSM: {code:20000, data:{workitem_detail}}
        ITSM->>ITSM: _map_to_todo_item(detail)
        ITSM-->>Agg: TodoItemData
    end
    
    Agg-->>API: TodoItemData
    API-->>FE: {code:0, data:{item}}
```

## 3. ITSM 签名认证流程

```mermaid
sequenceDiagram
    participant Svc as ITSMService
    participant Signer as ITSMSigner
    participant API as ITSM OpenAPI

    Svc->>Svc: timestamp = str(int(time.time()*1000))
    Svc->>Signer: compute_signature(app_id, timestamp, app_secret, biz_data)
    Signer->>Signer: sign_params = {appId, timestamp, appSecret, bizData}
    Signer->>Signer: sort by key ASC
    Signer->>Signer: concat all values → canonicalized_str
    Signer->>Signer: quote_plus(canonicalized_str)
    Signer->>Signer: sha1(q2).hexdigest().upper()
    Signer-->>Svc: sign_str
    Svc->>API: POST url, headers={appId, timestamp, sign}, json=body
    API-->>Svc: {code:20000, data:{...}}
```