import { workflowApi } from '../../api'
import { state, _eventUnlisten, setEventUnlisten } from './state'

/**
 * 工作流 + 审批子 store(共享全局 state)。
 *
 * 越层 invoke(approve_human_approval / cancel_workflow_node) 已下沉到
 * src/api/workflow.ts,本子 store 不再直接 invoke IPC。
 */
export function createWorkflowStore() {
  async function runWorkflow(name: string, dag: unknown, config?: Record<string, unknown>) {
    return await workflowApi.run(name, dag, config)
  }

  async function loadWorkflowExecutions() {
    try {
      state.workflowExecutions = await workflowApi.listExecutions()
    } catch (e: any) {
      state.error = e?.toString() ?? '加载工作流记录失败'
    }
  }

  async function startEventListener() {
    if (_eventUnlisten) return _eventUnlisten
    const unlisten = await workflowApi.onEvent((payload) => {
      try {
        // 固时间戳(FR-C1):formattedEvents computed 重算时用事件发生时刻,非当前时刻
        state.liveEvents.push({ ...payload, _ts: Date.now() })
        // 限长(FR-R3):防 liveEvents 无限增长撑爆内存,保留最近 200 条
        if (state.liveEvents.length > 200) {
          state.liveEvents.splice(0, state.liveEvents.length - 200)
        }
        // 处理人工审批请求
        // WorkflowEvent serde tag=type rename_all=snake_case → type='human_approval_request'，字段扁平(无 data 包装)(B-03b-R7)
        if (payload.event?.type === 'human_approval_request') {
          state.pendingApproval = payload.event as unknown as typeof state.pendingApproval
        }
      } catch (e) {
        console.error('处理工作流事件失败:', e, payload)
      }
    })
    setEventUnlisten(unlisten)
    return unlisten
  }

  function clearLiveEvents() {
    state.liveEvents = []
  }

  /**
   * 发送审批响应。
   *
   * 统一以 decisions 数组表达选择,按 pendingApproval.select_type 判定单/多选:
   * - 单选(select_type='single' 或缺省):取 decisions[0] 作为后端 decision 单值;
   * - 多选(select_type='multiple'):decisions 透传全量。
   *
   * CR-11⑪:签名保持 approveHumanApproval(decisions: string[], comment?)。
   * F-260615-01: decisions/select_type 透传,与后端 IPC 签名对齐。
   */
  async function approveHumanApproval(
    decisions: string[],
    comment?: string,
  ) {
    if (!state.pendingApproval) return
    const selectType = state.pendingApproval.select_type ?? 'single'
    // CR-260615-18:删死逻辑三元(原 selectType 多/单分支返回值相同)
    // 单选取首项(后端 decision 单值);多选 decision 取首项占位(后端按 decisions 走)
    const decision = decisions[0] ?? ''

    try {
      // R-PD-5: 透传 options 闭环后端校验(options 非空时 decision 必须 ∈ options,否则 IPC 报错)。
      // options 来自已收到的 HumanApprovalRequest 事件 payload(IPC 无法访问节点 config)。
      // B-260615-34:snake_case 由 api 层对齐后端 workflow.rs:211
      await workflowApi.approveHumanApproval({
        execution_id: state.pendingApproval.execution_id,
        node_id: state.pendingApproval.node_id,
        decision,
        comment,
        options: state.pendingApproval.options ?? [],
        decisions,
        select_type: selectType,
      })

      // 清除待审批状态
      state.pendingApproval = null
    } catch (error) {
      console.error('审批失败:', error)
    }
  }

  /** 取消当前待审批节点（调 cancel_workflow_node IPC 置节点 Cancelled） */
  async function cancelHumanApproval() {
    if (!state.pendingApproval) return

    try {
      await workflowApi.cancelHumanApproval({
        execution_id: state.pendingApproval.execution_id,
        node_id: state.pendingApproval.node_id,
      })
      // 清除待审批状态
      state.pendingApproval = null
    } catch (error) {
      console.error('取消审批失败:', error)
    }
  }

  function stopEventListener() {
    if (_eventUnlisten) {
      try {
        _eventUnlisten()
      } catch (e) {
        console.error('停止事件监听失败:', e)
      }
      setEventUnlisten(null)
    }
  }

  return {
    runWorkflow,
    loadWorkflowExecutions,
    startEventListener,
    stopEventListener,
    clearLiveEvents,
    approveHumanApproval,
    cancelHumanApproval,
  }
}