import { defineStore } from 'pinia'
import { ref } from 'vue'
import { applicationApi } from '../api/application'
import { useOrganizationStore } from './organization'
import {
  captureOrganizationContext,
  isCurrentOrganizationContext,
  shouldDiscardResponse
} from '../utils/organizationContext'

export const useApplicationStore = defineStore('application', () => {
  const myApplications = ref([])
  const loading = ref(false)
  const myPage = ref({ currentPage: 1, pageSize: 20, total: 0, totalPages: 0 })

  // 列表当前生效的筛选条件。取消申请后会在原地重新拉取列表，那次拉取必须沿用
  // 用户选中的状态，否则列表会悄悄退回全量，而下拉框里还显示着选中的筛选值。
  const filters = ref({ status: '' })

  async function fetchMyApplications(status = '', pageNum = 1) {
    filters.value = { status }
    // 捕获发起时的公司上下文快照：响应回来时用它判断是否已被切换作废。
    const snapshot = captureOrganizationContext()
    loading.value = true
    try {
      const res = await applicationApi.getMy(status, pageNum, myPage.value.pageSize)
      if (!isCurrentOrganizationContext(snapshot)) return
      myApplications.value = res.data?.items || res.data || []
      myPage.value.total = res.data?.total || myApplications.value.length
      myPage.value.currentPage = pageNum
      myPage.value.totalPages = Math.ceil(myPage.value.total / myPage.value.pageSize) || 1
    } catch (error) {
      if (shouldDiscardResponse(error)) return
      throw error
    } finally {
      if (isCurrentOrganizationContext(snapshot)) loading.value = false
    }
  }

  async function createApplication(data) {
    const organization = useOrganizationStore()
    organization.beginSaving()
    try {
      const res = await applicationApi.create(data)
      // 这处刻意清空筛选并回到第 1 页，和上面「沿用筛选」的规矩相反：刚提交的是
      // 待审批单，若沿用「已通过」之类的筛选就看不见它，用户会以为没提交成功。
      // 清空的是 store 这份状态，页面那份（下拉框）由 Application.vue 同步重置。
      await fetchMyApplications('', 1)
      return res
    } finally {
      organization.endSaving()
    }
  }

  async function cancelApplication(id) {
    const organization = useOrganizationStore()
    organization.beginSaving()
    try {
      const res = await applicationApi.cancel(id)
      await fetchMyApplications(filters.value.status, myPage.value.currentPage)
      return res
    } finally {
      organization.endSaving()
    }
  }

  // 公司范围变更时清空共享缓存：我的申请、筛选、分页与加载态。
  function resetForOrganization() {
    myApplications.value = []
    loading.value = false
    myPage.value = { currentPage: 1, pageSize: 20, total: 0, totalPages: 0 }
    filters.value = { status: '' }
  }

  useOrganizationStore().registerOrganizationReset(resetForOrganization)

  return {
    myApplications, loading, myPage,
    fetchMyApplications, createApplication, cancelApplication, resetForOrganization
  }
})