import { memo, useCallback, useEffect, useRef, useState } from 'react'
import { Monitor, Plus } from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { Button } from '@/components/ui/button'
import { hostApi, deploymentApi, collectorApi } from '@/api'
import { PageContainer } from '@/components/PageContainer'
import { LoadingSpinner } from '@/components/LoadingSpinner'
import { EmptyState } from '@/components/EmptyState'
import { ErrorState } from '@/components/ErrorState'
import { PaginationBar } from '@/components/PaginationBar'
import { ConfirmDialog } from '@/components/ConfirmDialog'
import { toast } from 'sonner'
import { useListQuery } from '@/hooks/useListQuery'
import type { Host } from '@/types'
import i18n from '@/i18n'
import zhHosts from '@/i18n/locales/zh/hosts'
import enHosts from '@/i18n/locales/en/hosts'
import { HostCard } from './components/HostCard'
import { HostFormDialog } from './components/HostFormDialog'
import { HostDetailDialog } from './components/HostDetailDialog'

// 注册本域命名空间（i18n/index.ts 只负责 common，域词典就近注册；页面为懒加载，渲染前必然已注册）
i18n.addResourceBundle('zh', 'hosts', zhHosts)
i18n.addResourceBundle('en', 'hosts', enHosts)

/**
 * 主机管理页 — 只做编排：数据走 useListQuery（取消+版本号），
 * 卡片/表单/详情/删除确认均为域内子组件。成功操作静默（列表刷新即反馈）。
 */
const HostsPage = memo(function HostsPage() {
  const { t } = useTranslation('hosts')
  const query = useListQuery<Host>((params, signal) =>
    hostApi.list(params, { signal })
  )

  const [formOpen, setFormOpen] = useState(false)
  const [detailHost, setDetailHost] = useState<Host | null>(null)
  const [deleteTarget, setDeleteTarget] = useState<Host | null>(null)
  const [editingTarget, setEditingTarget] = useState<Host | null>(null)
  const [deleting, setDeleting] = useState(false)
  const [validating, setValidating] = useState<number | null>(null)

  // 验证后延时刷新列表的定时器（卸载清理）
  const timeoutsRef = useRef<ReturnType<typeof setTimeout>[]>([])
  useEffect(() => {
    const timers = timeoutsRef.current
    return () => {
      timers.forEach((id) => clearTimeout(id))
    }
  }, [])

  const [refCount, setRefCount] = useState<{ dep: number; col: number }>({ dep: 0, col: 0 })
  useEffect(() => {
    if (!deleteTarget) return
    Promise.all([
      deploymentApi.list({ page: 1, pageSize: 100 }),
      collectorApi.list({ page: 1, pageSize: 100 }),
    ]).then(([d, c]) => {
      setRefCount({
        dep: d.list.filter((x) => x.hostID === deleteTarget.id).length,
        col: c.list.filter((x) => x.hostID === deleteTarget.id).length,
      })
    }).catch(() => setRefCount({ dep: 0, col: 0 }))
  }, [deleteTarget])

  const handleDelete = useCallback(async () => {
    const id = deleteTarget?.id
    if (!id) return
    setDeleting(true)
    try {
      await hostApi.remove(id)
      setDeleteTarget(null)
      query.refresh()
    } catch (err) {
      toast.error(err instanceof Error ? err.message : t('toast.deleteFailed'))
    } finally {
      setDeleting(false)
    }
  }, [deleteTarget, query, t])

  const handleValidate = useCallback(
    async (id: number) => {
      setValidating(id)
      try {
        await hostApi.validate(id)
        timeoutsRef.current.push(setTimeout(() => query.refresh(), 3000))
      } catch (err) {
        toast.error(err instanceof Error ? err.message : t('toast.validateFailed'))
      } finally {
        timeoutsRef.current.push(setTimeout(() => setValidating(null), 3000))
      }
    },
    [query, t]
  )

  return (
    <PageContainer
      title={t('title')}
      description={t('description')}
      action={
        <Button onClick={() => setFormOpen(true)}>
          <Plus className="w-4 h-4 mr-1" />
          {t('actions.add')}
        </Button>
      }
    >
      {query.loading ? (
        <LoadingSpinner className="h-64" />
      ) : query.error ? (
        <ErrorState message={query.error} onRetry={query.refresh} />
      ) : query.list.length === 0 ? (
        <EmptyState
          icon={Monitor}
          title={t('empty.title')}
          description={t('empty.description')}
        />
      ) : (
        <>
          <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
            {query.list.map((host) => (
              <HostCard
                key={host.id}
                host={host}
                validating={validating}
                onViewInfo={setDetailHost}
                onValidate={handleValidate}
                onDelete={setDeleteTarget}
              onEdit={setEditingTarget}
              />
            ))}
          </div>
          <PaginationBar
            page={query.page}
            pageSize={query.pageSize}
            total={query.total}
            onPageChange={query.setPage}
          />
        </>
      )}

      <HostFormDialog
        open={formOpen || editingTarget !== null}
        onOpenChange={(o) => {
          if (!o) {
            setFormOpen(false)
            setEditingTarget(null)
          }
        }}
        onCreated={() => (editingTarget ? query.refresh() : query.reload())}
        editing={editingTarget}
      />

      <HostDetailDialog
        key={detailHost?.id ?? 'none'}
        host={detailHost}
        onClose={() => setDetailHost(null)}
      />

      <ConfirmDialog
        open={deleteTarget !== null}
        onOpenChange={(open) => {
          if (!open) setDeleteTarget(null)
        }}
        name={deleteTarget?.name}
        loading={deleting}
        description={
          refCount.dep + refCount.col > 0
            ? t('delete.warning', {
                name: deleteTarget?.name ?? '',
                dep: refCount.dep,
                col: refCount.col,
              })
            : undefined
        }
        onConfirm={handleDelete}
      />
    </PageContainer>
  )
})

export default HostsPage