/**
 * useDashboardData Hook
 * 
 * 仪表板数据获取Hook
 * 统一管理监控仪表板的数据获取逻辑
 * 包括数据加载、错误处理、刷新等功能
 * 
 * @created 2025-01-XX（从 page.tsx 提取）
 * @hook
 */

'use client'

import { useCallback, useState } from 'react'
import type { DashboardData, ToastFn } from '../_components/types'

type SystemSettingKey = 'registrationEnabled' | 'userActivationRequired'

interface UseDashboardDataOptions {
  showToast?: ToastFn
}

interface RefreshOptions {
  background?: boolean
}

export function useDashboardData({ showToast }: UseDashboardDataOptions = {}) {
  const [data, setData] = useState<DashboardData | null>(null)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [lastUpdated, setLastUpdated] = useState<number | null>(null)
  const [refreshing, setRefreshing] = useState(false)

  const refresh = useCallback(
    async (options: RefreshOptions = {}) => {
      const { background = false } = options
      if (!background) {
        setLoading(true)
      }
      setRefreshing(true)
      setError(null)
      try {
        const response = await fetch('/api/admin/system-status', { credentials: 'include' })
        if (!response.ok) {
          throw new Error(`HTTP ${response.status}: ${response.statusText}`)
        }
        const payload: DashboardData = await response.json()
        setData(payload)
        setLastUpdated(Date.now())
      } catch (err) {
        console.error('Failed to fetch dashboard data:', err)
        const message = err instanceof Error ? err.message : '获取数据失败'
        setError(message)
      } finally {
        if (!background) {
          setLoading(false)
        }
        setRefreshing(false)
      }
    },
    [],
  )

  const updateSystemSetting = useCallback(
    async (key: SystemSettingKey, value: boolean) => {
      let previousValue: boolean | undefined
      setData((prev) => {
        if (!prev) return prev
        previousValue = prev.systemInfo[key]
        return {
          ...prev,
          systemInfo: {
            ...prev.systemInfo,
            [key]: value,
          },
        }
      })

      try {
        const body =
          key === 'registrationEnabled'
            ? { enableRegistration: value }
            : { enableUserActivation: value }

        const response = await fetch('/api/system-settings', {
          method: 'PUT',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(body),
        })

        if (!response.ok) {
          throw new Error('更新失败')
        }

        showToast?.('设置已更新')
      } catch (err) {
        console.error('Update system setting error:', err)
        setData((prev) => {
          if (!prev) return prev
          return {
            ...prev,
            systemInfo: {
              ...prev.systemInfo,
              [key]: previousValue ?? prev.systemInfo[key],
            },
          }
        })
        showToast?.('更新失败', 'error')
        throw err
      }
    },
    [showToast],
  )

  return {
    data,
    loading,
    error,
    refresh,
    updateSystemSetting,
    lastUpdated,
    refreshing,
  }
}

export type UseDashboardDataReturn = ReturnType<typeof useDashboardData>