/**
 * useErrors - Sentry Error Data Hook
 * ===================================
 * Phase 10: Sentry + OpenClaw + UI 整合 (#41-44)
 *
 * 提供錯誤數據的 React Hook:
 * - 統計概覽
 * - 問題列表
 * - 趨勢數據
 *
 * 建立: 2026-03-26 (台北時區)
 * 建立者: Claude Code (#44 Error UI)
 */

import { useState, useEffect, useCallback } from 'react'
import {
  apiClient,
  type ErrorStatsResponse,
  type ErrorTrendResponse,
  type SentryIssue,
} from '@/lib/api-client'

// =============================================================================
// Types
// =============================================================================

interface UseErrorsState {
  stats: ErrorStatsResponse | null
  issues: SentryIssue[]
  trends: ErrorTrendResponse | null
  loading: boolean
  error: string | null
  activePeriod: '24h' | '7d' | '30d'
}

interface UseErrorsReturn extends UseErrorsState {
  refetch: () => Promise<void>
  setPeriod: (period: '24h' | '7d' | '30d') => void
}

// =============================================================================
// Hook
// =============================================================================

export function useErrors(): UseErrorsReturn {
  const [state, setState] = useState<UseErrorsState>({
    stats: null,
    issues: [],
    trends: null,
    loading: true,
    error: null,
    activePeriod: '24h',
  })

  const fetchData = useCallback(async (period: '24h' | '7d' | '30d' = '24h') => {
    setState((prev) => ({ ...prev, loading: true, error: null }))

    try {
      const [statsResult, issuesResult, trendsResult] = await Promise.allSettled([
        apiClient.getErrorStats(),
        apiClient.listErrors({ limit: 10 }),
        apiClient.getErrorTrends(period),
      ])

      setState((prev) => ({
        ...prev,
        stats: statsResult.status === 'fulfilled' ? statsResult.value : null,
        issues: issuesResult.status === 'fulfilled' ? issuesResult.value.issues : [],
        trends: trendsResult.status === 'fulfilled' ? trendsResult.value : null,
        loading: false,
        error: null,
        activePeriod: period,
      }))
    } catch (err) {
      setState((prev) => ({
        ...prev,
        loading: false,
        error: err instanceof Error ? err.message : 'Failed to fetch error data',
      }))
    }
  }, [])

  const setPeriod = useCallback((period: '24h' | '7d' | '30d') => {
    fetchData(period)
  }, [fetchData])

  const refetch = useCallback(() => {
    return fetchData(state.activePeriod)
  }, [fetchData, state.activePeriod])

  // Initial fetch
  useEffect(() => {
    fetchData('24h')
  }, [fetchData])

  // Auto-refresh every 60 seconds
  useEffect(() => {
    const interval = setInterval(() => {
      fetchData(state.activePeriod)
    }, 60000)

    return () => clearInterval(interval)
  }, [fetchData, state.activePeriod])

  return {
    ...state,
    refetch,
    setPeriod,
  }
}