'use client'

/**
 * SecurityPanel — 安全監控面板 (不含 AppLayout)
 * Sprint 5R: 從 /security/page.tsx 抽取
 * @updated 2026-07-03 — UI/UX 全面升級，Tailwind + 彩色 Stat Cards + 問題列表
 */

import { useState, useEffect } from 'react'
import { useTranslations } from 'next-intl'
import {
  AlertCircle,
  AlertTriangle,
  Bug,
  CheckCircle2,
  Clock,
  RefreshCw,
  ShieldAlert,
  ShieldCheck,
  XCircle,
} from 'lucide-react'
import { cn } from '@/lib/utils'
import { IwoooSReadOnlyBridge } from '@/components/security/iwooos-read-only-bridge'

const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? ''

interface IssueStats {
  total_issues: number
  unresolved_issues: number
  critical_count: number
  error_count_24h: number
}

interface SentryIssue {
  id: string
  title: string
  culprit: string | null
  level: string
  count: number
  first_seen: string
  last_seen: string
}

const LEVEL_CFG: Record<string, { badge: string; icon: typeof Bug }> = {
  fatal:   { badge: 'bg-[#fff0ed] border-[#f5b8b8] text-[#9f2f25]', icon: XCircle },
  error:   { badge: 'bg-[#fff0ed] border-[#f5b8b8] text-[#9f2f25]', icon: AlertCircle },
  warning: { badge: 'bg-[#fff7e8] border-[#d9b36f] text-[#8a5a08]', icon: AlertTriangle },
  info:    { badge: 'bg-[#f0f6ff] border-[#c7dcf7] text-[#1f5b9b]', icon: Bug },
  debug:   { badge: 'bg-[#f5f4ed] border-[#e0ddd4] text-[#77736a]', icon: Bug },
}

export function SecurityPanel() {
  const t = useTranslations('security')
  const [stats, setStats] = useState<IssueStats | null>(null)
  const [issues, setIssues] = useState<SentryIssue[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  const fetchData = () => {
    setLoading(true)
    setError(null)
    Promise.all([
      fetch(`${API_BASE}/api/v1/errors/stats`).then(r => r.ok ? r.json() : null).catch(() => null),
      fetch(`${API_BASE}/api/v1/errors/issues?limit=20`).then(r => r.ok ? r.json() : { issues: [] }).catch(() => ({ issues: [] })),
    ])
      .then(([statsData, listData]) => {
        if (statsData) setStats(statsData)
        setIssues(listData?.issues ?? [])
      })
      .catch(() => setError('load_failed'))
      .finally(() => setLoading(false))
  }

  useEffect(() => { fetchData() }, []) // eslint-disable-line react-hooks/exhaustive-deps

  const statCards = stats ? [
    {
      label: t('totalIssues'),
      value: stats.total_issues.toLocaleString(),
      icon: Bug,
      accent: 'text-[#141413]',
      bg: 'bg-white',
      border: 'border-[#e0ddd4]',
    },
    {
      label: t('criticalIssues'),
      value: stats.critical_count.toLocaleString(),
      icon: XCircle,
      accent: stats.critical_count > 0 ? 'text-[#9f2f25]' : 'text-[#17602a]',
      bg: stats.critical_count > 0 ? 'bg-[#fff0ed]' : 'bg-[#f0faf2]',
      border: stats.critical_count > 0 ? 'border-[#f5b8b8]' : 'border-[#8fc29a]',
    },
    {
      label: t('unresolvedIssues'),
      value: stats.unresolved_issues.toLocaleString(),
      icon: AlertCircle,
      accent: stats.unresolved_issues > 0 ? 'text-[#8a5a08]' : 'text-[#17602a]',
      bg: stats.unresolved_issues > 0 ? 'bg-[#fff7e8]' : 'bg-[#f0faf2]',
      border: stats.unresolved_issues > 0 ? 'border-[#d9b36f]' : 'border-[#8fc29a]',
    },
    {
      label: t('errorRate'),
      value: stats.error_count_24h != null ? `${stats.error_count_24h}/24h` : '—',
      icon: Clock,
      accent: 'text-[#4A90D9]',
      bg: 'bg-[#f0f6ff]',
      border: 'border-[#c7dcf7]',
    },
  ] : []

  return (
    <div className="min-h-full bg-[#f5f4ed] p-5 lg:p-6">
      {/* Header */}
      <div className="mb-6 flex items-start justify-between gap-3">
        <div>
          <p className="text-[11px] font-semibold uppercase tracking-wider text-[#77736a]">
            Security
          </p>
          <h1 className="mt-1 text-2xl font-bold text-[#141413]">{t('title')}</h1>
          <p className="mt-1 text-sm text-[#77736a]">{t('subtitle')}</p>
        </div>
        <div className="flex items-center gap-2">
          <div className="flex h-10 w-10 items-center justify-center rounded-xl border border-[#e0ddd4] bg-white">
            <ShieldAlert className="h-5 w-5 text-[#d97757]" aria-hidden="true" />
          </div>
          <button
            onClick={fetchData}
            disabled={loading}
            className="inline-flex h-9 w-9 shrink-0 items-center justify-center rounded-lg border border-[#e0ddd4] bg-white text-[#77736a] transition hover:border-[#d97757] hover:text-[#d97757] disabled:opacity-40"
            aria-label="Refresh"
          >
            <RefreshCw className={cn('h-4 w-4', loading && 'animate-spin')} aria-hidden="true" />
          </button>
        </div>
      </div>

      {/* IwoooS Bridge */}
      <div className="mb-4">
        <IwoooSReadOnlyBridge />
      </div>

      {/* Loading */}
      {loading && (
        <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-4">
          {[0,1,2,3].map(i => (
            <div key={i} className="animate-pulse rounded-xl border border-[#e0ddd4] bg-white p-5">
              <div className="mb-3 h-3 w-24 rounded bg-[#e0ddd4]" />
              <div className="h-8 w-16 rounded bg-[#e0ddd4]" />
            </div>
          ))}
        </div>
      )}

      {/* Error */}
      {!loading && error && (
        <div className="flex items-start gap-3 rounded-xl border border-[#f5b8b8] bg-[#fff0ed] p-4">
          <XCircle className="mt-0.5 h-5 w-5 shrink-0 text-[#cc2200]" aria-hidden="true" />
          <p className="font-semibold text-[#141413]">{t('error')}</p>
        </div>
      )}

      {/* Content */}
      {!loading && !error && (
        <div className="grid gap-4">
          {/* Stat cards */}
          {statCards.length > 0 && (
            <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-4">
              {statCards.map(({ label, value, icon: Icon, accent, bg, border }) => (
                <div
                  key={label}
                  className={cn('rounded-xl border p-5 transition hover:shadow-sm', bg, border)}
                >
                  <div className="flex items-center justify-between gap-2">
                    <p className="text-[11px] font-semibold uppercase tracking-wider text-[#77736a]">{label}</p>
                    <Icon className={cn('h-4 w-4 shrink-0', accent)} aria-hidden="true" />
                  </div>
                  <p className={cn('mt-3 font-mono text-3xl font-bold tabular-nums', accent)}>{value}</p>
                </div>
              ))}
            </div>
          )}

          {/* Recent Issues */}
          <div className="overflow-hidden rounded-xl border border-[#e0ddd4] bg-white">
            <div className="flex items-center justify-between gap-2 border-b border-[#e0ddd4] bg-[#faf9f3] px-5 py-3">
              <div className="flex items-center gap-2">
                {issues.length === 0 ? (
                  <ShieldCheck className="h-4 w-4 text-[#17602a]" aria-hidden="true" />
                ) : (
                  <ShieldAlert className="h-4 w-4 text-[#d97757]" aria-hidden="true" />
                )}
                <h2 className="font-semibold text-[#141413]">{t('recentIssues')}</h2>
              </div>
              <span className="rounded-full border border-[#e0ddd4] bg-white px-2.5 py-1 font-mono text-[11px] font-bold text-[#77736a]">
                {issues.length}
              </span>
            </div>

            {issues.length === 0 ? (
              <div className="flex flex-col items-center py-12">
                <ShieldCheck className="h-10 w-10 text-[#22C55E]" aria-hidden="true" />
                <p className="mt-3 font-semibold text-[#17602a]">{t('noData')}</p>
              </div>
            ) : (
              <div className="divide-y divide-[#f5f4ed]">
                {/* Header */}
                <div className="grid grid-cols-[1fr_auto_auto_auto] gap-4 bg-[#faf9f3] px-5 py-2.5">
                  {[t('issue'), t('level'), t('count'), t('lastSeen')].map(col => (
                    <span key={col} className="text-[11px] font-semibold uppercase tracking-wider text-[#77736a]">{col}</span>
                  ))}
                </div>
                {issues.map(issue => {
                  const cfg = LEVEL_CFG[issue.level] ?? LEVEL_CFG['debug']
                  const LvIcon = cfg.icon
                  return (
                    <div
                      key={issue.id}
                      className="grid grid-cols-[1fr_auto_auto_auto] items-center gap-4 px-5 py-3 transition hover:bg-[#faf9f3]"
                    >
                      <div className="min-w-0">
                        <p className="truncate font-medium text-[#141413]">{issue.title}</p>
                        {issue.culprit && (
                          <p className="mt-0.5 truncate font-mono text-[11px] text-[#77736a]">{issue.culprit}</p>
                        )}
                      </div>
                      <span className={cn(
                        'inline-flex items-center gap-1.5 rounded-full border px-2.5 py-1 text-[10px] font-bold uppercase',
                        cfg.badge,
                      )}>
                        <LvIcon className="h-3 w-3" aria-hidden="true" />
                        {issue.level}
                      </span>
                      <span className="font-mono text-sm text-[#77736a]">{issue.count.toLocaleString()}</span>
                      <span className="font-mono text-[11px] text-[#77736a]">
                        {new Date(issue.last_seen).toLocaleString('zh-TW', {
                          timeZone: 'Asia/Taipei',
                          month: 'numeric',
                          day: 'numeric',
                          hour: '2-digit',
                          minute: '2-digit',
                        })}
                      </span>
                    </div>
                  )
                })}
              </div>
            )}
          </div>
        </div>
      )}
    </div>
  )
}