'use client'

import React, { useEffect, useState, useCallback, use } from 'react'

interface MonitoringData {
  project_id: string
  deadlines: { date: string; label: string }[]
  summary: {
    active_vulns: number
    critical_vulns: number
    high_vulns: number
    breached_24h_reporting: number
    breached_72h_reporting: number
    sbom_versions: number
    configured_checks: number
  }
  post_market_checklist: { item: string; done: boolean; href_suffix: string }[]
}

export default function MonitoringPage({
  params,
}: {
  params: Promise<{ projectId: string }>
}) {
  const { projectId } = use(params)
  const [data, setData] = useState<MonitoringData | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')

  const load = useCallback(async () => {
    try {
      const res = await fetch(`/api/sdk/v1/cra/projects/${projectId}/monitoring`, {
        headers: { 'X-Tenant-ID': '00000000-0000-0000-0000-000000000001' },
      })
      if (!res.ok) throw new Error(await res.text())
      setData(await res.json())
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Fehler beim Laden')
    } finally {
      setLoading(false)
    }
  }, [projectId])

  useEffect(() => { load() }, [load])

  if (loading) return <div className="min-h-screen bg-gray-50 p-8"><p className="text-gray-500">Laedt...</p></div>
  if (error) return <div className="min-h-screen bg-gray-50 p-8"><p className="text-red-600">{error}</p></div>
  if (!data) return null

  const completeness = data.post_market_checklist.filter(c => c.done).length
  const totalChecks = data.post_market_checklist.length

  return (
    <div className="min-h-screen bg-gray-50 py-8">
      <div className="max-w-5xl mx-auto px-4">
        <div className="mb-6">
          <a href={`/sdk/cra/${projectId}`} className="text-sm text-blue-600 hover:underline">
            &larr; Zurueck zum Projekt
          </a>
          <h1 className="text-2xl font-bold text-gray-900 mt-2">Post-Market Monitoring</h1>
          <p className="text-sm text-gray-600 mt-1">
            CRA-Stichtage + Vuln-Reporting-Compliance + Post-Market-Pflichten.
          </p>
        </div>

        {/* CRA-Stichtage */}
        <div className="bg-white rounded-xl shadow-sm border border-gray-200 p-5 mb-6">
          <h3 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-3">CRA-Stichtage</h3>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-3">
            {data.deadlines.map(d => {
              const target = new Date(d.date).getTime()
              const days = Math.round((target - Date.now()) / 86400000)
              const isPast = days < 0
              const isSoon = days >= 0 && days < 90
              const styles = isPast ? 'bg-gray-100 border-gray-200' :
                isSoon ? 'bg-red-50 border-red-200' :
                days < 365 ? 'bg-orange-50 border-orange-200' :
                'bg-blue-50 border-blue-200'
              return (
                <div key={d.date} className={`rounded-lg border p-4 ${styles}`}>
                  <div className="text-xs text-gray-500">{d.date}</div>
                  <div className="font-semibold text-gray-900 text-sm mt-0.5">{d.label}</div>
                  <div className="text-xs mt-1 text-gray-700">
                    {isPast ? `vor ${-days} Tagen` : `noch ${days} Tage`}
                  </div>
                </div>
              )
            })}
          </div>
        </div>

        {/* Vuln-Reporting Compliance Banner */}
        {(data.summary.breached_24h_reporting > 0 || data.summary.breached_72h_reporting > 0) && (
          <div className="bg-red-50 border-2 border-red-300 rounded-xl p-5 mb-6">
            <h3 className="text-sm font-bold text-red-900 uppercase tracking-wide mb-2">⚠ CRA-Pflichten verletzt</h3>
            {data.summary.breached_24h_reporting > 0 && (
              <p className="text-sm text-red-800">
                <span className="font-semibold">{data.summary.breached_24h_reporting}</span> Schwachstelle(n) ohne 24h-Fruehwarnung an ENISA — Art. 14(2)(a) CRA.
              </p>
            )}
            {data.summary.breached_72h_reporting > 0 && (
              <p className="text-sm text-red-800 mt-1">
                <span className="font-semibold">{data.summary.breached_72h_reporting}</span> Schwachstelle(n) ohne 72h-Detailbericht — Art. 14(2)(b) CRA.
              </p>
            )}
            <a href={`/sdk/cra/${projectId}/vuln`} className="inline-block mt-2 text-sm text-red-700 underline font-medium">
              Zu den Schwachstellen →
            </a>
          </div>
        )}

        {/* Summary Cards */}
        <div className="grid grid-cols-2 md:grid-cols-4 gap-3 mb-6">
          <SummaryCard label="Aktive Vulns" value={data.summary.active_vulns} subtitle={`${data.summary.critical_vulns} Critical · ${data.summary.high_vulns} High`} color="blue" />
          <SummaryCard label="SBOM-Versionen" value={data.summary.sbom_versions} subtitle={data.summary.sbom_versions === 0 ? 'noch keine' : 'hochgeladen'} color={data.summary.sbom_versions > 0 ? 'green' : 'gray'} />
          <SummaryCard label="Aktive Checks" value={data.summary.configured_checks} subtitle={data.summary.configured_checks === 0 ? 'init noetig' : 'konfiguriert'} color={data.summary.configured_checks > 0 ? 'green' : 'gray'} />
          <SummaryCard label="Post-Market" value={`${completeness}/${totalChecks}`} subtitle="erfuellt" color={completeness === totalChecks ? 'green' : 'orange'} />
        </div>

        {/* Post-Market Checklist */}
        <div className="bg-white rounded-xl shadow-sm border border-gray-200 p-5 mb-6">
          <h3 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-3">Post-Market-Pflichten</h3>
          <ul className="space-y-2">
            {data.post_market_checklist.map((c, i) => (
              <li key={i} className="flex items-center gap-3">
                <span className={`w-5 h-5 rounded-full flex items-center justify-center text-xs flex-shrink-0 ${
                  c.done ? 'bg-green-500 text-white' : 'bg-gray-200 text-gray-400'
                }`}>
                  {c.done ? '✓' : '○'}
                </span>
                <span className={`text-sm ${c.done ? 'text-gray-700' : 'text-gray-900 font-medium'}`}>{c.item}</span>
                {!c.done && (
                  <a
                    href={`/sdk/cra/${projectId}/${c.href_suffix}`}
                    className="ml-auto text-xs text-blue-600 hover:underline"
                  >
                    Erledigen →
                  </a>
                )}
              </li>
            ))}
          </ul>
        </div>

        <div className="bg-blue-50 border border-blue-200 rounded-xl p-4 text-sm text-blue-900">
          <strong>Hinweis:</strong> Diese Seite aggregiert CRA-Pflichten aus SBOM, Checks und Vulnerability-Tracker. Die Reporting-Pflichten 24h/72h gelten ab CRA Art. 14(2) — verletzte Fristen erscheinen als rotes Banner.
        </div>
      </div>
    </div>
  )
}

function SummaryCard({ label, value, subtitle, color }: { label: string; value: number | string; subtitle: string; color: 'blue' | 'red' | 'green' | 'orange' | 'gray' }) {
  const bg = {
    blue: 'bg-blue-50 border-blue-200 text-blue-700',
    red: 'bg-red-50 border-red-200 text-red-700',
    green: 'bg-green-50 border-green-200 text-green-700',
    orange: 'bg-orange-50 border-orange-200 text-orange-700',
    gray: 'bg-gray-50 border-gray-200 text-gray-600',
  }[color]
  return (
    <div className={`rounded-xl border p-3 ${bg}`}>
      <p className="text-xs uppercase tracking-wide">{label}</p>
      <p className="text-2xl font-bold mt-1">{value}</p>
      <p className="text-xs mt-0.5 opacity-80">{subtitle}</p>
    </div>
  )
}