'use client'

import React, { useState } from 'react'
import { ChecklistView } from './ChecklistView'

interface CheckItem {
  id: string
  label: string
  passed: boolean
  severity: string
  matched_text: string
  level?: number
  parent?: string | null
  skipped?: boolean
  hint?: string
}

interface BannerResult {
  banner_detected: boolean
  banner_provider: string
  banner_checks?: {
    violations: { code: string; text: string; severity: string }[]
    has_impressum_link?: boolean
    has_dse_link?: boolean
  }
  structured_checks?: CheckItem[]
  completeness_pct?: number
  correctness_pct?: number
  phases?: {
    before_consent: { cookies: string[]; scripts: string[]; tracking_services: string[]; violations: any[] }
    after_reject: { cookies: string[]; scripts: string[]; new_tracking: string[]; violations: any[] }
    after_accept: { cookies: string[]; scripts: string[]; new_tracking: string[]; undocumented: string[] }
  }
  email_status?: string
}

const CATEGORIES = [
  { id: 'all', label: 'Alle Kategorien' },
  { id: 'necessary', label: 'Notwendig' },
  { id: 'statistics', label: 'Statistik' },
  { id: 'marketing', label: 'Marketing' },
  { id: 'functional', label: 'Funktional' },
  { id: 'preferences', label: 'Praeferenzen' },
]

export function BannerCheckTab() {
  const [url, setUrl] = useState(() =>
    typeof window !== 'undefined' ? localStorage.getItem('banner-check-url') || '' : ''
  )
  const [loading, setLoading] = useState(false)
  const [progress, setProgress] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [result, setResult] = useState<BannerResult | null>(() => {
    if (typeof window === 'undefined') return null
    try { const s = localStorage.getItem('banner-check-result'); return s ? JSON.parse(s) : null } catch { return null }
  })
  const [categories, setCategories] = useState<string[]>(['all'])
  const [useAgent, setUseAgent] = useState(false)
  const [mcResults, setMcResults] = useState<any>(null)
  const [history, setHistory] = useState<{ url: string; date: string; provider: string; violations: number; pct: number; resultKey: string }[]>(() => {
    if (typeof window === 'undefined') return []
    try { return JSON.parse(localStorage.getItem('banner-check-history') || '[]') } catch { return [] }
  })

  // Persist URL
  React.useEffect(() => { localStorage.setItem('banner-check-url', url) }, [url])

  const toggleCategory = (id: string) => {
    if (id === 'all') {
      setCategories(['all'])
      return
    }
    setCategories(prev => {
      const without = prev.filter(c => c !== 'all' && c !== id)
      const next = prev.includes(id) ? without : [...without, id]
      return next.length === 0 ? ['all'] : next
    })
  }

  const handleScan = async (e: React.FormEvent) => {
    e.preventDefault()
    if (!url.trim()) return

    setLoading(true)
    setError(null)
    setResult(null)
    setProgress('Cookie-Banner wird analysiert...')

    const selectedCategories = categories.includes('all') ? [] : categories

    try {
      const res = await fetch('/api/sdk/v1/agent/banner-check', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ url: url.trim(), categories: selectedCategories }),
      })
      if (!res.ok) throw new Error(`Fehler: ${res.status}`)
      const data = await res.json()
      setResult(data)
      localStorage.setItem('banner-check-result', JSON.stringify(data))

      // If agent mode: also run cookie doc-check with 381 MCs
      if (useAgent) {
        setProgress('KI-Agent prueft Cookie-Richtlinie (381 MCs)...')
        try {
          const mcRes = await fetch('/api/sdk/v1/agent/doc-check', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
              entries: [{ doc_type: 'cookie', label: 'Cookie-Richtlinie', url: url.trim() }],
              recipient: 'dsb@breakpilot.local',
              use_agent: true,
            }),
          })
          if (mcRes.ok) {
            const { check_id } = await mcRes.json()
            if (check_id) {
              for (let i = 0; i < 60; i++) {
                await new Promise(r => setTimeout(r, 3000))
                const poll = await fetch(`/api/sdk/v1/agent/doc-check?check_id=${check_id}`)
                if (!poll.ok) continue
                const pd = await poll.json()
                if (pd.progress) setProgress(`KI-Agent: ${pd.progress}`)
                if (pd.status === 'completed' && pd.result) { setMcResults(pd.result); break }
                if (pd.status === 'failed') break
              }
            }
          }
        } catch { /* agent check is optional */ }
      }

      // Add to history with persistent result
      const violations = data.structured_checks?.filter((c: CheckItem) => !c.passed && !c.skipped).length || 0
      const resultKey = `banner-check-result-${Date.now()}`
      try { localStorage.setItem(resultKey, JSON.stringify(data)) } catch { /* quota */ }
      const entry = {
        url: url.trim(),
        date: new Date().toISOString(),
        provider: data.banner_provider || 'Unbekannt',
        violations,
        pct: data.completeness_pct ?? 0,
        resultKey,
      }
      const updated = [entry, ...history].slice(0, 30)
      setHistory(updated)
      localStorage.setItem('banner-check-history', JSON.stringify(updated))
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unbekannter Fehler')
    } finally {
      setLoading(false)
      setProgress('')
    }
  }

  const loadFromHistory = (entry: { url: string; resultKey?: string }) => {
    setUrl(entry.url)
    if (entry.resultKey) {
      try {
        const saved = localStorage.getItem(entry.resultKey)
        if (saved) { setResult(JSON.parse(saved)); return }
      } catch {}
    }
    // Fallback: load last result
    try {
      const last = localStorage.getItem('banner-check-result')
      if (last) setResult(JSON.parse(last))
    } catch {}
  }

  const structuredChecks = result?.structured_checks || []
  const hasStructured = structuredChecks.length > 0
  const compPct = result?.completeness_pct ?? 0
  const corrPct = result?.correctness_pct ?? 0

  const checklistResults = hasStructured ? [{
    label: `Cookie-Banner: ${result?.banner_provider || 'Unbekannt'}`,
    url: url,
    doc_type: 'banner',
    word_count: 0,
    completeness_pct: compPct,
    correctness_pct: corrPct,
    checks: structuredChecks,
    findings_count: structuredChecks.filter(c => !c.passed && !c.skipped).length,
    error: '',
  }] : []

  return (
    <div className="space-y-4">
      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
        <h3 className="text-sm font-semibold text-blue-900">Cookie-Banner Compliance Check</h3>
        <p className="text-xs text-blue-700 mt-1">
          Playwright-basierter 3-Phasen-Test: Vor Interaktion, nach Ablehnen, nach Akzeptieren.
          Prueft Dark Patterns, Pre-Consent-Cookies, Farbkontrast, Klick-Paritaet und 36 weitere Kriterien.
        </p>
      </div>

      <div className="flex items-center gap-3">
        <button type="button" onClick={() => setUseAgent(!useAgent)}
          className={`flex items-center gap-2 px-3 py-1.5 rounded-full text-xs font-medium border transition-colors ${
            useAgent ? 'bg-emerald-100 border-emerald-300 text-emerald-800' : 'bg-gray-50 border-gray-200 text-gray-500 hover:bg-gray-100'
          }`}>
          <span className={`w-2 h-2 rounded-full ${useAgent ? 'bg-emerald-500' : 'bg-gray-300'}`} />
          {useAgent ? 'KI-Agent aktiv (381 Cookie-MCs)' : 'KI-Agent aus'}
        </button>
      </div>

      <form onSubmit={handleScan} className="space-y-3">
        <div className="flex gap-3">
          <input
            type="url" value={url} onChange={e => setUrl(e.target.value)}
            placeholder="https://www.example.com/"
            className="flex-1 px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent text-sm"
            disabled={loading} required
          />
          <button type="submit" disabled={loading || !url.trim()}
            className="px-6 py-3 bg-purple-600 text-white rounded-lg hover:bg-purple-700 disabled:opacity-50 transition-colors flex items-center gap-2 text-sm font-medium whitespace-nowrap">
            {loading ? (
              <><svg className="animate-spin w-4 h-4" fill="none" viewBox="0 0 24 24">
                <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
                <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
              </svg>Pruefe...</>
            ) : 'Banner pruefen'}
          </button>
        </div>

        <div className="flex flex-wrap gap-2">
          {CATEGORIES.map(cat => (
            <label key={cat.id}
              className={`inline-flex items-center gap-1.5 px-3 py-1.5 rounded-full text-xs font-medium cursor-pointer border transition-colors ${
                categories.includes(cat.id)
                  ? 'bg-purple-100 border-purple-300 text-purple-800'
                  : 'bg-gray-50 border-gray-200 text-gray-600 hover:bg-gray-100'
              }`}
            >
              <input type="checkbox" checked={categories.includes(cat.id)}
                onChange={() => toggleCategory(cat.id)} className="sr-only" />
              <span className={`w-3 h-3 rounded-sm border flex items-center justify-center ${
                categories.includes(cat.id) ? 'bg-purple-600 border-purple-600' : 'border-gray-400'
              }`}>
                {categories.includes(cat.id) && (
                  <svg className="w-2 h-2 text-white" fill="currentColor" viewBox="0 0 12 12">
                    <path d="M10 3L4.5 8.5 2 6" stroke="currentColor" strokeWidth="2" fill="none" strokeLinecap="round" strokeLinejoin="round" />
                  </svg>
                )}
              </span>
              {cat.label}
            </label>
          ))}
        </div>
      </form>

      {progress && (
        <div className="bg-purple-50 border border-purple-200 rounded-lg p-4 text-sm text-purple-700 flex items-center gap-3">
          <svg className="animate-spin w-5 h-5 text-purple-500 shrink-0" fill="none" viewBox="0 0 24 24">
            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
            <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
          </svg>
          {progress}
        </div>
      )}

      {error && (
        <div className="bg-red-50 border border-red-200 rounded-lg p-4 text-sm text-red-700">{error}</div>
      )}

      {result && (
        <div className="space-y-4">
          {result.phases && (
            <div className="bg-white border border-gray-200 rounded-xl shadow-sm overflow-hidden">
              <div className="px-6 py-4 bg-gray-50 border-b border-gray-200">
                <div className="flex items-center gap-3">
                  <span className="text-2xl">{result.banner_detected ? '🛡️' : '⚠️'}</span>
                  <div>
                    <h3 className="text-sm font-semibold text-gray-900">
                      {result.banner_detected
                        ? `Banner erkannt: ${result.banner_provider || 'Unbekannter Anbieter'}`
                        : 'Kein Cookie-Banner erkannt'}
                    </h3>
                    <p className="text-xs text-gray-500 mt-0.5">3-Phasen-Analyse: Cookies und Scripts vor/nach Interaktion</p>
                  </div>
                </div>
              </div>
              <div className="px-6 py-3 grid grid-cols-3 gap-4">
                <PhaseBox label="Vor Consent" icon="🔒"
                  cookies={result.phases.before_consent.cookies?.length ?? 0}
                  scripts={result.phases.before_consent.scripts?.length ?? 0}
                  violations={result.phases.before_consent.violations?.length ?? 0} />
                <PhaseBox label="Nach Ablehnen" icon="🚫"
                  cookies={result.phases.after_reject.cookies?.length ?? 0}
                  scripts={result.phases.after_reject.scripts?.length ?? 0}
                  violations={result.phases.after_reject.violations?.length ?? 0} />
                <PhaseBox label="Nach Akzeptieren" icon="&#x2705;"
                  cookies={result.phases.after_accept.cookies?.length ?? 0}
                  scripts={result.phases.after_accept.scripts?.length ?? 0}
                  violations={0} />
              </div>
            </div>
          )}

          {hasStructured && (
            <div className="bg-white border border-gray-200 rounded-xl p-6 shadow-sm">
              <ChecklistView results={checklistResults} />
            </div>
          )}

          {result.email_status && (
            <div className="text-xs text-gray-500 flex items-center gap-2">
              <span className={`w-2 h-2 rounded-full ${result.email_status === 'sent' ? 'bg-green-400' : 'bg-gray-300'}`} />
              E-Mail: {result.email_status === 'sent' ? 'Gesendet' : result.email_status}
            </div>
          )}

          {/* MC Agent Results (Cookie-Richtlinie) */}
          {mcResults?.results && (
            <div className="bg-white border border-gray-200 rounded-xl p-6 shadow-sm">
              <h4 className="text-sm font-semibold text-gray-800 mb-3">KI-Agent: Cookie-Richtlinie (381 MCs)</h4>
              <ChecklistView results={mcResults.results} />
            </div>
          )}

          {!result.banner_detected && !hasStructured && (
            <div className="bg-white border border-gray-200 rounded-xl p-6 shadow-sm">
              <p className="text-sm text-gray-500">
                Kein Cookie-Banner auf dieser Seite gefunden. Falls Cookies gesetzt werden, ist ein Banner nach §25 TDDDG Pflicht.
              </p>
            </div>
          )}
        </div>
      )}

      {/* History */}
      {history.length > 0 && (
        <div className="border border-gray-200 rounded-xl p-4">
          <h4 className="text-sm font-medium text-gray-700 mb-2">Letzte Banner-Checks</h4>
          <div className="space-y-1">
            {history.map((h, i) => (
              <button key={i} onClick={() => loadFromHistory(h)}
                className="w-full flex items-center justify-between p-2.5 rounded-lg border border-gray-100 hover:border-purple-200 hover:bg-purple-50/30 transition-all text-left">
                <div className="min-w-0 flex-1">
                  <div className="text-sm font-medium text-gray-900 truncate">{h.url}</div>
                  <div className="text-xs text-gray-500">
                    {new Date(h.date).toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric', hour: '2-digit', minute: '2-digit' })}
                    {' · '}{h.provider}
                  </div>
                </div>
                <div className="flex items-center gap-3 shrink-0 ml-3">
                  <span className={`text-xs font-medium ${h.violations > 0 ? 'text-red-600' : 'text-green-600'}`}>
                    {h.violations} Findings
                  </span>
                  <span className={`text-xs font-medium ${h.pct === 100 ? 'text-green-700' : h.pct >= 50 ? 'text-yellow-700' : 'text-red-700'}`}>
                    {h.pct}%
                  </span>
                </div>
              </button>
            ))}
          </div>
        </div>
      )}
    </div>
  )
}

function PhaseBox({ label, icon, cookies, scripts, violations }: {
  label: string; icon: string; cookies: number; scripts: number; violations: number
}) {
  return (
    <div className="text-center">
      <div className="text-lg">{icon}</div>
      <div className="text-xs font-medium text-gray-700">{label}</div>
      <div className="text-xs text-gray-500 mt-1">{cookies} Cookies, {scripts} Scripts</div>
      {violations > 0 && <div className="text-xs text-red-600 font-medium">{violations} Verstoesse</div>}
    </div>
  )
}