'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[] }
  }
}

export function BannerCheckTab() {
  const [url, setUrl] = useState('')
  const [loading, setLoading] = useState(false)
  const [progress, setProgress] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [result, setResult] = useState<BannerResult | null>(null)

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

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

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

      if (data.scan_id) {
        let attempts = 0
        while (attempts < 60) {
          await new Promise(r => setTimeout(r, 3000))
          const poll = await fetch(`/api/sdk/v1/agent/banner-check?scan_id=${data.scan_id}`)
          if (!poll.ok) { attempts++; continue }
          const pollData = await poll.json()
          if (pollData.progress) setProgress(pollData.progress)
          if (pollData.status === 'completed' && pollData.result) {
            setResult(pollData.result)
            break
          }
          if (pollData.status === 'failed') throw new Error(pollData.error || 'Scan fehlgeschlagen')
          attempts++
        }
      } else {
        setResult(data)
      }
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unbekannter Fehler')
    } finally {
      setLoading(false)
      setProgress('')
    }
  }

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

  // Build ChecklistView-compatible result for structured checks
  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>

      <form onSubmit={handleScan} 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">
          {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>
      </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">
          {/* 3-Phase Summary Card */}
          {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 ? '\u{1F6E1}\u{FE0F}' : '\u26A0\u{FE0F}'}
                  </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="\uD83D\uDD12"
                  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="\uD83D\uDEAB"
                  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="\u2705"
                  cookies={result.phases.after_accept.cookies?.length ?? 0}
                  scripts={result.phases.after_accept.scripts?.length ?? 0}
                  violations={0}
                />
              </div>
            </div>
          )}

          {/* Structured L1/L2 Checklist */}
          {hasStructured && (
            <div className="bg-white border border-gray-200 rounded-xl p-6 shadow-sm">
              <ChecklistView results={checklistResults} />
            </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 ss25 TDDDG Pflicht.
              </p>
            </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>
  )
}
