'use client'

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

interface DocEntry {
  id: string
  type: string
  label: string
  url: string
}

const DOC_TYPES = [
  { id: 'dse', label: 'DSI (Datenschutzinformation)' },
  { id: 'agb', label: 'AGB / Nutzungsbedingungen' },
  { id: 'impressum', label: 'Impressum' },
  { id: 'cookie', label: 'Cookie-Richtlinie' },
  { id: 'widerruf', label: 'Widerrufsbelehrung' },
  { id: 'other', label: 'Sonstiges' },
]

function newEntry(): DocEntry {
  return { id: crypto.randomUUID().slice(0, 8), type: 'dse', label: '', url: '' }
}

export function DocCheckTab() {
  const [entries, setEntries] = useState<DocEntry[]>([newEntry()])
  const [checkCookieBanner, setCheckCookieBanner] = useState(false)
  const [loading, setLoading] = useState(false)
  const [progress, setProgress] = useState('')
  const [results, setResults] = useState<any>(null)
  const [error, setError] = useState<string | null>(null)

  const updateEntry = (id: string, field: keyof DocEntry, value: string) => {
    setEntries(prev => prev.map(e => e.id === id ? { ...e, [field]: value } : e))
  }

  const removeEntry = (id: string) => {
    setEntries(prev => prev.filter(e => e.id !== id))
  }

  const addEntry = () => {
    setEntries(prev => [...prev, newEntry()])
  }

  // Auto-detect label from URL
  const autoLabel = (entry: DocEntry) => {
    if (entry.label) return
    try {
      const path = new URL(entry.url).pathname
      const last = path.split('/').filter(Boolean).pop() || ''
      const label = last.replace(/-\d+$/, '').replace(/-/g, ' ')
        .replace(/\b\w/g, c => c.toUpperCase())
      if (label.length > 3) {
        updateEntry(entry.id, 'label', label)
      }
    } catch { /* invalid URL */ }
  }

  const handleSubmit = async () => {
    const validEntries = entries.filter(e => e.url.trim())
    if (validEntries.length === 0) return

    setLoading(true)
    setError(null)
    setResults(null)
    setProgress('Pruefung wird gestartet...')

    try {
      const startRes = await fetch('/api/sdk/v1/agent/doc-check', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          entries: validEntries.map(e => ({
            doc_type: e.type,
            label: e.label || e.url.split('/').pop() || 'Dokument',
            url: e.url.trim(),
          })),
          check_cookie_banner: checkCookieBanner,
        }),
      })
      if (!startRes.ok) throw new Error(`Pruefung konnte nicht gestartet werden: ${startRes.status}`)
      const { check_id } = await startRes.json()
      if (!check_id) throw new Error('Keine Check-ID erhalten')

      // Poll for results
      let attempts = 0
      while (attempts < 120) {
        await new Promise(r => setTimeout(r, 3000))
        const pollRes = await fetch(`/api/sdk/v1/agent/doc-check?check_id=${check_id}`)
        if (!pollRes.ok) { attempts++; continue }
        const pollData = await pollRes.json()
        if (pollData.progress) setProgress(pollData.progress)
        if (pollData.status === 'completed' && pollData.result) {
          setResults(pollData.result)
          setProgress('')
          break
        }
        if (pollData.status === 'failed') {
          throw new Error(pollData.error || 'Pruefung fehlgeschlagen')
        }
        attempts++
      }
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unbekannter Fehler')
      setProgress('')
    } finally {
      setLoading(false)
    }
  }

  return (
    <div className="space-y-4">
      {/* URL Entries */}
      <div className="space-y-2">
        {entries.map((entry, i) => (
          <div key={entry.id} className="flex items-center gap-2">
            <select
              value={entry.type}
              onChange={e => updateEntry(entry.id, 'type', e.target.value)}
              className="w-48 px-3 py-2.5 border border-gray-300 rounded-lg text-sm bg-white shrink-0"
            >
              {DOC_TYPES.map(t => (
                <option key={t.id} value={t.id}>{t.label}</option>
              ))}
            </select>
            <input
              type="text"
              value={entry.label}
              onChange={e => updateEntry(entry.id, 'label', e.target.value)}
              placeholder="Bezeichnung (optional)"
              className="w-40 px-3 py-2.5 border border-gray-300 rounded-lg text-sm shrink-0"
            />
            <input
              type="url"
              value={entry.url}
              onChange={e => updateEntry(entry.id, 'url', e.target.value)}
              onBlur={() => autoLabel(entry)}
              placeholder="https://example.com/datenschutz"
              className="flex-1 px-3 py-2.5 border border-gray-300 rounded-lg text-sm"
            />
            {entries.length > 1 && (
              <button onClick={() => removeEntry(entry.id)}
                className="p-2 text-gray-400 hover:text-red-500 shrink-0">
                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            )}
          </div>
        ))}
      </div>

      {/* Add URL + Options */}
      <div className="flex items-center justify-between">
        <button onClick={addEntry}
          className="flex items-center gap-1.5 text-sm text-purple-600 hover:text-purple-700 font-medium">
          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
          </svg>
          URL hinzufuegen
        </button>

        <label className="flex items-center gap-2 text-sm text-gray-600">
          <input
            type="checkbox"
            checked={checkCookieBanner}
            onChange={e => setCheckCookieBanner(e.target.checked)}
            className="rounded border-gray-300 text-purple-600 focus:ring-purple-500"
          />
          Cookie-Banner pruefen
        </label>
      </div>

      {/* Submit */}
      <button
        onClick={handleSubmit}
        disabled={loading || entries.every(e => !e.url.trim())}
        className="w-full px-4 py-3 bg-purple-600 text-white rounded-lg font-medium hover:bg-purple-700 disabled:opacity-50 transition-colors text-sm flex items-center justify-center gap-2"
      >
        {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...
          </>
        ) : (
          `${entries.filter(e => e.url.trim()).length} Dokument${entries.filter(e => e.url.trim()).length !== 1 ? 'e' : ''} pruefen`
        )}
      </button>

      {/* Progress */}
      {progress && (
        <div className="bg-purple-50 border border-purple-200 rounded-lg p-3 text-sm text-purple-700 flex items-center gap-3">
          <svg className="animate-spin w-4 h-4 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 */}
      {error && (
        <div className="bg-red-50 border border-red-200 rounded-lg p-3 text-sm text-red-700">{error}</div>
      )}

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

          {/* Cookie Banner Result */}
          {results.cookie_banner_result && (
            <div className="mt-4 pt-4 border-t border-gray-200">
              <h4 className="text-sm font-semibold text-gray-800 mb-2">Cookie-Banner</h4>
              <div className="text-sm text-gray-600">
                {results.cookie_banner_result.banner_detected
                  ? `Banner erkannt: ${results.cookie_banner_result.banner_provider || 'unbekannt'}`
                  : 'Kein Banner erkannt'}
              </div>
              {results.cookie_banner_result.banner_checks?.violations?.length > 0 && (
                <div className="mt-2 space-y-1">
                  {results.cookie_banner_result.banner_checks.violations.map((v: any, i: number) => (
                    <div key={i} className="text-xs text-red-600 flex items-start gap-1.5">
                      <span className="shrink-0 mt-0.5">!!</span>
                      <span>{v.text}</span>
                    </div>
                  ))}
                </div>
              )}
            </div>
          )}

          {/* Email Status */}
          {results.email_status && (
            <div className="mt-3 text-xs text-gray-500 flex items-center gap-2">
              <span className={`w-2 h-2 rounded-full ${results.email_status === 'sent' ? 'bg-green-400' : 'bg-gray-300'}`} />
              E-Mail: {results.email_status === 'sent' ? 'Gesendet' : results.email_status}
            </div>
          )}
        </div>
      )}
    </div>
  )
}