'use client'

import {
  Shield, Search, ChevronRight, ChevronLeft, Filter, Lock,
  BookOpen, Plus, Zap, BarChart3, ListChecks, Trash2,
  ChevronsLeft, ChevronsRight, ArrowUpDown, Clock, RefreshCw,
} from 'lucide-react'
import {
  CanonicalControl, Framework,
  SeverityBadge, StateBadge, LicenseRuleBadge, VerificationMethodBadge, CategoryBadge, EvidenceTypeBadge, TargetAudienceBadge,
  GenerationStrategyBadge, ObligationTypeBadge,
  VERIFICATION_METHODS, CATEGORY_OPTIONS, EVIDENCE_TYPE_OPTIONS,
} from './helpers'
import { ControlsMeta } from './useControlLibraryState'
import { GeneratorModal } from './GeneratorModal'

interface ControlListViewProps {
  frameworks: Framework[]
  controls: CanonicalControl[]
  totalCount: number
  meta: ControlsMeta | null
  loading: boolean
  reviewCount: number
  bulkProcessing: boolean
  showStats: boolean
  processedStats: Array<Record<string, unknown>>
  showGenerator: boolean
  currentPage: number
  totalPages: number
  sortBy: 'id' | 'newest' | 'oldest' | 'source'
  // Filter values
  searchQuery: string
  severityFilter: string
  domainFilter: string
  stateFilter: string
  verificationFilter: string
  categoryFilter: string
  evidenceTypeFilter: string
  audienceFilter: string
  sourceFilter: string
  typeFilter: string
  hideDuplicates: boolean
  // Setters
  setSearchQuery: (v: string) => void
  setSeverityFilter: (v: string) => void
  setDomainFilter: (v: string) => void
  setStateFilter: (v: string) => void
  setVerificationFilter: (v: string) => void
  setCategoryFilter: (v: string) => void
  setEvidenceTypeFilter: (v: string) => void
  setAudienceFilter: (v: string) => void
  setSourceFilter: (v: string) => void
  setTypeFilter: (v: string) => void
  setHideDuplicates: (v: boolean) => void
  setSortBy: (v: 'id' | 'newest' | 'oldest' | 'source') => void
  setShowStats: (v: boolean) => void
  setShowGenerator: (v: boolean) => void
  setCurrentPage: (v: number | ((p: number) => number)) => void
  // Actions
  onSelectControl: (c: CanonicalControl) => void
  onCreateMode: () => void
  onEnterReview: () => void
  onBulkReject: (state: string) => void
  onRefresh: () => void
  onLoadStats: () => void
  onFullReload: () => void
}

export function ControlListView({
  frameworks, controls, totalCount, meta, loading,
  reviewCount, bulkProcessing, showStats, processedStats,
  showGenerator, currentPage, totalPages, sortBy,
  searchQuery, severityFilter, domainFilter, stateFilter,
  verificationFilter, categoryFilter, evidenceTypeFilter, audienceFilter,
  sourceFilter, typeFilter, hideDuplicates,
  setSearchQuery, setSeverityFilter, setDomainFilter, setStateFilter,
  setVerificationFilter, setCategoryFilter, setEvidenceTypeFilter, setAudienceFilter,
  setSourceFilter, setTypeFilter, setHideDuplicates, setSortBy,
  setShowStats, setShowGenerator, setCurrentPage,
  onSelectControl, onCreateMode, onEnterReview, onBulkReject, onRefresh, onLoadStats, onFullReload,
}: ControlListViewProps) {
  const debouncedSearch = searchQuery // used for empty state message

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="border-b border-gray-200 bg-white px-6 py-4">
        <div className="flex items-center justify-between mb-4">
          <div className="flex items-center gap-3">
            <Shield className="w-6 h-6 text-purple-600" />
            <div>
              <h1 className="text-lg font-semibold text-gray-900">Canonical Control Library</h1>
              <p className="text-xs text-gray-500">{meta?.total ?? totalCount} Security Controls</p>
            </div>
          </div>
          <div className="flex items-center gap-2">
            {reviewCount > 0 && (
              <>
                <button onClick={onEnterReview} className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-yellow-600 rounded-lg hover:bg-yellow-700">
                  <ListChecks className="w-4 h-4" />
                  Review ({reviewCount})
                </button>
                <button onClick={() => onBulkReject('needs_review')} disabled={bulkProcessing}
                  className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-red-600 rounded-lg hover:bg-red-700 disabled:opacity-50">
                  <Trash2 className="w-4 h-4" />
                  {bulkProcessing ? 'Wird verarbeitet...' : `Alle ${reviewCount} ablehnen`}
                </button>
              </>
            )}
            <button onClick={() => { setShowStats(!showStats); if (!showStats) onLoadStats() }}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-gray-600 border border-gray-300 rounded-lg hover:bg-gray-50">
              <BarChart3 className="w-4 h-4" />Stats
            </button>
            <button onClick={() => setShowGenerator(true)}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-amber-600 rounded-lg hover:bg-amber-700">
              <Zap className="w-4 h-4" />Generator
            </button>
            <button onClick={onCreateMode}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-purple-600 rounded-lg hover:bg-purple-700">
              <Plus className="w-4 h-4" />Neues Control
            </button>
          </div>
        </div>

        {frameworks.length > 0 && (
          <div className="mb-4 p-3 bg-purple-50 rounded-lg">
            <div className="flex items-center gap-2 text-xs text-purple-700">
              <Lock className="w-3 h-3" />
              <span className="font-medium">{frameworks[0]?.name} v{frameworks[0]?.version}</span>
              <span className="text-purple-500">—</span>
              <span>{frameworks[0]?.description}</span>
            </div>
          </div>
        )}

        {/* Filters */}
        <div className="space-y-3">
          <div className="flex items-center gap-3">
            <div className="relative flex-1">
              <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400" />
              <input type="text" placeholder="Controls durchsuchen (ID, Titel, Objective)..."
                value={searchQuery} onChange={e => setSearchQuery(e.target.value)}
                className="w-full pl-9 pr-4 py-2 text-sm border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-purple-500" />
            </div>
            <button onClick={onRefresh} className="p-2 text-gray-400 hover:text-purple-600" title="Aktualisieren">
              <RefreshCw className={`w-4 h-4 ${loading ? 'animate-spin' : ''}`} />
            </button>
          </div>
          <div className="flex items-center gap-2 flex-wrap">
            <Filter className="w-4 h-4 text-gray-400" />
            <select value={severityFilter} onChange={e => setSeverityFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Schweregrad</option>
              <option value="critical">Kritisch{meta?.severity_counts?.critical ? ` (${meta.severity_counts.critical})` : ''}</option>
              <option value="high">Hoch{meta?.severity_counts?.high ? ` (${meta.severity_counts.high})` : ''}</option>
              <option value="medium">Mittel{meta?.severity_counts?.medium ? ` (${meta.severity_counts.medium})` : ''}</option>
              <option value="low">Niedrig{meta?.severity_counts?.low ? ` (${meta.severity_counts.low})` : ''}</option>
            </select>
            <select value={domainFilter} onChange={e => setDomainFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Domain</option>
              {(meta?.domains || []).map(d => <option key={d.domain} value={d.domain}>{d.domain} ({d.count})</option>)}
            </select>
            <select value={stateFilter} onChange={e => setStateFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Status</option>
              <option value="draft">Draft{meta?.release_state_counts?.draft ? ` (${meta.release_state_counts.draft})` : ''}</option>
              <option value="approved">Approved{meta?.release_state_counts?.approved ? ` (${meta.release_state_counts.approved})` : ''}</option>
              <option value="needs_review">Review noetig{meta?.release_state_counts?.needs_review ? ` (${meta.release_state_counts.needs_review})` : ''}</option>
              <option value="too_close">Zu aehnlich{meta?.release_state_counts?.too_close ? ` (${meta.release_state_counts.too_close})` : ''}</option>
              <option value="duplicate">Duplikat{meta?.release_state_counts?.duplicate ? ` (${meta.release_state_counts.duplicate})` : ''}</option>
              <option value="deprecated">Deprecated{meta?.release_state_counts?.deprecated ? ` (${meta.release_state_counts.deprecated})` : ''}</option>
            </select>
            <label className="flex items-center gap-1.5 text-sm text-gray-600 cursor-pointer whitespace-nowrap">
              <input type="checkbox" checked={hideDuplicates} onChange={e => setHideDuplicates(e.target.checked)}
                className="rounded border-gray-300 text-purple-600 focus:ring-purple-500" />
              Duplikate ausblenden
            </label>
            <select value={verificationFilter} onChange={e => setVerificationFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Nachweis</option>
              {Object.entries(VERIFICATION_METHODS).map(([k, v]) => (
                <option key={k} value={k}>{v.label}{meta?.verification_method_counts?.[k] ? ` (${meta.verification_method_counts[k]})` : ''}</option>
              ))}
              {meta?.verification_method_counts?.['__none__'] ? <option value="__none__">Ohne Nachweis ({meta.verification_method_counts['__none__']})</option> : null}
            </select>
            <select value={categoryFilter} onChange={e => setCategoryFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Kategorie</option>
              {CATEGORY_OPTIONS.map(c => <option key={c.value} value={c.value}>{c.label}{meta?.category_counts?.[c.value] ? ` (${meta.category_counts[c.value]})` : ''}</option>)}
              {meta?.category_counts?.['__none__'] ? <option value="__none__">Ohne Kategorie ({meta.category_counts['__none__']})</option> : null}
            </select>
            <select value={evidenceTypeFilter} onChange={e => setEvidenceTypeFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Nachweisart</option>
              {EVIDENCE_TYPE_OPTIONS.map(c => <option key={c.value} value={c.value}>{c.label}{meta?.evidence_type_counts?.[c.value] ? ` (${meta.evidence_type_counts[c.value]})` : ''}</option>)}
              {meta?.evidence_type_counts?.['__none__'] ? <option value="__none__">Ohne Nachweisart ({meta.evidence_type_counts['__none__']})</option> : null}
            </select>
            <select value={audienceFilter} onChange={e => setAudienceFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Zielgruppe</option>
              <option value="unternehmen">Unternehmen</option>
              <option value="behoerden">Behoerden</option>
              <option value="entwickler">Entwickler</option>
              <option value="datenschutzbeauftragte">DSB</option>
              <option value="geschaeftsfuehrung">Geschaeftsfuehrung</option>
              <option value="it-abteilung">IT-Abteilung</option>
              <option value="rechtsabteilung">Rechtsabteilung</option>
              <option value="compliance-officer">Compliance Officer</option>
              <option value="personalwesen">Personalwesen</option>
              <option value="einkauf">Einkauf</option>
              <option value="produktion">Produktion</option>
              <option value="vertrieb">Vertrieb</option>
              <option value="gesundheitswesen">Gesundheitswesen</option>
              <option value="finanzwesen">Finanzwesen</option>
              <option value="oeffentlicher_dienst">Oeffentl. Dienst</option>
            </select>
            <select value={sourceFilter} onChange={e => setSourceFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500 max-w-[220px]">
              <option value="">Dokumentenursprung</option>
              {meta && <option value="__none__">Ohne Quelle ({meta.no_source_count})</option>}
              {(meta?.sources || []).map(s => <option key={s.source} value={s.source}>{s.source} ({s.count})</option>)}
            </select>
            <select value={typeFilter} onChange={e => setTypeFilter(e.target.value)}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="">Alle Typen</option>
              <option value="rich">Rich Controls{meta?.type_counts ? ` (${meta.type_counts.rich})` : ''}</option>
              <option value="atomic">Atomare Controls{meta?.type_counts ? ` (${meta.type_counts.atomic})` : ''}</option>
              <option value="eigenentwicklung">Eigenentwicklung{meta?.type_counts ? ` (${meta.type_counts.eigenentwicklung})` : ''}</option>
            </select>
            <span className="text-gray-300 mx-1">|</span>
            <ArrowUpDown className="w-4 h-4 text-gray-400" />
            <select value={sortBy} onChange={e => setSortBy(e.target.value as 'id' | 'newest' | 'oldest' | 'source')}
              className="text-sm border border-gray-300 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-purple-500">
              <option value="id">Sortierung: ID</option>
              <option value="source">Nach Quelle</option>
              <option value="newest">Neueste zuerst</option>
              <option value="oldest">Aelteste zuerst</option>
            </select>
          </div>
        </div>

        {showStats && processedStats.length > 0 && (
          <div className="mt-3 p-3 bg-gray-50 rounded-lg">
            <h4 className="text-xs font-semibold text-gray-700 mb-2">Verarbeitungsfortschritt</h4>
            <div className="grid grid-cols-3 gap-3">
              {processedStats.map((s, i) => (
                <div key={i} className="text-xs">
                  <span className="font-medium text-gray-700">{String(s.collection)}</span>
                  <div className="flex gap-2 mt-1 text-gray-500">
                    <span>{String(s.processed_chunks)} verarbeitet</span>
                    <span>{String(s.direct_adopted)} direkt</span>
                    <span>{String(s.llm_reformed)} reformuliert</span>
                  </div>
                </div>
              ))}
            </div>
          </div>
        )}
      </div>

      {showGenerator && <GeneratorModal onClose={() => setShowGenerator(false)} onComplete={onFullReload} />}

      {/* Pagination Header */}
      <div className="px-6 py-2 bg-gray-50 border-b border-gray-200 flex items-center justify-between text-xs text-gray-500">
        <div className="flex items-center gap-3">
          <span>
            {totalCount} Controls gefunden
            {totalCount !== (meta?.total ?? totalCount) && ` (von ${meta?.total} gesamt)`}
            {loading && <span className="ml-2 text-purple-500">Lade...</span>}
          </span>
          {stateFilter && ['needs_review', 'too_close', 'duplicate'].includes(stateFilter) && totalCount > 0 && (
            <button onClick={() => onBulkReject(stateFilter)} disabled={bulkProcessing}
              className="flex items-center gap-1 px-2 py-1 text-xs text-white bg-red-600 rounded hover:bg-red-700 disabled:opacity-50">
              <Trash2 className="w-3 h-3" />
              {bulkProcessing ? '...' : `Alle ${totalCount} ablehnen`}
            </button>
          )}
        </div>
        <span>Seite {currentPage} von {totalPages}</span>
      </div>

      {/* Control List */}
      <div className="flex-1 overflow-y-auto p-6">
        <div className="space-y-3">
          {controls.map((ctrl, idx) => {
            const prevSource = idx > 0 ? (controls[idx - 1].source_citation?.source || 'Ohne Quelle') : null
            const curSource = ctrl.source_citation?.source || 'Ohne Quelle'
            const showSourceHeader = sortBy === 'source' && curSource !== prevSource
            return (
              <div key={ctrl.control_id}>
                {showSourceHeader && (
                  <div className="flex items-center gap-2 pt-3 pb-1">
                    <div className="h-px flex-1 bg-blue-200" />
                    <span className="text-xs font-semibold text-blue-700 bg-blue-50 px-2 py-0.5 rounded whitespace-nowrap">{curSource}</span>
                    <div className="h-px flex-1 bg-blue-200" />
                  </div>
                )}
                <button onClick={() => onSelectControl(ctrl)}
                  className="w-full text-left bg-white border border-gray-200 rounded-lg p-4 hover:border-purple-300 hover:shadow-sm transition-all group">
                  <div className="flex items-start justify-between">
                    <div className="flex-1 min-w-0">
                      <div className="flex items-center gap-2 mb-1 flex-wrap">
                        <span className="text-xs font-mono text-purple-600 bg-purple-50 px-1.5 py-0.5 rounded">{ctrl.control_id}</span>
                        <SeverityBadge severity={ctrl.severity} />
                        <StateBadge state={ctrl.release_state} />
                        <LicenseRuleBadge rule={ctrl.license_rule} />
                        <VerificationMethodBadge method={ctrl.verification_method} />
                        <CategoryBadge category={ctrl.category} />
                        <EvidenceTypeBadge type={ctrl.evidence_type} />
                        <TargetAudienceBadge audience={ctrl.target_audience} />
                        <GenerationStrategyBadge strategy={ctrl.generation_strategy} pipelineInfo={ctrl} />
                        <ObligationTypeBadge type={ctrl.generation_metadata?.obligation_type as string} />
                        {ctrl.risk_score !== null && <span className="text-xs text-gray-400">Score: {ctrl.risk_score}</span>}
                      </div>
                      <h3 className="text-sm font-medium text-gray-900 group-hover:text-purple-700">{ctrl.title}</h3>
                      <p className="text-xs text-gray-500 mt-1 line-clamp-2">{ctrl.objective}</p>
                      <div className="flex items-center gap-2 mt-2">
                        <BookOpen className="w-3 h-3 text-green-600" />
                        <span className="text-xs text-green-700">{ctrl.open_anchors.length} Referenzen</span>
                        {ctrl.source_citation?.source && (
                          <>
                            <span className="text-gray-300">|</span>
                            <span className="text-xs text-blue-600">
                              {ctrl.source_citation.source}
                              {ctrl.source_citation.article && ` ${ctrl.source_citation.article}`}
                              {ctrl.source_citation.paragraph && ` ${ctrl.source_citation.paragraph}`}
                            </span>
                          </>
                        )}
                        <span className="text-gray-300">|</span>
                        <Clock className="w-3 h-3 text-gray-400" />
                        <span className="text-xs text-gray-400" title={ctrl.created_at}>
                          {ctrl.created_at ? new Date(ctrl.created_at).toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: '2-digit', hour: '2-digit', minute: '2-digit' }) : '–'}
                        </span>
                      </div>
                    </div>
                    <ChevronRight className="w-4 h-4 text-gray-300 group-hover:text-purple-500 flex-shrink-0 mt-1 ml-4" />
                  </div>
                </button>
              </div>
            )
          })}
          {controls.length === 0 && !loading && (
            <div className="text-center py-12 text-gray-400 text-sm">
              {totalCount === 0 && !debouncedSearch && !severityFilter && !domainFilter
                ? 'Noch keine Controls vorhanden. Klicke auf "Neues Control" um zu starten.'
                : 'Keine Controls gefunden.'}
            </div>
          )}
        </div>

        {/* Pagination Controls */}
        {totalPages > 1 && (
          <div className="flex items-center justify-center gap-2 mt-6 pb-4">
            <button onClick={() => setCurrentPage(1)} disabled={currentPage === 1}
              className="p-2 text-gray-500 hover:text-purple-600 disabled:opacity-30 disabled:cursor-not-allowed" title="Erste Seite">
              <ChevronsLeft className="w-4 h-4" />
            </button>
            <button onClick={() => setCurrentPage(p => Math.max(1, p - 1))} disabled={currentPage === 1}
              className="p-2 text-gray-500 hover:text-purple-600 disabled:opacity-30 disabled:cursor-not-allowed" title="Vorherige Seite">
              <ChevronLeft className="w-4 h-4" />
            </button>
            {Array.from({ length: totalPages }, (_, i) => i + 1)
              .filter(p => p === 1 || p === totalPages || Math.abs(p - currentPage) <= 2)
              .reduce<(number | 'dots')[]>((acc, p, i, arr) => {
                if (i > 0 && p - (arr[i - 1] as number) > 1) acc.push('dots')
                acc.push(p)
                return acc
              }, [])
              .map((p, i) =>
                p === 'dots' ? (
                  <span key={`dots-${i}`} className="px-1 text-gray-400">...</span>
                ) : (
                  <button key={p} onClick={() => setCurrentPage(p as number)}
                    className={`w-8 h-8 text-sm rounded-lg ${currentPage === p ? 'bg-purple-600 text-white' : 'text-gray-600 hover:bg-purple-50 hover:text-purple-600'}`}>
                    {p}
                  </button>
                )
              )}
            <button onClick={() => setCurrentPage(p => Math.min(totalPages, p + 1))} disabled={currentPage === totalPages}
              className="p-2 text-gray-500 hover:text-purple-600 disabled:opacity-30 disabled:cursor-not-allowed" title="Naechste Seite">
              <ChevronRight className="w-4 h-4" />
            </button>
            <button onClick={() => setCurrentPage(totalPages)} disabled={currentPage === totalPages}
              className="p-2 text-gray-500 hover:text-purple-600 disabled:opacity-30 disabled:cursor-not-allowed" title="Letzte Seite">
              <ChevronsRight className="w-4 h-4" />
            </button>
          </div>
        )}
      </div>
    </div>
  )
}
