'use client'

import { useMemo } from 'react'
import { TOMGeneratorState, GapAnalysisResult, DerivedTOM } from '@/lib/sdk/tom-generator/types'
import { getControlById, getAllControls } from '@/lib/sdk/tom-generator/controls/loader'
import {
  SDM_GOAL_LABELS,
  SDM_GOAL_DESCRIPTIONS,
  getSDMCoverageStats,
  MODULE_LABELS,
  getModuleCoverageStats,
  SDMGewaehrleistungsziel,
  TOMModuleCategory,
} from '@/lib/sdk/tom-generator/sdm-mapping'

interface TOMGapExportTabProps {
  state: TOMGeneratorState
  onRunGapAnalysis: () => void
}

function getScoreColor(score: number): string {
  if (score >= 75) return 'text-green-600'
  if (score >= 50) return 'text-yellow-600'
  return 'text-red-600'
}

function getScoreBgColor(score: number): string {
  if (score >= 75) return 'bg-green-50 border-green-200'
  if (score >= 50) return 'bg-yellow-50 border-yellow-200'
  return 'bg-red-50 border-red-200'
}

function getBarColor(score: number): string {
  if (score >= 75) return 'bg-green-500'
  if (score >= 50) return 'bg-yellow-500'
  return 'bg-red-500'
}

function downloadJSON(data: unknown, filename: string) {
  const json = JSON.stringify(data, null, 2)
  const blob = new Blob([json], { type: 'application/json' })
  const url = URL.createObjectURL(blob)
  const a = document.createElement('a')
  a.href = url
  a.download = filename
  document.body.appendChild(a)
  a.click()
  document.body.removeChild(a)
  URL.revokeObjectURL(url)
}

export function TOMGapExportTab({ state, onRunGapAnalysis }: TOMGapExportTabProps) {
  const gap = state.gapAnalysis as GapAnalysisResult | null | undefined

  const sdmGoals = useMemo(() => {
    const goals = Object.keys(SDM_GOAL_LABELS) as SDMGewaehrleistungsziel[]
    const allStats = getSDMCoverageStats(state.derivedTOMs)
    return goals.map(key => {
      const stats = allStats[key] || { total: 0, implemented: 0, partial: 0, missing: 0 }
      const total = stats.total || 1
      const percent = Math.round((stats.implemented / total) * 100)
      return {
        key,
        label: SDM_GOAL_LABELS[key],
        description: SDM_GOAL_DESCRIPTIONS[key],
        stats,
        percent,
      }
    })
  }, [state.derivedTOMs])

  const modules = useMemo(() => {
    const moduleKeys = Object.keys(MODULE_LABELS) as TOMModuleCategory[]
    const allStats = getModuleCoverageStats(state.derivedTOMs)
    return moduleKeys.map(key => {
      const stats = allStats[key] || { total: 0, implemented: 0 }
      const total = stats.total || 1
      const percent = Math.round((stats.implemented / total) * 100)
      return {
        key,
        label: MODULE_LABELS[key],
        stats: { ...stats, partial: 0, missing: total - stats.implemented },
        percent,
      }
    })
  }, [state.derivedTOMs])

  const handleExportTOMs = () => {
    downloadJSON(state.derivedTOMs, `tom-export-${new Date().toISOString().slice(0, 10)}.json`)
  }

  const handleExportGap = () => {
    if (!gap) return
    downloadJSON(gap, `gap-analyse-${new Date().toISOString().slice(0, 10)}.json`)
  }

  return (
    <div className="space-y-6">
      {/* Gap Analysis */}
      <div className="bg-white rounded-xl border border-gray-200 p-6">
        <div className="flex items-center justify-between mb-6">
          <h3 className="text-lg font-semibold text-gray-900">Gap-Analyse</h3>
          <button
            onClick={onRunGapAnalysis}
            className="bg-purple-600 text-white hover:bg-purple-700 rounded-lg px-4 py-2 text-sm font-medium transition-colors"
          >
            Analyse ausfuehren
          </button>
        </div>

        {gap ? (
          <div className="space-y-6">
            {/* Score Gauge */}
            <div className="flex justify-center">
              <div className={`rounded-xl border-2 p-8 text-center ${getScoreBgColor(gap.overallScore)}`}>
                <div className={`text-5xl font-bold ${getScoreColor(gap.overallScore)}`}>
                  {gap.overallScore}
                </div>
                <div className="text-sm text-gray-600 mt-1">von 100 Punkten</div>
              </div>
            </div>

            {/* Missing Controls */}
            {gap.missingControls && gap.missingControls.length > 0 && (
              <div>
                <h4 className="text-sm font-semibold text-red-700 mb-2">
                  Fehlende Kontrollen ({gap.missingControls.length})
                </h4>
                <div className="space-y-1">
                  {gap.missingControls.map((mc, idx) => {
                    const control = getControlById(mc.controlId)
                    return (
                      <div key={idx} className="flex items-center gap-2 bg-red-50 rounded-lg px-3 py-2">
                        <span className="text-xs font-mono text-red-400">{control?.code || mc.controlId}</span>
                        <span className="text-sm text-red-700">{control?.name?.de || mc.controlId}</span>
                        {mc.reason && <span className="text-xs text-red-400 ml-auto">{mc.reason}</span>}
                      </div>
                    )
                  })}
                </div>
              </div>
            )}

            {/* Partial Controls */}
            {gap.partialControls && gap.partialControls.length > 0 && (
              <div>
                <h4 className="text-sm font-semibold text-yellow-700 mb-2">
                  Teilweise implementierte Kontrollen ({gap.partialControls.length})
                </h4>
                <div className="space-y-1">
                  {gap.partialControls.map((pc, idx) => {
                    const control = getControlById(pc.controlId)
                    return (
                      <div key={idx} className="flex items-center gap-2 bg-yellow-50 rounded-lg px-3 py-2">
                        <span className="text-xs font-mono text-yellow-500">{control?.code || pc.controlId}</span>
                        <span className="text-sm text-yellow-700">{control?.name?.de || pc.controlId}</span>
                      </div>
                    )
                  })}
                </div>
              </div>
            )}

            {/* Missing Evidence */}
            {gap.missingEvidence && gap.missingEvidence.length > 0 && (
              <div>
                <h4 className="text-sm font-semibold text-orange-700 mb-2">
                  Fehlende Nachweise ({gap.missingEvidence.length})
                </h4>
                <div className="space-y-1">
                  {gap.missingEvidence.map((item, idx) => {
                    const control = getControlById(item.controlId)
                    return (
                      <div key={idx} className="flex items-center gap-2 bg-orange-50 rounded-lg px-3 py-2">
                        <svg className="w-4 h-4 text-orange-400 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.082 16.5c-.77.833.192 2.5 1.732 2.5z" />
                        </svg>
                        <span className="text-sm text-orange-700">
                          {control?.name?.de || item.controlId}: {item.requiredEvidence.join(', ')}
                        </span>
                      </div>
                    )
                  })}
                </div>
              </div>
            )}

            {/* Recommendations */}
            {gap.recommendations && gap.recommendations.length > 0 && (
              <div>
                <h4 className="text-sm font-semibold text-blue-700 mb-2">
                  Empfehlungen ({gap.recommendations.length})
                </h4>
                <div className="space-y-1">
                  {gap.recommendations.map((rec, idx) => (
                    <div key={idx} className="flex items-start gap-2 bg-blue-50 rounded-lg px-3 py-2">
                      <svg className="w-4 h-4 text-blue-400 mt-0.5 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
                      </svg>
                      <span className="text-sm text-blue-700">
                        {typeof rec === 'string' ? rec : (rec as { text?: string; message?: string }).text || (rec as { text?: string; message?: string }).message || JSON.stringify(rec)}
                      </span>
                    </div>
                  ))}
                </div>
              </div>
            )}
          </div>
        ) : (
          <div className="text-center py-8 text-gray-400">
            <svg className="w-12 h-12 mx-auto mb-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
            </svg>
            <p className="text-sm">Fuehren Sie die Gap-Analyse aus, um Luecken in Ihren TOMs zu identifizieren.</p>
          </div>
        )}
      </div>

      {/* SDM Gewaehrleistungsziele */}
      <div className="bg-white rounded-xl border border-gray-200 p-6">
        <h3 className="text-lg font-semibold text-gray-900 mb-4">SDM Gewaehrleistungsziele</h3>
        <div className="space-y-4">
          {sdmGoals.map(goal => (
            <div key={goal.key}>
              <div className="flex items-center justify-between mb-1">
                <div>
                  <span className="text-sm font-medium text-gray-700">{goal.label}</span>
                  {goal.description && (
                    <span className="text-xs text-gray-400 ml-2">{goal.description}</span>
                  )}
                </div>
                <div className="text-xs text-gray-500">
                  {goal.stats.implemented}/{goal.stats.total} implementiert
                  {goal.stats.partial > 0 && ` | ${goal.stats.partial} teilweise`}
                  {goal.stats.missing > 0 && ` | ${goal.stats.missing} fehlend`}
                </div>
              </div>
              <div className="h-3 bg-gray-100 rounded-full overflow-hidden">
                <div className="h-full flex">
                  <div
                    className="bg-green-500 h-full transition-all"
                    style={{ width: `${goal.percent}%` }}
                  />
                  <div
                    className="bg-yellow-400 h-full transition-all"
                    style={{ width: `${goal.stats.total ? Math.round((goal.stats.partial / goal.stats.total) * 100) : 0}%` }}
                  />
                </div>
              </div>
            </div>
          ))}
        </div>
      </div>

      {/* Module Coverage */}
      <div className="bg-white rounded-xl border border-gray-200 p-6">
        <h3 className="text-lg font-semibold text-gray-900 mb-4">Modul-Abdeckung</h3>
        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
          {modules.map(mod => (
            <div key={mod.key} className="border border-gray-200 rounded-lg p-4">
              <div className="text-sm font-medium text-gray-700 mb-2">{mod.label}</div>
              <div className="flex items-end gap-2 mb-2">
                <span className={`text-2xl font-bold ${getScoreColor(mod.percent)}`}>
                  {mod.percent}%
                </span>
                <span className="text-xs text-gray-400 mb-1">
                  ({mod.stats.implemented}/{mod.stats.total})
                </span>
              </div>
              <div className="h-2 bg-gray-100 rounded-full overflow-hidden">
                <div
                  className={`h-full rounded-full transition-all ${getBarColor(mod.percent)}`}
                  style={{ width: `${mod.percent}%` }}
                />
              </div>
              {mod.stats.partial > 0 && (
                <div className="text-xs text-yellow-600 mt-1">{mod.stats.partial} teilweise</div>
              )}
              {mod.stats.missing > 0 && (
                <div className="text-xs text-red-500 mt-0.5">{mod.stats.missing} fehlend</div>
              )}
            </div>
          ))}
        </div>
      </div>

      {/* Export Section */}
      <div className="bg-white rounded-xl border border-gray-200 p-6">
        <h3 className="text-lg font-semibold text-gray-900 mb-4">Export</h3>
        <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
          <button
            onClick={handleExportTOMs}
            disabled={state.derivedTOMs.length === 0}
            className="flex flex-col items-center gap-2 border border-gray-200 rounded-lg p-4 hover:border-purple-300 hover:bg-purple-50 transition-all disabled:opacity-50 disabled:cursor-not-allowed"
          >
            <svg className="w-8 h-8 text-purple-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
            </svg>
            <span className="text-sm font-medium text-gray-700">JSON Export</span>
            <span className="text-xs text-gray-400">Alle TOMs als JSON</span>
          </button>

          <button
            onClick={handleExportGap}
            disabled={!gap}
            className="flex flex-col items-center gap-2 border border-gray-200 rounded-lg p-4 hover:border-purple-300 hover:bg-purple-50 transition-all disabled:opacity-50 disabled:cursor-not-allowed"
          >
            <svg className="w-8 h-8 text-purple-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
            </svg>
            <span className="text-sm font-medium text-gray-700">Gap-Analyse Export</span>
            <span className="text-xs text-gray-400">Analyseergebnis als JSON</span>
          </button>

          <div className="flex flex-col items-center gap-2 border border-dashed border-gray-300 rounded-lg p-4 bg-gray-50">
            <svg className="w-8 h-8 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M5 8h14M5 8a2 2 0 110-4h14a2 2 0 110 4M5 8v10a2 2 0 002 2h10a2 2 0 002-2V8m-9 4h4" />
            </svg>
            <span className="text-sm font-medium text-gray-500">Vollstaendiger Export (ZIP)</span>
            <span className="text-xs text-gray-400 text-center">
              Nutzen Sie den TOM Generator fuer den vollstaendigen Export mit DOCX/PDF
            </span>
          </div>
        </div>
      </div>
    </div>
  )
}