'use client'

import React from 'react'
import Link from 'next/link'
import { useSDK, SDK_PACKAGES, getStepsForPackage } from '@/lib/sdk'
import { ProjectSelector } from '@/components/sdk/ProjectSelector/ProjectSelector'
import type { SDKPackageId } from '@/lib/sdk/types'

// =============================================================================
// DASHBOARD CARDS
// =============================================================================

function StatCard({
  title,
  value,
  subtitle,
  icon,
  color,
}: {
  title: string
  value: string | number
  subtitle: string
  icon: React.ReactNode
  color: string
}) {
  return (
    <div className="bg-white rounded-xl border border-gray-200 p-6">
      <div className="flex items-start justify-between">
        <div>
          <p className="text-sm text-gray-500">{title}</p>
          <p className="mt-1 text-3xl font-bold text-gray-900">{value}</p>
          <p className="mt-1 text-sm text-gray-500">{subtitle}</p>
        </div>
        <div className={`p-3 rounded-lg ${color}`}>{icon}</div>
      </div>
    </div>
  )
}

function PackageCard({
  pkg,
  completion,
  stepsCount,
  isLocked,
  projectId,
}: {
  pkg: (typeof SDK_PACKAGES)[number]
  completion: number
  stepsCount: number
  isLocked: boolean
  projectId?: string
}) {
  const steps = getStepsForPackage(pkg.id)
  const firstStep = steps[0]
  const baseHref = firstStep?.url || '/sdk'
  const href = projectId ? `${baseHref}?project=${projectId}` : baseHref

  const content = (
    <div
      className={`block bg-white rounded-xl border-2 p-6 transition-all ${
        isLocked
          ? 'border-gray-100 opacity-60 cursor-not-allowed'
          : completion === 100
          ? 'border-green-200 hover:border-green-300 hover:shadow-lg'
          : 'border-gray-200 hover:border-purple-300 hover:shadow-lg'
      }`}
    >
      <div className="flex items-start gap-4">
        <div
          className={`w-14 h-14 rounded-xl flex items-center justify-center text-2xl ${
            isLocked
              ? 'bg-gray-100 text-gray-400'
              : completion === 100
              ? 'bg-green-100 text-green-600'
              : 'bg-purple-100 text-purple-600'
          }`}
        >
          {isLocked ? (
            <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
            </svg>
          ) : completion === 100 ? (
            <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
            </svg>
          ) : (
            pkg.icon
          )}
        </div>
        <div className="flex-1">
          <div className="flex items-center gap-2">
            <span className="text-sm text-gray-500">{pkg.order}.</span>
            <h3 className="text-lg font-semibold text-gray-900">{pkg.name}</h3>
          </div>
          <p className="mt-1 text-sm text-gray-500">{pkg.description}</p>
          <div className="mt-4">
            <div className="flex items-center justify-between text-sm mb-1">
              <span className="text-gray-500">{stepsCount} Schritte</span>
              <span className={`font-medium ${completion === 100 ? 'text-green-600' : 'text-purple-600'}`}>
                {completion}%
              </span>
            </div>
            <div className="h-2 bg-gray-100 rounded-full overflow-hidden">
              <div
                className={`h-full rounded-full transition-all duration-500 ${
                  completion === 100 ? 'bg-green-500' : 'bg-purple-600'
                }`}
                style={{ width: `${completion}%` }}
              />
            </div>
          </div>
          {!isLocked && (
            <p className="mt-3 text-xs text-gray-400">
              Ergebnis: {pkg.result}
            </p>
          )}
        </div>
      </div>
    </div>
  )

  if (isLocked) {
    return content
  }

  return (
    <Link href={href}>
      {content}
    </Link>
  )
}

function QuickActionCard({
  title,
  description,
  icon,
  href,
  color,
  projectId,
}: {
  title: string
  description: string
  icon: React.ReactNode
  href: string
  color: string
  projectId?: string
}) {
  const finalHref = projectId ? `${href}?project=${projectId}` : href
  return (
    <Link
      href={finalHref}
      className="flex items-center gap-4 p-4 bg-white rounded-xl border border-gray-200 hover:border-purple-300 hover:shadow-md transition-all"
    >
      <div className={`p-3 rounded-lg ${color}`}>{icon}</div>
      <div>
        <h4 className="font-medium text-gray-900">{title}</h4>
        <p className="text-sm text-gray-500">{description}</p>
      </div>
      <svg className="w-5 h-5 text-gray-400 ml-auto" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
      </svg>
    </Link>
  )
}

// =============================================================================
// MAIN DASHBOARD
// =============================================================================

export default function SDKDashboard() {
  const { state, packageCompletion, completionPercentage, setCustomerType, projectId } = useSDK()

  // customerType is set during project creation — default to 'new' for legacy projects
  const effectiveCustomerType = state.customerType || 'new'

  // No project selected → show project list
  if (!projectId) {
    return <ProjectSelector />
  }

  // Calculate total steps
  const totalSteps = SDK_PACKAGES.reduce((sum, pkg) => {
    const steps = getStepsForPackage(pkg.id)
    // Filter import step for new customers
    return sum + steps.filter(s => !(s.id === 'import' && effectiveCustomerType === 'new')).length
  }, 0)

  // Calculate stats
  const completedCheckpoints = Object.values(state.checkpoints).filter(cp => cp.passed).length
  const totalRisks = state.risks.length
  const criticalRisks = state.risks.filter(r => r.severity === 'CRITICAL' || r.severity === 'HIGH').length

  const isPackageLocked = (packageId: SDKPackageId): boolean => {
    if (state.preferences?.allowParallelWork) return false
    const pkg = SDK_PACKAGES.find(p => p.id === packageId)
    if (!pkg || pkg.order === 1) return false

    // Check if previous package is complete
    const prevPkg = SDK_PACKAGES.find(p => p.order === pkg.order - 1)
    if (!prevPkg) return false

    return packageCompletion[prevPkg.id] < 100
  }

  return (
    <div className="space-y-8">
      {/* Header */}
      <div className="flex items-start justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">AI Compliance SDK</h1>
          <p className="mt-1 text-gray-500">
            {effectiveCustomerType === 'new'
              ? 'Neukunden-Modus: Erstellen Sie alle Compliance-Dokumente von Grund auf.'
              : 'Bestandskunden-Modus: Erweitern Sie bestehende Dokumente.'}
          </p>
        </div>
        <button
          onClick={() => setCustomerType(effectiveCustomerType === 'new' ? 'existing' : 'new')}
          className="text-sm text-purple-600 hover:text-purple-700 underline"
        >
          {effectiveCustomerType === 'new' ? 'Zu Bestandskunden wechseln' : 'Zu Neukunden wechseln'}
        </button>
      </div>

      {/* Stats Grid */}
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
        <StatCard
          title="Gesamtfortschritt"
          value={`${completionPercentage}%`}
          subtitle={`${state.completedSteps.length} von ${totalSteps} Schritten`}
          icon={
            <svg className="w-6 h-6 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
            </svg>
          }
          color="bg-purple-50"
        />
        <StatCard
          title="Use Cases"
          value={state.useCases.length}
          subtitle={state.useCases.length === 0 ? 'Noch keine erstellt' : 'Erfasst'}
          icon={
            <svg className="w-6 h-6 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2" />
            </svg>
          }
          color="bg-blue-50"
        />
        <StatCard
          title="Checkpoints"
          value={`${completedCheckpoints}/${totalSteps}`}
          subtitle="Validiert"
          icon={
            <svg className="w-6 h-6 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
            </svg>
          }
          color="bg-green-50"
        />
        <StatCard
          title="Risiken"
          value={totalRisks}
          subtitle={criticalRisks > 0 ? `${criticalRisks} kritisch` : 'Keine kritischen'}
          icon={
            <svg className="w-6 h-6 text-orange-600" 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 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
            </svg>
          }
          color="bg-orange-50"
        />
      </div>

      {/* Bestandskunden: Gap Analysis Banner */}
      {effectiveCustomerType === 'existing' && state.importedDocuments.length === 0 && (
        <div className="bg-gradient-to-r from-indigo-50 to-purple-50 border border-indigo-200 rounded-xl p-6">
          <div className="flex items-start gap-4">
            <div className="w-12 h-12 bg-indigo-100 rounded-xl flex items-center justify-center flex-shrink-0">
              <span className="text-2xl">📄</span>
            </div>
            <div className="flex-1">
              <h3 className="text-lg font-semibold text-gray-900">Bestehende Dokumente importieren</h3>
              <p className="mt-1 text-gray-600">
                Laden Sie Ihre vorhandenen Compliance-Dokumente hoch. Unsere KI analysiert sie und zeigt Ihnen, welche Erweiterungen fuer KI-Compliance erforderlich sind.
              </p>
              <Link
                href={projectId ? `/sdk/import?project=${projectId}` : '/sdk/import'}
                className="inline-flex items-center gap-2 mt-4 px-4 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700 transition-colors"
              >
                <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-8l-4-4m0 0L8 8m4-4v12" />
                </svg>
                Dokumente hochladen
              </Link>
            </div>
          </div>
        </div>
      )}

      {/* Gap Analysis Results */}
      {state.gapAnalysis && (
        <div className="bg-white border border-gray-200 rounded-xl p-6">
          <div className="flex items-center gap-3 mb-4">
            <div className="w-10 h-10 bg-orange-100 rounded-lg flex items-center justify-center">
              <span className="text-xl">📊</span>
            </div>
            <div>
              <h3 className="font-semibold text-gray-900">Gap-Analyse Ergebnis</h3>
              <p className="text-sm text-gray-500">
                {state.gapAnalysis.totalGaps} Luecken gefunden
              </p>
            </div>
          </div>
          <div className="grid grid-cols-4 gap-4">
            <div className="text-center p-3 bg-red-50 rounded-lg">
              <div className="text-2xl font-bold text-red-600">{state.gapAnalysis.criticalGaps}</div>
              <div className="text-xs text-red-600">Kritisch</div>
            </div>
            <div className="text-center p-3 bg-orange-50 rounded-lg">
              <div className="text-2xl font-bold text-orange-600">{state.gapAnalysis.highGaps}</div>
              <div className="text-xs text-orange-600">Hoch</div>
            </div>
            <div className="text-center p-3 bg-yellow-50 rounded-lg">
              <div className="text-2xl font-bold text-yellow-600">{state.gapAnalysis.mediumGaps}</div>
              <div className="text-xs text-yellow-600">Mittel</div>
            </div>
            <div className="text-center p-3 bg-green-50 rounded-lg">
              <div className="text-2xl font-bold text-green-600">{state.gapAnalysis.lowGaps}</div>
              <div className="text-xs text-green-600">Niedrig</div>
            </div>
          </div>
        </div>
      )}

      {/* 5 Packages */}
      <div>
        <h2 className="text-lg font-semibold text-gray-900 mb-4">Compliance-Pakete</h2>
        <div className="grid grid-cols-1 lg:grid-cols-2 xl:grid-cols-3 gap-6">
          {SDK_PACKAGES.map(pkg => {
            const steps = getStepsForPackage(pkg.id)
            const visibleSteps = steps.filter(s => !(s.id === 'import' && effectiveCustomerType === 'new'))

            return (
              <PackageCard
                key={pkg.id}
                pkg={pkg}
                completion={packageCompletion[pkg.id]}
                stepsCount={visibleSteps.length}
                isLocked={isPackageLocked(pkg.id)}
                projectId={projectId}
              />
            )
          })}
        </div>
      </div>

      {/* Quick Actions */}
      <div>
        <h2 className="text-lg font-semibold text-gray-900 mb-4">Schnellaktionen</h2>
        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
          <QuickActionCard
            title="Neuen Use Case erstellen"
            description="Starten Sie den 5-Schritte-Wizard"
            icon={
              <svg className="w-6 h-6 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
              </svg>
            }
            href="/sdk/advisory-board"
            color="bg-purple-50"
            projectId={projectId}
          />
          <QuickActionCard
            title="Security Screening"
            description="SBOM generieren und Schwachstellen scannen"
            icon={
              <svg className="w-6 h-6 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z" />
              </svg>
            }
            href="/sdk/screening"
            color="bg-red-50"
            projectId={projectId}
          />
          <QuickActionCard
            title="DSFA generieren"
            description="Datenschutz-Folgenabschaetzung erstellen"
            icon={
              <svg className="w-6 h-6 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12h6m-6 4h6m2 5H7a2 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>
            }
            href="/sdk/dsfa"
            color="bg-blue-50"
            projectId={projectId}
          />
          <QuickActionCard
            title="Legal RAG"
            description="Rechtliche Fragen stellen und Antworten erhalten"
            icon={
              <svg className="w-6 h-6 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 16l2.879-2.879m0 0a3 3 0 104.243-4.242 3 3 0 00-4.243 4.242zM21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
              </svg>
            }
            href="/sdk/rag"
            color="bg-green-50"
            projectId={projectId}
          />
        </div>
      </div>

      {/* Recent Activity */}
      {state.commandBarHistory.length > 0 && (
        <div>
          <h2 className="text-lg font-semibold text-gray-900 mb-4">Letzte Aktivitaeten</h2>
          <div className="bg-white rounded-xl border border-gray-200 divide-y divide-gray-100">
            {state.commandBarHistory.slice(0, 5).map(entry => (
              <div key={entry.id} className="flex items-center gap-4 px-4 py-3">
                <div
                  className={`w-8 h-8 rounded-full flex items-center justify-center ${
                    entry.success ? 'bg-green-100 text-green-600' : 'bg-red-100 text-red-600'
                  }`}
                >
                  {entry.success ? (
                    <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                    </svg>
                  ) : (
                    <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>
                  )}
                </div>
                <div className="flex-1">
                  <p className="text-sm font-medium text-gray-900">{entry.query}</p>
                  <p className="text-xs text-gray-500">
                    {new Date(entry.timestamp).toLocaleString('de-DE')}
                  </p>
                </div>
                <span className="px-2 py-1 text-xs bg-gray-100 text-gray-600 rounded-full">
                  {entry.type}
                </span>
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  )
}