'use client'

import { useState } from 'react'
import { ChevronRight, ChevronLeft, Check, GraduationCap, Settings, Timer } from 'lucide-react'

interface OnboardingModalProps {
  isOpen: boolean
  onClose: () => void
  onComplete: (data: { state?: string; schoolType?: string }) => void
}

const STATES = [
  'Baden-Wuerttemberg',
  'Bayern',
  'Berlin',
  'Brandenburg',
  'Bremen',
  'Hamburg',
  'Hessen',
  'Mecklenburg-Vorpommern',
  'Niedersachsen',
  'Nordrhein-Westfalen',
  'Rheinland-Pfalz',
  'Saarland',
  'Sachsen',
  'Sachsen-Anhalt',
  'Schleswig-Holstein',
  'Thueringen',
]

const SCHOOL_TYPES = [
  'Grundschule',
  'Hauptschule',
  'Realschule',
  'Gymnasium',
  'Gesamtschule',
  'Berufsschule',
  'Foerderschule',
  'Andere',
]

interface Step {
  id: number
  title: string
  description: string
  icon: typeof GraduationCap
}

const steps: Step[] = [
  {
    id: 1,
    title: 'Willkommen',
    description: 'Der Companion hilft Ihnen bei der Unterrichtsplanung und -durchfuehrung.',
    icon: GraduationCap,
  },
  {
    id: 2,
    title: 'Ihre Schule',
    description: 'Waehlen Sie Ihr Bundesland und Ihre Schulform.',
    icon: Settings,
  },
  {
    id: 3,
    title: 'Bereit!',
    description: 'Sie koennen jetzt mit dem Lesson-Modus starten.',
    icon: Timer,
  },
]

export function OnboardingModal({ isOpen, onClose, onComplete }: OnboardingModalProps) {
  const [currentStep, setCurrentStep] = useState(1)
  const [selectedState, setSelectedState] = useState('')
  const [selectedSchoolType, setSelectedSchoolType] = useState('')

  if (!isOpen) return null

  const canProceed = () => {
    if (currentStep === 2) {
      return selectedState !== '' && selectedSchoolType !== ''
    }
    return true
  }

  const handleNext = () => {
    if (currentStep < 3) {
      setCurrentStep(currentStep + 1)
    } else {
      onComplete({
        state: selectedState,
        schoolType: selectedSchoolType,
      })
    }
  }

  const handleBack = () => {
    if (currentStep > 1) {
      setCurrentStep(currentStep - 1)
    }
  }

  const currentStepData = steps[currentStep - 1]
  const Icon = currentStepData.icon

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center">
      {/* Backdrop */}
      <div className="absolute inset-0 bg-black/50 backdrop-blur-sm" />

      {/* Modal */}
      <div className="relative bg-white rounded-2xl shadow-xl w-full max-w-lg mx-4 overflow-hidden">
        {/* Progress Bar */}
        <div className="h-1 bg-slate-100">
          <div
            className="h-full bg-blue-600 transition-all duration-300"
            style={{ width: `${(currentStep / 3) * 100}%` }}
          />
        </div>

        {/* Content */}
        <div className="p-8">
          {/* Step Indicator */}
          <div className="flex items-center justify-center gap-2 mb-8">
            {steps.map((step) => (
              <div
                key={step.id}
                className={`
                  w-3 h-3 rounded-full transition-all
                  ${step.id === currentStep
                    ? 'bg-blue-600 scale-125'
                    : step.id < currentStep
                      ? 'bg-blue-600'
                      : 'bg-slate-200'
                  }
                `}
              />
            ))}
          </div>

          {/* Icon */}
          <div className="w-16 h-16 bg-blue-100 rounded-2xl flex items-center justify-center mx-auto mb-6">
            <Icon className="w-8 h-8 text-blue-600" />
          </div>

          {/* Title & Description */}
          <h2 className="text-2xl font-bold text-slate-900 text-center mb-2">
            {currentStepData.title}
          </h2>
          <p className="text-slate-600 text-center mb-8">
            {currentStepData.description}
          </p>

          {/* Step Content */}
          {currentStep === 1 && (
            <div className="space-y-4 text-center">
              <div className="grid grid-cols-3 gap-4">
                <div className="p-4 bg-blue-50 rounded-xl">
                  <div className="text-2xl mb-1">5</div>
                  <div className="text-xs text-slate-600">Phasen</div>
                </div>
                <div className="p-4 bg-green-50 rounded-xl">
                  <div className="text-2xl mb-1">45</div>
                  <div className="text-xs text-slate-600">Minuten</div>
                </div>
                <div className="p-4 bg-purple-50 rounded-xl">
                  <div className="text-2xl mb-1">∞</div>
                  <div className="text-xs text-slate-600">Flexibel</div>
                </div>
              </div>
              <p className="text-sm text-slate-500 mt-4">
                Einstieg → Erarbeitung → Sicherung → Transfer → Reflexion
              </p>
            </div>
          )}

          {currentStep === 2 && (
            <div className="space-y-4">
              {/* State Selection */}
              <div>
                <label className="block text-sm font-medium text-slate-700 mb-2">
                  Bundesland
                </label>
                <select
                  value={selectedState}
                  onChange={(e) => setSelectedState(e.target.value)}
                  className="w-full px-4 py-3 border border-slate-200 rounded-xl focus:ring-2 focus:ring-blue-500 focus:border-blue-500 bg-white"
                >
                  <option value="">Bitte waehlen...</option>
                  {STATES.map((state) => (
                    <option key={state} value={state}>
                      {state}
                    </option>
                  ))}
                </select>
              </div>

              {/* School Type Selection */}
              <div>
                <label className="block text-sm font-medium text-slate-700 mb-2">
                  Schulform
                </label>
                <select
                  value={selectedSchoolType}
                  onChange={(e) => setSelectedSchoolType(e.target.value)}
                  className="w-full px-4 py-3 border border-slate-200 rounded-xl focus:ring-2 focus:ring-blue-500 focus:border-blue-500 bg-white"
                >
                  <option value="">Bitte waehlen...</option>
                  {SCHOOL_TYPES.map((type) => (
                    <option key={type} value={type}>
                      {type}
                    </option>
                  ))}
                </select>
              </div>
            </div>
          )}

          {currentStep === 3 && (
            <div className="text-center space-y-4">
              <div className="w-20 h-20 bg-green-100 rounded-full flex items-center justify-center mx-auto">
                <Check className="w-10 h-10 text-green-600" />
              </div>
              <div className="p-4 bg-slate-50 rounded-xl">
                <p className="text-sm text-slate-600">
                  <strong>Bundesland:</strong> {selectedState || 'Nicht angegeben'}
                </p>
                <p className="text-sm text-slate-600">
                  <strong>Schulform:</strong> {selectedSchoolType || 'Nicht angegeben'}
                </p>
              </div>
              <p className="text-sm text-slate-500">
                Sie koennen diese Einstellungen jederzeit aendern.
              </p>
            </div>
          )}
        </div>

        {/* Footer */}
        <div className="flex items-center justify-between p-6 border-t border-slate-200 bg-slate-50">
          <button
            onClick={currentStep === 1 ? onClose : handleBack}
            className="flex items-center gap-2 px-4 py-2 text-slate-600 hover:bg-slate-200 rounded-lg transition-colors"
          >
            {currentStep === 1 ? (
              'Ueberspringen'
            ) : (
              <>
                <ChevronLeft className="w-4 h-4" />
                Zurueck
              </>
            )}
          </button>
          <button
            onClick={handleNext}
            disabled={!canProceed()}
            className={`
              flex items-center gap-2 px-6 py-2 rounded-lg font-medium
              transition-all duration-200
              ${canProceed()
                ? 'bg-blue-600 text-white hover:bg-blue-700'
                : 'bg-slate-200 text-slate-500 cursor-not-allowed'
              }
            `}
          >
            {currentStep === 3 ? (
              <>
                <Check className="w-4 h-4" />
                Fertig
              </>
            ) : (
              <>
                Weiter
                <ChevronRight className="w-4 h-4" />
              </>
            )}
          </button>
        </div>
      </div>
    </div>
  )
}