'use client'

/**
 * Communication Tool - Lehrer-Eltern-Kommunikation
 *
 * KI-gestuetzte Unterstuetzung fuer professionelle, rechtlich fundierte
 * und empathische Elternkommunikation basierend auf den Prinzipien
 * der gewaltfreien Kommunikation (GFK).
 */

import { useState, useEffect } from 'react'
import {
  API_BASE,
  Option,
  LegalReference,
  GFKPrinciple,
  ValidationResult,
} from './_components/types'
import { InputForm } from './_components/InputForm'
import { OutputArea } from './_components/OutputArea'

export default function CommunicationToolPage() {
  // Form state
  const [communicationType, setCommunicationType] = useState('behavior')
  const [tone, setTone] = useState('professional')
  const [state, setState] = useState('NRW')
  const [studentName, setStudentName] = useState('')
  const [parentName, setParentName] = useState('')
  const [situation, setSituation] = useState('')
  const [additionalInfo, setAdditionalInfo] = useState('')

  // Options
  const [types, setTypes] = useState<Option[]>([])
  const [tones, setTones] = useState<Option[]>([])
  const [states, setStates] = useState<Option[]>([])

  // Result state
  const [generatedMessage, setGeneratedMessage] = useState('')
  const [subject, setSubject] = useState('')
  const [validation, setValidation] = useState<ValidationResult | null>(null)
  const [legalRefs, setLegalRefs] = useState<LegalReference[]>([])
  const [gfkPrinciples, setGfkPrinciples] = useState<GFKPrinciple[]>([])

  // UI state
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  // Fetch options on mount
  useEffect(() => {
    const fetchOptions = async () => {
      try {
        const [typesRes, tonesRes, statesRes, gfkRes] = await Promise.all([
          fetch(`${API_BASE}/v1/communication/types`),
          fetch(`${API_BASE}/v1/communication/tones`),
          fetch(`${API_BASE}/v1/communication/states`),
          fetch(`${API_BASE}/v1/communication/gfk-principles`),
        ])

        if (typesRes.ok) setTypes(await typesRes.json())
        if (tonesRes.ok) setTones(await tonesRes.json())
        if (statesRes.ok) setStates(await statesRes.json())
        if (gfkRes.ok) setGfkPrinciples(await gfkRes.json())
      } catch (e) {
        console.error('Fehler beim Laden der Optionen:', e)
        // Fallback-Werte
        setTypes([
          { value: 'behavior', label: 'Verhalten/Disziplin' },
          { value: 'academic', label: 'Schulleistungen' },
          { value: 'attendance', label: 'Fehlzeiten' },
          { value: 'meeting_invite', label: 'Einladung zum Gespraech' },
          { value: 'positive_feedback', label: 'Positives Feedback' },
          { value: 'concern', label: 'Bedenken aeussern' },
          { value: 'conflict', label: 'Konfliktloesung' },
        ])
        setTones([
          { value: 'professional', label: 'Professionell-freundlich' },
          { value: 'formal', label: 'Sehr foermlich' },
          { value: 'warm', label: 'Warmherzig' },
          { value: 'concerned', label: 'Besorgt' },
        ])
        setStates([
          { value: 'NRW', label: 'Nordrhein-Westfalen' },
          { value: 'BY', label: 'Bayern' },
          { value: 'BW', label: 'Baden-Wuerttemberg' },
        ])
      }
    }
    fetchOptions()
  }, [])

  // Generate message
  const handleGenerate = async () => {
    if (!studentName || !parentName || !situation) {
      setError('Bitte fuellen Sie alle Pflichtfelder aus.')
      return
    }

    setLoading(true)
    setError(null)

    try {
      const res = await fetch(`${API_BASE}/v1/communication/generate`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          communication_type: communicationType,
          tone,
          state,
          student_name: studentName,
          parent_name: parentName,
          situation,
          additional_info: additionalInfo || undefined,
        }),
      })

      if (!res.ok) {
        throw new Error(`Server-Fehler: ${res.status}`)
      }

      const data = await res.json()
      setGeneratedMessage(data.message)
      setSubject(data.subject)
      setValidation(data.validation)
      setLegalRefs(data.legal_references || [])
    } catch (e) {
      setError(`Fehler bei der Generierung: ${e instanceof Error ? e.message : 'Unbekannter Fehler'}`)
    } finally {
      setLoading(false)
    }
  }

  // Improve existing text
  const handleImprove = async () => {
    if (!generatedMessage) return

    setLoading(true)
    setError(null)

    try {
      const res = await fetch(`${API_BASE}/v1/communication/improve`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ text: generatedMessage }),
      })

      if (!res.ok) {
        throw new Error(`Server-Fehler: ${res.status}`)
      }

      const data = await res.json()
      if (data.was_improved) {
        setGeneratedMessage(data.improved_text)
        // Re-validate
        const valRes = await fetch(`${API_BASE}/v1/communication/validate`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ text: data.improved_text }),
        })
        if (valRes.ok) {
          setValidation(await valRes.json())
        }
      }
    } catch (e) {
      setError(`Fehler bei der Verbesserung: ${e instanceof Error ? e.message : 'Unbekannter Fehler'}`)
    } finally {
      setLoading(false)
    }
  }

  // Copy to clipboard
  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(generatedMessage)
      alert('In die Zwischenablage kopiert!')
    } catch (e) {
      console.error('Kopieren fehlgeschlagen:', e)
    }
  }

  return (
    <div className="min-h-screen bg-gray-50 py-8">
      <div className="max-w-6xl mx-auto px-4">
        {/* Header */}
        <div className="mb-8">
          <h1 className="text-3xl font-bold text-gray-900 mb-2">
            Kommunikationsassistent
          </h1>
          <p className="text-gray-600">
            KI-gestuetzte Unterstuetzung fuer professionelle Elternkommunikation
            nach den Prinzipien der gewaltfreien Kommunikation (GFK)
          </p>
        </div>

        <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
          <InputForm
            communicationType={communicationType}
            setCommunicationType={setCommunicationType}
            tone={tone}
            setTone={setTone}
            state={state}
            setState={setState}
            studentName={studentName}
            setStudentName={setStudentName}
            parentName={parentName}
            setParentName={setParentName}
            situation={situation}
            setSituation={setSituation}
            additionalInfo={additionalInfo}
            setAdditionalInfo={setAdditionalInfo}
            types={types}
            tones={tones}
            states={states}
            gfkPrinciples={gfkPrinciples}
            error={error}
            loading={loading}
            onGenerate={handleGenerate}
          />

          <OutputArea
            generatedMessage={generatedMessage}
            setGeneratedMessage={setGeneratedMessage}
            subject={subject}
            validation={validation}
            legalRefs={legalRefs}
            loading={loading}
            onImprove={handleImprove}
            onCopy={handleCopy}
          />
        </div>

        {/* Footer */}
        <div className="mt-8 text-center text-sm text-gray-500">
          <p>
            Hinweis: Die generierten Texte sind Vorschlaege und sollten vor dem
            Versand ueberprueft und ggf. angepasst werden.
          </p>
        </div>
      </div>
    </div>
  )
}