'use client'

import { useMemo } from 'react'
import type { FoundingWizardState, GeneratedDocument } from '@/lib/sdk/founding/types'
import { NOTARY_BUNDLE_DOCUMENTS } from '@/lib/sdk/founding/template-categories'

interface Props {
  state: FoundingWizardState
  update: <K extends keyof FoundingWizardState>(k: K, v: FoundingWizardState[K]) => void
  generating: boolean
  error: string | null
  onGenerate: () => Promise<GeneratedDocument[]>
}

const DOC_LABELS: Record<string, string> = {
  articles_of_association: 'Satzung',
  gesellschafterliste: 'Gesellschafterliste (§ 40 GmbHG)',
  gf_bestellungsbeschluss: 'Gesellschafterbeschluss zur GF-Bestellung',
  hrb_anmeldung: 'Handelsregister-Anmeldung',
  sha: 'Shareholders\' Agreement (SHA)',
  geschaeftsordnung_gf: 'Geschäftsordnung Geschäftsführung (GO-GF)',
  managing_director_employment_contract: 'GF-Dienstvertrag (pro GF)',
  ip_assignment_agreement: 'IP-Assignment (pro Gründer)',
  term_sheet: 'Term Sheet',
  convertible_loan_agreement: 'Wandeldarlehensvertrag',
  subscription_agreement: 'Beteiligungsvertrag',
  esop_plan: 'ESOP/VSOP-Plan',
  cap_table: 'Cap Table',
}

export function StepGenerate({ state, update, generating, error, onGenerate }: Props) {
  const toggleDoc = (docType: string) => {
    const next = state.selected_documents.includes(docType)
      ? state.selected_documents.filter(d => d !== docType)
      : [...state.selected_documents, docType]
    update('selected_documents', next)
  }

  const selectNotaryBundle = () => {
    update('selected_documents', [...NOTARY_BUNDLE_DOCUMENTS])
  }

  const summary = useMemo(() => ({
    name: state.basics.company_name,
    seat: state.basics.company_seat,
    stammkapital: state.capital.stammkapital_eur,
    num_gesellschafter: state.gesellschafter.length,
    num_gf: state.gesellschafter.filter(g => g.is_geschaeftsfuehrer).length,
  }), [state])

  return (
    <div className="space-y-6">
      <div className="bg-purple-50 border border-purple-200 rounded-lg p-4">
        <h3 className="font-semibold text-purple-900 mb-2">Zusammenfassung</h3>
        <dl className="grid grid-cols-2 gap-2 text-sm" data-testid="generate-summary">
          <dt className="text-gray-600">Firma:</dt><dd>{summary.name} ({state.basics.legal_form})</dd>
          <dt className="text-gray-600">Sitz:</dt><dd>{summary.seat}</dd>
          <dt className="text-gray-600">Stammkapital:</dt><dd>{summary.stammkapital.toLocaleString('de-DE')} €</dd>
          <dt className="text-gray-600">Gesellschafter:</dt><dd>{summary.num_gesellschafter}</dd>
          <dt className="text-gray-600">Geschäftsführer:</dt><dd>{summary.num_gf}</dd>
          <dt className="text-gray-600">Notar:</dt><dd>{state.notar.notary_name} ({state.notar.notary_place})</dd>
        </dl>
      </div>

      <div>
        <div className="flex justify-between items-center mb-3">
          <h3 className="font-semibold">Zu generierende Dokumente</h3>
          <button
            type="button"
            data-testid="select-notary-bundle"
            onClick={selectNotaryBundle}
            className="text-sm text-purple-600 hover:underline"
          >
            ➜ Notartermin-Bundle auswählen
          </button>
        </div>
        <div className="grid grid-cols-1 gap-2">
          {Object.entries(DOC_LABELS).map(([docType, label]) => (
            <label key={docType} className="flex items-start gap-3 p-2 hover:bg-gray-50 rounded">
              <input
                type="checkbox"
                data-testid={`doc-${docType}`}
                checked={state.selected_documents.includes(docType)}
                onChange={() => toggleDoc(docType)}
                className="mt-1"
              />
              <div className="flex-1">
                <div className="text-sm font-medium">{label}</div>
                <div className="text-xs text-gray-500">{docType}</div>
              </div>
              {NOTARY_BUNDLE_DOCUMENTS.includes(docType) && (
                <span className="text-xs bg-purple-100 text-purple-700 px-2 py-0.5 rounded">Notartermin</span>
              )}
            </label>
          ))}
        </div>
      </div>

      <div className="flex justify-between items-center pt-4 border-t">
        <p className="text-sm text-gray-500">
          {state.selected_documents.length} Dokument(e) ausgewählt
        </p>
        <button
          data-testid="generate-docs"
          onClick={onGenerate}
          disabled={generating || state.selected_documents.length === 0}
          className="px-6 py-3 bg-purple-600 text-white rounded-lg hover:bg-purple-700 disabled:opacity-50 font-medium"
        >
          {generating ? 'Generiere...' : 'Dokumente als Word generieren'}
        </button>
      </div>

      {error && (
        <div className="bg-red-50 border border-red-200 rounded-lg p-3 text-sm text-red-900" data-testid="generate-error">
          Fehler: {error}
        </div>
      )}

      {state.generated_documents && state.generated_documents.length > 0 && (
        <div className="bg-green-50 border border-green-200 rounded-lg p-4" data-testid="generated-docs">
          <h3 className="font-semibold text-green-900 mb-3">
            ✓ {state.generated_documents.length} Dokument(e) generiert
          </h3>
          <ul className="space-y-2">
            {state.generated_documents.map((doc, idx) => (
              <li key={idx} className="flex justify-between items-center bg-white rounded px-3 py-2 border border-green-200">
                <div>
                  <div className="text-sm font-medium">{doc.title}</div>
                  <div className="text-xs text-gray-500">{(doc.size_bytes / 1024).toFixed(1)} KB</div>
                </div>
                <a
                  href={doc.download_url}
                  download
                  data-testid={`download-${doc.document_type}`}
                  className="px-3 py-1.5 bg-green-600 text-white rounded text-sm hover:bg-green-700"
                >
                  Word herunterladen
                </a>
              </li>
            ))}
          </ul>
        </div>
      )}
    </div>
  )
}