'use client'

import { useState } from 'react'
import { useParams } from 'next/navigation'
import { REDUCTION_TYPES } from './_components/types'
import { HierarchyWarning } from './_components/HierarchyWarning'
import { MeasuresLibraryModal } from './_components/MeasuresLibraryModal'
import { SuggestMeasuresModal } from './_components/SuggestMeasuresModal'
import { MitigationForm } from './_components/MitigationForm'
import { MitigationCard } from './_components/MitigationCard'
import { ProtectiveMeasure } from './_components/types'
import { useMitigations } from './_hooks/useMitigations'

export default function MitigationsPage() {
  const params = useParams()
  const projectId = params.projectId as string

  const {
    hazards, loading, hierarchyWarning, setHierarchyWarning,
    measures, byType,
    fetchMeasuresLibrary, handleSubmit, handleAddSuggestedMeasure, handleVerify, handleDelete,
  } = useMitigations(projectId)

  const [showForm, setShowForm] = useState(false)
  const [preselectedType, setPreselectedType] = useState<'design' | 'protection' | 'information' | undefined>()
  const [showLibrary, setShowLibrary] = useState(false)
  const [libraryFilter, setLibraryFilter] = useState<string | undefined>()
  const [showSuggest, setShowSuggest] = useState(false)

  function handleOpenLibrary(type?: string) {
    setLibraryFilter(type)
    fetchMeasuresLibrary(type)
    setShowLibrary(true)
  }

  function handleSelectMeasure(measure: ProtectiveMeasure) {
    setShowLibrary(false)
    setShowForm(true)
    setPreselectedType(measure.reduction_type as 'design' | 'protection' | 'information')
  }

  function handleAddForType(type: 'design' | 'protection' | 'information') {
    setPreselectedType(type)
    setShowForm(true)
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-purple-600" />
      </div>
    )
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900 dark:text-white">Massnahmen</h1>
          <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">
            Risikominderung nach dem 3-Stufen-Verfahren: Design &rarr; Schutz &rarr; Information.
          </p>
        </div>
        <div className="flex items-center gap-3">
          {hazards.length > 0 && (
            <button
              onClick={() => setShowSuggest(true)}
              className="flex items-center gap-2 px-3 py-2 border border-green-300 text-green-700 rounded-lg hover:bg-green-50 transition-colors text-sm"
            >
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 3v2m6-2v2M9 19v2m6-2v2M5 9H3m2 6H3m18-6h-2m2 6h-2M7 19h10a2 2 0 002-2V7a2 2 0 00-2-2H7a2 2 0 00-2 2v10a2 2 0 002 2zM9 9h6v6H9V9z" />
              </svg>
              Vorschlaege
            </button>
          )}
          <button
            onClick={() => handleOpenLibrary()}
            className="flex items-center gap-2 px-4 py-2 bg-white border border-purple-300 text-purple-700 rounded-lg hover:bg-purple-50 transition-colors"
          >
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253" />
            </svg>
            Bibliothek
          </button>
          <button
            onClick={() => { setPreselectedType(undefined); setShowForm(true) }}
            className="flex items-center gap-2 px-4 py-2 bg-purple-600 text-white rounded-lg hover:bg-purple-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="M12 6v6m0 0v6m0-6h6m-6 0H6" />
            </svg>
            Massnahme hinzufuegen
          </button>
        </div>
      </div>

      {hierarchyWarning && <HierarchyWarning onDismiss={() => setHierarchyWarning(false)} />}

      {showForm && (
        <MitigationForm
          onSubmit={async (data) => {
            const ok = await handleSubmit(data)
            if (ok) { setShowForm(false); setPreselectedType(undefined) }
          }}
          onCancel={() => { setShowForm(false); setPreselectedType(undefined) }}
          hazards={hazards}
          preselectedType={preselectedType}
          onOpenLibrary={handleOpenLibrary}
        />
      )}

      {showLibrary && (
        <MeasuresLibraryModal
          measures={measures}
          onSelect={handleSelectMeasure}
          onClose={() => setShowLibrary(false)}
          filterType={libraryFilter}
        />
      )}

      {showSuggest && (
        <SuggestMeasuresModal
          hazards={hazards}
          projectId={projectId}
          onAddMeasure={handleAddSuggestedMeasure}
          onClose={() => setShowSuggest(false)}
        />
      )}

      {/* 3-Column Layout */}
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
        {(['design', 'protection', 'information'] as const).map((type) => {
          const config = REDUCTION_TYPES[type]
          const items = byType[type]
          return (
            <div key={type} className={`rounded-xl border ${config.color} p-4`}>
              <div className={`flex items-center gap-2 px-3 py-2 rounded-lg ${config.headerColor} mb-3`}>
                {config.icon}
                <div>
                  <h3 className="text-sm font-semibold">{config.label}</h3>
                  <p className="text-xs opacity-75">{config.description}</p>
                </div>
                <span className="ml-auto text-sm font-bold">{items.length}</span>
              </div>
              <div className="mb-3 flex flex-wrap gap-1">
                {config.subTypes.map((st) => (
                  <span key={st.value} className="text-xs px-1.5 py-0.5 rounded bg-white/60 text-gray-500 border border-gray-200/50">
                    {st.label}
                  </span>
                ))}
              </div>
              <div className="space-y-3">
                {items.map((m) => (
                  <MitigationCard key={m.id} mitigation={m} onVerify={handleVerify} onDelete={handleDelete} />
                ))}
              </div>
              <div className="mt-3 flex gap-2">
                <button
                  onClick={() => handleAddForType(type)}
                  className="flex-1 py-2 text-sm text-gray-500 hover:text-purple-600 hover:bg-white rounded-lg border border-dashed border-gray-300 hover:border-purple-300 transition-colors"
                >
                  + Hinzufuegen
                </button>
                <button
                  onClick={() => handleOpenLibrary(type)}
                  className="py-2 px-3 text-sm text-gray-400 hover:text-purple-600 hover:bg-white rounded-lg border border-dashed border-gray-300 hover:border-purple-300 transition-colors"
                  title="Aus Bibliothek waehlen"
                >
                  <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253" />
                  </svg>
                </button>
              </div>
            </div>
          )
        })}
      </div>
    </div>
  )
}