'use client'

import React, { useState } from 'react'
import {
  PRIORITY_COLORS,
  PRIORITY_LABELS,
  STATUS_COLORS,
  STATUS_LABELS,
  STATUS_NEXT,
  type Obligation,
} from '../_types'

export default function ObligationDetail({ obligation, onClose, onStatusChange, onEdit, onDelete }: {
  obligation: Obligation
  onClose: () => void
  onStatusChange: (id: string, status: string) => Promise<void>
  onEdit: () => void
  onDelete: (id: string) => Promise<void>
}) {
  const [saving, setSaving] = useState(false)

  const handleStatusCycle = async () => {
    setSaving(true)
    await onStatusChange(obligation.id, STATUS_NEXT[obligation.status])
    setSaving(false)
  }

  const handleDelete = async () => {
    if (!confirm('Pflicht wirklich loeschen?')) return
    await onDelete(obligation.id)
    onClose()
  }

  const daysUntil = obligation.deadline
    ? Math.ceil((new Date(obligation.deadline).getTime() - Date.now()) / 86400000)
    : null

  return (
    <div className="fixed inset-0 bg-black/40 z-50 flex items-end md:items-center justify-center p-4" onClick={e => e.target === e.currentTarget && onClose()}>
      <div className="bg-white rounded-2xl shadow-2xl w-full max-w-lg max-h-[85vh] overflow-y-auto">
        <div className="flex items-start justify-between p-6 border-b gap-4">
          <div className="flex-1">
            <div className="flex items-center gap-2 mb-1 flex-wrap">
              <span className={`px-2 py-0.5 text-xs rounded-full ${PRIORITY_COLORS[obligation.priority]}`}>{PRIORITY_LABELS[obligation.priority]}</span>
              <span className={`px-2 py-0.5 text-xs rounded-full ${STATUS_COLORS[obligation.status]}`}>{STATUS_LABELS[obligation.status]}</span>
              {obligation.source && (
                <span className="px-2 py-0.5 text-xs bg-purple-50 text-purple-700 rounded">{obligation.source} {obligation.source_article}</span>
              )}
            </div>
            <h2 className="text-base font-semibold text-gray-900">{obligation.title}</h2>
          </div>
          <button onClick={onClose} className="text-gray-400 hover:text-gray-600 flex-shrink-0">✕</button>
        </div>

        <div className="p-6 space-y-4 text-sm">
          {obligation.description && (
            <p className="text-gray-700 whitespace-pre-wrap">{obligation.description}</p>
          )}

          <div className="grid grid-cols-2 gap-3">
            <div>
              <span className="text-gray-500">Verantwortlich</span>
              <p className="font-medium text-gray-900">{obligation.responsible || '—'}</p>
            </div>
            <div>
              <span className="text-gray-500">Frist</span>
              <p className={`font-medium ${daysUntil !== null && daysUntil < 0 ? 'text-red-600' : 'text-gray-900'}`}>
                {obligation.deadline
                  ? `${new Date(obligation.deadline).toLocaleDateString('de-DE')}${daysUntil !== null ? ` (${daysUntil < 0 ? `${Math.abs(daysUntil)}d ueberfaellig` : `${daysUntil}d`})` : ''}`
                  : '—'}
              </p>
            </div>
          </div>

          {obligation.linked_systems?.length > 0 && (
            <div>
              <span className="text-gray-500">Betroffene Systeme</span>
              <div className="flex flex-wrap gap-1 mt-1">
                {obligation.linked_systems.map(s => (
                  <span key={s} className="px-2 py-0.5 text-xs bg-gray-100 text-gray-600 rounded">{s}</span>
                ))}
              </div>
            </div>
          )}

          {obligation.notes && (
            <div>
              <span className="text-gray-500">Notizen</span>
              <p className="text-gray-700 mt-1">{obligation.notes}</p>
            </div>
          )}

          {obligation.rule_code && (
            <div className="bg-purple-50 rounded-lg p-3">
              <span className="text-xs text-purple-600">Aus UCCA Assessment abgeleitet · Regel {obligation.rule_code}</span>
            </div>
          )}

          {obligation.created_at && (
            <p className="text-xs text-gray-400">
              Erstellt: {new Date(obligation.created_at).toLocaleDateString('de-DE')}
              {obligation.updated_at && obligation.updated_at !== obligation.created_at
                ? ` · Geaendert: ${new Date(obligation.updated_at).toLocaleDateString('de-DE')}`
                : ''}
            </p>
          )}
        </div>

        <div className="flex items-center justify-between gap-2 p-6 border-t flex-wrap">
          <div className="flex gap-2">
            <button
              onClick={handleDelete}
              className="px-3 py-1.5 text-xs text-red-600 hover:bg-red-50 rounded-lg border border-red-200"
            >
              Loeschen
            </button>
          </div>
          <div className="flex gap-2">
            <button onClick={onEdit} className="px-3 py-1.5 text-xs text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-lg">
              Bearbeiten
            </button>
            {obligation.status !== 'completed' && (
              <button
                onClick={handleStatusCycle}
                disabled={saving}
                className="px-4 py-1.5 text-xs bg-purple-600 text-white rounded-lg hover:bg-purple-700 disabled:opacity-50"
              >
                {saving ? '...' : STATUS_NEXT[obligation.status] === 'completed' ? 'Als erledigt markieren' : `→ ${STATUS_LABELS[STATUS_NEXT[obligation.status]]}`}
              </button>
            )}
          </div>
        </div>
      </div>
    </div>
  )
}
