'use client'

import React from 'react'
import Link from 'next/link'

interface LearningUnit {
  id: string
  label: string
  meta: string
  title: string
  topic: string | null
  grade_level: string | null
  status: string
  created_at: string
}

interface UnitProgress {
  total_stars?: number
  exercises?: Record<string, { completed?: number; correct?: number; incorrect?: number }>
}

interface UnitCardProps {
  unit: LearningUnit
  progress?: UnitProgress | null
  wordCount?: number
  isDark: boolean
  glassCard: string
  onDelete: (id: string) => void
}

const exerciseTypes = [
  { key: 'flashcards', label: 'Karten', icon: 'M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10', color: 'from-amber-500 to-orange-500' },
  { key: 'quiz', label: 'Quiz', icon: 'M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z', color: 'from-purple-500 to-pink-500' },
  { key: 'type', label: 'Tippen', icon: 'M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z', color: 'from-blue-500 to-cyan-500' },
  { key: 'listen', label: 'Hoeren', icon: 'M15.536 8.464a5 5 0 010 7.072m2.828-9.9a9 9 0 010 12.728M5.586 15H4a1 1 0 01-1-1v-4a1 1 0 011-1h1.586l4.707-4.707C10.923 3.663 12 4.109 12 5v14c0 .891-1.077 1.337-1.707.707L5.586 15z', color: 'from-green-500 to-emerald-500' },
  { key: 'match', label: 'Zuordnen', icon: 'M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1', color: 'from-indigo-500 to-violet-500' },
  { key: 'pronounce', label: 'Sprechen', icon: 'M19 11a7 7 0 01-7 7m0 0a7 7 0 01-7-7m7 7v4m0 0H8m4 0h4M12 1a3 3 0 00-3 3v8a3 3 0 006 0V4a3 3 0 00-3-3z', color: 'from-rose-500 to-red-500' },
]

export function UnitCard({ unit, progress, wordCount, isDark, glassCard, onDelete }: UnitCardProps) {
  const createdDate = new Date(unit.created_at).toLocaleDateString('de-DE', {
    day: '2-digit', month: '2-digit', year: 'numeric',
  })

  // Calculate progress percentage from exercises
  const totalCorrect = progress?.exercises
    ? Object.values(progress.exercises).reduce((s, e) => s + (e?.correct || 0), 0)
    : 0
  const totalAnswered = progress?.exercises
    ? Object.values(progress.exercises).reduce((s, e) => s + (e?.completed || 0), 0)
    : 0
  const progressPct = totalAnswered > 0 ? Math.round((totalCorrect / totalAnswered) * 100) : 0
  const stars = progress?.total_stars || 0

  return (
    <div className={`${glassCard} rounded-2xl p-5 transition-all hover:shadow-lg`}>
      {/* Header */}
      <div className="flex items-start justify-between mb-3">
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-2">
            <h3 className={`text-lg font-semibold truncate ${isDark ? 'text-white' : 'text-slate-900'}`}>
              {unit.label}
            </h3>
            {stars > 0 && (
              <span className="flex items-center gap-0.5 text-yellow-400 text-sm font-bold">
                <span>&#x2B50;</span>{stars}
              </span>
            )}
          </div>
          <p className={`text-sm mt-0.5 ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
            {wordCount ? `${wordCount} Woerter` : unit.meta} · {createdDate}
          </p>
        </div>
        <button
          onClick={() => onDelete(unit.id)}
          className={`p-1.5 rounded-lg transition-colors ${isDark ? 'hover:bg-white/10 text-white/30 hover:text-red-400' : 'hover:bg-slate-100 text-slate-300 hover:text-red-500'}`}
        >
          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
          </svg>
        </button>
      </div>

      {/* Progress Bar */}
      {totalAnswered > 0 && (
        <div className="mb-3">
          <div className={`h-2 rounded-full overflow-hidden ${isDark ? 'bg-white/10' : 'bg-slate-100'}`}>
            <div
              className="h-full rounded-full bg-gradient-to-r from-blue-500 to-green-500 transition-all duration-500"
              style={{ width: `${progressPct}%` }}
            />
          </div>
          <p className={`text-xs mt-1 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
            {progressPct}% · {totalCorrect}/{totalAnswered} richtig
          </p>
        </div>
      )}

      {/* Exercise Buttons */}
      <div className="flex flex-wrap gap-1.5">
        {exerciseTypes.map((ex) => (
          <Link
            key={ex.key}
            href={`/learn/${unit.id}/${ex.key}`}
            className={`flex items-center gap-1.5 px-3 py-2 rounded-xl text-xs font-medium text-white bg-gradient-to-r ${ex.color} hover:shadow-md hover:scale-[1.02] transition-all`}
          >
            <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d={ex.icon} />
            </svg>
            {ex.label}
          </Link>
        ))}
      </div>
    </div>
  )
}