import { useState, useRef, useEffect } from 'react'
import AudioPlayer from '@/components/AudioPlayer'

interface FlipMemoryTestProps {
  word: string
  definition: string
  example: string
  exampleTranslation: string
  pronunciation?: string
  synonyms?: string[]
  difficultyLevel: string
  onConfidenceSubmit: (level: number) => void
  onReportError: () => void
  disabled?: boolean
}

export const FlipMemoryTest: React.FC<FlipMemoryTestProps> = ({
  word,
  definition,
  example,
  exampleTranslation,
  pronunciation,
  synonyms = [],
  difficultyLevel,
  onConfidenceSubmit,
  onReportError,
  disabled = false
}) => {
  const [isFlipped, setIsFlipped] = useState(false)
  const [selectedConfidence, setSelectedConfidence] = useState<number | null>(null)
  const [cardHeight, setCardHeight] = useState<number>(400)
  const frontRef = useRef<HTMLDivElement>(null)
  const backRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    const updateCardHeight = () => {
      if (backRef.current) {
        const backHeight = backRef.current.scrollHeight

        // 響應式最小高度設定
        const minHeightByScreen = window.innerWidth <= 480 ? 300 :
                                  window.innerWidth <= 768 ? 350 : 400

        // 以背面內容高度為準，不設最大高度限制
        const finalHeight = Math.max(minHeightByScreen, backHeight)
        setCardHeight(finalHeight)
      }
    }

    // 延遲執行以確保內容已渲染
    const timer = setTimeout(updateCardHeight, 100)

    window.addEventListener('resize', updateCardHeight)
    return () => {
      clearTimeout(timer)
      window.removeEventListener('resize', updateCardHeight)
    }
  }, [word, definition, example, synonyms])

  const handleFlip = () => {
    if (!disabled) setIsFlipped(!isFlipped)
  }

  const handleConfidenceSelect = (level: number) => {
    if (disabled) return
    setSelectedConfidence(level)
    onConfidenceSubmit(level)
  }

  const confidenceLabels = {
    1: '完全不懂',
    2: '模糊',
    3: '一般',
    4: '熟悉',
    5: '非常熟悉'
  }

  return (
    <div className="relative">
      {/* 錯誤回報按鈕 */}
      <div className="flex justify-end mb-2">
        <button
          onClick={onReportError}
          className="px-3 py-2 rounded-md transition-colors text-gray-600 hover:text-gray-900"
        >
          🚩 回報錯誤
        </button>
      </div>

      {/* 翻卡容器 */}
      <div
        className={`card-container ${disabled ? 'pointer-events-none opacity-75' : 'cursor-pointer'}`}
        onClick={handleFlip}
        style={{ perspective: '1000px', height: `${cardHeight}px` }}
      >
        <div
          className={`card bg-white rounded-xl shadow-lg hover:shadow-xl transition-all duration-600 ${isFlipped ? 'rotate-y-180' : ''}`}
          style={{ transformStyle: 'preserve-3d', height: '100%' }}
        >
          {/* 正面 */}
          <div
            ref={frontRef}
            className="card-face card-front absolute w-full h-full"
            style={{ backfaceVisibility: 'hidden' }}
          >
            <div className="p-8 h-full">
              <div className="flex justify-between items-start mb-6">
                <h2 className="text-2xl font-bold text-gray-900">翻卡記憶</h2>
                <span className="bg-blue-100 text-blue-800 text-xs px-2 py-1 rounded-full">
                  {difficultyLevel}
                </span>
              </div>

              <div className="space-y-4">
                <p className="text-lg text-gray-700 mb-6 text-left">
                  點擊卡片翻面，根據你對單字的熟悉程度進行自我評估：
                </p>

                <div className="flex-1 flex items-center justify-center mt-6">
                  <div className="bg-gray-50 rounded-lg p-8 w-full text-center">
                    <h3 className="text-4xl font-bold text-gray-900 mb-6">{word}</h3>
                    <div className="flex items-center justify-center gap-3">
                      {pronunciation && (
                        <span className="text-lg text-gray-500">{pronunciation}</span>
                      )}
                      <div onClick={(e) => e.stopPropagation()}>
                        <AudioPlayer text={word} />
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>

          {/* 背面 */}
          <div
            ref={backRef}
            className="card-face card-back absolute w-full h-full"
            style={{ backfaceVisibility: 'hidden', transform: 'rotateY(180deg)' }}
          >
            <div className="p-8 h-full">
              <div className="flex justify-between items-start mb-6">
                <h2 className="text-2xl font-bold text-gray-900">翻卡記憶</h2>
                <span className="bg-blue-100 text-blue-800 text-xs px-2 py-1 rounded-full">
                  {difficultyLevel}
                </span>
              </div>

              <div className="space-y-4 pb-6">
                {/* 定義區塊 */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <h3 className="font-semibold text-gray-900 mb-2 text-left">定義</h3>
                  <p className="text-gray-700 text-left">{definition}</p>
                </div>

                {/* 例句區塊 */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <h3 className="font-semibold text-gray-900 mb-2 text-left">例句</h3>
                  <div className="relative">
                    <p className="text-gray-700 italic mb-2 text-left pr-12">{example}</p>
                    <div className="absolute bottom-0 right-0" onClick={(e) => e.stopPropagation()}>
                      <AudioPlayer text={example} />
                    </div>
                  </div>
                  <p className="text-gray-600 text-sm text-left">{exampleTranslation}</p>
                </div>

                {/* 同義詞區塊 */}
                {synonyms.length > 0 && (
                  <div className="bg-gray-50 rounded-lg p-4">
                    <h3 className="font-semibold text-gray-900 mb-2 text-left">同義詞</h3>
                    <div className="flex flex-wrap gap-2">
                      {synonyms.map((synonym, index) => (
                        <span
                          key={index}
                          className="bg-white text-gray-700 px-3 py-1 rounded-full text-sm border border-gray-200"
                        >
                          {synonym}
                        </span>
                      ))}
                    </div>
                  </div>
                )}

              </div>
            </div>
          </div>
        </div>
      </div>

      {/* 信心等級評估區 - 裸露在背景上 */}
      {(
        <div className="mt-6">
          <div className="grid grid-cols-5 gap-3">
            {[1, 2, 3, 4, 5].map(level => (
              <button
                key={level}
                onClick={() => handleConfidenceSelect(level)}
                disabled={disabled || selectedConfidence !== null}
                className={`py-4 px-3 border-2 rounded-lg transition-all text-center font-medium ${
                  selectedConfidence === level
                    ? 'bg-blue-500 text-white border-blue-500 shadow-lg'
                    : 'bg-white border-gray-300 text-gray-700 hover:bg-blue-50 hover:border-blue-400 shadow-sm'
                } ${disabled || selectedConfidence !== null ? 'opacity-50 cursor-not-allowed' : 'hover:shadow-md'}`}
              >
                <div className="text-lg font-semibold">
                  {confidenceLabels[level as keyof typeof confidenceLabels]}
                </div>
              </button>
            ))}
          </div>
        </div>
      )}

      <style jsx>{`
        .card-container {
          perspective: 1000px;
          transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
          min-height: 400px;
        }

        .card {
          position: relative;
          width: 100%;
          height: 100%;
          transform-style: preserve-3d;
          transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .rotate-y-180 {
          transform: rotateY(180deg);
        }

        .card-face {
          position: absolute;
          width: 100%;
          height: 100%;
          backface-visibility: hidden;
          overflow: hidden;
        }

        .card-front .p-8 {
          display: flex;
          flex-direction: column;
          min-height: 100%;
        }

        .card-back .p-8 {
          overflow: visible;
        }

        @media (max-width: 768px) {
          .card-container {
            min-height: 350px;
          }
        }

        @media (max-width: 480px) {
          .card-container {
            min-height: 300px;
          }

          .card-face .p-8 {
            padding: 1rem;
          }
        }
      `}</style>
    </div>
  )
}