import { useState } from 'react'
import AudioPlayer from '@/components/AudioPlayer'

interface SentenceFillTestProps {
  word: string
  definition: string
  example: string
  exampleTranslation: string
  pronunciation?: string
  difficultyLevel: string
  exampleImage?: string
  onAnswer: (answer: string) => void
  onReportError: () => void
  onImageClick?: (image: string) => void
  disabled?: boolean
}

export const SentenceFillTest: React.FC<SentenceFillTestProps> = ({
  word,
  definition,
  example,
  exampleTranslation,
  pronunciation,
  difficultyLevel,
  exampleImage,
  onAnswer,
  onReportError,
  onImageClick,
  disabled = false
}) => {
  const [fillAnswer, setFillAnswer] = useState('')
  const [showResult, setShowResult] = useState(false)
  const [showHint, setShowHint] = useState(false)

  const handleSubmit = () => {
    if (disabled || showResult || !fillAnswer.trim()) return
    setShowResult(true)
    onAnswer(fillAnswer)
  }

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter' && !showResult && fillAnswer.trim()) {
      handleSubmit()
    }
  }

  const isCorrect = fillAnswer.toLowerCase().trim() === word.toLowerCase()
  const targetWordLength = word.length
  const inputWidth = Math.max(100, Math.max(targetWordLength * 12, fillAnswer.length * 12 + 20))

  // 將例句中的目標詞替換為輸入框
  const renderSentenceWithInput = () => {
    const parts = example.split(new RegExp(`\\b${word}\\b`, 'gi'))
    const matches = example.match(new RegExp(`\\b${word}\\b`, 'gi')) || []

    return (
      <div className="text-lg text-gray-700 leading-relaxed">
        {parts.map((part, index) => (
          <span key={index}>
            {part}
            {index < matches.length && (
              <span className="relative inline-block mx-1">
                <input
                  type="text"
                  value={fillAnswer}
                  onChange={(e) => setFillAnswer(e.target.value)}
                  onKeyDown={handleKeyDown}
                  placeholder=""
                  disabled={disabled || showResult}
                  className={`inline-block px-2 py-1 text-center bg-transparent focus:outline-none disabled:bg-gray-100 ${
                    fillAnswer
                      ? 'border-b-2 border-blue-500'
                      : 'border-b-2 border-dashed border-gray-400 focus:border-blue-400 focus:border-solid'
                  }`}
                  style={{ width: `${inputWidth}px` }}
                />
                {!fillAnswer && (
                  <span
                    className="absolute inset-0 flex items-center justify-center text-gray-400 pointer-events-none"
                    style={{ paddingBottom: '8px' }}
                  >
                    ____
                  </span>
                )}
              </span>
            )}
          </span>
        ))}
      </div>
    )
  }

  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>

      <div className="bg-white rounded-xl shadow-lg p-8">
        {/* 標題區 */}
        <div className="flex justify-between items-start mb-6">
          <h2 className="text-2xl font-bold text-gray-900">例句填空</h2>
          <span className="bg-blue-100 text-blue-800 text-xs px-2 py-1 rounded-full">
            {difficultyLevel}
          </span>
        </div>

        {/* 圖片區（如果有） */}
        {exampleImage && (
          <div className="mb-6">
            <div className="bg-gray-50 rounded-lg p-4">
              <h3 className="font-semibold text-gray-900 mb-2 text-left">圖片提示</h3>
              <img
                src={exampleImage}
                alt="Example illustration"
                className="w-full max-w-md mx-auto rounded-lg cursor-pointer"
                onClick={() => onImageClick?.(exampleImage)}
              />
            </div>
          </div>
        )}

        {/* 指示文字 */}
        <p className="text-lg text-gray-700 mb-6 text-left">
          請點擊例句中的空白處輸入正確的單字：
        </p>

        {/* 填空句子區域 */}
        <div className="mb-6">
          <div className="bg-gray-50 rounded-lg p-6">
            {renderSentenceWithInput()}
          </div>
        </div>

        {/* 操作按鈕 */}
        <div className="flex gap-3 mb-4">
          {!showResult && fillAnswer.trim() && (
            <button
              onClick={handleSubmit}
              className="px-6 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors"
            >
              確認答案
            </button>
          )}
          <button
            onClick={() => setShowHint(!showHint)}
            className="px-6 py-2 bg-gray-500 text-white rounded-lg hover:bg-gray-600 transition-colors"
          >
            {showHint ? '隱藏提示' : '顯示提示'}
          </button>
        </div>

        {/* 提示區域 */}
        {showHint && (
          <div className="mb-4 p-4 bg-yellow-50 border border-yellow-200 rounded-lg">
            <h4 className="font-semibold text-yellow-800 mb-2">詞彙定義：</h4>
            <p className="text-yellow-800">{definition}</p>
          </div>
        )}

        {/* 結果反饋區 */}
        {showResult && (
          <div className={`mt-6 p-6 rounded-lg w-full ${
            isCorrect
              ? 'bg-green-50 border border-green-200'
              : 'bg-red-50 border border-red-200'
          }`}>
            <p className={`font-semibold text-left text-xl mb-4 ${
              isCorrect ? 'text-green-700' : 'text-red-700'
            }`}>
              {isCorrect ? '正確！' : '錯誤！'}
            </p>

            {!isCorrect && (
              <div className="mb-4">
                <p className="text-gray-700 text-left">
                  正確答案是：<strong className="text-lg">{word}</strong>
                </p>
              </div>
            )}

            <div className="space-y-3">
              <div className="text-left">
                <p className="text-gray-600">
                  <strong>發音：</strong>
                  {pronunciation && <span className="mx-2">{pronunciation}</span>}
                  <AudioPlayer text={word} />
                </p>
              </div>

              <div className="text-left">
                <p className="text-gray-600">
                  <strong>完整例句：</strong>"{example}"
                </p>
                <p className="text-gray-500 text-sm">
                  <strong>翻譯：</strong>"{exampleTranslation}"
                </p>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  )
}