'use client'

import { useState } from 'react'
import { ProtectedRoute } from '@/components/ProtectedRoute'
import { Navigation } from '@/components/Navigation'
import { ClickableTextV2 } from '@/components/ClickableTextV2'
import { GrammarCorrectionPanel } from '@/components/GrammarCorrectionPanel'

function GenerateContent() {
  const [mode, setMode] = useState<'manual' | 'screenshot'>('manual')
  const [textInput, setTextInput] = useState('')
  const [extractionType, setExtractionType] = useState<'vocabulary' | 'smart'>('vocabulary')
  const [cardCount, setCardCount] = useState(10)
  const [isGenerating, setIsGenerating] = useState(false)
  const [isAnalyzing, setIsAnalyzing] = useState(false)
  const [generatedCards, setGeneratedCards] = useState<any[]>([])
  const [showPreview, setShowPreview] = useState(false)
  const [showAnalysisView, setShowAnalysisView] = useState(false)
  const [sentenceAnalysis, setSentenceAnalysis] = useState<any>(null)
  const [sentenceMeaning, setSentenceMeaning] = useState('')
  const [grammarCorrection, setGrammarCorrection] = useState<any>(null)
  const [finalText, setFinalText] = useState('') // 最終用於分析的文本
  const [usageCount, setUsageCount] = useState(0)
  const [isPremium] = useState(false)

  // 模擬正確句子的分析資料
  const mockCorrectSentenceAnalysis = {
    meaning: "他在我們的會議中提出了這件事，但沒有人同意。這句話表達了在會議中有人提出某個議題或想法，但得不到其他與會者的認同。",
    grammarCorrection: {
      hasErrors: false,
      originalText: "He brought this thing up during our meeting and no one agreed.",
      correctedText: null,
      corrections: [],
      confidenceScore: 0.98
    },
    highValueWords: ["brought", "up", "meeting", "agreed"],
    words: {
      "brought": {
        word: "brought",
        translation: "帶來、提出",
        definition: "Past tense of bring; to take or carry something to a place",
        partOfSpeech: "verb",
        pronunciation: "/brɔːt/",
        synonyms: ["carried", "took", "delivered"],
        antonyms: ["removed", "took away"],
        isPhrase: true,
        isHighValue: true,
        learningPriority: "high",
        phraseInfo: {
          phrase: "bring up",
          meaning: "提出（話題）、養育",
          warning: "在這個句子中，\"brought up\" 是一個片語，意思是\"提出話題\"，而不是單純的\"帶來\"",
          colorCode: "#F59E0B"
        },
        difficultyLevel: "B1"
      },
      "up": {
        word: "up",
        translation: "向上",
        definition: "Toward a higher place or position",
        partOfSpeech: "adverb",
        pronunciation: "/ʌp/",
        synonyms: ["upward", "above"],
        antonyms: ["down", "below"],
        isPhrase: true,
        isHighValue: true,
        learningPriority: "high",
        phraseInfo: {
          phrase: "bring up",
          meaning: "提出（話題）、養育",
          warning: "\"up\" 在這裡是片語 \"bring up\" 的一部分，不是單獨的\"向上\"的意思",
          colorCode: "#F59E0B"
        },
        difficultyLevel: "B1"
      },
      "meeting": {
        word: "meeting",
        translation: "會議",
        definition: "An organized gathering of people for discussion",
        partOfSpeech: "noun",
        pronunciation: "/ˈmiːtɪŋ/",
        synonyms: ["conference", "assembly", "gathering"],
        antonyms: [],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "high",
        difficultyLevel: "B2"
      },
      "thing": {
        word: "thing",
        translation: "事情、東西",
        definition: "An object, fact, or situation",
        partOfSpeech: "noun",
        pronunciation: "/θɪŋ/",
        synonyms: ["object", "matter", "item"],
        antonyms: [],
        isPhrase: false,
        isHighValue: false,
        learningPriority: "low",
        difficultyLevel: "A1",
        costIncurred: 1
      },
      "agreed": {
        word: "agreed",
        translation: "同意",
        definition: "Past tense of agree; to have the same opinion",
        partOfSpeech: "verb",
        pronunciation: "/əˈɡriːd/",
        synonyms: ["consented", "accepted", "approved"],
        antonyms: ["disagreed", "refused"],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "medium",
        difficultyLevel: "B1"
      }
    }
  }

  // 模擬有語法錯誤的句子分析資料
  const mockErrorSentenceAnalysis = {
    meaning: "我昨天去學校遇見了我的朋友們。這句話描述了過去發生的事情，表達了去學校並遇到朋友的經歷。",
    grammarCorrection: {
      hasErrors: true,
      originalText: "I go to school yesterday and meet my friends.",
      correctedText: "I went to school yesterday and met my friends.",
      corrections: [
        {
          position: { start: 2, end: 4 },
          errorType: "tense_mismatch",
          original: "go",
          corrected: "went",
          reason: "過去式時態修正：句子中有 'yesterday'，應使用過去式",
          severity: "high"
        },
        {
          position: { start: 29, end: 33 },
          errorType: "tense_mismatch",
          original: "meet",
          corrected: "met",
          reason: "過去式時態修正：與 'went' 保持時態一致",
          severity: "high"
        }
      ],
      confidenceScore: 0.95
    },
    highValueWords: ["went", "yesterday", "met", "friends"],
    words: {
      "went": {
        word: "went",
        translation: "去、前往",
        definition: "Past tense of go; to move or travel to a place",
        partOfSpeech: "verb",
        pronunciation: "/went/",
        synonyms: ["traveled", "moved", "proceeded"],
        antonyms: ["stayed", "remained"],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "high",
        difficultyLevel: "A2"
      },
      "yesterday": {
        word: "yesterday",
        translation: "昨天",
        definition: "The day before today",
        partOfSpeech: "adverb",
        pronunciation: "/ˈjestədeɪ/",
        synonyms: ["the day before"],
        antonyms: ["tomorrow", "today"],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "medium",
        difficultyLevel: "A1"
      },
      "met": {
        word: "met",
        translation: "遇見、認識",
        definition: "Past tense of meet; to encounter or come together with",
        partOfSpeech: "verb",
        pronunciation: "/met/",
        synonyms: ["encountered", "saw", "found"],
        antonyms: ["avoided", "missed"],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "high",
        difficultyLevel: "A2"
      },
      "friends": {
        word: "friends",
        translation: "朋友們",
        definition: "People you like and know well",
        partOfSpeech: "noun",
        pronunciation: "/frends/",
        synonyms: ["companions", "buddies", "pals"],
        antonyms: ["enemies", "strangers"],
        isPhrase: false,
        isHighValue: true,
        learningPriority: "medium",
        difficultyLevel: "A1"
      },
      "school": {
        word: "school",
        translation: "學校",
        definition: "A place where children go to learn",
        partOfSpeech: "noun",
        pronunciation: "/skuːl/",
        synonyms: ["educational institution"],
        antonyms: [],
        isPhrase: false,
        isHighValue: false,
        learningPriority: "low",
        difficultyLevel: "A1",
        costIncurred: 1
      }
    }
  }

  // 處理句子分析
  const handleAnalyzeSentence = async () => {
    if (!textInput.trim()) return

    if (!isPremium && usageCount >= 5) {
      alert('❌ 免費用戶 3 小時內只能分析 5 次句子，請稍後再試或升級到付費版本')
      return
    }

    setIsAnalyzing(true)

    try {
      await new Promise(resolve => setTimeout(resolve, 2500))

      // 根據輸入文本決定使用哪個模擬資料
      const hasGrammarErrors = textInput.toLowerCase().includes('go to school yesterday') ||
                              textInput.toLowerCase().includes('meet my friends')

      if (hasGrammarErrors) {
        setSentenceAnalysis(mockErrorSentenceAnalysis.words)
        setSentenceMeaning(mockErrorSentenceAnalysis.meaning)
        setGrammarCorrection(mockErrorSentenceAnalysis.grammarCorrection)
        setFinalText(mockErrorSentenceAnalysis.grammarCorrection.correctedText || textInput)
      } else {
        setSentenceAnalysis(mockCorrectSentenceAnalysis.words)
        setSentenceMeaning(mockCorrectSentenceAnalysis.meaning)
        setGrammarCorrection(mockCorrectSentenceAnalysis.grammarCorrection)
        setFinalText(textInput)
      }

      setShowAnalysisView(true)
      setUsageCount(prev => prev + 1)
    } catch (error) {
      console.error('Error analyzing sentence:', error)
      alert('分析句子時發生錯誤，請稍後再試')
    } finally {
      setIsAnalyzing(false)
    }
  }

  const handleAcceptCorrection = () => {
    if (grammarCorrection?.correctedText) {
      setFinalText(grammarCorrection.correctedText)
      alert('✅ 已採用修正版本，後續學習將基於正確的句子進行！')
    }
  }

  const handleRejectCorrection = () => {
    setFinalText(grammarCorrection?.originalText || textInput)
    alert('📝 已保持原始版本，將基於您的原始輸入進行學習。')
  }

  const getHighValueCount = () => {
    if (!sentenceAnalysis) return 0
    return Object.values(sentenceAnalysis).filter((word: any) => word.isHighValue).length
  }

  const getLowValueCount = () => {
    if (!sentenceAnalysis) return 0
    return Object.values(sentenceAnalysis).filter((word: any) => !word.isHighValue).length
  }

  return (
    <div className="min-h-screen bg-gray-50">
      {/* Navigation */}
      <Navigation />

      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {!showAnalysisView ? (
          <div className="max-w-4xl mx-auto">
            <h1 className="text-3xl font-bold mb-8">AI 智能語法修正 + 高價值標記系統</h1>

            {/* 功能說明 */}
            <div className="bg-gradient-to-r from-red-50 to-green-50 rounded-xl p-6 mb-6 border border-red-200">
              <h2 className="text-lg font-semibold mb-3 text-red-800">🔧 語法修正 + 高價值標記特色</h2>
              <div className="grid md:grid-cols-2 gap-4 text-sm">
                <div className="space-y-2">
                  <div className="flex items-center gap-2">
                    <span className="text-lg">❌</span>
                    <span><strong>智能錯誤檢測</strong> - 9種語法錯誤類型</span>
                  </div>
                  <div className="flex items-center gap-2">
                    <span className="text-lg">🔧</span>
                    <span><strong>自動修正建議</strong> - 詳細修正說明</span>
                  </div>
                </div>
                <div className="space-y-2">
                  <div className="flex items-center gap-2">
                    <span className="text-lg">⭐</span>
                    <span><strong>高價值標記</strong> - 基於修正後句子</span>
                  </div>
                  <div className="flex items-center gap-2">
                    <span className="text-lg">💰</span>
                    <span><strong>成本優化</strong> - 語法修正不額外收費</span>
                  </div>
                </div>
              </div>
            </div>

            {/* Input Mode Selection */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">原始例句類型</h2>
              <div className="grid grid-cols-2 gap-4">
                <button
                  onClick={() => setMode('manual')}
                  className={`p-4 rounded-lg border-2 transition-all ${
                    mode === 'manual'
                      ? 'border-primary bg-primary-light'
                      : 'border-gray-200 hover:border-gray-300'
                  }`}
                >
                  <div className="text-2xl mb-2">✍️</div>
                  <div className="font-semibold">手動輸入</div>
                  <div className="text-sm text-gray-600 mt-1">貼上或輸入英文文本</div>
                </button>
                <button
                  onClick={() => setMode('screenshot')}
                  disabled={!isPremium}
                  className={`p-4 rounded-lg border-2 transition-all relative ${
                    mode === 'screenshot'
                      ? 'border-primary bg-primary-light'
                      : isPremium
                      ? 'border-gray-200 hover:border-gray-300'
                      : 'border-gray-200 bg-gray-100 cursor-not-allowed opacity-60'
                  }`}
                >
                  <div className="text-2xl mb-2">📷</div>
                  <div className="font-semibold">影劇截圖</div>
                  <div className="text-sm text-gray-600 mt-1">上傳影劇截圖 (Phase 2)</div>
                  {!isPremium && (
                    <div className="absolute top-2 right-2 px-2 py-1 bg-yellow-100 text-yellow-700 text-xs rounded-full">
                      訂閱功能
                    </div>
                  )}
                </button>
              </div>
            </div>

            {/* Content Input */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">輸入英文文本 (更新：300字限制)</h2>
              <textarea
                value={textInput}
                onChange={(e) => {
                  const value = e.target.value
                  if (mode === 'manual' && value.length > 300) {
                    return // 阻止輸入超過300字
                  }
                  setTextInput(value)
                }}
                placeholder={mode === 'manual'
                  ? "輸入英文句子（最多300字）..."
                  : "貼上您想要學習的英文文本，例如影劇對話、文章段落..."
                }
                className={`w-full h-40 px-4 py-3 border rounded-lg focus:ring-2 focus:ring-primary focus:border-transparent outline-none resize-none ${
                  mode === 'manual' && textInput.length >= 280 ? 'border-yellow-400' :
                  mode === 'manual' && textInput.length >= 300 ? 'border-red-400' : 'border-gray-300'
                }`}
              />
              <div className="mt-2 flex justify-between text-sm">
                <span className={`${
                  mode === 'manual' && textInput.length >= 280 ? 'text-yellow-600' :
                  mode === 'manual' && textInput.length >= 300 ? 'text-red-600' : 'text-gray-600'
                }`}>
                  {mode === 'manual' ? `最多 300 字元 • 目前：${textInput.length} 字元` : `最多 5000 字元 • 目前：${textInput.length} 字元`}
                </span>
                {mode === 'manual' && textInput.length > 250 && (
                  <span className={textInput.length >= 300 ? 'text-red-600' : 'text-yellow-600'}>
                    {textInput.length >= 300 ? '已達上限！' : `還可輸入 ${300 - textInput.length} 字元`}
                  </span>
                )}
              </div>

              {/* 預設示例 */}
              {!textInput && (
                <div className="mt-4 space-y-3">
                  <div className="p-3 bg-gray-50 rounded-lg">
                    <div className="text-sm text-gray-700 mb-2">
                      <strong>✅ 正確語法示例：</strong>
                    </div>
                    <button
                      onClick={() => setTextInput("He brought this thing up during our meeting and no one agreed.")}
                      className="text-sm text-green-600 hover:text-green-800 bg-green-50 px-3 py-1 rounded border border-green-200 w-full text-left"
                    >
                      He brought this thing up during our meeting and no one agreed.
                    </button>
                  </div>
                  <div className="p-3 bg-red-50 rounded-lg">
                    <div className="text-sm text-red-700 mb-2">
                      <strong>❌ 語法錯誤示例（測試修正功能）：</strong>
                    </div>
                    <button
                      onClick={() => setTextInput("I go to school yesterday and meet my friends.")}
                      className="text-sm text-red-600 hover:text-red-800 bg-red-50 px-3 py-1 rounded border border-red-200 w-full text-left"
                    >
                      I go to school yesterday and meet my friends.
                    </button>
                  </div>
                </div>
              )}
            </div>

            {/* Extraction Type Selection */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">萃取方式</h2>
              <div className="grid grid-cols-2 gap-4">
                <button
                  onClick={() => setExtractionType('vocabulary')}
                  className={`p-4 rounded-lg border-2 transition-all ${
                    extractionType === 'vocabulary'
                      ? 'border-primary bg-primary-light'
                      : 'border-gray-200 hover:border-gray-300'
                  }`}
                >
                  <div className="text-2xl mb-2">📖</div>
                  <div className="font-semibold">詞彙萃取</div>
                  <div className="text-sm text-gray-600 mt-1">查詢字典 API 並標記 CEFR</div>
                </button>
                <button
                  onClick={() => setExtractionType('smart')}
                  className={`p-4 rounded-lg border-2 transition-all ${
                    extractionType === 'smart'
                      ? 'border-primary bg-primary-light'
                      : 'border-gray-200 hover:border-gray-300'
                  }`}
                >
                  <div className="text-2xl mb-2">🤖</div>
                  <div className="font-semibold">智能萃取</div>
                  <div className="text-sm text-gray-600 mt-1">AI 分析片語和俚語</div>
                </button>
              </div>
            </div>

            {/* 分析按鈕 */}
            <div className="space-y-4">
              <button
                onClick={handleAnalyzeSentence}
                disabled={isAnalyzing || (mode === 'manual' && (!textInput || textInput.length > 300)) || (mode === 'screenshot')}
                className="w-full bg-primary text-white py-4 rounded-lg font-semibold hover:bg-primary-hover transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
              >
                {isAnalyzing ? (
                  <span className="flex items-center justify-center">
                    <svg className="animate-spin -ml-1 mr-3 h-5 w-5 text-white" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
                      <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                      <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                    </svg>
                    正在檢查語法並標記高價值詞彙...
                  </span>
                ) : (
                  '🔍 語法檢查 + 高價值詞彙分析'
                )}
              </button>

              <div className="text-center text-sm text-gray-600">
                {isPremium ? (
                  <span className="text-green-600">🌟 付費用戶：無限制使用</span>
                ) : (
                  <span className={usageCount >= 4 ? 'text-red-600' : usageCount >= 3 ? 'text-yellow-600' : 'text-gray-600'}>
                    免費用戶：已使用 {usageCount}/5 次 (3小時內)
                    {usageCount >= 5 && <span className="block text-red-500 mt-1">已達上限，請稍後再試</span>}
                  </span>
                )}
              </div>
            </div>
          </div>
        ) : (
          /* 句子分析視圖 */
          <div className="max-w-4xl mx-auto">
            <div className="flex items-center justify-between mb-6">
              <h1 className="text-3xl font-bold">語法檢查 + 高價值標記結果</h1>
              <button
                onClick={() => setShowAnalysisView(false)}
                className="text-gray-600 hover:text-gray-900"
              >
                ← 返回
              </button>
            </div>

            {/* 語法修正面板 */}
            {grammarCorrection && (
              <GrammarCorrectionPanel
                correction={grammarCorrection}
                onAcceptCorrection={handleAcceptCorrection}
                onRejectCorrection={handleRejectCorrection}
              />
            )}

            {/* 分析統計 */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">分析統計</h2>
              <div className="grid grid-cols-3 gap-4">
                <div className="text-center p-3 bg-green-50 rounded-lg">
                  <div className="text-2xl font-bold text-green-600">{getHighValueCount()}</div>
                  <div className="text-sm text-green-700">高價值詞彙</div>
                  <div className="text-xs text-green-600">⭐ 免費點擊</div>
                </div>
                <div className="text-center p-3 bg-blue-50 rounded-lg">
                  <div className="text-2xl font-bold text-blue-600">{getLowValueCount()}</div>
                  <div className="text-sm text-blue-700">普通詞彙</div>
                  <div className="text-xs text-blue-600">💰 點擊收費</div>
                </div>
                <div className="text-center p-3 bg-gray-50 rounded-lg">
                  <div className="text-2xl font-bold text-gray-600">1</div>
                  <div className="text-sm text-gray-700">本次消耗</div>
                  <div className="text-xs text-gray-600">🔍 句子分析</div>
                </div>
              </div>
            </div>

            {/* 句子對比 */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">句子分析</h2>
              <div className="space-y-4">
                <div>
                  <h3 className="text-sm font-medium text-gray-700 mb-2">📝 用戶輸入</h3>
                  <div className="p-3 bg-gray-50 rounded-lg border">
                    <div className="text-base">{textInput}</div>
                  </div>
                </div>

                {finalText !== textInput && (
                  <div>
                    <h3 className="text-sm font-medium text-gray-700 mb-2">🎯 分析基礎（修正後）</h3>
                    <div className="p-3 bg-blue-50 rounded-lg border border-blue-200">
                      <div className="text-base font-medium">{finalText}</div>
                      <div className="text-xs text-blue-600 mt-1">✨ 已修正語法錯誤</div>
                    </div>
                  </div>
                )}

                <div>
                  <h3 className="text-sm font-medium text-gray-700 mb-2">📖 整句意思</h3>
                  <div className="text-gray-700 leading-relaxed p-3 bg-gray-50 rounded-lg">
                    {sentenceMeaning}
                  </div>
                </div>
              </div>
            </div>

            {/* 互動式文字 */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <h2 className="text-lg font-semibold mb-4">智能高價值標記 - 點擊查詢單字</h2>

              <div className="p-4 bg-gradient-to-r from-blue-50 to-green-50 rounded-lg border border-blue-200 mb-4">
                <p className="text-sm text-blue-800 mb-3">
                  <strong>💡 基於{finalText !== textInput ? '修正後' : '原始'}句子的智能分析：</strong>
                </p>
                <div className="grid grid-cols-1 md:grid-cols-3 gap-3 text-xs">
                  <div className="flex items-center gap-2">
                    <div className="px-2 py-1 bg-yellow-100 border-2 border-yellow-400 rounded">片語⭐</div>
                    <span>高價值片語（免費）</span>
                  </div>
                  <div className="flex items-center gap-2">
                    <div className="px-2 py-1 bg-green-100 border-2 border-green-400 rounded">單字⭐</div>
                    <span>高價值單字（免費）</span>
                  </div>
                  <div className="flex items-center gap-2">
                    <div className="px-2 py-1 border-b border-blue-300">普通</div>
                    <span>普通單字（扣1次）</span>
                  </div>
                </div>
              </div>

              <div className="p-6 bg-gray-50 rounded-lg border-2 border-dashed border-gray-300">
                <ClickableTextV2
                  text={finalText}
                  analysis={sentenceAnalysis}
                  remainingUsage={5 - usageCount}
                  onWordClick={(word, analysis) => {
                    console.log('Clicked word:', word, analysis)
                  }}
                  onWordCostConfirm={async (word, cost) => {
                    if (usageCount >= 5) {
                      alert('❌ 使用額度不足，無法查詢低價值詞彙')
                      return false
                    }

                    const confirmed = window.confirm(
                      `查詢 "${word}" 將消耗 ${cost} 次使用額度，您剩餘 ${5 - usageCount} 次。\n\n是否繼續？`
                    )

                    if (confirmed) {
                      setUsageCount(prev => prev + cost)
                      return true
                    }
                    return false
                  }}
                />
              </div>
            </div>

            {/* 操作按鈕 */}
            <div className="bg-white rounded-xl shadow-sm p-6">
              <div className="flex gap-4">
                <button
                  onClick={() => setShowAnalysisView(false)}
                  className="flex-1 bg-gray-200 text-gray-700 py-3 rounded-lg font-medium hover:bg-gray-300 transition-colors"
                >
                  🔄 分析新句子
                </button>
                <button
                  onClick={() => {
                    setShowAnalysisView(false)
                    setShowPreview(true)
                    // 這裡可以整合原有的詞卡生成功能
                    alert('詞卡生成功能整合中...')
                  }}
                  className="flex-1 bg-primary text-white py-3 rounded-lg font-medium hover:bg-primary-hover transition-colors"
                >
                  📖 生成詞卡
                </button>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  )
}

export default function GeneratePage() {
  return (
    <ProtectedRoute>
      <GenerateContent />
    </ProtectedRoute>
  )
}