'use client'

import { useState, useEffect } 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('')
  const [usageCount, setUsageCount] = useState(0)
  const [isPremium] = useState(true)
  const [cacheStatus, setCacheStatus] = useState<{
    isCached: boolean
    cacheHit: boolean
    usingAI: boolean
    message: string
  } | null>(null)

  // 處理句子分析 - 使用真實AI API
  const handleAnalyzeSentence = async () => {
    console.log('🚀 handleAnalyzeSentence 被調用')
    console.log('📝 輸入文本:', textInput)

    if (!textInput.trim()) {
      console.log('❌ 文本為空，退出')
      return
    }

    if (!isPremium && usageCount >= 5) {
      console.log('❌ 使用次數超限')
      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
    }

    console.log('✅ 開始分析，設定 loading 狀態')
    setIsAnalyzing(true)

    try {
      // 調用真實的後端AI API
      console.log('🌐 發送API請求到:', 'http://localhost:5000/api/ai/analyze-sentence')
      const response = await fetch('http://localhost:5000/api/ai/analyze-sentence', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          inputText: textInput,
          analysisMode: 'full'
        })
      })

      console.log('📡 API響應狀態:', response.status, response.statusText)

      if (!response.ok) {
        throw new Error(`API 錯誤: ${response.status}`)
      }

      const result = await response.json()
      console.log('📦 完整API響應:', result)

      if (result.success) {
        // 設定快取狀態
        setCacheStatus({
          isCached: result.cached || false,
          cacheHit: result.cacheHit || false,
          usingAI: result.usingAI || false,
          message: result.message || '分析完成'
        })

        // 使用真實AI的回應資料 - 支援兩種key格式 (小寫/大寫)
        setSentenceAnalysis(result.data.wordAnalysis || result.data.WordAnalysis || {})

        // 安全處理 sentenceMeaning - 支援兩種key格式 (小寫/大寫)
        const sentenceMeaning = result.data.sentenceMeaning || result.data.SentenceMeaning || {}
        const translation = sentenceMeaning.Translation || sentenceMeaning.translation || '翻譯處理中...'
        const explanation = sentenceMeaning.Explanation || sentenceMeaning.explanation || '解釋處理中...'

        setSentenceMeaning(translation + ' ' + explanation)

        setGrammarCorrection(result.data.grammarCorrection || result.data.GrammarCorrection || { hasErrors: false })
        setFinalText(result.data.finalAnalysisText || result.data.FinalAnalysisText || textInput)
        setShowAnalysisView(true)
        setUsageCount(prev => prev + 1)
      } else {
        throw new Error(result.error || '分析失敗')
      }
    } catch (error) {
      console.error('Error analyzing sentence:', error)
      alert(`分析句子時發生錯誤: ${error instanceof Error ? error.message : '未知錯誤'}`)
    } 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 handleGenerate = async () => {
    if (!textInput.trim()) return

    setIsGenerating(true)

    try {
      const response = await fetch('http://localhost:5000/api/ai/test/generate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          inputText: textInput,
          extractionType: extractionType,
          cardCount: cardCount
        })
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const result = await response.json()

      if (result.success) {
        setGeneratedCards(result.data)
        setShowPreview(true)
        setShowAnalysisView(false)
      } else {
        throw new Error(result.error || '生成詞卡失敗')
      }
    } catch (error) {
      console.error('Error generating cards:', error)
      alert(`生成詞卡時發生錯誤: ${error instanceof Error ? error.message : '未知錯誤'}`)
    } finally {
      setIsGenerating(false)
    }
  }

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

      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {!showAnalysisView && !showPreview ? (
          <div className="max-w-4xl mx-auto">
            <h1 className="text-3xl font-bold mb-8">AI 智能生成詞卡</h1>

            {/* 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</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>
            </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> */}

            {/* Action Buttons */}
            <div className="space-y-4">
              {/* 句子分析按鈕 */}
              <button
                onClick={handleAnalyzeSentence}
                disabled={isAnalyzing || (mode === 'manual' && (!textInput || textInput.length > 300)) || (mode === 'screenshot')}
                className="w-full bg-blue-600 text-white py-4 rounded-lg font-semibold hover:bg-blue-700 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>
                    正在分析句子... (AI 分析約需 3-5 秒)
                  </span>
                ) : (
                  '🔍 分析句子'
                )}
              </button>


              {/* 使用次數顯示 */}
              <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>
        ) : showAnalysisView ? (
          /* 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">句子分析結果</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}
              />
            )}

            {/* 原始句子顯示 */}
            <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
              <div className="flex items-center justify-between mb-4">
                <h2 className="text-lg font-semibold">句子分析</h2>
                {cacheStatus && (
                  <div className={`inline-flex items-center px-3 py-1 rounded-full text-sm font-medium ${
                    cacheStatus.isCached
                      ? 'bg-green-100 text-green-800'
                      : 'bg-blue-100 text-blue-800'
                  }`}>
                    {cacheStatus.isCached ? (
                      <>
                        <span className="mr-1">💾</span>
                        <span>快取結果</span>
                      </>
                    ) : (
                      <>
                        <span className="mr-1">🤖</span>
                        <span>AI 分析</span>
                      </>
                    )}
                  </div>
                )}
              </div>
              <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">點擊查詢單字意思</h2>

              <div className="p-4 bg-blue-50 rounded-lg border-l-4 border-blue-400 mb-4">
                <p className="text-sm text-blue-800">
                  💡 <strong>使用說明：</strong>點擊下方句子中的任何單字，可以立即查看詳細意思。<br/>
                  🟡 <strong>黃色邊框 + ⭐</strong> = 高價值片語（免費點擊）<br/>
                  🟢 <strong>綠色邊框 + ⭐</strong> = 高價值單字（免費點擊）<br/>
                  🔵 <strong>藍色下劃線</strong> = 普通單字（點擊扣 1 次）
                </p>
              </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)
                    // 這裡可以整合從分析結果生成詞卡的功能
                  }}
                  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>
        ) : (
          /* 現有的詞卡預覽功能保持不變 */
          <div className="max-w-4xl mx-auto">
            <div className="flex items-center justify-between mb-6">
              <h1 className="text-3xl font-bold">預覽生成的詞卡</h1>
              <div className="flex gap-2">
                <button
                  onClick={() => {
                    setShowPreview(false)
                    setShowAnalysisView(true)
                  }}
                  className="text-gray-600 hover:text-gray-900"
                >
                  ← 返回分析
                </button>
                <span className="text-gray-300">|</span>
                <button
                  onClick={() => {
                    setShowPreview(false)
                    setShowAnalysisView(false)
                  }}
                  className="text-gray-600 hover:text-gray-900"
                >
                  ← 返回輸入
                </button>
              </div>
            </div>

            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
              {generatedCards.map((card, index) => (
                <div key={index} className="bg-white rounded-xl shadow-sm border border-gray-200 overflow-hidden">
                  {/* 詞卡內容 */}
                  <div className="p-6">
                    <div className="flex items-center justify-between mb-4">
                      <h3 className="text-xl font-bold text-gray-900">{card.word}</h3>
                      <span className="text-sm bg-gray-100 text-gray-600 px-2 py-1 rounded">
                        {card.partOfSpeech}
                      </span>
                    </div>

                    <div className="space-y-3">
                      <div>
                        <span className="text-sm font-medium text-gray-500">發音</span>
                        <p className="text-gray-700">{card.pronunciation}</p>
                      </div>

                      <div>
                        <span className="text-sm font-medium text-gray-500">翻譯</span>
                        <p className="text-gray-900 font-medium">{card.translation}</p>
                      </div>

                      <div>
                        <span className="text-sm font-medium text-gray-500">定義</span>
                        <p className="text-gray-700">{card.definition}</p>
                      </div>

                      <div>
                        <span className="text-sm font-medium text-gray-500">例句</span>
                        <p className="text-gray-700 italic">"{card.example}"</p>
                        <p className="text-gray-600 text-sm mt-1">{card.exampleTranslation}</p>
                      </div>

                      <div>
                        <span className="text-sm font-medium text-gray-500">同義詞</span>
                        <div className="flex flex-wrap gap-1 mt-1">
                          {card.synonyms.map((synonym: string, idx: number) => (
                            <span key={idx} className="text-xs bg-blue-100 text-blue-700 px-2 py-1 rounded-full">
                              {synonym}
                            </span>
                          ))}
                        </div>
                      </div>

                      <div className="flex items-center justify-between pt-2 border-t">
                        <span className="text-xs text-gray-500">難度: {card.difficultyLevel}</span>
                      </div>
                    </div>
                  </div>
                </div>
              ))}
            </div>

            {/* 操作按鈕 */}
            <div className="mt-8 flex justify-center gap-4">
              <button
                onClick={() => setShowPreview(false)}
                className="px-6 py-3 bg-gray-200 text-gray-700 rounded-lg hover:bg-gray-300 transition-colors"
              >
                🔄 重新生成
              </button>
              <button
                onClick={() => alert('保存功能開發中...')}
                className="px-6 py-3 bg-primary text-white rounded-lg hover:bg-primary-hover transition-colors"
              >
                💾 保存詞卡
              </button>
            </div>
          </div>
        )}
      </div>
    </div>
  )
}

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