'use client'

import { useState, useEffect } from 'react'
import { createPortal } from 'react-dom'

/**
 * ClickableTextV2 組件架構說明
 *
 * 🎯 **Portal 設計解決方案**：
 * - 使用 React Portal 將彈窗渲染到 document.body
 * - 完全脫離父級 CSS 繼承，避免樣式污染
 * - 確保彈窗樣式與 vocab-designs 頁面的詞卡風格完全一致
 *
 * 🏗️ **組件架構**：
 * ```
 * ClickableTextV2
 * ├─ 文字容器 (text-lg) - 可點擊文字
 * └─ VocabPopup (Portal) - 彈窗渲染到 body，不受父級影響
 * ```
 *
 * ✅ **解決的問題**：
 * - CSS 繼承問題：Portal 完全脫離父級樣式
 * - 字體大小問題：彈窗使用標準字體大小
 * - 對齊問題：彈窗內容正確左對齊
 *
 * 🔧 **技術要點**：
 * - createPortal() 渲染到 document.body
 * - mounted state 確保只在客戶端渲染
 * - 保持原有 API 和功能不變
 */

// 更新的詞彙分析介面
interface WordAnalysis {
  word: string
  translation: string
  definition: string
  partOfSpeech: string
  pronunciation: string
  synonyms: string[]
  antonyms?: string[]
  isPhrase: boolean
  isHighValue: boolean // 高學習價值標記
  learningPriority: 'high' | 'medium' | 'low' // 學習優先級
  phraseInfo?: {
    phrase: string
    meaning: string
    warning: string
    colorCode: string // 片語顏色代碼
  }
  difficultyLevel: string
  costIncurred?: number // 點擊此詞彙的成本
}

interface ClickableTextProps {
  text: string
  analysis?: Record<string, WordAnalysis>
  highValueWords?: string[] // 高價值詞彙列表
  phrasesDetected?: Array<{
    phrase: string
    words: string[]
    colorCode: string
  }>
  onWordClick?: (word: string, analysis: WordAnalysis) => void
  onWordCostConfirm?: (word: string, cost: number) => Promise<boolean> // 收費確認
  onNewWordAnalysis?: (word: string, analysis: WordAnalysis) => void // 新詞彙分析資料回調
  onSaveWord?: (word: string, analysis: WordAnalysis) => Promise<void> // 保存詞彙回調
  remainingUsage?: number // 剩餘使用次數
}

export function ClickableTextV2({
  text,
  analysis,
  onWordClick,
  onWordCostConfirm,
  onNewWordAnalysis,
  onSaveWord,
  remainingUsage = 5
}: ClickableTextProps) {
  const [selectedWord, setSelectedWord] = useState<string | null>(null)
  const [popupPosition, setPopupPosition] = useState({ x: 0, y: 0, showBelow: false })
  const [showCostConfirm, setShowCostConfirm] = useState<{
    word: string
    cost: number
    position: { x: number, y: number }
  } | null>(null)
  const [isSavingWord, setIsSavingWord] = useState(false)
  const [mounted, setMounted] = useState(false)

  // 確保只在客戶端渲染 Portal
  useEffect(() => {
    setMounted(true)
  }, [])

  // 獲取CEFR等級顏色 - 與詞卡風格完全一致
  const getCEFRColor = (level: string) => {
    switch (level) {
      case 'A1': return 'bg-green-100 text-green-700 border-green-200'
      case 'A2': return 'bg-blue-100 text-blue-700 border-blue-200'
      case 'B1': return 'bg-yellow-100 text-yellow-700 border-yellow-200'
      case 'B2': return 'bg-orange-100 text-orange-700 border-orange-200'
      case 'C1': return 'bg-red-100 text-red-700 border-red-200'
      case 'C2': return 'bg-purple-100 text-purple-700 border-purple-200'
      default: return 'bg-gray-100 text-gray-700 border-gray-200'
    }
  }

  // 輔助函數：兼容大小寫屬性名稱和處理AI資料格式
  const getWordProperty = (wordData: any, propName: string) => {
    const lowerProp = propName.toLowerCase()
    const upperProp = propName.charAt(0).toUpperCase() + propName.slice(1)

    // 特殊處理同義詞 - 如果AI沒有提供，返回空數組
    if (propName === 'synonyms') {
      return wordData?.[lowerProp] || wordData?.[upperProp] || []
    }

    // 特殊處理例句 - 如果AI沒有提供，生成預設例句
    if (propName === 'example') {
      return wordData?.[lowerProp] || wordData?.[upperProp] || `This is an example sentence using ${wordData?.word || 'the word'}.`
    }

    // 特殊處理例句翻譯
    if (propName === 'exampleTranslation') {
      return wordData?.[lowerProp] || wordData?.[upperProp] || `這是使用 ${wordData?.word || '該詞'} 的例句翻譯。`
    }

    return wordData?.[lowerProp] || wordData?.[upperProp]
  }

  // 將文字分割成單字，保留空格
  const words = text.split(/(\s+|[.,!?;:])/g)

  const handleWordClick = async (word: string, event: React.MouseEvent) => {
    const cleanWord = word.toLowerCase().replace(/[.,!?;:]/g, '')
    const wordAnalysis = analysis?.[cleanWord]

    const rect = event.currentTarget.getBoundingClientRect()
    const viewportWidth = window.innerWidth
    const viewportHeight = window.innerHeight
    const popupWidth = 320 // popup寬度 w-80 = 320px
    const popupHeight = 400 // 估計popup高度

    // 智能水平定位，適應不同屏幕尺寸
    let x = rect.left + rect.width / 2
    const actualPopupWidth = Math.min(popupWidth, viewportWidth - 32) // 實際popup寬度
    const halfPopupWidth = actualPopupWidth / 2
    const padding = 16 // 最小邊距

    // 手機端特殊處理
    if (viewportWidth <= 640) { // sm斷點
      // 小屏幕時居中顯示，避免邊緣問題
      x = viewportWidth / 2
    } else {
      // 大屏幕時智能調整位置
      if (x + halfPopupWidth + padding > viewportWidth) {
        x = viewportWidth - halfPopupWidth - padding
      }
      if (x - halfPopupWidth < padding) {
        x = halfPopupWidth + padding
      }
    }

    // 計算垂直位置
    const spaceAbove = rect.top
    const showBelow = spaceAbove < popupHeight

    const position = {
      x: x,
      y: showBelow ? rect.bottom + 10 : rect.top - 10,
      showBelow: showBelow
    }

    if (wordAnalysis) {
      // 場景A：有預存資料的詞彙
      const isHighValue = getWordProperty(wordAnalysis, 'isHighValue')
      if (isHighValue) {
        // 高價值詞彙 → 直接免費顯示
        setPopupPosition(position)
        setSelectedWord(cleanWord)
        onWordClick?.(cleanWord, wordAnalysis)
      } else {
        // 低價值詞彙 → 直接顯示（移除付費限制）
        setPopupPosition(position)
        setSelectedWord(cleanWord)
        onWordClick?.(cleanWord, wordAnalysis)
      }
    } else {
      // 場景B：無預存資料的詞彙 → 即時調用 AI 查詢
      await queryWordWithAI(cleanWord, position)
    }
  }

  const handleCostConfirm = async () => {
    if (!showCostConfirm) return

    const confirmed = await onWordCostConfirm?.(showCostConfirm.word, showCostConfirm.cost)

    if (confirmed) {
      // 調用真實的單字查詢API
      try {
        const response = await fetch('http://localhost:5000/api/ai/query-word', {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            word: showCostConfirm.word,
            sentence: text,
            analysisId: null // 可以傳入分析ID
          })
        })

        if (response.ok) {
          const result = await response.json()
          if (result.success) {
            setPopupPosition({...showCostConfirm.position, showBelow: false})
            setSelectedWord(showCostConfirm.word)
            onWordClick?.(showCostConfirm.word, result.data.analysis)
          }
        }
      } catch (error) {
        console.error('Query word API error:', error)
        // 回退到現有資料
        const wordAnalysis = analysis?.[showCostConfirm.word]
        if (wordAnalysis) {
          setPopupPosition({...showCostConfirm.position, showBelow: false})
          setSelectedWord(showCostConfirm.word)
          onWordClick?.(showCostConfirm.word, wordAnalysis)
        }
      }
    }

    setShowCostConfirm(null)
  }

  const closePopup = () => {
    setSelectedWord(null)
  }

  const handleSaveWord = async () => {
    if (!selectedWord || !analysis?.[selectedWord] || !onSaveWord) return

    setIsSavingWord(true)
    try {
      await onSaveWord(selectedWord, analysis[selectedWord])
      setSelectedWord(null) // 保存成功後關閉popup
    } catch (error) {
      console.error('Save word error:', error)
      alert(`保存詞彙失敗: ${error instanceof Error ? error.message : '未知錯誤'}`)
    } finally {
      setIsSavingWord(false)
    }
  }

  const queryWordWithAI = async (word: string, position: { x: number, y: number, showBelow: boolean }) => {
    try {
      console.log(`🤖 查詢單字: ${word}`)

      const response = await fetch('http://localhost:5000/api/ai/query-word', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          word: word,
          sentence: text,
          analysisId: null
        })
      })

      if (response.ok) {
        const result = await response.json()
        console.log('AI 查詢結果:', result)

        if (result.success && result.data?.analysis) {
          // 將新的分析資料通知父組件
          onNewWordAnalysis?.(word, result.data.analysis)

          // 顯示分析結果
          setPopupPosition(position)
          setSelectedWord(word)
          onWordClick?.(word, result.data.analysis)
        } else {
          alert(`❌ 查詢 "${word}" 失敗，請稍後再試`)
        }
      } else {
        throw new Error(`API 錯誤: ${response.status}`)
      }
    } catch (error) {
      console.error('AI 查詢錯誤:', error)
      alert(`❌ 查詢 "${word}" 時發生錯誤，請稍後再試`)
    }
  }

  const getWordClass = (word: string) => {
    const cleanWord = word.toLowerCase().replace(/[.,!?;:]/g, '')
    const wordAnalysis = analysis?.[cleanWord]

    const baseClass = "cursor-pointer transition-all duration-200 rounded relative mx-0.5 px-1 py-0.5"

    if (wordAnalysis) {
      // 有預存資料的詞彙
      const isHighValue = getWordProperty(wordAnalysis, 'isHighValue')
      const isPhrase = getWordProperty(wordAnalysis, 'isPhrase')

      // 高價值片語（黃色系）
      if (isHighValue && isPhrase) {
        return `${baseClass} bg-yellow-100 border-2 border-yellow-400 hover:bg-yellow-200 hover:shadow-sm transform hover:-translate-y-0.5`
      }

      // 高價值單字（綠色系）
      if (isHighValue && !isPhrase) {
        return `${baseClass} bg-green-100 border-2 border-green-400 hover:bg-green-200 hover:shadow-sm transform hover:-translate-y-0.5`
      }

      // 普通單字（藍色系）
      return `${baseClass} bg-blue-100 border-2 border-blue-300 hover:bg-blue-200 hover:shadow-sm`
    } else {
      // 無預存資料的詞彙（灰色虛線，表示需要即時查詢）
      return `${baseClass} border-2 border-dashed border-gray-300 hover:border-gray-400 bg-gray-50 hover:bg-gray-100`
    }
  }

  // 詞彙彈窗組件 - 使用 Portal 渲染
  const VocabPopup = () => {
    if (!selectedWord || !analysis?.[selectedWord] || !mounted) return null

    return createPortal(
      <>
        {/* 背景遮罩 */}
        <div
          className="fixed inset-0 bg-black bg-opacity-50 z-40"
          onClick={closePopup}
        />

        {/* 彈窗內容 - 完全脫離父級樣式 */}
        <div
          className="fixed z-50 bg-white rounded-xl shadow-lg w-96 max-w-md overflow-hidden"
          style={{
            left: `${popupPosition.x}px`,
            top: `${popupPosition.y}px`,
            transform: popupPosition.showBelow
              ? 'translate(-50%, 8px)'
              : 'translate(-50%, calc(-100% - 8px))',
            maxHeight: '85vh',
            overflowY: 'auto'
          }}
        >
          {/* 標題區 - 漸層背景 */}
          <div className="bg-gradient-to-br from-blue-50 to-indigo-50 p-5 border-b border-blue-200">
            {/* 關閉按鈕 - 獨立一行 */}
            <div className="flex justify-end mb-3">
              <button
                onClick={closePopup}
                className="text-gray-400 hover:text-gray-600 w-6 h-6 rounded-full bg-white bg-opacity-80 hover:bg-opacity-100 transition-all flex items-center justify-center"
              >
                ✕
              </button>
            </div>

            {/* 詞彙標題 */}
            <div className="mb-3">
              <h3 className="text-2xl font-bold text-gray-900">{getWordProperty(analysis[selectedWord], 'word')}</h3>
            </div>

            {/* 詞性、發音、播放按鈕、CEFR */}
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-3">
                <span className="text-sm bg-gray-100 text-gray-700 px-3 py-1 rounded-full">
                  {getWordProperty(analysis[selectedWord], 'partOfSpeech')}
                </span>
                <span className="text-base text-gray-600">{getWordProperty(analysis[selectedWord], 'pronunciation')}</span>
                <button className="w-8 h-8 bg-blue-600 rounded-full flex items-center justify-center text-white hover:bg-blue-700 transition-colors">
                  <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="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" />
                  </svg>
                </button>
              </div>

              {/* CEFR標籤 - 在播放按鈕那一行的最右邊 */}
              <span className={`px-3 py-1 rounded-full text-sm font-medium border ${getCEFRColor(getWordProperty(analysis[selectedWord], 'difficultyLevel'))}`}>
                {getWordProperty(analysis[selectedWord], 'difficultyLevel')}
              </span>
            </div>
          </div>

          {/* 內容區 - 彩色區塊設計 */}
          <div className="p-4 space-y-4">
            {/* 翻譯區塊 - 綠色 */}
            <div className="bg-green-50 rounded-lg p-3 border border-green-200">
              <h4 className="font-semibold text-green-900 mb-2 text-left text-sm">中文翻譯</h4>
              <p className="text-green-800 font-medium text-left">{getWordProperty(analysis[selectedWord], 'translation')}</p>
            </div>

            {/* 定義區塊 - 灰色 */}
            <div className="bg-gray-50 rounded-lg p-3 border border-gray-200">
              <h4 className="font-semibold text-gray-900 mb-2 text-left text-sm">英文定義</h4>
              <p className="text-gray-700 text-left text-sm leading-relaxed">{getWordProperty(analysis[selectedWord], 'definition')}</p>
            </div>

            {/* 同義詞區塊 - 紫色 */}
            {getWordProperty(analysis[selectedWord], 'synonyms')?.length > 0 && (
              <div className="bg-purple-50 rounded-lg p-3 border border-purple-200">
                <h4 className="font-semibold text-purple-900 mb-2 text-left text-sm">同義詞</h4>
                <div className="flex flex-wrap gap-1">
                  {getWordProperty(analysis[selectedWord], 'synonyms')?.slice(0, 4).map((synonym: string, idx: number) => (
                    <span key={idx} className="bg-white text-purple-700 px-2 py-1 rounded-full text-xs border border-purple-200 font-medium">
                      {synonym}
                    </span>
                  ))}
                </div>
              </div>
            )}
          </div>

          {/* 保存按鈕 - 底部平均延展 */}
          {onSaveWord && (
            <div className="p-4 pt-2">
              <button
                onClick={handleSaveWord}
                disabled={isSavingWord}
                className="w-full bg-primary text-white py-3 rounded-lg font-medium hover:bg-primary-hover transition-colors flex items-center justify-center gap-2"
              >
                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
                </svg>
                <span className="font-medium">{isSavingWord ? '保存中...' : '保存到詞卡'}</span>
              </button>
            </div>
          )}
        </div>
      </>,
      document.body
    )
  }

  return (
    <div className="relative">
      {/* 文字內容 */}
      <div className="text-lg leading-relaxed">
        {words.map((word, index) => {
          // 如果是空格或標點，直接顯示
          if (word.trim() === '' || /^[.,!?;:\s]+$/.test(word)) {
            return <span key={index}>{word}</span>
          }

          const className = getWordClass(word)
          const cleanWord = word.toLowerCase().replace(/[.,!?;:]/g, '')
          const wordAnalysis = analysis?.[cleanWord]
          const isHighValue = wordAnalysis?.isHighValue

          return (
            <span
              key={index}
              className={`${className} ${isHighValue ? 'relative' : ''}`}
              onClick={(e) => handleWordClick(word, e)}
            >
              {word}
              {isHighValue && (
                <span className="absolute -top-1 -right-1 text-xs">⭐</span>
              )}
            </span>
          )
        })}
      </div>

      {/* 使用 Portal 渲染的詞彙彈窗 */}
      <VocabPopup />

      {/* 收費確認對話框 - 保留原有功能 */}
      {showCostConfirm && (
        <>
          <div className="fixed inset-0 z-10" onClick={() => setShowCostConfirm(null)} />
          <div
            className="fixed z-20 bg-white border border-gray-300 rounded-lg shadow-lg p-4 w-72"
            style={{
              left: `${showCostConfirm.position.x}px`,
              top: `${showCostConfirm.position.y}px`,
              transform: 'translate(-50%, -100%)',
            }}
          >
            <div className="space-y-3">
              <div className="flex items-center justify-between">
                <h3 className="text-lg font-bold text-gray-900">
                  {showCostConfirm.word}
                </h3>
                <button
                  onClick={() => setShowCostConfirm(null)}
                  className="text-gray-400 hover:text-gray-600"
                >
                  ✕
                </button>
              </div>

              <div className="bg-orange-50 border border-orange-200 rounded-lg p-3">
                <div className="flex items-start gap-2">
                  <div className="text-orange-600 text-lg">💰</div>
                  <div>
                    <div className="text-sm font-medium text-orange-800">
                      低價值詞彙（需消耗額度）
                    </div>
                    <div className="text-sm text-orange-700 mt-1">
                      此查詢將消耗 <strong>{showCostConfirm.cost} 次</strong> 使用額度
                    </div>
                    <div className="text-sm text-orange-600 mt-1">
                      剩餘額度：<strong>{remainingUsage}</strong> 次
                    </div>
                  </div>
                </div>
              </div>

              <div className="flex gap-2">
                <button
                  onClick={handleCostConfirm}
                  className="flex-1 bg-blue-600 text-white py-2 px-4 rounded-lg text-sm font-medium hover:bg-blue-700 transition-colors"
                >
                  ✅ 確認查詢
                </button>
                <button
                  onClick={() => setShowCostConfirm(null)}
                  className="flex-1 bg-gray-200 text-gray-700 py-2 px-4 rounded-lg text-sm font-medium hover:bg-gray-300 transition-colors"
                >
                  ❌ 取消
                </button>
              </div>
            </div>
          </div>
        </>
      )}
    </div>
  )
}