import React, { useState, useRef } from 'react'

// 字段名转换函数：驼峰转下划线
const convertField = (obj) => {
  const map = {
    prefixSerial: 'prefix_serial',
    isGraded: 'is_graded',
    gradingCompany: 'grading_company',
    gradingScore: 'grading_score',
    threeStar: 'three_star',
    specialMark: 'special_mark',
    serialFeature: 'serial_feature',
    issueYear: 'issue_year',
    issueQuantity: 'issue_quantity',
    costPrice: 'cost_price',
    targetPrice: 'target_price',
    goalPrice: 'goal_price',
    repairFee: 'repair_fee',
    gradingFee: 'grading_fee'
  }
  const result = {}
  for (const key in obj) {
    result[map[key] || key] = obj[key]
  }
  return result
}

export default function BatchMode() {
  const [images, setImages] = useState([])
  const [currentIndex, setCurrentIndex] = useState(0)
  const [result, setResult] = useState(null)
  const [loading, setLoading] = useState(false)
  const [savedCount, setSavedCount] = useState(0)
  const fileInputRef = useRef(null)

  const statusOptions = [
    { value: 'in_collection', label: '收藏中' },
    { value: 'selling', label: '在售' },
    { value: 'sold', label: '已售' },
    { value: 'grading', label: '送评' },
    { value: 'transit', label: '在途' },
    { value: 'other', label: '其他' }
  ]
  
  const packagingOptions = [
    { value: '单张', label: '单张' },
    { value: '标十', label: '标十' },
    { value: '标百', label: '标百' },
    { value: '裸钞', label: '裸钞' }
  ]
  
  const categoryOptions = [
    { value: '自持', label: '自持' },
    { value: '寄存', label: '寄存' },
    { value: '寄售', label: '寄售' },
    { value: '共有', label: '共有' },
    { value: '寻号', label: '寻号' },
    { value: '其他', label: '其他' }
  ]
  
  const rarityOptions = [
    { value: '通货', label: '通货' },
    { value: '特色', label: '特色' },
    { value: '少见', label: '少见' },
    { value: '稀有', label: '稀有' },
    { value: '珍品', label: '珍品' },
    { value: '孤品', label: '孤品' }
  ]

  const handleChooseImages = (e) => {
    const files = Array.from(e.target.files || [])
    if (files.length > 0) {
      setImages(files.slice(0, 10))
      setCurrentIndex(0)
      setResult(null)
      setSavedCount(0)
      // Auto OCR first image
      processOCR(files[0])
    }
  }

  const processOCR = async (file) => {
    setLoading(true)
    try {
      const formData = new FormData()
      formData.append('image', file)
      
      const res = await fetch('/api/ocr', { method: 'POST', body: formData })
      const data = await res.json()
      const text = data.result || ''
      
      const parsed = { 
        name: '生肖纪念钞',
        ownership_type: '自持',
        rarity: '通货',
        status: 'in_collection',
        version: '',
        prefixSerial: '',
        packaging: '单张',
        isGraded: false,
        gradingCompany: '',
        gradingScore: '',
        threeStar: false,
        specialMark: '',
        serialFeature: '',
        denomination: '贰拾圆',
        issuer: '中国人民银行',
        issueYear: '2024',
        material: '塑料',
        issueQuantity: '一亿',
        costPrice: '',
        goalPrice: '',
        targetPrice: '',
        remark: ''
      }
      
      const v = text.match(/发行版别[：:]\s*([^\n]+)/)
      if (v) {
        parsed.version = v[1].trim()
        const yearMatch = v[1].match(/20\d{2}/)
        if (yearMatch) parsed.issueYear = yearMatch[0]
      }
      // 自动识别发行机构
      const issuerMatch = text.match(/发行机构[：:]\s*([^\n]+)/)
      if (issuerMatch) parsed.issuer = issuerMatch[1].trim()
      if (text.includes('三星') || text.includes('3星') || text.includes('★★★')) parsed.threeStar = true
      const d = text.match(/面额[：:]\s*([^\n]+)/)
      if (d) parsed.denomination = d[1].trim()
      const p = text.match(/冠字序号[：:]\s*([^\n]+)/)
      if (p) parsed.prefixSerial = p[1].trim()
      // 识别编号
      const codeMatch = text.match(/编号[：:]\s*([^\n]+)/)
      if (codeMatch) parsed.code = codeMatch[1].trim()
      const pk = text.match(/封装类型[：:]\s*([^\n]+)/)
      if (pk) {
        const pv = pk[1].trim()
        if (pv.includes('百')) parsed.packaging = '标百'
        else if (pv.includes('十')) parsed.packaging = '标十'
        else if (pv.includes('单')) parsed.packaging = '单张'
        else parsed.packaging = '裸钞'
      }
      const g = text.match(/是否评级[：:]\s*([^\n]+)/)
      if (g) parsed.isGraded = g[1].trim() === '是'
      const gc = text.match(/评级机构[：:]\s*([^\n]+)/)
      if (gc) parsed.gradingCompany = gc[1].trim()
      const gs = text.match(/评级分数[：:]\s*([^\n]+)/)
      if (gs) parsed.gradingScore = gs[1].trim()
      const sm = text.match(/特殊标识[：:]\s*([^\n]+)/)
      if (sm) parsed.specialMark = sm[1].trim()
      const sf = text.match(/号码特征[：:]\s*([^\n]+)/)
      if (sf) parsed.serialFeature = sf[1].trim()
      
      setResult(parsed)
    } catch (e) {
      console.error(e)
      alert('识别失败，请重试')
    }
    setLoading(false)
  }

  const updateResult = (field, value) => {
    setResult(prev => ({ ...prev, [field]: value }))
  }

  const handleSave = async (force = false) => {
    const token = localStorage.getItem('token')
    if (!token) {
      alert('请先登录')
      return
    }
    
    try {
      const saveData = convertField({ ...result, _forceSave: force })
      const res = await fetch('/api/collections', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token },
        body: JSON.stringify(saveData)
      })
      
      if (res.ok) {
        setSavedCount(prev => prev + 1)
        alert('保存成功！')
      } else {
        const data = await res.json()
        const errMsg = data.error || data.message || data.detail || '保存失败'
        // 检查重复
        if (errMsg.includes('E002') || errMsg.includes('已存在') || errMsg.includes('禁止重复') || errMsg.includes('重复')) {
          const confirmed = confirm('发现重复：冠字号 ' + (result.prefixSerial || '') + ' 已存在，是否继续保存？')
          if (confirmed) {
            await handleSave(true)  // 强制保存
            return
          }
        }
        alert(errMsg)
      }
    } catch (e) {
      alert('保存失败: ' + e.message)
    }
  }

  const handleNext = () => {
    if (currentIndex < images.length - 1) {
      setCurrentIndex(currentIndex + 1)
      setResult(null)
      processOCR(images[currentIndex + 1])
    }
  }

  const handlePrev = () => {
    if (currentIndex > 0) {
      setCurrentIndex(currentIndex - 1)
      setResult(null)
      processOCR(images[currentIndex - 1])
    }
  }

  const handleReOCR = () => {
    processOCR(images[currentIndex])
  }

  const handleReUpload = () => {
    setImages([])
    setCurrentIndex(0)
    setResult(null)
    setSavedCount(0)
    fileInputRef.current?.click()
  }

  // No images selected
  if (images.length === 0) {
    return (
      <div style={{ padding: '20px' }}>
        <div 
          onClick={() => fileInputRef.current?.click()}
          style={{
            minHeight: '50vh',
            background: 'rgba(255,255,255,0.03)',
            border: '2px dashed rgba(255,255,255,0.15)',
            borderRadius: '16px',
            display: 'flex',
            flexDirection: 'column',
            alignItems: 'center',
            justifyContent: 'center',
            cursor: 'pointer'
          }}
        >
          <div style={{ fontSize: '60px', opacity: 0.5 }}>📦</div>
          <div style={{ color: '#fff', fontSize: '16px', marginTop: '16px' }}>点击选择多张图片</div>
          <div style={{ color: '#94a3b8', fontSize: '13px', marginTop: '8px' }}>最多10张</div>
        </div>
        <input 
          ref={fileInputRef}
          type="file"
          accept="image/*"
          multiple
          onChange={handleChooseImages}
          style={{ display: 'none' }}
        />
      </div>
    )
  }

  const isSaved = savedCount > currentIndex

  return (
    <div style={{ padding: '16px', paddingBottom: '120px' }}>
      {/* Sticky Header */}
      <div style={{ position: 'sticky', top: 0, background: '#0f172a', padding: '12px 0', marginBottom: '12px', zIndex: 10, borderBottom: '1px solid rgba(255,255,255,0.1)' }}>
        <div style={{ color: '#fff', fontSize: '14px', marginBottom: '8px' }}>
          已保存: {savedCount} / {images.length} | 当前第 {currentIndex + 1} 张
        </div>
        <div style={{ display: 'flex', gap: '4px', flexWrap: 'wrap' }}>
          {images.map((_, i) => (
            <div key={i} style={{ 
              width: '24px', height: '24px', borderRadius: '4px', 
              background: i < savedCount ? '#22c55e' : (i === currentIndex ? '#fbbf24' : '#333'),
              color: '#fff', fontSize: '10px', display: 'flex', alignItems: 'center', justifyContent: 'center'
            }}>
              {i + 1}
            </div>
          ))}
        </div>
        {currentIndex === images.length - 1 && savedCount > 0 && (
          <button onClick={handleReUpload} style={{ marginTop: '12px', padding: '8px 16px', background: '#6366f1', color: '#fff', border: 'none', borderRadius: '6px', fontSize: '13px', cursor: 'pointer' }}>
            重新上传
          </button>
        )}
      </div>

      {/* Image */}
      <div style={{ marginBottom: '16px' }}>
        <img 
          src={URL.createObjectURL(images[currentIndex])} 
          alt="preview" 
          style={{ width: '100%', maxHeight: '200px', objectFit: 'contain', borderRadius: '8px' }}
        />
      </div>

      {/* Buttons - moved here */}
      <div style={{ display: 'flex', gap: '8px', marginBottom: '16px' }}>
        <button 
          onClick={handlePrev}
          disabled={currentIndex === 0}
          style={{ flex: 1, padding: '12px', background: currentIndex === 0 ? '#333' : 'rgba(255,255,255,0.1)', color: '#fff', border: 'none', borderRadius: '8px', cursor: currentIndex === 0 ? 'not-allowed' : 'pointer' }}
        >
          上一张
        </button>
        
        {currentIndex < images.length - 1 && (
          <button 
            onClick={handleNext}
            style={{ flex: 1, padding: '12px', background: '#6366f1', color: '#fff', border: 'none', borderRadius: '8px', cursor: 'pointer' }}
          >
            下一张
          </button>
        )}
        
        <button 
          onClick={handleReOCR}
          disabled={loading}
          style={{ flex: 1, padding: '12px', background: 'rgba(255,255,255,0.1)', color: '#fff', border: '1px solid rgba(255,255,255,0.2)', borderRadius: '8px', cursor: loading ? 'not-allowed' : 'pointer' }}
        >
          重新识别
        </button>
        <button 
          onClick={handleSave}
          disabled={!result || loading}
          style={{ flex: 1, padding: '12px', background: result && !loading ? '#22c55e' : '#333', color: '#fff', border: 'none', borderRadius: '8px', fontWeight: 'bold', cursor: result && !loading ? 'pointer' : 'not-allowed' }}
        >
          保存结果
        </button>
      </div>

      {loading && (
        <div style={{ textAlign: 'center', padding: '20px', color: '#fbbf24' }}>🤖 AI识别中...</div>
      )}

      {result && !loading && (
        <>
          {/* 基本信息 */}
          <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '14px', marginBottom: '12px' }}>
            <div style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px' }}>基本信息</div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>名称</div>
              <input type="text" value={result.name || ''} onChange={(e) => updateResult('name', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>编号</div>
              <input type="text" value={result.code || ''} onChange={(e) => updateResult('code', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>持仓类型</div>
              <select value={result.ownership_type || '自持'} onChange={(e) => updateResult('ownership_type', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}>
                {categoryOptions.map(o => <option key={o.value} value={o.value} style={{color:'#000'}}>{o.label}</option>)}
              </select>
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>珍惜度</div>
              <select value={result.rarity || '通货'} onChange={(e) => updateResult('rarity', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}>
                {rarityOptions.map(o => <option key={o.value} value={o.value} style={{color:'#000'}}>{o.label}</option>)}
              </select>
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>冠字序号</div>
              <input type="text" value={result.prefixSerial || ''} onChange={(e) => updateResult('prefixSerial', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fbbf24', fontSize: '13px', fontFamily: 'monospace' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>版别</div>
              <input type="text" value={result.version || ''} onChange={(e) => updateResult('version', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>状态</div>
              <select value={result.status || 'in_collection'} onChange={(e) => updateResult('status', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}>
                {statusOptions.map(o => <option key={o.value} value={o.value} style={{color:'#000'}}>{o.label}</option>)}
              </select>
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>封装</div>
              <select value={result.packaging || '单张'} onChange={(e) => updateResult('packaging', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}>
                {packagingOptions.map(o => <option key={o.value} value={o.value} style={{color:'#000'}}>{o.label}</option>)}
              </select>
            </div>
          </div>

          {/* 评级信息 */}
          <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '14px', marginBottom: '12px' }}>
            <div style={{ display: 'flex', alignItems: 'center', gap: '10px', marginBottom: '10px', padding: '8px', background: result.isGraded ? 'rgba(34, 197, 94, 0.15)' : 'rgba(255,255,255,0.03)', borderRadius: '6px', cursor: 'pointer' }}
              onClick={() => updateResult('isGraded', !result.isGraded)}>
              <div style={{ width: '22px', height: '22px', borderRadius: '4px', border: '2px solid', borderColor: result.isGraded ? '#22c55e' : '#64748b', backgroundColor: result.isGraded ? '#22c55e' : 'transparent', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
                {result.isGraded && <span style={{color:'#fff',fontSize:'14px'}}>✓</span>}
              </div>
              <span style={{color:'#fff',fontSize:'13px'}}>已评级</span>
            </div>
            
            {result.isGraded && (
              <>
                <div style={{ marginBottom: '10px' }}>
                  <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>评级公司</div>
                  <input type="text" value={result.gradingCompany || ''} onChange={(e) => updateResult('gradingCompany', e.target.value)}
                    style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
                </div>
                <div style={{ marginBottom: '10px' }}>
                  <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>评级分数</div>
                  <input type="text" value={result.gradingScore || ''} onChange={(e) => updateResult('gradingScore', e.target.value)}
                    style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fbbf24', fontSize: '13px' }} />
                </div>
              </>
            )}
            
            <div style={{ display: 'flex', alignItems: 'center', gap: '10px', padding: '8px', background: result.threeStar ? 'rgba(34, 197, 94, 0.15)' : 'rgba(255,255,255,0.03)', borderRadius: '6px', cursor: 'pointer' }}
              onClick={() => updateResult('threeStar', !result.threeStar)}>
              <div style={{ width: '22px', height: '22px', borderRadius: '4px', border: '2px solid', borderColor: result.threeStar ? '#22c55e' : '#64748b', backgroundColor: result.threeStar ? '#22c55e' : 'transparent', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
                {result.threeStar && <span style={{color:'#fff',fontSize:'14px'}}>✓</span>}
              </div>
              <span style={{color:'#fff',fontSize:'13px'}}>三星</span>
            </div>
          </div>

          {/* 特殊信息 */}
          <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '14px', marginBottom: '12px' }}>
            <div style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px' }}>特殊信息</div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>发行机构</div>
              <input type="text" value={result.issuer || ''} onChange={(e) => updateResult('issuer', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>年份</div>
              <input type="text" value={result.issueYear || ''} onChange={(e) => updateResult('issueYear', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>特殊标识</div>
              <input type="text" value={result.specialMark || ''} onChange={(e) => updateResult('specialMark', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>号码特征</div>
              <input type="text" value={result.serialFeature || ''} onChange={(e) => updateResult('serialFeature', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>面额</div>
              <input type="text" value={result.denomination || ''} onChange={(e) => updateResult('denomination', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
          </div>

          {/* 价格信息 */}
          <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '14px', marginBottom: '16px' }}>
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>成本价</div>
              <input type="number" value={result.costPrice || ''} onChange={(e) => updateResult('costPrice', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} />
            </div>
            
            <div style={{ marginBottom: '10px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>出售价</div>
              <input type="number" value={result.targetPrice || ''} onChange={(e) => updateResult('targetPrice', e.target.value)}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fbbf24', fontSize: '13px' }} />
            </div>
          </div>

          {/* 备注 */}
          <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '14px', marginBottom: '16px' }}>
            <div style={{ marginBottom: '8px' }}>
              <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>备注</div>
              <textarea value={result.remark || ''} onChange={(e) => updateResult('remark', e.target.value)} rows={2}
                style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px', resize: 'none' }} />
            </div>
          </div>
        </>
      )}

      {/* Footer */}
      {savedCount > 0 && currentIndex === images.length - 1 && (
        <button onClick={handleReUpload} style={{ width: '100%', padding: '14px', background: '#6366f1', color: '#fff', border: 'none', borderRadius: '8px', fontSize: '15px', marginTop: '16px', cursor: 'pointer' }}>
          重新上传
        </button>
      )}

      <input 
        ref={fileInputRef}
        type="file"
        accept="image/*"
        multiple
        onChange={handleChooseImages}
        style={{ display: 'none' }}
      />
    </div>
  )
}