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


// 通用 Input 组件
const Input = ({ form, handleChange, label, field, type = 'text', options = null }) => {
  const onChange = (e) => {
    const value = e.target.value
    if (type === 'number' && value !== '') {
      const num = parseFloat(value)
      handleChange(field, isNaN(num) ? '' : num)
    } else handleChange(field, value)
  }
  return (
    <div style={{ flex: 1, minWidth: '45%', marginBottom: '12px' }}>
      <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>{label}</div>
      {options ? (
        <select value={form[field] || ''} onChange={onChange}
          style={{ background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', color: '#fff', padding: '8px', borderRadius: '6px', width: '100%', fontSize: '13px' }}>
          <option value="">请选择</option>
          {options.map(o => <option key={o.value} value={o.value} style={{color:'#000'}}>{o.label}</option>)}
        </select>
      ) : (
        <input type={type} value={form[field] ?? ''} onChange={onChange}
          style={{ background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', color: '#fff', padding: '8px', borderRadius: '6px', width: '100%', fontSize: '13px' }} />
      )}
    </div>
  )
}

export default function Edit() {
  const params = new URLSearchParams(window.location.hash.split('?')[1] || '')
  const id = params.get('id')
  
  const [collection, setCollection] = useState(null)
  const [loading, setLoading] = useState(true)
  const [saving, setSaving] = useState(false)
  const [form, setForm] = useState({})
  const [showDelete, setShowDelete] = useState(false)
  const [collectionImages, setCollectionImages] = useState([])
  const fileInputRef = useRef(null)
  const [editingImageIndex, setEditingImageIndex] = useState(-1)

  useEffect(() => {
    if (id) {
      fetchDetail()
    }
  }, [id])

  // 图片上传处理
  const handleImageUpload = async (e) => {
    const files = Array.from(e.target.files)
    if (files.length === 0) return
    
    const token = localStorage.getItem('token')
    const maxImages = 3
    
    // 检查是否超过限制
    const currentCount = collection.images ? collection.images.length : 0
    if (editingImageIndex === -1 && currentCount + files.length > maxImages) {
      alert(`最多只能上传${maxImages}张图片`)
      return
    }
    
    // 更换图片（点击已有图片）
    if (editingImageIndex >= 0) {
      const file = files[0]
      const oldImage = collection.images[editingImageIndex]
      
      const imgFormData = new FormData()
      imgFormData.append('file', file)
      
      try {
        // 先上传新图片
        const uploadRes = await fetch(`/api/collections/upload-image?collection_id=${id}`, {
          method: 'POST',
          headers: { 'Authorization': 'Bearer ' + token },
          body: imgFormData
        })
        
        if (uploadRes.ok) {
          // 删除旧图片
          await fetch(`/api/collections/images/${oldImage.id}`, {
            method: 'DELETE',
            headers: { 'Authorization': 'Bearer ' + token }
          })
          
          // 重新加载详情
          await fetchDetail()
          alert('图片已更换')
        }
      } catch (err) {
        console.error('图片更换失败:', err)
        alert('更换失败，请重试')
      }
      
      setEditingImageIndex(-1)
      return
    }
    
    // 添加新图片
    for (const file of files) {
      const imgFormData = new FormData()
      imgFormData.append('file', file)
      
      try {
        const res = await fetch(`/api/collections/upload-image?collection_id=${id}`, {
          method: 'POST',
          headers: { 'Authorization': 'Bearer ' + token },
          body: imgFormData
        })
        
        if (res.ok) {
          // 重新加载藏品详情
          await fetchDetail()
        }
      } catch (err) {
        console.error('图片上传失败:', err)
      }
    }
  }

  const handleDeleteImage = async (imageId) => {
    if (!confirm('确定删除这张图片吗？')) return
    
    const token = localStorage.getItem('token')
    
    try {
      const res = await fetch(`/api/collections/images/${imageId}`, {
        method: 'DELETE',
        headers: { 'Authorization': 'Bearer ' + token }
      })
      
      if (res.ok) {
        await fetchDetail()
      }
    } catch (err) {
      console.error('图片删除失败:', err)
    }
  }

  const fetchDetail = async () => {
    setLoading(true)
    const token = localStorage.getItem('token')
    try {
      const res = await fetch(`/api/collections/${id}`, {
        headers: token ? { 'Authorization': 'Bearer ' + token } : {}
      })
      const data = await res.json()
      const item = (data.code === 200 ? data.data : data)
      if (item && item.id) {
        setCollection(item)
        // 设置特殊信息默认值
        const yearMatch = item.version ? item.version.match(/(20\d{2})/) : null
        const defaultForm = {
          ...item,
          issuer: item.issuer || '中国人民银行',
          issueYear: item.issueYear || (yearMatch ? yearMatch[1] : '2024'),
          material: item.material || '塑料钞',
          issueQuantity: item.issueQuantity || '1 亿'
        }
        setForm(defaultForm)
        // 加载图片
        if (item.images && Array.isArray(item.images)) {
          setCollectionImages(item.images)
        }
      }
    } catch (e) {
      console.error('加载详情失败:', e)
    }
    setLoading(false)
  }

  const handleChange = (key, value) => {
    setForm({ ...form, [key]: value })
    // 填入出售价时自动把状态改为"已售"
    if (key === 'targetPrice' && value) {
      setForm(prev => ({ ...prev, status: 'sold' }))
    }
    // 版别变化时同步发行年份
    if (key === 'version') {
      const yearMatch = value.match(/(20\d{2})/)
      if (yearMatch) {
        setForm(prev => ({ ...prev, issueYear: yearMatch[1] }))
      }
    }
  }

  const handleSave = async () => {
    setSaving(true)
    setError('')
    const token = localStorage.getItem('token')
    
    // 1. 先检查是否重复（同版别、同冠字号）
    if (form.prefixSerial) {
      const checkRes = await fetch(`/api/collections?search=${encodeURIComponent(form.prefixSerial)}`, {
        headers: { 'Authorization': 'Bearer ' + token }
      })
      const checkData = await checkRes.json()
      const collections = checkData.data || checkData || []
      const duplicate = collections.find(c => 
        c.version === form.version && 
        c.prefixSerial === form.prefixSerial &&
        c.id !== id  // 排除自己
      )
      if (duplicate) {
        setError('已经录入过同版同号藏品！')
        setSaving(false)
        return
      }
    }
    
    // 转换字段名：camelCase 转字段编码
    const convertField = (obj) => {
      const map = {
        // f99 系统字段
        id: 'f99_90_id',
        userId: 'f99_91_user_id',
        createdAt: 'f99_92_created_at',
        updatedAt: 'f99_93_updated_at',
        // f01 基本信息
        name: 'f01_01_name',
        code: 'f01_02_code',
        category: 'f01_03_category',
        status: 'f01_04_status',
        remark: 'f01_05_remark',
        // f02 详细字段
        prefixSerial: 'f02_10_prefix_serial',
        version: 'f02_11_version',
        packaging: 'f02_12_packaging',
        rarity: 'f02_13_rarity',
        // f03 评级信息
        isGraded: 'f03_20_is_graded',
        gradingCompany: 'f03_21_grading_company',
        gradingScore: 'f03_22_grading_score',
        threeStar: 'f03_23_three_star',
        // f04 特殊信息
        specialMark: 'f04_30_special_mark',
        serialFeature: 'f04_31_serial_feature',
        issuer: 'f04_32_issuer',
        issueYear: 'f04_33_issue_year',
        material: 'f04_34_material',
        denomination: 'f04_35_denomination',
        issueQuantity: 'f04_36_issue_quantity',
        // f05 价格信息
        costPrice: 'f05_40_cost_price',
        targetPrice: 'f05_41_target_price',
        goalPrice: 'f05_42_goal_price',
        repairFee: 'f05_43_repair_fee',
        gradingFee: 'f05_44_grading_fee',
        // f06 其他信息
        purpose: 'f06_50_purpose'
      }
      const result = {}
      // 数字字段列表
      const numberFields = ['costPrice', 'targetPrice', 'goalPrice', 'repairFee', 'gradingFee']
      for (const key in obj) {
        let value = obj[key]
        // 过滤空字符串为 null
        if (value === '' || value === null) {
          value = null
        }
        // 数字字段转换为浮点数
        else if (numberFields.includes(key)) {
          value = parseFloat(value)
          if (isNaN(value)) value = null
        }
        result[map[key] || key] = value
      }
      return result
    }
    try {
      const res = await fetch(`/api/collections/${id}`, {
        method: 'PUT',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer ' + token
        },
        body: JSON.stringify(convertField(form))
      })
      if (res.ok) {
        alert('保存成功！')
        // 刷新首页统计数据
        if (window.refreshHome) {
          window.refreshHome()
        }
        window.location.hash = '#/detail?id=' + id
      } else {
        const data = await res.json()
        alert('保存失败: ' + (data.error || '未知错误'))
      }
    } catch (e) {
      alert('保存失败: ' + e.message)
    }
    setSaving(false)
  }

  const handleDelete = () => {
    setShowDelete(true)
  }

  const doDelete = async () => {
    const token = localStorage.getItem('token')
    try {
      const res = await fetch(`/api/collections/${id}`, {
        method: 'DELETE',
        headers: {
          'Authorization': 'Bearer ' + token
        }
      })
      if (res.ok) {
        alert('删除成功！')
        if (window.refreshList) window.refreshList()
        window.location.hash = '#/list'
      } else {
        alert('删除失败')
      }
    } catch (e) {
      alert('删除失败')
    }
    setShowDelete(false)
  }

  const goBack = () => {
    window.location.hash = '#/detail?id=' + id
  }

  const statusOptions = [
    { value: 'in_collection', label: '收藏中' },
    { value: 'selling', label: '出售中' },
    { value: 'sold', label: '已售' },
    { value: 'grading', label: '送评中' },
    { value: 'repairing', label: '修复中' },
    { value: 'transit', label: '在途中' },
    { value: 'other', label: '其他' }
  ]

  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' }
  ]

  if (loading) {
    return <div style={{ padding: '40px', textAlign: 'center', color: '#94a3b8' }}>加载中...</div>
  }

  return (
    <div style={{ background: '#0f172a', minHeight: '100vh', overflowY: 'auto', paddingBottom: '120px' }}>
      {/* 顶部 */}
      <div style={{ padding: '16px', background: 'rgba(255,255,255,0.02)', borderBottom: '1px solid rgba(255,255,255,0.05)', display: 'flex', alignItems: 'center', position: 'sticky', top: 0, zIndex: 100 }}>
        <button onClick={goBack} style={{ background: 'none', border: 'none', fontSize: '20px', cursor: 'pointer', padding: '8px', color: '#fff' }}>←</button>
        <span style={{ fontSize: '18px', fontWeight: 'bold', marginLeft: '8px', color: '#fff' }}>编辑藏品</span>
      </div>

      <div style={{ padding: '16px' }}>
        {/* 图片预览区域 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '12px' }}>
            <div style={{ color: '#fbbf24', fontSize: '13px', fontWeight: 'bold' }}>藏品图片</div>
            {collectionImages.length > 0 && (
              <button
                onClick={() => fileInputRef.current?.click()}
                style={{
                  padding: '6px 12px',
                  background: 'rgba(34, 197, 94, 0.2)',
                  color: '#22c55e',
                  border: '1px solid #22c55e',
                  borderRadius: '6px',
                  fontSize: '12px',
                  cursor: 'pointer',
                  display: 'flex',
                  alignItems: 'center',
                  gap: '4px'
                }}
              >
                📷 更换图片
              </button>
            )}
          </div>
          
          <input
            ref={fileInputRef}
            type="file"
            accept="image/*"
            onChange={handleImageUpload}
            style={{ display: 'none' }}
          />
          
          {collectionImages.length > 0 ? (
            <div style={{ display: 'grid', gridTemplateColumns: '1fr', gap: '12px' }}>
              {collectionImages.map((img, index) => (
                <div key={img.id || index} style={{ position: 'relative' }}>
                  <img 
                    src={`http://120.26.133.10:3000/${img.path || `uploads/collections/${img.filename}`}`} 
                    alt={img.original_name || img.filename || '藏品图片'}
                    style={{ 
                      width: '100%', 
                      aspectRatio: '1.5', 
                      objectFit: 'contain', 
                      borderRadius: '12px', 
                      border: '2px solid #10b981',
                      boxShadow: '0 4px 12px rgba(0,0,0,0.3)',
                      background: 'rgba(0,0,0,0.3)'
                    }} 
                  />
                  <div style={{
                    position: 'absolute',
                    top: '8px',
                    left: '8px',
                    background: 'rgba(0,0,0,0.6)',
                    color: '#fff',
                    padding: '4px 8px',
                    borderRadius: '4px',
                    fontSize: '12px'
                  }}>{index + 1}/{collectionImages.length}</div>
                </div>
              ))}
            </div>
          ) : (
            <div
              onClick={() => fileInputRef.current?.click()}
              style={{
                aspectRatio: '1.5',
                background: 'rgba(255,255,255,0.05)',
                border: '2px dashed #fbbf24',
                borderRadius: '12px',
                display: 'flex',
                flexDirection: 'column',
                alignItems: 'center',
                justifyContent: 'center',
                cursor: 'pointer',
                color: '#fbbf24',
                fontSize: '12px',
                transition: 'all 0.2s'
              }}
            >
              <div style={{ fontSize: '48px', marginBottom: '8px' }}>📷</div>
              <div style={{ fontWeight: 'bold', marginBottom: '4px' }}>点击上传图片</div>
              <div style={{ fontSize: '11px', color: '#94a3b8' }}>
                最多可上传 1 张
              </div>
            </div>
          )}
        </div>

        {/* 基本信息 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ color: '#fbbf24', fontSize: '13px', fontWeight: 'bold', marginBottom: '12px' }}>基本信息</div>
          <div style={{ display: 'flex', flexWrap: 'wrap', gap: '12px' }}>
            <Input form={form} handleChange={handleChange} label="名称 *" field="name" />
            <Input form={form} handleChange={handleChange} label="持仓类型" field="category" options={categoryOptions} />
            <Input form={form} handleChange={handleChange} label="珍惜度" field="rarity" options={rarityOptions} />
            <Input form={form} handleChange={handleChange} label="冠字序号" field="prefixSerial" />
            <Input form={form} handleChange={handleChange} label="版别" field="version" />
            <Input form={form} handleChange={handleChange} label="面值" field="denomination" />
            <Input form={form} handleChange={handleChange} label="状态" field="status" options={statusOptions} />
            <Input form={form} handleChange={handleChange} label="包装" field="packaging" options={packagingOptions} />
          </div>
          <div style={{ marginTop: '12px', paddingTop: '12px', borderTop: '1px solid rgba(255,255,255,0.05)' }}>
            <div style={{ display: 'flex', gap: '24px', flexWrap: 'wrap' }}>
              <div style={{ flex: 1, minWidth: '45%' }}>
                <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>编号</div>
                <div style={{ background: 'rgba(255,255,255,0.03)', border: '1px solid rgba(255,255,255,0.05)', color: '#fbbf24', padding: '8px', borderRadius: '6px', fontSize: '13px', fontFamily: 'monospace', fontWeight: 'bold' }}>
                  {form.code || '（保存后自动生成）'}
                </div>
              </div>
              <div style={{ flex: 1, minWidth: '45%' }}>
                <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>创建时间</div>
                <div style={{ background: 'rgba(255,255,255,0.03)', border: '1px solid rgba(255,255,255,0.05)', color: '#94a3b8', padding: '8px', borderRadius: '6px', fontSize: '13px' }}>
                  {form.createdAt ? new Date(form.createdAt).toLocaleDateString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit' }).replace(/\//g, '-') : '（保存后自动生成）'}
                </div>
              </div>
            </div>
          </div>
        </div>

        {/* 评级信息 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ color: '#fbbf24', fontSize: '13px', fontWeight: 'bold', marginBottom: '12px' }}>评级信息</div>
          <div style={{ marginBottom: '12px', display: 'flex', alignItems: 'center', gap: '10px' }}>
            <input 
              type="checkbox" 
              id="isGraded"
              checked={form.isGraded || false} 
              onChange={(e) => handleChange('isGraded', e.target.checked)} 
              style={{ width: '22px', height: '22px', cursor: 'pointer', backgroundColor: form.isGraded ? '#22c55e' : 'rgba(255,255,255,0.1)', border: '2px solid #22c55e', borderRadius: '4px', appearance: 'none', WebkitAppearance: 'none' }} 
            />
            <label htmlFor="isGraded" style={{ color: '#fff', cursor: 'pointer', fontSize: '15px' }}>是否评级</label>
          </div>
          <Input form={form} handleChange={handleChange} label="评级公司" field="gradingCompany" />
          <Input form={form} handleChange={handleChange} label="评级分数" field="gradingScore" />
          <Input form={form} handleChange={handleChange} label="特殊标识" field="specialMark" />
          <div style={{ marginBottom: '12px', display: 'flex', alignItems: 'center', gap: '10px' }}>
            <input 
              type="checkbox" 
              id="threeStar"
              checked={form.threeStar || false} 
              onChange={(e) => handleChange('threeStar', e.target.checked)} 
              style={{ width: '22px', height: '22px', cursor: 'pointer', backgroundColor: form.threeStar ? '#22c55e' : 'rgba(255,255,255,0.1)', border: '2px solid #22c55e', borderRadius: '4px', appearance: 'none', WebkitAppearance: 'none' }} 
            />
            <label htmlFor="threeStar" style={{ color: '#fff', cursor: 'pointer', fontSize: '15px' }}>三星</label>
          </div>
        </div>

        {/* 特殊信息 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ color: '#fbbf24', fontSize: '13px', fontWeight: 'bold', marginBottom: '12px' }}>特殊信息</div>
          <div style={{ display: 'flex', flexWrap: 'wrap', gap: '12px' }}>
            <Input form={form} handleChange={handleChange} label="号码特征" field="serialFeature" />
            <Input form={form} handleChange={handleChange} label="发行方" field="issuer" />
            <Input form={form} handleChange={handleChange} label="发行年份" field="issueYear" />
            <Input form={form} handleChange={handleChange} label="材质" field="material" />
            <Input form={form} handleChange={handleChange} label="发行量" field="issueQuantity" />
          </div>
        </div>

        {/* 价格信息 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ color: '#fbbf24', fontSize: '13px', fontWeight: 'bold', marginBottom: '12px' }}>价格信息</div>
          <Input form={form} handleChange={handleChange} label="成本价" field="costPrice" type="number" />
          <Input form={form} handleChange={handleChange} label="目标价" field="targetPrice" type="number" />
          <Input form={form} handleChange={handleChange} label="出售价" field="goalPrice" type="number" />
          <Input form={form} handleChange={handleChange} label="修复费" field="repairFee" type="number" />
          <Input form={form} handleChange={handleChange} label="评级费" field="gradingFee" type="number" />
          <Input form={form} handleChange={handleChange} label="用途" field="purpose" />
        </div>

        {/* 备注 */}
        <div style={{ background: 'rgba(255,255,255,0.03)', borderRadius: '12px', padding: '16px', marginBottom: '12px' }}>
          <div style={{ fontSize: '12px', color: '#94a3b8', marginBottom: '4px' }}>备注</div>
          <textarea 
            value={form.remark || ''}
            onChange={(e) => handleChange('remark', e.target.value)}
            rows={3}
            style={{ background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', color: '#fff', padding: '8px', borderRadius: '8px', width: '100%', resize: 'none' }}
          />
        </div>

        {/* 按钮 */}
        <button onClick={saving ? null : handleSave} disabled={saving} style={{ width: '100%', padding: '14px', background: saving ? '#64748b' : '#fbbf24', color: '#1e293b', border: 'none', borderRadius: '10px', fontSize: '16px', fontWeight: '600', marginBottom: '12px', cursor: saving ? 'not-allowed' : 'pointer' }}>
          {saving ? '保存中...' : '保存'}
        </button>

        <button onClick={handleDelete} style={{ width: '100%', padding: '14px', background: 'rgba(239,68,68,0.1)', color: '#ef4444', border: '1px solid #ef4444', borderRadius: '10px', fontSize: '16px', cursor: 'pointer' }}>
          删除藏品
        </button>
      </div>

      {/* 删除确认弹窗 */}
      {showDelete && (
        <div style={{ position: 'fixed', top: 0, left: 0, right: 0, bottom: 0, background: 'rgba(0,0,0,0.8)', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: 1000 }}>
          <div style={{ background: '#1e293b', borderRadius: '12px', padding: '24px', width: '80%', maxWidth: '300px' }}>
            <div style={{ color: '#fff', fontSize: '16px', fontWeight: 'bold', marginBottom: '16px', textAlign: 'center' }}>确定删除此藏品？</div>
            <div style={{ display: 'flex', gap: '12px' }}>
              <button onClick={() => setShowDelete(false)} style={{ flex: 1, padding: '12px', background: 'rgba(255,255,255,0.1)', color: '#fff', border: 'none', borderRadius: '8px', fontSize: '13px' }}>取消</button>
              <button onClick={doDelete} style={{ flex: 1, padding: '12px', background: '#ef4444', color: '#fff', border: 'none', borderRadius: '8px', fontSize: '13px' }}>删除</button>
            </div>
          </div>
        </div>
      )}
    </div>
  )
}