import { useEffect, useState } from 'react'
import { useNavigate } from 'react-router-dom'
import { Card, Table, Button, Space, Tag, Popconfirm, message, Input, Modal, Form, Radio, InputNumber, Switch, Row, Col, Divider, Spin } from 'antd'
import { PlusOutlined, EditOutlined, DeleteOutlined, CopyOutlined } from '@ant-design/icons'
import { apiService } from '../services/api'
import type { CopyTradingTemplate } from '../types'
import { useMediaQuery } from 'react-responsive'
import { formatUSDC } from '../utils'

const { Search } = Input

const TemplateList: React.FC = () => {
  const navigate = useNavigate()
  const isMobile = useMediaQuery({ maxWidth: 768 })
  const [templates, setTemplates] = useState<CopyTradingTemplate[]>([])
  const [loading, setLoading] = useState(false)
  const [searchText, setSearchText] = useState('')
  const [copyModalVisible, setCopyModalVisible] = useState(false)
  const [copyForm] = Form.useForm()
  const [copyLoading, setCopyLoading] = useState(false)
  const [copyMode, setCopyMode] = useState<'RATIO' | 'FIXED'>('RATIO')
  const [sourceTemplate, setSourceTemplate] = useState<CopyTradingTemplate | null>(null)
  
  useEffect(() => {
    fetchTemplates()
  }, [])
  
  const fetchTemplates = async () => {
    setLoading(true)
    try {
      const response = await apiService.templates.list()
      if (response.data.code === 0 && response.data.data) {
        setTemplates(response.data.data.list || [])
      } else {
        message.error(response.data.msg || '获取模板列表失败')
      }
    } catch (error: any) {
      message.error(error.message || '获取模板列表失败')
    } finally {
      setLoading(false)
    }
  }
  
  const handleDelete = async (templateId: number) => {
    try {
      const response = await apiService.templates.delete({ templateId })
      if (response.data.code === 0) {
        message.success('删除模板成功')
        fetchTemplates()
      } else {
        message.error(response.data.msg || '删除模板失败')
      }
    } catch (error: any) {
      message.error(error.message || '删除模板失败')
    }
  }
  
  const handleCopy = (template: CopyTradingTemplate) => {
    setSourceTemplate(template)
    setCopyMode(template.copyMode)
    
    // 填充表单数据
    copyForm.setFieldsValue({
      templateName: `${template.templateName}-副本`,
      copyMode: template.copyMode,
      copyRatio: template.copyRatio ? parseFloat(template.copyRatio) * 100 : 100,
      fixedAmount: template.fixedAmount ? parseFloat(template.fixedAmount) : undefined,
      maxOrderSize: template.maxOrderSize ? parseFloat(template.maxOrderSize) : undefined,
      minOrderSize: template.minOrderSize ? parseFloat(template.minOrderSize) : undefined,
      maxDailyOrders: template.maxDailyOrders,
      priceTolerance: parseFloat(template.priceTolerance),
      supportSell: template.supportSell
    })
    
    setCopyModalVisible(true)
  }
  
  const handleCopySubmit = async (values: any) => {
    // 前端校验：如果填写了 minOrderSize，必须 >= 1
    if (values.copyMode === 'RATIO' && values.minOrderSize !== undefined && values.minOrderSize !== null && values.minOrderSize !== '' && Number(values.minOrderSize) < 1) {
      message.error('最小金额必须 >= 1')
      return
    }
    
    // 前端校验：固定金额模式下，fixedAmount 必填且必须 >= 1
    if (values.copyMode === 'FIXED') {
      const fixedAmount = values.fixedAmount
      if (fixedAmount === undefined || fixedAmount === null || fixedAmount === '') {
        message.error('请输入固定跟单金额')
        return
      }
      const amount = Number(fixedAmount)
      if (isNaN(amount)) {
        message.error('请输入有效的数字')
        return
      }
      if (amount < 1) {
        message.error('固定金额必须 >= 1，请重新输入')
        return
      }
    }
    
    setCopyLoading(true)
    try {
      const response = await apiService.templates.create({
        templateName: values.templateName,
        copyMode: values.copyMode || 'RATIO',
        // 将百分比转换为小数：100% -> 1.0
        copyRatio: values.copyMode === 'RATIO' && values.copyRatio ? (values.copyRatio / 100).toString() : undefined,
        fixedAmount: values.copyMode === 'FIXED' ? values.fixedAmount?.toString() : undefined,
        maxOrderSize: values.copyMode === 'RATIO' ? values.maxOrderSize?.toString() : undefined,
        minOrderSize: values.copyMode === 'RATIO' ? values.minOrderSize?.toString() : undefined,
        maxDailyOrders: values.maxDailyOrders,
        priceTolerance: values.priceTolerance?.toString(),
        supportSell: values.supportSell !== false
      })
      
      if (response.data.code === 0) {
        message.success('复制模板成功')
        setCopyModalVisible(false)
        copyForm.resetFields()
        fetchTemplates()
      } else {
        message.error(response.data.msg || '复制模板失败')
      }
    } catch (error: any) {
      message.error(error.message || '复制模板失败')
    } finally {
      setCopyLoading(false)
    }
  }
  
  const handleCopyCancel = () => {
    setCopyModalVisible(false)
    copyForm.resetFields()
    setSourceTemplate(null)
  }
  
  const filteredTemplates = templates.filter(template =>
    template.templateName.toLowerCase().includes(searchText.toLowerCase())
  )
  
  const columns = [
    {
      title: '模板名称',
      dataIndex: 'templateName',
      key: 'templateName',
      render: (text: string) => <strong>{text}</strong>
    },
    {
      title: '跟单模式',
      dataIndex: 'copyMode',
      key: 'copyMode',
      render: (mode: string) => (
        <Tag color={mode === 'RATIO' ? 'blue' : 'green'}>
          {mode === 'RATIO' ? '比例' : '固定金额'}
        </Tag>
      )
    },
    {
      title: '跟单配置',
      key: 'copyConfig',
      render: (_: any, record: CopyTradingTemplate) => {
        if (record.copyMode === 'RATIO') {
          return `比例 ${record.copyRatio}x`
        } else if (record.copyMode === 'FIXED' && record.fixedAmount) {
          return `固定 ${formatUSDC(record.fixedAmount)} USDC`
        }
        return '-'
      }
    },
    {
      title: '跟单卖出',
      dataIndex: 'supportSell',
      key: 'supportSell',
      render: (support: boolean) => (
        <Tag color={support ? 'green' : 'red'}>
          {support ? '是' : '否'}
        </Tag>
      )
    },
    {
      title: '使用次数',
      dataIndex: 'useCount',
      key: 'useCount',
      render: (count: number) => <Tag>{count}</Tag>
    },
    {
      title: '创建时间',
      dataIndex: 'createdAt',
      key: 'createdAt',
      render: (timestamp: number) => {
        const date = new Date(timestamp)
        return date.toLocaleString('zh-CN', {
          year: 'numeric',
          month: '2-digit',
          day: '2-digit',
          hour: '2-digit',
          minute: '2-digit',
          second: '2-digit'
        })
      },
      sorter: (a: CopyTradingTemplate, b: CopyTradingTemplate) => a.createdAt - b.createdAt,
      defaultSortOrder: 'descend' as const
    },
    {
      title: '操作',
      key: 'action',
      width: isMobile ? 120 : 200,
      render: (_: any, record: CopyTradingTemplate) => (
        <Space size="small">
          <Button
            type="link"
            size="small"
            icon={<EditOutlined />}
            onClick={() => navigate(`/templates/edit/${record.id}`)}
          >
            编辑
          </Button>
          <Button
            type="link"
            size="small"
            icon={<CopyOutlined />}
            onClick={() => handleCopy(record)}
          >
            复制
          </Button>
          <Popconfirm
            title="确定要删除这个模板吗？"
            description="删除后无法恢复，请确保没有跟单关系在使用该模板"
            onConfirm={() => handleDelete(record.id)}
            okText="确定"
            cancelText="取消"
          >
            <Button
              type="link"
              size="small"
              danger
              icon={<DeleteOutlined />}
            >
              删除
            </Button>
          </Popconfirm>
        </Space>
      )
    }
  ]
  
  return (
    <div>
      <Card>
        <div style={{ marginBottom: 16, display: 'flex', justifyContent: 'space-between', alignItems: 'center', flexWrap: 'wrap', gap: 16 }}>
          <h2 style={{ margin: 0 }}>跟单模板管理</h2>
          <Space>
            <Search
              placeholder="搜索模板名称"
              allowClear
              style={{ width: isMobile ? 150 : 250 }}
              onSearch={setSearchText}
              onChange={(e) => setSearchText(e.target.value)}
            />
            <Button
              type="primary"
              icon={<PlusOutlined />}
              onClick={() => navigate('/templates/add')}
            >
              新增模板
            </Button>
          </Space>
        </div>
        
        {isMobile ? (
          // 移动端卡片布局
          <div>
            {loading ? (
              <div style={{ textAlign: 'center', padding: '40px' }}>
                <Spin size="large" />
              </div>
            ) : filteredTemplates.length === 0 ? (
              <div style={{ textAlign: 'center', padding: '40px', color: '#999' }}>
                暂无模板数据
              </div>
            ) : (
              <div style={{ display: 'flex', flexDirection: 'column', gap: '12px' }}>
                {filteredTemplates.map((template) => {
                  const date = new Date(template.createdAt)
                  const formattedDate = date.toLocaleString('zh-CN', {
                    year: 'numeric',
                    month: '2-digit',
                    day: '2-digit',
                    hour: '2-digit',
                    minute: '2-digit'
                  })
                  
                  return (
                    <Card
                      key={template.id}
                      style={{
                        borderRadius: '12px',
                        boxShadow: '0 2px 8px rgba(0,0,0,0.08)',
                        border: '1px solid #e8e8e8'
                      }}
                      bodyStyle={{ padding: '16px' }}
                    >
                      {/* 模板名称和模式 */}
                      <div style={{ marginBottom: '12px' }}>
                        <div style={{ 
                          fontSize: '16px', 
                          fontWeight: 'bold', 
                          marginBottom: '8px',
                          color: '#1890ff'
                        }}>
                          {template.templateName}
                        </div>
                        <div style={{ display: 'flex', flexWrap: 'wrap', gap: '6px', alignItems: 'center' }}>
                          <Tag color={template.copyMode === 'RATIO' ? 'blue' : 'green'}>
                            {template.copyMode === 'RATIO' ? '比例模式' : '固定金额模式'}
                          </Tag>
                          <Tag color={template.supportSell ? 'green' : 'red'}>
                            {template.supportSell ? '跟单卖出' : '不跟单卖出'}
                          </Tag>
                          <Tag>{template.useCount} 次使用</Tag>
                        </div>
                      </div>
                      
                      <Divider style={{ margin: '12px 0' }} />
                      
                      {/* 跟单配置 */}
                      <div style={{ marginBottom: '12px' }}>
                        <div style={{ fontSize: '12px', color: '#666', marginBottom: '4px' }}>跟单配置</div>
                        <div style={{ fontSize: '14px', fontWeight: '500' }}>
                          {template.copyMode === 'RATIO' 
                            ? `比例 ${template.copyRatio}x`
                            : template.fixedAmount 
                              ? `固定 ${formatUSDC(template.fixedAmount)} USDC`
                              : '-'
                          }
                        </div>
                      </div>
                      
                      {/* 其他配置信息 */}
                      {template.copyMode === 'RATIO' && (
                        <div style={{ marginBottom: '12px' }}>
                          <div style={{ fontSize: '12px', color: '#666', marginBottom: '4px' }}>金额限制</div>
                          <div style={{ fontSize: '13px', color: '#333' }}>
                            {template.maxOrderSize && (
                              <span>最大: {formatUSDC(template.maxOrderSize)} USDC</span>
                            )}
                            {template.maxOrderSize && template.minOrderSize && <span> | </span>}
                            {template.minOrderSize && (
                              <span>最小: {formatUSDC(template.minOrderSize)} USDC</span>
                            )}
                            {!template.maxOrderSize && !template.minOrderSize && <span style={{ color: '#999' }}>未设置</span>}
                          </div>
                        </div>
                      )}
                      
                      <div style={{ marginBottom: '12px' }}>
                        <div style={{ fontSize: '12px', color: '#666', marginBottom: '4px' }}>其他配置</div>
                        <div style={{ fontSize: '13px', color: '#333' }}>
                          每日最大订单: {template.maxDailyOrders} | 价格容忍度: {template.priceTolerance}%
                        </div>
                      </div>
                      
                      {/* 创建时间 */}
                      <div style={{ marginBottom: '16px' }}>
                        <div style={{ fontSize: '12px', color: '#999' }}>
                          创建时间: {formattedDate}
                        </div>
                      </div>
                      
                      {/* 操作按钮 */}
                      <div style={{ display: 'flex', gap: '8px', flexWrap: 'wrap' }}>
                        <Button
                          type="primary"
                          size="small"
                          icon={<EditOutlined />}
                          onClick={() => navigate(`/templates/edit/${template.id}`)}
                          style={{ flex: 1, minWidth: '80px' }}
                        >
                          编辑
                        </Button>
                        <Button
                          size="small"
                          icon={<CopyOutlined />}
                          onClick={() => handleCopy(template)}
                          style={{ flex: 1, minWidth: '80px' }}
                        >
                          复制
                        </Button>
                        <Popconfirm
                          title="确定要删除这个模板吗？"
                          description="删除后无法恢复，请确保没有跟单关系在使用该模板"
                          onConfirm={() => handleDelete(template.id)}
                          okText="确定"
                          cancelText="取消"
                        >
                          <Button
                            danger
                            size="small"
                            icon={<DeleteOutlined />}
                            style={{ flex: 1, minWidth: '80px' }}
                          >
                            删除
                          </Button>
                        </Popconfirm>
                      </div>
                    </Card>
                  )
                })}
              </div>
            )}
          </div>
        ) : (
          // 桌面端表格布局
          <Table
            columns={columns}
            dataSource={filteredTemplates}
            rowKey="id"
            loading={loading}
            pagination={{
              pageSize: 20,
              showSizeChanger: true,
              showTotal: (total) => `共 ${total} 条`
            }}
          />
        )}
      </Card>
      
      <Modal
        title="复制模板"
        open={copyModalVisible}
        onCancel={handleCopyCancel}
        footer={null}
        width={isMobile ? '90%' : 800}
        destroyOnClose
      >
        <Form
          form={copyForm}
          layout="vertical"
          onFinish={handleCopySubmit}
        >
          <Form.Item
            label="模板名称"
            name="templateName"
            tooltip="模板的唯一标识名称，用于区分不同的跟单配置模板。模板名称必须唯一，不能与其他模板重名。"
            rules={[{ required: true, message: '请输入模板名称' }]}
          >
            <Input placeholder="请输入模板名称" />
          </Form.Item>
          
          <Form.Item
            label="跟单金额模式"
            name="copyMode"
            tooltip="选择跟单金额的计算方式。比例模式：跟单金额随 Leader 订单大小按比例变化；固定金额模式：无论 Leader 订单大小如何，跟单金额都固定不变。复制模板时，跟单模式保持原模板设置，不可修改。"
            rules={[{ required: true }]}
          >
            <Radio.Group disabled>
              <Radio value="RATIO">比例模式</Radio>
              <Radio value="FIXED">固定金额模式</Radio>
            </Radio.Group>
          </Form.Item>
          
          {copyMode === 'RATIO' && (
            <Form.Item
              label="跟单比例"
              name="copyRatio"
              tooltip="跟单比例表示跟单金额相对于 Leader 订单金额的百分比。例如：100% 表示 1:1 跟单，50% 表示半仓跟单，200% 表示双倍跟单"
            >
              <InputNumber
                min={10}
                max={1000}
                step={1}
                precision={0}
                style={{ width: '100%' }}
                addonAfter="%"
                placeholder="例如：100 表示 100%（1:1 跟单），默认 100%"
                parser={(value) => {
                  const parsed = parseFloat(value || '0')
                  if (parsed > 1000) return 1000
                  return parsed
                }}
                formatter={(value) => {
                  if (!value) return ''
                  const num = parseFloat(value.toString())
                  if (num > 1000) return '1000'
                  return value.toString()
                }}
              />
            </Form.Item>
          )}
          
          {copyMode === 'FIXED' && (
            <Form.Item
              label="固定跟单金额 (USDC)"
              name="fixedAmount"
              rules={[
                { required: true, message: '请输入固定跟单金额' },
                { 
                  validator: (_, value) => {
                    if (value !== undefined && value !== null && value !== '') {
                      const amount = Number(value)
                      if (isNaN(amount)) {
                        return Promise.reject(new Error('请输入有效的数字'))
                      }
                      if (amount < 1) {
                        return Promise.reject(new Error('固定金额必须 >= 1，请重新输入'))
                      }
                    }
                    return Promise.resolve()
                  }
                }
              ]}
            >
              <InputNumber
                step={0.0001}
                precision={4}
                style={{ width: '100%' }}
                placeholder="固定金额，不随 Leader 订单大小变化，必须 >= 1"
              />
            </Form.Item>
          )}
          
          {copyMode === 'RATIO' && (
            <>
              <Form.Item
                label="单笔订单最大金额 (USDC)"
                name="maxOrderSize"
                tooltip="比例模式下，限制单笔跟单订单的最大金额上限，用于防止跟单金额过大，控制风险。例如：设置为 1000，即使计算出的跟单金额超过 1000，也会限制为 1000 USDC。"
              >
                <InputNumber
                  min={0.01}
                  step={0.0001}
                  precision={4}
                  style={{ width: '100%' }}
                  placeholder="仅在比例模式下生效（可选）"
                />
              </Form.Item>
              
              <Form.Item
                label="单笔订单最小金额 (USDC)"
                name="minOrderSize"
                tooltip="比例模式下，限制单笔跟单订单的最小金额下限，用于过滤掉金额过小的订单，避免频繁小额交易。如果填写，必须 >= 1 USDC。例如：设置为 10，如果计算出的跟单金额小于 10，则跳过该订单。"
                rules={[
                  { 
                    validator: (_, value) => {
                      if (value === undefined || value === null || value === '') {
                        return Promise.resolve()
                      }
                      if (typeof value === 'number' && value < 1) {
                        return Promise.reject(new Error('最小金额必须 >= 1'))
                      }
                      return Promise.resolve()
                    }
                  }
                ]}
              >
                <InputNumber
                  min={1}
                  step={0.0001}
                  precision={4}
                  style={{ width: '100%' }}
                  placeholder="仅在比例模式下生效，必须 >= 1（可选）"
                />
              </Form.Item>
            </>
          )}
          
          <Form.Item
            label="每日最大跟单订单数"
            name="maxDailyOrders"
            tooltip="限制每日最多跟单的订单数量，用于风险控制，防止过度交易。例如：设置为 50，当日跟单订单数达到 50 后，停止跟单，次日重置。"
          >
            <InputNumber
              min={1}
              step={1}
              style={{ width: '100%' }}
              placeholder="默认 100（可选）"
            />
          </Form.Item>
          
          <Form.Item
            label="价格容忍度 (%)"
            name="priceTolerance"
            tooltip="允许跟单价格在 Leader 价格基础上的调整范围，用于在 Leader 价格 ± 容忍度范围内调整价格，提高成交率。例如：设置为 5%，Leader 价格为 0.5，则跟单价格可在 0.475-0.525 范围内。"
          >
            <InputNumber
              min={0}
              max={100}
              step={0.1}
              precision={2}
              style={{ width: '100%' }}
              placeholder="默认 5%（可选）"
            />
          </Form.Item>
          
          <Form.Item
            label="跟单卖出"
            name="supportSell"
            tooltip="是否跟单 Leader 的卖出订单。开启：跟单 Leader 的买入和卖出订单；关闭：只跟单 Leader 的买入订单，忽略卖出订单。"
            valuePropName="checked"
          >
            <Switch />
          </Form.Item>
          
          <Form.Item shouldUpdate>
            {({ getFieldsError }) => {
              const errors = getFieldsError()
              const hasErrors = errors.some(({ errors }) => errors && errors.length > 0)
              return (
                <Space style={{ width: '100%', justifyContent: 'flex-end' }}>
                  <Button onClick={handleCopyCancel}>
                    取消
                  </Button>
                  <Button
                    type="primary"
                    htmlType="submit"
                    loading={copyLoading}
                    disabled={hasErrors}
                  >
                    创建模板
                  </Button>
                </Space>
              )
            }}
          </Form.Item>
        </Form>
      </Modal>
    </div>
  )
}

export default TemplateList