import { useEffect, useState } from 'react'
import { Card, Table, Typography, Space, Select, Tag, message } from 'antd'
import { listRules, listSites, updateRuleStatus, type Rule, type Site } from '../api'

const MODE_LABELS: Record<string, string> = {
  two_party_distributor_receive: '两方-分销收号',
  two_party_platform_receive: '两方-分销卖出',
  three_party: '三方',
}

export default function Rules() {
  const [sites, setSites] = useState<Site[]>([])
  const [siteID, setSiteID] = useState<number | undefined>(undefined)
  const [rules, setRules] = useState<Rule[]>([])
  const [loading, setLoading] = useState(false)

  async function load(site?: number) {
    setLoading(true)
    try {
      setRules(await listRules(site))
    } catch {
      message.error('规则加载失败')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    listSites()
      .then((rows) => {
        setSites(rows)
        if (rows.length === 1) {
          setSiteID(rows[0].id)
          void load(rows[0].id)
        } else {
          void load(undefined)
        }
      })
      .catch(() => message.error('站点加载失败'))
  }, [])

  async function toggleStatus(rule: Rule) {
    const next = rule.status === 'active' ? 'disabled' : 'active'
    try {
      await updateRuleStatus(rule.id, next)
      message.success(`规则已${next === 'active' ? '启用' : '停用'}`)
      void load(siteID)
    } catch {
      message.error('状态更新失败')
    }
  }

  return (
    <Space direction="vertical" className="page">
      <Typography.Title level={3}>比例与税费规则</Typography.Title>
      <Space>
        <Select
          allowClear
          placeholder="分销网站"
          style={{ width: 200 }}
          value={siteID}
          options={sites.map((site) => ({ label: site.site_name, value: site.id }))}
          onChange={(value) => {
            setSiteID(value)
            void load(value)
          }}
        />
      </Space>
      <Card>
        <Table
          rowKey="id"
          loading={loading}
          dataSource={rules}
          pagination={false}
          columns={[
            { title: '模式', dataIndex: 'mode', render: (v: string) => MODE_LABELS[v] ?? v },
            { title: '版本', dataIndex: 'version' },
            { title: '状态', dataIndex: 'status', render: (v: string) => <Tag color={v === 'active' ? 'green' : 'default'}>{v}</Tag> },
            {
              title: '比例',
              render: (_: unknown, r: Rule) => {
                const parts: string[] = []
                if (r.distributor_receive_ratio > 0) parts.push(`分销收 ${r.distributor_receive_ratio}`)
                if (r.platform_sell_ratio > 0) parts.push(`主站卖 ${r.platform_sell_ratio}`)
                if (r.distributor_sell_ratio > 0) parts.push(`分销卖 ${r.distributor_sell_ratio}`)
                if (r.platform_receive_ratio > 0) parts.push(`主站收 ${r.platform_receive_ratio}`)
                if (r.distributor_a_ratio > 0) parts.push(`分销A ${r.distributor_a_ratio}`)
                if (r.distributor_b_ratio > 0) parts.push(`分销B ${r.distributor_b_ratio}`)
                return parts.join(' / ') || '-'
              },
            },
            { title: '服务费', render: (_: unknown, r: Rule) => `${r.service_fee_value} (${r.service_fee_unit})` },
            { title: '手续费', dataIndex: 'payment_fee_bps', render: (v: number) => `${v / 100}%` },
            { title: '税费', render: (_: unknown, r: Rule) => (r.tax_enabled ? `${r.tax_rate_bps / 100}%` : '关闭') },
            { title: '生效时间', dataIndex: 'effective_from' },
            {
              title: '操作',
              render: (_: unknown, r: Rule) => (
                <a onClick={() => toggleStatus(r)}>{r.status === 'active' ? '停用' : '启用'}</a>
              ),
            },
          ]}
        />
      </Card>
    </Space>
  )
}