import { useEffect, useState, useCallback } from 'react'
import { Card, Table, Typography, Space, Select, Tag, message, Row, Col, Divider, Alert, Button } from 'antd'
import {
  SafetyCertificateOutlined,
  DollarCircleOutlined,
  ThunderboltOutlined,
  CheckCircleOutlined,
  LockOutlined,
} from '@ant-design/icons'
import { listRules, listSites, updateRuleStatus, getMe, type Rule, type Site } from '../api'
import { useMember } from '../MemberContext'

const MODE_LABELS: Record<string, string> = {
  two_party_distributor_receive: '分销收号模式 (主站售出 / 散户在本站上传)',
  two_party_platform_receive: '分销卖号模式 (分站售出 / 主站共享号源池)',
  three_party: '分销跨站协同模式 (分站A收号 + 分站B卖出)',
  site_self_sell: '分站自收自卖模式',
}

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

  const load = useCallback(async (site?: number) => {
    setLoading(true)
    try {
      setRules(await listRules(site))
    } catch {
      message.error('分成规则加载失败')
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => {
    async function init() {
      let currentMember = member
      if (!currentMember) {
        try {
          currentMember = await getMe()
        } catch {
          // ignore
        }
      }
      const activeSiteID = currentMember?.site_id
      if (activeSiteID) {
        setSiteID(activeSiteID)
        void load(activeSiteID)
      }

      if (currentMember?.is_superadmin) {
        try {
          const rows = await listSites()
          setSites(rows)
          if (!activeSiteID) {
            void load(undefined)
          }
        } catch {
          // ignore
        }
      }
    }
    void init()
  }, [member, load])

  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')
    }
  }

  const isSuperadmin = member?.is_superadmin

  return (
    <Space direction="vertical" className="page" style={{ width: '100%' }} size="middle">
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
        <div>
          <Typography.Title level={3} style={{ marginBottom: 4 }}>
            {isSuperadmin ? '分成规则配置与管理' : '分销商合作协议与分成政策'}
          </Typography.Title>
          <Typography.Text type="secondary">
            {isSuperadmin
              ? '主站超管可维护各交易模式的分账比例、服务费与税费政策'
              : '查看当前分销站签约的收益权益、分成政策与资金结算恒等式说明'}
          </Typography.Text>
        </div>
        {isSuperadmin && sites.length > 1 && (
          <Select
            allowClear
            placeholder="切换分销网站"
            style={{ width: 220 }}
            value={siteID}
            options={sites.map((site) => ({ label: `${site.site_name} (${site.site_code})`, value: site.id }))}
            onChange={(value) => {
              setSiteID(value)
              void load(value)
            }}
          />
        )}
      </div>

      {/* 4 Core Rights Cards */}
      <Card title="分销商核心权益与收益构成">
        <Row gutter={[16, 16]}>
          <Col xs={24} md={6}>
            <div
              style={{
                background: '#f6ffed',
                border: '1px solid #b7eb8f',
                borderRadius: 8,
                padding: '16px',
                height: '100%',
              }}
            >
              <Space direction="vertical" style={{ width: '100%' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <ThunderboltOutlined style={{ color: '#52c41a', fontSize: 20 }} />
                  <Typography.Text strong style={{ fontSize: 16, color: '#389e0d' }}>
                    自主加价 100% 独享
                  </Typography.Text>
                </div>
                <Typography.Text type="secondary" style={{ fontSize: 13 }}>
                  分销站在主站基准价上自行上浮的全部溢价差额，<strong>100% 独立结算至商户账户</strong>，主站不参与任何分润抽成。
                </Typography.Text>
              </Space>
            </div>
          </Col>

          <Col xs={24} md={6}>
            <div
              style={{
                background: '#e6f4ff',
                border: '1px solid #91caff',
                borderRadius: 8,
                padding: '16px',
                height: '100%',
              }}
            >
              <Space direction="vertical" style={{ width: '100%' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <DollarCircleOutlined style={{ color: '#1677ff', fontSize: 20 }} />
                  <Typography.Text strong style={{ fontSize: 16, color: '#0958d9' }}>
                    卖号分成 40%
                  </Typography.Text>
                </div>
                <Typography.Text type="secondary" style={{ fontSize: 13 }}>
                  租客通过本分销站点租赁主站共享号源池账号，获得扣除号主底价后的<strong>主站提价利润池 40% 分成</strong>。
                </Typography.Text>
              </Space>
            </div>
          </Col>

          <Col xs={24} md={6}>
            <div
              style={{
                background: '#f9f0ff',
                border: '1px solid #d3adf7',
                borderRadius: 8,
                padding: '16px',
                height: '100%',
              }}
            >
              <Space direction="vertical" style={{ width: '100%' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <SafetyCertificateOutlined style={{ color: '#722ed1', fontSize: 20 }} />
                  <Typography.Text strong style={{ fontSize: 16, color: '#531dab' }}>
                    收号分成 35%
                  </Typography.Text>
                </div>
                <Typography.Text type="secondary" style={{ fontSize: 13 }}>
                  散户号主通过本站上传账号并上架，在全网产生租赁订单后，本站长期享受该账号产生的<strong>主站提价利润 35% 分成</strong>。
                </Typography.Text>
              </Space>
            </div>
          </Col>

          <Col xs={24} md={6}>
            <div
              style={{
                background: '#fffbe6',
                border: '1px solid #ffe58f',
                borderRadius: 8,
                padding: '16px',
                height: '100%',
              }}
            >
              <Space direction="vertical" style={{ width: '100%' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <CheckCircleOutlined style={{ color: '#fa8c16', fontSize: 20 }} />
                  <Typography.Text strong style={{ fontSize: 16, color: '#d46b08' }}>
                    底价与结算保障
                  </Typography.Text>
                </div>
                <Typography.Text type="secondary" style={{ fontSize: 13 }}>
                  号主本金 100% 刚兑保障。利润按收号 / 卖出 / 服务费切分，订单完成并过冷却期后系统自动释放入账至商户钱包。
                </Typography.Text>
              </Space>
            </div>
          </Col>
        </Row>
      </Card>

      {/* Rules Table */}
      <Card title="当前生效的交易分账规则版本">
        <Table
          rowKey="id"
          loading={loading}
          dataSource={rules}
          pagination={false}
          scroll={{ x: 950 }}
          columns={[
            {
              title: '业务交易模式',
              dataIndex: 'mode',
              width: 280,
              render: (v: string) => (
                <div>
                  <strong>{MODE_LABELS[v] ?? v}</strong>
                  <div style={{ fontSize: 11, color: '#8c8c8c' }}>模式标识: {v}</div>
                </div>
              ),
            },
            {
              title: '版本号',
              dataIndex: 'version',
              width: 90,
              render: (v: number) => <Tag color="blue">v{v}</Tag>,
            },
            {
              title: '状态',
              dataIndex: 'status',
              width: 100,
              render: (v: string) => (
                <Tag color={v === 'active' ? 'success' : 'default'}>
                  {v === 'active' ? '生效中' : '已停用'}
                </Tag>
              ),
            },
            {
              title: '分成权益比例',
              render: (_: unknown, r: Rule) => {
                const parts: string[] = []
                if (r.distributor_receive_ratio > 0) parts.push(`分销收号: ${r.distributor_receive_ratio}%`)
                if (r.distributor_sell_ratio > 0) parts.push(`分销卖出: ${r.distributor_sell_ratio}%`)
                if (r.platform_receive_ratio > 0) parts.push(`主站收号: ${r.platform_receive_ratio}%`)
                if (r.platform_sell_ratio > 0) parts.push(`主站卖出: ${r.platform_sell_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 (
                  <Space direction="vertical" size={2}>
                    {parts.map((p, idx) => (
                      <Tag color="cyan" key={idx}>
                        {p}
                      </Tag>
                    ))}
                  </Space>
                )
              },
            },
            {
              title: '平台服务费',
              width: 110,
              render: (_: unknown, r: Rule) => <span>{r.service_fee_value}%</span>,
            },
            {
              title: '生效时间',
              dataIndex: 'effective_from',
              width: 160,
              render: (v: string) => (
                <span style={{ fontSize: 12, color: '#595959' }}>
                  {v ? new Date(v).toLocaleString('zh-CN', { hour12: false }) : '-'}
                </span>
              ),
            },
            ...(isSuperadmin
              ? [
                  {
                    title: '操作',
                    width: 100,
                    render: (_: unknown, r: Rule) => (
                      <Button
                        type="link"
                        size="small"
                        danger={r.status === 'active'}
                        onClick={() => void toggleStatus(r)}
                      >
                        {r.status === 'active' ? '停用' : '启用'}
                      </Button>
                    ),
                  },
                ]
              : []),
          ]}
        />
      </Card>
    </Space>
  )
}