import { useCallback, useEffect, useState } from 'react';
import {
  Button, Checkbox, Drawer, Form, Input, Modal, Popconfirm, Select, Space, Table, Tabs, Tag, Typography, message,
} from 'antd';
import type { ColumnsType } from 'antd/es/table';
import { PARTNER_PERMISSION_KEYS, PARTNER_PERMISSION_LABELS, PARTNER_STAFF_ROLE_LABELS, type PartnerPermissionKey } from '@dukang/shared-types';
import { request, type Paginated } from '../lib/api';
import { AdminCellLine } from '../components/AdminCellLine';
import { ACCOUNT_STATUS_LABELS, ADMIN_OPTIONS_PAGE_SIZE, ORDER_STATUS_LABELS, PARTNER_BILL_STATUS_LABELS, fmtTime } from '../lib/constants';

type PartnerOption = { id: string; companyName: string };
type ParentAccount = { id: string; name: string; phone: string };

type AccountTreeRow = {
  id: string;
  phone: string;
  name: string;
  status: string;
  isPrimary: number;
  staffRole?: string | null;
  permissions?: string[] | null;
  parentAccountId?: string | null;
  parent?: ParentAccount | null;
  createdAt: string;
  lastLoginAt?: string | null;
  companyName?: string | null;
  children?: AccountTreeRow[];
};

type BillRow = {
  id: string; billNo: string; totalAmount: number; orderCommission: number; redeemCommission: number;
  status: string; periodStart: string; periodEnd: string; createdAt: string;
};

type OrderRow = {
  id: string; orderNo: string; status: string; payAmount: number; createdAt: string;
  user?: { userNo: string; phone: string | null };
};

type Detail = AccountTreeRow & { bills?: BillRow[]; orders?: OrderRow[] };

const STAFF_ROLE_OPTIONS = Object.entries(PARTNER_STAFF_ROLE_LABELS).map(([value, label]) => ({
  value,
  label,
}));

const PERMISSION_OPTIONS = PARTNER_PERMISSION_KEYS.map((key: PartnerPermissionKey) => ({
  value: key,
  label: PARTNER_PERMISSION_LABELS[key],
}));

function filterTree(rows: AccountTreeRow[], phone?: string, status?: string): AccountTreeRow[] {
  const phoneQ = phone?.trim();
  const match = (row: AccountTreeRow) => {
    const phoneOk = !phoneQ || row.phone.includes(phoneQ);
    const statusOk = !status || row.status === status;
    return phoneOk && statusOk;
  };

  const walk = (list: AccountTreeRow[]): AccountTreeRow[] => {
    const result: AccountTreeRow[] = [];
    for (const row of list) {
      const children = row.children?.length ? walk(row.children) : undefined;
      if (match(row) || (children && children.length > 0)) {
        result.push({ ...row, children: children?.length ? children : undefined });
      }
    }
    return result;
  };

  return walk(rows);
}

function staffRoleLabel(role?: string | null) {
  if (!role) return '-';
  return PARTNER_STAFF_ROLE_LABELS[role as keyof typeof PARTNER_STAFF_ROLE_LABELS] ?? role;
}

export default function PartnerAccountsPage() {
  const [form] = Form.useForm();
  const [editForm] = Form.useForm();
  const [subForm] = Form.useForm();
  const [filters, setFilters] = useState<{ phone?: string; status?: string; partnerId?: string }>({});
  const [treeData, setTreeData] = useState<AccountTreeRow[]>([]);
  const [loading, setLoading] = useState(false);
  const [expandedRowKeys, setExpandedRowKeys] = useState<string[]>([]);
  const [detail, setDetail] = useState<Detail | null>(null);
  const [drawerOpen, setDrawerOpen] = useState(false);
  const [subOpen, setSubOpen] = useState(false);
  const [subParent, setSubParent] = useState<AccountTreeRow | null>(null);
  const [partners, setPartners] = useState<PartnerOption[]>([]);

  const loadTree = useCallback(async () => {
    setLoading(true);
    try {
      const qs = new URLSearchParams();
      if (filters.partnerId) qs.set('partnerId', filters.partnerId);
      const path = qs.toString() ? `/admin/partner-accounts/tree?${qs}` : '/admin/partner-accounts/tree';
      const res = await request<AccountTreeRow[]>(path);
      setTreeData(filterTree(res, filters.phone, filters.status));
    } finally {
      setLoading(false);
    }
  }, [filters]);

  useEffect(() => {
    void loadPartners();
  }, []);

  useEffect(() => {
    void loadTree();
  }, [loadTree]);

  useEffect(() => {
    if (!drawerOpen || !detail) return;
    editForm.setFieldsValue({
      name: detail.name,
      phone: detail.phone,
      status: detail.status,
      permissions: detail.permissions ?? [],
    });
  }, [drawerOpen, detail, editForm]);

  async function loadPartners() {
    const res = await request<Paginated<PartnerOption>>(`/admin/partners?pageSize=${ADMIN_OPTIONS_PAGE_SIZE}`);
    setPartners(res.items);
  }

  async function openAccount(id: string) {
    try {
      const d = await request<Detail>(`/admin/partner-accounts/${id}`);
      setDetail(d);
      setDrawerOpen(true);
    } catch (e) {
      message.error(e instanceof Error ? e.message : '加载账户详情失败');
    }
  }

  async function saveAccount() {
    if (!detail) return;
    const v = await editForm.validateFields();
    await request(`/admin/partner-accounts/${detail.id}`, { method: 'PUT', body: JSON.stringify(v) });
    message.success('已保存');
    setDrawerOpen(false);
    void loadTree();
  }

  async function deleteSubAccount(row: AccountTreeRow) {
    await request(`/admin/partner-accounts/${row.id}`, { method: 'DELETE' });
    message.success('子账号已删除');
    void loadTree();
  }

  function openAddSub(parent: AccountTreeRow) {
    setSubParent(parent);
    subForm.resetFields();
    subForm.setFieldsValue({ staffRole: 'INTERNAL', permissions: ['store:create', 'store:manage'] });
    setSubOpen(true);
  }

  function collectExpandableKeys(rows: AccountTreeRow[]): string[] {
    const keys: string[] = [];
    for (const row of rows) {
      if (row.children?.length) {
        keys.push(row.id);
        keys.push(...collectExpandableKeys(row.children));
      }
    }
    return keys;
  }

  const columns: ColumnsType<AccountTreeRow> = [
    {
      title: '姓名 / 类型',
      width: 200,
      ellipsis: true,
      render: (_, row) => (
        <AdminCellLine
          primary={row.name}
          secondary={
            row.parentAccountId
              ? `子账号 · ${staffRoleLabel(row.staffRole)}`
              : '主账号'
          }
        />
      ),
    },
    { title: '手机', dataIndex: 'phone', width: 120 },
    {
      title: '开城合伙人',
      width: 140,
      ellipsis: true,
      render: (_, row) => row.companyName || row.parent?.name || '—',
    },
    {
      title: '账号类型',
      width: 90,
      render: (_, row) => (
        <Tag color={row.parentAccountId ? 'default' : 'blue'}>
          {row.parentAccountId ? '子账号' : '主账号'}
        </Tag>
      ),
    },
    {
      title: '角色',
      dataIndex: 'staffRole',
      width: 100,
      render: (role) => staffRoleLabel(role),
    },
    {
      title: '所属主账号',
      width: 140,
      render: (_, row) => (
        row.parentAccountId && row.parent
          ? `${row.parent.name} / ${row.parent.phone}`
          : '-'
      ),
    },
    { title: '状态', dataIndex: 'status', width: 80, render: (s) => <Tag>{ACCOUNT_STATUS_LABELS[s] || s}</Tag> },
    { title: '创建', dataIndex: 'createdAt', width: 160, render: fmtTime },
    {
      title: '操作',
      width: 180,
      render: (_, row) => (
        <Space size={0} wrap onClick={(e) => e.stopPropagation()}>
          <Button type="link" size="small" onClick={() => void openAccount(row.id)}>详情</Button>
          {!row.parentAccountId ? (
            <Button type="link" size="small" onClick={() => openAddSub(row)}>添加子账号</Button>
          ) : null}
          {row.parentAccountId ? (
            <Popconfirm title="确定删除该子账号？" onConfirm={() => void deleteSubAccount(row)}>
              <Button type="link" size="small" danger>删除</Button>
            </Popconfirm>
          ) : null}
        </Space>
      ),
    },
  ];

  const billColumns: ColumnsType<BillRow> = [
    { title: '账单号', dataIndex: 'billNo', width: 140 },
    { title: '总额', dataIndex: 'totalAmount', width: 90, render: (v) => `¥${v}` },
    { title: '订单佣金', dataIndex: 'orderCommission', width: 90, render: (v) => `¥${v}` },
    { title: '核销佣金', dataIndex: 'redeemCommission', width: 90, render: (v) => `¥${v}` },
    { title: '状态', dataIndex: 'status', width: 90, render: (s) => <Tag>{PARTNER_BILL_STATUS_LABELS[s] || s}</Tag> },
    { title: '周期', width: 200, render: (_, r) => `${fmtTime(r.periodStart)} ~ ${fmtTime(r.periodEnd)}` },
  ];

  const orderColumns: ColumnsType<OrderRow> = [
    { title: '订单号', dataIndex: 'orderNo', width: 160 },
    { title: '用户', dataIndex: ['user', 'userNo'], width: 110 },
    { title: '金额', dataIndex: 'payAmount', width: 90, render: (v) => `¥${v}` },
    { title: '状态', dataIndex: 'status', width: 90, render: (s) => <Tag>{ORDER_STATUS_LABELS[s] || s}</Tag> },
    { title: '下单', dataIndex: 'createdAt', width: 160, render: fmtTime },
  ];

  return (
    <div>
      <Space style={{ marginBottom: 16, width: '100%', justifyContent: 'space-between' }}>
        <div>
          <Typography.Title level={4} style={{ margin: 0 }}>合伙人子账号</Typography.Title>
          <Typography.Text type="secondary">
            主账号在「开城合伙人」创建；此处仅管理子账号树与权限
          </Typography.Text>
        </div>
      </Space>
      <Form
        form={form}
        layout="inline"
        style={{ marginBottom: 16 }}
        onFinish={(v) => {
          setFilters({
            phone: v.phone?.trim() || undefined,
            status: v.status || undefined,
            partnerId: v.partnerId || undefined,
          });
        }}
      >
        <Form.Item name="partnerId" label="开城合伙人">
          <Select
            allowClear
            showSearch
            optionFilterProp="label"
            style={{ width: 180 }}
            placeholder="全部"
            options={partners.map((p) => ({ value: p.id, label: p.companyName }))}
            onFocus={() => void loadPartners()}
          />
        </Form.Item>
        <Form.Item name="phone" label="手机"><Input allowClear /></Form.Item>
        <Form.Item name="status" label="状态">
          <Select allowClear style={{ width: 100 }} options={Object.entries(ACCOUNT_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
        </Form.Item>
        <Form.Item>
          <Space>
            <Button type="primary" htmlType="submit">查询</Button>
            <Button onClick={() => setExpandedRowKeys(collectExpandableKeys(treeData))}>全部展开</Button>
            <Button onClick={() => setExpandedRowKeys([])}>全部收起</Button>
          </Space>
        </Form.Item>
      </Form>
      <Table<AccountTreeRow>
        rowKey="id"
        className="admin-table-nowrap"
        loading={loading}
        columns={columns}
        dataSource={treeData}
        scroll={{ x: 1200 }}
        pagination={false}
        expandable={{
          expandedRowKeys,
          onExpandedRowsChange: (keys) => setExpandedRowKeys(keys as string[]),
          defaultExpandAllRows: false,
        }}
      />
      <Drawer
        title={detail?.parentAccountId ? '子账号详情' : '主账号详情（只读）'}
        width={720}
        open={drawerOpen}
        onClose={() => {
          setDrawerOpen(false);
          setDetail(null);
        }}
        destroyOnClose
        extra={
          detail?.parentAccountId
            ? <Button type="primary" onClick={() => void saveAccount()}>保存</Button>
            : null
        }
      >
        {detail && (
          <Tabs items={[
            {
              key: 'info',
              label: '基本信息',
              children: (
                <Form
                  form={editForm}
                  layout="vertical"
                  key={detail.id}
                  initialValues={{
                    name: detail.name,
                    phone: detail.phone,
                    status: detail.status,
                    permissions: detail.permissions ?? [],
                  }}
                >
                  <Form.Item label="开城合伙人">
                    <Input value={detail.companyName || detail.parent?.name || '—'} disabled />
                  </Form.Item>
                  <Form.Item label="账号类型">
                    <Input
                      value={
                        detail.parentAccountId
                          ? `子账号 · ${staffRoleLabel(detail.staffRole)}`
                          : '主账号'
                      }
                      disabled
                    />
                  </Form.Item>
                  {detail.parentAccountId && detail.parent ? (
                    <Form.Item label="所属主账号">
                      <Input value={`${detail.parent.name} / ${detail.parent.phone}`} disabled />
                    </Form.Item>
                  ) : null}
                  <Form.Item name="name" label="姓名" rules={[{ required: true }]}><Input disabled={!detail.parentAccountId} /></Form.Item>
                  <Form.Item
                    name="phone"
                    label="登录手机"
                    rules={[
                      { required: true },
                      { pattern: /^1[3-9]\d{9}$/, message: '请输入正确的手机号码' },
                    ]}
                  >
                    <Input maxLength={11} disabled={!detail.parentAccountId} />
                  </Form.Item>
                  <Form.Item name="status" label="状态" rules={[{ required: true }]}>
                    <Select disabled={!detail.parentAccountId} options={Object.entries(ACCOUNT_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
                  </Form.Item>
                  {detail.parentAccountId ? (
                    <Form.Item name="permissions" label="权限">
                      <Checkbox.Group options={PERMISSION_OPTIONS} />
                    </Form.Item>
                  ) : null}
                  {!detail.parentAccountId ? (
                    <Typography.Text type="secondary">
                      主账号请在「开城合伙人」页面编辑。
                    </Typography.Text>
                  ) : (
                    <Typography.Text type="secondary">
                      合伙人 H5 登录使用「登录手机」，与主账号联系电话可不同。
                    </Typography.Text>
                  )}
                </Form>
              ),
            },
            {
              key: 'bills',
              label: `账单 (${detail.bills?.length ?? 0})`,
              children: (
                <Table rowKey="id" className="admin-table-nowrap" size="small" columns={billColumns}
                  dataSource={detail.bills ?? []} pagination={false} scroll={{ x: 700 }} />
              ),
            },
            {
              key: 'orders',
              label: `名下订单 (${detail.orders?.length ?? 0})`,
              children: (
                <Table rowKey="id" className="admin-table-nowrap" size="small" columns={orderColumns}
                  dataSource={detail.orders ?? []} pagination={false} scroll={{ x: 650 }} />
              ),
            },
          ]} />
        )}
      </Drawer>
      <Modal
        title={subParent ? `添加子账号 · ${subParent.name}` : '添加子账号'}
        open={subOpen}
        onCancel={() => setSubOpen(false)}
        onOk={async () => {
          if (!subParent) return;
          const v = await subForm.validateFields();
          await request('/admin/partner-accounts', {
            method: 'POST',
            body: JSON.stringify({
              parentAccountId: subParent.id,
              name: v.name,
              phone: v.phone,
              staffRole: v.staffRole,
              permissions: v.permissions,
            }),
          });
          message.success('子账号已创建');
          setSubOpen(false);
          setExpandedRowKeys((keys) => [...new Set([...keys, subParent.id])]);
          void loadTree();
        }}
      >
        <Form form={subForm} layout="vertical">
          <Form.Item name="name" label="姓名" rules={[{ required: true }]}><Input /></Form.Item>
          <Form.Item
            name="phone"
            label="登录手机"
            rules={[
              { required: true },
              { pattern: /^1[3-9]\d{9}$/, message: '请输入正确的手机号码' },
            ]}
          >
            <Input maxLength={11} />
          </Form.Item>
          <Form.Item name="staffRole" label="角色" rules={[{ required: true }]}>
            <Select options={STAFF_ROLE_OPTIONS.filter((o) => o.value !== 'PARTNER')} />
          </Form.Item>
          <Form.Item name="permissions" label="权限">
            <Checkbox.Group options={PERMISSION_OPTIONS} />
          </Form.Item>
        </Form>
      </Modal>
    </div>
  );
}