import { useState } from 'react';
import { Button, Field, Input, Select, Textarea } from '../components/ui.jsx';
import { Icon, PageTitle, Toolbar, Panel, ApiNotice, Modal, ConfirmDialog, SimpleTable, KeyValue } from '../components/layout.jsx';
import { gateways } from '../fixtures/devFixtures.js';
import { explainApiError } from '../api.js';

export function CustomersPage({ customerRows, setCustomerRows, addRechargeRecord, apiLoading, apiError, refreshApi, can = () => true, onCreateCustomer, onUpdateCustomer, onToggleCustomerStatus, onDeleteCustomer, onRechargeCustomer }) {
  const [showCreateCustomer, setShowCreateCustomer] = useState(false);
  const [editingCustomer, setEditingCustomer] = useState(null);
  const [rechargeCustomer, setRechargeCustomer] = useState(null);
  const [deleteCustomerTarget, setDeleteCustomerTarget] = useState(null);
  const [statusCustomerTarget, setStatusCustomerTarget] = useState(null);
  const [newCustomer, setNewCustomer] = useState({ name: '', contact: '', phone: '', email: '' });
  const [editCustomerForm, setEditCustomerForm] = useState({ name: '', contact: '', phone: '', email: '' });
  const [rechargeForm, setRechargeForm] = useState({ amount: '', remark: '' });
  const [actionError, setActionError] = useState('');
  const canManageCustomers = can('customers.manage');
  const canManageRecharges = can('recharges.manage');
  const openEditCustomer = (customer) => {
    setEditingCustomer(customer);
    setEditCustomerForm({
      name: customer.name || '',
      contact: customer.contact === '-' ? '' : customer.contact || '',
      phone: customer.phone === '-' ? '' : customer.phone || '',
      email: customer.email === '-' ? '' : customer.email || '',
    });
  };
  const closeEditCustomer = () => {
    setEditingCustomer(null);
    setEditCustomerForm({ name: '', contact: '', phone: '', email: '' });
  };
  const openRechargeCustomer = (customer) => {
    setRechargeCustomer(customer);
    setRechargeForm({ amount: '', remark: '' });
  };
  const closeRechargeCustomer = () => {
    setRechargeCustomer(null);
    setRechargeForm({ amount: '', remark: '' });
  };
  const parseMoney = (value) => Number(String(value).replace(/[^\d.-]/g, '')) || 0;
  const formatMoney = (value) => `¥${value.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
  const submitCustomer = async (event) => {
    event.preventDefault();
    if (!newCustomer.name.trim()) return;
    setActionError('');
    try {
      if (onCreateCustomer) {
        await onCreateCustomer({
          name: newCustomer.name.trim(),
          contactName: newCustomer.contact.trim() || undefined,
          phone: newCustomer.phone.trim() || undefined,
          email: newCustomer.email.trim() || undefined,
          billingMode: 'PREPAID',
          creditLimit: '0.000000',
          minBalance: '0.000000',
        });
      } else {
        const nextIndex = customerRows.length + 1;
        setCustomerRows([...customerRows, { id: `C${String(1000 + nextIndex)}`, name: newCustomer.name.trim(), contact: newCustomer.contact.trim() || '-', phone: newCustomer.phone.trim() || '-', email: newCustomer.email.trim() || '-', domain: '-', auth: '待配置', status: '启用', balance: '¥0.00', credit: '¥0', billing: '待配置', routeGroup: '待配置', gateways: 0, createdAt: '2026-06-18' }]);
      }
      setNewCustomer({ name: '', contact: '', phone: '', email: '' });
      setShowCreateCustomer(false);
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const submitEditCustomer = async (event) => {
    event.preventDefault();
    if (!editCustomerForm.name.trim() || !editingCustomer) return;
    setActionError('');
    try {
      if (onUpdateCustomer) {
        await onUpdateCustomer(editingCustomer.id, {
          name: editCustomerForm.name.trim(),
          contactName: editCustomerForm.contact.trim() || null,
          phone: editCustomerForm.phone.trim() || null,
          email: editCustomerForm.email.trim() || null,
        });
      } else {
        setCustomerRows(customerRows.map((customer) => (
          customer.id === editingCustomer.id ? { ...customer, name: editCustomerForm.name.trim(), contact: editCustomerForm.contact.trim() || '-', phone: editCustomerForm.phone.trim() || '-', email: editCustomerForm.email.trim() || '-' } : customer
        )));
      }
      closeEditCustomer();
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const submitRecharge = async (event) => {
    event.preventDefault();
    const amount = Number(rechargeForm.amount);
    if (!rechargeCustomer || !Number.isFinite(amount) || amount <= 0) return;
    setActionError('');
    try {
      if (onRechargeCustomer) {
        await onRechargeCustomer(rechargeCustomer.id, {
          amount: amount.toFixed(2),
          remark: rechargeForm.remark.trim() || undefined,
        });
      } else {
        const beforeBalance = parseMoney(rechargeCustomer.balance);
        const afterBalance = beforeBalance + amount;
        setCustomerRows(customerRows.map((customer) => (
          customer.id === rechargeCustomer.id ? { ...customer, balance: formatMoney(afterBalance) } : customer
        )));
        addRechargeRecord({ id: `RCG-${Date.now()}`, type: 'customer', owner: rechargeCustomer.name, amount: formatMoney(amount), beforeBalance: formatMoney(beforeBalance), afterBalance: formatMoney(afterBalance), remark: rechargeForm.remark.trim() || '-', operator: '运营管理员', time: new Date().toLocaleString('zh-CN', { hour12: false }), status: '成功' });
      }
      closeRechargeCustomer();
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const deleteCustomer = async (customer) => {
    setActionError('');
    try {
      if (onDeleteCustomer) {
        await onDeleteCustomer(customer.id);
      } else {
        if ((customer.gateways ?? 0) > 0) {
          throw new Error('该客户仍有关联客户网关，不能删除。');
        }
        setCustomerRows((rows) => rows.filter((item) => item.id !== customer.id));
      }
      setDeleteCustomerTarget(null);
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const toggleCustomerStatus = async (customer) => {
    setActionError('');
    try {
      if (onToggleCustomerStatus) {
        await onToggleCustomerStatus(customer);
      } else {
        setCustomerRows((rows) => rows.map((item) => (
          item.id === customer.id ? { ...item, status: item.status === '启用' ? '停用' : '启用' } : item
        )));
      }
      setStatusCustomerTarget(null);
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };

  return (
    <>
      <PageTitle
        title="客户管理"
        desc="客户开通、SIP 账号/IP 白名单、费率方案、线路组、余额授信和操作日志。"
        actions={canManageCustomers ? <Button icon={<Icon type="plus" />} onClick={() => setShowCreateCustomer(true)}>新增客户</Button> : null}
      />
      <ApiNotice loading={apiLoading} error={apiError || actionError} onRetry={refreshApi} />
      <Toolbar>
        <Field label="客户名称"><Input placeholder="搜索客户名称 / 域名" /></Field>
        <Field label="状态"><Select defaultValue="all"><option value="all">全部状态</option><option>启用</option><option>停用</option></Select></Field>
        <Button icon={<Icon type="search" />}>查询</Button>
      </Toolbar>
      <section className="master-detail">
        <Panel title="客户列表" className="main-list wide-panel">
          <SimpleTable
            rows={customerRows}
            columns={[
              { key: 'id', label: '客户 ID', width: '108px', className: 'table-cell-compact' },
              { key: 'name', label: '名称', width: '180px', className: 'table-cell-compact' },
              { key: 'balance', label: '余额' },
              { key: 'credit', label: '授信额度' },
              { key: 'status', label: '状态', status: true },
              { key: 'gateways', label: '客户网关数' },
              {
                key: 'actions',
                label: '操作',
                render: (row) => (
                  <div className="table-actions">
                    {canManageCustomers ? <Button size="sm" variant="outline" onClick={() => openEditCustomer(row)}>编辑</Button> : null}
                    {canManageRecharges ? <Button size="sm" variant="secondary" onClick={() => openRechargeCustomer(row)}>充值</Button> : null}
                    {canManageCustomers ? (
                      <Button size="sm" variant={row.status === '启用' ? 'ghost' : 'secondary'} onClick={() => setStatusCustomerTarget(row)}>
                        {row.status === '启用' ? '禁用' : '启用'}
                      </Button>
                    ) : null}
                    {canManageCustomers ? <Button size="sm" variant="danger" onClick={() => setDeleteCustomerTarget(row)}>删除</Button> : null}
                    {!canManageCustomers && !canManageRecharges ? '-' : null}
                  </div>
                ),
              },
            ]}
          />
        </Panel>
      </section>
      {showCreateCustomer ? (
        <Modal title="新增客户" onClose={() => setShowCreateCustomer(false)} size="sm">
          <form className="modal-form" onSubmit={submitCustomer}>
            <Field label={<span>客户名称 <span className="required-star">*</span></span>}>
              <Input value={newCustomer.name} onChange={(event) => setNewCustomer({ ...newCustomer, name: event.target.value })} placeholder="请输入企业名称" required />
            </Field>
            <Field label="联系人">
              <Input value={newCustomer.contact} onChange={(event) => setNewCustomer({ ...newCustomer, contact: event.target.value })} placeholder="请输入联系人" />
            </Field>
            <Field label="联系电话">
              <Input value={newCustomer.phone} onChange={(event) => setNewCustomer({ ...newCustomer, phone: event.target.value })} placeholder="请输入联系电话" />
            </Field>
            <Field label="邮箱">
              <Input type="email" value={newCustomer.email} onChange={(event) => setNewCustomer({ ...newCustomer, email: event.target.value })} placeholder="请输入邮箱" />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={() => setShowCreateCustomer(false)}>取消</Button>
              <Button type="submit">保存客户</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {rechargeCustomer ? (
        <Modal title={`${rechargeCustomer.name} 充值`} onClose={closeRechargeCustomer} size="sm">
          <form className="modal-form" onSubmit={submitRecharge}>
            <KeyValue label="当前余额" value={rechargeCustomer.balance} />
            <Field label={<span>充值金额 <span className="required-star">*</span></span>}>
              <Input type="number" min="0.01" step="0.01" value={rechargeForm.amount} onChange={(event) => setRechargeForm({ ...rechargeForm, amount: event.target.value })} placeholder="请输入充值金额" required />
            </Field>
            <Field label="备注">
              <Textarea rows="4" value={rechargeForm.remark} onChange={(event) => setRechargeForm({ ...rechargeForm, remark: event.target.value })} placeholder="请输入备注" />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={closeRechargeCustomer}>取消</Button>
              <Button type="submit">确认充值</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {editingCustomer ? (
        <Modal title="编辑客户" onClose={closeEditCustomer} size="sm">
          <form className="modal-form" onSubmit={submitEditCustomer}>
            <Field label={<span>客户名称 <span className="required-star">*</span></span>}>
              <Input value={editCustomerForm.name} onChange={(event) => setEditCustomerForm({ ...editCustomerForm, name: event.target.value })} placeholder="请输入客户名称" required />
            </Field>
            <Field label="联系人">
              <Input value={editCustomerForm.contact} onChange={(event) => setEditCustomerForm({ ...editCustomerForm, contact: event.target.value })} placeholder="请输入联系人" />
            </Field>
            <Field label="联系电话">
              <Input value={editCustomerForm.phone} onChange={(event) => setEditCustomerForm({ ...editCustomerForm, phone: event.target.value })} placeholder="请输入联系电话" />
            </Field>
            <Field label="邮箱">
              <Input type="email" value={editCustomerForm.email} onChange={(event) => setEditCustomerForm({ ...editCustomerForm, email: event.target.value })} placeholder="请输入邮箱" />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={closeEditCustomer}>取消</Button>
              <Button type="submit">保存修改</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {deleteCustomerTarget ? (
        <ConfirmDialog
          title="删除客户确认"
          confirmLabel="确认删除"
          confirmVariant="danger"
          onCancel={() => setDeleteCustomerTarget(null)}
          onConfirm={() => void deleteCustomer(deleteCustomerTarget)}
        >
          <p>确认删除客户「{deleteCustomerTarget.name}」吗？删除后该客户将不再出现在客户列表中。</p>
        </ConfirmDialog>
      ) : null}
      {statusCustomerTarget ? (
        <ConfirmDialog
          title={`${statusCustomerTarget.status === '启用' ? '禁用' : '启用'}客户确认`}
          confirmLabel={`确认${statusCustomerTarget.status === '启用' ? '禁用' : '启用'}`}
          confirmVariant="primary"
          onCancel={() => setStatusCustomerTarget(null)}
          onConfirm={() => void toggleCustomerStatus(statusCustomerTarget)}
        >
          <p>确认{statusCustomerTarget.status === '启用' ? '禁用' : '启用'}客户「{statusCustomerTarget.name}」吗？</p>
        </ConfirmDialog>
      ) : null}
    </>
  );
}