import { useState, useMemo } from 'react';
import {
  Typography,
  Button,
  Card,
  Table,
  Space,
  Tag,
  Modal,
  Form,
  Input,
  Select,
  Spin,
  Alert,
  Drawer,
  Descriptions,
  Row,
  Col,
  Statistic,
  DatePicker,
  Divider,
  List,
  Checkbox,
  Radio,
  Tooltip,
} from 'antd';
import { showSuccess, showError, showWarning } from '@/lib/errorHandling';
import {
  PlusOutlined,
  SearchOutlined,
  EyeOutlined,
  CheckOutlined,
  StopOutlined,
  FileTextOutlined,
  ShoppingCartOutlined,
  FileDoneOutlined,
  BarcodeOutlined,
} from '@ant-design/icons';
import dayjs from 'dayjs';
import { useCompany } from '@/hooks/useCompany';
import { useCurrentFiscalYear } from '@/stores/periodStore';
import { useOrders } from '@/api/queries/orderQueries';
import { useActiveCustomers, type Customer } from '@/api/queries/customerQueries';
import { useActiveProducts, type Product } from '@/api/queries/productQueries';
import {
  useCreateOrder,
  useAddOrderLine,
  useConfirmOrder,
  useCancelOrder,
  useConvertOrderToInvoice,
  type CreateOrderInput,
  type AddOrderLineInput,
  type CancelOrderInput,
  type InvoiceOrderLinesInput,
} from '@/api/mutations/orderMutations';
import { formatCurrency, formatDate } from '@/lib/formatters';
import { spacing } from '@/styles/designTokens';
import { accountingColors } from '@/styles/theme';
import { AmountText } from '@/components/shared/AmountText';
import { EmptyState } from '@/components/shared/EmptyState';
import { PageHeader } from '@/components/shared/PageHeader';
import type { ColumnsType } from 'antd/es/table';
import type { Order, OrderLine, OrderStatus } from '@/types/order';
import { ORDER_STATUS_LABELS, ORDER_STATUS_COLORS } from '@/types/order';

const { Title, Text } = Typography;

export default function Ordrer() {
  const { company } = useCompany();
  const currentFiscalYear = useCurrentFiscalYear();

  const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
  const [isAddLineModalOpen, setIsAddLineModalOpen] = useState(false);
  const [isCancelModalOpen, setIsCancelModalOpen] = useState(false);
  const [isConvertModalOpen, setIsConvertModalOpen] = useState(false);
  const [isDrawerOpen, setIsDrawerOpen] = useState(false);
  const [selectedOrder, setSelectedOrder] = useState<Order | null>(null);
  const [selectedLinesToInvoice, setSelectedLinesToInvoice] = useState<number[]>([]);
  const [searchText, setSearchText] = useState('');
  const [statusFilter, setStatusFilter] = useState<OrderStatus | 'all'>('all');
  const [addLineMode, setAddLineMode] = useState<'product' | 'freetext'>('product');
  const [selectedProductId, setSelectedProductId] = useState<string | null>(null);
  const [createForm] = Form.useForm();
  const [addLineForm] = Form.useForm();
  const [cancelForm] = Form.useForm();

  // Fetch orders
  const {
    data: orders = [],
    isLoading: loading,
    error,
    refetch,
  } = useOrders(company?.id);

  // Fetch customers for dropdown
  const { data: customers = [] } = useActiveCustomers(company?.id);

  // Fetch products for dropdown
  const { data: products = [] } = useActiveProducts(company?.id);

  // Mutations
  const createOrderMutation = useCreateOrder();
  const addOrderLineMutation = useAddOrderLine();
  const confirmOrderMutation = useConfirmOrder();
  const cancelOrderMutation = useCancelOrder();
  const convertToInvoiceMutation = useConvertOrderToInvoice();

  // Filter orders
  const filteredOrders = useMemo(() => {
    return orders.filter((order) => {
      const matchesSearch =
        searchText === '' ||
        order.orderNumber.toLowerCase().includes(searchText.toLowerCase()) ||
        order.customerName.toLowerCase().includes(searchText.toLowerCase());

      const matchesStatus = statusFilter === 'all' || order.status === statusFilter;

      return matchesSearch && matchesStatus;
    });
  }, [orders, searchText, statusFilter]);

  // Statistics
  const stats = useMemo(() => {
    const total = orders.length;
    const drafts = orders.filter((o) => o.status === 'draft').length;
    const confirmed = orders.filter((o) => o.status === 'confirmed').length;
    const totalValue = orders
      .filter((o) => o.status !== 'cancelled')
      .reduce((sum, o) => sum + o.amountTotal, 0);
    const invoicedValue = orders.reduce((sum, o) => sum + (o.amountTotal - (o.uninvoicedAmount ?? 0)), 0);
    return { total, drafts, confirmed, totalValue, invoicedValue };
  }, [orders]);

  const handleCreateOrder = () => {
    createForm.resetFields();
    createForm.setFieldsValue({
      orderDate: dayjs(),
    });
    setIsCreateModalOpen(true);
  };

  const handleSubmitCreate = async () => {
    if (!company || !currentFiscalYear) {
      showError('Virksomhed eller regnskabsår ikke valgt');
      return;
    }
    try {
      const values = await createForm.validateFields();
      const input: CreateOrderInput = {
        companyId: company.id,
        fiscalYearId: currentFiscalYear.id,
        customerId: values.customerId,
        orderDate: values.orderDate?.toISOString(),
        expectedDeliveryDate: values.expectedDeliveryDate?.toISOString(),
        notes: values.notes || undefined,
        reference: values.reference || undefined,
      };
      const result = await createOrderMutation.mutateAsync(input);
      showSuccess('Ordre oprettet');
      setIsCreateModalOpen(false);
      createForm.resetFields();
      setSelectedOrder(result);
      setIsDrawerOpen(true);
    } catch (err) {
      if (err instanceof Error) {
        showError(err);
      }
    }
  };

  const handleViewOrder = (order: Order) => {
    setSelectedOrder(order);
    setIsDrawerOpen(true);
  };

  const handleOpenAddLineModal = () => {
    addLineForm.resetFields();
    addLineForm.setFieldsValue({
      quantity: 1,
      vatCode: 'S25',
    });
    setAddLineMode('product');
    setSelectedProductId(null);
    setIsAddLineModalOpen(true);
  };

  const handleProductSelect = (productId: string) => {
    setSelectedProductId(productId);
    const product = products.find((p: Product) => p.id === productId);
    if (product) {
      addLineForm.setFieldsValue({
        description: product.name,
        unitPrice: product.unitPrice,
        unit: product.unit || 'stk',
        vatCode: product.vatCode || 'S25',
      });
    }
  };

  const handleSubmitAddLine = async () => {
    if (!selectedOrder) return;
    try {
      const values = await addLineForm.validateFields();
      const input: AddOrderLineInput = {
        orderId: selectedOrder.id,
        productId: addLineMode === 'product' && selectedProductId ? selectedProductId : undefined,
        description: values.description,
        quantity: Number(values.quantity),
        unitPrice: Number(values.unitPrice),
        unit: values.unit || undefined,
        discountPercent: values.discountPercent ? Number(values.discountPercent) : undefined,
        vatCode: values.vatCode,
      };
      const updatedOrder = await addOrderLineMutation.mutateAsync(input);
      showSuccess('Linje tilføjet');
      setIsAddLineModalOpen(false);
      addLineForm.resetFields();
      setSelectedProductId(null);
      setSelectedOrder(updatedOrder);
    } catch (err) {
      if (err instanceof Error) {
        showError(err);
      }
    }
  };

  const handleConfirmOrder = async () => {
    if (!selectedOrder) return;
    if (selectedOrder.lines.length === 0) {
      showWarning('Tilføj mindst en linje før bekræftelse');
      return;
    }
    try {
      await confirmOrderMutation.mutateAsync(selectedOrder.id);
      showSuccess('Ordre bekræftet');
      // Refresh would happen via query invalidation
    } catch (err) {
      if (err instanceof Error) {
        showError(err);
      }
    }
  };

  const handleOpenCancelModal = () => {
    cancelForm.resetFields();
    setIsCancelModalOpen(true);
  };

  const handleSubmitCancel = async () => {
    if (!selectedOrder) return;
    try {
      const values = await cancelForm.validateFields();
      const input: CancelOrderInput = {
        orderId: selectedOrder.id,
        reason: values.reason,
      };
      await cancelOrderMutation.mutateAsync(input);
      showSuccess('Ordre annulleret');
      setIsCancelModalOpen(false);
      cancelForm.resetFields();
    } catch (err) {
      if (err instanceof Error) {
        showError(err);
      }
    }
  };

  const handleOpenConvertModal = () => {
    if (!selectedOrder) return;
    // Pre-select uninvoiced lines
    const uninvoicedLines = selectedOrder.lines
      .filter((line) => !line.isInvoiced)
      .map((line) => line.lineNumber);
    setSelectedLinesToInvoice(uninvoicedLines);
    setIsConvertModalOpen(true);
  };

  const handleSubmitConvert = async () => {
    if (!selectedOrder || selectedLinesToInvoice.length === 0) {
      showWarning('Vælg mindst en linje at fakturere');
      return;
    }
    try {
      const input: InvoiceOrderLinesInput = {
        orderId: selectedOrder.id,
        lineNumbers: selectedLinesToInvoice,
      };
      const invoice = await convertToInvoiceMutation.mutateAsync(input);
      showSuccess(`Faktura ${invoice.invoiceNumber} oprettet fra ordre`);
      setIsConvertModalOpen(false);
      setSelectedLinesToInvoice([]);
      // Refresh the selected order to show updated invoice tracking
      refetch();
    } catch (err) {
      if (err instanceof Error) {
        showError(err);
      }
    }
  };

  // Check if order can show the convert to invoice button
  const canShowConvertToInvoice = (order: Order): boolean => {
    if (order.status === 'cancelled' || order.status === 'fully_invoiced') {
      return false;
    }
    // Show for draft (disabled) and confirmed/partially_invoiced (enabled)
    return order.status === 'draft' || order.lines.some((line) => !line.isInvoiced);
  };

  // Check if convert to invoice button should be disabled
  const isConvertToInvoiceDisabled = (order: Order): boolean => {
    if (order.status === 'draft') {
      return true; // Must confirm order first
    }
    return !order.lines.some((line) => !line.isInvoiced);
  };

  const columns: ColumnsType<Order> = [
    {
      title: 'Ordrenr.',
      dataIndex: 'orderNumber',
      key: 'orderNumber',
      width: 140,
      sorter: (a, b) => a.orderNumber.localeCompare(b.orderNumber),
      render: (value: string) => <Text code>{value}</Text>,
    },
    {
      title: 'Kunde',
      dataIndex: 'customerName',
      key: 'customerName',
      sorter: (a, b) => a.customerName.localeCompare(b.customerName),
      ellipsis: true,
    },
    {
      title: 'Dato',
      dataIndex: 'orderDate',
      key: 'orderDate',
      width: 100,
      sorter: (a, b) => (a.orderDate || '').localeCompare(b.orderDate || ''),
      render: (value: string | undefined) => (value ? formatDate(value) : '-'),
    },
    {
      title: 'Forventet levering',
      dataIndex: 'expectedDeliveryDate',
      key: 'expectedDeliveryDate',
      width: 130,
      render: (value: string | undefined) => (value ? formatDate(value) : '-'),
    },
    {
      title: 'Beløb',
      dataIndex: 'amountTotal',
      key: 'amountTotal',
      width: 120,
      align: 'right',
      sorter: (a, b) => a.amountTotal - b.amountTotal,
      render: (value: number) => <AmountText amount={value} />,
    },
    {
      title: 'Faktureret',
      dataIndex: 'amountInvoiced',
      key: 'amountInvoiced',
      width: 120,
      align: 'right',
      render: (value: number, record: Order) =>
        record.status === 'cancelled' ? '-' : <AmountText amount={value} />,
    },
    {
      title: 'Status',
      dataIndex: 'status',
      key: 'status',
      width: 140,
      align: 'center',
      filters: [
        { text: 'Kladde', value: 'draft' },
        { text: 'Bekræftet', value: 'confirmed' },
        { text: 'Delvist faktureret', value: 'partially_invoiced' },
        { text: 'Fuldt faktureret', value: 'fully_invoiced' },
        { text: 'Annulleret', value: 'cancelled' },
      ],
      onFilter: (value, record) => record.status === value,
      render: (value: OrderStatus) => (
        <Tag color={ORDER_STATUS_COLORS[value]}>{ORDER_STATUS_LABELS[value]}</Tag>
      ),
    },
    {
      title: '',
      key: 'actions',
      width: 80,
      align: 'center',
      render: (_: unknown, record: Order) => (
        <Button
          type="text"
          size="small"
          icon={<EyeOutlined />}
          onClick={() => handleViewOrder(record)}
        />
      ),
    },
  ];

  return (
    <div>
      <PageHeader
        title="Ordrer"
        subtitle={company?.name}
        breadcrumbs={[{ title: 'Fakturering', path: '/fakturaer' }, { title: 'Ordrer' }]}
        extra={
          <Button type="primary" icon={<PlusOutlined />} onClick={handleCreateOrder}>
            Ny ordre
          </Button>
        }
      />

      {/* Error State */}
      {error && (
        <Alert
          message="Fejl ved indlæsning af ordrer"
          description={error.message}
          type="error"
          showIcon
          style={{ marginBottom: spacing.lg }}
          action={
            <Button size="small" onClick={() => refetch()}>
              Prøv igen
            </Button>
          }
        />
      )}

      {/* Statistics */}
      <Row gutter={[spacing.lg, spacing.lg]} style={{ marginBottom: spacing.lg }}>
        <Col xs={12} sm={6}>
          <Card size="small">
            <Statistic title="Ordrer i alt" value={stats.total} />
          </Card>
        </Col>
        <Col xs={12} sm={6}>
          <Card size="small">
            <Statistic
              title="Kladder"
              value={stats.drafts}
              valueStyle={{ color: '#8c8c8c' }}
            />
          </Card>
        </Col>
        <Col xs={12} sm={6}>
          <Card size="small">
            <Statistic
              title="Bekræftede"
              value={stats.confirmed}
              valueStyle={{ color: accountingColors.credit }}
            />
          </Card>
        </Col>
        <Col xs={12} sm={6}>
          <Card size="small">
            <Statistic
              title="Samlet værdi"
              value={stats.totalValue}
              precision={2}
              valueStyle={{ color: accountingColors.credit }}
              formatter={(value) => formatCurrency(value as number)}
            />
          </Card>
        </Col>
      </Row>

      {/* Filters */}
      <Card size="small" style={{ marginBottom: spacing.lg }}>
        <Space wrap>
          <Input
            placeholder="Søg ordre..."
            prefix={<SearchOutlined />}
            value={searchText}
            onChange={(e) => setSearchText(e.target.value)}
            style={{ width: 250 }}
            allowClear
          />
          <Select
            value={statusFilter}
            onChange={setStatusFilter}
            style={{ width: 180 }}
            options={[
              { value: 'all', label: 'Alle status' },
              { value: 'draft', label: 'Kladde' },
              { value: 'confirmed', label: 'Bekræftet' },
              { value: 'partially_invoiced', label: 'Delvist faktureret' },
              { value: 'fully_invoiced', label: 'Fuldt faktureret' },
              { value: 'cancelled', label: 'Annulleret' },
            ]}
          />
        </Space>
      </Card>

      {/* Order Table */}
      <Card size="small">
        {loading ? (
          <Spin tip="Indlæser ordrer..." style={{ display: 'block', textAlign: 'center', padding: spacing.xl }}>
            <div style={{ minHeight: 200 }} />
          </Spin>
        ) : filteredOrders.length > 0 ? (
          <Table
            dataSource={filteredOrders}
            columns={columns}
            rowKey="id"
            size="small"
            pagination={{ pageSize: 20, showSizeChanger: true }}
          />
        ) : (
          <EmptyState
            variant="default"
            title="Ingen ordrer"
            description={searchText ? 'Ingen ordrer matcher din søgning' : 'Opret din første ordre'}
            primaryAction={
              !searchText
                ? {
                    label: 'Opret ordre',
                    onClick: handleCreateOrder,
                    icon: <PlusOutlined />,
                  }
                : undefined
            }
          />
        )}
      </Card>

      {/* Create Order Modal */}
      <Modal
        title="Opret ordre"
        open={isCreateModalOpen}
        onCancel={() => setIsCreateModalOpen(false)}
        onOk={handleSubmitCreate}
        okText="Opret"
        cancelText="Annuller"
        confirmLoading={createOrderMutation.isPending}
      >
        <Form form={createForm} layout="vertical">
          <Form.Item
            name="customerId"
            label="Kunde"
            rules={[{ required: true, message: 'Vælg kunde' }]}
          >
            <Select
              showSearch
              placeholder="Vælg kunde"
              optionFilterProp="children"
              filterOption={(input, option) =>
                (option?.label ?? '').toLowerCase().includes(input.toLowerCase())
              }
              options={customers.map((c: Customer) => ({
                value: c.id,
                label: `${c.customerNumber} - ${c.name}`,
              }))}
            />
          </Form.Item>
          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="orderDate" label="Ordredato">
                <DatePicker style={{ width: '100%' }} format="DD-MM-YYYY" />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item name="expectedDeliveryDate" label="Forventet levering">
                <DatePicker style={{ width: '100%' }} format="DD-MM-YYYY" />
              </Form.Item>
            </Col>
          </Row>
          <Form.Item name="reference" label="Reference">
            <Input placeholder="Projektnavn, tilbudsnr., etc." />
          </Form.Item>
          <Form.Item name="notes" label="Bemærkninger">
            <Input.TextArea rows={2} />
          </Form.Item>
        </Form>
      </Modal>

      {/* Order Detail Drawer */}
      <Drawer
        title={
          selectedOrder && (
            <Space>
              <ShoppingCartOutlined />
              <span>Ordre {selectedOrder.orderNumber}</span>
              <Tag color={ORDER_STATUS_COLORS[selectedOrder.status]}>
                {ORDER_STATUS_LABELS[selectedOrder.status]}
              </Tag>
            </Space>
          )
        }
        placement="right"
        width={700}
        open={isDrawerOpen}
        onClose={() => {
          setIsDrawerOpen(false);
          setSelectedOrder(null);
        }}
        extra={
          selectedOrder && (
            <Space>
              {selectedOrder.status === 'draft' && (
                <>
                  <Button
                    icon={<PlusOutlined />}
                    onClick={handleOpenAddLineModal}
                    loading={addOrderLineMutation.isPending}
                  >
                    Tilføj linje
                  </Button>
                  <Button
                    type="primary"
                    icon={<CheckOutlined />}
                    onClick={handleConfirmOrder}
                    loading={confirmOrderMutation.isPending}
                    disabled={selectedOrder.lines.length === 0}
                  >
                    Bekræft
                  </Button>
                </>
              )}
              {canShowConvertToInvoice(selectedOrder) && (
                <Tooltip
                  title={selectedOrder.status === 'draft' ? 'Bekræft ordren først' : undefined}
                >
                  <Button
                    type="primary"
                    icon={<FileDoneOutlined />}
                    onClick={handleOpenConvertModal}
                    disabled={isConvertToInvoiceDisabled(selectedOrder)}
                  >
                    Opret faktura
                  </Button>
                </Tooltip>
              )}
              {selectedOrder.status !== 'cancelled' && selectedOrder.status !== 'fully_invoiced' && (
                <Button danger icon={<StopOutlined />} onClick={handleOpenCancelModal}>
                  Annuller
                </Button>
              )}
            </Space>
          )
        }
      >
        {selectedOrder && (
          <div>
            <Descriptions column={2} size="small" bordered style={{ marginBottom: spacing.lg }}>
              <Descriptions.Item label="Kunde" span={2}>
                {selectedOrder.customerName}
              </Descriptions.Item>
              <Descriptions.Item label="Ordredato">
                {selectedOrder.orderDate ? formatDate(selectedOrder.orderDate) : '-'}
              </Descriptions.Item>
              <Descriptions.Item label="Forventet levering">
                {selectedOrder.expectedDeliveryDate ? formatDate(selectedOrder.expectedDeliveryDate) : '-'}
              </Descriptions.Item>
              {selectedOrder.reference && (
                <Descriptions.Item label="Reference" span={2}>
                  {selectedOrder.reference}
                </Descriptions.Item>
              )}
            </Descriptions>

            <Title level={5}>Linjer</Title>
            {selectedOrder.lines.length > 0 ? (
              <List
                size="small"
                bordered
                dataSource={selectedOrder.lines}
                renderItem={(line: OrderLine) => {
                  const linkedProduct = line.productId
                    ? products.find((p: Product) => p.id === line.productId)
                    : null;
                  return (
                    <List.Item>
                      <List.Item.Meta
                        title={
                          <Space>
                            <span>{line.description}</span>
                            {line.productId && (
                              <Tag color="purple" icon={<BarcodeOutlined />}>
                                {linkedProduct?.productNumber || 'Produkt'}
                              </Tag>
                            )}
                            {line.isInvoiced && (
                              <Tag color="green" icon={<FileTextOutlined />}>
                                Faktureret
                              </Tag>
                            )}
                          </Space>
                        }
                        description={
                          <Space>
                            <span>
                              {line.quantity} {line.unit || 'stk'} x {formatCurrency(line.unitPrice)}
                            </span>
                            {line.discountPercent > 0 && (
                              <Tag color="orange">-{line.discountPercent}%</Tag>
                            )}
                            <Tag>{line.vatCode}</Tag>
                            {line.isInvoiced && line.invoicedAt && (
                              <Tag color="blue">
                                Faktureret: {dayjs(line.invoicedAt).format('DD/MM/YYYY')}
                              </Tag>
                            )}
                          </Space>
                        }
                      />
                      <AmountText amount={line.amountTotal} style={{ fontWeight: 'bold' }} />
                    </List.Item>
                  );
                }}
              />
            ) : (
              <Alert
                message="Ingen linjer endnu"
                description="Tilføj linjer for at kunne bekræfte ordren."
                type="info"
                showIcon
              />
            )}

            <Divider />

            <Row gutter={16}>
              <Col span={12}>
                {selectedOrder.notes && (
                  <>
                    <Text type="secondary">Bemærkninger:</Text>
                    <p>{selectedOrder.notes}</p>
                  </>
                )}
                {selectedOrder.cancelledReason && (
                  <>
                    <Text type="secondary">Annulleringsårsag:</Text>
                    <p style={{ color: 'red' }}>{selectedOrder.cancelledReason}</p>
                  </>
                )}
              </Col>
              <Col span={12}>
                <div style={{ textAlign: 'right' }}>
                  <div style={{ marginBottom: 4 }}>
                    <Text type="secondary">Beløb ex. moms: </Text>
                    <Text>{formatCurrency(selectedOrder.amountExVat)}</Text>
                  </div>
                  <div style={{ marginBottom: 4 }}>
                    <Text type="secondary">Moms: </Text>
                    <Text>{formatCurrency(selectedOrder.amountVat)}</Text>
                  </div>
                  <div style={{ marginBottom: 4 }}>
                    <Text strong>Total: </Text>
                    <Text strong style={{ fontSize: 16 }}>
                      {formatCurrency(selectedOrder.amountTotal)}
                    </Text>
                  </div>
                  {(selectedOrder.uninvoicedAmount ?? selectedOrder.amountTotal) < selectedOrder.amountTotal && (
                    <div style={{ marginBottom: 4 }}>
                      <Text type="secondary">Faktureret: </Text>
                      <Text type="success">{formatCurrency(selectedOrder.amountTotal - (selectedOrder.uninvoicedAmount ?? 0))}</Text>
                    </div>
                  )}
                  {(selectedOrder.uninvoicedAmount ?? 0) > 0 &&
                    selectedOrder.status !== 'cancelled' && (
                      <div>
                        <Text type="secondary">Resterende: </Text>
                        <Text type="warning" strong>
                          {formatCurrency(selectedOrder.uninvoicedAmount ?? 0)}
                        </Text>
                      </div>
                    )}
                </div>
              </Col>
            </Row>
          </div>
        )}
      </Drawer>

      {/* Cancel Order Modal */}
      <Modal
        title="Annuller ordre"
        open={isCancelModalOpen}
        onCancel={() => setIsCancelModalOpen(false)}
        onOk={handleSubmitCancel}
        okText="Annuller ordre"
        okButtonProps={{ danger: true }}
        cancelText="Fortryd"
        confirmLoading={cancelOrderMutation.isPending}
      >
        <Alert
          message="Advarsel"
          description="At annullere ordren kan ikke fortrydes. Eventuelle delfaktureringer forbliver uændrede."
          type="warning"
          showIcon
          style={{ marginBottom: spacing.lg }}
        />
        <Form form={cancelForm} layout="vertical">
          <Form.Item
            name="reason"
            label="Årsag til annullering"
            rules={[{ required: true, message: 'Angiv årsag' }]}
          >
            <Input.TextArea rows={3} placeholder="Beskriv hvorfor ordren annulleres" />
          </Form.Item>
        </Form>
      </Modal>

      {/* Add Line Modal */}
      <Modal
        title="Tilføj linje"
        open={isAddLineModalOpen}
        onCancel={() => {
          setIsAddLineModalOpen(false);
          setSelectedProductId(null);
        }}
        onOk={handleSubmitAddLine}
        okText="Tilføj"
        cancelText="Annuller"
        confirmLoading={addOrderLineMutation.isPending}
        width={550}
      >
        <Form form={addLineForm} layout="vertical">
          <Form.Item label="Linjetype" style={{ marginBottom: spacing.md }}>
            <Radio.Group
              value={addLineMode}
              onChange={(e) => {
                setAddLineMode(e.target.value);
                setSelectedProductId(null);
                addLineForm.resetFields();
                addLineForm.setFieldsValue({
                  quantity: 1,
                  vatCode: 'S25',
                });
              }}
              optionType="button"
              buttonStyle="solid"
            >
              <Radio.Button value="product">Vælg produkt</Radio.Button>
              <Radio.Button value="freetext">Fritekst</Radio.Button>
            </Radio.Group>
          </Form.Item>

          {addLineMode === 'product' && (
            <Form.Item
              label="Produkt"
              required
              validateStatus={addLineMode === 'product' && !selectedProductId ? 'error' : undefined}
              help={addLineMode === 'product' && !selectedProductId ? 'Vælg et produkt' : undefined}
            >
              <Select
                showSearch
                placeholder="Søg efter produkt..."
                optionFilterProp="children"
                value={selectedProductId}
                onChange={handleProductSelect}
                filterOption={(input, option) =>
                  (option?.label ?? '').toLowerCase().includes(input.toLowerCase())
                }
                options={products.map((p: Product) => ({
                  value: p.id,
                  label: `${p.productNumber || ''} ${p.name}`.trim(),
                }))}
              />
            </Form.Item>
          )}

          <Form.Item
            name="description"
            label="Beskrivelse"
            rules={[{ required: true, message: 'Angiv beskrivelse' }]}
          >
            <Input
              placeholder="Vare eller ydelse"
              disabled={addLineMode === 'product' && !!selectedProductId}
            />
          </Form.Item>
          <Row gutter={16}>
            <Col span={8}>
              <Form.Item
                name="quantity"
                label="Antal"
                rules={[{ required: true, message: 'Angiv antal' }]}
              >
                <Input type="number" min={0} step={1} />
              </Form.Item>
            </Col>
            <Col span={8}>
              <Form.Item name="unit" label="Enhed">
                <Input
                  placeholder="stk"
                  disabled={addLineMode === 'product' && !!selectedProductId}
                />
              </Form.Item>
            </Col>
            <Col span={8}>
              <Form.Item
                name="unitPrice"
                label="Enhedspris"
                rules={[{ required: true, message: 'Angiv pris' }]}
              >
                <Input
                  type="number"
                  min={0}
                  step={0.01}
                  disabled={addLineMode === 'product' && !!selectedProductId}
                />
              </Form.Item>
            </Col>
          </Row>
          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="discountPercent" label="Rabat (%)">
                <Input type="number" min={0} max={100} step={1} />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item
                name="vatCode"
                label="Momskode"
                rules={[{ required: true, message: 'Vælg momskode' }]}
              >
                <Select
                  disabled={addLineMode === 'product' && !!selectedProductId}
                  options={[
                    { value: 'S25', label: 'S25 - Salgsmoms 25%' },
                    { value: 'S0', label: 'S0 - Momsfrit salg' },
                  ]}
                />
              </Form.Item>
            </Col>
          </Row>
        </Form>
      </Modal>

      {/* Convert to Invoice Modal */}
      <Modal
        title="Opret faktura fra ordre"
        open={isConvertModalOpen}
        onCancel={() => {
          setIsConvertModalOpen(false);
          setSelectedLinesToInvoice([]);
        }}
        onOk={handleSubmitConvert}
        okText="Opret faktura"
        cancelText="Annuller"
        confirmLoading={convertToInvoiceMutation.isPending}
        width={600}
      >
        <Alert
          message="Vælg linjer til fakturering"
          description="Vælg hvilke ordrelinjer der skal inkluderes i fakturaen. Du kan fakturere delvist og oprette flere fakturaer senere."
          type="info"
          showIcon
          style={{ marginBottom: spacing.lg }}
        />
        {selectedOrder && (
          <List
            size="small"
            bordered
            dataSource={selectedOrder.lines.filter((line) => !line.isInvoiced)}
            renderItem={(line: OrderLine) => (
              <List.Item>
                <Checkbox
                  checked={selectedLinesToInvoice.includes(line.lineNumber)}
                  onChange={(e) => {
                    if (e.target.checked) {
                      setSelectedLinesToInvoice([...selectedLinesToInvoice, line.lineNumber]);
                    } else {
                      setSelectedLinesToInvoice(
                        selectedLinesToInvoice.filter((n) => n !== line.lineNumber)
                      );
                    }
                  }}
                >
                  <Space direction="vertical" size={0}>
                    <Text>{line.description}</Text>
                    <Text type="secondary">
                      {line.quantity} {line.unit || 'stk'} x{' '}
                      {formatCurrency(line.unitPrice)} ={' '}
                      {formatCurrency(line.amountTotal)}
                    </Text>
                  </Space>
                </Checkbox>
              </List.Item>
            )}
          />
        )}
      </Modal>
    </div>
  );
}