import React, { useState, useEffect } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { api } from '@/lib/api';
import { SettingsLayout } from './components/SettingsLayout';
import { SettingsCard } from './components/SettingsCard';
import { ToggleField } from './components/ToggleField';
import { Button } from '@/components/ui/button';
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from '@/components/ui/alert-dialog';
import { Drawer, DrawerContent, DrawerHeader, DrawerTitle } from '@/components/ui/drawer';
import { Accordion, AccordionContent, AccordionItem, AccordionTrigger } from '@/components/ui/accordion';
import { Globe, Truck, MapPin, Edit, Trash2, RefreshCw, Loader2, ExternalLink, Settings, Plus, X, ChevronDown } from 'lucide-react';
import { toast } from 'sonner';
import { __ } from '@/lib/i18n';
import { useMediaQuery } from '@/hooks/use-media-query';

interface ShippingRate {
  id: string;
  name: string;
  price: string;
  condition?: string;
  transitTime?: string;
}

interface ShippingZone {
  id: string;
  name: string;
  regions: string;
  rates: ShippingRate[];
}

export default function ShippingPage() {
  const queryClient = useQueryClient();
  const wcAdminUrl = (window as any).WNW_CONFIG?.wpAdminUrl || '/wp-admin';
  const [togglingMethod, setTogglingMethod] = useState<string | null>(null);
  const [selectedZone, setSelectedZone] = useState<any | null>(null);
  const [showAddMethod, setShowAddMethod] = useState(false);
  const [showAvailableMethods, setShowAvailableMethods] = useState(false);
  const [expandedMethod, setExpandedMethod] = useState<string>('');
  const [methodSettings, setMethodSettings] = useState<Record<string, any>>({});
  const [deletingMethod, setDeletingMethod] = useState<{ zoneId: number; instanceId: number; name: string } | null>(null);
  const [showAddZone, setShowAddZone] = useState(false);
  const [editingZone, setEditingZone] = useState<any | null>(null);
  const [deletingZone, setDeletingZone] = useState<any | null>(null);
  const [regionSearch, setRegionSearch] = useState('');
  const isDesktop = useMediaQuery("(min-width: 768px)");
  
  // Fetch shipping zones from WooCommerce
  const { data: zones = [], isLoading, refetch } = useQuery({
    queryKey: ['shipping-zones'],
    queryFn: () => api.get('/settings/shipping/zones'),
    staleTime: 5 * 60 * 1000, // 5 minutes
  });

  // Fetch available shipping methods
  const { data: availableMethods = [] } = useQuery({
    queryKey: ['available-shipping-methods'],
    queryFn: () => api.get('/settings/shipping/methods/available'),
    enabled: showAvailableMethods,
  });

  // Fetch available locations (countries/states) for zone regions
  const { data: availableLocations = [] } = useQuery({
    queryKey: ['available-locations'],
    queryFn: () => api.get('/settings/shipping/locations'),
    enabled: showAddZone || !!editingZone,
  });

  // Sync selectedZone with zones data when it changes
  useEffect(() => {
    if (selectedZone && zones && zones.length > 0) {
      const updatedZone = zones.find((z: any) => z.id === selectedZone.id);
      if (updatedZone && JSON.stringify(updatedZone) !== JSON.stringify(selectedZone)) {
        setSelectedZone(updatedZone);
      }
    }
  }, [zones, selectedZone]);

  // Toggle shipping method mutation
  const toggleMutation = useMutation({
    mutationFn: async ({ zoneId, instanceId, enabled }: { zoneId: number; instanceId: number; enabled: boolean }) => {
      return api.post(`/settings/shipping/zones/${zoneId}/methods/${instanceId}/toggle`, { enabled });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Shipping method updated successfully'));
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to update shipping method'));
    },
    onSettled: () => {
      setTogglingMethod(null);
    },
  });

  // Add shipping method mutation
  const addMethodMutation = useMutation({
    mutationFn: async ({ zoneId, methodId }: { zoneId: number; methodId: string }) => {
      return api.post(`/settings/shipping/zones/${zoneId}/methods`, { method_id: methodId });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Shipping method added successfully'));
      setShowAddMethod(false);
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to add shipping method'));
    },
  });

  // Delete shipping method mutation
  const deleteMethodMutation = useMutation({
    mutationFn: async ({ zoneId, instanceId }: { zoneId: number; instanceId: number }) => {
      return api.del(`/settings/shipping/zones/${zoneId}/methods/${instanceId}`);
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Delivery option deleted'));
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to delete delivery option'));
    },
  });

  // Fetch method settings when accordion expands
  const fetchMethodSettings = async (instanceId: number) => {
    if (!selectedZone || methodSettings[instanceId]) return;
    
    try {
      const settings = await api.get(`/settings/shipping/zones/${selectedZone.id}/methods/${instanceId}/settings`);
      setMethodSettings(prev => ({ ...prev, [instanceId]: settings }));
    } catch (error) {
      console.error('Failed to fetch method settings:', error);
    }
  };

  // Update method settings mutation
  const updateSettingsMutation = useMutation({
    mutationFn: async ({ zoneId, instanceId, settings }: { zoneId: number; instanceId: number; settings: any }) => {
      return api.post(`/settings/shipping/zones/${zoneId}/methods/${instanceId}/settings`, { settings });
    },
    onSuccess: (_, variables) => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      // Clear cached settings to force refetch
      setMethodSettings(prev => {
        const newSettings = { ...prev };
        delete newSettings[variables.instanceId];
        return newSettings;
      });
      toast.success(__('Settings saved'));
      setExpandedMethod('');
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to save settings'));
    },
  });

  const handleToggle = (zoneId: number, instanceId: number, enabled: boolean) => {
    setTogglingMethod(`${zoneId}-${instanceId}`);
    toggleMutation.mutate({ zoneId, instanceId, enabled });
  };

  const handleAddMethod = (methodId: string) => {
    if (selectedZone) {
      addMethodMutation.mutate({ zoneId: selectedZone.id, methodId });
    }
  };

  const handleDeleteMethod = (instanceId: number, methodName: string) => {
    if (selectedZone) {
      setDeletingMethod({ zoneId: selectedZone.id, instanceId, name: methodName });
    }
  };

  const confirmDelete = () => {
    if (deletingMethod) {
      deleteMethodMutation.mutate({ 
        zoneId: deletingMethod.zoneId, 
        instanceId: deletingMethod.instanceId 
      });
      setDeletingMethod(null);
    }
  };

  // Zone mutations
  const createZoneMutation = useMutation({
    mutationFn: async (data: { name: string; regions: any[] }) => {
      return api.post('/settings/shipping/zones', data);
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Zone created successfully'));
      setShowAddZone(false);
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to create zone'));
    },
  });

  const updateZoneMutation = useMutation({
    mutationFn: async ({ zoneId, ...data }: { zoneId: number; name?: string; regions?: any[] }) => {
      return api.wpFetch(`/woonoow/v1/settings/shipping/zones/${zoneId}`, {
        method: 'PUT',
        body: JSON.stringify(data),
      });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Zone updated successfully'));
      setEditingZone(null);
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to update zone'));
    },
  });

  const deleteZoneMutation = useMutation({
    mutationFn: async (zoneId: number) => {
      return api.del(`/settings/shipping/zones/${zoneId}`);
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['shipping-zones'] });
      toast.success(__('Zone deleted successfully'));
      setDeletingZone(null);
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to delete zone'));
    },
  });

  if (isLoading) {
    return (
      <SettingsLayout 
        title={__('Shipping & Delivery')} 
        description={__('Manage how you ship products to customers')}
      >
        <div className="flex items-center justify-center py-12">
          <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
        </div>
      </SettingsLayout>
    );
  }

  return (
    <SettingsLayout
      title={__('Shipping & Delivery')}
      description={__('Manage how you ship products to customers')}
      action={
        <Button
          variant="outline"
          size="sm"
          onClick={() => refetch()}
          disabled={isLoading}
        >
          <RefreshCw className="h-4 w-4 mr-2" />
          {__('Refresh')}
        </Button>
      }
    >
      {/* Shipping Zones */}
      <SettingsCard
        title={__('Shipping Zones')}
        description={__('Create zones to group regions with similar shipping rates')}
        action={
          <Button
            variant="outline"
            size="sm"
            onClick={() => setShowAddZone(true)}
          >
            <Plus className="h-4 w-4 mr-2" />
            {__('Add Zone')}
          </Button>
        }
      >
        {zones.length === 0 ? (
          <div className="text-center py-8">
            <p className="text-sm text-muted-foreground mb-4">
              {__('No shipping zones configured yet. Create your first zone to start offering shipping.')}
            </p>
            <Button
              onClick={() => setShowAddZone(true)}
            >
              <Plus className="h-4 w-4 mr-2" />
              {__('Create First Zone')}
            </Button>
          </div>
        ) : (
          <div className="space-y-4">
            {zones.map((zone: any) => (
            <div
              key={zone.id}
              className="border rounded-lg p-3 md:p-4 hover:border-primary/50 transition-colors"
            >
              <div className="flex items-start justify-between gap-2 md:gap-3 mb-3 md:mb-4">
                <div className="flex items-start gap-2 md:gap-3 flex-1 min-w-0">
                  <div className="p-1.5 md:p-2 bg-primary/10 rounded-lg text-primary flex-shrink-0">
                    <Globe className="h-4 w-4 md:h-5 md:w-5" />
                  </div>
                  <div className="min-w-0 flex-1">
                    <h3 className="font-semibold text-sm md:text-lg">{zone.name}</h3>
                    <p className="text-xs md:text-sm text-muted-foreground truncate">
                      <span className="font-medium">{__('Available to:')}</span> {zone.regions}
                    </p>
                    <p className="text-xs md:text-sm text-muted-foreground">
                      {zone.rates.length} {zone.rates.length === 1 ? __('delivery option') : __('delivery options')}
                    </p>
                  </div>
                </div>
                <div className="flex gap-1 md:gap-2 flex-shrink-0">
                  <Button 
                    variant="ghost" 
                    size="sm"
                    onClick={() => setEditingZone(zone)}
                    title={__('Edit zone name and regions')}
                  >
                    <Edit className="h-4 w-4" />
                  </Button>
                  <Button 
                    variant="ghost" 
                    size="sm"
                    onClick={() => setDeletingZone(zone)}
                    title={__('Delete zone')}
                  >
                    <Trash2 className="h-4 w-4 text-destructive" />
                  </Button>
                  <Button 
                    variant="ghost" 
                    size="sm"
                    onClick={() => setSelectedZone(zone)}
                    title={__('Manage delivery options')}
                  >
                    <Settings className="h-4 w-4" />
                  </Button>
                </div>
              </div>

              {/* Shipping Rates */}
              <div className="pl-0 md:pl-11 space-y-2">
                {zone.rates?.map((rate: any) => (
                  <div
                    key={rate.id}
                    className="flex items-center justify-between gap-2 py-2 px-2 md:px-3 bg-muted/50 rounded-md"
                  >
                    <div className="flex items-center gap-1.5 md:gap-2 flex-1 min-w-0">
                      <div className={`p-1 rounded flex-shrink-0 ${rate.enabled ? 'bg-green-500/20 text-green-500' : 'bg-primary/10 text-primary'}`}>
                        <Truck className="h-3.5 w-3.5 md:h-4 md:w-4" />
                      </div>
                      <div className="flex-1 min-w-0">
                        <span 
                          className="text-xs md:text-sm font-medium line-clamp-1"
                          dangerouslySetInnerHTML={{ __html: rate.name }}
                        />
                        {rate.transitTime && (
                          <span className="text-xs text-muted-foreground ml-2">
                            • {rate.transitTime}
                          </span>
                        )}
                        {rate.condition && (
                          <span className="text-xs text-muted-foreground ml-2">
                            • {rate.condition}
                          </span>
                        )}
                      </div>
                    </div>
                    <div className="flex items-center gap-2 md:gap-3 flex-shrink-0">
                      <span 
                        className="text-xs md:text-sm font-semibold whitespace-nowrap"
                        dangerouslySetInnerHTML={{ __html: rate.price }}
                      />
                      <ToggleField
                        id={`${zone.id}-${rate.instance_id}`}
                        label=""
                        checked={rate.enabled}
                        onCheckedChange={(checked) => handleToggle(zone.id, rate.instance_id, checked)}
                        disabled={togglingMethod === `${zone.id}-${rate.instance_id}`}
                      />
                    </div>
                  </div>
                ))}
              </div>
            </div>
            ))}

            <Button 
              variant="outline" 
              className="w-full"
              asChild
            >
              <a href={`${wcAdminUrl}/admin.php?page=wc-settings&tab=shipping`} target="_blank" rel="noopener noreferrer">
                <ExternalLink className="h-4 w-4 mr-2" />
                {__('Manage Zones in WooCommerce')}
              </a>
            </Button>
          </div>
        )}
      </SettingsCard>

      {/* Help Card */}
      <div className="bg-muted/50 border rounded-lg p-4">
        <p className="text-sm font-medium mb-2">💡 {__('Shipping tips')}</p>
        <ul className="text-sm text-muted-foreground space-y-1">
          <li>• {__('Offer free shipping for orders above a certain amount to increase average order value')}</li>
          <li>• {__('Provide multiple shipping options to give customers flexibility')}</li>
          <li>• {__('Set realistic delivery estimates to manage customer expectations')}</li>
          <li>• {__('Configure detailed shipping settings in WooCommerce for full control')}</li>
        </ul>
      </div>

      {/* Settings Modal/Drawer */}
      {selectedZone && (
        isDesktop ? (
          <Dialog open={!!selectedZone} onOpenChange={(open) => !open && setSelectedZone(null)}>
            <DialogContent className="max-w-2xl max-h-[90vh] flex flex-col p-0">
              <DialogHeader className="px-6 py-4 border-b">
                <DialogTitle>{selectedZone.name}</DialogTitle>
                <p className="text-sm text-muted-foreground mt-1">
                  {selectedZone.regions}
                </p>
              </DialogHeader>
              <div className="flex-1 overflow-y-auto p-6 min-h-0">
                <div className="space-y-4">
                  {/* Add Delivery Option Button */}
                  {!showAvailableMethods ? (
                    <Button
                      variant="outline"
                      className="w-full"
                      onClick={() => setShowAvailableMethods(true)}
                    >
                      <Plus className="h-4 w-4 mr-2" />
                      {__('Add Delivery Option')}
                    </Button>
                  ) : (
                    <div className="border rounded-lg p-4 space-y-3">
                      <div className="flex items-center justify-between mb-2">
                        <h3 className="font-medium">{__('Available Delivery Options')}</h3>
                        <Button
                          variant="ghost"
                          size="sm"
                          onClick={() => setShowAvailableMethods(false)}
                        >
                          <X className="h-4 w-4" />
                        </Button>
                      </div>
                      {availableMethods.map((method: any) => (
                        <button
                          key={method.id}
                          onClick={() => {
                            handleAddMethod(method.id);
                            setShowAvailableMethods(false);
                          }}
                          disabled={addMethodMutation.isPending}
                          className="w-full text-left p-3 border rounded-lg hover:border-primary hover:bg-accent transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
                        >
                          <div className="font-medium text-sm">{method.title}</div>
                          {method.description && (
                            <div className="text-xs text-muted-foreground mt-1">
                              {method.description}
                            </div>
                          )}
                        </button>
                      ))}
                    </div>
                  )}

                  {/* Delivery Options Accordion */}
                  <Accordion type="single" collapsible value={expandedMethod} onValueChange={(value) => {
                    setExpandedMethod(value);
                    if (value) {
                      const instanceId = parseInt(value);
                      fetchMethodSettings(instanceId);
                    }
                  }}>
                    {selectedZone.rates?.map((rate: any) => (
                      <AccordionItem key={rate.id} value={String(rate.instance_id)} className="border rounded-lg mb-2">
                        <AccordionTrigger className="hover:no-underline px-4">
                          <div className="flex items-center gap-3 flex-1">
                            <div className={`p-2 rounded-lg ${rate.enabled ? 'bg-green-500/20 text-green-500' : 'bg-primary/10 text-primary'}`}>
                              <Truck className="h-4 w-4" />
                            </div>
                            <div className="flex-1 text-left">
                              <div className="font-medium" dangerouslySetInnerHTML={{ __html: rate.name }} />
                              <div className="flex items-center gap-2 text-sm text-muted-foreground mt-1">
                                <span className="font-semibold" dangerouslySetInnerHTML={{ __html: rate.price }} />
                                <span className={`text-xs px-2 py-0.5 rounded-full ${
                                  rate.enabled 
                                    ? 'bg-green-100 text-green-700' 
                                    : 'bg-gray-100 text-gray-600'
                                }`}>
                                  {rate.enabled ? __('On') : __('Off')}
                                </span>
                              </div>
                            </div>
                          </div>
                        </AccordionTrigger>
                        <AccordionContent className="px-4 pb-4">
                          {methodSettings[rate.instance_id] ? (
                            <div className="space-y-4 pt-2">
                              <div>
                                <label className="text-sm font-medium mb-2 block">
                                  {__('Display Name')}
                                </label>
                                <input
                                  className="w-full px-3 py-2 border rounded-md"
                                  defaultValue={methodSettings[rate.instance_id].settings?.title?.value || ''}
                                  id={`method-title-${rate.instance_id}`}
                                />
                                <p className="text-xs text-muted-foreground mt-1">
                                  {__('Name shown to customers at checkout')}
                                </p>
                              </div>

                              {methodSettings[rate.instance_id].settings?.cost && (
                                <div>
                                  <label className="text-sm font-medium mb-2 block">
                                    {methodSettings[rate.instance_id].settings.cost.title || __('Cost')}
                                  </label>
                                  <input
                                    className="w-full px-3 py-2 border rounded-md"
                                    defaultValue={methodSettings[rate.instance_id].settings.cost.value || ''}
                                    id={`method-cost-${rate.instance_id}`}
                                    placeholder={methodSettings[rate.instance_id].settings.cost.placeholder || '0'}
                                  />
                                  {methodSettings[rate.instance_id].settings.cost.description && (
                                    <p 
                                      className="text-xs text-muted-foreground mt-1"
                                      dangerouslySetInnerHTML={{ __html: methodSettings[rate.instance_id].settings.cost.description }}
                                    />
                                  )}
                                </div>
                              )}

                              {methodSettings[rate.instance_id].settings?.min_amount && (
                                <div>
                                  <label className="text-sm font-medium mb-2 block">
                                    {methodSettings[rate.instance_id].settings.min_amount.title || __('Minimum Order')}
                                  </label>
                                  <input
                                    className="w-full px-3 py-2 border rounded-md"
                                    defaultValue={methodSettings[rate.instance_id].settings.min_amount.value || ''}
                                    id={`method-min-amount-${rate.instance_id}`}
                                    placeholder={methodSettings[rate.instance_id].settings.min_amount.placeholder || '0'}
                                  />
                                  {methodSettings[rate.instance_id].settings.min_amount.description && (
                                    <p 
                                      className="text-xs text-muted-foreground mt-1"
                                      dangerouslySetInnerHTML={{ __html: methodSettings[rate.instance_id].settings.min_amount.description }}
                                    />
                                  )}
                                </div>
                              )}

                              <div className="flex justify-between gap-2 pt-2">
                                <Button
                                  variant="destructive"
                                  size="sm"
                                  onClick={() => {
                                    handleDeleteMethod(rate.instance_id, rate.title);
                                    setExpandedMethod('');
                                  }}
                                  disabled={deleteMethodMutation.isPending}
                                >
                                  <Trash2 className="h-4 w-4 mr-1" />
                                  {__('Remove')}
                                </Button>
                                <div className="flex gap-2">
                                  <Button
                                    variant="outline"
                                    size="sm"
                                    onClick={() => setExpandedMethod('')}
                                  >
                                    {__('Cancel')}
                                  </Button>
                                  <Button
                                    size="sm"
                                    onClick={() => {
                                      const settings: any = {};
                                      const titleInput = document.getElementById(`method-title-${rate.instance_id}`) as HTMLInputElement;
                                      const costInput = document.getElementById(`method-cost-${rate.instance_id}`) as HTMLInputElement;
                                      const minAmountInput = document.getElementById(`method-min-amount-${rate.instance_id}`) as HTMLInputElement;
                                      
                                      if (titleInput) settings.title = titleInput.value;
                                      if (costInput) settings.cost = costInput.value;
                                      if (minAmountInput) settings.min_amount = minAmountInput.value;
                                      
                                      updateSettingsMutation.mutate({
                                        zoneId: selectedZone.id,
                                        instanceId: rate.instance_id,
                                        settings
                                      });
                                    }}
                                    disabled={updateSettingsMutation.isPending}
                                  >
                                    {updateSettingsMutation.isPending ? __('Saving...') : __('Save')}
                                  </Button>
                                </div>
                              </div>
                            </div>
                          ) : (
                            <div className="flex items-center justify-center py-4">
                              <Loader2 className="h-5 w-5 animate-spin text-muted-foreground" />
                            </div>
                          )}
                        </AccordionContent>
                      </AccordionItem>
                    ))}
                  </Accordion>
                </div>
              </div>
              <div className="px-6 py-4 border-t flex justify-between gap-3">
                <Button
                  variant="outline"
                  asChild
                >
                  <a href={`${wcAdminUrl}/admin.php?page=wc-settings&tab=shipping&zone_id=${selectedZone.id}`} target="_blank" rel="noopener noreferrer">
                    <ExternalLink className="h-4 w-4 mr-2" />
                    {__('Edit in WooCommerce')}
                  </a>
                </Button>
                <Button onClick={() => setSelectedZone(null)}>
                  {__('Done')}
                </Button>
              </div>
            </DialogContent>
          </Dialog>
        ) : (
          <Drawer open={!!selectedZone} onOpenChange={(open) => !open && setSelectedZone(null)}>
            <DrawerContent className="max-h-[90vh] flex flex-col">
              <DrawerHeader className="border-b">
                <DrawerTitle>{selectedZone.name}</DrawerTitle>
                <p className="text-sm text-muted-foreground mt-1">
                  {selectedZone.regions}
                </p>
              </DrawerHeader>
              <div className="flex-1 overflow-y-auto px-4 py-4 min-h-0">
                <div className="space-y-3">
                  {/* Add Delivery Option Button */}
                  {!showAvailableMethods ? (
                    <Button
                      variant="outline"
                      className="w-full"
                      onClick={() => setShowAvailableMethods(true)}
                    >
                      <Plus className="h-4 w-4 mr-2" />
                      {__('Add Delivery Option')}
                    </Button>
                  ) : (
                    <div className="border rounded-lg p-3 space-y-2">
                      <div className="flex items-center justify-between mb-2">
                        <h3 className="font-medium text-sm">{__('Available Delivery Options')}</h3>
                        <Button
                          variant="ghost"
                          size="sm"
                          onClick={() => setShowAvailableMethods(false)}
                        >
                          <X className="h-3 w-3" />
                        </Button>
                      </div>
                      {availableMethods.map((method: any) => (
                        <button
                          key={method.id}
                          onClick={() => {
                            handleAddMethod(method.id);
                            setShowAvailableMethods(false);
                          }}
                          disabled={addMethodMutation.isPending}
                          className="w-full text-left p-2 border rounded-lg hover:border-primary hover:bg-accent transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
                        >
                          <div className="font-medium text-xs">{method.title}</div>
                          {method.description && (
                            <div className="text-[10px] text-muted-foreground mt-0.5">
                              {method.description}
                            </div>
                          )}
                        </button>
                      ))}
                    </div>
                  )}

                  {/* Delivery Options Accordion (Mobile) */}
                  <Accordion type="single" collapsible value={expandedMethod} onValueChange={(value) => {
                    setExpandedMethod(value);
                    if (value) {
                      const instanceId = parseInt(value);
                      fetchMethodSettings(instanceId);
                    }
                  }}>
                    {selectedZone.rates?.map((rate: any) => (
                      <AccordionItem key={rate.id} value={String(rate.instance_id)} className="border rounded-lg mb-2">
                        <AccordionTrigger className="hover:no-underline px-3 py-2">
                          <div className="flex items-center gap-2 flex-1 min-w-0">
                            <div className={`p-1.5 rounded-lg flex-shrink-0 ${rate.enabled ? 'bg-green-500/20 text-green-500' : 'bg-primary/10 text-primary'}`}>
                              <Truck className="h-3.5 w-3.5" />
                            </div>
                            <div className="flex-1 text-left min-w-0">
                              <div className="font-medium text-sm line-clamp-1" dangerouslySetInnerHTML={{ __html: rate.name }} />
                              <div className="flex items-center gap-2 text-xs text-muted-foreground mt-0.5">
                                <span className="font-semibold" dangerouslySetInnerHTML={{ __html: rate.price }} />
                                <span className={`px-1.5 py-0.5 rounded-full whitespace-nowrap ${
                                  rate.enabled 
                                    ? 'bg-green-100 text-green-700' 
                                    : 'bg-gray-100 text-gray-600'
                                }`}>
                                  {rate.enabled ? __('On') : __('Off')}
                                </span>
                              </div>
                            </div>
                          </div>
                        </AccordionTrigger>
                        <AccordionContent className="px-3 pb-3">
                          {methodSettings[rate.instance_id] ? (
                            <div className="space-y-3 pt-2">
                              <div>
                                <label className="text-xs font-medium mb-1.5 block">
                                  {__('Display Name')}
                                </label>
                                <input
                                  className="w-full px-2.5 py-1.5 text-sm border rounded-md"
                                  defaultValue={methodSettings[rate.instance_id].settings?.title?.value || ''}
                                  id={`method-title-mobile-${rate.instance_id}`}
                                />
                              </div>

                              {methodSettings[rate.instance_id].settings?.cost && (
                                <div>
                                  <label className="text-xs font-medium mb-1.5 block">
                                    {methodSettings[rate.instance_id].settings.cost.title || __('Cost')}
                                  </label>
                                  <input
                                    className="w-full px-2.5 py-1.5 text-sm border rounded-md"
                                    defaultValue={methodSettings[rate.instance_id].settings.cost.value || ''}
                                    id={`method-cost-mobile-${rate.instance_id}`}
                                    placeholder={methodSettings[rate.instance_id].settings.cost.placeholder || '0'}
                                  />
                                  {methodSettings[rate.instance_id].settings.cost.description && (
                                    <p 
                                      className="text-xs text-muted-foreground mt-1"
                                      dangerouslySetInnerHTML={{ __html: methodSettings[rate.instance_id].settings.cost.description }}
                                    />
                                  )}
                                </div>
                              )}

                              {methodSettings[rate.instance_id].settings?.min_amount && (
                                <div>
                                  <label className="text-xs font-medium mb-1.5 block">
                                    {methodSettings[rate.instance_id].settings.min_amount.title || __('Minimum Order')}
                                  </label>
                                  <input
                                    className="w-full px-2.5 py-1.5 text-sm border rounded-md"
                                    defaultValue={methodSettings[rate.instance_id].settings.min_amount.value || ''}
                                    id={`method-min-amount-mobile-${rate.instance_id}`}
                                    placeholder={methodSettings[rate.instance_id].settings.min_amount.placeholder || '0'}
                                  />
                                </div>
                              )}

                              <div className="flex justify-between gap-2 pt-1">
                                <Button
                                  variant="destructive"
                                  size="sm"
                                  onClick={() => {
                                    handleDeleteMethod(rate.instance_id, rate.title);
                                    setExpandedMethod('');
                                  }}
                                  disabled={deleteMethodMutation.isPending}
                                >
                                  <Trash2 className="h-3 w-3 mr-1" />
                                  {__('Remove')}
                                </Button>
                                <div className="flex gap-2">
                                  <Button
                                    variant="outline"
                                    size="sm"
                                    onClick={() => setExpandedMethod('')}
                                  >
                                    {__('Cancel')}
                                  </Button>
                                  <Button
                                    size="sm"
                                    onClick={() => {
                                      const settings: any = {};
                                      const titleInput = document.getElementById(`method-title-mobile-${rate.instance_id}`) as HTMLInputElement;
                                      const costInput = document.getElementById(`method-cost-mobile-${rate.instance_id}`) as HTMLInputElement;
                                      const minAmountInput = document.getElementById(`method-min-amount-mobile-${rate.instance_id}`) as HTMLInputElement;
                                      
                                      if (titleInput) settings.title = titleInput.value;
                                      if (costInput) settings.cost = costInput.value;
                                      if (minAmountInput) settings.min_amount = minAmountInput.value;
                                      
                                      updateSettingsMutation.mutate({
                                        zoneId: selectedZone.id,
                                        instanceId: rate.instance_id,
                                        settings
                                      });
                                    }}
                                    disabled={updateSettingsMutation.isPending}
                                  >
                                    {updateSettingsMutation.isPending ? __('Saving...') : __('Save')}
                                  </Button>
                                </div>
                              </div>
                            </div>
                          ) : (
                            <div className="flex items-center justify-center py-3">
                              <Loader2 className="h-4 w-4 animate-spin text-muted-foreground" />
                            </div>
                          )}
                        </AccordionContent>
                      </AccordionItem>
                    ))}
                  </Accordion>
                </div>
              </div>
              <div className="px-4 py-4 border-t flex flex-col gap-2">
                <Button
                  variant="outline"
                  asChild
                  className="w-full"
                >
                  <a href={`${wcAdminUrl}/admin.php?page=wc-settings&tab=shipping&zone_id=${selectedZone.id}`} target="_blank" rel="noopener noreferrer">
                    <ExternalLink className="h-4 w-4 mr-2" />
                    {__('Edit in WooCommerce')}
                  </a>
                </Button>
                <Button onClick={() => setSelectedZone(null)} className="w-full">
                  {__('Done')}
                </Button>
              </div>
            </DrawerContent>
          </Drawer>
        )
      )}

      {/* Delete Method Confirmation Dialog */}
      <AlertDialog open={!!deletingMethod} onOpenChange={() => setDeletingMethod(null)}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{__('Delete Shipping Method?')}</AlertDialogTitle>
            <AlertDialogDescription>
              {__('Are you sure you want to delete')} <strong>{deletingMethod?.name}</strong>?
              {' '}{__('This action cannot be undone.')}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{__('Cancel')}</AlertDialogCancel>
            <AlertDialogAction
              onClick={confirmDelete}
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            >
              {__('Delete')}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>

      {/* Delete Zone Confirmation Dialog */}
      <AlertDialog open={!!deletingZone} onOpenChange={() => setDeletingZone(null)}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{__('Delete Shipping Zone?')}</AlertDialogTitle>
            <AlertDialogDescription>
              {__('Are you sure you want to delete')} <strong>{deletingZone?.name}</strong>?
              {' '}{__('All shipping methods in this zone will also be deleted. This action cannot be undone.')}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{__('Cancel')}</AlertDialogCancel>
            <AlertDialogAction
              onClick={() => {
                if (deletingZone) {
                  deleteZoneMutation.mutate(deletingZone.id);
                }
              }}
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            >
              {__('Delete Zone')}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>

      {/* Add/Edit Zone Dialog */}
      <Dialog open={showAddZone || !!editingZone} onOpenChange={(open) => {
        if (!open) {
          setShowAddZone(false);
          setEditingZone(null);
          setRegionSearch('');
        }
      }}>
        <DialogContent className="max-w-2xl max-h-[90vh] overflow-y-auto">
          <DialogHeader>
            <DialogTitle>{editingZone ? __('Edit Zone') : __('Add Shipping Zone')}</DialogTitle>
          </DialogHeader>
          <form onSubmit={(e) => {
            e.preventDefault();
            const formData = new FormData(e.currentTarget);
            const zoneName = formData.get('name') as string;
            const selectedRegions = formData.getAll('regions').map(code => {
              const location = availableLocations.find((l: any) => l.code === code);
              return location ? { code: location.code, type: location.type } : null;
            }).filter(Boolean);

            if (editingZone) {
              updateZoneMutation.mutate({
                zoneId: editingZone.id,
                name: zoneName,
                regions: selectedRegions,
              });
            } else {
              createZoneMutation.mutate({
                name: zoneName,
                regions: selectedRegions,
              });
            }
          }} className="space-y-4">
            <div>
              <label htmlFor="zone-name" className="text-sm font-medium block mb-2">
                {__('Zone Name')}
              </label>
              <input
                id="zone-name"
                name="name"
                required
                defaultValue={editingZone?.name || ''}
                placeholder={__('e.g., Domestic, International, Europe')}
                className="w-full px-3 py-2 border rounded-md"
              />
            </div>

            <div>
              <label className="text-sm font-medium block mb-2">
                {__('Regions')}
              </label>
              <p className="text-xs text-muted-foreground mb-3">
                {__('Select countries, states, or continents for this zone')}
              </p>
              
              {/* Search Filter */}
              <input
                placeholder={__('Search regions...')}
                value={regionSearch}
                onChange={(e) => setRegionSearch(e.target.value)}
                className="w-full px-3 py-2 border rounded-md mb-2"
              />
              
              <div className="border rounded-md max-h-[300px] overflow-y-auto">
                {availableLocations.length === 0 ? (
                  <div className="p-4 text-center text-sm text-muted-foreground">
                    {__('Loading locations...')}
                  </div>
                ) : (
                  <div className="divide-y">
                    {availableLocations
                      .filter((location: any) => 
                        location.label.toLowerCase().includes(regionSearch.toLowerCase())
                      )
                      .map((location: any) => (
                        <label
                          key={location.code}
                          className="flex items-center gap-3 p-3 hover:bg-accent cursor-pointer"
                        >
                          <input
                            type="checkbox"
                            name="regions"
                            value={location.code}
                            defaultChecked={editingZone?.locations?.some((l: any) => l.code === location.code)}
                            className="rounded"
                          />
                          <span className="text-sm">{location.label}</span>
                        </label>
                      ))}
                    {availableLocations.filter((location: any) => 
                      location.label.toLowerCase().includes(regionSearch.toLowerCase())
                    ).length === 0 && (
                      <div className="p-4 text-center text-sm text-muted-foreground">
                        {__('No regions found')}
                      </div>
                    )}
                  </div>
                )}
              </div>
            </div>

            <div className="flex justify-end gap-3 pt-4">
              <Button
                type="button"
                variant="outline"
                onClick={() => {
                  setShowAddZone(false);
                  setEditingZone(null);
                  setRegionSearch('');
                }}
              >
                {__('Cancel')}
              </Button>
              <Button
                type="submit"
                disabled={createZoneMutation.isPending || updateZoneMutation.isPending}
              >
                {(createZoneMutation.isPending || updateZoneMutation.isPending) && (
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                )}
                {editingZone ? __('Update Zone') : __('Create Zone')}
              </Button>
            </div>
          </form>
        </DialogContent>
      </Dialog>

    </SettingsLayout>
  );
}
