import React, { useState } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { Plus, Pencil, Trash2, Search } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter, DialogDescription } from '@/components/ui/dialog';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { api } from '@/lib/api';
import { toast } from 'sonner';
import { __ } from '@/lib/i18n';

interface Attribute {
  attribute_id: number;
  attribute_name: string;
  attribute_label: string;
  attribute_type: string;
  attribute_orderby: string;
  attribute_public: number;
}

export default function ProductAttributes() {
  const queryClient = useQueryClient();
  const [search, setSearch] = useState('');
  const [dialogOpen, setDialogOpen] = useState(false);
  const [editingAttribute, setEditingAttribute] = useState<Attribute | null>(null);
  const [formData, setFormData] = useState({ 
    name: '', 
    label: '', 
    type: 'select',
    orderby: 'menu_order',
    public: 1
  });

  const { data: attributes = [], isLoading } = useQuery<Attribute[]>({
    queryKey: ['product-attributes'],
    queryFn: async () => {
      const response = await fetch(`${api.root()}/products/attributes`, {
        headers: { 'X-WP-Nonce': api.nonce() },
      });
      return response.json();
    },
  });

  const createMutation = useMutation({
    mutationFn: (data: any) => api.post('/products/attributes', data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['product-attributes'] });
      toast.success(__('Attribute created successfully'));
      handleCloseDialog();
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to create attribute'));
    },
  });

  const updateMutation = useMutation({
    mutationFn: ({ id, data }: { id: number; data: any }) => api.put(`/products/attributes/${id}`, data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['product-attributes'] });
      toast.success(__('Attribute updated successfully'));
      handleCloseDialog();
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to update attribute'));
    },
  });

  const deleteMutation = useMutation({
    mutationFn: (id: number) => api.del(`/products/attributes/${id}`),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['product-attributes'] });
      toast.success(__('Attribute deleted successfully'));
    },
    onError: (error: any) => {
      toast.error(error?.message || __('Failed to delete attribute'));
    },
  });

  const handleOpenDialog = (attribute?: Attribute) => {
    if (attribute) {
      setEditingAttribute(attribute);
      setFormData({
        name: attribute.attribute_name,
        label: attribute.attribute_label,
        type: attribute.attribute_type,
        orderby: attribute.attribute_orderby,
        public: attribute.attribute_public,
      });
    } else {
      setEditingAttribute(null);
      setFormData({ name: '', label: '', type: 'select', orderby: 'menu_order', public: 1 });
    }
    setDialogOpen(true);
  };

  const handleCloseDialog = () => {
    setDialogOpen(false);
    setEditingAttribute(null);
    setFormData({ name: '', label: '', type: 'select', orderby: 'menu_order', public: 1 });
  };

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (editingAttribute) {
      updateMutation.mutate({ id: editingAttribute.attribute_id, data: formData });
    } else {
      createMutation.mutate(formData);
    }
  };

  const handleDelete = (id: number) => {
    if (confirm(__('Are you sure you want to delete this attribute?'))) {
      deleteMutation.mutate(id);
    }
  };

  const filteredAttributes = attributes.filter((attr) =>
    attr.attribute_label.toLowerCase().includes(search.toLowerCase()) ||
    attr.attribute_name.toLowerCase().includes(search.toLowerCase())
  );

  return (
    <div className="space-y-4">
      <div className="flex items-center justify-between">
        <h1 className="text-2xl font-bold">{__('Product Attributes')}</h1>
        <Button onClick={() => handleOpenDialog()}>
          <Plus className="w-4 h-4 mr-2" />
          {__('Add Attribute')}
        </Button>
      </div>

      <div className="flex items-center gap-2">
        <div className="relative flex-1 max-w-sm">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
          <Input
            placeholder={__('Search attributes...')}
            value={search}
            onChange={(e) => setSearch(e.target.value)}
            className="!pl-9"
          />
        </div>
      </div>

      {isLoading ? (
        <div className="text-center py-8">
          <p className="text-muted-foreground">{__('Loading attributes...')}</p>
        </div>
      ) : filteredAttributes.length === 0 ? (
        <div className="text-center py-8 border rounded-lg">
          <p className="text-muted-foreground">{__('No attributes found')}</p>
        </div>
      ) : (
        <div className="border rounded-lg">
          <table className="w-full">
            <thead className="bg-muted/50">
              <tr>
                <th className="text-left p-4 font-medium">{__('Name')}</th>
                <th className="text-left p-4 font-medium">{__('Slug')}</th>
                <th className="text-left p-4 font-medium">{__('Type')}</th>
                <th className="text-center p-4 font-medium">{__('Order By')}</th>
                <th className="text-right p-4 font-medium">{__('Actions')}</th>
              </tr>
            </thead>
            <tbody>
              {filteredAttributes.map((attribute, index) => (
                <tr key={attribute.attribute_id || `attribute-${index}`} className="border-t hover:bg-muted/30">
                  <td className="p-4 font-medium">{attribute.attribute_label}</td>
                  <td className="p-4 text-muted-foreground">{attribute.attribute_name}</td>
                  <td className="p-4 text-sm capitalize">{attribute.attribute_type}</td>
                  <td className="p-4 text-center text-sm">{attribute.attribute_orderby}</td>
                  <td className="p-4">
                    <div className="flex items-center justify-end gap-2">
                      <Button
                        variant="ghost"
                        size="sm"
                        onClick={() => handleOpenDialog(attribute)}
                      >
                        <Pencil className="w-4 h-4" />
                      </Button>
                      <Button
                        variant="ghost"
                        size="sm"
                        onClick={() => handleDelete(attribute.attribute_id)}
                      >
                        <Trash2 className="w-4 h-4" />
                      </Button>
                    </div>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}

      <Dialog open={dialogOpen} onOpenChange={setDialogOpen}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>
              {editingAttribute ? __('Edit Attribute') : __('Add Attribute')}
            </DialogTitle>
            <DialogDescription>
              {editingAttribute ? __('Update attribute information') : __('Create a new product attribute')}
            </DialogDescription>
          </DialogHeader>
          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <Label htmlFor="label">{__('Label')}</Label>
              <Input
                id="label"
                value={formData.label}
                onChange={(e) => setFormData({ ...formData, label: e.target.value })}
                placeholder={__('e.g., Color, Size')}
                required
              />
            </div>
            <div>
              <Label htmlFor="name">{__('Slug')}</Label>
              <Input
                id="name"
                value={formData.name}
                onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                placeholder={__('Leave empty to auto-generate')}
              />
            </div>
            <div>
              <Label htmlFor="type">{__('Type')}</Label>
              <Select value={formData.type} onValueChange={(value) => setFormData({ ...formData, type: value })}>
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="select">{__('Select')}</SelectItem>
                  <SelectItem value="text">{__('Text')}</SelectItem>
                </SelectContent>
              </Select>
            </div>
            <div>
              <Label htmlFor="orderby">{__('Default Sort Order')}</Label>
              <Select value={formData.orderby} onValueChange={(value) => setFormData({ ...formData, orderby: value })}>
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="menu_order">{__('Custom ordering')}</SelectItem>
                  <SelectItem value="name">{__('Name')}</SelectItem>
                  <SelectItem value="name_num">{__('Name (numeric)')}</SelectItem>
                  <SelectItem value="id">{__('Term ID')}</SelectItem>
                </SelectContent>
              </Select>
            </div>
            <DialogFooter>
              <Button type="button" variant="outline" onClick={handleCloseDialog}>
                {__('Cancel')}
              </Button>
              <Button type="submit" disabled={createMutation.isPending || updateMutation.isPending}>
                {editingAttribute ? __('Update') : __('Create')}
              </Button>
            </DialogFooter>
          </form>
        </DialogContent>
      </Dialog>
    </div>
  );
}