"use client"

import { useState, useRef } from 'react'
import { useMutation, useQuery } from '@apollo/client'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { Card } from '@/components/ui/card'
import { CREATE_PRODUCT, UPDATE_PRODUCT } from '@/graphql/mutations'
import { GET_CATEGORIES } from '@/graphql/queries'
import { Upload, X, Star, Plus, Image as ImageIcon } from 'lucide-react'
import { toast } from 'sonner'

interface Product {
  id: string
  name: string
  article: string
  description: string
  price: number
  quantity: number
  category: { id: string; name: string } | null
  brand: string
  color: string
  size: string
  weight: number
  dimensions: string
  material: string
  images: string[]
  mainImage: string
  isActive: boolean
}

interface ProductFormProps {
  product?: Product | null
  onSave: () => void
  onCancel: () => void
}

export function ProductForm({ product, onSave, onCancel }: ProductFormProps) {
  const [formData, setFormData] = useState({
    name: product?.name || '',
    article: product?.article || '',
    description: product?.description || '',
    price: product?.price || 0,
    quantity: product?.quantity || 0,
    categoryId: product?.category?.id || 'none',
    brand: product?.brand || '',
    color: product?.color || '',
    size: product?.size || '',
    weight: product?.weight || 0,
    dimensions: product?.dimensions || '',
    material: product?.material || '',
    images: product?.images || [],
    mainImage: product?.mainImage || '',
    isActive: product?.isActive ?? true
  })

  const [isUploading, setIsUploading] = useState(false)
  const [uploadingImages, setUploadingImages] = useState<Set<number>>(new Set())
  const fileInputRef = useRef<HTMLInputElement>(null)

  const [createProduct, { loading: creating }] = useMutation(CREATE_PRODUCT)
  const [updateProduct, { loading: updating }] = useMutation(UPDATE_PRODUCT)
  
  // Загружаем категории
  const { data: categoriesData } = useQuery(GET_CATEGORIES)

  const loading = creating || updating

  const handleInputChange = (field: string, value: string | number | boolean) => {
    setFormData(prev => ({
      ...prev,
      [field]: value
    }))
  }

  const handleImageUpload = async (files: FileList) => {
    const newUploadingIndexes = new Set<number>()
    const startIndex = formData.images.length

    // Добавляем плейсхолдеры для загружаемых изображений
    const placeholders = Array.from(files).map((_, index) => {
      newUploadingIndexes.add(startIndex + index)
      return '' // Пустой URL как плейсхолдер
    })

    setUploadingImages(prev => new Set([...prev, ...newUploadingIndexes]))
    setFormData(prev => ({
      ...prev,
      images: [...prev.images, ...placeholders]
    }))

    try {
      // Загружаем каждое изображение
      const uploadPromises = Array.from(files).map(async (file, index) => {
        const actualIndex = startIndex + index
        const formData = new FormData()
        formData.append('file', file)
        formData.append('type', 'product')

        const response = await fetch('/api/upload-file', {
          method: 'POST',
          body: formData
        })

        if (!response.ok) {
          throw new Error('Ошибка загрузки изображения')
        }

        const result = await response.json()
        return { index: actualIndex, url: result.fileUrl }
      })

      const results = await Promise.all(uploadPromises)

      // Обновляем URLs загруженных изображений
      setFormData(prev => {
        const newImages = [...prev.images]
        results.forEach(({ index, url }) => {
          newImages[index] = url
        })
        return {
          ...prev,
          images: newImages,
          mainImage: prev.mainImage || results[0]?.url || '' // Устанавливаем первое изображение как главное
        }
      })

      toast.success('Изображения успешно загружены')
    } catch (error) {
      console.error('Error uploading images:', error)
      toast.error('Ошибка загрузки изображений')
      
      // Удаляем неудачные плейсхолдеры
      setFormData(prev => ({
        ...prev,
        images: prev.images.slice(0, startIndex)
      }))
    } finally {
      // Убираем индикаторы загрузки
      setUploadingImages(prev => {
        const updated = new Set(prev)
        newUploadingIndexes.forEach(index => updated.delete(index))
        return updated
      })
    }
  }

  const handleRemoveImage = (indexToRemove: number) => {
    setFormData(prev => {
      const newImages = prev.images.filter((_, index) => index !== indexToRemove)
      const removedImageUrl = prev.images[indexToRemove]
      
      return {
        ...prev,
        images: newImages,
        mainImage: prev.mainImage === removedImageUrl ? (newImages[0] || '') : prev.mainImage
      }
    })
  }

  const handleSetMainImage = (imageUrl: string) => {
    setFormData(prev => ({
      ...prev,
      mainImage: imageUrl
    }))
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()

    if (!formData.name || !formData.article || formData.price <= 0) {
      toast.error('Пожалуйста, заполните все обязательные поля')
      return
    }

    try {
      const input = {
        name: formData.name,
        article: formData.article,
        description: formData.description || undefined,
        price: formData.price,
        quantity: formData.quantity,
        categoryId: formData.categoryId && formData.categoryId !== 'none' ? formData.categoryId : undefined,
        brand: formData.brand || undefined,
        color: formData.color || undefined,
        size: formData.size || undefined,
        weight: formData.weight || undefined,
        dimensions: formData.dimensions || undefined,
        material: formData.material || undefined,
        images: formData.images.filter(img => img), // Убираем пустые строки
        mainImage: formData.mainImage || undefined,
        isActive: formData.isActive
      }

      if (product) {
        await updateProduct({
          variables: { id: product.id, input }
        })
        toast.success('Товар успешно обновлен')
      } else {
        await createProduct({
          variables: { input }
        })
        toast.success('Товар успешно создан')
      }

      onSave()
    } catch (error: unknown) {
      console.error('Error saving product:', error)
      toast.error((error as Error).message || 'Ошибка при сохранении товара')
    }
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-6">
      {/* Основная информация */}
      <Card className="bg-white/5 backdrop-blur border-white/10 p-4">
        <h3 className="text-white font-medium mb-4">Основная информация</h3>
        <div className="grid grid-cols-2 gap-4">
          <div>
            <Label className="text-white/80 text-sm mb-2 block">
              Название товара <span className="text-red-400">*</span>
            </Label>
            <Input
              value={formData.name}
              onChange={(e) => handleInputChange('name', e.target.value)}
              placeholder="iPhone 15 Pro Max"
              className="glass-input text-white placeholder:text-white/40 h-10"
              required
            />
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">
              Артикул <span className="text-red-400">*</span>
            </Label>
            <Input
              value={formData.article}
              onChange={(e) => handleInputChange('article', e.target.value)}
              placeholder="IP15PM-256-BLU"
              className="glass-input text-white placeholder:text-white/40 h-10"
              required
            />
          </div>
        </div>

        <div className="mt-4">
          <Label className="text-white/80 text-sm mb-2 block">Описание</Label>
          <textarea
            value={formData.description}
            onChange={(e) => handleInputChange('description', e.target.value)}
            placeholder="Подробное описание товара..."
            className="glass-input text-white placeholder:text-white/40 w-full resize-none"
            rows={3}
          />
        </div>

        <div className="grid grid-cols-2 gap-4 mt-4">
          <div>
            <Label className="text-white/80 text-sm mb-2 block">
              Цена (₽) <span className="text-red-400">*</span>
            </Label>
            <Input
              type="number"
              step="0.01"
              min="0"
              value={formData.price || ''}
              onChange={(e) => handleInputChange('price', parseFloat(e.target.value) || 0)}
              placeholder="99999.99"
              className="glass-input text-white placeholder:text-white/40 h-10"
              required
            />
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Количество</Label>
            <Input
              type="number"
              min="0"
              value={formData.quantity || ''}
              onChange={(e) => handleInputChange('quantity', parseInt(e.target.value) || 0)}
              placeholder="100"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
        </div>
      </Card>

      {/* Категоризация */}
      <Card className="bg-white/5 backdrop-blur border-white/10 p-4">
        <h3 className="text-white font-medium mb-4">Категоризация</h3>
        <div className="grid grid-cols-2 gap-4">
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Категория</Label>
            <Select
              value={formData.categoryId}
              onValueChange={(value) => handleInputChange('categoryId', value)}
            >
              <SelectTrigger className="glass-input text-white h-10">
                <SelectValue placeholder="Выберите категорию" />
              </SelectTrigger>
              <SelectContent className="glass-card">
                <SelectItem value="none">Без категории</SelectItem>
                {categoriesData?.categories?.map((category: { id: string; name: string }) => (
                  <SelectItem key={category.id} value={category.id} className="text-white">
                    {category.name}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Бренд</Label>
            <Input
              value={formData.brand}
              onChange={(e) => handleInputChange('brand', e.target.value)}
              placeholder="Apple"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
        </div>
      </Card>

      {/* Характеристики */}
      <Card className="bg-white/5 backdrop-blur border-white/10 p-4">
        <h3 className="text-white font-medium mb-4">Характеристики</h3>
        <div className="grid grid-cols-2 gap-4">
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Цвет</Label>
            <Input
              value={formData.color}
              onChange={(e) => handleInputChange('color', e.target.value)}
              placeholder="Синий"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Размер</Label>
            <Input
              value={formData.size}
              onChange={(e) => handleInputChange('size', e.target.value)}
              placeholder="L, XL, 42"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Вес (кг)</Label>
            <Input
              type="number"
              step="0.001"
              min="0"
              value={formData.weight || ''}
              onChange={(e) => handleInputChange('weight', parseFloat(e.target.value) || 0)}
              placeholder="0.221"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
          
          <div>
            <Label className="text-white/80 text-sm mb-2 block">Габариты</Label>
            <Input
              value={formData.dimensions}
              onChange={(e) => handleInputChange('dimensions', e.target.value)}
              placeholder="159.9 × 76.7 × 8.25 мм"
              className="glass-input text-white placeholder:text-white/40 h-10"
            />
          </div>
        </div>

        <div className="mt-4">
          <Label className="text-white/80 text-sm mb-2 block">Материал</Label>
          <Input
            value={formData.material}
            onChange={(e) => handleInputChange('material', e.target.value)}
            placeholder="Титан, стекло"
            className="glass-input text-white placeholder:text-white/40 h-10"
          />
        </div>
      </Card>

      {/* Изображения */}
      <Card className="bg-white/5 backdrop-blur border-white/10 p-4">
        <h3 className="text-white font-medium mb-4">Изображения товара</h3>
        
        {/* Кнопка загрузки */}
        <div className="mb-4">
          <input
            ref={fileInputRef}
            type="file"
            accept="image/*"
            multiple
            onChange={(e) => e.target.files && handleImageUpload(e.target.files)}
            className="hidden"
          />
          <Button
            type="button"
            variant="outline"
            onClick={() => fileInputRef.current?.click()}
            disabled={isUploading}
            className="glass-secondary text-white hover:text-white cursor-pointer"
          >
            <Upload className="h-4 w-4 mr-2" />
            {isUploading ? 'Загрузка...' : 'Добавить изображения'}
          </Button>
        </div>

        {/* Галерея изображений */}
        {formData.images.length > 0 && (
          <div className="grid grid-cols-3 gap-4">
            {formData.images.map((imageUrl, index) => (
              <div key={index} className="relative group">
                {uploadingImages.has(index) ? (
                  <div className="aspect-square bg-white/10 rounded-lg flex items-center justify-center">
                    <div className="animate-spin rounded-full h-8 w-8 border-2 border-white border-t-transparent"></div>
                  </div>
                ) : (
                  <>
                    <img
                      src={imageUrl}
                      alt={`Товар ${index + 1}`}
                      className="w-full aspect-square object-cover rounded-lg"
                    />
                    
                    {/* Индикатор главного изображения */}
                    {formData.mainImage === imageUrl && (
                      <div className="absolute top-2 left-2">
                        <Star className="h-5 w-5 text-yellow-400 fill-current" />
                      </div>
                    )}
                    
                    {/* Кнопки управления */}
                    <div className="absolute top-2 right-2 opacity-0 group-hover:opacity-100 transition-opacity flex gap-1">
                      {formData.mainImage !== imageUrl && (
                        <Button
                          type="button"
                          size="sm"
                          variant="outline"
                          onClick={() => handleSetMainImage(imageUrl)}
                          className="p-1 h-7 w-7 bg-white/20 border-white/30 hover:bg-white/30"
                        >
                          <Star className="h-3 w-3 text-white" />
                        </Button>
                      )}
                      <Button
                        type="button"
                        size="sm"
                        variant="outline"
                        onClick={() => handleRemoveImage(index)}
                        className="p-1 h-7 w-7 bg-red-500/20 border-red-400/30 hover:bg-red-500/30"
                      >
                        <X className="h-3 w-3 text-white" />
                      </Button>
                    </div>
                  </>
                )}
              </div>
            ))}
          </div>
        )}
      </Card>

      {/* Кнопки управления */}
      <div className="flex gap-3 pt-4">
        <Button
          type="button"
          variant="outline"
          onClick={onCancel}
          className="flex-1 border-purple-400/30 text-purple-200 hover:bg-purple-500/10 hover:border-purple-300 transition-all duration-300"
        >
          Отмена
        </Button>
        <Button
          type="submit"
          disabled={loading || isUploading}
          className="flex-1 bg-gradient-to-r from-purple-600 to-pink-600 hover:from-purple-500 hover:to-pink-500 text-white border-0 shadow-lg shadow-purple-500/25 hover:shadow-purple-500/40 transition-all duration-300"
        >
          {loading ? 'Сохранение...' : (product ? 'Сохранить изменения' : 'Создать товар')}
        </Button>
      </div>
    </form>
  )
}