text: import axios from 'axios'
  import React, { useState, useEffect } from 'react'
  import { Link } from 'react-router-dom'
  import { Form, Button } from 'react-bootstrap'
  import { useDispatch, useSelector } from 'react-redux'
  import Message from '../components/Message'
  import Loader from '../components/Loader'
  import FormContainer from '../components/FormContainer'
  import { listProductDetails, updateProduct } from '../actions/productActions'
  import { PRODUCT_UPDATE_RESET } from '../constants/productConstants'
  
  const ProductEditScreen = ({ history, match }) => {
      const productId = match.params.id
  
      const [name, setName] = useState('')
      const [price, setPrice] = useState(0)
      const [image, setImage] = useState('')
      const [brand, setBrand] = useState('')
      const [category, setCategory] = useState('')
      const [countInStock, setCountInStock] = useState(0)
      const [description, setDescription] = useState('')
      const [uploading, setUploading] = useState(false)
  
      const dispatch = useDispatch()
  
      const productDetails = useSelector((state) => state.productDetails)
      const { loading, error, product } = productDetails
  
      const productUpdate = useSelector((state) => state.productUpdate)
      const { loading: loadingUpdate, error: errorUpdate, success: successUpdate } = productUpdate
  
      useEffect(() => {
          if (successUpdate) {
              dispatch({ type: PRODUCT_UPDATE_RESET })
              history.push('/admin/productlist')
          } else {
              if (!product.name || product._id !== productId) {
                  dispatch(listProductDetails(productId))
              } else {
                  setName(product.name)
                  setPrice(product.price)
                  setImage(product.image)
                  setBrand(product.brand)
                  setCategory(product.category)
                  setCountInStock(product.countInStock)
                  setDescription(product.description)
              }
          }
      }, [dispatch, history, product, productId, successUpdate])
  
      const uploadFileHandler = async (e) => {
          const file = e.target.files[0]
          const formData = new FormData()
          formData.append('image', file)
          setUploading(true)
  
          try {
              const config = {
                  headers: {
                      'Content-Type': 'multipart/form-data'
                  }
              }
  
              const { data } = await axios.post('/api/upload', formData, config)
  
              setImage(data)
              setUploading(false)
          } catch (error) {
              console.log(error)
              setUploading(false)
          }
      }
  
      const submitHandler = (e) => {
          e.preventDefault()
  
          dispatch(updateProduct({
              _id: productId,
              name,
              price,
              image,
              brand,
              category,
              description,
              countInStock
          }))
      }
  
      return (
          <>
              <Link to='/admin/productlist' className='btn btn-light my-3'>
                  Go Back
              </Link>
              <FormContainer>
                  <h1>Edit Product</h1>
                  {loadingUpdate && <Loader />}
                  {errorUpdate && <Message variant='danger'>{errorUpdate}</Message>}
                  {loading ? <Loader /> : error ?
                      <Message variant='danger'>{error}</Message>
                      : (
                          <Form onSubmit={submitHandler}>
                              <Form.Group controlId='name'>
                                  <Form.Label>Name</Form.Label>
                                  <Form.Control
                                      type='name'
                                      placeholder='Enter name'
                                      value={name}
                                      onChange={(e) => setName(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Form.Group controlId='price'>
                                  <Form.Label>Price</Form.Label>
                                  <Form.Control
                                      type='number'
                                      placeholder='Enter price'
                                      value={price}
                                      onChange={(e) => setPrice(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Form.Group controlId='image'>
                                  <Form.Label>Image</Form.Label>
                                  <Form.Control
                                      type='text'
                                      placeholder='Enter image url'
                                      value={image}
                                      onChange={(e) => setImage(e.target.value)}
                                  >
                                  </Form.Control>
                                  <Form.File
                                      id='image-file'
                                      label='Choose File'
                                      custom
                                      onChange={uploadFileHandler}
                                  >
                                  </Form.File>
                                  {uploading && <Loader />}
                              </Form.Group>
  
                              <Form.Group controlId='brand'>
                                  <Form.Label>Brand</Form.Label>
                                  <Form.Control
                                      type='text'
                                      placeholder='Enter brand'
                                      value={brand}
                                      onChange={(e) => setBrand(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Form.Group controlId='countInStock'>
                                  <Form.Label>CountInStock</Form.Label>
                                  <Form.Control
                                      type='number'
                                      placeholder='Enter CountInStock'
                                      value={countInStock}
                                      onChange={(e) => setCountInStock(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Form.Group controlId='category'>
                                  <Form.Label>Category</Form.Label>
                                  <Form.Control
                                      type='text'
                                      placeholder='Enter Category'
                                      value={category}
                                      onChange={(e) => setCategory(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Form.Group controlId='description'>
                                  <Form.Label>Description</Form.Label>
                                  <Form.Control
                                      type='text'
                                      placeholder='Enter Description'
                                      value={description}
                                      onChange={(e) => setDescription(e.target.value)}
                                  >
                                  </Form.Control>
                              </Form.Group>
  
                              <Button
                                  type='submit'
                                  variant='primary'
                              >
                                  Update
                              </Button>
                          </Form>
                      )}
              </FormContainer>
          </>
      )
  }
  
  export default ProductEditScreen
  