import scrapy
import re
import sys

class AmazonScrapy(scrapy.Spider):

    name = "AmazonScraper"

    start_urls = ["https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=electronic+devices"]

    def parse_item(self,response):


        product_description = response.css("div #feature-bullets span.a-list-item::text").extract()
        price_whole = response.css("span#priceblock_ourprice::text").extract()
        original_price = response.css("div#unifiedPrice_feature_div span.a-text-strike::text").extract_first()
        product_name = response.css("span#productTitle::text").extract_first().strip()
        rating_temp = response.css("div#averageCustomerReviews i.a-icon-star span::text").extract_first()
        rating = rating_temp[:3]
        image_link = response.css("div#imgTagWrapperId img::attr(src)").extract()
        self.stripper(product_description)
        product_link = response.url

        if( price_whole is None):
            pass
        else:
            yield{
                'product_desc' : product_description,
                'product_name' : product_name,
                'current_price' : price_whole,
                'original_price' : original_price,
                'rating' : rating,
                'image_link' : image_link,
                'product_link' : product_link

            }

    def parse(self,response):
        for detail in response.css("div.s-item-container"):

            link = detail.css("a.s-access-detail-page::attr(href)").extract_first()

            if link is not None:
                yield scrapy.Request(link,callback=self.parse_item)




        next_page = response.css('a.pagnNext::attr(href)').extract_first()
        if next_page is not None:
            next_page = response.urljoin(next_page)
            yield scrapy.Request(next_page, callback=self.parse)




    def stripper(self,list_desc):
        for item in range(len(list_desc)):
            list_desc[item] = list_desc[item].strip()