import scrapy
from scrapy_splash import LuaRequest


class BooksSpider(scrapy.Spider):
    name = 'books'
    allowed_domains = ['books.toscrape.com']

    def start_requests(self):
        yield LuaRequest(
            'http://books.toscrape.com/',
            lua_source="""
            splash:go(args.url)
            for i=1,50 do
               splash:css(".next a"):click()               
               splash:wait(1.0)
            end
            return splash:html() 
            """
        )

    def parse(self, response):
        for book in response.css('article.product_pod'):
            yield {
                'title': book.css('h3 a::text').get(),
                'url': book.css('h3 a::attr(href)').get(),
            }


class BooksSpider2(scrapy.Spider):
    name = 'books'
    allowed_domains = ['books.toscrape.com']

    def start_requests(self):
        yield LuaRequest(
            'http://books.toscrape.com/',
            lua_source="""
            splash:go(args.url)
            for i=1,50 do
               res={}
               splash:css(".next a"):click()               
               splash:wait(1.0)
               table.insert(res, splash:html())
            end
            return res
            """
        )

    def parse(self, response):
        for html in response.data:
            resp = TextResponse(response.url, body=html, encoding='utf8')
            yield from self.parse_page(resp)
                
    def parse_page(self, response):
        for book in response.css('article.product_pod'):
            yield {
                'title': book.css('h3 a::text').get(),
                'url': book.css('h3 a::attr(href)').get(),
            }
            
            
class BooksSpider3(scrapy.Spider):
    name = 'books'
    allowed_domains = ['books.toscrape.com']

    def start_requests(self):
        yield SuperLuaRequest(
            'http://books.toscrape.com/',
            lua_source="""
            splash:go(args.url)
            for i=1,50 do
               splash:css(".next a"):click()               
               splash:wait(1.0)
               splash:send(splash:html())
            end
            """
        )

    def parse(self, response):
        for book in response.css('article.product_pod'):
            yield {
                'title': book.css('h3 a::text').get(),
                'url': book.css('h3 a::attr(href)').get(),
            }