import scrapy
import sys
import logging
from scrapy_splash import SplashRequest
from scrapy_splash import SplashFormRequest
from scrapy.utils.response import open_in_browser
from scrapy.shell import inspect_response
from ..items import SdsItem
from scrapy.selector import Selector

logger = logging.getLogger('crawler_logger')


class FishersciSpider(scrapy.Spider):
    name = 'valvoline_search'
    allowed_domains = ['sds.valvoline.com']

    # TODO collect keywords from product listing or send them instead of iterating AAA AAB
    # TODO collect names which have already been collected
    custom_settings = {
        'HTTPCACHE_ENABLED': True,
        'DOWNLOADER_MIDDLEWARES': {
            # 'scrapy.downloadermiddlewares.retry.RetryMiddleware': 90,
            # 'scrapy_proxies.RandomProxy': 100,
            # 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware': 110,
            'scrapy_splash.SplashCookiesMiddleware': 723,
            'scrapy_splash.SplashMiddleware': 725,
            'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810
        },
        'LOG_LEVEL': 'DEBUG'
        # 'ITEM_PIPELINES': {
        #     'sds.pipelines.SDSValvolinePipelineCSV': 300
        # }
    }
    # os_version = sys.platform
    # if 'win32' == os_version:
    #     path_to_keywords = 'C:/Users/steph/PycharmProjects/safety_data_sheets/sds/valvoline_keywords.txt'
    # else:
    #     path_to_keywords = '/home/projects/sds/sds/valvoline_keywords.txt'
    #
    # with open(path_to_keywords) as f:
    #     keywords = f.readlines()
    keywords = ["Valvoline"]
    user_agent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36'

    def start_requests(self):
        # create session for requests for each keyword
        logger.info('keys {}'.format(len(self.keywords)))
        search_url = "https://sds.valvoline.com/"

        for keyword in self.keywords:
            # for reading from file
            keyword = keyword.strip(" \n")
            
            logger.info('searching by key: {}'.format(keyword))
            logger.info('first response to create session done, following up with FormRequest')
            yield SplashRequest(
                url=search_url
                , callback=self.parse
                , meta={'keyword': keyword}
                , dont_filter=True
            )

    def parse(self, response):
        # send request with a keyword
        keyword = response.meta['keyword']
        logger.info('extracted keyword from meta: {}'.format(keyword))

        javax_faces_view_state = response.xpath("//*[@id='javax.faces.ViewState']/@value").get()
        form_dict = {
            'materialSearch:j_id49': 'MaterialName',
            'materialSearch:j_id55': keyword,
            'materialSearch:j_id60': '0',
            'materialSearch:j_id66': 'O',
            'materialSearch:materialSearch': 'Submit',
            'materialSearch_SUBMIT': '1',
            'javax.faces.ViewState': javax_faces_view_state
        }
        # print(form_dict)
        yield SplashFormRequest.from_response(
            response,
            formdata=form_dict,
            callback=self.parse_form_request,
            meta={'keyword': keyword}
        )

    def parse_form_request(self, response):
        # if no error - for each file check if there are any options
        keyword = response.meta['keyword']

        error_message = response.xpath("//li[@class='errorMessage']/text()").get()
        if error_message is None:
            # inspect_response(response, self)
            # open_in_browser(response)
            form = response.xpath("//td[@class='width50Pct']/a/@onclick").getall()
            form.pop(0)  # first element for selector above is not needed
            form = [x[x.find("materialSearch:"):x.rfind("'")] for x in form]

            # yild only first response to limit the number of requests while code is not working
            for item in [form[0]]:

                javax_faces_view_state = response.xpath("//*[@id='javax.faces.ViewState']/@value").get()
                    # .replace("\n", "/").replace("==/", "==")

                form_dict = {
                    'materialSearch:j_id49': 'MaterialName',
                    'materialSearch:j_id55': keyword,
                    'materialSearch:j_id60': '0',
                    'materialSearch:j_id66': 'O',
                    'materialSearch_SUBMIT': '1',
                    'javax.faces.ViewState': javax_faces_view_state,
                    'materialSearch:_idcl':  item
                }

                # TODO not working properly (returns an error)
                yield SplashFormRequest.from_response(
                    response,
                    formdata=form_dict,
                    callback=self.parse_pdf_page,
                    meta={'keyword': keyword}
                )
        else:
            logger.info("empty response (no SDS found for keyword)")

    def parse_pdf_page(self, response):
        inspect_response(response, self)