# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals

# useful for handling different item types with a single interface
from itemadapter import is_item, ItemAdapter

# from copy import deepcopy
# import regex

# class SplitByStreet:

#         @classmethod

#         # Une fonction qui sépare les adresses en fonction des noms de rue
#         def splitStreet(self, value):
#             # Le regex qui évalue là où il faut séparer la chaîne de caractère 
#             # (présence de "et / - + ainsi que" 
#             # sans que ce séparateur ne soit placé près d'un groupe de numéros de la même rue)
#             expr = r"((?<!(\d\sa)|(\d\sb)|(\d\sbis)|(\d\ster)|(\d)|(\da)|(\db)|(\dbis)|(\dter)|(\d\s)|(\da\s)|(\db\s)|(\dbis\s)|(\dter\s)|(\d\sa\s)|(\d\sb\s)|(\d\sbis\s)|(\d\ster\s))\/|((?<!(\d))\s\bet)|(ainsi\sque)|((?<!(\d))\s-\s(?!(bt)|(bis)|(ter)))|(?<!(\d\sa)|(\d\sb)|(\d\sbis)|(\d\ster)|(\d)|(\da)|(\db)|(\dbis)|(\dter)|(\d\s)|(\da\s)|(\db\s)|(\dbis\s)|(\dter\s)|(\d\sa\s)|(\d\sb\s)|(\d\sbis\s)|(\d\ster\s))\+)"
#             # Remplacement de chaque séparateur par un pipe ("|")
#             subst = "|"
#             repl = regex.sub(expr, subst, value, 0, regex.MULTILINE | regex.IGNORECASE)
#             # Formattage (supression des espaces insécables et des ":")
#             filtered = regex.sub('\\xa0|:', '', repl, 0, regex.MULTILINE | regex.IGNORECASE)
#             # Séparation en liste
#             splitted = regex.split('\|', filtered, regex.MULTILINE | regex.IGNORECASE)
#             # Suppression des espaces en début et fin de chaîne
#             stripped = [x.strip() for x in splitted]
#             # Suppression des "None" de la liste (failsafe, ne devrait pas être nécessaire)
#             value = list(filter(None, stripped))
#             return value

#         def process_spider_output(self, response, result, spider):
#             for r in result:
#                 adresses = r.pop("adrs")
#                 adresses = adresses[0]
#                 indiv = self.splitStreet(adresses)
#                 index = 0
#                 for i in indiv:
#                     d = {"adrs":indiv[index]}
#                     index += 1
#                     yield d



class PerilsSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class PerilsDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)
