import scrapy


def join_clean_text(texts):
    return " ".join(text.strip() for text in texts if text.strip())


class EventsSpider(scrapy.Spider):
    name = "events"
    allowed_domains = ["events.example.net"]
    start_urls = ["https://events.example.net/calendar/"]

    def parse(self, response):
        for href in response.css("article.event-card a.event-link::attr(href)").getall():
            yield response.follow(href, callback=self.parse_event)

        next_href = response.css(
            "a[rel='next']::attr(href), a.next::attr(href)"
        ).get()
        if next_href:
            yield response.follow(next_href, callback=self.parse)

    def parse_event(self, response):
        registration_href = response.css(
            "a.register::attr(href), a[href*='register']::attr(href)"
        ).get()

        yield {
            "title": response.css("h1::text").get(default="").strip(),
            "start_time": response.css("time::attr(datetime)").get(default="").strip(),
            "location": response.css(".event-location::text").get(default="").strip(),
            "summary": join_clean_text(
                response.css(".event-summary *::text").getall()
            ),
            "registration_url": (
                response.urljoin(registration_href) if registration_href else ""
            ),
            "url": response.url,
        }