# -*- coding: utf-8  -*-

from wiki.page import Page

class Category(Page):
    """
    EarwigBot's Wiki Toolset: Category Class

    Represents a Category on a given Site, a subclass of Page. Provides
    additional methods, but Page's own methods should work fine on Category
    objects. Site.get_page() will return a Category instead of a Page if the
    given title is in the category namespace; get_category() is shorthand,
    because it accepts category names without the namespace prefix.

    Public methods:
    members -- returns a list of page titles in the category
    """

    def __repr__(self):
        """Returns the canonical string representation of the Category."""
        res = "Category(title={0!r}, follow_redirects={1!r}, site={2!r})"
        return res.format(self._title, self._follow_redirects, self._site)

    def __str__(self):
        """Returns a nice string representation of the Category."""
        return '<Category "{0}" of {1}>'.format(self.title(), str(self._site))

    def members(self, limit=50, use_sql=False):
        """Returns a list of page titles in the category.

        If `limit` is provided, we will provide this many titles, or less if
        the category is too small. `limit` defaults to 50; normal users can go
        up to 500, and bots can go up to 5,000 on a single API query.

        If `use_sql` is True, we will use a SQL query instead of the API. The
        limit argument will be ignored, and pages will be returned as tuples
        of (title, pageid) instead of just titles.
        """
        if use_sql:
            query = """SELECT page_title, page_namespace, page_id FROM page
                       JOIN categorylinks ON page_id = cl_from
                       WHERE cl_to = ?"""
            title = self.title().replace(" ", "_").split(":", 1)[1]
            result = self._site.sql_query(query, (title,))
            members = []
            for row in result:
                body = row[0].replace("_", " ")
                namespace = self._site.namespace_id_to_name(row[1])
                if namespace:
                    title = ":".join((str(namespace), body))
                else:  # Avoid doing a silly (albeit valid) ":Pagename" thing
                    title = body
                members.append((title, row[2]))
            return members

        else:
            params = {"action": "query", "list": "categorymembers",
                "cmlimit": limit, "cmtitle": self._title}
            result = self._site._api_query(params)
            members = result['query']['categorymembers']
            return [member["title"] for member in members]