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from sqlalchemy.orm import  Query

class Pagination(object):
    """
     
    """
    def __init__(self, query, page, per_page, total, items):
        self.query = query
        self.page = page
        self.per_page = per_page
        self.total = total
        self.items = items

    @property
    def pages(self):
        if self.per_page == 0:
            pages = 0
        else:
            pages = int(ceil(self.total / float(self.per_page)))
        return pages

    def prev(self, error_out=False):
        assert self.query is not None, 'a query object is required ' \
                                       'for this method to work'
        return self.query.paginate(self.page - 1, self.per_page, error_out)

    @property
    def prev_num(self):
        if not self.has_prev:
            return None
        return self.page - 1

    @property
    def has_prev(self):
        return self.page > 1

    def next(self, error_out=False):
        assert self.query is not None, 'a query object is required ' \
                                       'for this method to work'
        return self.query.paginate(self.page + 1, self.per_page, error_out)

    @property
    def has_next(self):
        return self.page < self.pages

    @property
    def next_num(self):
        if not self.has_next:
            return None
        return self.page + 1

    def iter_pages(self, left_edge=2, left_current=2,
                   right_current=5, right_edge=2):
        last = 0
        for num in xrange(1, self.pages + 1):
            if num <= left_edge or \
               (num > self.page - left_current - 1 and \
                num < self.page + right_current) or \
               num > self.pages - right_edge:
                if last + 1 != num:
                    yield None
                yield num
                last = num


def paginate(self, page=None, per_page=None, error_out=True):
    """
     
    :param self:
    :param page:
    :param per_page:
    :param error_out:
    :return:
    """
    if request:
        if page is None:
            try:
                page = int(request.args.get('page', 1))
            except (TypeError, ValueError):
                if error_out:
                    abort(404)

                page = 1

        if per_page is None:
            try:
                per_page = int(request.args.get('per_page', 20))
            except (TypeError, ValueError):
                if error_out:
                    abort(404)

                per_page = 20
    else:
        if page is None:
            page = 1

        if per_page is None:
            per_page = 20

    if error_out and page < 1:
        abort(404)

    items = self.limit(per_page).offset((page - 1) * per_page).all()

    if not items and page != 1 and error_out:
        abort(404)

    if page == 1 and len(items) < per_page:
        total = len(items)
    else:
        total = self.order_by(None).count()

    return Pagination(self, page, per_page, total, items)



Query.paginate = paginate#