from twisted.web import resource

from DB import Database
from reximemo import dsi_url, make_menu, page_number, pagination_buttons


class PyResource(resource.Resource):
    isLeaf = True

    def render_GET(self, request):
        channels = Database.list_channels()
        page = page_number(request, len(channels), 25)
        buttons = [{"label": channel["title"], "url": dsi_url(request, f"ch/{channel['id']}.uls"), "icon": 101}
                   for channel in channels[(page - 1) * 25:page * 25]]
        pager = pagination_buttons(request, "channels.uls", page, len(channels), 25)
        before = [button for button in pager if button["label"].startswith("Previous")]
        after = [button for button in pager if button["label"].startswith("Next")]
        request.setHeader(b"content-type", b"text/plain")
        return make_menu(layout=(2, 1), title="Channels", subtitle_bottom="Choose a channel to browse or post.",
                         left="Channels", right=str(len(channels)), buttons=before + buttons + after)