import urwid

from toot import api
from toot.exceptions import ApiError
from toot.utils import format_content
from .utils import highlight_hashtags, parse_datetime
from .widgets import Button, CheckBox, RadioButton


class Poll(urwid.ListBox):
    """View and vote on a poll"""

    def __init__(self, app, user, status):
        self.status = status
        self.app = app
        self.user = user
        self.poll = status.data.get("poll")
        self.button_group = []

        self.setup_listbox()

    def setup_listbox(self):
        actions = list(self.generate_contents(self.status))
        walker = urwid.SimpleListWalker(actions)
        super().__init__(walker)

    def build_linebox(self, contents):
        contents = urwid.Pile(list(contents))
        contents = urwid.Padding(contents, left=1, right=1)
        return urwid.LineBox(contents)

    def vote(self, button):
        poll = self.status.data.get("poll")
        choices = []
        for idx, b in enumerate(self.button_group):
            if b.get_state():
                choices.append(idx)

        if len(choices):
            try:
                response = api.vote(self.app, self.user, poll["id"], choices=choices)
                self.status.data["poll"] = response
                self.poll["voted"] = True
                self.poll["own_votes"] = choices
            except ApiError:
                pass  # FIXME error reporting?
            finally:
                self.setup_listbox()

    def generate_poll_detail(self, status):
        poll = self.poll

        if poll:
            self.button_group = []  # button group
            for idx, option in enumerate(poll["options"]):
                voted_for = (
                    poll["voted"] and poll["own_votes"] and idx in poll["own_votes"]
                )

                if poll["voted"] or poll["expired"]:
                    prefix = " ✓  " if voted_for else "    "
                    yield urwid.Text(("gray", prefix + f'{option["title"]}'))
                else:
                    if poll["multiple"]:
                        cb = CheckBox(f'{option["title"]}')
                        self.button_group.append(cb)
                        yield cb
                    else:
                        yield RadioButton(self.button_group, f'{option["title"]}')

            yield urwid.Divider()

            poll_detail = "Poll · {} votes".format(poll["votes_count"])

            if poll["expired"]:
                poll_detail += " · Closed"

            if poll["expires_at"]:
                expires_at = parse_datetime(poll["expires_at"]).strftime(
                    "%Y-%m-%d %H:%M"
                )
                poll_detail += " · Closes on {}".format(expires_at)

            yield urwid.Text(("gray", poll_detail))

    def generate_contents(self, status):
        yield urwid.Divider()
        for line in format_content(status.data["content"]):
            yield (urwid.Text(highlight_hashtags(line, set())))

        yield urwid.Divider()
        yield (self.build_linebox(self.generate_poll_detail(status)))
        yield urwid.Divider()

        if self.poll["voted"]:
            yield urwid.Text(("grey", "< Already Voted >"))
        elif not self.poll["expired"]:
            yield Button("Vote", on_press=self.vote)