"""
Module defining the global info bar

This window is the one listing the current opened tabs in poezio.
The GlobalInfoBar can be either horizontal or vertical
(VerticalGlobalInfoBar).
"""
import logging
import itertools
log = logging.getLogger(__name__)

import curses

from poezio.config import config
from poezio.windows.base_wins import Win
from poezio.theming import get_theme, to_curses_attr
from poezio.common import unique_prefix_of


class GlobalInfoBar(Win):
    __slots__ = ('core')

    def __init__(self, core) -> None:
        Win.__init__(self)
        self.core = core

    def refresh(self) -> None:
        log.debug('Refresh: %s', self.__class__.__name__)
        self._win.erase()
        theme = get_theme()
        self.addstr(0, 0, "[",
                    to_curses_attr(theme.COLOR_INFORMATION_BAR))

        show_names = config.get('show_tab_names')
        show_nums = config.get('show_tab_numbers')
        use_nicks = config.get('use_tab_nicks')
        show_inactive = config.get('show_inactive_tabs')
        unique_prefix_tab_names = config.get('unique_prefix_tab_names')

        if unique_prefix_tab_names:
            unique_prefixes = [None] * len(self.core.tabs)
            sorted_tab_indices = sorted(
                (str(tab.name), i)
                for i, tab in enumerate(self.core.tabs)
            )
            prev_name = ""
            for (name, i), next_item in itertools.zip_longest(
                    sorted_tab_indices, sorted_tab_indices[1:]):
                # TODO: should this maybe use something smarter than .lower()?
                # something something stringprep?
                name = name.lower()
                prefix_prev = unique_prefix_of(name, prev_name)
                if next_item is not None:
                    prefix_next = unique_prefix_of(name, next_item[0].lower())
                else:
                    prefix_next = name[0]

                # to be unique, we have to use the longest prefix
                if len(prefix_next) > len(prefix_prev):
                    prefix = prefix_next
                else:
                    prefix = prefix_prev

                unique_prefixes[i] = prefix
                prev_name = name

        for nb, tab in enumerate(self.core.tabs):
            if not tab:
                continue
            color = tab.color
            if not show_inactive and color is theme.COLOR_TAB_NORMAL:
                continue
            try:
                if show_nums or not show_names:
                    self.addstr("%s" % str(nb), to_curses_attr(color))
                    if show_names:
                        self.addstr(' ', to_curses_attr(color))
                if show_names:
                    if unique_prefix_tab_names:
                        self.addstr(unique_prefixes[nb], to_curses_attr(color))
                    elif use_nicks:
                        self.addstr("%s" % str(tab.get_nick()),
                                    to_curses_attr(color))
                    else:
                        self.addstr("%s" % tab.name, to_curses_attr(color))
                self.addstr("|",
                            to_curses_attr(theme.COLOR_INFORMATION_BAR))
            except:  # end of line
                break
        (y, x) = self._win.getyx()
        self.addstr(y, x - 1, '] ',
                    to_curses_attr(theme.COLOR_INFORMATION_BAR))
        (y, x) = self._win.getyx()
        remaining_size = self.width - x
        self.addnstr(' ' * remaining_size, remaining_size,
                     to_curses_attr(theme.COLOR_INFORMATION_BAR))
        self._refresh()


class VerticalGlobalInfoBar(Win):
    __slots__ = ('core')

    def __init__(self, core, scr) -> None:
        Win.__init__(self)
        self.core = core
        self._win = scr

    def refresh(self) -> None:
        height, width = self._win.getmaxyx()
        self._win.erase()
        sorted_tabs = [tab for tab in self.core.tabs if tab]
        theme = get_theme()
        if not config.get('show_inactive_tabs'):
            sorted_tabs = [
                tab for tab in sorted_tabs
                if tab.vertical_color != theme.COLOR_VERTICAL_TAB_NORMAL
            ]
        nb_tabs = len(sorted_tabs)
        use_nicks = config.get('use_tab_nicks')
        if nb_tabs >= height:
            # TODO: As sorted_tabs filters out gap tabs this ensures pos is
            # always set, preventing UnboundLocalError. Now is this how this
            # should be fixed.
            pos = 0
            for y, tab in enumerate(sorted_tabs):
                if tab.vertical_color == theme.COLOR_VERTICAL_TAB_CURRENT:
                    pos = y
                    break
            # center the current tab as much as possible
            if pos < height // 2:
                sorted_tabs = sorted_tabs[:height]
            elif nb_tabs - pos <= height // 2:
                sorted_tabs = sorted_tabs[-height:]
            else:
                sorted_tabs = sorted_tabs[pos - height // 2:pos + height // 2]
        asc_sort = (config.get('vertical_tab_list_sort') == 'asc')
        for y, tab in enumerate(sorted_tabs):
            color = tab.vertical_color
            if asc_sort:
                y = height - y - 1
            self.addstr(y, 0, "%2d" % tab.nb,
                        to_curses_attr(theme.COLOR_VERTICAL_TAB_NUMBER))
            self.addstr('.')
            if use_nicks:
                self.addnstr("%s" % tab.get_nick(), width - 4,
                             to_curses_attr(color))
            else:
                self.addnstr("%s" % tab.name, width - 4, to_curses_attr(color))
        separator = to_curses_attr(theme.COLOR_VERTICAL_SEPARATOR)
        self._win.attron(separator)
        self._win.vline(0, width - 1, curses.ACS_VLINE, height)
        self._win.attroff(separator)
        self._refresh()