"""
A generic tab that displays a series of items in a scrollable, searchable,
sortable list.  It should be inherited, to actually provide methods that
insert items in the list, and that lets the user interact with them.
"""

import curses
import collections
import logging
from typing import Dict, Callable

from poezio import windows
from poezio.core.structs import Command
from poezio.decorators import refresh_wrapper
from poezio.tabs import Tab

log = logging.getLogger(__name__)


class ListTab(Tab):
    plugin_commands: Dict[str, Command] = {}
    plugin_keys: Dict[str, Callable] = {}

    def __init__(self, core, name, help_message, header_text, cols):
        """Parameters:
        name: The name of the tab
        help_message: The default help message displayed instead of the
        input
        header_text: The text displayed on the header line, at the top of
        the tab
        cols: a tuple of 2-tuples. e.g. (('column1_name', number),
                                         ('column2_name', number))
        """
        Tab.__init__(self, core)
        self.state = 'normal'
        self._error_message = ''
        self._name = name
        columns = collections.OrderedDict()
        for col, num in cols:
            columns[col] = num
        self.list_header = windows.ColumnHeaderWin(list(columns))
        self.listview = windows.ListWin(columns)
        self.info_header = windows.MucListInfoWin(header_text)
        self.default_help_message = windows.HelpText(help_message)
        self.input = self.default_help_message
        self.key_func["KEY_DOWN"] = self.move_cursor_down
        self.key_func["KEY_UP"] = self.move_cursor_up
        self.key_func['^I'] = self.completion
        self.key_func["/"] = self.on_slash
        self.key_func['KEY_LEFT'] = self.list_header.sel_column_left
        self.key_func['KEY_RIGHT'] = self.list_header.sel_column_right
        self.key_func[' '] = self.sort_by
        self.register_command('close', self.close, shortdesc='Close this tab.')
        self.resize()
        self.update_keys()
        self.update_commands()

    def get_columns_sizes(self):
        """
        Must be implemented in subclasses. Must return a dict like this:
        {'column1_name': size1,
         'column2_name': size2}
        Where the size are calculated based on the size of the tab etc
        """
        raise NotImplementedError

    def refresh(self):
        if self.need_resize:
            self.resize()
        log.debug('  TAB   Refresh: %s', self.__class__.__name__)
        if self.size.tab_degrade_y:
            display_info_win = False
        else:
            display_info_win = True

        self.info_header.refresh(window=self.listview)
        if display_info_win:
            self.info_win.refresh()
        self.refresh_tab_win()
        self.list_header.refresh()
        self.listview.refresh()
        self.input.refresh()

    def resize(self):
        if self.size.tab_degrade_y:
            info_win_height = 0
            tab_win_height = 0
        else:
            info_win_height = self.core.information_win_size
            tab_win_height = Tab.tab_win_height()

        self.info_header.resize(
            1, self.width, self.height - 2 - info_win_height - tab_win_height,
            0)
        column_size = self.get_columns_sizes()
        self.list_header.resize_columns(column_size)
        self.list_header.resize(1, self.width, 0, 0)
        self.listview.resize_columns(column_size)
        self.listview.resize(
            self.height - 3 - info_win_height - tab_win_height, self.width, 1,
            0)
        self.input.resize(1, self.width, self.height - 1, 0)

    def on_slash(self):
        """
        '/' is pressed, activate the input
        """
        curses.curs_set(1)
        self.input = windows.CommandInput("", self.reset_help_message,
                                          self.execute_slash_command)
        self.input.resize(1, self.width, self.height - 1, 0)
        self.input.do_command("/")  # we add the slash

    def close(self, arg=None):
        self.core.close_tab(self)

    def set_error(self, msg, code, body):
        """
        If there's an error (retrieving the values etc)
        """
        self._error_message = 'Error: %(code)s - %(msg)s: %(body)s' % {
            'msg': msg,
            'body': body,
            'code': code
        }
        self.info_header.message = self._error_message
        self.info_header.refresh()
        curses.doupdate()

    def sort_by(self):
        if self.list_header.get_order():
            self.listview.sort_by_column(
                col_name=self.list_header.get_sel_column(), asc=False)
            self.list_header.set_order(False)
            self.list_header.refresh()
        else:
            self.listview.sort_by_column(
                col_name=self.list_header.get_sel_column(), asc=True)
            self.list_header.set_order(True)
            self.list_header.refresh()
        self.core.doupdate()

    @refresh_wrapper.always
    def reset_help_message(self, _=None):
        if self.closed:
            return True
        curses.curs_set(0)
        self.input = self.default_help_message
        self.input.resize(1, self.width, self.height - 1, 0)
        return True

    def execute_slash_command(self, txt):
        if txt.startswith('/'):
            self.input.key_enter()
            self.execute_command(txt)
        return self.reset_help_message()

    def completion(self):
        if isinstance(self.input, windows.Input):
            self.complete_commands(self.input)

    def on_input(self, key, raw):
        res = self.input.do_command(key, raw=raw)
        if res:
            return not isinstance(self.input, windows.Input)
        if not raw and key in self.key_func:
            return self.key_func[key]()

    def on_info_win_size_changed(self):
        if self.core.information_win_size >= self.height - 3:
            return
        self.info_header.resize(
            1, self.width, self.height - 2 - self.core.information_win_size -
            Tab.tab_win_height(), 0)
        self.listview.resize(
            self.height - 3 - self.core.information_win_size -
            Tab.tab_win_height(), self.width, 1, 0)

    def on_lose_focus(self):
        self.state = 'normal'

    def on_gain_focus(self):
        self.state = 'current'
        curses.curs_set(0)

    def on_scroll_up(self):
        return self.listview.scroll_up()

    def on_scroll_down(self):
        return self.listview.scroll_down()

    def move_cursor_up(self):
        self.listview.move_cursor_up()
        self.listview.refresh()
        self.core.doupdate()

    def move_cursor_down(self):
        self.listview.move_cursor_down()
        self.listview.refresh()
        self.core.doupdate()

    def matching_names(self):
        return [(2, self.name)]
