"""UI elements for the npytabletracker application."""
import npyscreen

from npytabletracker.cmd import ManagementActionController
from npytabletracker.data import TableState


class CharacterList(npyscreen.MultiLineAction):
    """Display characters' initiative order and allow for operations on them."""

    def __init__(self, *args, **keywords):
        """Set up some extra handlers when selecting characters in the list."""
        super(CharacterList, self).__init__(*args, **keywords)
        self.add_handlers({
            ">": self.when_init_move_down,
            "<": self.when_init_move_up
        })

    def when_init_move_down(self, *args, **keywords):
        """Move the selected character down one spot in the initiative table."""
        if self.cursor_line < len(self.parent.value.characters) - 1:
            chars = self.parent.value.characters
            pos = self.cursor_line
            chars[pos], chars[pos+1] = chars[pos+1], chars[pos]
            self.parent.update_list()
            self.cursor_line += 1

    def when_init_move_up(self, *args, **keywords):
        """Move the selected character up one spot in the initiative table."""
        if self.cursor_line - 1 >= 0:
            chars = self.parent.value.characters
            pos = self.cursor_line
            chars[pos], chars[pos-1] = chars[pos-1], chars[pos]
            self.parent.update_list()
            self.cursor_line -= 1


class TableTrackerDisplay(npyscreen.FormMuttActiveTraditional):
    """Create the high level form, which is organized like mutt/irssi."""

    ACTION_CONTROLLER = ManagementActionController
    DATA_CONTROLER = TableState
    MAIN_WIDGET_CLASS = CharacterList

    def update_list(self):
        """Update data in the window and represent it."""
        self.wMain.display()