#!/usr/bin/python
# Terminator by Chris Jones <cmsj@tenshu.net>
# GPL v2 only
"""terminator.py - class for the master Terminator singleton"""

import gtk

from borg import Borg
from config import Config
from keybindings import Keybindings
from util import dbg, err, get_top_window
import util

class Terminator(Borg):
    """master object for the application"""

    windows = None
    windowtitle = None
    terminals = None
    groups = None
    config = None
    keybindings = None

    groupsend = None
    groupsend_type = {'all':0, 'group':1, 'off':2}

    def __init__(self):
        """Class initialiser"""

        Borg.__init__(self, self.__class__.__name__)
        self.prepare_attributes()

    def prepare_attributes(self):
        """Initialise anything that isn't already"""

        if not self.windows:
            self.windows = []
        if not self.terminals:
            self.terminals = []
        if not self.groups:
            self.groups = []
        if not self.groupsend:
            self.groupsend = self.groupsend_type['group']
        if not self.config:
            self.config = Config()
        if not self.keybindings:
            self.keybindings = Keybindings()
            self.keybindings.configure(self.config['keybindings'])

    def register_window(self, window):
        """Register a new window widget"""
        if window not in self.windows:
            dbg('Terminator::register_window: registering %s:%s' % (id(window),
                type(window)))
            self.windows.append(window)

    def deregister_window(self, window):
        """de-register a window widget"""
        dbg('Terminator::deregister_window: de-registering %s:%s' %
                (id(window), type(window)))
        self.windows.remove(window)
        if len(self.windows) == 0:
            # We have no windows left, we should exit
            gtk.main_quit()

    def register_terminal(self, terminal):
        """Register a new terminal widget"""
        if terminal not in self.terminals:
            dbg('Terminator::register_terminal: registering %s:%s' %
                    (id(terminal), type(terminal)))
            self.terminals.append(terminal)
            terminal.connect('ungroup-all', self.ungroup_all)
            terminal.connect('navigate', self.navigate_terminal)
            terminal.connect('tab-new', self.tab_new)

    def deregister_terminal(self, terminal):
        """De-register a terminal widget"""
        dbg('Terminator::deregister_terminal: de-registering %s:%s' %
                (id(terminal), type(terminal)))
        self.terminals.remove(terminal)

        if len(self.terminals) == 0:
            for window in self.windows:
                window.destroy()
        else:
            dbg('Terminator::deregister_terminal: %d terminals remain' %
                    len(self.terminals))

    def reconfigure(self):
        """Update configuration for the whole application"""

        if self.config['handle_size'] in xrange(0, 6):
            gtk.rc_parse_string("""style "terminator-paned-style" {
                GtkPaned::handle_size = %s }
                class "GtkPaned" style "terminator-paned-style" """ %
                self.config['handle_size'])
            gtk.rc_reset_styles(gtk.settings_get_default())

        # Cause all the terminals to reconfigure
        for terminal in self.terminals:
            terminal.reconfigure()

    def tab_new(self, terminal):
        """A terminal asked for a new tab. This function is an indirection
        to the Window object"""
        window = get_top_window(terminal)
        window.tab_new()

    def navigate_terminal(self, terminal, direction):
        """Nagivate around the terminals"""
        current = self.terminals.index(terminal)
        length = len(self.terminals)
        next = None

        if length <= 1:
            return

        if direction == 'next':
            next = current + 1
            if next >= length:
                next = 0
        elif direction == 'prev':
            next = current - 1
            if next < 0:
                next = length - 1
        elif direction in ['left', 'right', 'up', 'down']:
            window = get_top_window(terminal)
            layout = window.get_visible_terminals()

            allocation = terminal.get_allocation()
            possibles = []

            # Get the co-ordinate of the appropriate edge for this direction
            edge = util.get_edge(allocation, direction)
            # Find all visible terminals which are, in their entirity, in the
            # direction we want to move
            for term in layout:
                rect = layout[term]
                if util.get_nav_possible(edge, rect, direction):
                    possibles.append(term)

            if len(possibles) == 0:
                return

            # Find out how far away each of the possible terminals is, then
            # find the smallest distance. The winning terminals are all of
            # those who are that distance away.
            offsets = {}
            for term in possibles:
                rect = layout[term]
                offsets[term] = util.get_nav_offset(edge, rect, direction)
            keys = offsets.values()
            keys.sort()
            winners = [k for k, v in offsets.iteritems() if v == keys[0]]
            next = self.terminals.index(winners[0])

            if len(winners) > 1:
                # Break an n-way tie with the cursor position
                cursor_x, cursor_y = terminal.get_cursor_position()
                cursor_x = cursor_x + allocation.x
                cursor_y = cursor_y + allocation.y
                for term in winners:
                    rect = layout[term]
                    if util.get_nav_tiebreak(direction, cursor_x, cursor_y, rect):
                        next = self.terminals.index(term)
                        break;
        else:
            err('Unknown navigation direction: %s' % direction)
        
        if next is not None:
            self.terminals[next].grab_focus()

    def create_group(self, name):
        """Create a new group"""
        if name not in self.groups:
            dbg('Terminator::create_group: registering group %s' % name)
            self.groups.append(name)

    def ungroup_all(self, widget):
        """Remove all groups"""
        for terminal in self.terminals:
            terminal.set_group(None, None)
        self.groups = []

    def closegroupedterms(self, group):
        """Close all terminals in a group"""
        for terminal in self.terminals:
            if terminal.group == group:
                terminal.close()

    def group_hoover(self):
        """Clean out unused groups"""

        if self.config['autoclean_groups']:
            inuse = []
            todestroy = []

            for terminal in self.terminals:
                if terminal.group:
                    if not terminal.group in inuse:
                        inuse.append(terminal.group)

            for group in self.groups:
                if not group in inuse:
                    todestroy.append(group)

            dbg('Terminator::group_hoover: %d groups, hoovering %d' %
                    (len(self.groups), len(todestroy)))
            for group in todestroy:
                self.groups.remove(group)

    def group_emit(self, terminal, group, type, event):
        """Emit to each terminal in a group"""
        dbg('Terminator::group_emit: emitting a keystroke for group %s' %
                group)
        for term in self.terminals:
            if term != terminal and term.group == group:
                term.vte.emit(type, event)

    def all_emit(self, terminal, type, event):
        """Emit to all terminals"""
        for term in self.terminals:
            if term != terminal:
                term.vte.emit(type, event)

    def do_enumerate(self, widget, pad):
        """Insert the number of each terminal in a group, into that terminal"""
        if pad:
            numstr = '%0'+str(len(str(len(self.terminals))))+'d'
        else:
            numstr = '%d'

        for term in self.get_target_terms(widget):
            idx = self.terminals.index(term)
            term.feed(numstr % (idx + 1))

    def get_target_terms(self, widget):
        """Get the terminals we should currently be broadcasting to"""
        if self.groupsend == self.groupsend_type['all']:
            return(self.terminals)
        elif self.groupsend == self.groupsend_type['group']:
            termset = []
            for term in self.terminals:
                if term == widget or (term.group != None and term.group ==
                        widget.group):
                    termset.append(term)
            return(termset)
        else:
            return([widget])

    def group_tab(self, widget):
        """Group all the terminals in a tab"""
        pass

    def ungroup_tab(self, widget):
        """Ungroup all the terminals in a tab"""
        pass

    def focus_changed(self, widget):
        """We just moved focus to a new terminal"""
        for terminal in self.terminals:
            terminal.titlebar.update(widget)
        return
# vim: set expandtab ts=4 sw=4: