#!/usr/bin/python
# expects ckb-daemon to be running, but the ckb user interface (including the
# icon in the tray) to not be running.

import sys
import optparse
import select
import re

from rgbkbd.manager import KeyboardManager


class Controller(object):
    def __init__(self, keyboard=None):
        self.keyboards = {}

    def open_keyboard(self, device):
        self.keyboards[device] = KeyboardManager(device)

    def run(self):
        """Primary event loop"""
        try:
            main_notifier = open('/dev/input/ckb0/notify0', 'r')
        except IOError, error:
            sys.stderr.write("The ckb-daemon must be running before starting "
                "this application.\n")
            sys.stderr.flush()
            return

        key_event_re = re.compile('key (?P<state>[-+])(?P<key>.*)', re.M)

        for n in range(1,10):
            try:
                self.open_keyboard(device='/dev/input/ckb%s' % n)
                #sys.stderr.write("Keyboard %s found\n" % n) # DEBUG
            except Exception, error:
                pass
                #sys.stderr.write("Keyboard %s not found (%s)\n" % (n, error)) # DEBUG
            #sys.stderr.flush() # DEBUG

        notifiers = [main_notifier]
        notifiers.extend(x.notifier for x in self.keyboards.values())

        try:
            while True:
                read_events, write_events, err_events = \
                    select.select(notifiers, [], notifiers, self.tick_rate())
                if err_events:
                    print "Error events %s" % err_events
                for read_event in read_events:
                    if read_event == main_notifier:
                        event = main_notifier.readline()
                        # print "Event on ckb0/notify0: %s" % event # DEBUG
                        words = event.split()
                        if words[0] == 'device' and words[2] == 'added':
                            # print "connecting new keyboard" # DEBUG
                            new_kbd = words[-1]
                            self.open_keyboard(new_kbd)
                            notifiers.append(self.keyboards[new_kbd].notifier)
                        elif words[0] == 'device' and words[2] == 'removed':
                            kbd = words[-1]
                            old_keyboard_manager = self.keyboards[kbd]
                            del self.keyboards[kbd]
                            notifiers.remove(old_keyboard_manager.notifier)
                    else:
                        keyboard_manager_matched = [x for x in self.keyboards.values()
                            if x.notifier == read_event]
                        if keyboard_manager_matched:
                            # We could get an event on a keyboard at the same
                            # time we get a notification of its removal.
                            keyboard_manager = keyboard_manager_matched[0]

                            line = read_event.readline()
                            key_match = key_event_re.match(line)
                            if key_match:
                                keyboard_manager.key_event(**key_match.groupdict())
                        else:
                            print "Read event on %r does not match a keyboard" % read_event

                # Send tick events to all keyboard managers
                for keyboard_manager in self.keyboards.values():
                    keyboard_manager.current_mode().tick()
        except KeyboardInterrupt:
            # Exit cleanly on ^C
            pass
        finally:
            self.shutdown()
        return

    def tick_rate(self):
        """Calculate a tick rate to use to meet the requirements across all
        attached keyboards.
        """
        tick_rates = [km.current_mode().tick_rate for km in self.keyboards.values()]
        tick_rates = [x for x in tick_rates if x]
        if tick_rates:
            return min(tick_rates)
        return None

    def shutdown(self):
        for keyboard_manager in self.keyboards.values():
            keyboard_manager.shutdown()


def main(argv):
    """Run the keyboard manager"""
    parser = optparse.OptionParser("Usage: %s [options]" % argv[0])
    parser.add_option('-k', '--keyboard', type="int", default=1,
        help="Keyboard number to manipulate")

    (options, args) = parser.parse_args(argv[1:])

    manager = Controller()
    manager.run()
    return 0


if __name__ == '__main__':
    sys.exit(main(sys.argv))