# -*- coding: utf-8 -*-

'''Dummy driver.

Implements basic driver interface.

This is useful for debugging or when writing new driver.

'''

import logging

from tuikit.driver import Driver

class DriverDummy(Driver):

    '''Dummy driver class'''

    def __init__(self):

        '''Initialize instance attributes'''

        Driver.__init__(self)

        self.log = logging.getLogger('tuikit')

        self.size.w, self.size.h = 80, 25

    def start(self, mainfunc):

        '''Start driver and run mainfunc.'''

        mainfunc()

    ## input ##

    def getevents(self, timeout=None):

        '''Process input, return list of events.

        timeout -- float, in seconds

        This dummy implementation just returns 'q' and Escape key presses.

        '''

        events = [('keypress', None, 'q'), ('keypress', 'escape', None)]

        return events

    ## drawing ##

    def erase(self):

        '''Clear screen.'''

        self.log.info('DummyDriver.erase()')

    def putch(self, x, y, c):

        '''Output one unicode character to specified coordinates.'''

        if not self.clipstack.test(x, y):

            return

        self.log.info('DummyDriver.putch(x=%r, y=%r, c=%r)', x, y, c)

    def commit(self):

        '''Commit changes to the screen.'''

        self.log.info('DummyDriver.commit()')

    ## colors ##

    def defcolor(self, name, desc):

        '''Define color name.

        Args:

            name: name of color (e.g. 'normal', 'active')

            desc: color description - foreground, background, attributes

                Format: '<fg> [on <bg>][, <attr>[, <attr> ...]]

                eg. 'white on black, bold'

        '''

        self.log.info('DummyDriver.defcolor(name=%r, desc=%r)', name, desc)

    def setcolor(self, name):

        """Set defined color.

        Previous color is forgotten.

        Color prefix is ignored.

        See pushcolor, popcolor for more advanced work with colors.

        """

        self.log.info('DummyDriver.setcolor(name=%r)', name)

    def pushcolor(self, name):

        '''Add color on top of stack and use this color for following output.'''

        self.log.info('DummyDriver.pushcolor(name=%r)', name)

    def popcolor(self):

        '''Remove color from top of stack and use new top color for following output.'''

        self.log.info('DummyDriver.popcolor()')

    ## cursor ##

    def showcursor(self, x, y):

        '''Set cursor to be shown at x, y coordinates.'''

        self.log.info('DummyDriver.showcursor(x=%r, y=%r)', x, y)

    def hidecursor(self):

        '''Hide cursor.'''

        self.log.info('DummyDriver.hidecursor()')

driverclass = DriverDummy