# -*- coding: utf-8 -*-
#
# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.


# DESCRIPTION :
#
# Intended for use during manufacturing to validate that all keyboard
# keys function properly.  This program will display a keyboard image
# and keys will be highlighted as they are pressed and released.
# After the first key is hit, a countdown will begin.  If not all keys
# are used in time, the test will fail.


import cairo
import gobject
import gtk
import logging
import time
import os
import sys
import utils

import re
import subprocess

from gtk import gdk

from autotest_lib.client.bin import test
from autotest_lib.client.common_lib import error
from autotest_lib.client.cros import factory
from autotest_lib.client.cros.factory import ui as ful

# The keycodes from the GTK keyboard event have a +8 offset
# from the real one, hence the constant here
_GTK_KB_KEYCODE_OFFSET = 8

def GenerateKeycodeBinding(old_bindings):
    '''Offsets the bindings keycodes for GTK.'''
    key_to_geom = {}
    for item in old_bindings.items():
        key_to_geom[item[0] + _GTK_KB_KEYCODE_OFFSET] = item[1]
    return key_to_geom

class KeyboardTest:

    def __init__(self, kbd_image, bindings, scale):
        self._kbd_image = kbd_image
        self._bindings = bindings
        self._scale = scale
        self._pressed_keys = set()
        self._deadline = None
        self.successful_keys = set()

    def calc_missing_string(self):
        missing_keys = sorted((gdk.keyval_name(k) or '<0x%x>' % k)for k in
                              set(self._bindings) - self.successful_keys)
        if not missing_keys:
            return ''
        return ('Missing following keys\n' +
                '沒有偵測到下列按鍵，鍵盤可能故障，請檢修: %s' %
                ', '.join(missing_keys))

    def timer_event(self, countdown_label):
        if not self._deadline:   # Ignore timer with no countdown in progress.
            return True
        time_remaining = max(0, self._deadline - time.time())
        if time_remaining == 0:
            factory.log('deadline reached')
            gtk.main_quit()
        countdown_label.set_text('%d' % time_remaining)
        countdown_label.queue_draw()
        return True

    def expose_event(self, widget, event):
        context = widget.window.cairo_create()

        # Show keyboard image as the background.
        context.scale(self._scale, self._scale)
        context.set_source_surface(self._kbd_image, 0, 0)
        context.paint()

        for key in self.successful_keys:
            coords = self._bindings[key]
            context.rectangle(*coords)
            context.set_source_rgba(*ful.RGBA_GREEN_OVERLAY)
            context.fill()
        for key in self._pressed_keys:
            coords = self._bindings[key]
            context.rectangle(*coords)
            context.set_source_rgba(*ful.RGBA_YELLOW_OVERLAY)
            context.fill()

        return True

    def key_press_event(self, widget, event):
        if event.hardware_keycode in self.successful_keys:
            # Ignore keys already found to work successfully.
            return True
        if event.hardware_keycode not in self._bindings:
            factory.log('key (0x%x) ignored because not in bindings'
                        % event.keyval)
            return True

        self._pressed_keys.add(event.hardware_keycode)
        widget.queue_draw()

        # The first keypress starts test countdown.
        if self._deadline is None:
            self._deadline = int(time.time()) + ful.FAIL_TIMEOUT

        return True

    def key_release_event(self, widget, event):
        if event.hardware_keycode not in self._pressed_keys:
            # Ignore releases for keys not previously accepted as pressed.
            return False
        self._pressed_keys.remove(event.hardware_keycode)
        self.successful_keys.add(event.hardware_keycode)
        widget.queue_draw()
        if not self.calc_missing_string():
            factory.log('completed successfully')
            gtk.main_quit()
        return True

    def register_callbacks(self, window):
        window.connect('key-press-event', self.key_press_event)
        window.connect('key-release-event', self.key_release_event)
        window.add_events(gdk.KEY_PRESS_MASK | gdk.KEY_RELEASE_MASK)


class factory_Keyboard(test.test):
    version = 1
    preserve_srcdir = True

    def get_layout_from_vpd(self):
       """ vpd should contain
          "initial_locale"="en-US"
          "keyboard_layout"="xkb:us::eng"
       or similar. """
       cmd = 'vpd -l | grep initial_locale | cut -f4 -d\'"\''
       layout = utils.system_output(cmd).strip()
       if layout != '':
           return layout
       return None

    def run_once(self, layout=None):

        factory.log('%s run_once' % self.__class__)

        os.chdir(self.srcdir)

        # Autodetect from VPD.
        if not layout:
            layout = self.get_layout_from_vpd()
        # Default to United States.
        if not layout:
            layout = 'en-US'

        factory.log("Using keyboard layout %s" % layout)
        try:
            kbd_image = cairo.ImageSurface.create_from_png('%s.png' % layout)
            image_size = (kbd_image.get_width(), kbd_image.get_height())
        except cairo.Error as e:
            raise error.TestNAError('Error while opening %s.png: %s' %
                                    (layout, e.message))

        try:
            with open('%s.bindings' % layout, 'r') as file:
                bindings = eval(file.read())
                bindings = GenerateKeycodeBinding(bindings)
        except IOError as e:
            raise error.TestNAError('Error while opening %s: %s [Errno %d]' %
                                    (e.filename, e.strerror, e.errno))

        scale = ful.calc_scale(*image_size)

        test = KeyboardTest(kbd_image, bindings, scale)

        scaled_image_size = (image_size[0] * scale, image_size[1] * scale)

        drawing_area = gtk.DrawingArea()
        drawing_area.set_size_request(*scaled_image_size)
        drawing_area.connect('expose_event', test.expose_event)
        drawing_area.add_events(gdk.EXPOSURE_MASK)

        countdown_widget, countdown_label = ful.make_countdown_widget()
        gobject.timeout_add(1000, test.timer_event, countdown_label)

        test_widget = gtk.VBox()
        test_widget.set_spacing(20)
        test_widget.pack_start(drawing_area, False, False)
        test_widget.pack_start(countdown_widget, False, False)

        ful.run_test_widget(self.job, test_widget,
            window_registration_callback=test.register_callbacks)

        missing = test.calc_missing_string()
        if missing:
            raise error.TestFail(missing)

        factory.log('%s run_once finished' % self.__class__)