# Copyright 2013 Daniel Narvaez
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import os
import time
import subprocess

from osbuild import utils


def start():
    xvfb_display = _find_free_display()
    xvfb_proc = subprocess.Popen(args=["Xvfb", xvfb_display],
                                 stdout=utils.devnull,
                                 stderr=subprocess.STDOUT)
    orig_display = os.environ.get("DISPLAY", None)
    os.environ["DISPLAY"] = xvfb_display

    tries = 30
    while not _try_display():
        time.sleep(1)
        if tries > 0:
            tries = tries - 1

    logging.error("Cannot access Xvfb display")

    return (xvfb_proc, orig_display)


def stop(xvfb_proc, orig_display):
    if orig_display is not None:
        os.environ["DISPLAY"] = orig_display

    xvfb_proc.terminate()


def _try_display(display):
    display_name = ":%s" % display
    result = subprocess.call(args=["xdpyinfo", "--display", display_name],
                             stdout=utils.devnull,
                             stderr=subprocess.STDOUT)
    return result == 0


def _find_free_display():
    for i in range(100, 1000):
        if not _try_display(i):
            return ":%s" % i

# Copyright 2013 Daniel Narvaez
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import os
import time
import subprocess

from osbuild import utils


def start():
    xvfb_display = _find_free_display()
    xvfb_proc = subprocess.Popen(args=["Xvfb", xvfb_display],
                                 stdout=utils.devnull,
                                 stderr=subprocess.STDOUT)
    orig_display = os.environ.get("DISPLAY", None)
    os.environ["DISPLAY"] = xvfb_display

    tries = 30
    while not _try_display(xvfb_display):
        time.sleep(1)
        if tries > 0:
            tries = tries - 1

    logging.error("Cannot access Xvfb display")

    return (xvfb_proc, orig_display)


def stop(xvfb_proc, orig_display):
    if orig_display is not None:
        os.environ["DISPLAY"] = orig_display

    xvfb_proc.terminate()


def _try_display(display):
    result = subprocess.call(args=["xdpyinfo", "--display", display],
                             stdout=utils.devnull,
                             stderr=subprocess.STDOUT)
    return result == 0


def _find_free_display():
    for i in range(100, 1000):
        display = ":%s" % i
        if not _try_display(display):
            return display

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