#!@PYTHON@
# -*- mode: Python; indent-tabs-mode: nil; -*-

import atexit
import datetime
import json
import optparse
import os
import random
import re
import shutil
import signal
import subprocess
import sys
import tempfile
import termios
import time
import errno

def show_version(option, opt_str, value, parser):
    print "GNOME Shell @VERSION@"
    sys.exit()

def get_running_session_environs():
    wanted_environment = ['DBUS_SESSION_BUS_ADDRESS', 'DISPLAY', 'XDG_DATA_DIRS',
                          'XAUTHORITY', 'XDG_SESSION_COOKIE', 'ORBIT_SOCKETDIR',
                          'SESSION_MANAGER']
    num_re = re.compile('^[0-9]+$')
    myuid = os.getuid()
    if not os.path.isdir('/proc'):
        return {}
    for filename in os.listdir('/proc'):
        if not num_re.match(filename):
            continue
        piddir = '/proc/' + filename
        try:
            stat = os.stat(piddir)
        except OSError, e:
            continue
        if not stat.st_uid == myuid:
            continue
        try:
            f = open(piddir + "/cmdline")
            command = f.read()
            f.close()
        except IOError, e:
            continue
        # /proc/cmdline is separated and terminated by NULs
        command = command.split("\x00")[0]
        command = os.path.basename(command)
        if command != 'gnome-session':
            continue
        try:
            f = open(os.path.join(piddir, 'environ'))
        except OSError, e:
            continue
        environ_data = f.read()
        f.close()
        # There's a trailing null at the last one, so remove the
        # empty string
        environs = environ_data.split('\0')[:-1]
        # Rumor has it the presence of just FOO (instead of FOO=bar)
        # represents a deleted environment variable
        environs = filter(lambda x: '=' in x, environs)
        # Turn it into a dictionary
        environs = dict(map(lambda x: x.split('=', 1), environs))
        result = {}
        for key in wanted_environment:
            if key in environs:
                result[key] = environs[key]
        return result

def start_xephyr():
    tmpdir = tempfile.mkdtemp("", "gnome-shell.")
    atexit.register(shutil.rmtree, tmpdir)

    display = ":" + str(random.randint(10, 99))
    xauth_file = os.path.join(tmpdir, "database")

    # Create a random 128-bit key and format it as hex
    f = open("/dev/urandom", "r")
    key = f.read(16)
    f.close()
    hexkey = "".join(("%02x" % ord(byte) for byte in key))

    # Store that in an xauthority file as the key for connecting to our Xephyr
    retcode = subprocess.call(["xauth",
                               "-f", xauth_file,
                               "add", display,  "MIT-MAGIC-COOKIE-1", hexkey])
    if retcode != 0:
        raise RuntimeError("xauth failed")

    # Launch Xephyr
    try:
        xephyr = subprocess.Popen(["Xephyr", display,
                                   "-auth", xauth_file,
                                   "-screen", options.geometry,
                                   "-host-cursor"])
    except OSError, e:
        if e.errno == errno.ENOENT:
            print "Could not find Xephyr."
            sys.exit(1)
        else:
            raise
    os.environ['DISPLAY'] = display
    os.environ['XAUTHORITY'] = xauth_file

    # Wait for server to get going: LAME
    time.sleep(1)

    # Start some windows in our session.
    subprocess.Popen(["gnome-terminal"])

    return xephyr;

GLXINFO_RE = re.compile(r"^(\S.*):\s*\n((?:^\s+.*\n)*)", re.MULTILINE)

def _get_glx_extensions():
    """Return a tuple of server, client, and effective GLX extensions"""

    glxinfo = subprocess.Popen(["glxinfo"], stdout=subprocess.PIPE)
    glxinfo_output = glxinfo.communicate()[0]
    glxinfo.wait()

    glxinfo_map = {}
    for m in GLXINFO_RE.finditer(glxinfo_output):
        glxinfo_map[m.group(1)] = m.group(2)

    server_glx_extensions = set(re.split("\s*,\s*", glxinfo_map['server glx extensions'].strip()))
    client_glx_extensions = set(re.split("\s*,\s*", glxinfo_map['client glx extensions'].strip()))
    glx_extensions = set(re.split("\s*,\s*", glxinfo_map['GLX extensions'].strip()))

    return (server_glx_extensions, client_glx_extensions, glx_extensions)

def start_shell(perf_output=None):
    bin_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
    if os.path.exists(os.path.join(bin_dir, 'gnome-shell.in')):
        running_from_source_tree = True
        top_dir = os.path.dirname(bin_dir)
        plugin = os.path.join(top_dir, 'src', 'libgnome-shell.la')
        typelib_dir = os.path.join(top_dir, "src")
        js_dir = os.path.join(top_dir, "js")
        data_dir = os.path.join(top_dir, "data")
    else:
        running_from_source_tree = False
        plugin = 'libgnome-shell'
        js_dir = os.path.join('@pkgdatadir@', 'js')

    # Set up environment
    env = dict(os.environ)
    env.update({'GNOME_SHELL_JS'      : '@GJS_JS_DIR@:@GJS_JS_NATIVE_DIR@:' + js_dir,
                'PATH'                : '@MUTTER_BIN_DIR@:' + os.environ.get('PATH', ''),
                'GNOME_DISABLE_CRASH_DIALOG' : '1'})

    if running_from_source_tree:
        env.update({'GNOME_SHELL_DATADIR' : data_dir,
                    'GI_TYPELIB_PATH'     : typelib_dir})

    jhbuild_gconf_source = os.path.join('@sysconfdir@', 'gconf/2/path.jhbuild')
    if os.path.exists(jhbuild_gconf_source):
        env['GCONF_DEFAULT_SOURCE_PATH'] = jhbuild_gconf_source

    # Work around Ubuntu xulrunner bug,
    # http://bugzilla.gnome.org/show_bug.cgi?id=573413
    pkgconfig = subprocess.Popen(['pkg-config', '--variable=sdkdir', 'mozilla-js'],
                                 stdout=subprocess.PIPE)
    mozjs_sdkdir = pkgconfig.communicate()[0].strip()
    pkgconfig.wait()
    if pkgconfig.returncode == 0:
        mozjs_libdir = re.sub('-(sdk|devel)', '', mozjs_sdkdir)
        if os.path.exists(mozjs_libdir + '/libmozjs.so'):
            env['LD_LIBRARY_PATH'] = os.environ.get('LD_LIBRARY_PATH', '') + ':' + mozjs_libdir

    # Log everything to stderr (make stderr our "log file")
    env['GJS_DEBUG_OUTPUT'] = 'stderr'

    if not options.verbose:
        # Unless verbose() is specified, only let gjs show errors and
        # things that are explicitly logged via log() from javascript
        env['GJS_DEBUG_TOPICS'] = 'JS ERROR;JS LOG'

    if use_tfp:
        # Decide if we need to set LIBGL_ALWAYS_INDIRECT=1 to get the
        # texture_from_pixmap extension; we take having the extension
        # be supported on both the client and server but not in the
        # list of effective extensions as a signal of needing to force
        # indirect rendering.
        #
        # Note that this check would give the wrong answer for Xephyr,
        # but since we force !use_tfp there anyway, it doesn't matter.
        (server_glx_extensions, client_glx_extensions, glx_extensions) = _get_glx_extensions()

        if ("GLX_EXT_texture_from_pixmap" in server_glx_extensions and
            "GLX_EXT_texture_from_pixmap" in client_glx_extensions and
            (not "GLX_EXT_texture_from_pixmap" in glx_extensions)):
            if options.verbose:
                print "Forcing indirect GL"
            # This is Mesa specific; the NVIDIA proprietary drivers
            # drivers use __GL_FORCE_INDIRECT=1 instead. But we don't
            # need to force indirect rendering for NVIDIA.
            env['LIBGL_ALWAYS_INDIRECT'] = '1'

    if options.perf is not None:
        env['SHELL_PERF_MODULE'] = options.perf

    if perf_output is not None:
        env['SHELL_PERF_OUTPUT'] = perf_output

    if options.debug:
        debug_command = options.debug_command.split()
        args = list(debug_command)
    else:
        args = []
        
    args.extend(['mutter', '--mutter-plugins=' + plugin])
    if options.replace:
        args.append('--replace')
    if options.sync:
        args.append('--sync')
    return subprocess.Popen(args, env=env)

def run_shell(perf_output=None):
    if options.debug:
        # Record initial terminal state so we can reset it to that
        # later, in case we kill gdb at a bad time
        termattrs = termios.tcgetattr(0);

    normal_exit = False

    if options.verbose:
        print "Starting shell"

    try:
        shell = None
        if options.xephyr:
            xephyr = start_xephyr()
            # This makes us not grab the org.gnome.Panel or
            # org.freedesktop.Notifications D-Bus names
            os.environ['GNOME_SHELL_NO_REPLACE'] = '1'
            shell = start_shell()
        else:
            xephyr = None
            shell = start_shell(perf_output=perf_output)

        # Wait for shell to exit
        if options.verbose:
            print "Waiting for shell to exit"
        shell.wait()

    except KeyboardInterrupt, e:
        try:
            os.kill(shell.pid, signal.SIGKILL)
        except:
            pass
        shell.wait()
    finally:
        # Clean up Xephyr if it outlived the shell
        if xephyr:
            try:
                os.kill(xephyr.pid, signal.SIGKILL)
            except OSError:
                pass

        if shell is None:
            print "Failed to start shell"
        elif shell.returncode == 0:
            normal_exit = True
            if options.verbose:
                print "Shell exited normally"
        elif shell.returncode < 0:
            # Python has no mapping for strsignal; not worth using
            # ctypes for this.
            print "Shell killed with signal %d" % - shell.returncode
        else:
            # Normal reason here would be losing connection the X server
            if options.verbose:
                print "Shell exited with return code %d" % shell.returncode

        if options.debug:
            termios.tcsetattr(0, termios.TCSANOW, termattrs);

    return normal_exit

def run_performance_test():
    iters = options.perf_iters
    if options.perf_warmup:
        iters += 1

    logs = []
    metric_summaries = {}

    for i in xrange(0, iters):
        # We create an empty temporary file that the shell will overwrite
        # with the contents.
        handle, output_file = tempfile.mkstemp(".json", "gnome-shell-perf.")
        os.close(handle)

        # Run the performance test and collect the output as JSON
        normal_exit = False
        try:
            normal_exit = run_shell(perf_output=output_file)
        finally:
            if not normal_exit:
                os.remove(output_file)

        if not normal_exit:
            return False

        try:
            f = open(output_file)
            output = json.load(f)
            f.close()
        finally:
            os.remove(output_file)

        # Grab the event definitions the first time around
        if i == 0:
            events = output['events']

        if options.perf_warmup and i == 0:
            continue

        for metric in output['metrics']:
            name = metric['name']
            if not name in metric_summaries:
                summary = {}
                summary['description'] = metric['description']
                summary['units'] = metric['units']
                summary['values'] = []
                metric_summaries[name] = summary
            else:
                summary = metric_summaries[name]

            summary['values'].append(metric['value'])

        logs.append(output['log'])

    if options.perf_output:
        # Write a complete report, formatted as JSON. The Javascript/C code that
        # generates the individual reports we are summarizing here is very careful
        # to format them nicely, but we just dump out a compressed no-whitespace
        # version here for simplicity. Using json.dump(indent=0) doesn't real
        # improve the readability of the output much.
        report = {
            'date': datetime.datetime.now().isoformat(),
            'events': events,
            'metrics': metric_summaries,
            'logs': logs
        }

        # Add the Git revision if available
        bin_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
        if os.path.exists(os.path.join(bin_dir, 'gnome-shell.in')):
            top_dir = os.path.dirname(bin_dir)
            git_dir = os.path.join(top_dir, '.git')
            if os.path.exists(git_dir):
                env = dict(os.environ)
                env['GIT_DIR'] = git_dir
                revision = subprocess.Popen(['git', 'rev-parse', 'HEAD'],
                                            env=env,
                                            stdout=subprocess.PIPE).communicate()[0].strip()
                report['revision'] = revision

        f = open(options.perf_output, 'w')
        json.dump(report, f)
        f.close()
    else:
        # Write a human readable summary
        print '------------------------------------------------------------';
        for metric in sorted(metric_summaries.keys()):
            summary = metric_summaries[metric]
            print "#", summary['description']
            print metric, ", ".join((str(x) for x in summary['values']))
        print '------------------------------------------------------------';

    return True

def restore_gnome():
    # Do imports lazily to save time and memory
    import gio
    import gconf

    # We don't want to start the new gnome-panel in the current
    # directory; $HOME is better for stuff launched from it
    os.chdir(os.path.expanduser("~"))

    def launch_component(gconf_path):
        client = gconf.client_get_default()
        component = client.get_string(gconf_path)

        if component == None or component == "":
            return

        # See gnome-session/gsm-util.c:gsm_util_find_desktop_file_for_app_name()
        # The one difference is that we don't search the autostart directories,
        # and just search normal application search path. (Gio doesnt' know
        # how to search the autostart dirs, so we'd have to do that ourselves.)
        appinfo = None
        try:
            appinfo = gio.unix.DesktopAppInfo(component + ".desktop")
        except:
            try:
                appinfo = gio.unix.DesktopAppInfo("gnome-" + component + ".desktop")
            except:
                pass

        if appinfo:
            appinfo.launch()

    launch_component("/desktop/gnome/session/required_components/windowmanager")
    launch_component("/desktop/gnome/session/required_components/panel")

# Main program

parser = optparse.OptionParser()
parser.add_option("-r", "--replace", action="store_true",
                  help="Replace the running metacity/gnome-panel")
parser.add_option("-g", "--debug", action="store_true",
                  help="Run under a debugger")
parser.add_option("", "--debug-command", metavar="COMMAND",
                  help="Command to use for debugging (defaults to 'gdb --args')")
parser.add_option("-v", "--verbose", action="store_true")
parser.add_option("", "--sync", action="store_true")
parser.add_option("", "--perf", metavar="PERF_MODULE",
		  help="Specify the name of a performance module to run")
parser.add_option("", "--perf-iters", type="int", metavar="ITERS",
		  help="Numbers of iterations of performance module to run",
                  default=1)
parser.add_option("", "--perf-warmup", action="store_true",
		  help="Run a dry run before performance tests")
parser.add_option("", "--perf-output",
		  help="Output file to write performance report")
parser.add_option("", "--xephyr", action="store_true",
                  help="Run a debugging instance inside Xephyr")
parser.add_option("", "--geometry", metavar="GEOMETRY",
                  help="Specify Xephyr screen geometry",
                  default="1024x768");
parser.add_option("-w", "--wide", action="store_true",
                  help="Use widescreen (1280x800) with Xephyr")
parser.add_option("", "--eval-file", metavar="EVAL_FILE",
                  help="Evaluate the contents of the given JavaScript file")
parser.add_option("", "--create-extension", action="store_true",
                  help="Create a new GNOME Shell extension")
parser.add_option("", "--version", action="callback", callback=show_version,
                  help="Display version and exit")

options, args = parser.parse_args()

if args:
    parser.print_usage()
    sys.exit(1)

if options.create_extension:
    import json

    print
    print '''Name should be a very short (ideally descriptive) string.
Examples are: "Click To Focus",  "Adblock", "Shell Window Shrinker".
'''
    name = raw_input('Name: ').strip()
    print
    print '''Description is a single-sentence explanation of what your extension does.
Examples are: "Make windows visible on click", "Block advertisement popups"
              "Animate windows shrinking on minimize"
'''
    description = raw_input('Description: ').strip()
    underifier = re.compile('[^A-Za-z]')
    sample_uuid = underifier.sub('_', name)
    # TODO use evolution data server
    hostname = subprocess.Popen(['hostname'], stdout=subprocess.PIPE).communicate()[0].strip()
    sample_uuid = sample_uuid + '@' + hostname

    print
    print '''Uuid is a globally-unique identifier for your extension.
This should be in the format of an email address (foo.bar@extensions.example.com), but
need not be an actual email address, though it's a good idea to base the uuid on your
email address.  For example, if your email address is janedoe@example.com, you might
use an extension title clicktofocus@janedoe.example.com.'''
    uuid = raw_input('Uuid [%s]: ' % (sample_uuid, )).strip()
    if uuid == '':
        uuid = sample_uuid

    extension_path = os.path.join(os.path.expanduser('~/.local'), 'share', 'gnome-shell', 'extensions', uuid)
    if os.path.exists(extension_path):
        print "Extension path %r already exists" % (extension_path, )
        sys.exit(0)
    os.makedirs(extension_path)
    meta = { 'name': name,
             'description': description,
             'uuid': uuid }
    f = open(os.path.join(extension_path, 'metadata.json'), 'w')
    try:
        json.dump(meta, f)
    except AttributeError:
        # For Python versions older than 2.6, try using the json-py module
        f.write(json.write(meta) + '\n')
    f.close()

    extensionjs_path = os.path.join(extension_path, 'extension.js')
    f = open(extensionjs_path, 'w')
    f.write('''// Sample extension code, makes clicking on the panel show a message
const St = imports.gi.St;
const Mainloop = imports.mainloop;

const Main = imports.ui.main;

function _showHello() {
    let text = new St.Label({ style_class: 'helloworld-label', text: "Hello, world!" });
    let monitor = global.get_primary_monitor();
    global.stage.add_actor(text);
    text.set_position(Math.floor (monitor.width / 2 - text.width / 2), Math.floor(monitor.height / 2 - text.height / 2));
    Mainloop.timeout_add(3000, function () { text.destroy(); });
}

// Put your extension initialization code here
function main() {
    Main.panel.actor.reactive = true;
    Main.panel.actor.connect('button-release-event', _showHello);
}
''')
    f.close()

    f = open(os.path.join(extension_path, 'stylesheet.css'), 'w')
    f.write('''/* Example stylesheet */
.helloworld-label {
    font-size: 36px;
    font-weight: bold;
    color: #ffffff;
    background-color: rgba(10,10,10,0.7);
    border-radius: 5px;
}
''')
    f.close()

    subprocess.Popen(['gnome-open', extensionjs_path])
    sys.exit(0)

# Handle ssh logins
if 'DISPLAY' not in os.environ:
    running_env = get_running_session_environs()
    os.environ.update(running_env)

if options.eval_file:
    import dbus

    f = open(options.eval_file)
    contents = f.read()
    f.close()

    session = dbus.SessionBus()
    shell = session.get_object('org.gnome.Shell', '/org/gnome/Shell')
    shell = dbus.Interface(shell, 'org.gnome.Shell')
    result = shell.Eval(contents)
    print result
    sys.exit(0)

if options.debug_command:
    options.debug = True
elif options.debug:
    options.debug_command = "gdb --args"

if options.wide:
    options.geometry = "1280x800"

# Figure out whether or not to use GL_EXT_texture_from_pixmap. By default
# we use it iff we aren't running Xephyr, but we allow the user to
# explicitly disable it.
# FIXME: Move this to ClutterGlxPixmap like
# CLUTTER_PIXMAP_TEXTURE_RECTANGLE=disable.
if 'GNOME_SHELL_DISABLE_TFP' in os.environ and \
       os.environ['GNOME_SHELL_DISABLE_TFP'] != '':
    use_tfp = False
else:
    # tfp does not work correctly in Xephyr
    use_tfp = not options.xephyr

# We only respawn the previous environment on abnormal exit;
# for a clean exit, we assume that gnome-shell was replaced with
# something else.
normal_exit = False

try:
    if options.perf:
        normal_exit = run_performance_test()
    else:
        normal_exit = run_shell()
finally:
    if not options.xephyr and options.replace and (options.perf or not normal_exit):
        restore_gnome()