import os, os.path as osp

import signal

from tempfile import mkdtemp, NamedTemporaryFile, TemporaryFile

import tempfile

from Queue import Queue, Empty

from subprocess import Popen, check_call, CalledProcessError

from shutil import rmtree, copy as copyfile

from uuid import uuid4

# imported by default to simplify further import statements

from logilab.common.testlib import unittest_main, with_tempdir, InnerTest, Tags

from logilab.common.shellutils import getlogin

import cubicweb

from cubicweb.view import StartupView

from cubicweb.web.controller import Controller

from cubicweb.devtools.httptest import CubicWebServerTC

class VerboseCalledProcessError(CalledProcessError):

    def __init__(self, returncode, command, stdout, stderr):

        super(VerboseCalledProcessError, self).__init__(returncode, command)

        self.stdout = stdout

        self.stderr = stderr

    def __str__(self):

        str = [ super(VerboseCalledProcessError, self).__str__()]

        if self.stdout.strip():

            str.append('******************')

            str.append('* process stdout *')

            str.append('******************')

            str.append(self.stdout)

        if self.stderr.strip():

            str.append('******************')

            str.append('* process stderr *')

            str.append('******************')

            str.append(self.stderr)

        return '\n'.join(str)

class FirefoxHelper(object):

    profile_name_mask = 'PYTEST_PROFILE_%(uid)s'

    def __init__(self, url=None):

        self._process = None

        self._tmp_dir = mkdtemp()

        self._profile_data = {'uid': uuid4()}

        self._profile_name = self.profile_name_mask % self._profile_data

        fnull = open(os.devnull, 'w')

        stdout = TemporaryFile()

        stderr = TemporaryFile()

        try:

            home = osp.expanduser('~')

            user = getlogin()

            assert os.access(home, os.W_OK), \

                   'No write access to your home directory, Firefox will crash.'\

                   ' Are you sure "%s" is a valid home  for user "%s"' % (home, user)

            check_call(['firefox', '-no-remote', '-CreateProfile',

                        '%s %s' % (self._profile_name, self._tmp_dir)],

                                  stdout=stdout, stderr=stderr)

        except CalledProcessError, cpe:

            stdout.seek(0)

            stderr.seek(0)

            raise VerboseCalledProcessError(cpe.returncode, cpe.cmd, stdout.read(), stderr.read())

    def start(self, url):

        self.stop()

        fnull = open(os.devnull, 'w')

        self._process = Popen(['firefox', '-no-remote', '-P', self._profile_name, url],

                              stdout=fnull, stderr=fnull)

    def stop(self):

        if self._process is not None:

            assert self._process.returncode is None,  self._process.returncode

            os.kill(self._process.pid, signal.SIGTERM)

            self._process.wait()

            self._process = None

    def __del__(self):

        self.stop()

        rmtree(self._tmp_dir)

class QUnitTestCase(CubicWebServerTC):

    tags = CubicWebServerTC.tags | Tags(('qunit',))

    # testfile, (dep_a, dep_b)

    all_js_tests = ()

    def setUp(self):

        super(QUnitTestCase, self).setUp()

        self.test_queue = Queue()

        class MyQUnitResultController(QUnitResultController):

            tc = self

            test_queue = self.test_queue

        self._qunit_controller = MyQUnitResultController

        self.vreg.register(MyQUnitResultController)

    def tearDown(self):

        super(QUnitTestCase, self).tearDown()

        self.vreg.unregister(self._qunit_controller)

    def abspath(self, path):

        """use self.__module__ to build absolute path if necessary"""

        if not osp.isabs(path):

           dirname = osp.dirname(__import__(self.__module__).__file__)

           return osp.abspath(osp.join(dirname,path))

        return path

    def test_javascripts(self):

        for args in self.all_js_tests:

            test_file = self.abspath(args[0])

            if len(args) > 1:

                depends   = [self.abspath(dep) for dep in args[1]]

            else:

                depends = ()

            if len(args) > 2:

                data   = [self.abspath(data) for data in args[2]]

            else:

                data = ()

            for js_test in self._test_qunit(test_file, depends, data):

                yield js_test

    @with_tempdir

    def _test_qunit(self, test_file, depends=(), data_files=(), timeout=30):

        assert osp.exists(test_file), test_file

        for dep in depends:

            assert osp.exists(dep), dep

        for data in data_files:

            assert osp.exists(data), data

        # generate html test file

        jquery_dir = 'file://' + self.config.locate_resource('jquery.js')[0]

        html_test_file = NamedTemporaryFile(suffix='.html')

        html_test_file.write(make_qunit_html(test_file, depends,

                             base_url=self.config['base-url'],

                             web_data_path=jquery_dir))

        html_test_file.flush()

        # copying data file

        for data in data_files:

            copyfile(data, tempfile.tempdir)

        while not self.test_queue.empty():

            self.test_queue.get(False)

        browser = FirefoxHelper()

        browser.start(html_test_file.name)

        test_count = 0

        error = False

        def raise_exception(cls, *data):

            raise cls(*data)

        while not error:

            try:

                result, test_name, msg = self.test_queue.get(timeout=timeout)

                test_name = '%s (%s)' % (test_name, test_file)

                self.set_description(test_name)

                if result is None:

                    break

                test_count += 1

                if result:

                    yield InnerTest(test_name, lambda : 1)

                else:

                    yield InnerTest(test_name, self.fail, msg)

            except Empty:

                error = True

                yield InnerTest(test_file, raise_exception, RuntimeError, "%s did not report execution end. %i test processed so far." % (test_file, test_count))

        browser.stop()

        if test_count <= 0 and not error:

            yield InnerTest(test_name, raise_exception, RuntimeError, 'No test yielded by qunit for %s' % test_file)

class QUnitResultController(Controller):

    __regid__ = 'qunit_result'

    # Class variables to circumvent the instantiation of a new Controller for each request.

    _log_stack = [] # store QUnit log messages

    _current_module_name = '' # store the current QUnit module name

    def publish(self, rset=None):

        event = self._cw.form['event']

        getattr(self, 'handle_%s' % event)()

    def handle_module_start(self):

        self.__class__._current_module_name = self._cw.form.get('name', '')

    def handle_test_done(self):

        name = '%s // %s' %  (self._current_module_name, self._cw.form.get('name', ''))

        failures = int(self._cw.form.get('failures', 0))

        total = int(self._cw.form.get('total', 0))

        self._log_stack.append('%i/%i assertions failed' % (failures, total))

        msg = '\n'.join(self._log_stack)

        if failures:

            self.tc.test_queue.put((False, name, msg))

        else:

            self.tc.test_queue.put((True, name, msg))

        self._log_stack[:] = []

    def handle_done(self):

        self.tc.test_queue.put((None, None, None))

    def handle_log(self):

        result = self._cw.form['result']

        message = self._cw.form['message']

        self._log_stack.append('%s: %s' % (result, message))

def cw_path(*paths):

  return file_path(osp.join(cubicweb.CW_SOFTWARE_ROOT, *paths))

def file_path(path):

    return 'file://' + osp.abspath(path)

def build_js_script(host):

    return """

    var host = '%s';

    QUnit.moduleStart = function (name) {

      jQuery.ajax({

                  url: host+'/qunit_result',

                 data: {"event": "module_start",

                        "name": name},

                 async: false});

    }

    QUnit.testDone = function (name, failures, total) {

      jQuery.ajax({

                  url: host+'/qunit_result',

                 data: {"event": "test_done",

                        "name": name,

                        "failures": failures,

                        "total":total},

                 async: false});

    }

    QUnit.done = function (failures, total) {

      jQuery.ajax({

                   url: host+'/qunit_result',

                   data: {"event": "done",

                          "failures": failures,

                          "total":total},

                   async: false});

      window.close();

    }

    QUnit.log = function (result, message) {

      jQuery.ajax({

                   url: host+'/qunit_result',

                   data: {"event": "log",

                          "result": result,

                          "message": message},

                   async: false});

    }

    """ % host

def make_qunit_html(test_file, depends=(), base_url=None,

                    web_data_path=cw_path('web', 'data')):

    """"""

    data = {

            'web_data': web_data_path,

            'web_test': cw_path('devtools', 'data'),

        }

    html = ['''<html>

  <head>

    <!-- JS lib used as testing framework -->

    <link rel="stylesheet" type="text/css" media="all" href="%(web_test)s/qunit.css" />

    <script src="%(web_data)s/jquery.js" type="text/javascript"></script>

    <script src="%(web_test)s/cwmock.js" type="text/javascript"></script>

    <script src="%(web_test)s/qunit.js" type="text/javascript"></script>'''

    % data]

    if base_url is not None:

        html.append('<!-- result report tools -->')

        html.append('<script type="text/javascript">')

        html.append(build_js_script(base_url))

        html.append('</script>')

    html.append('<!-- Test script dependencies (tested code for example) -->')

    for dep in depends:

        html.append('    <script src="%s" type="text/javascript"></script>' % file_path(dep))

    html.append('    <!-- Test script itself -->')

    html.append('    <script src="%s" type="text/javascript"></script>'% (file_path(test_file),))

    html.append('''  </head>

  <body>

    <div id="main">

    </div>

    <h1 id="qunit-header">QUnit example</h1>

    <h2 id="qunit-banner"></h2>

    <h2 id="qunit-userAgent"></h2>

    <ol id="qunit-tests">

  </body>

</html>''')

    return u'\n'.join(html)

if __name__ == '__main__':

    unittest_main()