# tests are fairly 'live' (but safe to run)
# setup authorized_keys for logged in user such
# that the user can log in as themselves before running tests

import unittest
import getpass
import ansible.runner
import os
import shutil
import time
try:
    import json
except:
    import simplejson as json

from nose.plugins.skip import SkipTest

def get_binary(name):
    for directory in os.environ["PATH"].split(os.pathsep):
        path = os.path.join(directory, name)
        if os.path.isfile(path) and os.access(path, os.X_OK):
            return path
    return None

class TestRunner(unittest.TestCase):

    def setUp(self):
        self.user = getpass.getuser()
        self.runner = ansible.runner.Runner(
            module_name='ping',
            module_path='library/',
            module_args='',
            remote_user=self.user,
            remote_pass=None,
            host_list='test/ansible_hosts',
            timeout=5,
            forks=1,
            background=0,
            pattern='all',
        )
        self.cwd = os.getcwd()
        self.test_dir = os.path.join(self.cwd, 'test')
        self.stage_dir = self._prepare_stage_dir()

    def _prepare_stage_dir(self):
        stage_path = os.path.join(self.test_dir, 'test_data')
        if os.path.exists(stage_path):
            shutil.rmtree(stage_path, ignore_errors=False)
            assert not os.path.exists(stage_path)
        os.makedirs(stage_path)
        assert os.path.exists(stage_path)
        return stage_path

    def _get_test_file(self, filename):
        # get a file inside the test input directory
        filename = os.path.join(self.test_dir, filename)
        assert os.path.exists(filename)
        return filename

    def _get_stage_file(self, filename):
        # get a file inside the test output directory
        filename = os.path.join(self.stage_dir, filename)
        return filename

    def _run(self, module_name, module_args, background=0):
        ''' run a module and get the localhost results '''
        self.runner.module_name = module_name
        args = ' '.join(module_args)
        print "DEBUG: using args=%s" % args
        self.runner.module_args = args
        self.runner.background = background
        results = self.runner.run()
        # when using nosetests this will only show up on failure
        # which is pretty useful
        print "RESULTS=%s" % results
        assert "127.0.0.2" in results['contacted']
        return results['contacted']['127.0.0.2']

    def test_ping(self):
        result = self._run('ping', [])
        assert "ping" in result

    def test_facter(self):
        if not get_binary("facter"):
            raise SkipTest
        result = self._run('facter', [])
        assert "hostname" in result

    # temporarily disbabled since it occasionally hangs
    # ohai's fault, setup module doesn't actually run this
    # to get ohai's "facts" anyway
    #
    #def test_ohai(self):
    #    if not get_binary("facter"):
    #            raise SkipTest
    #    result = self._run('ohai',[])
    #    assert "hostname" in result

    def test_copy(self):
        # test copy module, change trigger, etc
        input_ = self._get_test_file('sample.j2')
        output = self._get_stage_file('sample.out')
        assert not os.path.exists(output)
        result = self._run('copy', [
            "src=%s" % input_,
            "dest=%s" % output,
        ])
        assert os.path.exists(output)
        data_in = file(input_).read()
        data_out = file(output).read()
        assert data_in == data_out
        assert 'failed' not in result
        assert result['changed'] == True
        assert 'md5sum' in result
        result = self._run('copy', [
            "src=%s" % input_,
            "dest=%s" % output,
        ])
        assert result['changed'] == False

    def test_command(self):
        # test command module, change trigger, etc
        result = self._run('command', [ "/bin/echo", "hi" ])
        assert "failed" not in result
        assert "msg" not in result
        assert result['rc'] == 0
        assert result['stdout'] == 'hi'
        assert result['stderr'] == ''

        result = self._run('command', [ "false" ])
        assert result['rc'] == 1
        assert 'failed' not in result

        result = self._run('command', [ "/usr/bin/this_does_not_exist", "splat" ])
        assert 'msg' in result
        assert 'failed' in result
        assert 'rc' not in result

        result = self._run('shell', [ "/bin/echo", "$HOME" ])
        assert 'failed' not in result
        assert result['rc'] == 0

    def test_large_output(self):
        large_path = "/usr/share/dict/words"
        if not os.path.exists(large_path):
            large_path = "/usr/share/dict/cracklib-small"
            if not os.path.exists(large_path):
                raise SkipTest
        # Ensure reading a large amount of output from a command doesn't hang.
        result = self._run('command', [ "/bin/cat", large_path ])
        assert "failed" not in result
        assert "msg" not in result
        assert result['rc'] == 0
        assert len(result['stdout']) > 100000
        assert result['stderr'] == ''

    def test_async(self):
        # test async launch and job status
        # of any particular module
        result = self._run('command', [ get_binary("sleep"), "3" ], background=20)
        assert 'ansible_job_id' in result
        assert 'started' in result
        jid = result['ansible_job_id']
        # no real chance of this op taking a while, but whatever
        time.sleep(5)
        # CLI will abstract this (when polling), but this is how it works internally
        result = self._run('async_status', [ "jid=%s" % jid ])
        # TODO: would be nice to have tests for supervisory process
        # killing job after X seconds
        assert 'finished' in result
        assert 'failed' not in result
        assert 'rc' in result
        assert 'stdout' in result
        assert result['ansible_job_id'] == jid

    def test_fetch(self):
        input_ = self._get_test_file('sample.j2')
        output = os.path.join(self.stage_dir, '127.0.0.2', input_)
        result = self._run('fetch', [ "src=%s" % input_, "dest=%s" % self.stage_dir ])
        assert os.path.exists(output)
        assert open(input_).read() == open(output).read()

    def test_yum(self):
        if not get_binary("yum"):
            raise SkipTest
        result = self._run('yum', [ "list=repos" ])
        assert 'failed' not in result

    def test_git(self):
        # TODO: tests for the git module
        pass

    def test_service(self):
        # TODO: tests for the service module
        pass

    def test_assemble(self):
        input = self._get_test_file('assemble.d')
        output = self._get_stage_file('sample.out')
        result = self._run('assemble', [
            "src=%s" % input,
            "dest=%s" % output,
        ])
        assert os.path.exists(output)
        out = file(output).read()
        assert out.find("first") != -1
        assert out.find("second") != -1
        assert out.find("third") != -1
        assert result['changed'] == True
        assert 'md5sum' in result
        assert 'failed' not in result
        result = self._run('assemble', [
            "src=%s" % input,
            "dest=%s" % output,
        ])
        assert result['changed'] == False