"""Tests for launchers

Doesn't actually start any subprocesses, but goes through the motions of constructing
objects, which should test basic config.

Authors:

* Min RK
"""

#-------------------------------------------------------------------------------
#  Copyright (C) 2013 The IPython Development Team
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
#-------------------------------------------------------------------------------

#-------------------------------------------------------------------------------
# Imports
#-------------------------------------------------------------------------------

import logging
import os
import shutil
import sys
import tempfile

from unittest import TestCase

from nose import SkipTest

from IPython.config import Config

from IPython.parallel.apps import launcher

from IPython.testing import decorators as dec


#-------------------------------------------------------------------------------
# TestCase Mixins
#-------------------------------------------------------------------------------

class LauncherTest:
    """Mixin for generic launcher tests"""
    def setUp(self):
        self.profile_dir = tempfile.mkdtemp(prefix="profile_")
    
    def tearDown(self):
        shutil.rmtree(self.profile_dir)
    
    @property
    def config(self):
        return Config()
    
    def build_launcher(self, **kwargs):
        kw = dict(
            work_dir=self.profile_dir,
            profile_dir=self.profile_dir,
            config=self.config,
            cluster_id='',
            log=logging.getLogger(),
        )
        kw.update(kwargs)
        return self.launcher_class(**kw)

    def test_profile_dir_arg(self):
        launcher = self.build_launcher()
        self.assertTrue("--profile-dir" in launcher.cluster_args)
        self.assertTrue(self.profile_dir in launcher.cluster_args)

    def test_cluster_id_arg(self):
        launcher = self.build_launcher()
        self.assertTrue("--cluster-id" in launcher.cluster_args)
        idx = launcher.cluster_args.index("--cluster-id")
        self.assertEqual(launcher.cluster_args[idx+1], '')
        launcher.cluster_id = 'foo'
        self.assertEqual(launcher.cluster_args[idx+1], 'foo')
    
    def test_args(self):
        launcher = self.build_launcher()
        for arg in launcher.args:
            self.assertTrue(isinstance(arg, basestring), str(arg))

class BatchTest:
    """Tests for batch-system launchers (LSF, SGE, PBS)"""
    def test_batch_template(self):
        launcher = self.build_launcher()
        batch_file = os.path.join(self.profile_dir, launcher.batch_file_name)
        self.assertEqual(launcher.batch_file, batch_file)
        launcher.write_batch_script(1)
        self.assertTrue(os.path.isfile(batch_file))

class SSHTest:
    """Tests for SSH launchers"""
    def test_cluster_id_arg(self):
        raise SkipTest("SSH Launchers don't support cluster ID")
    
    def test_remote_profile_dir(self):
        cfg = Config()
        launcher_cfg = getattr(cfg, self.launcher_class.__name__)
        launcher_cfg.remote_profile_dir = "foo"
        launcher = self.build_launcher(config=cfg)
        self.assertEqual(launcher.remote_profile_dir, "foo")

    def test_remote_profile_dir_default(self):
        launcher = self.build_launcher()
        self.assertEqual(launcher.remote_profile_dir, self.profile_dir)

#-------------------------------------------------------------------------------
# Controller Launcher Tests
#-------------------------------------------------------------------------------

class ControllerLauncherTest(LauncherTest):
    """Tests for Controller Launchers"""
    pass

class TestLocalControllerLauncher(ControllerLauncherTest, TestCase):
    launcher_class = launcher.LocalControllerLauncher

class TestMPIControllerLauncher(ControllerLauncherTest, TestCase):
    launcher_class = launcher.MPIControllerLauncher

class TestPBSControllerLauncher(BatchTest, ControllerLauncherTest, TestCase):
    launcher_class = launcher.PBSControllerLauncher

class TestSGEControllerLauncher(BatchTest, ControllerLauncherTest, TestCase):
    launcher_class = launcher.SGEControllerLauncher

class TestLSFControllerLauncher(BatchTest, ControllerLauncherTest, TestCase):
    launcher_class = launcher.LSFControllerLauncher

class TestHTCondorControllerLauncher(BatchTest, ControllerLauncherTest, TestCase):
    launcher_class = launcher.HTCondorControllerLauncher

class TestSSHControllerLauncher(SSHTest, ControllerLauncherTest, TestCase):
    launcher_class = launcher.SSHControllerLauncher

#-------------------------------------------------------------------------------
# Engine Set Launcher Tests
#-------------------------------------------------------------------------------

class EngineSetLauncherTest(LauncherTest):
    """Tests for EngineSet launchers"""
    pass

class TestLocalEngineSetLauncher(EngineSetLauncherTest, TestCase):
    launcher_class = launcher.LocalEngineSetLauncher

class TestMPIEngineSetLauncher(EngineSetLauncherTest, TestCase):
    launcher_class = launcher.MPIEngineSetLauncher

class TestPBSEngineSetLauncher(BatchTest, EngineSetLauncherTest, TestCase):
    launcher_class = launcher.PBSEngineSetLauncher

class TestSGEEngineSetLauncher(BatchTest, EngineSetLauncherTest, TestCase):
    launcher_class = launcher.SGEEngineSetLauncher

class TestLSFEngineSetLauncher(BatchTest, EngineSetLauncherTest, TestCase):
    launcher_class = launcher.LSFEngineSetLauncher

class TestHTCondorEngineSetLauncher(BatchTest, EngineSetLauncherTest, TestCase):
    launcher_class = launcher.HTCondorEngineSetLauncher

class TestSSHEngineSetLauncher(EngineSetLauncherTest, TestCase):
    launcher_class = launcher.SSHEngineSetLauncher
    
    def test_cluster_id_arg(self):
        raise SkipTest("SSH Launchers don't support cluster ID")

class TestSSHProxyEngineSetLauncher(SSHTest, LauncherTest, TestCase):
    launcher_class = launcher.SSHProxyEngineSetLauncher

class TestSSHEngineLauncher(SSHTest, LauncherTest, TestCase):
    launcher_class = launcher.SSHEngineLauncher

#-------------------------------------------------------------------------------
# Windows Launcher Tests
#-------------------------------------------------------------------------------

if sys.platform.startswith("win"):
    class TestWinHPCControllerLauncher(ControllerLauncherTest, TestCase):
        launcher_class = launcher.WindowsHPCControllerLauncher

    class TestWinHPCEngineSetLauncher(EngineSetLauncherTest, TestCase):
        launcher_class = launcher.WindowsHPCEngineSetLauncher
