# Copyright (C) 2016 Intel Corporation
# Released under the MIT license (see COPYING.MIT)

import os

from oeqa.core.context import OETestContext, OETestContextExecutor
from oeqa.core.target.ssh import OESSHTarget
from oeqa.core.target.qemu import OEQemuTarget
from oeqa.utils.dump import HostDumper

from oeqa.runtime.loader import OERuntimeTestLoader

class OERuntimeTestContext(OETestContext):
    loaderClass = OERuntimeTestLoader
    runtime_files_dir = os.path.join(
                        os.path.dirname(os.path.abspath(__file__)), "files")

    def __init__(self, td, logger, target,
                 host_dumper, image_packages, extract_dir):
        super(OERuntimeTestContext, self).__init__(td, logger)

        self.target = target
        self.image_packages = image_packages
        self.host_dumper = host_dumper
        self.extract_dir = extract_dir
        self._set_target_cmds()

    def _set_target_cmds(self):
        self.target_cmds = {}

        self.target_cmds['ps'] = 'ps'
        if 'procps' in self.image_packages:
            self.target_cmds['ps'] = self.target_cmds['ps'] + ' -ef'

class OERuntimeTestContextExecutor(OETestContextExecutor):
    _context_class = OERuntimeTestContext

    name = 'runtime'
    help = 'runtime test component'
    description = 'executes runtime tests over targets'

    default_cases = os.path.join(os.path.abspath(os.path.dirname(__file__)),
            'cases')
    default_data = None
    default_test_data = 'data/testdata.json'
    default_tests = ''

    default_target_type = 'simpleremote'
    default_manifest = 'data/manifest'
    default_server_ip = '192.168.7.1'
    default_target_ip = '192.168.7.2'
    default_host_dumper_dir = '/tmp/oe-saved-tests'
    default_extract_dir = 'packages/extracted'

    def register_commands(self, logger, subparsers):
        super(OERuntimeTestContextExecutor, self).register_commands(logger, subparsers)

        runtime_group = self.parser.add_argument_group('runtime options')

        runtime_group.add_argument('--target-type', action='store',
                default=self.default_target_type, choices=['simpleremote', 'qemu'],
                help="Target type of device under test, default: %s" \
                % self.default_target_type)
        runtime_group.add_argument('--target-ip', action='store',
                default=self.default_target_ip,
                help="IP address of device under test, default: %s" \
                % self.default_target_ip)
        runtime_group.add_argument('--server-ip', action='store',
                default=self.default_target_ip,
                help="IP address of device under test, default: %s" \
                % self.default_server_ip)

        runtime_group.add_argument('--host-dumper-dir', action='store',
                default=self.default_host_dumper_dir,
                help="Directory where host status is dumped, if tests fails, default: %s" \
                % self.default_host_dumper_dir)

        runtime_group.add_argument('--packages-manifest', action='store',
                default=self.default_manifest,
                help="Package manifest of the image under testi, default: %s" \
                % self.default_manifest)

        runtime_group.add_argument('--extract-dir', action='store',
                default=self.default_extract_dir,
                help='Directory where extracted packages reside, default: %s' \
                % self.default_extract_dir)

        runtime_group.add_argument('--qemu-boot', action='store',
                help="Qemu boot configuration, only needed when target_type is QEMU.")

    @staticmethod
    def getTarget(target_type, logger, target_ip, server_ip, **kwargs):
        target = None

        if target_type == 'simpleremote':
            target = OESSHTarget(logger, target_ip, server_ip, **kwargs)
        elif target_type == 'qemu':
            target = OEQemuTarget(logger, target_ip, server_ip, **kwargs)
        else:
            # XXX: This code uses the old naming convention for controllers and
            # targets, the idea it is to leave just targets as the controller
            # most of the time was just a wrapper.
            # XXX: This code tries to import modules from lib/oeqa/controllers
            # directory and treat them as controllers, it will less error prone
            # to use introspection to load such modules.
            # XXX: Don't base your targets on this code it will be refactored
            # in the near future.
            # Custom target module loading
            try:
                target_modules_path = kwargs.get('target_modules_path', '')
                controller = OERuntimeTestContextExecutor.getControllerModule(target_type, target_modules_path)
                target = controller(logger, target_ip, server_ip, **kwargs)
            except ImportError as e:
                raise TypeError("Failed to import %s from available controller modules" % target_type)

        return target

    # Search oeqa.controllers module directory for and return a controller
    # corresponding to the given target name.
    # AttributeError raised if not found.
    # ImportError raised if a provided module can not be imported.
    @staticmethod
    def getControllerModule(target, target_modules_path):
        controllerslist = OERuntimeTestContextExecutor._getControllerModulenames(target_modules_path)
        controller = OERuntimeTestContextExecutor._loadControllerFromName(target, controllerslist)
        return controller

    # Return a list of all python modules in lib/oeqa/controllers for each
    # layer in bbpath
    @staticmethod
    def _getControllerModulenames(target_modules_path):

        controllerslist = []

        def add_controller_list(path):
            if not os.path.exists(os.path.join(path, '__init__.py')):
                raise OSError('Controllers directory %s exists but is missing __init__.py' % path)
            files = sorted([f for f in os.listdir(path) if f.endswith('.py') and not f.startswith('_')])
            for f in files:
                module = 'oeqa.controllers.' + f[:-3]
                if module not in controllerslist:
                    controllerslist.append(module)
                else:
                    raise RuntimeError("Duplicate controller module found for %s. Layers should create unique controller module names" % module)

        extpath = target_modules_path.split(':')
        for p in extpath:
            controllerpath = os.path.join(p, 'lib', 'oeqa', 'controllers')
            if os.path.exists(controllerpath):
                add_controller_list(controllerpath)
        return controllerslist

    # Search for and return a controller from given target name and
    # set of module names.
    # Raise AttributeError if not found.
    # Raise ImportError if a provided module can not be imported
    @staticmethod
    def _loadControllerFromName(target, modulenames):
        for name in modulenames:
            obj = OERuntimeTestContextExecutor._loadControllerFromModule(target, name)
            if obj:
                return obj
        raise AttributeError("Unable to load {0} from available modules: {1}".format(target, str(modulenames)))

    # Search for and return a controller or None from given module name
    @staticmethod
    def _loadControllerFromModule(target, modulename):
        obj = None
        # import module, allowing it to raise import exception
        try:
            module = __import__(modulename, globals(), locals(), [target])
        except Exception as e:
            return obj
        # look for target class in the module, catching any exceptions as it
        # is valid that a module may not have the target class.
        try:
            obj = getattr(module, target)
        except:
            obj = None
        return obj
        
    @staticmethod
    def readPackagesManifest(manifest):
        if not manifest or not os.path.exists(manifest):
            raise OSError("Manifest file not exists: %s" % manifest)

        image_packages = set()
        with open(manifest, 'r') as f:
            for line in f.readlines():
                line = line.strip()
                if line and not line.startswith("#"):
                    image_packages.add(line.split()[0])

        return image_packages

    @staticmethod
    def getHostDumper(cmds, directory):
        return HostDumper(cmds, directory)

    def _process_args(self, logger, args):
        if not args.packages_manifest:
            raise TypeError('Manifest file not provided')

        super(OERuntimeTestContextExecutor, self)._process_args(logger, args)

        target_kwargs = {}
        target_kwargs['qemuboot'] = args.qemu_boot

        self.tc_kwargs['init']['target'] = \
                OERuntimeTestContextExecutor.getTarget(args.target_type,
                        None, args.target_ip, args.server_ip, **target_kwargs)
        self.tc_kwargs['init']['host_dumper'] = \
                OERuntimeTestContextExecutor.getHostDumper(None,
                        args.host_dumper_dir)
        self.tc_kwargs['init']['image_packages'] = \
                OERuntimeTestContextExecutor.readPackagesManifest(
                        args.packages_manifest)
        self.tc_kwargs['init']['extract_dir'] = args.extract_dir

_executor_class = OERuntimeTestContextExecutor