import os
import sys
import stat
import string
from collections import OrderedDict
from distutils.dir_util import copy_tree

from wa import ComplexCommand, SubCommand, pluginloader, settings
from wa.framework.target.descriptor import list_target_descriptions
from wa.framework.exception import ConfigError, CommandError
from wa.utils.misc import (ensure_directory_exists as _d, capitalize,
                           ensure_file_directory_exists as _f)
from wa.utils.serializer import yaml

from devlib.utils.types import identifier


TEMPLATES_DIR = os.path.join(os.path.dirname(__file__), 'templates')


class CreateAgendaSubcommand(SubCommand):

    name = 'agenda'
    description = """
    Create an agenda with the specified extensions enabled. And parameters set
    to their default values.
    """

    def initialize(self, context):
        self.parser.add_argument('plugins', nargs='+',
                                 help='Plugins to be added to the agendas')
        self.parser.add_argument('-i', '--iterations', type=int, default=1,
                                 help='Sets the number of iterations for all workloads')
        self.parser.add_argument('-o', '--output', metavar='FILE',
                                 help='Output file. If not specfied, STDOUT will be used instead.')

    def execute(self, state, args):
        agenda = OrderedDict()
        agenda['config'] = OrderedDict(instrumentation=[], output_processors=[])
        agenda['global'] = OrderedDict(iterations=args.iterations)
        agenda['workloads'] = []
        target_desc = None

        targets = {td.name: td for td in list_target_descriptions()}

        for name in args.plugins:
            if name in targets:
                if target_desc is not None:
                    raise ConfigError('Specifying multiple devices: {} and {}'.format(target_desc.name, name))
                target_desc = targets[name]
                agenda['config']['device'] = name
                agenda['config']['device_config'] = target_desc.get_default_config()
                continue

            extcls = pluginloader.get_plugin_class(name)
            config = pluginloader.get_default_config(name)

            if extcls.kind == 'workload':
                entry = OrderedDict()
                entry['name'] = extcls.name
                if name != extcls.name:
                    entry['label'] = name
                entry['params'] = config
                agenda['workloads'].append(entry)
            else:
                if extcls.kind == 'instrument':
                    agenda['config']['instrumentation'].append(name)
                if extcls.kind == 'output_processor':
                    agenda['config']['output_processors'].append(name)
                agenda['config'][name] = config

        if args.output:
            wfh = open(args.output, 'w')
        else:
            wfh = sys.stdout
        yaml.dump(agenda, wfh, indent=4, default_flow_style=False)
        if args.output:
            wfh.close()


class CreateWorkloadSubcommand(SubCommand):

    name = 'workload'
    description = '''Create a new workload. By default, a basic workload template will be
                     used but you can specify the `KIND` to choose a different template.'''

    def initialize(self, context):
        self.parser.add_argument('name', metavar='NAME',
                                 help='Name of the workload to be created')
        self.parser.add_argument('-p', '--path', metavar='PATH', default=None,
                                 help='The location at which the workload will be created. If not specified, ' +
                                      'this defaults to "~/.workload_automation/plugins".')
        self.parser.add_argument('-f', '--force', action='store_true',
                                 help='Create the new workload even if a workload with the specified ' +
                                      'name already exists.')
        self.parser.add_argument('-k', '--kind', metavar='KIND', default='basic', choices=create_funcs.keys(),
                                 help='The type of workload to be created. The available options ' +
                                      'are: {}'.format(', '.join(create_funcs.keys())))

    def execute(self, state, args):  # pylint: disable=R0201
        where = args.path or 'local'
        check_name = not args.force

        try:
            create_workload(args.name, args.kind, where, check_name)
        except CommandError as e:
            self.logger.error('ERROR: {}'.format(e))


class CreateCommand(ComplexCommand):

    name = 'create'
    description = '''
    Used to create various WA-related objects (see positional arguments list
    for what objects may be created).\n\nUse "wa create <object> -h" for
    object-specific arguments.
    '''
    subcmd_classes = [
        CreateWorkloadSubcommand,
        CreateAgendaSubcommand,
        #CreatePackageSubcommand,
    ]


def create_workload(name, kind='basic', where='local', check_name=True, **kwargs):

    if check_name:
        if name in [wl.name for wl in pluginloader.list_plugins('workload')]:
            raise CommandError('Workload with name "{}" already exists.'.format(name))

    class_name = get_class_name(name)
    if where == 'local':
        workload_dir = _d(os.path.join(settings.plugins_directory, name))
    else:
        workload_dir = _d(os.path.join(where, name))

    try:
        # Note: `create_funcs` mapping is listed below
        create_funcs[kind](workload_dir, name, kind, class_name, **kwargs)
    except KeyError:
        raise CommandError('Unknown workload type: {}'.format(kind))

    print 'Workload created in {}'.format(workload_dir)


def create_template_workload(path, name, kind, class_name):
    source_file = os.path.join(path, '__init__.py')
    with open(source_file, 'w') as wfh:
        wfh.write(render_template('{}_workload'.format(kind), {'name': name, 'class_name': class_name}))

def create_uiautomator_template_workload(path, name, kind, class_name):
    uiauto_path = os.path.join(path, 'uiauto')
    create_uiauto_project(uiauto_path, name)
    create_template_workload(path, name, kind, class_name)

def create_uiauto_project(path, name):
    package_name = 'com.arm.wa.uiauto.' + name.lower()

    copy_tree(os.path.join(TEMPLATES_DIR, 'uiauto', 'uiauto_workload_template'), path)

    manifest_path = os.path.join(path, 'app', 'src', 'main')
    mainifest = os.path.join(_d(manifest_path), 'AndroidManifest.xml')
    with open(mainifest, 'w') as wfh:
        wfh.write(render_template(os.path.join('uiauto', 'uiauto_AndroidManifest.xml'),
                                  {'package_name': package_name}))

    build_gradle_path = os.path.join(path, 'app')
    build_gradle = os.path.join(_d(build_gradle_path), 'build.gradle')
    with open(build_gradle, 'w') as wfh:
        wfh.write(render_template(os.path.join('uiauto', 'uiauto_build.gradle'),
                                  {'package_name': package_name}))

    build_script = os.path.join(path, 'build.sh')
    with open(build_script, 'w') as wfh:
        wfh.write(render_template(os.path.join('uiauto', 'uiauto_build_script'),
                                  {'package_name': package_name}))
    os.chmod(build_script, stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)

    source_file = _f(os.path.join(path, 'app', 'src', 'main', 'java',
                                  os.sep.join(package_name.split('.')[:-1]),
                                  'UiAutomation.java'))
    with open(source_file, 'w') as wfh:
        wfh.write(render_template(os.path.join('uiauto', 'UiAutomation.java'),
                                  {'name': name, 'package_name': package_name}))

# Mapping of workload types to their corresponding creation method
create_funcs = {
    'basic' : create_template_workload,
    'apk' : create_template_workload,
    'revent' : create_template_workload,
    'apk_revent' : create_template_workload,
    'uiauto' : create_uiautomator_template_workload,
    'apk_uiauto' : create_uiautomator_template_workload,
}

# Utility functions
def render_template(name, params):
    filepath = os.path.join(TEMPLATES_DIR, name)
    with open(filepath) as fh:
        text = fh.read()
        template = string.Template(text)
        return template.substitute(params)


def get_class_name(name, postfix=''):
    name = identifier(name)
    return ''.join(map(capitalize, name.split('_'))) + postfix