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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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# distributed under the License is distributed on an "AS IS" BASIS,
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"""
CLI ``services`` sub-commands.
"""

import os
from StringIO import StringIO

from . import service_templates
from .. import helptexts
from .. import table
from .. import utils
from ..core import aria
from ...core import Core
from ...modeling import exceptions as modeling_exceptions
from ...storage import exceptions as storage_exceptions
from ...parser import consumption
from ...utils import (formatting, collections, console)
from ...orchestrator import topology


DESCRIPTION_FIELD_LENGTH_LIMIT = 20
SERVICE_COLUMNS = ('id', 'name', 'description', 'service_template_name', 'created_at', 'updated_at')


@aria.group(name='services')
@aria.options.verbose()
def services():
    """
    Manage services
    """
    pass


@services.command(name='show',
                  short_help='Show information for a service')
@aria.argument('service-name')
@aria.options.verbose()
@aria.options.service_mode_full
@aria.options.mode_graph
@aria.options.format_json
@aria.options.format_yaml
@aria.pass_model_storage
@aria.pass_logger
def show(service_name, model_storage, mode_full, mode_graph, format_json, format_yaml, logger):
    """
    Show information for a service

    SERVICE_NAME is the unique name of the service.
    """
    service = model_storage.service.get_by_name(service_name)

    if format_json or format_yaml:
        mode_full = True

    if mode_full:
        consumption.ConsumptionContext()
        if format_json:
            console.puts(formatting.json_dumps(collections.prune(service.as_raw)))
        elif format_yaml:
            console.puts(formatting.yaml_dumps(collections.prune(service.as_raw)))
        else:
            console.puts(topology.Topology().dump(service))
    elif mode_graph:
        console.puts(topology.Topology().dump_graph(service))
    else:
        logger.info('Showing service {0}...'.format(service_name))
        service_dict = service.to_dict()
        columns = SERVICE_COLUMNS
        column_formatters = \
            dict(description=table.trim_formatter_generator(DESCRIPTION_FIELD_LENGTH_LIMIT))
        table.print_data(columns, service_dict, 'Service:',
                         column_formatters=column_formatters, col_max_width=50)

        if service_dict['description'] is not None:
            logger.info('Description:')
            logger.info('{0}{1}'.format(service_dict['description'].encode('UTF-8') or '',
                                        os.linesep))


@services.command(name='list', short_help='List services')
@aria.options.service_template_name()
@aria.options.sort_by()
@aria.options.descending
@aria.options.verbose()
@aria.pass_model_storage
@aria.pass_logger
def list(service_template_name,
         sort_by,
         descending,
         model_storage,
         logger):
    """
    List services

    If `--service-template-name` is provided, list services based on that service template.
    Otherwise, list all services.
    """
    if service_template_name:
        logger.info('Listing services for service template {0}...'.format(
            service_template_name))
        service_template = model_storage.service_template.get_by_name(service_template_name)
        filters = dict(service_template=service_template)
    else:
        logger.info('Listing all services...')
        filters = {}

    services_list = model_storage.service.list(
        sort=utils.storage_sort_param(sort_by=sort_by, descending=descending),
        filters=filters)
    table.print_data(SERVICE_COLUMNS, services_list, 'Services:')


@services.command(name='create',
                  short_help='Create a service')
@aria.argument('service-name', required=False)
@aria.options.service_template_name(required=True)
@aria.options.inputs(help=helptexts.SERVICE_INPUTS)
@aria.options.verbose()
@aria.pass_model_storage
@aria.pass_resource_storage
@aria.pass_plugin_manager
@aria.pass_logger
def create(service_template_name,
           service_name,
           inputs,  # pylint: disable=redefined-outer-name
           model_storage,
           resource_storage,
           plugin_manager,
           logger):
    """
    Create a service

    SERVICE_NAME is the unique name to give to the service.
    """
    logger.info('Creating new service from service template {0}...'.format(
        service_template_name))
    core = Core(model_storage, resource_storage, plugin_manager)
    service_template = model_storage.service_template.get_by_name(service_template_name)

    try:
        service = core.create_service(service_template.id, inputs, service_name)
    except storage_exceptions.StorageError as e:
        utils.check_overriding_storage_exceptions(e, 'service', service_name)
        raise
    except modeling_exceptions.ParameterException:
        service_templates.print_service_template_inputs(model_storage, service_template_name,
                                                        logger)
        raise
    logger.info("Service created. The service's name is {0}".format(service.name))


@services.command(name='delete',
                  short_help='Delete a service')
@aria.argument('service-name')
@aria.options.force(help=helptexts.IGNORE_AVAILABLE_NODES)
@aria.options.verbose()
@aria.pass_model_storage
@aria.pass_resource_storage
@aria.pass_plugin_manager
@aria.pass_logger
def delete(service_name, force, model_storage, resource_storage, plugin_manager, logger):
    """
    Delete a service

    SERVICE_NAME is the unique name of the service.
    """
    logger.info('Deleting service {0}...'.format(service_name))
    service = model_storage.service.get_by_name(service_name)
    core = Core(model_storage, resource_storage, plugin_manager)
    core.delete_service(service.id, force=force)
    logger.info('Service {0} deleted'.format(service_name))


@services.command(name='outputs',
                  short_help='Show service outputs')
@aria.argument('service-name')
@aria.options.verbose()
@aria.pass_model_storage
@aria.pass_logger
def outputs(service_name, model_storage, logger):
    """
    Show service outputs

    SERVICE_NAME is the unique name of the service.
    """
    logger.info('Showing outputs for service {0}...'.format(service_name))
    service = model_storage.service.get_by_name(service_name)

    if service.outputs:
        outputs_string = StringIO()
        for output_name, output in service.outputs.iteritems():
            outputs_string.write(' - "{0}":{1}'.format(output_name, os.linesep))
            outputs_string.write('     Description: {0}{1}'.format(output.description, os.linesep))
            outputs_string.write('     Value: {0}{1}'.format(output.value, os.linesep))
        logger.info(outputs_string.getvalue())
    else:
        logger.info('\tNo outputs')


@services.command(name='inputs',
                  short_help='Show service inputs')
@aria.argument('service-name')
@aria.options.verbose()
@aria.pass_model_storage
@aria.pass_logger
def inputs(service_name, model_storage, logger):
    """
    Show service inputs

    SERVICE_NAME is the unique name of the service.
    """
    logger.info('Showing inputs for service {0}...'.format(service_name))
    service = model_storage.service.get_by_name(service_name)

    if service.inputs:
        inputs_string = StringIO()
        for input_name, input_ in service.inputs.iteritems():
            inputs_string.write(' - "{0}":{1}'.format(input_name, os.linesep))
            inputs_string.write('     Description: {0}{1}'.format(input_.description, os.linesep))
            inputs_string.write('     Value: {0}{1}'.format(input_.value, os.linesep))
        logger.info(inputs_string.getvalue())
    else:
        logger.info('\tNo inputs')