# Licensed 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json
import logging

from django.core import urlresolvers
from django.utils.translation import ugettext_lazy as _

from horizon import exceptions
from horizon import forms
from horizon.forms import fields
from horizon import workflows

from openstack_dashboard.dashboards.project.data_processing \
    .utils import helpers
from openstack_dashboard.api import sahara as saharaclient


LOG = logging.getLogger(__name__)

JOB_BINARY_CREATE_URL = ("horizon:project:data_processing.job_binaries"
                         ":create-job-binary")


class AdditionalLibsAction(workflows.Action):
    lib_binaries = forms.DynamicChoiceField(
        label=_("Choose libraries"),
        required=False,
        add_item_link=JOB_BINARY_CREATE_URL)

    lib_ids = forms.CharField(
        required=False,
        widget=forms.HiddenInput())

    def populate_lib_binaries_choices(self, request, context):
        job_binaries = saharaclient.job_binary_list(request)

        choices = [(job_binary.id, job_binary.name)
                   for job_binary in job_binaries]
        choices.insert(0, ('', _("-- not selected --")))

        return choices

    class Meta(object):
        name = _("Libs")
        help_text_template = (
            "project/data_processing.jobs/_create_job_libs_help.html")


class GeneralConfigAction(workflows.Action):
    job_name = forms.CharField(label=_("Name"))

    job_type = forms.ChoiceField(label=_("Job Type"),
                                 widget=forms.Select(attrs={
                                     'class': 'switchable',
                                     'data-slug': 'jobtype'
                                 }))

    main_binary = forms.DynamicChoiceField(
        label=_("Choose a main binary"),
        required=False,
        help_text=_("Choose the binary which "
                    "should be used in this Job."),
        add_item_link=JOB_BINARY_CREATE_URL,
        widget=fields.DynamicSelectWidget(
            attrs={
                'class': 'switched',
                'data-switch-on': 'jobtype',
                'data-jobtype-pig': _("Choose a main binary"),
                'data-jobtype-hive': _("Choose a main binary"),
                'data-jobtype-spark': _("Choose a main binary"),
                'data-jobtype-mapreduce.streaming': _("Choose a main binary")
            }))

    job_description = forms.CharField(label=_("Description"),
                                      required=False,
                                      widget=forms.Textarea(attrs={'rows': 4}))

    def __init__(self, request, context, *args, **kwargs):
        super(GeneralConfigAction,
              self).__init__(request, context, *args, **kwargs)
        resolver_match = urlresolvers.resolve(request.path)
        if "guide_job_type" in resolver_match.kwargs:
            self.fields["job_type"].initial = (
                resolver_match.kwargs["guide_job_type"].lower())

    def populate_job_type_choices(self, request, context):
        choices = [("pig", _("Pig")), ("hive", _("Hive")),
                   ("spark", _("Spark")),
                   ("mapreduce", _("MapReduce")),
                   ("mapreduce.streaming", _("Streaming MapReduce")),
                   ("java", _("Java Action"))]
        return choices

    def populate_main_binary_choices(self, request, context):
        job_binaries = saharaclient.job_binary_list(request)

        choices = [(job_binary.id, job_binary.name)
                   for job_binary in job_binaries]
        choices.insert(0, ('', _("-- not selected --")))
        return choices

    def clean(self):
        cleaned_data = super(workflows.Action, self).clean()
        job_type = cleaned_data.get("job_type", "")

        if job_type in ["Java", "MapReduce"]:
            cleaned_data['main_binary'] = None

        return cleaned_data

    class Meta(object):
        name = _("Create Job Template")
        help_text_template = (
            "project/data_processing.jobs/_create_job_help.html")


class GeneralConfig(workflows.Step):
    action_class = GeneralConfigAction
    contributes = ("job_name", "job_type", "job_description", "main_binary")

    def contribute(self, data, context):
        for k, v in data.items():
            if k == "job_type":
                context[k] = helpers.JOB_TYPE_MAP[v][1]
            else:
                context[k] = v
        return context


class ConfigureLibs(workflows.Step):
    action_class = AdditionalLibsAction
    template_name = "project/data_processing.jobs/library_template.html"

    def contribute(self, data, context):
        chosen_libs = json.loads(data.get("lib_ids", '[]'))
        for k in xrange(len(chosen_libs)):
            context["lib_" + str(k)] = chosen_libs[k]
        return context


class CreateJob(workflows.Workflow):
    slug = "create_job"
    name = _("Create Job Template")
    finalize_button_name = _("Create")
    success_message = _("Job created")
    failure_message = _("Could not create job template")
    success_url = "horizon:project:data_processing.jobs:index"
    default_steps = (GeneralConfig, ConfigureLibs)

    def handle(self, request, context):
        main_locations = []
        lib_locations = []

        for k in context.keys():
            if k.startswith('lib_'):
                lib_locations.append(context.get(k))

        if context.get("main_binary", None):
            main_locations.append(context["main_binary"])

        try:
            job = saharaclient.job_create(
                request,
                context["job_name"],
                context["job_type"],
                main_locations,
                lib_locations,
                context["job_description"])

            hlps = helpers.Helpers(request)
            if hlps.is_from_guide():
                request.session["guide_job_id"] = job.id
                request.session["guide_job_type"] = context["job_type"]
                request.session["guide_job_name"] = context["job_name"]
                self.success_url = (
                    "horizon:project:data_processing.wizard:jobex_guide")
            return True
        except Exception:
            exceptions.handle(request)
            return False
