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#
# BitBake Toaster Implementation
#
# Copyright (C) 2016        Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


# Temporary home for the UI's misc API
import re

from orm.models import Project, ProjectTarget, Build, Layer_Version
from orm.models import LayerVersionDependency, LayerSource, ProjectLayer
from bldcontrol.models import BuildRequest
from bldcontrol import bbcontroller
from django.http import HttpResponse, JsonResponse
from django.views.generic import View
from django.core.urlresolvers import reverse
from django.core import serializers
from django.utils import timezone
from django.template.defaultfilters import date
from toastergui.templatetags.projecttags import json, sectohms, get_tasks

def error_response(error):
    return JsonResponse({"error": error})


class XhrBuildRequest(View):

    def get(self, request, *args, **kwargs):
        return HttpResponse()

    def post(self, request, *args, **kwargs):
        """
          Build control

          Entry point: /xhr_buildrequest/<project_id>
          Method: POST

          Args:
              id: id of build to change
              buildCancel = build_request_id ...
              buildDelete = id ...
              targets = recipe_name ...

          Returns:
              {"error": "ok"}
            or
              {"error": <error message>}
        """

        project = Project.objects.get(pk=kwargs['pid'])

        if 'buildCancel' in request.POST:
            for i in request.POST['buildCancel'].strip().split(" "):
                try:
                    br = BuildRequest.objects.get(project=project, pk=i)

                    try:
                        bbctrl = bbcontroller.BitbakeController(br.environment)
                        bbctrl.forceShutDown()
                    except:
                        # We catch a bunch of exceptions here because
                        # this is where the server has not had time to start up
                        # and the build request or build is in transit between
                        # processes.
                        # We can safely just set the build as cancelled
                        # already as it never got started
                        build = br.build
                        build.outcome = Build.CANCELLED
                        build.save()

                    # We now hand over to the buildinfohelper to update the
                    # build state once we've finished cancelling
                    br.state = BuildRequest.REQ_CANCELLING
                    br.save()

                except BuildRequest.DoesNotExist:
                    return error_response('No such build request id %s' % i)

            return error_response('ok')

        if 'buildDelete' in request.POST:
            for i in request.POST['buildDelete'].strip().split(" "):
                try:
                    BuildRequest.objects.select_for_update().get(
                        project=project,
                        pk=i,
                        state__lte=BuildRequest.REQ_DELETED).delete()

                except BuildRequest.DoesNotExist:
                    pass
            return error_response("ok")

        if 'targets' in request.POST:
            ProjectTarget.objects.filter(project=project).delete()
            s = str(request.POST['targets'])
            for t in re.sub(r'[;%|"]', '', s).split(" "):
                if ":" in t:
                    target, task = t.split(":")
                else:
                    target = t
                    task = ""
                ProjectTarget.objects.create(project=project,
                                             target=target,
                                             task=task)
            project.schedule_build()

            return error_response('ok')

        response = HttpResponse()
        response.status_code = 500
        return response


class XhrLayer(View):
    """ Get and Update Layer information """

    def post(self, request, *args, **kwargs):
        """
          Update a layer

          Entry point: /xhr_layer/<layerversion_id>
          Method: POST

          Args:
              vcs_url, dirpath, commit, up_branch, summary, description

              add_dep = append a layerversion_id as a dependency
              rm_dep = remove a layerversion_id as a depedency
          Returns:
              {"error": "ok"}
            or
              {"error": <error message>}
        """

        try:
            # We currently only allow Imported layers to be edited
            layer_version = Layer_Version.objects.get(
                id=kwargs['layerversion_id'],
                project=kwargs['pid'],
                layer_source=LayerSource.TYPE_IMPORTED)

        except Layer_Version.DoesNotExist:
            return error_response("Cannot find imported layer to update")

        if "vcs_url" in request.POST:
            layer_version.layer.vcs_url = request.POST["vcs_url"]
        if "dirpath" in request.POST:
            layer_version.dirpath = request.POST["dirpath"]
        if "commit" in request.POST:
            layer_version.commit = request.POST["commit"]
            layer_version.branch = request.POST["commit"]
        if "summary" in request.POST:
            layer_version.layer.summary = request.POST["summary"]
        if "description" in request.POST:
            layer_version.layer.description = request.POST["description"]

        if "add_dep" in request.POST:
            lvd = LayerVersionDependency(
                layer_version=layer_version,
                depends_on_id=request.POST["add_dep"])
            lvd.save()

        if "rm_dep" in request.POST:
            rm_dep = LayerVersionDependency.objects.get(
                layer_version=layer_version,
                depends_on_id=request.POST["rm_dep"])
            rm_dep.delete()

        try:
            layer_version.layer.save()
            layer_version.save()
        except Exception as e:
            return error_response("Could not update layer version entry: %s"
                                  % e)

        return JsonResponse({"error": "ok"})

    def delete(self, request, *args, **kwargs):
        try:
            # We currently only allow Imported layers to be deleted
            layer_version = Layer_Version.objects.get(
                id=kwargs['layerversion_id'],
                project=kwargs['pid'],
                layer_source=LayerSource.TYPE_IMPORTED)
        except Layer_Version.DoesNotExist:
            return error_response("Cannot find imported layer to delete")

        try:
            ProjectLayer.objects.get(project=kwargs['pid'],
                                     layercommit=layer_version).delete()
        except ProjectLayer.DoesNotExist:
            pass

        layer_version.layer.delete()
        layer_version.delete()

        return JsonResponse({
            "error": "ok",
            "redirect": reverse('project', args=(kwargs['pid'],))
        })

class MostRecentBuildsView(View):
    def _was_yesterday_or_earlier(self, completed_on):
        now = timezone.now()
        delta = now - completed_on

        if delta.days >= 1:
            return True

        return False

    def get(self, request, *args, **kwargs):
        """
        Returns a list of builds in JSON format.
        """
        mrb_type = 'all'
        project = None

        project_id = request.GET.get('project_id', None)
        if project_id:
            try:
                mrb_type = 'project'
                project = Project.objects.get(pk=project_id)
            except:
                # if project lookup fails, assume no project
                pass

        recent_build_objs = Build.get_recent(project)
        recent_builds = []

        # for timezone conversion
        tz = timezone.get_current_timezone()

        for build_obj in recent_build_objs:
            dashboard_url = reverse('builddashboard', args=(build_obj.pk,))
            buildtime_url = reverse('buildtime', args=(build_obj.pk,))
            rebuild_url = \
                reverse('xhr_buildrequest', args=(build_obj.project.pk,))
            cancel_url = \
                reverse('xhr_buildrequest', args=(build_obj.project.pk,))

            build = {}
            build['id'] = build_obj.pk
            build['dashboard_url'] = dashboard_url

            buildrequest_id = None
            if hasattr(build_obj, 'buildrequest'):
                buildrequest_id = build_obj.buildrequest.pk
            build['buildrequest_id'] = buildrequest_id

            build['recipes_parsed_percentage'] = \
                int((build_obj.recipes_parsed / build_obj.recipes_to_parse) * 100)

            tasks_complete_percentage = 0
            if build_obj.outcome in (Build.SUCCEEDED, Build.FAILED):
                tasks_complete_percentage = 100
            elif build_obj.outcome == Build.IN_PROGRESS:
                tasks_complete_percentage = build_obj.completeper()
            build['tasks_complete_percentage'] = tasks_complete_percentage

            build['state'] = build_obj.get_state()

            build['errors'] = build_obj.errors.count()
            build['dashboard_errors_url'] = dashboard_url + '#errors'

            build['warnings'] = build_obj.warnings.count()
            build['dashboard_warnings_url'] = dashboard_url + '#warnings'

            build['buildtime'] = sectohms(build_obj.timespent_seconds)
            build['buildtime_url'] = buildtime_url

            build['rebuild_url'] = rebuild_url
            build['cancel_url'] = cancel_url

            build['is_default_project_build'] = build_obj.project.is_default

            build['build_targets_json'] = \
                json(get_tasks(build_obj.target_set.all()))

            # convert completed_on time to user's timezone
            completed_on = timezone.localtime(build_obj.completed_on)

            completed_on_template = '%H:%M'
            if self._was_yesterday_or_earlier(completed_on):
                completed_on_template = '%d/%m/%Y ' + completed_on_template
            build['completed_on'] = completed_on.strftime(completed_on_template)

            targets = []
            target_objs = build_obj.get_sorted_target_list()
            for target_obj in target_objs:
                if target_obj.task:
                    targets.append(target_obj.target + ':' + target_obj.task)
                else:
                    targets.append(target_obj.target)
            build['targets'] = ' '.join(targets)

            # abbreviated form of the full target list
            abbreviated_targets = ''
            num_targets = len(targets)
            if num_targets > 0:
                abbreviated_targets = targets[0]
            if num_targets > 1:
                abbreviated_targets += (' +%s' % (num_targets - 1))
            build['targets_abbreviated'] = abbreviated_targets

            recent_builds.append(build)

        return JsonResponse(recent_builds, safe=False)