# Copyright 2018 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd

from __future__ import print_function
from __future__ import division
from __future__ import absolute_import

import logging

import settings

from api import monorail_servicer
from api import converters
from api.api_proto import projects_pb2
from api.api_proto import project_objects_pb2
from api.api_proto import projects_prpc_pb2
from businesslogic import work_env
from framework import framework_bizobj
from framework import exceptions
from framework import framework_views
from framework import permissions
from project import project_helpers
from tracker import tracker_bizobj
from tracker import tracker_helpers

# TODO(zhangtiff): Remove dependency on tracker_views.
from tracker import tracker_views


class ProjectsServicer(monorail_servicer.MonorailServicer):
  """Handle API requests related to Project objects.

  Each API request is implemented with a method as defined in the .proto
  file that does any request-specific validation, uses work_env to
  safely operate on business objects, and returns a response proto.
  """

  DESCRIPTION = projects_prpc_pb2.ProjectsServiceDescription

  def _GetProject(self, mc, request, use_cache=True):
    """Get the project object specified in the request."""
    with work_env.WorkEnv(mc, self.services, phase='getting project') as we:
      project = we.GetProjectByName(request.project_name, use_cache=use_cache)
      # Perms in this project are already looked up in MonorailServicer.
    return project

  @monorail_servicer.PRPCMethod
  def ListProjects(self, _mc, _request):
    return projects_pb2.ListProjectsResponse(
        projects=[
            project_objects_pb2.Project(name='One'),
            project_objects_pb2.Project(name='Two')],
        next_page_token='next...')

  @monorail_servicer.PRPCMethod
  def ListProjectTemplates(self, mc, request):
    """Return the specific project's templates."""
    if not request.project_name:
      raise exceptions.InputException('Param `project_name` required.')
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)
      templates = we.ListProjectTemplates(project.project_id)

    with mc.profiler.Phase('converting to response objects'):
      involved_user_ids = tracker_bizobj.UsersInvolvedInTemplates(templates)
      users_by_id = framework_views.MakeAllUserViews(
          mc.cnxn, self.services.user, involved_user_ids)
      response = projects_pb2.ListProjectTemplatesResponse(
          templates=converters.ConvertProjectTemplateDefs(
              templates, users_by_id, config))

    return response

  @monorail_servicer.PRPCMethod
  def GetConfig(self, mc, request):
    """Return the specified project config."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    with mc.profiler.Phase('making user views'):
      involved_user_ids = tracker_bizobj.UsersInvolvedInConfig(config)
      users_by_id = framework_views.MakeAllUserViews(
          mc.cnxn, self.services.user, involved_user_ids)
      framework_views.RevealAllEmailsToMembers(
          mc.cnxn, self.services, mc.auth, users_by_id, project)

      label_ids = tracker_bizobj.LabelIDsInvolvedInConfig(config)
      labels_by_id = {
        label_id: self.services.config.LookupLabel(
            mc.cnxn, config.project_id, label_id)
        for label_id in label_ids}

    result = converters.ConvertConfig(
        project, config, users_by_id, labels_by_id)
    return result

  @monorail_servicer.PRPCMethod
  def GetPresentationConfig(self, mc, request):
    """Return the UI centric pieces of the project config."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    project_thumbnail_url = tracker_views.LogoView(project).thumbnail_url
    project_summary = project.summary
    custom_issue_entry_url = config.custom_issue_entry_url
    revision_url_format = (
        project.revision_url_format or settings.revision_url_format)

    default_query = None
    saved_queries = None

    # Only show default query or project saved queries for project
    # members, in case they contain sensitive information.
    if framework_bizobj.UserIsInProject(
        project, mc.auth.effective_ids):
      default_query = config.member_default_query

      saved_queries = self.services.features.GetCannedQueriesByProjectID(
          mc.cnxn, project.project_id)

    return project_objects_pb2.PresentationConfig(
        project_thumbnail_url=project_thumbnail_url,
        project_summary=project_summary,
        custom_issue_entry_url=custom_issue_entry_url,
        default_query=default_query,
        default_col_spec=config.default_col_spec,
        default_sort_spec=config.default_sort_spec,
        default_x_attr=config.default_x_attr,
        default_y_attr=config.default_y_attr,
        saved_queries=converters.IngestSavedQueries(
            mc.cnxn, self.services.project, saved_queries),
        revision_url_format=revision_url_format)

  @monorail_servicer.PRPCMethod
  def GetCustomPermissions(self, mc, request):
    """Return the custom permissions for the given project."""
    project = self._GetProject(mc, request)
    custom_permissions = permissions.GetCustomPermissions(project)

    result = projects_pb2.GetCustomPermissionsResponse(
        permissions=custom_permissions)
    return result

  @monorail_servicer.PRPCMethod
  def GetVisibleMembers(self, mc, request):
    """Return the members of the project that the user can see.

    Raises:
      PermissionException the user is not allowed to view the project members.
    """
    project = self._GetProject(mc, request)
    if not permissions.CanViewContributorList(mc, project):
      raise permissions.PermissionException(
          'User is not allowed to view the project members')

    users_by_id = tracker_helpers.GetVisibleMembers(mc, project, self.services)

    sorted_user_ids = sorted(
        users_by_id, key=lambda uid: users_by_id[uid].email)
    user_refs = converters.ConvertUserRefs(
        sorted_user_ids, [], users_by_id, True)
    sorted_group_ids = sorted(
        (uv.user_id for uv in users_by_id.values() if uv.is_group),
        key=lambda uid: users_by_id[uid].email)
    group_refs = converters.ConvertUserRefs(
        sorted_group_ids, [], users_by_id, True)

    result = projects_pb2.GetVisibleMembersResponse(
        user_refs=user_refs, group_refs=group_refs)
    return result

  @monorail_servicer.PRPCMethod
  def GetLabelOptions(self, mc, request):
    """Return the label options for autocomplete for the given project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    label_options = tracker_helpers.GetLabelOptions(
        config, permissions.GetCustomPermissions(project))
    label_defs = [
        project_objects_pb2.LabelDef(
            label=label['name'],
            docstring=label['doc'])
        for label in label_options]

    result = projects_pb2.GetLabelOptionsResponse(
        label_options=label_defs,
        exclusive_label_prefixes=config.exclusive_label_prefixes)
    return result

  @monorail_servicer.PRPCMethod
  def ListStatuses(self, mc, request):
    """Return all well-known statuses in the specified project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    status_defs = [
        converters.ConvertStatusDef(sd)
        for sd in config.well_known_statuses]
    statuses_offer_merge = [
        converters.ConvertStatusRef(sd.status, None, config)
        for sd in config.well_known_statuses
        if sd.status in config.statuses_offer_merge]

    result = projects_pb2.ListStatusesResponse(
        status_defs=status_defs,
        statuses_offer_merge=statuses_offer_merge,
        restrict_to_known=config.restrict_to_known)
    return result

  @monorail_servicer.PRPCMethod
  def ListComponents(self, mc, request):
    """Return all component defs in the specified project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    with mc.profiler.Phase('making user views'):
      users_by_id = {}
      if request.include_admin_info:
        users_involved = tracker_bizobj.UsersInvolvedInConfig(config)
        users_by_id = framework_views.MakeAllUserViews(
            mc.cnxn, self.services.user, users_involved)
        framework_views.RevealAllEmailsToMembers(
            mc.cnxn, self.services, mc.auth, users_by_id, project)

    with mc.profiler.Phase('looking up labels'):
      labels_by_id = {}
      if request.include_admin_info:
        label_ids = tracker_bizobj.LabelIDsInvolvedInConfig(config)
        labels_by_id = {
          label_id: self.services.config.LookupLabel(
              mc.cnxn, config.project_id, label_id)
          for label_id in label_ids}

    component_defs = [
        converters.ConvertComponentDef(
            cd, users_by_id, labels_by_id, request.include_admin_info)
        for cd in config.component_defs]

    result = projects_pb2.ListComponentsResponse(
        component_defs=component_defs)
    return result

  @monorail_servicer.PRPCMethod
  def ListFields(self, mc, request):
    """List all fields for the specified project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      config = we.GetProjectConfig(project.project_id)

    users_by_id = {}
    users_for_perm = {}
    # Only look for members if user choices are requested and there are user
    # fields that need permissions.
    if request.include_user_choices:
      perms_needed = {
          fd.needs_perm
          for fd in config.field_defs
          if fd.needs_perm and not fd.is_deleted}
      if perms_needed:
        users_by_id = tracker_helpers.GetVisibleMembers(
            mc, project, self.services)
        effective_ids_by_user = self.services.usergroup.LookupAllMemberships(
            mc.cnxn, users_by_id)
        users_for_perm = project_helpers.UsersWithPermsInProject(
            project, perms_needed, users_by_id, effective_ids_by_user)

    field_defs = [
        converters.ConvertFieldDef(
            fd, users_for_perm.get(fd.needs_perm, []), users_by_id, config,
            request.include_admin_info)
        for fd in config.field_defs
        if not fd.is_deleted]

    result = projects_pb2.ListFieldsResponse(field_defs=field_defs)
    return result

  @monorail_servicer.PRPCMethod
  def GetProjectStarCount(self, mc, request):
    """Get the star count for the specified project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      star_count = we.GetProjectStarCount(project.project_id)

    result = projects_pb2.GetProjectStarCountResponse(star_count=star_count)
    return result

  @monorail_servicer.PRPCMethod
  def StarProject(self, mc, request):
    """Star the specified project."""
    project = self._GetProject(mc, request)

    with work_env.WorkEnv(mc, self.services) as we:
      we.StarProject(project.project_id, request.starred)
      star_count = we.GetProjectStarCount(project.project_id)

    result = projects_pb2.StarProjectResponse(star_count=star_count)
    return result

  @monorail_servicer.PRPCMethod
  def CheckProjectName(self, mc, request):
    """Check that a project name is valid and not already in use."""
    with work_env.WorkEnv(mc, self.services) as we:
      error = we.CheckProjectName(request.project_name)
    result = projects_pb2.CheckProjectNameResponse(error=error)
    return result

  @monorail_servicer.PRPCMethod
  def CheckComponentName(self, mc, request):
    """Check that the component name is valid and not already in use."""
    project = self._GetProject(mc, request)
    with work_env.WorkEnv(mc, self.services) as we:
      error = we.CheckComponentName(
          project.project_id, request.parent_path, request.component_name)
    result = projects_pb2.CheckComponentNameResponse(error=error)
    return result

  @monorail_servicer.PRPCMethod
  def CheckFieldName(self, mc, request):
    """Check that a field name is valid and not already in use."""
    project = self._GetProject(mc, request)
    with work_env.WorkEnv(mc, self.services) as we:
      error = we.CheckFieldName(project.project_id, request.field_name)
    result = projects_pb2.CheckFieldNameResponse(error=error)
    return result