from flask import request

from endpoints.api import (resource, nickname, ApiResource, validate_json_request, request_error,
                           log_action, Unauthorized, NotFound, internal_only, path_param,
                           require_scope)
from auth.permissions import AdministerOrganizationPermission
from auth.auth_context import get_authenticated_user
from auth import scopes
from data import model


def prototype_view(proto, org_members):
  def prototype_user_view(user):
    return {
      'name': user.username,
      'is_robot': user.robot,
      'kind': 'user',
      'is_org_member': user.robot or user.username in org_members,
    }

  if proto.delegate_user:
    delegate_view = prototype_user_view(proto.delegate_user)
  else:
    delegate_view = {
      'name': proto.delegate_team.name,
      'kind': 'team',
    }

  return {
    'activating_user': (prototype_user_view(proto.activating_user)
                        if proto.activating_user else None),
    'delegate': delegate_view,
    'role': proto.role.name,
    'id': proto.uuid,
  }

def log_prototype_action(action_kind, orgname, prototype, **kwargs):
  username = get_authenticated_user().username
  log_params = {
    'prototypeid': prototype.uuid,
    'username': username,
    'activating_username': (prototype.activating_user.username
                            if prototype.activating_user else None),
    'role': prototype.role.name
  }

  for key, value in kwargs.items():
    log_params[key] = value

  if prototype.delegate_user:
    log_params['delegate_user'] = prototype.delegate_user.username
  elif prototype.delegate_team:
    log_params['delegate_team'] = prototype.delegate_team.name

  log_action(action_kind, orgname, log_params)


@resource('/v1/organization/<orgname>/prototypes')
@path_param('orgname', 'The name of the organization')
class PermissionPrototypeList(ApiResource):
  """ Resource for listing and creating permission prototypes. """
  schemas = {
    'NewPrototype': {
      'id': 'NewPrototype',
      'type': 'object',
      'description': 'Description of a new prototype',
      'required': [
        'role',
        'delegate',
      ],
      'properties': {
        'role': {
          'type': 'string',
          'description': 'Role that should be applied to the delegate',
          'enum': [
            'read',
            'write',
            'admin',
          ],
        },
        'activating_user': {
          'type': 'object',
          'description': 'Repository creating user to whom the rule should apply',
          'required': [
            'name',
          ],
          'properties': {
            'name': {
              'type': 'string',
              'description': 'The username for the activating_user',
            },
          },
        },
        'delegate': {
          'type': 'object',
          'description': 'Information about the user or team to which the rule grants access',
          'required': [
            'name',
            'kind',
          ],
          'properties': {
            'name': {
              'type': 'string',
              'description': 'The name for the delegate team or user',
            },
            'kind': {
              'type': 'string',
              'description': 'Whether the delegate is a user or a team',
              'enum': [
                'user',
                'team',
              ],
            },
          },
        },
      },
    },
  }

  @require_scope(scopes.ORG_ADMIN)
  @nickname('getOrganizationPrototypePermissions')
  def get(self, orgname):
    """ List the existing prototypes for this organization. """
    permission = AdministerOrganizationPermission(orgname)
    if permission.can():
      try:
        org = model.get_organization(orgname)
      except model.InvalidOrganizationException:
        raise NotFound()

      permissions = model.get_prototype_permissions(org)
      org_members = model.get_organization_member_set(orgname)
      return {'prototypes': [prototype_view(p, org_members)  for p in permissions]}

    raise Unauthorized()

  @require_scope(scopes.ORG_ADMIN)
  @nickname('createOrganizationPrototypePermission')
  @validate_json_request('NewPrototype')
  def post(self, orgname):
    """ Create a new permission prototype. """
    permission = AdministerOrganizationPermission(orgname)
    if permission.can():
      try:
        org = model.get_organization(orgname)
      except model.InvalidOrganizationException:
        raise NotFound()

      details = request.get_json()
      activating_username = None

      if ('activating_user' in details and details['activating_user'] and
          'name' in details['activating_user']):
        activating_username = details['activating_user']['name']

      delegate = details['delegate'] if 'delegate' in details else {}
      delegate_kind = delegate.get('kind', None)
      delegate_name = delegate.get('name', None)

      delegate_username = delegate_name if delegate_kind == 'user' else None
      delegate_teamname = delegate_name if delegate_kind == 'team' else None

      activating_user = (model.get_user(activating_username) if activating_username else None)
      delegate_user = (model.get_user(delegate_username) if delegate_username else None)
      delegate_team = (model.get_organization_team(orgname, delegate_teamname)
                       if delegate_teamname else None)

      if activating_username and not activating_user:
        raise request_error(message='Unknown activating user')

      if not delegate_user and not delegate_team:
        raise request_error(message='Missing delegate user or team')

      role_name = details['role']

      prototype = model.add_prototype_permission(org, role_name, activating_user,
                                                 delegate_user, delegate_team)
      log_prototype_action('create_prototype_permission', orgname, prototype)
      org_members = model.get_organization_member_set(orgname)
      return prototype_view(prototype, org_members)

    raise Unauthorized()


@resource('/v1/organization/<orgname>/prototypes/<prototypeid>')
@path_param('orgname', 'The name of the organization')
@path_param('prototypeid', 'The ID of the prototype')
class PermissionPrototype(ApiResource):
  """ Resource for managingin individual permission prototypes. """
  schemas = {
    'PrototypeUpdate': {
      'id': 'PrototypeUpdate',
      'type': 'object',
      'description': 'Description of a the new prototype role',
      'required': [
        'role',
      ],
      'properties': {
        'role': {
          'type': 'string',
          'description': 'Role that should be applied to the permission',
          'enum': [
            'read',
            'write',
            'admin',
          ],
        },
      },
    },
  }

  @require_scope(scopes.ORG_ADMIN)
  @nickname('deleteOrganizationPrototypePermission')
  def delete(self, orgname, prototypeid):
    """ Delete an existing permission prototype. """
    permission = AdministerOrganizationPermission(orgname)
    if permission.can():
      try:
        org = model.get_organization(orgname)
      except model.InvalidOrganizationException:
        raise NotFound()

      prototype = model.delete_prototype_permission(org, prototypeid)
      if not prototype:
        raise NotFound()

      log_prototype_action('delete_prototype_permission', orgname, prototype)

      return 'Deleted', 204

    raise Unauthorized()

  @require_scope(scopes.ORG_ADMIN)
  @nickname('updateOrganizationPrototypePermission')
  @validate_json_request('PrototypeUpdate')
  def put(self, orgname, prototypeid):
    """ Update the role of an existing permission prototype. """
    permission = AdministerOrganizationPermission(orgname)
    if permission.can():
      try:
        org = model.get_organization(orgname)
      except model.InvalidOrganizationException:
        raise NotFound()

      existing = model.get_prototype_permission(org, prototypeid)
      if not existing:
        raise NotFound()

      details = request.get_json()
      role_name = details['role']
      prototype = model.update_prototype_permission(org, prototypeid, role_name)
      if not prototype:
        raise NotFound()

      log_prototype_action('modify_prototype_permission', orgname, prototype,
                           original_role=existing.role.name)
      org_members = model.get_organization_member_set(orgname)
      return prototype_view(prototype, org_members)

    raise Unauthorized()