text: # Copyright 2016 OpenMarket Ltd
  #
  # 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 copy
  from typing import Any, Dict, List, Optional
  
  from synapse.push.rulekinds import PRIORITY_CLASS_INVERSE_MAP, PRIORITY_CLASS_MAP
  from synapse.types import UserID
  
  
  def format_push_rules_for_user(user: UserID, ruleslist) -> Dict[str, Dict[str, list]]:
      """Converts a list of rawrules and a enabled map into nested dictionaries
      to match the Matrix client-server format for push rules"""
  
      # We're going to be mutating this a lot, so do a deep copy
      ruleslist = copy.deepcopy(ruleslist)
  
      rules = {
          "global": {},
          "device": {},
      }  # type: Dict[str, Dict[str, List[Dict[str, Any]]]]
  
      rules["global"] = _add_empty_priority_class_arrays(rules["global"])
  
      for r in ruleslist:
          template_name = _priority_class_to_template_name(r["priority_class"])
  
          # Remove internal stuff.
          for c in r["conditions"]:
              c.pop("_id", None)
  
              pattern_type = c.pop("pattern_type", None)
              if pattern_type == "user_id":
                  c["pattern"] = user.to_string()
              elif pattern_type == "user_localpart":
                  c["pattern"] = user.localpart
  
          rulearray = rules["global"][template_name]
  
          template_rule = _rule_to_template(r)
          if template_rule:
              if "enabled" in r:
                  template_rule["enabled"] = r["enabled"]
              else:
                  template_rule["enabled"] = True
              rulearray.append(template_rule)
  
      return rules
  
  
  def _add_empty_priority_class_arrays(d: Dict[str, list]) -> Dict[str, list]:
      for pc in PRIORITY_CLASS_MAP.keys():
          d[pc] = []
      return d
  
  
  def _rule_to_template(rule: Dict[str, Any]) -> Optional[Dict[str, Any]]:
      unscoped_rule_id = None
      if "rule_id" in rule:
          unscoped_rule_id = _rule_id_from_namespaced(rule["rule_id"])
  
      template_name = _priority_class_to_template_name(rule["priority_class"])
      if template_name in ["override", "underride"]:
          templaterule = {k: rule[k] for k in ["conditions", "actions"]}
      elif template_name in ["sender", "room"]:
          templaterule = {"actions": rule["actions"]}
          unscoped_rule_id = rule["conditions"][0]["pattern"]
      elif template_name == "content":
          if len(rule["conditions"]) != 1:
              return None
          thecond = rule["conditions"][0]
          if "pattern" not in thecond:
              return None
          templaterule = {"actions": rule["actions"]}
          templaterule["pattern"] = thecond["pattern"]
      else:
          # This should not be reached unless this function is not kept in sync
          # with PRIORITY_CLASS_INVERSE_MAP.
          raise ValueError("Unexpected template_name: %s" % (template_name,))
  
      if unscoped_rule_id:
          templaterule["rule_id"] = unscoped_rule_id
      if "default" in rule:
          templaterule["default"] = rule["default"]
      return templaterule
  
  
  def _rule_id_from_namespaced(in_rule_id: str) -> str:
      return in_rule_id.split("/")[-1]
  
  
  def _priority_class_to_template_name(pc: int) -> str:
      return PRIORITY_CLASS_INVERSE_MAP[pc]
  