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"""
Bindings for the HMC Sign Text.
"""
from typing import List, Mapping

from google.protobuf.message import Message
from here.content.base import ContentPartition
from here.content.content import hmc_schema_version
from here.content.hmc2.baseattributes import Attribute, BaseAttributesBinding, SegmentAnchor
from here.content.utils.proto import decode_message

[docs]
class SignText(BaseAttributesBinding):
"""
Bindings for the HMC Sign Text.
"""

[docs]
@classmethod
def schema_hrn(cls) -> List[str]:
"""
:return: the HRN of schema this binding can parse and index
"""
return [f"hrn:here:schema:::com.here.schema.rib:sign-attributes_v2:{hmc_schema_version}"]

[docs]
@classmethod
def object_types(cls) -> Mapping[str, type]:
"""
:return: the types of attributes supported by this binding
"""
return {"sign_attribute": Attribute}

[docs]
@classmethod
def parse_and_index(cls, partition_id: str, msg: Message) -> ContentPartition:
"""
Parse and index decoded message.

:param partition_id: identifier of the partition
:param msg: decoded content from the layer, in the form of a Protobuf message
:return: the content of a partition parsed and indexed in its own data structure
"""
assert hasattr(msg, "segment_anchor")

def parse_generic_attributes(segment_anchors: List[_SegmentAnchor], msg):
for attribute_msg in msg:
a_value = decode_message(
attribute_msg, ignore=["originating_segment_anchor_index"]
)
sa = segment_anchors[attribute_msg.originating_segment_anchor_index]

for destination in a_value["destination"]:
destination_segment_anchor_index = destination[
"destination_segment_anchor_index"
]
destination_segments = segment_anchors[
destination_segment_anchor_index
].segments
destination["segments"] = destination_segments

in case the anchor is malformed and doesn't contain any reference

if not sa.segments:
continue
yield Attribute(
segments=sa.segments,
forward=sa.orientation in (1, 2),
backward=sa.orientation in (1, 3),
attribute=a_value,
)

parse segment anchors

segment_anchors = [
cls._parse_segment_anchor(sa) for sa in msg.segment_anchor # type: ignore
]

segment_attributes = {
attribute_type: list(
parse_generic_attributes(segment_anchors, getattr(msg, attribute_type))
)
for attribute_type in cls.object_types()

the following is to avoid parsing attributes that are empty

if hasattr(msg, attribute_type) and getattr(msg, attribute_type)
}

return ContentPartition(cls, **segment_attributes)